bluuebunny/crossref_metadata_2025 huggingface dataset:
Endogenous Timing in Vertically-Related Markets
Authors: Din Hong-Ren , Sun Chia-Hung
Published: April 2018

This paper investigates the theory of endogenous timing by taking into account a vertically-related market where an integrated firm competes with a downstream firm. Contrary to the standard results in the literature, we find that both firms play a sequential game in quantity competition and play a simultaneous game in price competition. Under mixed quantity-price competition, the firm choosing a price strategy moves first and the other firm choosing a quantity strategy moves later in equilibrium. Given that the timing of choosing actions is determined endogenously, aggregate profit (consumer surplus) is higher (lower) under price competition than under quantity competition. Lastly, social welfare is higher under quantity competition than under price competition when the degree of product substitutability is relatively low.
Evaluation of activated composite membranes for the facilitated transport of phenol
Authors: Pérez-Silva Irma , Galán-Vidal Carlos A. , Ramírez-Silva María T. , Álvarez Romero Giaan A. , Páez-Hernández Ma. Elena
Published: April 2018

In this work the results on the first use of an activated composite membrane (ACM) containing Cyanex 923 for the extraction and transport of phenol are presented. A new dense layer-ACM configuration constituted by piperazine showed better stability than that prepared with 1,3-phenylenediamine. The effects of several parameters on the transport of phenol such as feed phase pH, carrier concentration and stripping phase composition were evaluated. The performance of the membrane was also evaluated during continuous additions of phenol and for a long period of time, observing the same rate of extraction and reextraction. Moreover, phenol transport was evaluated starting from synthetic wastewater of resin production plants type. The results exhibit the potential use of ACMs in the elimination and transport of organic species, even when analyte is initially found in complex solutions.
Which average of copolymer composition does NMR provide?
Authors: Radke Wolfgang
Published: April 2018

While in molar mass determinations different averages are clearly distinguished, such differentiation is usually not performed when dealing with the composition of copolymers or polymer blends. The present article shows that the mol ratio calculated by nuclear magnetic resonance (NMR) usually provides neither a weight nor a number average. Only if the composition does not vary with molar mass, or if both copolymer units are of equal molar mass, a weight average mol ratio is obtained from NMR measurements. The frequent assumption that NMR yields a number average composition is incorrect, therefore. However, the mass fraction calculated from NMR corresponds to the weight average mass fraction.
Crystal structure of methyl (1-phenylethyl)carbamate, C10H13NO2
Authors: Thakar Amit S. , Pansuriya Pramod B. , Friedrich Holger B. , Maguire Glenn E. M.
Published: April 2018

C10H13NO2, monoclinic, P21 (no. 14), a = 9.9882(7) Å, b = 8.5202(6) Å, c = 23.1403(18) Å, β = 91.010(2)°, V = 1969.0(2) Å3, Z = 8, R
gt(F) = 0.0387, wR
ref(F
2) = 0.0919, T = 173(2)K.
Crystal structure of (E)-4,6-diiodo-2-(((4-methoxy-2-nitrophenyl)imino)methyl)-3-methylphenol, C14H10I2N2O4
Authors: Hong Yong
Published: April 2018

C14H10I2N2O4, triclinic, P1̄ (no. 2), a = 9.2216(4) Å, b = 9.7072(5) Å, c = 10.0628(5) Å, α = 61.778(2)°, β = 77.716(2)°, γ = 79.144(2)°, V = 771.49(7) Å3, Z = 2, R
gt(F) = 0.0184, wR
ref(F
2) = 0.0542, T = 150(2) K.
Physicochemical Stability of Extemporaneously Prepared Oral Suspension of Fluconazole 50 mg/mL in SuspendIt™
Authors: Ip Kendice , Shan Ashley , Carvalho Maria , Baker Stacey , Banov Daniel
Published: April 2018

Background

There is a lack of an age-appropriate formulation of fluconazole. The extemporaneous preparation of an oral suspension with an extended beyond-use-date may represent a good therapeutic alternative for the paediatric population.

Methods

A fluconazole 50 mg/mL oral suspension was prepared and evenly distributed into twenty amber plastic bottles: ten bottles were stored in controlled room temperature (25 °C) whereas the remainder ten bottles were stored in refrigerated temperature (5 °C). The physical characteristics (colour/appearance, odor, pH and density) and chemical characteristics [fluconazole concentration using Ultra High Performance Liquid Chromatography (UPLC)] of the oral suspension were tested at nine pre-determined time-points over a period of 182 days.

Results

The density, pH and mean concentration of the oral suspension did not change significantly. The recovery of fluconazole ranged from 92.67 % to 98.79 % (5 °C) and from 94.31 % to 100.02 % (25 °C), both within the specification limits.

