bluuebunny/crossref_metadata_2025 huggingface dataset:
Effect of DAP Fertilizer Source and Nano Fertilizers (Silicon and Complete) Spray on Some Growth and Yield Indicators of Rice (Oryza sativa L. cv. Anber 33)
Authors: Al-Khuzai A. H. G. , Al-Juthery H. W. A.
Published: August 2020

In order to evaluate some growth and yield indicators of rice (cv. Anber 33) towards the various fertilizer treatments (DAP fertilizers and Nano fertilizers), a field experiment was implemented in the summer season of 2019 in one of the rice fields of Ghamas district/Al-Diwaniyah Governorate located between the points (3509948. 464130) – East and (3509938. 464132) – North, with the total area of 435 m2. The experiment consisting of two factors was designed according to the Randomized Complete Block Design (RCBD) with three replicates for each treatment, as the first factor represented by DAP fertilizer source consisted of four treatments (Control, M-DAP, O-DAP + micronutrients and O-DAP high K), while the second factor consisting of spraying Nano fertilizers consisted of four treatments (Control, Nano silicon, Nano complete and Nano silicon + Nano complete).

The studied indicators on the rice plant included chlorophyll content in leaves (SPAD unit), plant height (cm), biological yield (ton h−1), grains yield (ton h−1), harvest index (%), fertilization efficiency for production (%). Results showed the superiority of O-DAP + micronutrients fertilizer in achieving the highest chlorophyll content in leaves, biological yield, grains yield and fertilization efficiency for production compared with M-DAP fertilizer which achieved the highest mean of plant height, as well as O-DAP high K fertilizer which achieved the highest mean of harvest index. Also, spraying with Nano fertilizer habits with significant results on the studied indicators, especially with the treatment Nano (silicon + complete) that achieved the highest means for the majority of the studied indicators, and that their interaction between O-DAP + micronutrients fertilizer with Nano (silicon + complete) fertilizers achieved the highest meanes for the most important characteristics of the crop represented by the chlorophyll content in leaves, grains yield, fertilization efficiency for production.
Prediction of Body Weight at Six Months of Age from Body Measurements at Birth in Iraqi Buffalo Calves
Authors: Faraj Al-Hillo Murtadha , Luaibi Dagher Al-Khauzai Allawi , Allawi Luaibi Al-Hraishawi Israa
Published: August 2020

This study has been conducted in Basrah province during 2019 by using 90 buffalo calves, weight at birth(W0) and weight at six months of age (BW6) and their body measurements at the same age such as, body length (BL), wither height (WH), hip height (HH), chest grith (CG) and hip girth (HG) are recorded. The current study aims to predict (BW6) from the body measurements at birth, also to predict BW6 from their body measurements at the same age.The results obtained of the current study can be summarized as follow :The overall means of W0 and BW6 are 37.159 and 124.241 kg respectively, and the overall means for body measurements at birth and at six months of age are : 76.778 (BL0) 73.088 (WH0), 91.470 (HH0), 104.274 (CG0) and 112.780 (HG0) and 90.815 (BL6), 88.333 (WH6), 102.852 (HH6), 122.00 (CG6) and 129.852 cm for (HG0) respectively. The results in this study explain that the first equation which depending on BL0 is the best predictor to weigh at six months of age where inquires a high correlation coefficient as 0.577 with adjusted R2=0.320.It is observed that the twenty –fourth equation is the best equation among the equations to predict BW6 from body measurements at birth which is based on four measures (WH0, HH0, CG0, HG0),as it achieved adjusted R2=0.384 and with allow standard error estimate (4.20) . It is found that first equation is the the best that depended on (BL6) as achieved adjusted R2=0.447. Significantly simple correlation coefficients between BW6 with their body measurements are ranging from 0.209 to 0.676 at six months of age. Also it is observed that fourth equation to predict W6from body measurements at the same age is the best which is based on (BL6, HG6),where the values of correlation coefficient and adjusted R2are 0.700 and 0.470 respectively and the standard error estimate for this eqation is low (3.90) comparison with other equations.Finally, previous equations could be used to predict weights from body measurements at birth and six months of age, easily, cheaply, rabidly and well accepted by the breeds when weighing scales are not available in the commercial herds.
Desertification in Iraq and how to Combatit
Authors: Farooq Ahmed Fartm Zuhair
Published: August 2020

Iraq faces many environmental challenges as a result of its geographical location within arid and semi-arid regions, as well as the economic, political and security conditions it faced. Desertification comes at the forefront of these challenges as it is considered one of the dangerous environmental manifestations because of its direct impact on food security and the impact on human health, which is the goal and main tool for development. This problem has been exacerbated during the last two decades due to several reasons, the most important of which are climate change, low rainfall rates, misuse of natural pastures, overgrazing and urban sprawl at the expense of agricultural lands in addition to unsustainable farming methods and wrong practices in irrigation operations and the increase in land areas affected by salinity and the significant deterioration in vegetation and those Covered by Moving sand dunes as a result of land degradation and erosion. In addition to the phenomenon of drying marshes, as they dried more than more than 90% of its area, and the research dealt with dividing the land of Iraq according to its production capacity into eight comprehensive sections for eight varieties.
Effect addition of the peppermint oil to barley straw in some characteristics of fermentation in the rumen, in vitro digestibility and metabolic energy
Authors: Mustafa Sameen Al-Bayati Mohammad , Hussein Kuttar Ahmed
Published: August 2020

