bluuebunny/crossref_metadata_2025_split huggingface dataset:
Parametrically Excited Nonlinear Two-Degree-of-Freedom Electromechanical Systems
Authors: Zaghari Bahareh , Kniffka Till , Levett Cameron , Rustighi Emiliano 
Published: July 2019

Abstract
This paper presents a nonlinear parametrically excited cantilever beam with electromagnets. A parametrically excited two-degree-of-freedom (2-DOF) system with linear time-varying stiffness, nonlinear cubic stiffness, nonlinear cubic parametric stiffness and nonlinear damping is considered. In previous studies the stability and bifurcation of the nonlinear parametrically excited 2-DOF were investigated through analytical, semi-analytical and numerical methods. Unlike previous studies, in this contribution the system’s response amplitude and phase at parametric resonance and parametric combination resonance are demonstrated experimentally and some novel results are discussed. Experimental and analytical amplitude-frequency plots are presented to show the stable solutions. Solutions for the system response are presented for specific values of parametric excitation frequency and the energy transfer between modes of vibrations is observed. The results presented in this paper prove that the bifurcation point and hence the bandwidth of the parametric resonance can be predicted correctly with the proposed analytical method. The proposed nonlinear parametrically excited 2-DOF can be used to design Micro ElectroMechanical Systems (MEMS) actuators and sensors. Validating the experimental results with the theory can improve the efficiency of these electrical systems.
Introduction of line contact in frequency-based substructuring process using measured rotational degrees of freedom
Authors: Čepon Gregor , Drozg Armin , Boltežar Miha 
Published: July 2019

Abstract
The theory of frequency-based substructuring enables us to combine the dynamical behavior of multiple subsystems into the common response of the whole system. Subsystem’s properties can be numerically or experimentally obtained in the form of frequency response functions. Response models are then coupled together taking into account a connectivity conditions. However, when one is dealing with a statically indeterminate multi-point connections such as flanges connected over several bolts, it is difficult to properly define a model in the numerical environment. In order to obtain real contact conditions a few methods like virtual point transformation and multi-point connection were proposed in recent years. Since an indirect approach of obtaining rotational motion struggle to accurately define local dynamic characteristics i.e. antiresonances, it also rely on assumption of rigid interface. In this paper we are introducing an alternative approach, where all six degrees of freedom are experimentally obtained with aim to directly address local joint flexibility in the substructuring process. This procedure represent an alternative to the method that removes the effects of a flexible fixture, however here it is done directly by measuring contact dynamic without the need of additional fixture block. Rotational responses are directly obtained using rotational accelerometer that enable us to gather all six degrees of freedom in each experimental point. Consequently, contact can be fully defined with less measurement points where several of them with only translational responses are required in other methods for reconstruction of rotational motion.
Vehicle-track-soil interaction and train-induced ground vibration – Theory and measurements in Germany, Switzerland and France
Authors: Auersch L 
Published: July 2019

Abstract
Three measurement campaigns of train-induced ground vibrations are evaluated for the vehicle-track-soil interaction. Ground vibrations, track vibrations and vehicle vibrations have been measured for train passages and impulse excitation and compared with theoretical results. The soil and the track-soil system are calculated by wavenumber integrals. The influence of the vehicle is introduced by a substructure method. By comparing theory and measurement the different components of excitation force and ground vibration can be analysed, the quasi-static excitation, track-alignment errors, the out-of-roundness of wheels, the wheel and rail roughness, and moreover, scattered axle impulses and ineffective high-frequency parts of the wheelset accelerations and forces.
Effect of contact area with fixture on dynamic behaviour of joint interface in ultrasonic welding of thermoplastics
Authors: Kuratani F , Miyano S , Yoshida T , Washio S 
Published: July 2019

Abstract
Ultrasonic welding is one of the most common methods for joining thermoplastics. The two plastic parts to be joined are placed on the fixture before high frequency mechanical vibration is applied to the parts through an ultrasonic horn. This generates heat at the joint area and locally melts thermoplastics. The parts are welded together. In this paper, we investigate the effect of the contact area between the lower part and the fixture on the dynamic behaviour of the joint interface, which affects heat generation. The displacements and elastic strains of the interface are predicted using finite element dynamic contact analysis and compared for different contact areas. The results show that the dynamic behaviour of the interface depends on the dynamic characteristics of the two parts. When both natural frequencies are close to the horn vibration frequency, the displacements and strains are small. Conversely, when the lower part has no natural frequency near the horn vibration frequency, the displacements and strains are large. The contact area significantly affects the dynamic behaviour of the interface. This is because its dynamic behaviour depends on the natural frequencies of the parts to be joined while the natural frequency of the lower part is easily improved by the contact area.
Research and development of acid corrosion inhibitor for single stage process of isoprene synthesis
Authors: Burganov R.T. , Shepelin V.A. , Gilmullina A.R. , Kovrizhnyh E.A. , Khasanova D.I. , Dikaryova U.M. 
Published: July 2019

