bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Software Runtime Credibility Based on Cluster Analysis
Authors: Wan Weiqing , Zeng Qingyan , Wen Zhicheng
Published: March 2020

Monitoring and analyzing the reliability of software runtime behavior in an open, dynamic, and complex network environment is very important for modern distributed software. The characteristics of the extrinsic representation in the execution of distributed software are collected, and the data is executed based on the history of the software, and the wide square cube cluster is constructed, and the reliability is analyzed, and the fault tolerance processing and the fault diagnosis of the succeeding system are analyzed. Performance optimization is facilitated. Simulation experiments show that the proposed method has a unique advantage in comparison with other methods in reliability analysis of software behavior.
Dynamic stability analysis and Experiment of the Mobile Elevating Work Platforms
Authors: Gao Xuhong , Sun Di , Ge Yan , Yang Xiantao , Li Jin
Published: March 2020

In order to calculate dynamic stability of the Mobile Elevating Work Platforms (MEWP) during driving across obstacles and operating on the slope, the analysis method based on mathematical models and simulation models of the MEWP was put forward, then the MEWP dynamic simulation models where the tires and booms were set as flexible bodies were made by ADAMS. Four kinds of the most dangerous working conditions were analyzed, and then the dynamic curves of tire loads and dynamic stability safety coefficient were obtained. Next, the dynamic stability of the MEWP during operating on the slope was verified by field experiments, and the results show that the minimum dynamic stability safety coefficient is 0.157. By comparison and analysis of dynamic stability safety coefficient between simulation analysis and field experiment, it can be seen that the deviations are all positive and less than 5%, therefore the results show that the dynamic stability of the MEWP during driving across obstacles are satisfied. At the same time, the analysis method combining dynamic simulation and some field experiments of the MEWP is proved reliability, accuracy and economy. In all, the dynamic stability of the MEWP can be calculated accurately by ADAMS, in the meantime, the overload operation test (1.5 times rated load) must be performed on the 5° cross slope before the MEWP are selled, and so long as the minimum dynamic stability safety coefficient is no less than 0.1, the MEWP are proved stability and safety.
Fluid-Structure Coupling Vibration of an Elastically Restrained Circular Plate
Authors: Yao Shihui , Fu Aihua , Xing Junhua , Zhou Jinhua , Tian Bo
Published: March 2020

In this paper, an analytical method is presented to calculate the fluid-structure coupling vibration of an elastically restrained circular plate. The displacement of the plate is expanded in series of dry mode shapes and the motion of the fluid is described by velocity potential function. Considering the equilibrium differential equation of the plate and the velocity continuous conditions at the interface of fluid and structure, the Galerkin method and expansion of Fourier-Bessel series are used to establish the governing equations of the system. The free vibration characteristics of the circular plate in contact with fluid are studied and the present method is verified by comparison with numerical results. Furthermore, the influence of spring stiffness and fluid depth on the free vibration characteristics of the circular plate is investigated.
Atomic layer deposition of Ti and its deposition method
Authors: Zhang Xingyu
Published: March 2020

Atomic layer deposition (ALD) is a very popular thin-film technique, and it is considered to be a method with great potential because it can produce conformal thin film with control of the thickness of layers and composition of the films at the nano-scaled level. In fact, there are other two types deposition techniques: Chemical Vapor Deposition (CVD) and Physical Vapor Deposition (PVD), which are also commonly used in surface treatment. However, the treatment conditions are different as CVD requires up to 1000°C while PVD requires lower than 500 °C. However, because of the self-controllability in ALD, this technique is widely applied in the fields including semiconductors, nanotechnology, and catalysts. In our current knowledge, substantial numbers of element could be used for ALD to form substrate layers. Some notable elements are carbide, Nitride, oxide, metal and so on. Among all kinds of possible deposited materials, titanium contained precursor are special and they receive tremendous attention because they could strengthen the base materials or protect the base materials from oxidization so that they improve the mechanical or chemical properties of pristine materials. Specifically, it could improve the properties of base materials such as reducing the work function, which is discussed in the passage. The purpose of this review is to provide an overview of current technology of deposition titanium contained chemicals and point out possible research topics in the future.
RETRACTED: Self-Healing Performance of Protective Coating with Inhibitor Loaded Nanoparticles of Mesoporous Silica on Copper Alloy
Authors: Zhang Liwen , Song Jiping
Published: March 2020

The self-healing coating on the copper alloy surface was prepared by adding inhibitor loaded composite nanoparticles into alkyd varnish coating with a content of 4 wt.%. The self-healing performance of the scratched coating immersed in 3.5% NaCl solution was evaluated by morphology observation, Fourier transform infrared spectroscopy, electrochemical impedance spectroscopy and scanning Kelvin probe. It has been proved that the scratched coating containing the composite nanoparticles can be self-healed with the formation of the inhibitive film at the coating crevice during the immersion.
Diagnostic method and application of low speed sliding bearing wear fault
Authors: Guo Junshan , Zheng Wei , Han Yue , Zhu Linkai , Che Yongqiang , Wang Jin , Wang Ming
Published: March 2020

