bluuebunny/crossref_metadata_2025 huggingface dataset:
The Synergistic Effect of Temperature and Loading Rate on Deformation for Thermoplastic Fiber Metal Laminates
Authors: Jin Kai , Xuan Shanyong , Tao Jie , Chen Yujie
Published: July 2021

The glass fiber reinforced polypropylene/AA2024 hybrid laminates (short for Al/Gf/PP laminates) as structural materials were prepared and formed by hot pressing. The synergistic effects of temperature and loading speed on the laminate deformation under tensile and bending conditions were investigated and analyzed in this study. In tension, stress–strain curves presented bimodal types effected by tensile rates and temperatures. The state of PP resin determines the mechanical behavior of the FMLs. The tensile rate has no effect on FML deformation without heating or over the melting point of PP resin (about 170 °C). The softening point of PP resin (about 100 °C) is characteristic temperature. When the temperature exceeds the softening point but does not reach the melting point, the tensile strength and elongation will demonstrate coordinated growth at a relatively high tensile speed. The efficiency of fiber bridging is affected significantly since the resin is the medium that transfers load from the metal to the fiber. Under bending, the curves presented a waterfall decrement with temperature increment. The softening point of resin matrix is the key in a bending process. When the temperature is near the softening point, deformation is sensitive to both the temperature and the loading speed to a certain extent. If temperature is lower than softening point, deformation is mainly guided by temperature. If the temperature is beyond the softening point, loading speed is in a leading position of deformation. The bending strength gradually increases with loading rate. By using these deformation characteristics, the deformation of the thermoplastic laminates can be controlled in stamping or other plastic forming processes for thermoplastic fiber metal laminates.
Microstructure and Properties of SUS304 Stainless Steel Joints Brazed with Electrodeposited Ni-Cr-P Alloy Coatings
Authors: Liu Shubin , Shohji Ikuo , Kobayashi Tatsuya , Osanai Katsuharu , Ando Tetsuya , Hirohashi Junichiro , Wake Tsunehito , Inoue Katsufumi , Yamamoto Hiroki
Published: July 2021

In this study, an amorphous Ni-13.4Cr-11.6P (mass%) alloy coating with a thickness of 30 μm was deposited on the surface of SUS304 stainless steel as a brazing filler metal to conduct brazing. The differential thermal analysis measurements indicate that the electrodeposited Ni-13.4Cr-11.6P alloy has a melting point of approximately 892 °C, which is almost consistent with that of the commercial BNi-7 filler metal. The microstructure, shear strength, and fracture mode of the brazed joint were investigated using an electron probe X-ray microanalyzer, a scanning electron microscope, an optical microscope, and a universal testing machine. The results showed that the brazed filler metal is filled between the SUS304 stainless steel plates without any flaws in the brazed seam. The P-containing phases, i.e., the Cr-P rich phase and the (Ni,Fe)3P phase, were formed in the brazed seam. The shear strength of the brazed joint obtained in this study is 59.0 MPa. The fracture occurs in the brazed filler zone, where the brittle P-containing phases are present. Galvanic current measurement results showed that the brazed Ni-13.4Cr-11.6P alloy coating has a better corrosion resistance than that of the brazed Ni-11P alloy coating, which can be attributed to the formation of a large amount of Ni-Fe solid solution and Cr-P rich phase in the top layer of the brazed Ni-13.4Cr-11.6P alloy coating.
Mechanical Properties of Compact Bone Defined by the Stress-Strain Curve Measured Using Uniaxial Tensile Test: A Concise Review and Practical Guide
Authors: Lin Che-Yu , Kang Jiunn-Horng
Published: July 2021

Mechanical properties are crucial parameters for scaffold design for bone tissue engineering; therefore, it is important to understand the definitions of the mechanical properties of bones and relevant analysis methods, such that tissue engineers can use this information to properly design the mechanical properties of scaffolds for bone tissue engineering. The main purpose of this article is to provide a review and practical guide to understand and analyze the mechanical properties of compact bone that can be defined and extracted from the stress–strain curve measured using uniaxial tensile test until failure. The typical stress–strain curve of compact bone measured using uniaxial tensile test until failure is a bilinear, monotonically increasing curve. The associated mechanical properties can be obtained by analyzing this bilinear stress–strain curve. In this article, a computer programming code for analyzing the bilinear stress–strain curve of compact bone for quantifying the associated mechanical properties is provided, such that the readers can use this computer code to perform the analysis directly. In addition to being applied to compact bone, the information provided by this article can also be applied to quantify the mechanical properties of any material having a bilinear stress–strain curve, such as a whole bone, some metals and biomaterials. The information provided by this article can be applied by tissue engineers, such that they can have a reference to properly design the mechanical properties of scaffolds for bone tissue engineering. The information can also be applied by researchers in biomechanics and orthopedics to compare the mechanical properties of bones in different physiological or pathological conditions.
An Economic Model for OECD Economies with Truncated M-Derivatives: Exact Solutions and Simulations
Authors: Quezada-Téllez Luis A. , Fernández-Anaya Guillermo , Brun-Battistini Dominique , Nuñez-Zavala Benjamín , Macías-Díaz Jorge E.
Published: July 2021