Conclusions

A palatable, sugar-free formula was developed for fluconazole 50 mg/mL in the oral suspending vehicle SuspendIt™ to allow an easy and rapid extemporaneous preparation in the hospital setting. The beyond-use-date of the formula was determined using a valid, stability-indicating analytical method and it was concluded that the extemporaneously prepared oral suspension is stable for 6 months at refrigerated and controlled room temperature.
Hat Papstgeschichte Zukunft?
Authors: Reinhard Wolfgang
Published: April 2018

Riassunto

Sembra che almeno in Germania si stia esaurendo l’attivita editoriale che riguarda i rapporti mandati dai nunzi alla segreteria di Stato. Nella digitalizzazione delle fonti si puo ravvisare una valida alternativa compensatoria, tanto piu che essa consentirebbe di creare una vasta banca dati che, raccogliendo i dati di tutte le persone e tutti gli uffici della curia, offrirebbe un’ottima base per ulteriori ricerche. In ogni caso e possibile raccordare la storia dei papi al nuovo approccio decostruttivista della storia politica e culturale, se si pone al centro dell’attenzione il papato nella sua qualita di singolare potenza culturale che coltiva una sua singolare cultura del potere. Decisiva e la constatazione che la chiesa papale non solo funse da modello per la formazione degli Stati europei, ma sarebbe diventata Stato essa stessa. In questo senso sarebbero auspicabili studi a lungo termine sul personale e sulle istituzioni. Accanto a questa storia materiale sarebbero utili sia l’indagine della devozione personale dei papi, e in particolare del culto mariano, che l’esplorazione del culto del papa e di altre pratiche premoderne, ma tuttora vive, nei credenti.
Study of electrokinetic and magnetic properties of ZrNi1-xRhxSn semiconductive solid solution
Authors: Romaka L.P. , Stadnyk Yu.V. , Romaka V.A. , Horyn A.M. , Krayovskyy V.Ya.
Published: April 2018

The features of electrokinetic, energy state and magnetic characteristics of ZrNi1-xRhxSn semiconductive solid solution were investigated in the ranges: T = 80-400 K, x = 0-0.10. It was shown that substitution of Ni atoms (3d84s2) by Rh atoms (4d85s1) in the structure of ZrNiSn compound generated the structural defects with acceptor nature, and holes became the main charge carriers in the ZrNi1-xRhxSn at low temperature. Based on analysis of the motion rate of the Fermi level ΔεF/Δх in ZrNi1-xRhxSn to the valence band and change of sign of thermopower coefficient from positive to negative it was suggested that the structural defects of acceptor and donor natures were generated simultaneously (donor-acceptor pairs), and deep donor band ɛD2 was formed.
A quantum chemistry study on the interaction between silica surface and aqueous alkaline solutions
Authors: Kravchenko A. A. , Demianenko E. M. , Grebenyuk A. G. , Lobanov V. V.
Published: April 2018

A quantum chemical analysis has been carried out of the equilibrium structure and energy parameters of hydrated Li+, Na+, and K+ cations interacting with ionized silica surface by means of density functional theory method with extended basis set 6-31++G(d,p) and exchange-correlation functional B3LYP. The calculated adsorption energy values related to those cations reproduce the experimental adsorption row of alkali metal cations at pH = 10.
Successful Management of Chylothorax With Etilefrine: Case Report in 2 Pediatric Patients
Authors: Muniz Gysella , Hidalgo-Campos Jennifer , Valdivia-Tapia Maria del Carmen , Shaikh Nader , Carreazo Nilton Yhuri
Published: April 2018

Chylothorax is defined as the accumulation of chyle within the pleural space. Originally described in 1917 by Pisek, it is the most common cause of pleural effusion in the neonatal period. The leading cause of chylothorax is laceration of the thoracic duct during surgery, which occurs in 0.85% to 6.6% of children undergoing cardiothoracic surgery. Few authors of reports in the literature have looked at etilefrine, a relatively unknown sympathomimetic, as an option for the medical treatment of chylothorax. In this case report, we review the clinical course of 2 infants with type III esophageal atresia who developed chylothorax after thoracic surgery and were successfully treated with intravenous etilefrine after failing initial dietary and pharmacological management.
The use of entropy analysis to evaluate the development of characteristics in dairy cattle of Holstein breed
Authors: Pidpala T. V. , Kramarenko A. S. , Zaitsev E. N.
Published: April 2018

The article presents the results of research on the evaluation of the development of dairy cattle characteristics in Holstein breed of different selection using entropy-information analysis (EIA). According to the studied indicators of dairy productivity their determinism is low, because there are many factors which influence the development of the signs. The degree of organization and informative content for Holstein breed cows of German and Ukrainian selection in adjacent generations has been established according to the basis characteristics of productivity, reproductive and adaptive ability of animals. The highest level of prevalence was characterized by signs of fat and protein content in milk as in the firstborn Holstein cows of German and Ukrainian breeding. Comparing to mothers, daughters have not only the highest level of informative content, but also have a bigger number of determinism. The probable influence of the «generation» factor was established only on the content of fat in milk. The smallest values of absolute organization the system were characterized by signs, the development of which is largely due to factors of environment. Signs which characterize reproductive and adaptive abilities of cows generally have lower entropy evaluations. This indicates their higher determinism and, consequently, biological importance. Especially it is true for the duration of the dry period in cows of the Holstein breed of German breeding. It is known that it causes physiological processes in the transitional period between two lactations and, accordingly to this, it influences the milk productivity of cows, especially, in the next lactation. Typically, according to the two signs (the duration of the first lactation and the duration of the given-birth period), we determined the probable effect of background (breeding) on the degree of their determinism (in both cases: P < 0.05). At the same time, according to these features in animals of German breeding the level of organization was higher than for Ukrainian selection of cows, regardless of generation. Thus, the use of EIA allows determining the effect of selection on the development of signs in dairy cattle.
Physico-chemical parameters of water for different methods of drinking commercial young blue fox (Vulpes logopus)
Authors: Shevchuk T. V. , Shamoluk B.
Published: April 2018