The static thermal and dynamic characteristics of the oil film affect the motion stability of the rotor system and directly determine whether the entire equipment can operate safely and stably. In this paper, the characteristics of sliding bearing oil film are studied by theoretical analysis, and the bearing wear fault diagnosis model is proposed. The model is verified by the actual production. The results show that the proposed diagnostic model can quickly locate the cause of the fault and ensure the safe and stable operation of the equipment.
Research Progress on Typical Fault Monitoring and Diagnosis of Aircraft Engine
Authors: Li Jiayan
Published: March 2020

As one of the core components of aircraft, whether engine could be operated normally will directly effect on the safety of aircraft. How to monitor and identity different fault condition about core components of engine plays a vital role in ensuring air safety and reducing maintenance costs as well as has important value in safety and economy. This paper summarizes the typical fault and monitoring means of aircraft engine, which can provide some references for related research.
Study on Controllable growth of graphene prepared by CVD
Authors: Zhou Xin
Published: March 2020

Graphene is a two-dimensional honeycomb crystal of monoatomic thickness composed of hexagonal sp2 hybrid carbon atoms. Since the mechanical separation of Andre Gamm and Konstantin Novoselov in 2004 to obtain a single layer of graphene, this unique two-dimensional structure makes graphene excellent physical, chemical, mechanical, electrical and other properties. It has become the focus of much research in recent years. These properties include exceptionally high charge, high mechanical strength and elasticity, optical clarity and a variety of possible chemical modifications that make graphene promising in micro-nanoelectronics, photodetection and conversion materials, structural and functionally enhanced composites and storage. It can be applied in a wide range of fields, but graphene is different from graphite in nature, and its size is small and the yield is low. So how to prepare high quality graphene is the key to study its application prospects. The emergence of chemical vapor deposition (CVD) technology solves these problems and has evolved into an important method for preparing large-area, large-size, multi-purpose graphene. Large-sized graphite thin single crystals can be obtained on a substrate by controlling the growth mode and different treatments for the substrate. Due to the strong interaction between carbon atoms and the substrate, there are still many difficulties and challenges in directly growing graphite on the insulating substrate. This topic aims to prepare graphene by chemical vapor deposition (CVD) and prepare it. The method is improved to obtain graphene with excellent performance, which provides more feasibility for the practical application of graphite thinning in semiconductor devices.
Research on Evaluation Method of Storage Reliability of a Control Cabin
Authors: Zhao Xiaodong , Mu Xihui
Published: March 2020

A problem that is difficult to assess for storage cabin storage reliability. According to the historical data of the control cabin, the life distribution function was assumed, and the model parameters were estimated by the maximum likelihood estimation method and the minimum chi-square estimation method respectively, and different storage life distribution functions were obtained. Then compare and analyze different storage life distribution functions to determine the storage life distribution function of the control cabin. Finally, the Person’s chi-square goodness-of-fit test was used to verify the results. The life distribution function of the control cabin is the I-type maximum value distribution, and the storage life is 18.12 years when the confidence is 0.90 and the reliability is 0.95. It provides a basis for subsequent life extension maintenance work and compares different storage reliability assessment methods.
Reactivity of Metal Boronhydride Derivatives with Amines and Ethanolamines
Authors: Chen Ling , Yang Liya , Wang Chunxia , Zhu Ting
Published: March 2020

Reducing agents LiBH4, NaBH4, NaBH(CO2CH3)3, NaBH(OCH3)3 and NaBH3CN are widely applied in organic synthesis, biochemistry and medical chemistry. In this paper, the structure and the reactivity of metal boronhydride derivatives with amines were studied and the coordination of amines and ethanolamines towards metalboronhydride derivatives was investigated.
Synthesis and Electrochemical Performance of Zn-Doped LiMn2O4as Cathode Material for Lithium Ion Batteries
Authors: Zheng Hao , Wang Ting , Cheng Jinsong , Li Lin , Liu Qing , Zhao Rongfei
Published: March 2020

The spinel LiMn2O4and Zn-doped LiMn2O4samples were prepared by a solgol method followed by annealing. The structure and morphology of the as-prepared material were analyzed by X-ray diffraction and electron microscopy. The results obtained show that those samples possess a perfect spinel structure. The electrochemical measurements are carried out to study the properties of the LiMn2O4and Zn-doped LiMn2O4. The results indicate that Zn-doped LiMn2O4manifests enhanced high capability, rate capability, and superior cycling stability. Especially, the LiMn1.9Zn0.1O4sample show good electrochemical performance (the reversible discharge capacity of 120 mAh/g at 1C, after 100 cycle).
Topology Optimization Design of Boat Boom Structure Based on Level Set Method
Authors: Qu Dongyue , Chen Qiang , Xu Jianan , Kou Tianxin
Published: March 2020