This article proposes two conformal Solow models (with and without migration), accompanied by simulations for six Organisation for Economic Co-operation and Development economies. The models are proposed by employing suitable Inada conditions on the Cobb–Douglas function and making use of the truncated M-derivative for the Mittag–Leffler function. In the exact solutions derived in this manuscript, two new parameters play an important role in the convergence towards, or the divergence from, the steady state of capital and per capita product. The economical dynamics of these nations are influenced by the intensity of the capital and labor factors, as well as the level of depreciation, the labor force rate and the level of saving.
Changes in Consumers’ Purchase Patterns as a Consequence of the COVID-19 Pandemic
Authors: Valaskova Katarina , Durana Pavol , Adamko Peter
Published: July 2021

The current COVID-19 pandemic has affected every aspect of consumer behavior—their expenses, investments, and financial reserves, as well as their financial and social wellbeing. As a consequence of different restrictions, consumers and their shopping patterns have changed significantly; thus, the factors that influence new purchase patterns need to be identified to help traders, retailers, and marketers develop appropriate strategies to respond to crucial consumer changes in the market. A categorical analysis (Pearson’s chi-square test) and correspondence analysis (simple and multivariate) were applied to a sample of 425 Slovak respondents to reveal the most important factors impacting consumers’ financial situations, as well as the effects on the maintenance of new shopping habits established during the pandemic period. The results revealed that consumers’ income, age, and sector of occupation play important roles in the context of new shopping patterns. These findings are in agreement with other global studies, confirming both the worldwide impact of the pandemic on consumer behavior and the importance of national studies on consumer shopping behavior in order for state authorities, traders, marketers, and entrepreneurs to be able to take necessary measures.
Malignant Gastric Outlet Obstruction Caused by Duodenal Cervix Metastasis in a Young Woman: Rendezvous Technique
Authors: Marra Ester , Quassone Pasquale , Tammaro Pasquale , Cardalesi Cinzia , D’Avino Raffaele , Cipolletta Fabio , Del Prete Anna , Travaglino Angela , Tamburrini Stefania , Ferrandino Giovanni , Sarti Giuseppe , Iannuzzi Michele , Maida Pietro , Santini Gianpaolo
Published: July 2021

Background: Malignant gastric outlet obstruction (MGOD) is an extremely rare expression of advanced extra-gastrointestinal cancer, such as squamous cell carcinoma (SCC) of the cervix, and only sixcases are described in the literature.Because of the short life expectancyand the high surgical risk involving these patients, less invasive approaches have been developed over time, such asthe use of an enteral stent or less invasive surgical techniques (i.e., laparoscopic gastrojejunostomy). However, MGOD could make it difficult to perform an endoscopic retrograde cholangio-pancreatography (ERCP) for standard endoscopic drainage, so in this case a combined endoscopic-percutaneous technique may be performed. This article, therefore, aims to highlight the presence in the doctor’s armamentarium of the “rendezvous technique”, few case reports of whichare described in the literature, and, moreover, this article aims to underline the technique’sfeasibility. Case Presentation: The case is that of a 38-year-old woman who presented with MGOD three years after the diagnosis of SCC of the cervix, who successfully underwent the rendezvous technique with the resolution of duodenal obstruction. Endoscopic enteral stenting treatment with the placement of a metal stent (SEMSs) represents the mainstay of MGOD treatment compared withsurgery due to its lower morbidity, mortality, shorter hospitalization and earlier symptom relief. However, in patients with both duodenal and biliary obstruction, a combined endoscopic–percutaneous approach may be necessary because of the difficulty in passing the duodenal stricture or in accessing the papilla through the mesh of the duodenal SEMS. Conclusion: The rendezvous procedure is a technicallyfeasible and minimally invasive approach to the double stenting of biliary and duodenal strictures. It achieves the desired therapeutic result while avoiding the need to perform more invasive procedures that could have a negative impact on the patient’sprognosis.
The Use of Virtual Therapy in Cardiac Rehabilitation of Female Patients with Heart Disease
Authors: Jóźwik Sandra , Cieślik Błażej , Gajda Robert , Szczepańska-Gieracha Joanna
Published: July 2021

Background and Objectives: Cardiovascular disease (CVD) has become increasingly prevalent in women, and it is also in this group that the risk of developing depression is the highest. The most commonly applied therapeutic intervention in cardiac rehabilitation is Schultz’s autogenic training, which has proven to be of little efficacy in reducing depression and anxiety disorders. At the same time, a growing number of scientific reports have been looking at the use of virtual reality (VR) to treat mental health problems. This study aimed at assessing the efficacy of virtual therapy in reducing levels of depression, anxiety, and stress in female CVD patients. Materials and Methods: The study included 43 women who were randomly divided into two groups: experimental group (N = 17), where eight-week cardiac rehabilitation was enhanced with VR-based therapeutic sessions, and control group (N = 26), where the VR therapy was replaced with Schultz’s autogenic training. Mental state parameters were measured using the Perception of Stress Questionnaire and Hospital Anxiety and Depression Scale (HADS). Results: In the experimental group, the sole parameter which failed to improve was HADS-Anxiety, which remained at the baseline level. In the control group, there was a deterioration in nearly all tested parameters except for HADS-Depression. Statistically significant differences in the efficacy of rehabilitation were recorded in relation to the level of stress in the sub-scales: emotional tension (p = 0.005), external stress (p = 0.012), intrapsychic stress (p = 0.023) and the generalized stress scale (p = 0.004). Conclusions: VR therapy is an efficient and interesting complement to cardiac rehabilitation, with proven efficacy in reducing stress levels.
Effects of Lactobacillus salivarius LN12 in Combination with Amoxicillin and Clarithromycin on Helicobacter pylori Biofilm In Vitro
Authors: Jin Fang , Yang Hong
Published: July 2021