This study aimed to investigate the influence of adding different concentrations of peppermint oil to barley straw in some fermented rumen features, in vitro digestibility and energy of metabolism. The results showed a significant decrease (p<0.01) in the pH of all treatments except T4, during all incubation period in comparison with the control treatment. The results also presented a significant increase (p<0.01) in the concentration of the nitrogen of ammonia in treatments of T3 and T4 and during every part of incubation periods in comparing with the control treatment. Additionally, a significant decrease (p<0.01) was discovered in the in vitro dry matter, digestibility organic substances and metabolic energy compared with the treatment of control.
Comparison the Effect of Adding Waterly Extract of Black Seeds (Nigella Sativa ), Chamomile and Fenugreek with Drinking Water on Productive Performance for Broiler
Authors: Mohammad Al-Kerwi Mahdi S. , Amin Al-tawash Ali S. , Salah Almrsomi Tariq
Published: August 2020

The present study was conducted to compare the effect of adding waterly extract of black seeds(Nigella Sativa ), chamomile and fenugreek seeds individually with drinking water on the productive performance of broilers, the addition started from the age of 8 days. It used 180 unsexed chicks from the Ross 308 strain and randomly distributed the chicks to 4 treatments. The Control treatment where drinking water was provided to the birds free of any addition.T1-Treatment of addition of watery extract of Nigella Sativa with bird drinking water T2-Treatment of adding watery extract of chamomile with bird drinking water. T3-Treatment of adding watery extract of fenugreek with bird drinking . The results of the statistical analysis indicated that there was a significant improvement in the rate of final live body weight, the rate of weight gain and feed consumed for T1 and T2 treatments . There were no significant differences among treatments in the feed conversion ratio, there was no mortality of chicks during duration of the experiment.
Eigenvectors for a Cylindrical Shell under Axial Impact
Authors: Zhang WX , Hu XW
Published: August 2020

A lot of research on dnamic buckling of cylindrical shells has been carried out, which greatly promotes the development of dynamic stability theory of shells. However, the existing theoretical analysis methods belong to the Lagrangian system, so it is difficult to apply the traditional variable separation method. In this paper, a symplectic system method for the dynamic buckling of elastic cylindrical shells under axial impact is presented. In symplectic space, the critical buckling load and dynamic buckling mode are simplified as general eigensolutions. In numerical results, the critical buckling load modes of elastic shells under different boundary conditions are given.
Analysis on Poisson’s Ratio of Linear Viscoelastic Solids
Authors: Zhang WX , Yang LM
Published: August 2020

The Poisson’s ratio is the absolute value of the ratio of transverse strain to axial strain under simple tension or compression, which can reflect the transverse deformation of the solid. Viscoelastic mechanics is to establish the constitutive relationship of stress and deformation components on the premise of fully reflecting the viscous characteristics of materials, so as to solve the problem of stress and deformation analysis.
Timoshenko Beams and the Hamiltonian System
Authors: Zhang WX , Yang LM
Published: August 2020

The significance of the transition from Lagrangian system to Hamiltonian system lies in that it has entered the form of symplectic geometry from the traditional Euclidean geometry and broken through the traditional concept, so that the dual mixed variable method has entered into the vast field of applied mechanics. Thus the Hamiltonian system method is very significant for engineering mechanics system and even mathematical physics method. It provides a powerful tool for discussing this kind of problems and improves the solution of elasticity to a new platform.
A Study on the Dynamic Problems of Cylindrical Shells under the Coupling of Tensile and Torsional Forces
Authors: Zhang WX , Yang LM
Published: August 2020

In this paper, the critical buckling load and dynamic buckling mode are reduced to symplectic eigenvalues and eigensolutions in symplectic space according to the non synchronous propagation of axial stress wave and torsional stress wave in cylindrical shell. Moreover, the eigensolutions are numerically solved by using the bifurcation theory of dynamic buckling. In the numerical computation, the influence factors of critical buckling load and the occurrence and development of buckling modes are discussed.
A New Computational Approach for Viscoelasticity
Authors: Zhang WX , Yang LM
Published: August 2020

Viscoelasticity is the basic content of solid mechanics, which has become an important part of continuum mechanics. It usually includes two aspects: one is the description of viscoelastic properties and the expression of constitutive relationship; the other is the establishment and solution of boundary value problem. In this paper, based on Legendre transformation, a new numerical method which can effectively deal with viscoelastic boundary conditions is established.
Stress fitting and forecast model of dams based on BP neural network
Authors: Hou Wenang , Fang Xushun , Li Minghua , Yan Zhikun , Wang Xiaochun
Published: August 2020