The marine boom is optimized by a level set topology optimization method based on the reaction diffusion equation. In order to overcome the characteristics that the boom is difficult to be topology optimized, the periodic topology optimization theory is introduced to divide the boom into several cycles, and two typical conditions of maximum amplitude and minimum amplitude are selected respectively. Finally, the optimized boom structure is processed and remodelled and finite element analysis is performed, which still meets the original performance index.
Dynamic Monitoring of RS and GIS Resources and Ecological Environment Based on High Temperature Materials
Authors: Jiang Shuhui , Tang Li , Ju Hui
Published: March 2020

The dynamic monitoring and analysis of regional ecological environment is an important part of land use research, which can provide support for regional ecological environment and macro regulation of government departments. With the support of remote sensing technology (RS) and geographic information system (GIS), a land use dynamic monitoring system is established to obtain land use change information quickly, accurately and economically. In order to reduce the influence of thermal radiation, noise and vibration of high temperature material machinery on the measurement results in high temperature measurement environment, the paper proposed the measurement method of ultraviolet light high humidity thermal deformation and gray average method. In this paper, the algorithm of digital image correlation method and the establishment of high temperature measurement system are studied. A set of high temperature material mechanical digital image correlation system suitable for high humidity environment measurement is independently established and applied to the high humidity test of materials. The results show that the above comprehensive method can effectively improve the influence of thermal flow disturbance on system imaging in high humidity environment. Comprehensive analysis of regional ecological environment data shows that environmental quality is closely related to regional ecological environment. Meteorological conditions are one of the important factors affecting the environment, and the project of returning farmland to forest plays a vital role in improving the environment.
Surface wettability aging behavior of aramid fiber III after oxygen plasma treatment
Authors: Guo Lu , Wang Jing , Jia Song , Yang Mingfei , Sun Fuding , Wang Junyang
Published: March 2020

Aramid Fiber III was modified by oxygen plasma treatment. The fiber surface wettability before and after different oxygen plasma treatment pressure, and surface wettability aging behavior were observed by Dynamic Contact Angles Analysis (DCAA), respectively. The results showed that aramid fiber surface wettability were increased after oxygen plasma treatment. The total surface free energy increased from 37.78 mJ/m2 for untreated sample to 69.63 mJ/m2 with 40 Pa plasma treated fiber. The fiber surface wettability decreased slowly with storage time in air. The fiber surface wettability decreased from 67.79 mJ/m2 for 20 Pa plasma-treated sample to 63.85 mJ/m2 after 30 days.
SnO2 microrods based triethylamine gas sensor
Authors: Wang Lu , Peng Ruiqin , Ci Lijie , Li Yuguo
Published: March 2020

Triethylamine (TEA) gas sensor having high response and stability are in great demand in the actual working environment. In this paper, SnO2 microrods are prepared on SiO2 (300 nm)/Si substrate by thermal evaporation. The SnO2 microrods-based gas sensor is successfully prepared. The gas response and stability of the sensor are tested at an optimal temperature of 200 °C. When the sensor is exposed to 100 ppm TEA gas, the response time is only 4 s. The detection limit is below 1 ppm. The gas-sensing mechanism is further discussed.
Robustness interval of apparent air bubbles of fair-faced concrete
Authors: Zhang Jian , Qian Chunxiang , Chen Yanqiang
Published: March 2020

In this paper, a method of controlling the apparent quality of fair-faced concrete is adopted. By adjusting the rheological parameters of fair-faced concrete slurry, the robustness interval of repeatedly stable preparation of fair-faced concrete with excellent apparent quality is obtained. It has a good economy and has a good guiding significance for practical engineering. The results show that the plastic viscosity coefficient of fair-faced concrete slurry is 5.67∼9.69 Pa·s, and the yield stress is between 112.25∼195.68 Pa. The fair-faced concrete with good apparent quality can be obtained.
Analysis and Optimization Design of Cantilever Structure of Shear Wall Corner
Authors: Hu Di , Peng Xuezhong , Shi Tinfeng
Published: March 2020

In the frame-shear wall high-rise building, it is necessary to design a special cantilever structure to connect shear wall with two mutually perpendicular frame beams when they do not intersect. In the paper an innovative simplified approach to design special cantilever structure with steel reinforced concrete is presented, which includes two steps as design of feasible steel structure and design of reinforced concrete based on structural analysis and optimization. The demonstrated design idea and design method provide valuable reference for innovative design of complex cantilever structure of shear wall corner with frame beams.
The Measurement to the Pillar Fillet Weld of the Differential Settlement Spherical Tank by the ACFM
Authors: Wu Zemin , Dai Guang , Zhou Guoqiang , Leng Jiancheng
Published: March 2020