Helicobacter pylori is a highly prevalent and harmful gastrointestinal pathogen. Antibiotic resistance and biofilm complexity have led to a decrease in the cure rate. Probiotics are considered to be an adjuvant therapy for clinical Helicobacter pylori infections. However, there is no substantial explanation for the adjuvant role of probiotics on H. pylori biofilm. In this study, the effects of probiotics in combination with amoxicillin (AMX) and clarithromycin (CLR) on H. pylori biofilms were explored in vitro for the first time. The minimum inhibitory concentration (MIC) and the fractional inhibitory concentration (FIC) for H. pylori was determined by the microbroth dilution method, and the plate counting method was used to determine the minimum biofilm removal concentration (MBEC) and survival rate for H. pylori biofilm. The biofilm structure was observed by scanning electron microscopy (SEM) and confocal laser scanning microscopy (CLSM), protein and polysaccharide contents in extracellular polymeric substances (EPS) were determined by the Bradford method and the phenol-sulfate method, respectively. The gene expression levels of cagA and vacA were evaluated by real-time qPCR. Among the ten H. pylori strains, the clinical strain 3192 showed the strongest film-forming ability, the 3192 biofilms significantly improved the resistance to AMX and CLR, and AMX and CLR showed antagonistic effects on planktonic 3192 cells. When the Lactobacillus salivarius LN12 cell-free supernatant (CFS) was in combination with AMX and CLR, the 3192 biofilm structure was destroyed to a greater extent than when separately; more biofilm biomass and protein in EPS was decreased; and the downregulation effect of the virulence gene vacA was also greater than that of single use. In this study, we suggest that the addition of LN12 to AMX and CLR may enhance the therapeutic effect of triple therapy, especially for the treatment of H. pylori biofilms.
Nonlinear Dynamics of Two-State Quantum Dot Lasers under Optical Feedback
Authors: Wang Xiang-Hui , Wu Zheng-Mao , Jiang Zai-Fu , Xia Guang-Qiong
Published: July 2021

A modified rate equation model was presented to theoretically investigate the nonlinear dynamics of solitary two-state quantum dot lasers (TSQDLs) under optical feedback. The simulated results showed that, for a TSQDL biased at a relatively high current, the ground-state (GS) and excited-state (ES) lasing of the TSQDL can be stimulated simultaneously. After introducing optical feedback, both GS lasing and ES lasing can exhibit rich nonlinear dynamic states including steady state (S), period one (P1), period two (P2), multi-period (MP), and chaotic (C) state under different feedback strength and phase offset, respectively, and the dynamic states for the two lasing types are always identical. Furthermore, the influences of the linewidth enhancement factor (LEF) on the nonlinear dynamical state distribution of TSQDLs in the parameter space of feedback strength and phase offset were also analyzed. For a TSQDL with a larger LEF, much more dynamical states can be observed, and the parameter regions for two lasing types operating at chaotic state are widened after introducing optical feedback.
Green Synthesis of Silver Nanoparticles Using Extract of Artemisia absinthium L., Humulus lupulus L. and Thymus vulgaris L., Physico-Chemical Characterization, Antimicrobial and Antioxidant Activity
Authors: Balciunaitiene Aiste , Viskelis Pranas , Viskelis Jonas , Streimikyte Paulina , Liaudanskas Mindaugas , Bartkiene Elena , Zavistanaviciute Paulina , Zokaityte Egle , Starkute Vytaute , Ruzauskas Modestas , Lele Vita
Published: July 2021

The novelty of this study is twofold: AgNPs were obtained and characterized using Artemisia absinthium (A. absinthium), Humulus lupulus (H. lupulus), and Thymus vulgaris (T. vulgaris) plants extracts; moreover, a green and environmentally friendly approach for the synthesis of silver nanoparticles (AgNPs) using aqueous extracts was developed. This paper discusses new approaches about the synthesis of AgNPs. T. vulgaris, H. lupulus, and A. absinthium, which are renewable and common plants, perfect as reducing, stabilizing, and capping agent for green synthesis of silver nanoparticles (AgNPs). The extracts and synthesized AgNPs were characterized by various physico-chemical, phytochemical, morphological scanning electron microscope (SEM/EDS) and transmission electron microscope scanning (TEM), and antibacterial activity. The antioxidant activity of extracts and AgNPs were also assessed by 2,2′-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) (ABTS•+), 2,2-diphenyl-1-picrylhydrazyl (DPPH•), cupric reducing antioxidant capacity (CUPRAC), ferric reducing antioxidant power (FRAP), and trifluoperazine dihydrochloride (TFPH•) scavenging assays. Extracts/AgNPs showed significant antioxidant activity in all cases. A. absinthium/AgNPs, H. lupulus/AgNPs, and T. vulgaris /AgNPs displayed activities against DPPH• (0.14 ± 0.00; 0.11 ± 0.00 and 0.14 ± 0.00 mmol/g), ABTS•+ (0.55 ± 0.05; 0.86 ± 0.05 and 0.55 ± 0.05 mmol/g), respectively. TEM analysis confirmed the average particle size, it estimated t A. absinthium/AgNPs–46 nm, H. lupulus/AgNPs size of synthesized particles was 42 nm and T. vulgaris/AgNPs–48 nm. SEM analysis revealed that T. vulgaris/AgNPs showed in solitary cases as snowflake-like, branched, but in a general spheric shape, H. lupulus/AgNPs were wedge-shaped, and A. absinthium/AgNPs were the spherical shape of the synthesized AgNPs. EDS analysis confirmed the purity of the synthesized AgNPs with a strong signal at 3.2 keV. A. absinthium/AgNPs, H. lupulus/AgNPs, and T. vulgaris/AgNPs exhibited higher antibacterial activity against all tested bacterial strains compared to their respective pure extracts. It is concluded that AgNPs synthesized in extracts have a broad range of biological applications, which can be used as an eco-friendly material without having negative effects on the environment.
The Potential of Satellite Sounding Observations for Deriving Atmospheric Wind in All-Weather Conditions
Authors: Zhang Yijia , Hu Hao , Weng Fuzhong
Published: July 2021