Safety monitoring is significant in the daily management of the dams. Plenty instruments are planted in the dam to collect the health data of the dam. It is essential to evaluate and forecast the condition of the dam. This paper proposed a method to forecast the future stress condition of the dam.
Design and durability analysis of marine concrete
Authors: Zhao Xirui , Gao HuaXi , Fan Wei , Duan Yue , Shang Ziqi , Hou Jinglong
Published: August 2020

Marine engineering is an important way for a country to go deep blue. In the marine environment, there are many factors that affect the durability of concrete, among which the most harmful one is chloride ion erosion. In order to improve the ability to resist chloride ion permeation, this paper designs, compares and selects the appropriate water cement ratio of marine concrete, with the use of new anticorrosive technologies such as epoxy coating and silane impregnation. The design service life and the chloride ion diffusion coefficient prediction are analysed by establishing models, and this paper verifies whether the engineering design meets the service life requirement.
Analysis and application of interactive supervised classification in Broome County, NY
Authors: Yuan Xingyu
Published: August 2020

Land cover classification is essential in urban sprawl. It helps the urban planners and the policy makers to understand their urban communities. Interactive supervised classification (ISC) function in ArcMap can produce land cover classification map. Based on the analysis and comparison of the accuracy of ISC map and land cover classification products, GLC, GLOBC, and MCD, ISC map has the highest user’s accuracy in identifying developed urban area, forest, water body and crop/pasture, and highest overall accuracy, which provides efficient technical support for urban planning and decision-making.
PHOENICS-based Simulation Study on Winter Wind Environment in Outdoor Space of Old Communities—Taking Sanlihe Community of Beijing as An Example
Authors: Shang Yuqing
Published: August 2020

The quality of wind environment is closely related to the comfort of outdoor space, and the wind environment is an important factor affecting outdoor activities of urban residents in winter. Taking the old Sanlihe Community in Beijing as an example, this paper uses the PHOENICS simulation software to simulate the outdoor wind environment of the community in winter in a physical way, analyse problems existing in the outdoor environment in a more scientific way, and put forward optimization suggestions, so as to provide an objective basis for future practical transformation.
Analysis of Small Fluctuation Stability of Upstream and Downstream Double Surge chamber Diversion Power Generation System
Authors: Geng Qinghua , Liang Chuan , Ju Xiaoming
Published: August 2020

Installation of upstream and downstream surge chamber is a significant and feasible measure for peak pressure control in the hydropower system with long water diversion and drainage tunnel. This paper presents a study on the fluctuation stability with such a measure. For this system, a complete mathematical model including diversion pipeline, upstream surge tank, hydraulic turbine and downstream surge tank was developed, calculating the hydraulic transition characteristics and analyzing the fluctuation stability with different surge tank cross areas. The calculation shows that, the hydropower system with upstream and downstream surge chamber, can also be stable even if the surge tank cross area is smaller than the calculated value. In practice, in the condition of meeting the stability requirement, multiple schemes should be calculated in order to find out the minimum areas to reduce project investment.
A numerical simulation study on the sedimentation dredging in Lushui Reservoir, part 1: model building and validation
Authors: Ge Hua , Deng Chunyan
Published: August 2020

Based on the characteristics of the river regime, sediment deposition and the distribution of hydrological stations in Lushui reservoir, a depth-averaged two-dimensional flow mathematical model is established in this paper. Then based on the filed data observed at the hydrological station networks in the reservoir, the mathematical model was verified and calculated. The validation simulation results show that the mathematical model can well reflect the flow movement in the studied reach, and this will provide a good technical support for the influence of sedimentation dredging in the reservoir area.
Effects of land use on processes governing water quality in urbanizing catchments: A case study in the Liangjiang New Area, China
Authors: Luo Kun , Wu Conglin , Zheng HeZhen , Hu Xuebin , He Qiang , Shao Junrong
Published: August 2020

Understanding the effects of land use on processes governing water quality is important for watershed planning and management. This study evaluated the difference in pollution factors due to land use in Liangjiang New Area. Water samples were collected in April (dry season) and September (wet season) of 2014 and 2015 at 20 subcatchments. According to the similarity in land use compositions, cluster analysis divided subcatchments into four land use groups, representing different urbanization levels. The factor analysis identified five pollution factors which explained more than 80% of the variance in data, and revealed nutrients pollutions, anaerobic conditions, soil erosion, effects of eutrophication and oxygen consumption in the rivers, respectively. Using the analysis of principal component scores, we found that the magnitudes of pollution factors were significantly different among the land use groups. Moreover, urban land use had a significantly positive relationship with pollution factors, whereas forest land and farmland displayed opposite effects.
The influence of LUCC on water demand in the north slope of Tianshan Mountain
Authors: Ma Hengli , Sun Jianguo
Published: August 2020