Present the method that using the ACFM to test the spherical tank which had appeared the differential settlement. First introduced the principle and the system composition of the ACFM, by using which, the pillar fillet weld of the LPG spherical tank had been tested, and then the quantitative evaluation of the weld cracks had been get out. After analyzed deeply, the reliability of the ACFM when testing the pillar fillet weld of the spherical tank had been proved, in additionally, the causes of how the cracks come out had been given, too.
Effect of Deformation on Precipitation Behaviors of Carbide in Ti-Nb-Mo Steel
Authors: Yang Yong , An Kang , Zhang Xiaofeng , Huang Zhenyi , Li Yanmei
Published: March 2020

The precipitation behaviors of (Ti, Nb, Mo)C in specimens of Ti-Nb-Mo steel hold at 700°C under no deformation condition and deformation condition with engineering strain 0.4 imposed in austenite region have been studied. The results indicate: under no deformation condition, the rows of interphase precipitation show straight and/or curve morphology, and the precipitation behaviors include interphase precipitation, random precipitation and fibrous precipitation; under deformation condition, the rows of interphase precipitation are straight, and the precipitation behaviors include interphase precipitation and strain-induced precipitation. Furthermore, the dispersion of precipitate particles formed under deformation condition is more uniform than those formed under no deformation condition.
Evaluation Research on Green Degree of Green Packaging Materials
Authors: Li Yan , Sun Zhenqing
Published: March 2020

Green packaging materials are packaging materials which are harmless to human health, have a good protective effect on ecological environment and can be recycled in packaging materials that people produce, manufacture, use and recycle. Green packaging materials can save resources and energy; they can be naturally degraded or reused without breaking ecological balance after being discarded, moreover, green packaging materials have a wide range of sources, low energy consumption, easy recovery and high recycling efficiency. Green packaging materials are the premise and foundation of green packaging design. Based on the analysis of the shortcomings of traditional material selection methods, this paper establishes the selection principles of materials in green packaging design, and elaborates on how to use theoretical method of pan-environmental function to evaluate the green degree of green packaging materials, and finally select the best green packaging materials.
The explosion resistance analysis of the safety evacuation device
Authors: Wang Yong , Feng Xuezhi , Cui Lizhuang , Sun Gengyu , Wang Yongyan , Jing Xiumin
Published: March 2020

The explosion resistance is one of the main functions of the safe evacuation device, and the explosion resistance of the safety evacuation device is mainly determined by the safe evacuation cabin, and therefore it requires the building structure to have sufficient strength and stiffness to resist the blast wave application to the cabin. In this paper, a new model of the similar triangular cabin structure is established. The explosion resistance impact analysis of the similar triangular cabin structure is carried out by AUTODYNA and ABAQUS software. The similar triangular cabin structure is placed in the simulated residential building, and the pressure cloud in the room during the explosion and the change of the pressure at each time in the single room can be obtained by TNT explosion test simulation. The pressure curve is used to analyze explosion resistance of the safe evacuation device, and the stress and deformation of the new cabin structure can be obtained. At the same time, the stress concentration are located at the corners of the interior of the cabin and the maximum deformation is located on the front and back walls of the pod which can meets the safety evacuation shock resistance.
Design of an ultra-thin magnetic radar absorber embedded with double period frequency selective surface for entire L-band microwave absorption
Authors: Xiao Houdi , Zhang Lingdong , Lv Mingyun , Qu Zhipeng , Wang Chuanzhi , Qin Ruiru
Published: March 2020

In this paper, a thin, broadband and low frequency with high absorption (more than 90% absorption) radar absorber (RA) consisting of magnetic-type material substrate and double period frequency selective surface (FSS) is demonstrated. The geometric parameters were investigated for its contribution towards absorption by the finite-difference time domain (FDTD) method. The effects of incidence angles of electromagnetic radiation were also discussed. The simulation indicates that the use of the double period FSS makes a remarkable increase of operational bandwidth and moves the resonant frequency to the lower frequency comparison with single magnetic radar absorption materials (SMRA). Due to the excellent symmetric nature of the proposed structure, the reflectivity is insensitive to incident angle from 0° to 30°. The reflectance of RA lower than -10 dB (over 90% absorption) is obtained in the whole frequency range of L-band which is 1.5 times wider than the bandwidth of the same thickness SMRA when the structure thickness is only 2.62 mm. The simulation method is verified by comparison with the experiment in the literature. Thus, the presented RA breaks the limitation of the thickness (λ/4) for the traditional low-frequency band absorbing material and has wide application prospect in electromagnetic shielding and low-frequency stealth.
Preparation of Ferrite Fe3O4 and Its Electromagnetic Wave Absorption Properties
Authors: Yang Fuli , Hou Xingzhe , Wang Lirui , Li Youjiang , Yu Miao
Published: March 2020