Atmospheric wind is an essential parameter in the global observing system. In this study, the water vapor field in Typhoon Lekima and its surrounding areas simulated by the Weather Research and Forecasting (WRF) model is utilized to track the atmospheric motion wind through the Farneback Optical Flow (OF) algorithm. A series of experiments are conducted to investigate the influence of temporal and spatial resolutions on the errors of tracked winds. It is shown that the wind accuracy from tracking the specific humidity is higher than that from tracking the relative humidity. For fast-evolving weather systems such as typhoons, the shorter time step allows for more accurate wind retrievals, whereas for slow to moderate evolving weather conditions, the longer time step is needed for smaller retrieval errors. Compared to the traditional atmospheric motion vectors (AMVs) algorithm, the Farneback OF wind algorithm achieves a pixel-wise feature tracking and obtains a higher spatial resolution of wind field. It also works well under some special circumstances such as very low water vapor content or the region where the wind direction is parallel to the moisture gradient direction. This study has some significant implications for the configuration of satellite microwave sounding missions through their derived water vapor fields. The required temporal and spatial resolutions in the OF algorithm critically determine the satellite revisiting time and the field of view size. The brightness temperature (BT) simulated through Community Radiative Transfer Model (CRTM) is also used to track winds. It is shown that the error of tracking BT is generally larger than that of tracking water vapor. This increased error may result from the uncertainty in simulations of brightness temperatures at 183 GHz.
Efficiency of investment activities of insurance companies in the framework of state investment policy
Authors: Kolobov A.
Published: July 2021

The article defines the essence of the investment activities of insurance companies. The peculiarities of the investment activity of insurance companies. Substantiates the basic problems of investment activity of insurance companies and offered possible solutions. The contribution of the insurance sector in the formation of investment resources. Directions of perfection of state regulation of investment activity of insurance companies in Russia.
Is it necessary to change the mechanism of transfer of unclaimed land shares to municipalities that has been in effect since 2011?
Authors: Lipski S.A.
Published: July 2021

The purpose of the article is to investigate the mechanism of transfer of unclaimed land shares to municipalities that has been used since 2011, and consider what results have been achieved and what difficulties have been taken place during implementation. The author realized that the transfer of unclaimed land shares to municipal property resolving the problem of shared ownership in general.
The analytical review of real estate accounting and registration systems considering the “Smart city” paradigm
Authors: Shapovalov D.A. , Beglyarov N.S.
Published: July 2021

The article examines publication activity, and provides a general overview of key scientific and technological features and also analyses domestic and foreign research in the field of land management. The conclusions highlight the focus of the Russian scientific community and propose the ideas for development prospects of this field.
Microbiota of the aquatic environment and rainbow trout when grown in the RAS
Authors: Shakirova Firdauz Mubarakovna , Govorkova Lada Konstantinovna , Anokhina Olga Konstantinovna , Valieva Guzel Damirovna
Published: July 2021

Fish production in closed systems is an intensive way of fish farming. However, keeping fish in plants with a closed water supply does not solve the problem of diseases in aquaculture facilities. The greatest damage is caused by bacterial diseases. In this regard, the study of the sanitary state of the aquatic environment of fish is relevant. The article provides information on the physicochemical parameters of water, the species composition of the microflora of the aquatic environment in the basin, microbiological indicators of the sanitary state of water, the total microbial count (TMC) and the number of bacteria of the E. coli group (BCGC) in the RAS when growing rainbow trout. Sanitary indicators of water quality in the pool, both in the first days of keeping rainbow trout, and after a week were within the normal range. There was only a numerical increase in the total microbial number and bacteria of the E. coli group in water samples taken after a week of finding the trout in the pools. According to the results of a study of the contamination of the skin and gills of rainbow trout, as well as the water in which it is contained, an increase in time was revealed from 69 to 73 CFU/ml on the skin and from 85 to 89 CFU/ml on the gills within a week. The qualitative composition of the microflora of the skin and gills of rainbow trout is represented by bacteria of the genera Aeromonas, Pseudomonas, Bacillus, Enterobacter, which is similar to the qualitative composition of the microflora of water. The study of the intestinal microflora of rainbow trout revealed that it also contains bacteria of the genera Aeromonas, Pseudomonas, Bacillus, Enterobacter. At the same time, lactic acid, streptococcal, staphylococcal bacteria, yeast-like fungi of the genus Candida were found, which are normal representatives of the intestinal microflora in small quantities.
The current status of aquatic biological resources and their habitat cross-border section in the Dnieper river within the Smolensk region Russian Federation and the Republic of Belarus
Authors: Nikitenko Alexey Ivanovich , Goryachev Dmitry Vladimirovich , Kostousov Vladimir Gennadlevich , Prischepov Georgy Prokofievich , Rizevsky Viktor Kazimirovich , Korabelnikova Olga Valerevna , Klets Natali Nikolaevna
Published: July 2021