The article presents the results of the study of the physical and chemical parameters of water for different methods of feeding the commercial young blue fox. The research was carried out at a private brewery in the Khmelnytskyi Ds. on 500 moths of the main herd. Spraying the youngsters of the experimental group was carried out in a traditional way – fom combined drinking water, distribution of water was carried out daily manually. Animals of the experimental group were injected using an automated watering system. Water samples were taken from: a water pipe, from combined drinking water for an hour and 12 hours after hand delivery – in the control group, from self-steering racks for maintenance of fur animals – in the experimental group. An analysis of the dynamics of physical and chemical parameters of water (odor, color, turbidity, rigidity, active acidity, dry residue and chlorides) was carried out for different methods of watering, and compliance with their current norms for drinking water for farm animals was established. In the course of experimental studies, there were significant differences in the organoleptic parameters and water properties in the control group as compared to water samples. Thus, for manual distribution of water for 12 hour there was a deterioration of odor on 1.1 points, increase turbidity almost twice, decrease in acidity – by 1.06 units. The indicated indicators exceeded the maximum permissible norms. The reasons for violations of the quality of drinking water in the traditional way of drinking were: contact with feed mixes in combined drillers, the effect of abiotic and biotic factors, staining residues. In samples of water in the experimental group there were no significant deviations of physical and chemical indices: they were within the limits of permissible norms. Isolation of drinking water from the environment, dosing at the need of the animal proved to be the main advantages of the atomized method of drinking fur-bearing animals, which gives grounds to recommend it for introduction into production. Further scientific research will focus on the study of the microbiological characteristics of water for different ways of drinking fur-bearing animals and, in fact, blue fox. In addition, interesting from a practical point of view can be the study of productive indicators of commodity young animals of fur animals with different methods of watering. It should take into account not only the dynamics of animal growth, the quality of fur, the level of preservation, but also production costs, including changes in the structure of the cost of fur.
Correlation variability between live weight and weight of the incubation egg and body measurements of Obroshynska gray and Obroshynska white natural groups geese
Authors: Zaplatynsky V. S. , Fedorovych E. I.
Published: April 2018

This article shows data analysis of the correlation between the live weight of Obroshynska gray and Obroshynska white natural groups geese and the weight of the incubation egg, beside this the age repeatability of the live weight of the poultry has been investigated and the correlation variability of the aforementioned indicators and body measurements of the females and males of geese breeds have been analyzed. It was established that the most significant and highly reliable correlation bundles were between live weight and the weight of the incubation egg were detected in one day aged geese. In another researched age periods, these connections were sharply weakened and at 60-day aged geese reached the minimum values and were inconceivable. With the increase of the interval between the comparable age periods and the coefficients of repeatability of live weight were declined. In Obroshinsky gray natural group geese females – the coefficients of repeatability of live weight were depending on age and they ranged from 0.01 to 0.55, in males – from 0.01 to 0.57, and in the bird of the Obroshinsky white natural group geese were from 0,03 to 0.53, and from 0.02 to 0.65 respectively. In 30 to 60 days of aged geese of both sexes of both natural groups the coefficients of repetition of live weight were the highest and reached more than 50% at their high level. This indicates that live weight of geese selection can be carried out already at 30-day aged geese. The highest coefficients of the correlation in the birds of both geese natural groups were observed in all studied age periods between the live weight and the width of the pelvis, the length of the trunk, the length of the keel and the chest covering of the shoulder blades: in females they were within the range of 0.58–0.96, and in males – in the range 0.50–0.96 at P < 0.001 in all cases. However, it should be noted that the correlation of live weight, the length of the body and the length of the keel in both sexes geese from Obroshinsky gray natural group were more significant than in geese from Obroshinsky white natural group, but the correlation bonds between the living weight with the width of the pelvis and the chest covering of the shoulder blades on the contrary, were weaker. The weakest correlation were detected between the live weight and the length of the mold, leg and thigh in the poultry of both sexes of both groups in the 30–60 days aged geese.
Reproductive qualities, exterior features and the quality of the pery of obroshinsky gray geese at their dissolution «inside»
Authors: Sloboda L. , Sloboda O.
Published: April 2018

