bluuebunny/crossref_metadata_2025 huggingface dataset:
Model-based integration of genomics and metabolomics reveals SNP functionality in
Mycobacterium tuberculosis
Authors: Øyås Ove , Borrell Sonia , Trauner Andrej , Zimmermann Michael , Feldmann Julia , Liphardt Thomas , Gagneux Sebastien , Stelling Jörg , Sauer Uwe , Zampieri Mattia
Published: March 2020

Significance

Because genetic diversity in the
Mycobacterium tuberculosis
complex (MTBC) is less pronounced than in other pathogens, the variable outcome of infection has been attributed mainly to host and environmental factors. Here, we reveal widely different metabolic phenotypes among MTBC members, suggesting that strain diversity may play an important role during infection. To unravel the genetic basis for metabolic diversity, we developed a approach that integrates metabolomic and genomic data for 18 MTBC clinical strains. Our approach allowed us to investigate the metabolic effect of rare genetic variants and to predict mutations that associate with strain-specific metabolic vulnerabilities and inherent baseline susceptibility to antibiotics. Our model-based approach is broadly applicable to many organisms, opening possibilities for identifying more selective treatment strategies.
Securing timelines in the ancient Mediterranean using multiproxy annual tree-ring data
Authors: Pearson Charlotte , Salzer Matthew , Wacker Lukas , Brewer Peter , Sookdeo Adam , Kuniholm Peter
Published: March 2020

Significance

This study demonstrates how different lines of evidence from tree rings in widely spread growth locations can combine to fix an approximately dated tree-ring record from the East Mediterranean Bronze–Iron Age to an exact calendar-dated range. This tree-ring record is of high importance for regional chronology and spans the time period in which the major volcanic eruption of Thera (Santorini) occurred. Exact dating of this eruption is important because it provides a prominent marker horizon through which ancient timelines of the East Mediterranean, Egypt, and the Levant can be synchronized. Chemical analysis of the dated tree-ring sequence identifies a chemical change in their growth environment around 1560 BC, which while requiring further substantiation, may be evidence of the Thera eruption.
Nonclassical nuclear localization signals mediate nuclear import of CIRBP
Authors: Bourgeois Benjamin , Hutten Saskia , Gottschalk Benjamin , Hofweber Mario , Richter Gesa , Sternat Julia , Abou-Ajram Claudia , Göbl Christoph , Leitinger Gerd , Graier Wolfgang F. , Dormann Dorothee , Madl Tobias
Published: March 2020

Significance

We uncovered a molecular mechanism by which multiple importins regulate nuclear import, phase separation, and stress granule recruitment of an RNA-binding protein. Our work permitted the identification of two types of nuclear localization signal (NLS) in cold-inducible RNA-binding protein (CIRBP). We show that CIRBP, which lacks any classical NLS, binds both the importin Transportin-1 (TNPO1) and Transportin-3 (TNPO3). These interactions and nuclear import of CIRBP involve two distinct CIRBP regions, the arginine-glycine(-glycine) (RG/RGG) region and the discovered arginine-serine-tyrosine (RSY)–rich region. We show that these two regions harbor different specificity toward TNPO1 and TNPO3, with the RG/RGG-NLS being specialized in TNPO1 recognition and the RSY-NLS being specialized in TNPO3 recognition.
Identification of MLKL membrane translocation as a checkpoint in necroptotic cell death using Monobodies
Authors: Petrie Emma J. , Birkinshaw Richard W. , Koide Akiko , Denbaum Eric , Hildebrand Joanne M. , Garnish Sarah E. , Davies Katherine A. , Sandow Jarrod J. , Samson Andre L. , Gavin Xavier , Fitzgibbon Cheree , Young Samuel N. , Hennessy Patrick J. , Smith Phoebe P. C. , Webb Andrew I. , Czabotar Peter E. , Koide Shohei , Murphy James M.
Published: March 2020

The necroptosis cell death pathway has been implicated in host defense and in the pathology of inflammatory diseases. While phosphorylation of the necroptotic effector pseudokinase Mixed Lineage Kinase Domain-Like (MLKL) by the upstream protein kinase RIPK3 is a hallmark of pathway activation, the precise checkpoints in necroptosis signaling are still unclear. Here we have developed monobodies, synthetic binding proteins, that bind the N-terminal four-helix bundle (4HB) “killer” domain and neighboring first brace helix of human MLKL with nanomolar affinity. When expressed as genetically encoded reagents in cells, these monobodies potently block necroptotic cell death. However, they did not prevent MLKL recruitment to the “necrosome” and phosphorylation by RIPK3, nor the assembly of MLKL into oligomers, but did block MLKL translocation to membranes where activated MLKL normally disrupts membranes to kill cells. An X-ray crystal structure revealed a monobody-binding site centered on the α4 helix of the MLKL 4HB domain, which mutational analyses showed was crucial for reconstitution of necroptosis signaling. These data implicate the α4 helix of its 4HB domain as a crucial site for recruitment of adaptor proteins that mediate membrane translocation, distinct from known phospholipid binding sites.
Wild chimpanzees exhibit humanlike aging of glucocorticoid regulation
Authors: Emery Thompson Melissa , Fox Stephanie A. , Berghänel Andreas , Sabbi Kris H. , Phillips-Garcia Sarah , Enigk Drew K. , Otali Emily , Machanda Zarin P. , Wrangham Richard W. , Muller Martin N.
Published: March 2020