The study presents materials on the status of aquatic biological resources and their habitat in the Dnieper River within the territory of the Russian and the Belarus. In the recent period, there has been hardly any complex fishery research in the upper reach of the river within the boundaries of the Smolensk Region due to the lack of commercial fishing; the same can be applied to the reach of the river within the Vitebsk Region in Belarus. The collection of materials and scientific and research accounting network surveys for monitoring the state of aquatic bioresources were carried out on the Dnieper River as part of the research in 2019 according to a preplanned grid of stations. When fishing for scientific research purposes, 20 net-stops of smooth frame nets were made in the Russian section, and 9 net-stops were made in the Belarusian section. In the Russian section of the Dnieper River, the species composition was 16 species of fish, and in the Belarusian section — 22 species. The main catch in the Russian section is roach 29% and chub 20%, in the Belarusian section bream — from 3 to 46%, roach — from 19 to 63% and gustera — from 1.8 to 33%, in a slightly smaller number of river perch (on average up to 10%). The share value of roach and guster tends to decrease from the upper to the lower areas, bream-on the contrary to increase, the value of perch is approximately equal in all areas. In the size structure of the caught fish species, there is a dynamic with a good reproductive potential.
JUSTIFICATION OF THE DESIGN SEQUENCE COMBINED SUPPORTS WITH VARIABLE CHARACTERISTICS
Authors: BONDARENKO M.E. , POLYAKOV R.N. , GORIN A.V. , RODICHEVA I.V.
Published: July 2021

The article presents the sequence of calculating a combined support with variable parameters in the form of an algorithm. The application of the graphical editor of the CAE–system APM Win Shaft for modeling a rotor rotating in combined supports with variable characteristics is described. The results of the calculation module are presented. The obtained Kembel diagrams are considered. An analysis is given to the switching diagrams of a combined support with variable characteristics during operation in transient processes according to a certain algorithm. The presented algorithm eliminates the possibility of increasing the amplitude of oscillations when passing through critical frequencies. Conclusions are drawn about the effectiveness of using the specified sequence of calculations Recommendations are given on the use of the proposed calculation sequence for the design of similar combined supports with variable characteristics.
INFLUENCE OF THE CURRENT PULSE SHAPE ON THE DYNAMICS OF THE TEMPERATURE FIELD OF THE THERMOELECTRIC COOLER BRANCH
Authors: MARKOV O.I.
Published: July 2021

Numerical simulation of thermoelectric processes in a branch of a solid–state thermoelectric Peltier cooler in a non–stationary mode is performed. Some examples show the effect of changes in the amplitude of the current pulse over time on the temperature in the branch of the thermoelectric element.
DEVELOPMENT OF MANIFACTURING TECHNOLOGY AND PRODUCTION OF AN IMPORT–SUBSTITUTING MULTIFUNCTIONAL COCHLEAR IMPLANTATION SYSTEM FOR THE REHABILITATION OF PATIENTS WITH SENSORINEURAL HEARING LOSS
Authors: EGOROV A.I. , GLUKHOVSKIY E.M.
Published: July 2021

This article deals with the results of work on the creation of an import–substituting technology for the production of domestic cochlear implants. Cochlear implantation is considered as a radical method for solving hearing problems, both in children and in the elderly. The experience of domestic operations was analyzed by interviewing patients who underwent the procedure of cochlear implantation. To solve the research problem, we analyzed the accumulated experience of domestic operations by interviewing patients who underwent the procedure of cochlear implantation. We will highlight the criteria for the success of improving the quality of life of patients, and we found a correlation between the success of improving the quality of life of a patient after surgery with the characteristics of the implant used. Based on the analysis of these correlations and a detailed study at the laboratory bench of the implant that most contributed to the improvement of the quality of life of patients, we proposed a configuration of a domestic device designed to replace a foreign analogue in medical practice.
ANALYSIS AND RESEARCH OF OPERATIONAL AND TECHNOLOGICAL RELIABILITY OF EQUIPMENT FOR INTERNAL SMALL–SIZED THREADING
Authors: KHARCHENKO A.O. , VLADETSKAYA E.A.
Published: July 2021

The article presents the results of analysis and research in the direction of improving technological equipment for internal threading of parts in a flexible automated production. Methods for assessing the operational and technological reliability of a flexible manufacturing module (FMM) of thread processing are considered, which can be used as the basis for the developed method of synthesis of its elements. It is proposed to consider the technological system of the flexible manufacturing module (FMM) of thread processing as a system in which transitions from state to state occur under the action of the simplest flows with parameters of the transition probabilities of a continuous Markov chain. The developed mathematical model describing the state of the FMM taking into account the failures of the functioning of its elements, parametric failures, as well as taking into account the recovery after these types of failures, makes it possible to reflect the influence on the operation of the module of the parameters of the flows of failures and restorations of the tool, machine tool, fixture, loading device. The solution of the obtained systems of equations of final probabilities allows for given (or experimentally obtained) intensities of failure streams (functioning and parametric) for FMM threading to obtain the values of the probability of failure–free operation, as well as the probabilities of finding the system in an inoperative state due to corresponding failures. The measures taken make it possible to solve the synthesis problem at the level of structural and layout optimization, so that at the stage of parametric synthesis to determine the elements that are vulnerable according to the developed criterion, the improvement of which will lead to the creation of the most efficient system.
REDUCTION OF ERRORS IN THE PROFILE OF THE TEETH OF GEARS IN THE PROCESSES OF GEAR MILLING WITH WORM CUTTERS
Authors: SAFAROV D.T. , KONDRASHOV A.G.
Published: July 2021