This paper analyzes the spatial distribution and change of domestic water in the economic belt of the northern slope of Tianshan Mountains, understands the influence of LUCC process on domestic water, and provides a scientific basis for sustainable utilization and management of domestic water in arid areas. In this paper, the conventional linear fitting method is used to analyze the temporal and spatial change trend of domestic water use and the impact of land use change on it in 1989-2017 in the northern slope of Tianshan economic belt. The results show that from 1990 to 2018, the area of urban and rural industrial and mining residential areas increased by 1734km2, the population increased by 158.58 × 104, the total domestic water consumption increased from 125 × 106m3 in 1989 to 398 × 106m3 in 2017, and the per capita domestic water consumption also increased rapidly, especially in urban areas. The spatial difference between per capita domestic water consumption and total domestic water consumption in the whole year is obvious. It can be seen that the LUCC process has an important impact on the change of domestic water consumption.
Research Progress on Dynamic Monitoring Technology of Soil Erosion in Sloping Farmland
Authors: Li Xiaofang , Song Yuejun , Xie Songhua , Liao Kaitao , Shi Zheng
Published: August 2020

In this paper, the dynamic monitoring of soil erosion on sloping farmland was systematically summarized and analyzed from the two aspects of research methods and monitoring techniques. In terms of monitoring methods, the main methods are field runoff monitoring test plot observation, indoor and outdoor artificial simulated rainfall observation and water flushing test observation. In terms of monitoring technology, there are mainly contact monitoring technologies such as steel brazing, erosion needle and element tracing, and non-contact monitoring technologies such as three-dimensional laser technology, close range photogrammetry and model simulation prediction. Among them, the field runoff monitoring test plot observation method can obtain the natural soil erosion on the slope, the artificial simulated rainfall and water flushing test can realize the human controlled soil erosion monitoring test on the slope, and the test data has better availability and controllability. In terms of monitoring technology, 3d laser and close-range photogrammetric reconstruction technology have prominent advantages in dynamic monitoring of soil erosion on slope surface, which provides a new monitoring means and ideas for soil erosion monitoring on sloping farmland.
Calculation of Loss Amount from Southeast of the Bay to West of Bay Mouth
Authors: Yang Dongfang , Zhu Hong , Ling Weifeng , Wang Qi , Li Haixia
Published: August 2020

Using survey data of Pb in water body from southeast of Jiaozhou Bay to west of bay mouth, in August 1992 and according to the horizontal change model and the vertical change model of matter content put forward by authors, we calculate the horizontal loss amount, vertical diluted amount and vertical sediment amount of Pb in surface and bottom layer and determine the model diagram of Pb content horizontal and vertical changes. The results showed that in water body from southeast of Jiaozhou Bay to west of bay mouth in August, the absolutely horizontal loss amount of Pb content in surface layer and bottom layer was 4.32 - 5.29μg/L, and the relatively horizontal loss amount of Pb content was 28.01 - 38.23%. The absolutely vertical sediment amount of Pb was 6.61 - 7.58μg/L in both surface and bottom layer, and the relatively vertical sediment amount was 40.14 - 48.63%. In the surface water in August, the main sea current carrying Pb content moved through a ring of nearshore water when the Pb content in the surface and bottom layer deposited to the seabed in large quantities. During the horizontal migration of Pb content in the surface and bottom waters, the loss amount of Pb content in the surface layer and bottom layer reached almost 30.00% and that in the surface layer even reached almost 40.00%. It revealed that the high content Pb on the surface could rapidly and continuously settle to the seabed almost 30.00% of the Pb content in the water remained at the bottom of Jiaozhou Bay. In August, in the process of vertical migration, the Pb content transported by main sea current was relatively high. From the waters in the southeast of the bay to the waters in the west of bay mouth, the vertical sediment amount of Pb content in the surface and bottom increased from 40.14% to 48.63%, and the deposition of high Pb content accumulated in the seabed of Jiaozhou Bay.
Effect of the sampling method on the results of melt quality assessment of aluminum alloys with computed tomography
Authors: Gyarmati G , Fegyverneki Gy , Tokár M , Mende T
Published: August 2020

Liquid metal quality is one of the key factors which determine the soundness of cast parts. This is the reason why the assessment of the melt quality is of critical importance prior to casting. The most common and most deleterious defects of liquid aluminum alloys are the so-called bifilms whose quantity can be characterized by the computed tomographic porosity analysis of reduced pressure test pieces. During the sampling of these specimens, however, generally pouring is involved, which is known to damage melt quality and introduce bifilms into the liquid metal. For this reason, a new sampling method was tested and compared with conventional pouring. It was found, that by using the new sampling method, the pore volume fraction of the test pieces can be lowered, however, regarding the pore number density, no clear difference could be observed. The results also suggest that fluxes have a remarkable effect on the structure of double oxide films, and in this way, on the susceptibility to pore formation.
Development of new cladding types for nuclear fuel
Authors: Hózer Z , Novotny T , Perez-Feró E , Horváth M , Pintér Csordás A , Szabó P , Illés L , Schyns M , Delville R , Kim D , Kim W J , Ševeček M
Published: August 2020