Cortisol, a key product of the stress response, has critical influences on degenerative aging in humans. In turn, cortisol production is affected by senescence of the hypothalamic–pituitary–adrenal (HPA) axis, leading to progressive dysregulation and increased cortisol exposure. These processes have been studied extensively in industrialized settings, but few comparative data are available from humans and closely related species living in natural environments, where stressors are very different. Here, we examine age-related changes in urinary cortisol in a 20-y longitudinal study of wild chimpanzees (
n
= 59 adults) in the Kanyawara community of Kibale National Park, Uganda. We tested for three key features of HPA aging identified in many human studies: increased average levels, a blunted diurnal rhythm, and enhanced response to stressors. Using linear mixed models, we found that aging was associated with a blunting of the diurnal rhythm and a significant linear increase in cortisol, even after controlling for changes in dominance rank. These effects did not differ by sex. Aging did not increase sensitivity to energetic stress or social status. Female chimpanzees experienced their highest levels of cortisol during cycling (versus lactation), and this effect increased with age. Male chimpanzees experienced their highest levels when exposed to sexually attractive females, but this effect was diminished by age. Our results indicate that chimpanzees share some key features of HPA aging with humans. These findings suggest that impairments of HPA regulation are intrinsic to the aging process in hominids and are side effects neither of extended human life span nor of atypical environments.
Influences of language input and production on the language skills of Persian-English bilingual immersion preschool children
Authors: Payesteh Bita , Finestack Lizbeth H.
Published: March 2020

The purpose of this study was to better understand bilingualism in Persian-English preschool-aged children, and
how their language performance across two domains of language related to their language production and parental language
input. Participants were 15, 2- through 5-year old Persian-English bilingual children attending a Persian immersion preschool in
the U.S. The participants completed a battery of language tasks in English and Persian and participants’ parents provided language
input and production information. Data indicate that greater input in the heritage language outside school, Persian, will likely
lead to better Persian skills, while greater English input may negatively affect the children’s Persian skills. Participants
received consistent native-level Persian input in school, yet the results suggest that Persian as a heritage language in the U.S.
may be susceptible to the same vulnerability that affects other non-mainstream languages.
Effect of Mn on precipitation behaviour of NiAl phase in Fe–NiAl steels
Authors: Li Jiaobao , Xiong Xiangyuan , Shen Qin , Zhai Qiankun , Liu Wenqing
Published: March 2020

The microstructural evolution of two model alloys, Fe–NiAl and Fe–NiAl–Mn, during aging at 500°C was investigated using atom probe tomography (APT). Vickers micro hardness measurements showed that the addition of Mn increased the hardness and decreased the time to reach the peak hardness. Both alloys exhibited a softening process at the initial stage of aging. The APT results showed that adding Mn increased the number density of NiAl nanoparticles significantly, and Mn atoms partitioned into the NiAl nanoparticles, occupying the Al sites preferentially. The precipitation of NiAl nanoparticles was accelerated by the addition of Mn because Mn increased the nucleation driving force for NiAl precipitates and reduced the strain energy for the nucleation.
VE-cadherin endocytosis controls vascular integrity and patterning during development
Authors: Grimsley-Myers Cynthia M. , Isaacson Robin H. , Cadwell Chantel M. , Campos Jazmin , Hernandes Marina S. , Myers Kenneth R. , Seo Tadahiko , Giang William , Griendling Kathy K. , Kowalczyk Andrew P.
Published: March 2020