The article considers an approach to reducing the errors of the involute and longitudinal profiles of gears. The reduction of the profile error consists of several steps – evaluation of indicators relative to the limit values, identification of the technological structure, expert analysis of profilograms, which results in the content of corrective actions. Constant repetition of steps leads to a constant reduction of the most significant profile errors, which significantly reduces the risks of manufacturing wheels with inappropriate profile errors. The scheme is universal and can be used for any tooth processing operations. The article deals with the reduction of the error of profiles on the example of gear milling of cylindrical skew–toothed wheels with a worm gear cutter.
Shelf Life of Modified Atmosphere Packaged Fresh Grouper (Epinephelus sp.) Fillets
Authors: SIAH W.M. , ARIFF W. MOHD
Published: July 2021

The effect of two modified atmosphere (MA) conditions (80% CO2 : 20% N2 and 60% CO2 : 40% N2) on the shelf life of grouper fillets (Epinephelus sp.) stored at refrigeration temperature (2 ± 2 oC) were studied. Chemical and microbiological changes, and sensory alterations were monitored. Values were compared with those obtained from 100% air-stored samples. Modified atmosphere conditions slowed down the deterioration rate of grouper fillets. Results from chemical and microbiological analyses showed that fillets under MA were significantly better than those under 100% air-stored fillets throughout all storage periods, and sensory properties scored significantly (p<0.05) higher. The shelf life of fillets packaged in 80% CO2 : 20% N2 and 60% CO2 : 40% N2 were 18 and 14 days respectively, and seven days for 100% air-stored fillets.
Effects of Staining and Streamer Tags on Survival and Growth of Juvenile School Prawns, Metapenaeus macleayi, Under Laboratory Conditions
Authors: WALSH C.T. , MONTGOMERY S.S. , REID D.D. , MCLEOD J.R.
Published: July 2021

Juvenile school prawns from two size classes (carapace length 11-20mm and 21- 30mm) were marked with a stain (fast green FCF solution) or tagged with steamer tags under laboratory conditions to test the hypothesis that tagging or marking affects the survival and/or growth of prawns. The stain accumulated in all parts of the prawn, but after 14 days it was visible only in the gills. All surviving tagged prawns at the end of each experiment had their streamer tags intact with tag information still visible. Tagging and staining significantly reduced survival, but there was no significant difference in mortality (40-50%) between these two techniques. Mortality was at its highest for all treatments in the first week of the experiments, reflecting the stress associated with handling the prawn and applying the tag or stain. Mortality was not size- or sex-dependent and marking or tagging did not appear to affect growth. While the low survival rates are of concern, this laboratory study suggests that streamer tags are the most suitable method for use in mark-recapture population studies for juvenile school prawns.
Growth Performance of GMT and Mixed Sex Nile Tilapia Oreochromis niloticus on Natural and Supplemental Feeds
Authors: PERSCHBACHER P.W.
Published: July 2021

Attention has been focused on genetically-improved stocks and strains of tilapia. A greenhouse recirculating aquaculture system (RAS) of three 540 L tanks stocked with 100 37.2 g genetically male tilapia (GMT) Nile tilapia, Oreochromis niloticus, and three identical tanks with the same number of 38.1 g mixed sex Nile tilapia, was used to measure response to floating 3.0 mm catfish pellets (32 % protein) fed once per day at four different rates based on body weight day-1 (2-4 % BW day-1). Feed rate and amount were changed every 14 days based on growth measurements. For growth comparisons on natural feeds (primarily phytoplankton), two 10.5 m3 net pens were each stocked in August with 105 7.7 g Nile tilapia m-3 of each group in each of two 1.0 ha blue catfish Ictalurus furcatus fingerling ponds and not fed. Fish were harvested in November. GMT fish outperformed mixed sex fish on both feed sources, and at most feed rates. In RAS trials at 2, 2.5, 3.0 and 4.0 % BW feeding, percentage growth day-1 was 1.95, 2.11, 2.21 and 3.31 for GMT, and 1.60, 2.22, 1.97 and 2.86 for mixed sex; and the associated food conversion ratio (FCR) was 1.54, 1.37, 1.37 and 1.04 and 1.64, 1.35, 1.42 and 1.20, respectively. At harvest in net pens, GMT fish were 25 % larger than mixed sex. Growth was 1.3 and 1.0 g day-1 on natural food sources for GMT and mixed sex, respectively.
Customer Satisfaction From The Services of Retailing Markets: A Model Proposal With Multiple Logistic Regression
Authors: ŞENGÜN Halil İbrahim , MENTEŞ Nurettin
Published: July 2021