Abstract
New acid corrosion inhibitor OPC-2000 has been developed for a single stage process of isoprene synthesis. Gravimetric method has found high effectiveness of the inhibitor in conditions of dilute ortho-phosphoric and sulfuric acids towards alloys Incoloy 825 and 12X18H10T being applied within the range of 10-16 g/dm3. According to electrochemical investigation, OPC- 2000 is an anodic class inhibitor. It has high dispersing properties (no sediment formation in reactors), the fact being confirmed in the course of PJSC Nizhnekamsneftekhim’s industrial trials while a single stage of isoprene synthesis.
Method of Aluminum Salts Extraction from Wastewater Using Desalination Technology: Syr Darya River Case Study1
Authors: Junussova Lyazzat Ryskhanovna , Chicherin Stanislav Viktorovich 
Published: July 2019

Abstract
The Aral Sea Region is characterized by being a very demanding consumer of industrial wastewater treatment. We studied the effects of various pretreatment methods on aluminum production. This method can be used as an alternative one in industrial wastewater treatment. The aim of multi-year study is to explore a nanofiltration as a one of the most attractive technologies for this application since nanofiltration membranes can retain ions and small organic molecules from an aqueous solution. But it is also very challenging due to the presence of salts and operating problems such as fouling, salt deposition, etc. Result becomes available thank to experimental set-up based on an ion exchange and a reverse osmosis. Results are also verified by evaluation tests and field applications showing their usage and wastewater conversion efficiency. The technological scheme includes combined water treatment plant using desalination technology and additional block functioning for an aluminum production and a temporary storage. Aluminum is to be produced of the Syr Darya river rich of it with the help of cutting-edge technology of oxide film removal and cartridge packing. This work evaluates the use of aluminum accumulated in the reaction unit by means of aluminum powder plus water module to reduce the pollutant contents of industrial wastewater quickly and effectively. The invention makes it possible to reduce the cost of aluminum by 3-4 times. Energy consumption of the desalination process was also discussed. Extracted aluminum is a superior material for industry. The high activity of aluminum to water is prohibited by a thin layer of aluminum oxide on its surface. The water treatment system with a combined phase purification and desalination may contribute up to 50 per cent to meeting the reduction of energy consumption for end product (aluminum).
Water purification from phenol on materials from subtropical crops’ wastes
Authors: Somin Vladimir , Komarova Larisa 
Published: July 2019

Abstract
The article considers the possibility of using materials on the bases of wastes of subtropical crops for water purification from phenol. The modification of banana peel, orange peel and pineapple peel by chemical and thermal methods was carried out. The static and dynamic capacity of obtained sorbents was determined; their ability to regeneration was estimated.
Year-round fish breeding on energy saving principles of industrial aquaculture
Authors: Garlov P.E. , Rybalova N.B. , Shinkarevich E.D. , Nechayeva T.A. , Temirova S.U. , Bugrimov B.S. 
Published: July 2019

Abstract
With a view to year-round valuable fish farming a control system terming their breeding and growth, protected by USSR inventor’s certificates and Russian inventor’s patents, was developed. The management principle is fish contents in “critical” salinity along with the simultaneous thresholds “signal” factors (temperature and light) and subsequently obtaining offspring and juveniles in complex of optimal ecological conditions.
For the implementation of the proposed industrial biotechnology and year-round fish farming a new installation of water recycling system (WRS) hatcheries and farms was developed by means of the underground conditioning of fish cultivation medium. Their essence is that fish farm water supply systems are additionally provided by underground, or in a half in ground large volume tank-sump tanks. Such WRC, being isolated from climate conditions, allow to conserve and use natural seasonal water resources and first consensually resolve earlier alternative volume-dependent energy problem (requiring lower volumes of water) and water purification (requiring its increasing) in septic tank-sump tanks. The basic principle of their operation is filling one tank-conditioner by “cold” water and the other by “warm” at the appropriate seasons and by additional water supply fish farm systems water circulation. Techno-economic calculation shows, that with the increasing volume of such water air conditioning heat transfer will be proportionally reduced, but productivity increases and reduces its system specific cost while maximizing reliability.
The development and energy efficiency of LNG in Russia
Authors: Ketoeva N.L. , Orlova Y.S. 
Published: July 2019

Abstract
The state data of the market structure and the development of liquefied natural gas (LNG). The major LNG projects being implemented or planned for implementation on the territory of Russia. Characterized prospects for the development of LNG production in Russia up to 2023. The main problem of LNG projects implementation. Marked instruments contributing to the development and the energy efficiency industry improvement.
Substantiation of the need for long-term planning of hydropower development as an element of energy management in Russia
Authors: Novikova O.V. , Kamenik L.L. , Furtatova A.S. , Denisova P.I. , Livshits S.A. 
Published: July 2019