Tissue morphogenesis requires dynamic intercellular contacts that are subsequently stabilized as tissues mature. The mechanisms governing these competing adhesive properties are not fully understood. Using gain- and loss-of-function approaches, we tested the role of p120-catenin (p120) and VE-cadherin (VE-cad) endocytosis in vascular development using mouse mutants that exhibit increased (VE-cadGGG/GGG) or decreased (VE-cadDEE/DEE) internalization. VE-cadGGG/GGG mutant mice exhibited reduced VE-cad-p120 binding, reduced VE-cad levels, microvascular hemorrhaging, and decreased survival. By contrast, VE-cadDEE/DEE mutants exhibited normal vascular permeability but displayed microvascular patterning defects. Interestingly, VE-cadDEE/DEE mutant mice did not require endothelial p120, demonstrating that p120 is dispensable in the context of a stabilized cadherin. In vitro, VE-cadDEE mutant cells displayed defects in polarization and cell migration that were rescued by uncoupling VE-cadDEE from actin. These results indicate that cadherin endocytosis coordinates cell polarity and migration cues through actin remodeling. Collectively, our results indicate that regulated cadherin endocytosis is essential for both dynamic cell movements and establishment of stable tissue architecture.
We are here for you and ready to hear from you
Authors: Nathan Carl F. , Nussenzweig Michel C. , Pulvirenti Teodoro
Published: March 2020

Peer review at JEM during COVID-19
Progress of nanopositioning and nanomeasuring machines for cross-scale measurement with sub-nanometre precision
Authors: Manske E , Fröhlich T , Füßl R , Ortlepp I , Mastylo R , Blumröder U , Dontsov D , Kühnel M , Köchert P
Published: March 2020

Nanopositioning and nanomeasuring machines (NPM-machines), developed at Technische Universität Ilmenau, have provided high-precision measurement and positioning of objects across ten decades, from 20 pm resolution up to 200 mm measuring range. They work on the basis of the error-minimal, extended six degrees of freedom Abbe-comparator principle, with high-precision fibre-coupled laser interferometers and optical or atomic force probes. These machines are suitable not only for measuring but also for positioning with an outstanding sub-nanometre performance.

Measurements on precision step heights up to 5 mm show a repeatability of 20 pm. Consecutive step positioning of 80 pm can be demonstrated. With the new approach of an atomic clock-stabilized He–Ne-laser via a high-stable-frequency comb, we achieve a frequency stability of less than 300 Hz, respectively 0.6 ċ 10−12 relative frequency stability within 1 h at an integration time of 1 s. For the first time, we can demonstrate a direct, permanent and unbroken chain of traceability between the laser interferometric measurement within an NPM-machine and a GPS satellite-based atomic clock. This paper presents a closer insight into the scientific and metrological background as well as unrivalled measurement results, and discusses the great possibilities of this new technology.
Revisiting the detection rate for axion haloscopes
Authors: Kim Dongok , Jeong Junu , Youn SungWoo , Kim Younggeun , Semertzidis Yannis K.
Published: March 2020

The cavity haloscope has been employed to detect microwave photons resonantly converted from invisible cosmic axions under a strong magnetic field. In this scheme, the axion-photon conversion power has been formulated to be valid for certain conditions, either Q
cavity ≪ Q
axion or Q
cavity ≫ Q
axion. This remedy, however, fails when these two quantities are comparable to each other. Furthermore, the noise power flow has been treated independently of the impedance mismatch of the system, which could give rise to misleading estimates of the experimental sensitivity. We revisit the analytical approaches to derive a general description of the signal and noise power. We also optimize the coupling strength of a receiver to yield the maximal sensitivity for axion search experiments.
Effect of calcination temperature on catalyst performance in landfill leachate treatment
Authors: Shi Liang , Zhuang Mingjie , Zhang Yongli
Published: March 2020

In this study, the landfill leachate was treated by Catalytic wet air oxidation, and the heterogeneous catalyst Fe-Co-Ru-Ce/γ-Al2O3 was prepared. The calcination temperatures were respectively set at 300, 450, 600, 750 and 900 °C, and the Fe-Co-Ru-Ce/γ-Al2O3 impregnated with the four metal salt solutions was calcined at the set temperature for 3 h to study the effect of calcination temperature on the activity of the catalyst.The results showed that when the calcination temperature was 450 °C, the activity of the catalyst reached the maximum. At this time, the COD removal rate, decolorization rate and turbidity removal rate of the treated water samples were the highest, which were 78.1%, 60.4% and 92.7%, respectively.
Performance and Parameter Optimization of Self-piercing Riveted Joint for Aluminum Alloy Plate
Authors: Zhong Jiabin , Zhang Yihuai , Shi Baijun
Published: March 2020

Self-piercing riveting is a connection technology to achieve efficient connection of aluminum alloy plates, and the quality of the connection mainly depends on the rivet and mold parameters. This paper establishes a self-piercing riveting simulation analysis model based on the ALE method, and verifies the accuracy of the model by comparing the simulation and experimental results. Five parameters such as rivet length and mould radius are selected, and the undercut amount, bottom thickness, remaining thickness, and tensile shear capacity are used as evaluation indexes to research the main factors that affect the joint forming quality, and an effective optimization scheme is proposed.
Experimental study on a new type of cutting fluid based on hexadecyl dimethyl-ammonium bromide
Authors: Yang Yong , Xiong Li , Li Ang
Published: March 2020