Ferrite materials have good frequency characteristics. Their relative permeability is large and relative permittivity is small. These make it suitable for matching layer and have a good application prospect in broadening the absorption bandwidth. In this paper, ferrite was prepared by a simple chemical precipitation-dehydration method, and the ferrite Fe3O4 particles with 40% mass fraction were mixed with paraffin to form a ring test sample. The experimental results show that the as-prepared sample at higher temperatures has more stable nucleation and fewer defects, so it has more significant electromagnetic wave absorption performance. The minimum reflection loss is about - 44 dB, and the electromagnetic absorption band with the reflection loss RL less than - 10 dB is located at 12.5-14.1 GHz (3 mm) and 6.5-8.1 GHz (5 mm), respectively.
Study on Electrochemistry of Composite Electrode of Nano Reticular MoS2/RuO2
Authors: Lu Yun , Ke Jiancheng , Wang Wei , Wang Ruonan , Wang Li
Published: March 2020

Nano Reticular MoS2 is prepared in the hydrothermal method. By means of hydrothermal method, the cathode material of composite electrode of MoS2/RuO2 is prepared. For all kinds of prepared samples, physical characterization analysis, such as SEM and XRD, and electrochemistry tests, such as cyclic voltammetry, alternating-current impedance and galvanostatic charge-discharge, are conducted. The test results show that the addition of a small amount of molybdenum disulfide improves the specific capacity of composite electrode, lowers alternating equivalent impedance and improves conservation ratio of specific capacity. When the doping content of molybdenum disulfide is 25%, specific capacity of binary composite electrode can reach 413 F/g and equivalent alternating-current impedance is equal to 0.665Ω. By means of 800 charge-discharge cycles, specific capacity still remains around 87%.
Study on Strain Test Law of the Semi-rigid base Asphalt Pavement
Authors: Liu Feng , Wu Chuanhai , Li Shanqiang , Xu Xinquan
Published: March 2020

In order to grasp the similarities and differences in the experimental strain law of different types of semi-rigid base asphalt pavement, based on the Yunluo highway durability test pavement, the strain monitoring system, temperature monitoring system and humidity monitoring system of the full-scale pavement were constructed, and corresponding test plans were formulated. Through the test scheme, the strain response laws of different structural layers of two asphalt pavements were obtained. Through the comparative analysis with the relevant theoretical analysis results, the rationality and credibility of the strain layout scheme and test scheme of the Yunluo durability test pavement were confirmed. Through the analysis of the measured strain data, it was verified that the graded crushed rock layer did have a decentralized effect on the load. At the same time, it was also confirmed that when the same pavement material was in different structural layers, its mechanical response under load was different.
Modeling of “Concentric Drum” Tilt Angle Model Based on Mechanical Analysis
Authors: Yang Zihao , Zhang Shiwei , Cheng Shanshan
Published: March 2020

“Concentric drums” is a group cooperation project, which requires better tacit understanding between the team members. At the same time, the force exerted on the rope can be accurately controlled, which contains a more complex mechanical relationship. In reality, it is impossible for the players to make force synchronously and the force is difficult to control accurately, which can be attributed to the following two situations: first, there is no situation in which the team has no force in advance but the size is not uniform when the force is applied, so the drum surface is at the level position at the moment when the players start to make force; second, there are individual players who make force in advance, and the strength of each player is different, resulting in the tilted of the drum surface when the players are exerting force. In the first case, the vertical component forces of two opposite members in the same straight line are combined into one force, then the moment of each resultant force is calculated and the vector sum is performed, the angular acceleration is solved according to the rigid body mechanics formula, and finally the tilt angle is calculated by using the time brought in by double integration. In the second case, firstly, consider that some members of the team will start the force ahead of time, and those members who do not start the force will be brought into the model of case I according to the force value of 0 to obtain tilt angle 1, Secondly, the force of the remaining team members is considered. At this time, based on the inclined plane, the force of each member after treatment is brought into the model of case I again to get the inclined angle tilt angle 2 caused by different forces. After two inclinations, three planes with different angles can be obtained. The angle between the final plane and the original plane can be calculated by using the space coordinate normal vector, that is, the bevel angle of horizontal inclination of the drum surface.
Mathematical model of increase in durability of road machines taking into account operating conditions
Authors: Zorin Vladimir , Tuan Le Tchong
Published: March 2020