It was found that the average live weight of geese at the beginning of the oviposition was (OS – 3% X OS – 3%): goose – 6.10 kg, goose – 7.30 kg, and (OS – 5% X OS – 5♂): goose – 6,30 kg, goose – 7,37 kg. The average weight of OS–3 goose was 39.5 eggs per head, and OS–5 – 41.4 eggs. At the same time, the average weight of eggs in the 1st group was 154.3 g, and in II – 158.5 g. The indexes of the forms in the I group consisted of: the length of the egg – 84.4 mm, the width – 55.4 mm, the index of form 65.6 in the second group respectively – 84.3 mm; 56.3 mm; 66.7 mm. The study of the incubation qualities of eggs indicates that the higher fertility was in the goose of the second group and amounted to 85.3%, which is 0.9% more compared with the I group. It is known that the yield of caterpillars is dependent on fertility and in the 1st group this indicator was 71.8%, which is 4.3% less than in the second group (76.1%). At 9 weeks of age, males of the II group surpassed their peers from the 1st group by chest covering 1.79%., With a body length of 2.08%, and a kilo length of 7.14%. The same tendency was observed in the shoots of the shin and plyusny, so the males of group ІІ in the first indicator dominated the male and group I by 8,19%; in the second indicator males of the II group dominated the males of the I group by 6.68%. At 9 weeks of age, females of group ІІ grouped over their breasts over their peers from the 1st group by 2.40%, with the body length by 3.21%., With the length of the keel – by 2.34%. Length of the leg and shoulders in the females of the 2nd group were the largest and dominated by females and groups I by the first indicator at 5.26%; in the second indicator, females of the second group dominated the females of the I group by 1.08%. Males at all investigated periods had higher levels of total protein in serum than females. It was found that males at all investigated periods had higher levels of total protein in serum than females. Performance indicators of Ohorin gray geese (Group I) consisted of: carcass weight – 39.5 pc. on the head; the weight of eggs – 154.3 g; fertility – 84.4%; deductibility – 71.8%; the live weight of geese in the 9-week-old age is 4.52 kg males and 3.84 kg females; preservation – 90.7%. Obroshinsky gray goose (group II) are characterized by the highest indexes in relation to the first group: for fertility by 4.8%, fertility by 0.9%, output by 4.9%, live weight of geese at 9 weeks of age (males) – 1.99%, (females) by 0.52%, preservation – 2.90%, egg mass – 2.64%. The highest feather-down raw material was obtained at the age of 18 in geese I group. The basic indices of blood of the examined geese were within the acceptable limits of the norm.
Hematologic indices of the young rabbits with the preparation of the prebiotic preparation
Authors: Tsyganchuk O. B.
Published: April 2018

Blood is a liquid tissue that carries in the body the transport of chemicals, thanks to which the integration of biochemical processes takes place that take place in various cells and intercellular spaces, into a single system. The purpose of the study was to investigate the effect of feeding various doses of  Prebiolact-Kr on the morphological and biochemical parameters of the blood of repairing young rabbits. One of the new feed additives with prebiotic action is Prebiolakt-Kr, which was created by employees of the scientific and biotechnological enterprise «BTU Center» in Ladyzhin, Vinnytsia region. Studies were carried out on four groups of young rabbits, selected for the principle of analogs of 25 heads in each. The material for the scientific and economic experience was the rabbit of the modern meat hybrid hyplus. The comparative period lasted for seven days. The duration of the main period of the experiment is 126 days. The animals of the second group received Prebiolact-Kr in the amount of 1.5 g for the full-scale granulated mixed fodder, the third for 2.0 grams and the fourth for 2.5 grams per head per day. Blood for research was selected for serological plugs by puncturing the terminal ear vein with an injection needle. When taking blood, the rules of asepsis and antiseptics were observed. The picture of the state of blood is a symptomatic reflection of changes in the intensity of all metabolic processes that occur in the body of animals under the influence of certain food factors. As studies have shown, the number of uniform elements is within the limits of the norm, at the level of the control group. However, those deviations that were observed in the experiment were unbelievable. The positive result is that the administration of the drug did not affect the content of macro- and microelements in the blood, so it can be concluded that the administration of Prebiolact-Kr in the diet of experimental animals did not cause changes in the morphological and biochemical parameters of the blood.
Adaptive ability of the poultry and its importance in the selection of animals
Authors: Paskevych H. A. , Hunchak A. V. , Fialovych L. M.
Published: April 2018

An important property of living organisms is the ability to adapt to the influence ofthe externalfactors that is constant adaptation to environmental changes, while preserving the constancy of the internal environment. At the present levelof thedevelopment of poultry farming in agro farms of different types, the choice of the most adaptive and competitive breeds and crossbreds of the poultry in the production of eggs and meat is of great importance. Farm animals are affected by various external factors such as technology of keeping, production, veterinary and prophylactic and zootechnical measures. According to various scientific sources, a significant number of poultry crosses are used in Ukraine, mainly for the selection of leading firms in the USA, Canada, and Western Europe (foreign breeds in Ukraine account about 80% of the total poultry population). They provide a high degree of implementation of the genetic productivity potential, butunder rather controlled, almost climatic conditions of keeping and feeding. At the same time, they are very responsive to changing of environment when used in the conditions of the breeding and commodity enterprises of Ukraine. This is due to the fact that the main economic-useful signs of the bird (bearing, weight of eggs, reproductive qualities) have polygenic inheritance and, accordingly, have a small fate of additivity of the operating genes. Therefore, in the new conditions of exploitation of cross-breeds of foreign selection on the indicated signs there is a significant influence of interaction «genotype × environment», which reduces the combinational ability of the family farms and, accordingly, manifestation of the heterosys effect. To preserve the structure of the cross, adaptation of the original family forms to the specific conditions of the poultry holdings is necessary, and then the implementation of supporting selection during mass selection of repair young animals. It should be taken into account that the suitability of imported lines, family forms or final bird hybrids is limited to the limits of their physiological response, since their heredity is formed in the conditions of the country where they are bred. The problem of adaptation of poultry in the conditions of industrial poultry farming is constantly relevant. The intensification of the industry leads to the new adaptation factors, in particular, different technological conditions for repair young animals and adult herds, changes in the recipes of feed and the quality of their components in other regions, the movement of poultry, stresses and so on. At the present, it is important to take into account both adaptive responses, acclimatization capacity of poultry and other animals imported from abroad, and selection according to the indicators of the reaction of the body for different methods of their study. In this regard, it is advisable to use crosses that have high adaptive capabilities.
Identifying the resonance curve of a system subjected to linear and quadratic parametric excitations (case without damping)
Authors: Dinh Nguyen Van , Chi Tran Kim
Published: April 2018