The theory of superlubricity brings a new idea and direction to solve the problem of wear and tear of high-speed cutting tools. According to the superlubricity theory, a new type of cutting fluid based on hexadecyl dimethyl-ammonium bromide was developed by combining superlubricity agent and cutting fluid. Furthermore, taking the cutting of titanium alloy as the object, high speed cutting tests of the new type of cutting fluid were carried out. Finally, a large number of comparative analyses were carried out based on the experimental results. The research shows that the new type of cutting fluid has better cooling and lubrication effect, and can play a good role in reducing friction of cutting tool and improving surface quality of workpiece. The optimum concentration range of hexadecyl dimethyl-ammonium bromide is 2%-4%.
Research progress on application of spray-type damping coating
Authors: Lin Chong , Shi Lei , Zhang Ling , Wang Bing , Cheng Wei
Published: March 2020

This paper analyzes the current control requirements of mechanical vibration and noise in the fields of ships. The author briefly introduces the working principle and main classification of damping coatings, and describes the current domestic and international aspects from the types of spray-type damping coatings and spraying processes. The research progress and application of spray-type damping coatings such as asphalt damping coating, PVC based damping coating, polyurethane based damping coating, waterborne acrylic based damping coating and IPN damping coating and metal alloy coating are reviewed. The development trend and application considerations are summarized in this paper at last.
Study on the preparation and modification of chalcogenide MoS2
Authors: Chen Xueman , Shi Liang , Zhang Yongli , Wang Junfei
Published: March 2020

Two-dimensional material MoS2is another research hotspot following the layered compound graphene. MoS2has the advantages of low cost, non-toxicity, large specific surface area, high reaction activity and good photocatalytic effect. In this paper, the preparation methods of MoS2are reviewed. They are mainly divided into top-down method, bottom-up method and the modification methods including morphology control, co-catalyst combination, non-metallic or metal doping, phase transition and crystal shape adjustment adopted by researchers to solve the problems of MoS2which is easy to accumulate and the high composite ratio of photogenerated electrons and holes.
Measurement of Thermal expansion coefficient of solid Materials by double slit Interferometric method
Authors: Hao Xiulu , Yang Guijuan , Wang Lina , Tang Delong , Zhou Dan , Mei Yan
Published: March 2020

Thermal expansion coefficient is a regular coefficient to describe the variation of geometric characteristics of matter under the action of thermal expansion and cold shrinkage effect, and it is an important index to measure the thermal stability of materials. A device for measuring the thermal expansion coefficient of solid materials by Yang’s double slit interferometric method with variable double slit spacing is mainly composed of laser, sliding Young double slit structure, temperature measuring and controlling instrument, shading tube, receiving device and solid material to be measured. The solid material is heated by ring heater, the temperature of solid material is displayed and controlled by temperature measuring and controlling instrument, and the change of stripe spacing is recorded by linear CCD image sensor. Compared with the traditional optical leverage method, this measuring device and method can significantly improve the accuracy of the measurement results and reduce the uncertainty of the measurement results.
Experiment Research on the Mechanical Performance of Alkali-activated Slag Cementitious Material
Authors: Su Qing , Tao Zhixiong
Published: March 2020

The influence of three different kinds of alkali (sodium hydroxide, sodium sulfate and water glass) excitation agents on the mechanical properties of slag cement materials has been studied by compressive test. The results show that the effect of excitation of sodium silicate is better than that of sodium hydroxide and sodium sulfate, with the increase of alkali equivalent excitation agent, compressive strength of mortar specimens remarkably, compared with alkali equivalent of 3.1% of the sodium sulfate, the 28d compressive strength of mortar specimens with alkali equivalent of 4.65% and 6.2%, has been increased by 140% and 31.5% respectively.
Optical properties of hybrid quasiperiodic Fibonacci photonic crystals
Authors: Zhong Yibing , Shi Shengli , Gao Mingxing , Wang Yuhao , Lv Chunyan , Dong Daxing
Published: March 2020

In this paper, we exploit new optical properties of hybrid quasiperiodic Fibonacci photonic crystals by the transfer matrix method. The quasiperiodic photonic crystals are consist of various generation orders of photonic crystal series that follow the Fibonacci sequence. By regarding the building blocks like S
3, S
4, S
5 as a unit cell (S
3
S
4
S
5) of photonic crystals, we get multiple bandgaps in its spectrum. Furthermore, the bandgaps of the Fibonacci hybrid photonic crystals are tunable by merely altering the refractive index of the dielectric materials. The proposed configuration is a promising candidate as a multichannel filter and a refractive index sensor in the field of integrated photonic circuits.
Suspended-ultrathin Si membrane on SOI: a novel structure to reduce thermal stress of GaN epilayer
Authors: Song Yuzi , Wang Kejia , Du Pengwei , Cheng Zhiyuan
Published: March 2020