In this article results of researches and development of a mathematical model of extension of a resource and increase in durability of the road machines functioning in tropical conditions of Vietnam taking into account operating conditions are considered. By means of the software of Matlab the original rated program of determination of optimum parameters of frequency of maintenance and repair is developed; the number of repairs and categories of maintenance which need to be carried out throughout all life cycle of the road machine for ensuring best values of indicators of durability of machines taking into account operating conditions.
The definition of force parameters when grinding materials with anisotropic texture pressure in the press roller unit
Authors: Romanovich A A , Amini E , Trishin P V , Chekhovskoy E I , Serebrennikov A S
Published: March 2020

The article deals with the issues of improving the efficiency of grinding materials with an anisotropic texture. The main specific features and conditions of the organization of the grinding process, including the conditions of loading materials with an anisotropic texture, the creating conditions of their directed motion and application of force load. The article explains the design of the press-roll unit (PRU) with a device for the directed supply of anisotropic materials is given, description its scheme and the process of work. The conditions of destruction of an anisotropic material between eccentrically mounted rolls are considered and an equation for the calculation of the specific force required for the destruction of anisotropic materials in eccentric rolls of PRU is obtained. The comparative data of values of specific values of crushing pressure at grinding of organogenic limestone obtained experimentally in PRU and by calculation are presented.
Risk factors affecting the implementation of construction projects in Iraq
Authors: Kim B G , Shakir Z N , Nasrulloeva R A
Published: March 2020

The construction industry of Iraq is widely associated with multiple influencing factors that due to their specific lead to increased uncertainty and multiple risks during the construction phase. The main objective of this article is to identify and evaluate key risk factors and their impact on the formation of car parks and the realisation construction projects in Baghdad (Iraq). In this study the risks associated with construction projects identified with the help of open questionnaire and interview with construction project specialists. In total, factors of risks were identified and categorized into five groups: financial, political, organizational, technical and legal. The study revealed that the top ten important risk factor are: inconsistency structure specifications(76.89%), changes in design(75.97%), late arrival of equipment and materials from the country of origin(75.74%), poor coordination between the client and the contractor(72.29%), lack of clarity in contractual obligations(71.17%), the occurrence of internal problems between the project parties(71.17%), dues payment delay not according to contract (68.09%), insufficient financial allocations to complete the project(66.37%), war (47.75%) and receipt of operational advances delay due to legal proceedings(46.58%).
A Study of the Characteristics of Electric Fuel Pumps of Automobile Engines
Authors: Gritsenko A , Shepelev V , Shubenkova K , Zemdikhanov M M , Gatiyatullin M H
Published: March 2020

The article considers theoretical and experimental research of the fuel system of motor-and-tractor engines: the change in the current consumption of an electric fuel pump (EFP) from the degree of contamination ε of series elements in the system and leakage in the injection unit of the EFP. The environmental friendliness and efficiency during operation of mobile energy resources is put first. According to some studies, currently, there are 43.5 millions of passenger cars in Russia, 29.2% of which do not comply with EURO-2 toxicity standards. Among light commercial vehicles, 42.9% do not comply with EURO-2 toxicity standards. Among trucks, 62.9% of vehicles neither comply with EURO-2 toxicity standards. The electric fuel pump combines electronic and hydraulic elements. According to the statistics of failures, most of them (up to 35%) fall at the electric motor. The main factors affecting failures of EFPs are: increased dustiness and humidity, water ingress into fuel, violation of maintenance intervals, etc.
Features of formation of gas-thermal coatings with equal thickness on flat surfaces
Authors: Belenkiy U I , Kretinin V I , Sokolova V A , Teppoev A V , Markov V A , Parfenopulo G K
Published: March 2020

The article deals with the formation of uniform gas thermal coatings on flat surfaces. It is substantiated that gas-thermal coatings are formed due to the superposition of single wavy stripes. The technique of obtaining uniform thermal coatings depends on spraying modes. The dependences of the speed of movement and supply of a gas-flame burner on the spraying distance are theoretically substantiated and experimentally confirmed. The dependence of coating thickness on the speed of a spraying device was determined.
The relationship of microrelief indicators of the friction surfaces of mobile interfaces of construction equipment
Authors: Gustov Y I , Sletov S Y , Shishkov P E
Published: March 2020

The paper presents the relationships of microrelief indicators of the friction surfaces of mobile interfaces of a hydraulic excavator equipment and passenger elevator. The authors use partial micro-wear and micrometall as initial indicators of microrelief. These indicators are used to determine important operational tribomechanical characteristics. The article proposes an approximating function of the curve of the reference lines for the entire domain of relative approaches.
Determination of rational cutting parameters while drilling intermediate by ring
Authors: Baranchik V P , Zakirov M F
Published: March 2020