Three different cladding types were tested for nuclear fuel in traditional light water reactors and generation IV gas-cooled fast reactors. Cr coated Zr cladding was tested in steam atmosphere up to 1200 °C to demonstrate moderate oxidation and hydrogen production in accident conditions. 15-15Ti stainless steel alloy and SiCf/SiC cladding tube samples were treated in helium atmosphere with different impurities for several hours at 1000 °C. Additional mechanical testing and microstructure examinations were carried out with as-received samples and with specimens after high temperature treatments. The experiments results indicated the applicability of the tested materials for reactor conditions in the investigated range of parameters.
Influence of 3D printing parameters
Authors: Ficzere P , Lukács N L
Published: August 2020

In this study, the influence of printing parameters have been investigated. The inner structure of 3D printed specimens were captured by a scanning electron microscope and these records were investigated by a CAD software. The mechanical properties of 3D printed parts can be determined by the size changing of failures between layers. Additive manufacturing technologies have become widely used, for this reason the influence of printing parameters must be well known. Optimisation of production time and mechanical strength is possible with this method.
The effect of titanium dioxide on the moisture absorption of polyamide 6 prepared by T-RTM
Authors: Viktória Semperger Orsolya , Suplicz András
Published: August 2020

In recent years, the replacement of metal components with composites is becoming more and more common in the automotive industry. Thermoplastic composites are recyclable, which meets requirements. Impregnating the reinforcing material is difficult but caprolactam is a good choice because in melt state, it has similar viscosity to that of water. Polyamide 6 can be produced from caprolactam by ring opening in-situ polymerisation. We produced PA 6 samples from caprolactam using T-RTM. We examined the effects of the manufacturing parameters on morphology on residual monomer content and crystalline proportion. Then we filled the samples with TiO2and examined the same parameters. Finally, we tested the effects of crystallinity, residual monomer content and the filler on moisture absorption.
Deformability Tests of Pure Niobium
Authors: Mertinger V , Aviles Santillana I , Benke M , Gallifa Terricabras A , Hlavács A , Janovszky D , Kárpáti V , Krállics Gy , Mikó T , Palotás A B , Sepsi M , Szabó G , Szobota P , Szűcs M
Published: August 2020

A research team at the University of Miskolc’s Faculty of Materials Science and Technology has signed a cooperation agreement with the Geneva-based European Organization for Nuclear Research (CERN) for testing of the materials employed in the Crab Cavities will be installed in the next generation of the LHC (the so-called High Luminosity Large Hadron Collider – HL-LHC). At the University of Miskolc, high purity niobium rolling experiments were carried out in conventional (unidirectional) and cross-rolled manners in order to increase the deep drawability of the final sheet. The deformability of niobium was measured by Watts-Ford and compression tests. The microstructure and anisotropy (texture) results of the initial material and the straight-rolled products are reported.
The effect of microstructure on the dynamic mechanical properties of carbon fiber and carbon nanotube reinforced multi-scale composites with a polyamide 6 matrix
Authors: Petrény R , Mészáros L
Published: August 2020

We investigated the microstructure and the related dynamic mechanical properties of carbon fiber and carbon nanotube (CNT) reinforced, polyamide 6 (PA6) matrix multi-scale composites. Differential scanning calorimetry (DSC) showed that in composites reinforced with only carbon nanotubes, the aggregated nanotubes have a moderate crystal nucleating effect. However, in the hybrids, the carbon fibers and the uniformly dispersed CNTs have a notable crystal nucleating effect. It means that a crystalline interphase is formed around both the carbon fibers and the carbon nanotubes. As the interphase has higher modulus than the bulk matrix, it has an additional reinforcing effect and transfers the load better to the microfibers. We confirmed this theory by dynamic mechanical analysis.
Modeling the deformation behavior of polymer sandwich structures with inhomogeneous core
Authors: Takacs Laszlo , Szabó Ferenc
Published: August 2020

Polymer sandwich structures become widely used in the transportation industry due to their high bending stiffness and strength combined with low weight. In the conceptual design phase, it is essential to model the mechanical behavior of the sandwich properly in full-vehicle scale in order to analyze different design variants effectively. In this paper, a finite element modeling method is shown. The method is introduced on a sandwich structure with glass fiber reinforced, vinyl-ester matrix composite face-sheets and a PET foam as core material with an inhomogeneous structure. To model the sandwich panel with layered shells, where the core material is a single layer, equivalent stiffness constants of the inhomogeneous core are needed. To determine these constants, a detailed finite element model was created and virtual tensile and shear tests were performed. On the other hand, an analytical method was also shown. By applying the Voigt- and Reuss-rule on the inhomogeneous core, the needed stiffness constants can also be determined properly. Results of the two methods were compared and they showed a good correlation. Validation of the model was performed via comparing the results of the 4-point bending experimental tests and the simulation results.
Characterization of short fiber-reinforced polylactic acid composites produced with Fused Filament Fabrication (FFF)
Authors: Csenge Tóth , Norbert Kovács Krisztián
Published: August 2020