A 30nm-thick suspended-ultrathin silicon membrane based on SOI (silicon-on-insulator) substrate for GAN epitaxial growth is fabricated and analysed. We demonstrate that thermal stress of GaN in the effective area on this novel substrate can be reduced 44% more than that in normal SOI substrate, which can reduce the dislocation and crack density in GaN. The absence of BOX (buried oxide) layer are confirmed as main factors to result in reduction of thermal stress in GaN layer. This work provides a promising approach to obtain high-quality GaN by utilizing mechanical structure.
Influence of ubiquitiform complexity on fracture energy of concrete
Authors: Ju Yibo , Ou Zhuocheng , Duan Zhuoping , Huang Fenglei
Published: March 2020

The crack extension path of concrete materials was simulated numerically based on the non-uniform numerical model of Weibull distribution, and the complexities of various ubiquitiform fracture surfaces were calculated to explore the relationship between complexity and fracture energy. To study the influence of specific crack extension law and fracture mode on the relationship between the complexity and fracture energy, numerical simulation of the crack extension was carried out based on the numerical model with random aggregate distribution, and the reason for the change of the relationship between complexity and fracture energy were discussed.
Experimental study on three-point bending performance of CFRP shaft embedded FBG sensor
Authors: Wang Xianfeng , Li Wang , Ding Guoping , Yan Xiaoyu , Yue Shengyuan
Published: March 2020

The bending deformation of Carbon Fiber Reinforced Polymer (CFRP) shaft is one of the important indicators reflecting its performance. Monitoring the deformation of CFRP shaft under different loads is of great significance for the optimal design of CFRP shaft. Fiber Bragg Grating (FBG) sensor is small in diameter, easy to be embedded inside the CFRP shaft, which has little influence on the structure itself. In addition, it can realize "one fiber multi-point" measurement, which is very suitable for the internal monitoring of anisotropy composites. This paper proposes a pre-embedded FBG sensor to monitor CFRP shaft strain. Prepared CFRP shaft test piece. Four FBG sensors are embedded inside the shaft, and four FBG sensors and four strain gauges are pasted on the surface of the shaft. The CFRP shaft was subjected to three-point bending loading on a universal testing machine. The strain data obtained by FBG sensor and strain gauge under various loads were compared and analyzed. The feasibility and accuracy of the embedded FBG sensor to monitor CFRP shaft strain were verified.
Microstructure and mechanical properties of Hastelloy-X produced by selective laser melting
Authors: Zhang Dayue , Wang Shaolin , Zhang Hualiang , Tan Chunqing , Gao Qing , Liu Xiyang , Cui Zhaowen
Published: March 2020

The microstructure including defects and mechanical properties of as-deposited and heat treated (HT) Hastelloy-X manufactured by selective laser melting (SLM) technology were studied, in order to apply this technique into the manufacturing of gas turbine components. The processing parameters, including scan speed, laser power, scan spacing, and linear energy density were optimized to obtain less porosity. Heat treatment at different temperatures and times was executed to modify the microstructure and reduce the residual stress. When the linear laser energy density increased (>0.12 J/mm), the porosity decreased to ~0.5 %. By decreasing scan spacing to 0.06 mm, the porosity was further decreased to 0.2 %. With increased HT temperature, the microstructure changed from columnar grains through partial recrystallized grains to fully recrystallized coarsened equiaxed grains. Hardness decreased with increasing HT temperature and time in the HT conditions mainly due to grain coarsening and carbide reduction.
Experimental study on tensile properties of steel casing welding
Authors: Zhu Zhenyu , Yang Yi
Published: March 2020

In order to study the tensile properties of steel casing welding, static tensile tests were carried out on 12 welded specimens.The load-displacement curve was obtained, and its bearing capacity, yield strength and tensile strength were studied.The test results show that this method is a feasible welding method. The tensile properties of the test piece are similar to those of the base metal, and the fracture is ductile fracture.
Comparison of soil classification methods among domestic and oversea based on CPTU test
Authors: Wang Junpeng , Wang Bingkang
Published: March 2020

This article presents the comparison of two soil classification methods among domestic and oversea based on CPTU test in geotechnical practice of soft deposit subgrade. Although CPTU test exists earlier in the world, However, CPTU test has been not applied in geotechnical practice of road subgrade until in recent years in China. Two soil classification methods among domestic and oversea are applied to soil classification and differences of them are analyzed.
Study on tensile properties of rice straw rope considering degradation
Authors: Tang Peng , Qi Yongzheng , Ding Yu-xuan , Hao Zijin , Xu Guizhong
Published: March 2020