The article analyzes the problem of reducing the cost of changing bits during deep drilling of directional wells due to the rational choice of operational parameters in the process of sinking rocks that alternate in strength. The authors propose a technology to control drilling parameters on the basis of preliminary information on the limits of rock strength over sections of the well, which allows to increase the bit flight and reduce the energy intensity of the drilling process.
Road safety strategies in the Russian Federation for 2018–2024 in Omsk Region
Authors: Simul M G , Porkhacheva S M
Published: March 2020

The paper explores the causes of accidents and ways to reduce their number through the use of targeted programs to improve traffic safety. The authors justify the choice of target indicators used in the development of such programs. The article gives an example of the development of a set of measures for one of the sections of Omsk city.
Modification of cement-bound mixtures with sodium formate additives for the construction of pavement bases at low air temperatures
Authors: Vdovin E A , Stroganov V F
Published: March 2020

The paper considers the influence of an antifrosty additive of sodium formate (SF) on the kinetics of hardening of cement-bound mixes (CBM) in the bases of road pavements at air temperatures from 00C to (-15) 0C with a cement content of 7.0% and 10.0%. The authors establish that the highest intensity of CBM hardening was noted in the first 7 days of hardening, at which the strength was 50-60% of the strength of the material at the age of 28 days. The SF modifier provides an increase in compressive strength (Rcs) of the material depending on the amount of additive and air temperature. The study makes it possible to establish the optimal consumption of SF for different temperature regimes of hardening of mixtures and at the indicated cement contents. The use of SF provides a 30% set of strength at a temperature not lower than (-5) °C. Modification of CBM with additives of SF provides the opportunity to increase the volume of construction of pavement foundations by performing work during periods of the year with lower air temperatures.
Development of transport infrastructure of urban mobility based on cable metro technology
Authors: Panfilov A V , Korotkiy A A , Panfilova E A , Lagerev I A
Published: March 2020

The article presents materials on the use of cable metro technology in a highly urbanized environment, as an improvement in urban mobility in the format of a smart city. The presented transport system is significantly different from the traditional cablecar, which is described in the comparative characteristics of each system. The article describes the principle of operation of the cable metro, based on the use of mechatronic motion modules.
Improving the quality of the investigation of a road traffic accident
Authors: Tikhomirov S I , Komarov Y Y , Volchkov V M
Published: March 2020

The article deals with the issue of improving the quality of auto expertise and as a result, with the issue of investigating road accidents. The main parameter used in the auto expertise is vehicle deceleration. But today we consider the characteristics of the roadway and the load of the car when decelerating a car. As for temperature factor it is not only ignored, but the possibility to take it into account doesn’t even exist. The impact of the ambient temperature on vehicle deceleration was studied. There was simulation of vehicle braking which physically justified the impact of ambient temperature. On the basis of the practical tests conducted, the dependence of vehicle deceleration on the ambient temperature was determined. This dependence will allow auto experts make calculations more objectively which will positively affect not only the course of road accident investigation but also the identification of factors conducive to development and emergence of the accident.
Comparison of various calculation models for the bridge dynamic analysis
Authors: Lang A V , Diachenko L K , Labutin N A
Published: March 2020

The purpose of this study is to determine the rational use areas of various computational models types while dynamic analysis. This topic is relevant because of the need to carry out precise dynamic calculations for structures at the high-speed rail, in order to ensure the design of a reliable structures. The object of the study is a single-span girder for the high-speed rail. Research methods are numerical analysis using various models; modal calculation of the oscillation shapes and frequencies; comparative analysis. The result of this study are recommendations on the areas of rational use of various types of models.
Literary Prize Culture
Authors: Marsden Stevie
Published: March 2020

As signifiers of literary value and taste, influencers of the literary canon, and indicators of distinction, literary prizes have played, and continue to play, an extremely important role in the promotion and celebration of literature. Far from being novel embellishments to an author’s career or book’s reputation, literary prizes have in fact become central components to the production, promotion, and longevity of literature in popular culture. They can increase book sales and print runs, heighten exposure and publicity, and consecrate an author’s place within literary canons. They are their own industry in and of themselves, their success dependent on many factors and agents including authors, publishers, booksellers, prize administrators, judges, and journalists. Literary prize scholarship is an ever-expanding, interdisciplinary field. Scholars have examined literary prizes in relation to cultural economics, sociology, linguistics, gender studies, postcolonial theory, book history, and publishing studies. However, when considering the impact of literary prize culture, it is important to remember that they are structured upon imperfect processes of judgment and selection. Yet, despite their limitations, literary prizes endure as one of the most captivating, dynamic and unique phenomena in literary and publishing culture. It is important for scholars to continue to interrogate literary prizes as a cultural phenomenon, in order to acquire a full understanding of the true impact they have on literary and publishing culture.
Transnational
Authors: Jay Paul
Published: March 2020