The interdisciplinary expansion of additive manufacturing (AM) technologies resulted in an increasing demand for high-performance materials for engineering applications. In order to enhance the mechanical properties of printed products, short fiber composites are of great interest recently. In this study, the development of short fiber-reinforced composite materials is performed along with the mechanical characterization of the samples produced by fused filament fabrication (FFF) technology.
Comparison of CT and metallographic method for evaluation of microporosities of dye cast aluminum parts
Authors: Bubonyi Tamás , Barkóczy Péter , Gácsi Zoltán
Published: August 2020

Nowdays, the different material characterisation and testing methods are constantly evolving. With modern techniques, we have the ability to take a look inside the product without sample cutting, with modern CT systems. The modern techniques with their development become closer and closer to industrial applications. However, the testing protocols are sometimes 1 or 2 steps behind. This is mostly due to the cost or the complexness of the new testing methods. In this study we would like to take a quick look on the current standard industrial testing of porosities and microcracks and compare them with computer tomograph assisted testing.
On the necessity of domestic research on nuclear materials science
Authors: Trampus Peter
Published: August 2020

Globally, systematic research is going on to better understand the operation induced degradation effects of reactor structural materials and to enhance the effectiveness of their in-service monitoring. In Hungary, there are four reactor units in operation and two new ones are soon to be built. Some of the construction features of the new units differ from that of the operating ones. In order to be prepared in time for efficiently managing materials science related questions, it is necessary to establish a coordinated research program utilizing the capabilities of domestic research institutions. This paper describes the major elements of this potential program. Implementation of the program can assist ageing management activities of the operating units.
Preparation and characterization of poly(lactic acid)/boehmite alumina composites for additive manufacturing
Authors: Lendvai L , Fekete I
Published: August 2020

The purpose of this work is to investigate the suitability of boehmite alumina (BA) reinforced poly(lactic acid) (PLA) for additive manufacturing with the fused filament fabrication method. PLA filaments with 0-10 wt.% BA content were produced via melt compounding using a twin-screw extruder. Dumbbell-shaped and prismatic specimens were manufactured then by feeding the prepared filaments into a desktop 3D printer. Mechanical, morphological and melt flow properties of the developed samples were determined. The addition of BA decreased the melt flow rate of PLA, however not so much that it would have hindered its suitability for 3D printing. With increasing BA content both the strength and the stiffness of the samples increased slightly at constant deformability and toughness. Scanning electron microscopic images revealed a homogenous dispersion of BA particles within the PLA matrix, although remaining agglomerates were also observed.
Advanced method for measuring slurry surface tension
Authors: Dzhambulatov R , Savvin V , Bataev D , Khasanov A , Uspazhiev R , Khasbulatova Z , Bagov A
Published: August 2020

The work is devoted to a method that makes it possible to level the influence of sedimentation on the surface tension of slurry. To do so the methods for measuring surface tension are used, where the sedimentation process is multidirectional relative to the surface under study. An analysis of the results shows that the proposed method can virtually eliminate the influence of sedimentation on the surface tension of dispersed systems with low kinetic stability. Using the proposed method, the concentration dependence of the surface tension of aqueous slurries of bentonite in the range of 0–20 mass% of the solid phase is studied.
Influence of various factors on the spreading kinetics
Authors: Novosadov V S , Dadashev R Kh , Kutuev R A , Elimkhanov D Z , Dadasheva Z I , Talkhigova Kh S
Published: August 2020

It was found that at the stage of fast spreading (τ≤ 0,02c) at constant driving force within the wetting perimeter, the following exerts the main impact on the spreading kinetics: inertial forces that prevent spreading and change their sign when the speed slows, viscous resistance forces, the influence of which increases in proportion to the growth of the thickness of the boundary layer and vertical forces, which begin to appear when the spreading velocity slows down.
Self-consistent model of fluid structure in volume and boundary layer
Authors: Novosadov V S , Dadashev R Kh , Kutuev R A , Elimkhanov D Z , Dadasheva Z I , Talkhigova Kh S
Published: August 2020

The study proposes the self-consistent theory that combines an activation model, a free volume model and a cluster model. The theory makes it possible to explain why the flow of fluid in slip conditions requires extremely minimal tangential stresses and describes the real structure of the fluid in the boundary layer, as well as to explain why the fluid is almost not squeezed out of the capillary gap.
Features of deformation and destruction of fine-grained fiber concrete
Authors: Maslennikov S A , Pashkova O A , Dmitrienko V A , Rud D O
Published: August 2020