Continuing our study in [3], in the present paper we examine the system without damping h = 0. In this particular case, the original equations and the associated ones are very simple and can easily be solved.
Buckling of nonlinear creep plates
Authors: Tan To Van , Doanh Pham Quoc
Published: April 2018

None
Interaction between the elements characterizing the forced and parametric excitations
Authors: Dao Nguyen Van
Published: April 2018

In nonlinear systems, the first order of smallness terms of nonresonance forced and parametric excitations have no effect on the oscillation in the first an approximation. However, they do interact one with another in the second approximation.Using the asymptotic method of nonlinear mechanics [1] we obtain the equations for the amplitudes and phases of oscillation. The amplitude curves are drawn digital computer. The stationary oscillations and their stability are of special interest.
Determination of reaction forces at kinematical joints
Authors: Sanh Do
Published: April 2018

The determination of reaction forces at kinematical joints of mechanism plays an important role in dynamics of machines. In the paper a method of determining the reaction at kinematical joints is presented.It is established a set of equations that are divided into two groups. The one describes the motion of the system and the other allows to calculate the reaction at kinematical joints.
Influence of non-linear parametric excitation on resonant characteristics of oscillating systems
Authors: Khang Nguyen Van , Son Tran Dinh
Published: April 2018

None
One modification of k-ε turbulent model of two-phase flows
Authors: Lien Hoang Duc , Antonov I. S. , Nam Nguyen Thanh
Published: April 2018

A modification of k-ε turbulent model is described with application to the numerical investigation of two-phase turbulent jets. In difference of existed two-parameter models, new three-parameter modification have been suggested. In this case an additional equation for transportation of turbulent energy of admixture – kP is used together with equations of transportation of carrier-phase turbulent energy – kg and its dissipation - ε. Additional dissipation terms in the above mentioned equations are defined in connection with a new examination of the between-phases interaction forces determining jet flows.
One method to determine the solution values at the boundary for the vertical two-dimensional equation system
Authors: Lich Tran Gia
Published: April 2018

In this paper, the boundary conditions for modified Navier-Stokes equations system are presented, and the complementary equations on the boundaries are established.
Unsteady pressure motion of viscous - plastic fluid between two infinite planes
Authors: Thanh Pham Hoai
Published: April 2018

In this paper we consider the problem on unsteady one - dimensional pressure flow of Svedov-Bingham's fluid between two infinite planes. We show that this problem can be solved completely by using Sliozkin-Targ's method with the approximation. We have some notices on the possibility of the application of this method for solving a class on unsteady flow of viscous-plastic fluid in pipelines without any supplementary assumption.
On the influence of second order non-linearity on random vibrations
Authors: Anh Nguyen Dong , Tinh Nguyen Duc
Published: April 2018

None
On periodic waves of the nonlinear systems
Authors: Can Le Xuan
Published: April 2018

The paper is concerned with the solvability and approximate solution of the nonlinear partial differential equation describing the periodic wave propagation. Necessary and sufficient conditions for the existence of the periodic wave solutions are obtained. An approximate method for solving the equation is presented. As an illustrative example, the equation of periodic waves of the electric cables is considered.
Solution to the problem of the elastoplastic stability of thin rectangular plates in two cases of boundary condition
Authors: Ham Vu Cong
Published: April 2018

None
Simple resonance in nonlinear torsional vibration systems of three variable generalized masses
Authors: Khang Nguyen Van , Son Tran Dinh
Published: April 2018

None
Strengthening balance of motion of gyroscope on mobile basis
Authors: Mau Nguyen Thanh
Published: April 2018

None
Calculation of the goffered multilayered composite cylindrical shells
Authors: Bich Dao Huy , Bay Vu Khac , Dung Dao Van , Thinh Tran Ich , Vinh Pham Chi
Published: April 2018

By using the effective modulus theory and Seydel assumptions the governing equations of the goffered multilayered composite cylindrical shell are formulated. Solution to the problem 1n term of displacements is given by the operator method, while the solution in term of stress function and deflection is obtained by Bubnov-Galerkin method in choosing appropriate forms of these quantities.
Calculation of the pressure on the valves of a sluice
Authors: Lich Tran Gia , Luat Le Kim , Trinh Han Quoc
Published: April 2018

This paper is devoted to a numerical method for calculating the pressure on the vertical two-dimensional valve basing on Navier-Stokes equations. Numerical solutions at interior points are established by splitting Navie-Stokes unsteady two-dimensional equations into two unsteady one-dimensional equations. An implicit scheme is obtained and the solution for these equations is established by the double sweep method. The values at the boundary points are calculated by the method of characteristics.
Parameter identification of soil-pile system by the dynamic testing method
Authors: Khiem Nguyen Tien
Published: April 2018