Many scholars have used crop straw to reinforce soft soil foundation and studied its reinforcement effect and mechanism. However, the crop straw will degrade in the soil for a long time, which reduces the tensile strength of the straw and weakens the shear resistance of the reinforced soil. In order to study the degradation law of rice straw rope and its influence on tensile properties, the straw rope was immersed in water for different time, and then taken out, the quality before and after immersion was measured and tensile test was carried out. The results showed that: the degradation of rice straw rope in water experienced two stages of rapid degradation and slow degradation, and the quality of loss in the rapid degradation stage was more; the tensile force of straw stalk rope increased slowly with the increase of tensile displacement. When immersed for 20 days, the failure mode was brittle failure, and after 40 days of immersion, the failure mode changed into ductile failure; the straw stalk rope was the main tensile force of the straw fiber, and the tensile strength peak decreased with the increase of the immersion time. The deterioration law accorded with the third-order polynomial function.
Tree 101 block CO2 Minimum miscibility pressure slim tube test
Authors: Liu Li , Pi Yanfu , Liu Yingjie , Zhou Shixin , Guo Xuan , Wang Dewei , Meng Zetian
Published: March 2020

Determining the minimum miscibility pressure is the main research content of CO2 mixed phase displacement. It is a key indicator of whether the formation fluid can reach the miscible phase. There are many ways to determine the minimum miscibility pressure. At present, the laboratory test measures the minimum miscibility pressure of CO2-crude oil. The accepted industry standard is the slim tube test. This paper is aimed at the reservoir profile of Tree 101 block in Yushulin Oilfield. Carry out a slim tube test to determine the minimum miscibility pressure of 32.43MPa.
A study of spectral behaviors of turbulent wall-pressure fluctuations
Authors: Wang Jie , Yu Jiao , Zhu Yanying , Guo Kaixuan
Published: March 2020

Turbulent wall-pressure fluctuations are major sources of noise and their numerical calculations have been important topics in engineering fields. In this paper, large eddy simulation is conducted to study spectral behaviors of turbulent wall-pressure fluctuations. The roughness was simulated by using an array of 10 off-set square columns extending in the vertical directions on the bottom surface, and local downstream aerodynamic fields were numerically investigated. The wind speed fluctuations in the flow field and the pressure fluctuations at the bottom of the flow field are monitored at a certain cross-section when varying square column heights and wind turbulence conditions at the wind speed inlet. Frequency spectral characteristics are analysed and the influence factors of wall-pressure fluctuations are explored.
Study on lithology identification method of carboniferous in the west wing chepaizi salient in western margin of junggar basin
Authors: Wang Yong , Kong Xiangchao , Tang Dong , Li Jing , Zhang Hansheng
Published: March 2020

Reservoir characteristics are important indexes for oil and gas exploration and development. Therefore, the identification of igneous lithology of target formation is carried out by using intersection diagram and mechanical parameter method according to the Carboniferous logging data of the west wing chepaizi salient in western margin of junggar basin. The results show that the study area is dominated by volcanic clastic rocks and sedimentary rocks. The cross-section and mechanical parameters method can be used to identify the lithology and obtain the corresponding physical parameters. Finally, this work has guiding significance for the exploration and development of Carboniferous reservoirs in the west wing chepaizi salient in western margin of junggar basin.
Evolutionary Game Analysis of Engineering Construction Innovation and Local Government Environmental Regulation Strategy
Authors: Yan Xiaoming
Published: March 2020

Recent years, with the development of China, an incessant springing up of major engineering projects. Based on the characteristics of the decentralization of local governments in China, whether there are local governments competing to set up major engineering projects at the expense of the environment in order to maintain local economic development. From the perspective of evolutionary game, this paper constructs a game model between engineering construction innovation and local government under the influence of local government’s choice of different environmental regulations. Through the dynamic replication equation, the behavior selection path and evolution strategy of local government and engineering construction firms are obtained. The research results show that the strict environmental regulation of local governments and the technological innovation of engineering construction firms can achieve stability at the same time, and the conditions are effective government investment by local governments.
Importance Evaluation of C4ISR Communication Nodes Based on Multi-attribute Decision-making
Authors: Li Fangsheng , Hou Jianfeng , Qu Lianzheng , Fan Binbin
Published: March 2020

Node importance is a key measuring index for network structure characteristics. Evaluating the nodes importance can locate key nodes of the network and provide support for network node planning. The importance of the C4ISR communication node reflects the dependence degree of the functional nodes and functional links on the C4ISR transport nodes. How to transform this qualitative dependence into quantitative dependency measuring is the core problem of evaluating node importance and locating key nodes. Based on the quantitative dependence measuring, this paper proposes a C4ISR communication node importance evaluation method based on multi-attribute decision-making. Meanwhile, the applicability of the method is verified by examples.
Research on Optimization of Stereo Garage Parking Location Based on Genetic-Tabu Search
Authors: Li Bowen , Li Jianguo , Yang Bo
Published: March 2020