As time passes, purchasing habits of consumers have been changing constantly. Consumption has become a phenomenon that turned into madness due to the acceleration of aggressive sales enhancing efforts based on fierce competition and to the fact that consumers confuse the concepts of need and desire. Confronting the consumers with easily reachable products and broad distribution channels, markets are vital institutions for people. The first aim of this study is to determine the factors increasing and decreasing customer satisfaction. The second aim is to determine whether there is a meaningful correlation between markets and demographic elements. To this end, perceptions of 407 consumers in Diyarbakir who were chosen by convenience sampling method were measured by face-to-face questions. Then their answers were subjected to frequency analysis and chi-square test. In addition, multiple logistic regression analysis has been utilized to see the model. As a result of the study, meaningful differences have been found between consumers’ gender and marital status according to the markets they choose to shop. For the proposed model, gender of the customer, gender of the cashier, convenience of entering and exiting the market and satisfaction from hygiene of the market have become prominent variables increasing the satisfaction from retailing.
Örgütlerde Davranışsal Karar Ölçeği: Geçerlilik ve Güvenirlik Çalışması
Authors: GÜLER Sevilay , TUTAR Hasan , AKBOLAT Mahmut
Published: July 2021

Bu çalışmanın temel amacı, işgören davranışlarını örgüt yanlısı yaklaşımların yanında, alternatif kuramların varsayımları üzerinden incelemeye yönelik bir ölçek geliştirmektir. Bu amaçla örgüt yanlısı yaklaşımlara eleştirel bir bakış açısı geliştirmek amaçlanmıştır. Bu amaçla konuyla doğrudan ilişkili olduğu düşünülen davranışsal iktisat kuramlarında ileri sürülen insan davranışları perspektifinde ölçek geliştirme çalışması yapılmıştır. Örgütlerde Davranışsal Karar Ölçeği (ÖDKÖ) ile örgüt yanlısı yaklaşımların alternatif kuramlar tarafından incelenmesi amaçlanmıştır. Araştırma 542 kişiden oluşan bir örneklemden elde edilen verilerle yapılmıştır. Verilerin analizinde keşfedici faktör analizi ve doğrulayıcı faktör analizi kullanılmıştır. Keşfedici faktör analizi sonucunda toplam 35 madde ve beş alt boyuttan oluşan bir ölçek elde edilmiştir. Ortaya çıkan alt boyutlar; rasyonellik, sezgisellik, benlik saygısı, betimsellik ve normatiflik olarak adlandırılmıştır. Doğrulayıcı faktör analizi sonucunda elde edilen bulgular ölçeğin kabul edilebilir uyum değerlerine sahip olduğunu göstermiştir. Ölçeğin güvenirliği için 0,968 olarak hesaplanan Cronbach Alfa kat sayısı ölçeğin oldukça güvenilir olduğunu göstermektedir. Analiz bulgularına göre Örgütlerde Davranışsal Karar Ölçeği, işgörenlerin davranışsal kararlarının analizinde kullanılabilecek geçerli ve güvenilir bir ölçme aracıdır.
PROPERTIES OF LIGNIN MICROPARTICLES PREPARED BY MECHANICAL TREATMENT
Authors: DE OLIVEIRA BEGALI DANIELLY , SALGADO DE OLIVEIRA ANA CAROLINA , FONSECA FERREIRA LAURA , DE OLIVEIRA CASSIANO RODRIGUES , BATISTA LUIS ROBERTO , DE ASSIS ODÍLIO BENEDITO GARRIDO , YOSHIDA MARIA IRENE , VILELA BORGES SORAIA
Published: July 2021

The present study aimed to obtain Kraft lignin microparticles by mechanical treatment and compare them with initial Kraft lignin in terms of their chemical, thermal and structural properties, as well as possible antioxidant and antimicrobial effects. Ball milling reduced the particle size from 6.6 µm to 3.1 µm. The zeta potential and polydispersity index measurements revealed greater instability of the microparticles, with a higher tendency to agglomerate, and higher homogeneity, when compared with Kraft lignin. These findings were also evidenced by scanning electron microscopy. The thermal degradation behavior was not affected by the mechanical treatment utilized in the production of microparticles. X-ray diffraction showed crystalline and amorphous regions in the particles. Infrared spectroscopy revealed that the microparticles maintained the characteristic peaks of Kraft lignin, with lower peak intensity. The samples proved high antioxidant potential, as determined by the 2,2-diphenyl-1-picryl-hydrazyl assay, regardless of the concentration studied. Therefore, the results of the study demonstrated that the obtained Kraft lignin microparticles could be suitable for the development of antioxidant food packaging.
CELLULOSIC BIOETHANOL PRODUCTION FROM ULVA LACTUCA MACROALGAE
Authors: ALLOUACHE AMINA , MAJDA AZIZA , TOUDERT AHMED ZAID , AMRANE ABDELTIF , BALLESTEROS MERCEDES
Published: July 2021

Nowadays, the use of biofuels has become an unavoidable solution to the depletion of fossil fuels and global warming. The controversy over the use of food crops for the production of the first-generation biofuels and deforestation caused by the second-generation ones has forced the transition to the third generation of biofuels, which avoids the use of arable land and edible products, and does not threaten biodiversity. This generation is based on the marine and freshwater biomass, which has the advantages of being abundant or even invasive, easy to cultivate and having a good energetic potential. Bioethanol production from Ulva lactuca, a local marine macroalgae collected from the west coast of Algiers, was examined in this study. Ulva lactuca showed a good energetic potential due to its carbohydrate-rich content: 9.57% of cellulose, 6.9% of hemicellulose and low lignin content of 5.11%. Ethanol was produced following the separate hydrolysis and fermentation process (SHF), preceded by a thermal acid pretreatment at 120 °C during 15 min. Enzymatic hydrolysis was performed using a commercial cellulase (Celluclast 1.5 L), which saccharified the cellulose contained in the green seaweed, releasing about 85.01% of the total glucose, corresponding to 7.21 g/L after 96 h of enzymatic hydrolysis at pH 5 and 45 °C. About 3.52 g/L of ethanol was produced after 48 h of fermentation using Saccharomyces cerevisiae at 30 °C and pH 5, leading to a high ethanol yield of 0.41 g of ethanol/g of glucose.
WASTEWATER TREATMENT USING A MODIFIED CELLULOSE ACETATE MEMBRANE
Authors: ABURIDEH HANANE , TIGRINE ZAHIA , ZIOUI DJAMILA , HOUT SARAH , TASSALIT DJILALI , ABBAS MOHAMED
Published: July 2021