This paper deals with a problem to determinate parameters of soil and pile by measurements of natural frequencies and damping ratios of the system. There was suggested a model of soil-pile system, which includes more unknown parameters of soil to be determined. Here is given also mathematical base for extraction of modal parameters from measured spectral characteristics. The most important result obtained in this study is a procedure and' program carried out to determinate the pile length (L), elastic coefficients of soil around pile and at the bottom end of pile and also the damping coefficient of soil. Numerical test by the program shows high accuracy and validates effectiveness of the procedure.
A new form of equations of motion of nonholonomic mechanical systems
Authors: Sanh Do
Published: April 2018

In the paper it is given a new form of equations of motion of nonholonomic mechanical systems. The obtained equations are written in a matrix form and in order to establish them it is unnecessary to calculate the inverse matrix of the matrix of inertia. It is important that it is possible to obtain the relation between the error of realizing constraints and that of computing the solution of equations of motion of the system under consideration.
Free convection flow in a vertical annulus with power law fluid
Authors: Can Ngo Huy , Quang Vu Duy
Published: April 2018

None
A system of Van der Pol type under nonlinear parametric excitation
Authors: Dinh Nguyen Van , Chi Tran Kim
Published: April 2018

None
On the transverse vibration of beam under the action of some moving body
Authors: Khang Nguyen Van , Tho Do Xuan
Published: April 2018

In this work the structure method is applied for establishing the vibration equations of beam under the action of some moving body. An algorithm is build to solve the vibration equations of the considerable system. From this algorithm a computer program is set up with TURBO PASCAL 6.0 language.
Random oscillation in systems subject to the excitation of a class of coloured noises
Authors: Anh Nguyen Dong
Published: April 2018

In the paper the higher order stochastic averaging method is developed to a class of colored noise excitations when the corresponding forming filter has only finite negative eigenvalues. The second approximate probability density function to the Duffing system subject to the exponentially correlated process is obtained. Numerical application is carried out to investigate the independence of mean square amp1itude on the bandwidth parameter.
An algorithm for computation of rainfall water drainage through underground pipeline and canal network affected by tide
Authors: Dac Nguyen Tat
Published: April 2018

It is given in this study an algorithm to calculate flow in underground pipelines connected to canal system affected by tide. The real flow regimes have been taken into computation. Pipelines and canals are considered as one unique system so their interaction has been included in the algorithm. Based on this algorithm a computer program named CONG1093 has been developed and applied to a real problem of rainfall water drainage in Tan Hoa - Lo Gom region, Ho Chi Minh city. The results of application shows practical application of the developed numerical model
Dynamic absorber for the parametric oscillation of the rectangular thin plate of creep on elastic foundation
Authors: Da Hoang Van
Published: April 2018

None
Reduce impedance for branch component in structural dynamic synthesis
Authors: Si Nguyen Thac
Published: April 2018

None
Equations of dynamic and static problems of nonhomogeneous and anisotropic elastic layered-composite plates
Authors: Toan Pham Thi
Published: April 2018

The homogenization method for studying composite materials had been introduced in [1]. By this method the problem of nonhomogeneous and anisotropic elastic layered w composite material reduces to the set of problems of homogeneous, anisotropic elastic material. In this paper the governing equations of dynamic and static problems of layered - composite plates are formulated. An example is considered, obtained results can be compared with ones of multi-layered plate method.
New size number and the fracture state of concrete structure
Authors: Tu V. Tran
Published: April 2018

A new size number describing the fracture state of concrete structures is developed in which the structural size and the main fracture properties of concrete are dealt with. The relation between the fracture state of concrete beams loaded in bending and the newly proposed size number is presented graphically. The shape of the stress - crack curve, which is a typical property of most quasi-brittle composites like concrete, is found to be an important factor in determining the size number together with the fracture energy, the elastic modulus and the ultimate tensile strength of materials. The influence of 'the structural size on the fracture state is also graphically presented.
Longitudinal shock of two elastic bars with the 2nd bar bases on rigid foundation and meets visco-elastic resistance on side face
Authors: An Nguyen Thuc , To Nguyen Dang , Son Nguyen Hung
Published: April 2018

In this paper authors have studied problem of longitudinal shock of two elastic bars with more general model [1, 2]. Technically the model of this problem similar to driving pile, where the pile bases on rigid foundation and meets visco-elastic resistance of foundation on side face of the pile.
The studies of thixotropic properties of waxy crude oil from White Tiger and Rong fields
Authors: Bich Ha Van
Published: April 2018

As in production and transport of waxy crude oil, and as in practical rheological studies of non-Newtonian liquids, it is very important to find and characterize its thixotropic properties. There are some ways to study this phenomenon, but still existing equations can not quantifiably describe the time dependent behavior of thixotropic liquids with acceptable accuracy, using in this case an exponential or hyperbolic functions.
Identification of dynamical characteristics for distributed parameters systems from measured vibration data
Authors: Khiem Nguyen Tien , Mai Dao Nhu , Dac Nguyen Van , Khoa Nguyen Viet
Published: April 2018