In order to solve the disadvantages of long queue and low efficiency of vehicles access in the plane mobile stereo garages. A hybrid algorithm of genetic algorithm to optimize tabu search is proposed to optimize the parking space allocation strategy of the garage. Aiming to shorten the vehicle average waiting time and the working distance of the carrier in the process of vehicle access, the mathematical model of the stereo garage is established through the investigation and data extraction of the actual running stereo garage. We compared the experimental simulation data of the genetic-tabu search hybrid algorithm and the tabu search algorithm. The experimental results indicate that: the Genetic-Tabu search hybrid algorithm has better convergence, which can effectively optimize the location allocation mode of the stereo garage, shorten the vehicle average waiting time and the working distance of the carrier. It has important application value.
Speed and Rotor Position Identification of Permanent Magnet Synchronous Motor Based on ADRC
Authors: Sun Diansheng , Xu Mingqing
Published: March 2020

Aiming at the accurate estimation of rotor speed and position of surface- mounted permanent synchronous motor, a scheme using extended state observer in the two phase static frame is constructed. The conventional method estimating the rotor speed and position in two phase synchronized rotation reference frame has the problem of error accumulation of the estimated rotor position which was calculated by angular velocity estimated value integral. This method avoids those problems and has advantages. The speed and current closed loop control system is constructed by using the auto disturbance rejection controller to replace the PI regulator. The simulation results validate the accuracy of the rotor speed and position is higher, and the system is stable and has good disturbance rejection performance.
Improved voltage scanning method for maximum power point under partial shadow conditions
Authors: Ding Wenfang , Yu Shiqi
Published: March 2020

This paper proposes a novel maximum power point tracking (MPPT) algorithm with global search. The algorithm combines global voltage sweep and incremental conductance method, and introduces a Judging factor as a criterion for global voltage scanning. The Judging factor is compared with the threshold and the scan step size is selected based on the result. Take a large step when far from the peak. When approaches the peak, uses the incremental conductance method to find the local extrema and store it, then continues scanning. When the output power is close to zero, the scan is complete, Comparing all local extrema points then the global maximum power point will be found by this algorithm. Matlab simulation results show that the algorithm can find the global maximum and the search speed is fast.
Structure Optimization of Gas-Liquid Separator Based on STAR CCM+
Authors: Liang Qiufeng , Xiao Changrun , Zhang Lu , He Senlin
Published: March 2020

At present, most of the submarine air compressors at home and abroad are directly discharged into the cabin when they blow off the condensed water and oil, resulting in environmental pollution in the cabin and corrosion of surrounding parts. In order to solve this problem, this paper studies the condensate drain device of submarine air compressor. STAR CCM + based on CFD method is adopted to analyze the flow field of two-phase gas-liquid separator. The reliability of STAR CCM + numerical simulation is verified by comparing with the existing test data [1]. On this foundation, combined with submarine cabin space and condensate discharge characteristics of submarine air compressor, the structure of gas-liquid separator is optimized. Focus on the analysis of flow field distribution and gas-liquid separation effect in the case of different baffles and the presence or absence of baffles. The results show that when the inlet dryness is 0.7, the bottom baffle of the separator can make the internal flow field more stable; the dryness of separator gas outlet can reach 0.99 with four-turn spiral deflector and the bottom mounted baffle. The result of numerical simulation can provide a valuable reference for the design of the condensate drain device of submarine air compressor.
FEM analysis of the distortion of thin-walled sealing part affected by the machining-induced residual stress
Authors: Fan Zhiqiang , Cao Lixin , Liu Feng
Published: March 2020

Thin-walled sealing parts are typical difficult machining parts due to their lower stiffness and higher machining accuracy requirements. Among all the influential factors on the distortion of thin-walled parts, machining-induced residual stress (MIRS) plays a key role. In this paper, the effects of the MIRS changed with the number of cuts and the allocation of cutting depth on the distortion of the sealing part are investigated. Firstly, the MIRS is obtained by a finite element cutting simulation model of the AISI304L stainless steel material. Then, the obtained MIRS is applied to the workpiece, and the distortion of the workpiece is simulated after releasing the clamping constraints. The simulation results show that the multi-cutting processes and the reasonable allocation of cutting depth have a remarkable influence on the control of the workpiece distortion.
Summary of research on road roughness
Authors: Zhou Wei , Zhu Changjian , Li Wen , Ge Haoran
Published: March 2020