Abstract
At the present stage of social development, the need to assess the prospects for the rational use of the hydropower resource potential in Russia had been manifested as an independent unresolved problem, which urgently requires the study of its essence, regularities, the specifics of manifestation and the mechanisms for its solution. This testifies to the urgency of the conducted research, whose purpose was to conduct analytical work on the evaluation of current priorities and directions in energy development and the study of new approaches to long-term planning in hydropower development. The solution of the task was accomplished on the basis of a systematic approach to forecasting the resource potential, energy, hydropower and economic development of the country, which is the novelty of the work. The conclusion is the increasing role of hydropower. The article is interest to scientists, government employees, professors, students and all those who are interested in sustainable development of the society.
Perfection of the methodology for developing industrial secondary energy generation systems
Authors: Plotnikova L V , Giniyatov R R , Sitnikov S Y , Fedorov M A , Zaripova R S 
Published: July 2019

Abstract
The algorithm for selecting an energy-efficient secondary energy generation system for large industrial enterprises is proposed. The updated coefficients of the system use of heat and exergy and the Sankey diagram are given. The software implementation of thermodynamic calculations of complex industrial schemes with secondary energy generation devices is presented.
Production of biogas from poultry waste using the biomass of plants from Amaranthaceae family
Authors: Karaeva J.V. , Kamalov R.F. , Kadiyrov A.I. 
Published: July 2019

Abstract
The experimental results of kinetics of biogas formation for the organic waste utilization are presented for the case where combinations of technological and microbiological methods are used to enhance the process (ultrasonic pre-treatment and coenzyme with a new plant supplement). The plants from Amaranthaceae family are used as plant supplements. The influence of Amaranthus hypochondriacus and Amaranthus retroflexus L. on the process of methanogenesis for poultry wastes is analyzed. Based on the experimental results it is obtained that the maximum daily yield of biogas from substrate including the Amaranthus retroflexus L. and Amaranthus hypochondriacus are 310 ml and 252 ml respectively. For example the maximum daily yield of biogas from substrate without any plant supplements was 211 ml (“pure substrate”). Thus the biogas output rate from poultry waste using the biomass of plants from Amaranthaceae family is 47% higher than standard case. The total biogas yield using the plants supplement from Amaranthaceae family is higher than standard case.
On low-frequency unsteady phenomena caused by cavitation in hydroturbines
Authors: Kuibin P A , Zakharov A V 
Published: July 2019

Abstract
When hydroturbines operate at part load or over load, intense pressure and vibration pulsations may occur. One of the instability mechanisms is due to the presence of a cavitation bubble (or cloud) behind the runner. Chen et al. [1] the phenomenon is modeled using the concept of cavitation compliance. They demonstrated the destabilizing effect of the diffuser and swirl. In the present work, the influence of two factors on the coefficients of the characteristic equation, whose solution yields natural frequencies and oscillation increments, is revealed. They are the vorticity distribution and the size of the cavitation cavity behind the runner. It is shown that the effect of swirl on stability is much smaller than that described in [1] and rapidly decreases with the growth of cavitation bubble size.
Experience and inspiration in shaping urban cultural space: Cases of London, Paris, New York and Tokyo
Authors: Wei Wei , Shuaiquan Zhang , Bing Wang 
Published: July 2019

Abstract
Urban culture place is the concentrated embodiment of urban vitality, which has increasingly become the focus of urban construction. It’s of great practical significance for improving city quality and realizing sustainable development to study the shaping methods of urban cultural space. In this paper, four international cities’ status quos of cultural space development are chosen for case studies. The spatial types are classified into three levels: “integration-functionality-serviceability”. The shaping methods include strategic guidance, shaping diverse cultural spaces, forming characteristic cultural industries, and promoting the equalization of cultural facilities. Based on the above, it is proposed that in the important period of urban transformation and development in China, we can learn from international experience in terms of creating urban image, formulating cultural development planning, developing creative industries, and improving urban cultural atmosphere and vitality, and achieving the goal of diverse cultural space, abundant cultural activities, accessible cultural facilities and prosperous cultural establishment.
Monitoring and Analysis of Ultra-wide and Deep Foundation Pit Deformation in Complex Environment
Authors: jia Liu 
Published: July 2019