The article analyzes the conditions of buildings construction in town Shakhty after the closure of coal mining enterprises. The appearance of deformation processes after old mine workings were flooded, is usually accompanied by uneven surface deformations and cracks formation in load-bearing structures is noted in the article. The positive effect of polypropylene microfiber additives on the deformation properties of Portland cement masonry solutions was studied, as it significantly reduces the probability of cracks in building structures. The results of experimental studies of mechanical properties of compositions with optimal dosage of polypropylene microfiber are presented. An increase in flexural and compressive strength of microfiber-modified samples was noted in comparison with the control ones. The dependence of ultimate deformations on normal stresses is established, which allows predicting the permissible ultimate deformations of masonry. The module of the total solution strain was evaluated.
Anomalous character of temperature dependences of some AgInSe2 parameters AgInSe2
Authors: Matiev A , Uspazhiev R , Khamkhoev B , Torshkhoeva Z , Blagina L , Gachaev A , Martazanova L , Evteeva R
Published: August 2020

Based on the experimental and X-ray studies of the absorption spectra and the temperature dependence of the crystal lattice parameters of AgInSe2 single crystals and the coefficients of thermal expansion along the corresponding crystallographic directions were calculated. It was found that the thermal expansion of AgInSe2 crystals along the a and c axes changes its sign at a temperature of 142.31 and 135, 14 K, respectively. The anomalous nature of the band gap width AgInSe2 was established.
Phase transformations and dielectric characteristics of FE-relaxor Sr0.75Ba0.25Nb2O6 ceramics and thin films
Authors: Pavlenko A V , Tolmachev G N , Stryukov D V , Alikhadzhiev S Kh , Aliev I M , Zhidel K M , Tsebaev S N , Dzhambulatov R S
Published: August 2020

In the paper the results of a structure and dielectric properties study of ferroelectric-relaxor Sr0.75Ba0.25Nb2O6 (SBN-75) ceramics and thin films with the structure of an unfilled tetragonal tungsten bronze have been presented. The existence of orientation domains in the SBN-75 film with rotation in the interface plane only by angles of ± 18.4° relative to the axes of the MgO substrate is revealed. In the tetragonal approximation, the unit cell parameters of the film (c = 3.948 Å and a = 12.49 Å) and its strain in comparison with the cell parameters of the ceramic sample have been determined.
External impacts on structure and relaxation properties of thermotropic liquid crystal copolyester
Authors: Zhukova G S , Radjabov Z R , Kurbanmagomedov A K , Boykova G V
Published: August 2020

The methods of thermally stimulated depolarization (TSD) and X-ray diffraction analysis were used to study the impact of electric and temperature fields on the relaxation properties, structure, and molecular mobility of a liquid crystal (LC) copolymer based on polyethylene terephthalate (PET) and n-hydroxybenzoic acid (n – HBA). It was shown that polarization in the LC state besides the main relaxation transition leads to the formation of additional high-temperature maximum on current thermograms of thermally stimulated depolarization (TSD). The data of X-ray diffraction analysis indicate a change in the orientation of mesogenic units after polarization in an electric field. The results were explained by the combined action of electric and temperature fields on the conformational structure of the liquid crystal copolyester, namely, a change in the degree of crystallinity of the studied copolyester under the influence of external fields.
Morphology of geophysical fields of Terek-Caspian trough and placement patterns of oil and gas structures
Authors: Abubakarova E A
Published: August 2020

The paper considers the characteristic morphological features of geophysical fields caused by fault tectonics of the Tersko-Caspian trough. The results of the interpretation of the gravitational and magnetic fields of the region using the Cascade 3D spectral-correlation analysis of data are presented. Computer technology made it possible to analyze three-dimensional digital geophysical information using the methods of a probabilistic-statistical approach. Linear positive anomalies of geophysical fields are identified that extend in the fault zones. A comparative analysis of the maps of transformants of the gravitational and magnetic fields and maps of oil and gas structures. Based on the results of comparative analysis, a dependence was established that characterizes the confinement of the known oil and gas deposits in the region to the zones of positive linear anomalies of geophysical fields of a sub-latitudinal strike.
Determination of multistoried buildings stiffness properties in the inverse dynamics solution
Authors: Sobolev V I , Sobolev I V , Druzhinina T Ya
Published: August 2020

The article is devoted to the development of methods and evaluation of the accuracy of determining the horizontal stiffness of multi-storey buildings basing on the results of instrumental measurements of the self-induced vibrations parameters carried out with the help of high-precision instruments. The proposed studies are extremely relevant in estimating the unsoundness degree of the buildings that have passed a certain period of operation or buildings that have been subjected to severe exposure. The use of dynamic methods of load-bearing structure condition analysis has undeniable advantages, since it excludes the need for a detailed examination, often associated with the necessity to open the enclosing structures and evict the residents of the building. The advantages of using this approach are particularly evident in the survey of a large array of residential buildings that are in heterogeneous operating conditions and require rapid results. The practical application of the methods was tested in the survey of the high-rise apartment buildings of 1-335 series in the city of Irkutsk. However, the need to use dynamic models of small dimension in the evaluation of stiffness parameters makes it inevitable and urgent to solve the problems of assessing the accuracy of such approximations.
Application of RAPID technology for well drilling
Authors: Guseynova E L
Published: August 2020