The main objective of this work has been to study the performance of membranes developed for treating purified wastewater. Polymeric membranes have been developed from solutions containing cellulose acetate (AC) and polysulfone (PSF), using N,N-dimethylformamide (DMF) as solvent and polyethylene glycol (PEG) as additive. The phase inversion method was chosen as a technique for producing the membrane films. The incorporation of PEG allowed us to study the effect of the additive on the morphological structure, and to predict the performance of the membranes formed. Examining the flux, permeability and selectivity of the membranes allowed studying the efficiency and performance of each membrane. The application results achieved in wastewater treatment at Chenoua/TIPAZA station were very satisfactory and in accordance with the standards required by WHO. The optimal performance, in terms of permeability and selectivity, was obtained for the MC membrane with the composition: PSF/PEG/AC of 25/12/63.
PERAN MEDIASI STRES KERJA PADA PENGARUH JOB INSECURITY DAN BEBAN KERJA TERHADAP TURNOVER INTENTION KARYAWAN ( Studi Kasus Pada Karyawan Outsourcing PT. DVN )
Authors: Setyowati Widhy , Setyawati Titi , Setyawati Titi
Published: July 2021

The purpose of this study was to analyze work stress on work stress. To analyze the effect of workload on work stress. Analyze the effect of job insecurity on turnover intention. Analyze the effect of workload on turnover intention. Analyze the effect of job satisfaction on turnover intention. Techniques regarding data using a questionnaire by applying a questionnaire to PT.DVN employees. The results are Job insecurity has a positive and significant effect on work stress, workload has a positive and significant effect on work stress, job insecurity has a positive and significant effect on turnover intention, workload has a significant effect on positive and positive work turnover on turnover intention, job insecurity has a significant effect on turnover intention. positive effect on turnover intention through work stress, and workload has a positive effect on turn over intention through work stress.
Effects of Ti doping on scintillation properties of CaZrO3 single crystals
Authors: Fukushima Hiroyuki , Nakauchi Daisuke , Kato Takumi , Kawaguchi Noriaki , Yanagida Takayuki
Published: July 2021

The Ti-doped CaZrO3 single crystals were successfully synthesized. All the samples exhibited a high transmittance up to 80% and an absorption edge derived from the doped Ti. Both the photoluminescence (PL) and scintillation spectra revealed a broad emission band. The PL and scintillation decay curves had two emission components, and these decay time constants were less than 1 μs. All the Ti-doped samples exhibited clear photoabsorption peaks, and the light yield of 1370 photons MeV−1 was obtained in the 1% Ti-doped sample.
Ce concentration dependence of optical and scintillation properties on Ce-doped La2Si2O7 crystal
Authors: Kantuptim Prom , Kato Takumi , Nakauchi Daisuke , Kawaguchi Noriaki , Yanagida Takayuki
Published: July 2021

A lanthanum pyrosilicate (La2Si2O7, LaPS) single crystal is successfully grown with a Ce-doped concentration of 0.5 to 20.0% as well as undoped LaPS for reference. The photoluminescence emission map of Ce-doped LaPS has broad emission at 360–410 nm from Ce3+ 5d-4f transition, with a decay time of 20–24 ns. In the scintillation properties, Ce-doped LaPS presents the scintillation peak at 390 nm under X-ray excitation, with the decay time constant at 26–31 ns plus another decay constant caused by the emission from host material at 250–600 ns. The afterglow level at 20 ms after X-ray irradiation is around 30–56 ppm. In the 662 keV γ-ray pulse height spectra, 1.0% Ce-doped LaPS shows a clear photoabsorption peak, with a scintillation light yield of 5400 ph MeV−1. The relationship between γ-ray energy and the photoabsorption peak channel (linearity) is also covered in this study.
THE ISSUE OF FORMING OPTIMAL ECONOMIC POLICY OF ENVIRONMENTAL PROTECTION
Authors: LOMIA TARIEL
Published: July 2021

In the state the environmental policy faces three main issues, they are: The issue of internalization of external costs (i.e. the issue of transaction costs), informing issues and the issues of control. The issue of transaction costs must be overcome by effective and active environmental policy. This can only be done if the ways of efforts of environmental policies are used to create (the use of instruments) situations on the market that are not voluntarily established. There is a precondition for this fact if the environmental policy conductors have enough information about relationship between natural resources, production, technology and environmental impacts. In other ways how can we identify and determine the quantity of harmful substances that are allocated by different pollutants (e.g. setting limits of environmental pollution). So far, there is a huge deficit of the possibilities of obtaining and reacting to the information
by the National Environmental Protection Service Officials all over the world. It is also unclear whether the state has the possibility to examine the legality of the
environmental law by the economic subjects (control problem), the discussion on the size of radioactive irradiation is still relevant. In case of violation of legislative
norms on environmental pollution by the economic subjects, the controlling system must have more effective sanctions (violators should pay higher cost of expenses
than expected benefits).