Abstract
Taking the deep foundation pit of Foshan Zongde Service Center as the research background, the on-site monitoring data of the deep horizontal displacement, supporting axial force, horizontal displacement of the wall and the settlement of the column pile during the excavation process of the deep foundation pit are analyzed. The results show that during the excavation process of the deep foundation pit, the envelope structure is basically not affected by the excavation of the soil within the pit after the excavation surface is less than 10m; the reasonable arrangement of the support position can effectively reduce the displacement amplitude of the wall body; encryption monitors the change of the axial force of the adjacent support, and prestresses the upper support to improve the safety of the foundation pit; the greater the depth of the foundation pit is, the uplift of the column under the combined action of the pile side frictional resistance and the support of ballast and self-weight - sedimentation rate. The larger the amount of change is, the more the ballast is applied to the support when the support is poured, the amount of rebound of the column is reduced, and the continuous excavation of the earth can be effectively reduced to reduce the peak of the column uplift and prevent the column from being unstable due to the large difference between the settlement and the uplift. Endanger the safety of the support system in the pit.
Driving Factors of Green Supply Chain Management in Building Materials Enterprises
Authors: Zhu Jiaqi , Xu Jie 
Published: July 2019

Abstract
With the deterioration of the ecological environment and the improvement of consumers’ green consciousness, the government and society put forward higher requirements for the green supply chain management of building materials enterprises. Some enterprises have already begun to implement green supply chain management, which brings pressure to other enterprises. Through the investigation of 245 building materials enterprises, this article establishes a model of the influence of external stakeholders on green supply chain management through the environmental awareness of internal executive and uses factor analysis and regression analysis to verify the research hypotheses. Empirical analysis results show that government regulation, consumer pressure and supplier and distributor pressure have significant positive effects on green supply chain management, and there exists intermediary effect of executives’ environmental awareness between external stakeholders and enterprise green supply chain management. Thus, this article puts forward some suggestions on how to effectively improve the green supply chain management level of building materials enterprises from the perspective of executives, government and consumers.
Exploration of Standardized Greening Applied in Improving Air Environment in subway Cars
Authors: Linfeng Wu 
Published: July 2019

Abstract
The main contradiction in our society has been transformed into a contradiction between the people’s growing need for a better life and the lack of development imbalance. Nowadays, with the development of high quality and encouraging green travel, People’s pursuit of travel comfort and high quality of travel environment is getting higher and higher. This paper analyses the problems existing in the current high-speed development of subway transport industry and its air improvement mode, puts forward a new greening product scheme designed with standardization concept, and preliminarily analyses its application value. It has certain value to enhance the passenger experience, reduce the damage to the staff around the subway, promote high-quality life, and alleviate traffic congestion.
Effects of pepper tissue extracts on allelopathic effects of different vegetables and soil enzyme activities
Authors: Luxi Yang , Yongdong Xie , Wenyi Yan , Zhong-qun He 
Published: July 2019

Abstract
Cucumber, cabbage(Brassica oleracea L.), and cowpea as acceptor materials, the effects of four concentrations of (0.01 g/ml, 0.02g/ml, 0.03 g/ml and 0.04g/ml) root, stem and leaf aqueous extracts of pepper on the allelopathy of recipient vegetable and the enzyme activity in rhizosphere soil were studied. The results showed that the allelopathic effect of different tissue extracts of pepper was leaf > root > stem, and the greater the concentration of treatment solution, the stronger the inhibitory effect on the recipient vegetables. According to the value of the comprehensive membership function, the order of the allelopathic effect of different tissue extracts of capsicum on the recipient vegetables is cucumber > cabbage > cowpea. The concentration of the pepper extract, the extraction site, and the difference of the acceptor materials can affect the soil enzyme activity. The urease activity increases with the increase of the concentration, and the catalase and sucrase activities increase first and then decrease.
Implementing Alternate Polymer flooding to Improve Dry Powder Utilization
Authors: Yuan Yuan 
Published: July 2019

Abstract
After more than ten years of industrialized production, polymer flooding in Daqing Oilfield has formed a relatively mature matching development technology, and the tertiary oil recovery production mainly by polymer flooding has accounted for about one third of the total oil field. However, in recent years, the problem of increasing the amount of polymer dry powder and worsening the development effect and benefit has become increasingly prominent. In order to improve the development effect of tertiary oil recovery, reduce the cost of tertiary oil recovery and improve the utilization ratio of dry powder, the alternating polymer injection technology for second class reservoir is explored and implemented. By optimizing the parameters of alternating polymer injection, the optimum injection period, viscosity and strength are given quantitatively on the basis of laboratory research and numerical simulation. After application, good results have been achieved. This technology provides technical reserve and practical experience for efficient development of polymer flooding in second class reservoir.
Properties of Reactive Powder Concrete under Multi-factor Destruction
Authors: Xin’e Yan 
Published: July 2019

Abstract
This paper presents a comprehensive investigation regarding the carbonation, chloride ions penetration and freeze-thaw durability test of Reactive Powder Concretes (RPCs). Experimental results demonstrate that the depth of carbonization deepens in RPCs with the extension of carbonization time, but the internal carbonization reaction gradually weakens. The wetting-drying cycles accelerates chloride ion migration in concrete. Freeze-thaw cycles reduce the mechanical properties of concrete.