This article is devoted to determinate the dynamical characteristics (Natural Frequencies, Mode Shapes, Damping Ratio) of elastic beam from measured responce auto-spectrum. Developed here method is based on the assumptions of smallness of the damping and sparse distribution of natural frequencies. Accuracy and practical meaning of the method are confirmed by the agreement of the theory with experiments.
Study of influence of incline vibration to the working condition of the vibration sieve
Authors: Sanh Do , Phong Dinh Van
Published: April 2018

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The longitudinal shock of two elastic bars with side viscoresistance of the second bar which is semiendless
Authors: An Nguyen Thuc , Anh Pho Duc , To Nguyen Dang , Son Nguyen Hung
Published: April 2018

In this paper authors studied the problem of longitudinal shock of two elastic bars of which the second bar is semiendless and its side resistance is caused by viscos. Where Authors determined the motions U1 (t, x), U2 (t, x) in the bars and shock time of the bars.
On the problem of optimal structure design subjected to regular lifetime criterion
Authors: Pho Nguyen Van
Published: April 2018

The objective function of problem of optimal structure design can be chosen differently. For example the objective function can be the weight, the net cost, the regular resistance, the regular reliability, an so on. In this paper the problem of optimal structure design, subjected to regular lifetime condition for all elements is considered. The author sets up the problem, proposes an iterative method for solving and apply the obtained results to a simple example.
Somes problems in the identification of elastic beam by the dynamical characteristics
Authors: Khiem Nguyen Tien
Published: April 2018

Two problems in the identification of Mechanical system are presented and solved by the analytical method. Firstly, the length of an elastic beam is found from measured natural frequencies. Secondly, the boundary condition of the beam was also obtained with given frequencies. In both the cases, unique solution can be found only with condition, that is given in this paper.
Determination of beam characteristics by its vibration measurement
Authors: Menh Nguyen Cao , Toan Tran Trong
Published: April 2018

On the basis of analyzing the transverse vibration of a clamped-free beam, in this paper an inverse problem is investigated. The analytical method· and computational program me have been presented for determination of the length of the beam when vibrations at some points on the beam with external distribution excitation or vibration at one point with some excited frequencies are measured. The obtained results from the illustration examples described in the paper give us the procedure for selecting one solution in multi-solution inverse problem.
Influence of different parameters on dynamic response of nonlinear oscillations
Authors: Le Nguyen Nhat
Published: April 2018

By simulating on personal computer, the nonlinear oscillations with large static deflection of elastic elements have been studied. It is consider the influences of different parameters, in particular, with the numerical value of degrees of smallness. The results at the neighborhood of the original position are accordant with ones of [3].
Influence of heat sources to finite channel conjugate natural convection of a power fluid
Authors: Quang Vu Duy , Chung Dang Huu
Published: April 2018

The paper extended the studies of Thomas F. Irvine et al. [1] and V. D. Quang and D. H. Chung [2] by considering the influence of heat transfer into the wall of vertical channel with natural convection motion of a power law fluid as well as the -influence of heat sources. The results obtained in s9me test cases showed that the influence of wall will be clear and impossible to neglect when thermal conductivity of wall is small enough, so the effect of heat source distributed in the fluid is more considerable than in the wall and the heat source from 50kW / m3 will make an effect more considerably.
On the dephase angle in a variational system of the equilibrium regime
Authors: Dinh Nguyen Van
Published: April 2018

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On the longitudinal motion of a thin ship travelling with constant forward speed in deep sea
Authors: Dat Nguyen Tien
Published: April 2018

In this paper, the problem of the longitudinal motion of a thin ship with a constant forward speed and direction parallel to wave direction is solved by using Fourier transform and expanding the velocity potential in Fourier integral on Eigen functions. The influence of the forward speed on the velocity potential of fluid is considered. In the case of a thin ship with zero - forward speed the result shown good agreement with the one obtained by other authors.
About the reaction at the robot leg
Authors: Huyen Pham , Mau Nguyen Thanh
Published: April 2018

In this paper the authors studies the robot reaction using the new controllable method of walking robot. The result gives us the most optimal motion for robot.
Longitudinal shock of two elastic bars with one spherical end
Authors: An Nguyen Thuc , To Nguyen Dang , Son Nguyen Hung
Published: April 2018

In [1] authors research problem of longitudinal shock of two elastic bars with one spherical end with the condition 0 < t < T2. In this paper authors continually researched this problem with the condition T2 < t < kT2 to finishing of the shock. According to the technology this problem is similar to the picture of driving piles.
QUADRATIC AND CUBIC NON-LINEARITIES IN A QUASI-LINEAR PARAMETRICALLY-EXCITED SYSTEM
Authors: Dinh Nguyen Van
Published: April 2018

A quasi-linear oscillating system always contains weak factors (negative and positive frictions, exciting forces in resonances, non-linarites of restoring forces) usually characterized by a small parameters €. Recently, some articles have   distinguished the degree of smallness of different factors and interesting phenomena have been found [3, 4]. In the present paper, using the same manner, we shall consider a quasi-linear parametrically-excited system and the difference between the quadratic non-linearity and the cubic one, will be observed.
Lower bound on deformation for dynamically loaded rigid-plastic structures
Authors: The Vu Van , Tinh Tran Ba
Published: April 2018