The article is devoted to multilateral drilling, it provides a brief history, relevance of application, development prospects, advantages. The history of the emergence and development of the unified international classification of multilateral wells the TAML is also described in detail. The article summarizes the characteristics of the six difficulty levels of the TAML Classification System. The use of advanced RAPID brand joints is described and analyzed in detail. Various designs of joints of the Rapid brand are considered. The authors also propose the construction of a multilateral well using a connector of the Rapid X type.
Cyclic impact on productive formations of high-viscosity oil deposits
Authors: Kotenev Yu A , Mukhametshin V Sh , Sultanov Sh Kh , Kotenev A Yu
Published: August 2020

It is shown that the priority condition for reliable forecasting of the cyclic impact on productive formations of high-viscosity oil is the joint research and study of rheological and filtration properties of high-viscosity oils, including thixotropic properties, as well as mathematical calculations to choose the right mode of the working fluid injection. For the Stepnoozerskoe field conditions, the optimal injection period is 10 days.
Accounting of time factor during bottomhole zone treatment
Authors: Mukhametshin V V , L Se Kuleshova
Published: August 2020

It was found that when treating the bottomhole zone with acid compositions preventing emulsification in terrigenous reservoirs, the time factor has a significant influence on the treatment efficiency, much more than the features of the geological structure of an objects. The algorithm, which allows reducing the negative influence of the time factor on the efficiency of oil production intensification by application of technological impact indices, is proposed. Geological-statistical models were obtained, which allow planning the treatment efficiency, selecting wells and technological treatment indicators taking into account the time factor in real time.
On the development of an experimental design and field test of an upper bit tool
Authors: Zaynagalina L Z
Published: August 2020

The design of upper bit tools has been developed. Such tools provide crushing, sifting and removal of slurry from the bottom when drilling vertical, deviated and horizontal wells with a roller cone bit. The analysis of slurry samples from directional and horizontal wells was carried out to determine rational geometric dimensions of the working channels of the upper bit tool. The design requirements of upper bit tool, ensuring the stability of its operation, are presented.
The actualization of the garden city model in modern urban planning with participation practices (on the example of Grabnyk park renewal in the city of Rivne)
Authors: Blinova M Y , Ilchenko S A
Published: August 2020

The participation practices in Ukrainian urban planning are a fairly new phenomenon. The growing interest in such approaches primarily reflects positive changes in the development of cities. On the other hand, this interest draws attention to problems of implementation of these approaches in actual urban planning practice. It is important to note here that although participation practices are well regulated in countries with developed democracy, under conditions of developing democracy in Ukraine there are still no well-functioning mechanisms of interaction between government and society at local levels. Regarding participation of local communities in city development, the discussion about the place of a professional architect in urban planning processes that include participation practices becomes particularly important. In this article we uncover effectiveness of participation practices and limitations of their application in the context of Ukraine. We also determine the differences in understanding effectiveness and limitations of these practices in Ukraine and developed democracies.
Sustainable Mobility in the Context of Humanization of the Urban Environment: a regional experience
Authors: Korshunova N N , Morozova E B , Dolinina O E
Published: August 2020

The purpose of the research is to identify modern approaches to the spatial development of Belarusian cities. The article focuses on the role of transit-oriented design in spatial development of cities. The principles of ‘green urban construction’ and their implementation in pilot projects for urban areas reconstruction in Polotsk-Novopolotsk agglomeration are considered. The introduction of developed territory transformation models into urban planning practice was suggested. The participation of Belarus in international initiatives and projects relating to urban and transport planning are assessed. Organizational and institutional prerequisites for using the European experience of mobility management have been established. The scientific novelty consists in the study of the concept of sustainable mobility as a tool for territorial development and humanization of the environment with a focus on the conditions in Belarus.
Problems of Architecture and Professional Development of an Architect beyond “Limits to Growth”
Authors: Fomenko O O , Danylov S M , Izbash A M
Published: August 2020

The study examines the regional specifics of the formation of architectural specializations under the influence of social and resource crises experienced by Ukraine. Based on the work of D. Meadows and J. Forrester (system dynamics) a method was developed for the formation of “Knots of problems” based on “positive and negative feedback loops”. Some “Knots of problems” and their influence on the formation of needs for architects and urbanists of the new generation were described on the example of Kharkiv. The identified needs are shaped by the acute socio-economic crisis experienced by the city. The authors argue that a focus on servicing territorial communities and developing strategies to enhance the role of society in creating an energy-efficient and environmentally positive architecture should be considered a prority in the work of architects of new formation. The research based on the identified socio-economic “Knot of Problems” describes its hermeneutic circle (a circle of interconnected systemic contradictions that prohibits the solution of identified problem). The analysis of the revealed “Circle” indicates that an achievement of a sustainable state by the cities of Ukraine is practically impossible without a significant increase in socialization in urban communities. The study focuses on the importance of universities and, in particular, architectural faculties, in the revival of territorial communities.