Both the shape and substance of literary studies have been dramatically transformed since the late 20th century by a growing interest in the transnational nature of literary production and circulation, and by explorations of how literature engages with forms of experience that transcend nation-state boundaries. During this period, the nation-state model for organizing literary studies has been augmented by a number of others, including comparative, multicultural, postcolonial, world, and global, that have dramatically transformed the geographical and cultural organization of the field. This shift has been accompanied by a wide range of theoretical work on the concept of the transnational. In addition, critical analyses of literary texts across a range of historical periods have paid increasing attention to the treatment of transnational and cross-cultural experiences in literature, so that the importance of the transnational as an organizing principle for scholarship and teaching has been matched by its emergence as a key subject of inquiry—and vigorous debate—in literary studies.
Sara Ahmed’s Critical Phenomenology of Communication
Authors: Stonecipher Rachel
Published: March 2020

Sara Ahmed is a feminist philosopher specializing in how the cultural politics of language use and discourse mediate social and embodied encounters with difference. She has published field-shaping contributions to queer and feminist theory, critical race and postcolonial theory, affect and emotion studies, and phenomenology. Since the publication of Differences that Matter: Feminist Theory and Postmodernism in 1998, her work has epitomized the value of contemporary feminist cultural studies to speak to and against the masculinist traditions of continental philosophy. Unequivocally inserting feminist politics into the rarified air of academic theory, it crosses the sexist boundary which corrals feminist thought into the category of “studies” while opposing it to male-authored philosophy—the latter automatically authorized to speak on the social and material “Real.” In doing so, her work sits squarely within discourse-analytical traditions that seek to expose how various epistemic scenes – activism, the media, and academia, to name a few -- sediment false authority on such issues as happiness, utility, and the good. Moreover, in contesting New Materialism’s search for some monist “matter” beneath experience, she traces how those linguistic moves impose insidiously singular concepts of what social “reality” is, and how it unfolds, for real people. As a field, communication studies concerns itself centrally with matters of social influence, scale, and power, such as the electoral effects of political speech, or the ability of a message to morph as it reaches new audiences. Turning a critical eye upon the (re)production of cultural norms and social structure through interpersonal and institutional encounters, Ahmed’s oeuvre explores the discursive logics and speech acts that sediment or transform the social meanings of race, gender, and other differences.
Self-Observation in Psychology
Authors: Brown Donald V. , Pryiomka Karyna , Clegg Joshua W.
Published: March 2020

Self-observation, an umbrella term for a number of methods associated with first-order accounts of mental activity (e.g. introspection) and first-person reporting, has been a part of psychology’s investigative procedures since the inception of the discipline. It remains an integral, albeit contested, tool for psychologists to use across essentially every sub-field. In areas such as phenomenology, memory research, psychological assessment, and ethnography, among others, self-observation has been deployed to access information not readily acquired through alternative methods. Other names for introspective methods include self-report, retrospection, inner perception, and self-reflection.
Hope Interventions for the Promotion of Well-Being Throughout the Life Cycle
Authors: Leontopoulou Sophie
Published: March 2020

Hope lies at the core of human psyche. It has a unique power to propel individuals, groups, organizations, and communities to action and can sustain their energies to help them achieve their goals. Hope is differentially conceptualized and studied as an emotion; as a positive motivational state incorporating elements of pathways and agency thinking and also as goals pursuit cognitions that can cause emotions; and, lately, as a character strength. Thus, hope research and practice transverses major theoretical and applied fields of psychology (namely positive) developmental, educational, and counseling psychology. Long-established links between hope and well-being places it in a unique position to affect positive youth development through positive education practices but also to enhance physical and mental health and positive psychosocial adaptation throughout the life cycle with the use of successful approaches in therapy and counseling. Established criteria for hope-based interventions and programs were developed all over the world with the express dual aim to enhance well-being and reduce psychopathology in different populations, ranging from children, adolescents, youths, and adults with and without physical and mental health problems and learning disabilities; and also across various settings, as diverse as educational institutions, therapy and counseling, recreational centers, and correctional facilities. Overall, hope-based interventions were successful in enhancing positive psychosocial outcomes and reducing depression and other problems. Underlying mechanisms that drive hope programs include the development of upward spirals of positive emotions that help people build enduring psychosocial resources; the process of goal setting and pursuit in itself; and the identification of optimal combinations of individual characteristics and intervention goals and techniques. A wide range of individual factors, such as participants’ and implementers’ characteristics and levels of motivation, in addition to contextual factors such as protocols, research designs, techniques, materials, analyses, and reporting choices impact the effectiveness of hope interventions. Future research can benefit from targeted hope interventions, matching specific needs, skills, and capacities of people and groups in different settings, including educational, therapy, organizational, and community ones, which can greatly improve academic performance, physical and mental health, productivity, and life quality.