In this work comparisons are made between lower bound obtaining in [3], stronger and lower bound by The-Sawczuk. Finally the optimal problem is considered, namely that it must be chosen fi1(t) fi2 (xk), for which a lower bound displacement is maximized.
THE PROCEDURE OF THE SLIP MODELS OF POLYCRYSTALLINE PLASTICITY IN THE GENERAL CASES
Authors: Dan Bui Huu
Published: April 2018

The computation procedure of the slip model of polycrystalline plasticity was extended for the most general cases, when the stress and strain state are expressed in the five-dimension vector space this extent ion is based on the know ledges of Clifford algebra in the many-dimension (more than 3) vector space. The results would be reduced into the old results given in the more simple cases.
On the vibration of the block base under many parallel plane mechanisms
Authors: Khang Nguyen Van
Published: April 2018

In this paper the vibration equations of the block base under many parallel plane mechanisms were established. Using the Taylor's formula and neglecting the nonlinear terms we obtain the linear vibration equations having periodic coefficients. There equations can be solved by numerical method using digital computer.
Optimal control of systems with time delays
Authors: Le Nguyen Nhat
Published: April 2018

Hamilton's canonical equations and an algorithm of the conjugate gradient method are developed for systems with time delays. The results are applied to one concrete system.
Shock between absolutely solid body and elastic bar with the elastic viscous frictional resistance at the side
Authors: An Nguyen Thuc , Trieu Nguyen Dinh
Published: April 2018

The problem was solved completely in this paper. In the technical point of view this is model of the problem about shock between hammer and pile.
Tính toán bằng số dao động uốn tuần hoàn của thanh truyền trong cơ cấu bốn khâu
Authors: Khang Nguyen Van , Khiem Vu Van
Published: April 2018

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Tự chấn của dây có hai bộ tắt chấn động lực
Authors: Dinh Nguyen Van
Published: April 2018

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Ảnh hưởng của nguồn nhiệt và sự phụ thuộc nhiệt độ đến đối lưu trong kênh của chất lỏng quy luật mũ
Authors: Quang Vu Duy , Que Nguyen
Published: April 2018

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Một trường hợp ổn định tĩnh học của dàn khoan tự nâng
Authors: M. Entov V. , Tu Pham Huu
Published: April 2018

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Dao động ngẫu nhiên của hệ cấp ba dưới kích động ''ồn màu''
Authors: Tho Le Vinh , Chi Tran Kim
Published: April 2018

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Nguyên lý gaoxo trong va chạm cấp hai
Authors: Dinh Nguyen Van
Published: April 2018

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Convergence of corrosion fatigue curved lines and effect of statically corrosion fatigue on some kinds of steel
Authors: Hiep Nguyen Trong , Phuc Phan Huu
Published: April 2018

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So sánh hai phương pháp trong bài toán ổn định biến dạng các vật thể lưu biến
Authors: Tan To Van
Published: April 2018

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Bài toán ổn định ngoài giới hạn đàn hồi của bản và vỏ mỏng theo lý thuyết quá trình biến dạng đàn dẻo
Authors: Bich Dao Huy
Published: April 2018

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Sóng LAMB trong lớp vật liệu có biến dạng ban đầu thuần nhất
Authors: Vinh Pham Chi
Published: April 2018

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The dynamic problem of the elastic half-plane due to a force at its boundary
Authors: Bich Nguyen Dang
Published: April 2018

In this paper we presents the problem so put with initial condition according to stress a difference from the problem of boundary this problem answer not only the  condition of boundary but also the initial condition. The problem gives solution in two eases the initial condition is the root of sadow oaky problem and it is the root of Flam ant problem.
Dao động tham số - cưỡng bức của đầm đàn hồi chịu tải trọng ngẫu nhiên ở chế độ không dừng
Authors: Hung Nguyen Xuan , Khiem Nguyen Tien
Published: April 2018

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Elasto - plastic analysis of anisotropic hardening materials by finite element method
Authors: Hien Tran Duong
Published: April 2018

An elasto- plastic analysis for general three dimes10nal problems using a finite element model is presented. The analysis is based on Hill's yield criterion which included anisotropic materials displaying kinematic - isotropic hardening. The validity and practical applicability of the algorithm are illustrated by a number of numerical examples, calculated by a computer program written in fortran.
About motions of a catamaran in regular waves
Authors: Dat Nguyen Tien
Published: April 2018

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Truyền sóng vuông góc với lớp trong môi trường vô hạn không nén được, phân lớp tuần hoàn có biến dạng ban đầu thuần nhất
Authors: Vinh Pham Chi
Published: April 2018

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Dynamic absorber for self-excred system with distributed parameters (vibrating string)
Authors: Dao Nguyen Van
Published: April 2018

The dynamic absorber may be used to damp the self - excited vibration or the string. The friction mechanism of absorber (λ) has decisive influence on the amplitude of self-exerted vibration of the string. For the strong dynamic absorber the increasing of the friction force (λ) leads to the decreasing of the amplitude or vibration of the string. For the weak dynamic absorber (m, c are small) the effect of damping will be achieved only with some mean values of the friction force.
On the quasi – stationary state of vibration in mechanical system with random excitation
Authors: Hung Nguyen Xuan , Khiem Nguyen Tien , Hien Tran Duong
Published: April 2018

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