Road roughness is a key factor affecting vehicle ride comfort and occupant comfort. It is the basis for road grade evaluation and also determines the dynamic load of the vehicle. Measuring road unevenness is often used to evaluate the quality of road construction. However, with the development of smart cars, in order to adjust the speed and suspension parameters in real time according to the road roughness, to improve the ride comfort, the method for measuring the road unevenness in real time becomes New research hotspots. This paper firstly introduces the indicators and standards for evaluating road roughness, and then summarizes the research progress and direction of road roughness from both direct measurement and indirect identification. Among them, the methods of non-direct identification of road roughness are highlighted, which are classified into laser sensor based recognition, vibration model based recognition and neural network based recognition.
Power optimization method for wireless power transmission system based on improved differential evolution algorithm
Authors: Tian Yu , Li Tinghui
Published: March 2020

In this paper, we proposes a power optimization algorithm in view of the Differential Evolution algorithm (DE) in order to reduce the transmission power due to the frequency split of the electromagnetic coupling resonant radio energy transmission system in the over-coupled state. Simulation experiments in MATLAB environment verify the effectiveness of the algorithm for power optimization of transmission system. Simulation experiments show that compared with the standard Differential Evolution algorithm and adaptive control parameter Differential Evolution algorithm (JDE), a new adaptive Differential Evolution algorithm (NDE) is improved based on the standard Differential Evolution algorithm. The new algorithm enables the system to find the optimal load power faster, which is conducive to increasing the output power of the system.
Investigation on cooling performance of a composite cooling turning tool based on CFD and Taguchi method
Authors: Shu Shengrong , Xiao Caiwei , Qi Xiaoning , Zhang Yu , Liu Leping
Published: March 2020

In order to decrease the cutting temperature and assist the chips removal while reduce or eliminate the generation of cutting waste liquid in metal cutting process, a novel turning tool cooled by combining circulating internal cooling with spray cooling is proposed. In this paper, the cooling performance of the composite cooling tool is investigated by the combination of CFD based thermal-fluid-solid coupling analysis which were carried out by Fluent and Taguchi design. A discussion on the influence of cooling parameters on the cooling performance of the composite cooling tool is conducted. The results show that the order of the influence of each parameter on the cutting temperature is as follows: coolant temperature of circulating internal cooling, spray pressure, air temperature of spray cooling, coolant flow rate of circulating internal cooling and coolant flow rate of spray cooling. The optimal parameters in this study are: spray pressure is 0.45 MPa, coolant flow rate of spray cooling is 150 ml/h, air temperature of spray cooling is 2 °C, coolant flow rate of circulating internal cooling is 2 m/s, coolant temperature of circulating internal cooling is 2 °C.
Formation Regularity of Annular Shaped Charge Jet by Numerical Simulation
Authors: Xi Liping , Li Mei , Wang Shuyou , Jiang Jianwei , Men Jianbing , Sun Shengjie
Published: March 2020

Formation process of an annular-shpere liner driven by shaped charge has been studied using AUTODYN numerical simulation software. Research works of factors, including length to diameter ratio of charge, detonation radius and distance between liner and shell, that affect the jet head velocity, deflection angle, and head diameter have been implemented. The results show that the liner driven by shaped charge initiated annularly will be shaped into a annular jet which can form a large-diemeter hole on the target, while the liner forms a converged jet when shaped charge is centrally initiated. As the ratio and the initiation radius increase, the jet diverges; as the distance between the liner and the shell increases, the jet converges.
Research on Talents Training Mode of Local Applied Undergraduate Universities under the Background of New Engineering
Authors: Feng Hong , Ru-Ru Liu , Zuo Sun , Ye – Wang Qian
Published: March 2020

With the double wave of the new industrial revolution and the new economic revolution, traditional engineering education faces unprecedented challenges. The traditional engineering training model and the cultivated talents cannot adapt well to the needs of the industrial revolution under the new situation. Under the background of new engineering construction, the development of local applied universities has ushered in tremendous development opportunities. This paper studies the talents training mode of local applied universities, and proposes the integration of deep production and education, enterprise modular practice training, and multi-faceted training mode. reform. “Reform and Development Education First," China’s engineering education must seize the opportunities of new industry development and new technology innovation, take into account the recent and long-term development needs of the engineering field, and vigorously promote the reform of the talent training model, thereby promoting the national and regional human capital structure. The upgrade will help transform the economic model from a traditional economy to a new economy.
An Improved Anti-counterfeiting Printed QR Watermarking Algorithm Based on Self-Adaptive Genetic Algorithm
Authors: Xie Rongsheng , Huang Pengcheng
Published: March 2020

To solve watermarking parameters optimization problem and enhance anti-counterfeiting performance, a self-adaptive genetic algorithm is proposed and introduced to improve robust QR code watermarking scheme. In the improved scheme, we adaptively change the genetic algorithm procedure according to the relation between the maximum fitness value and the average fitness value of a population. With the improved genetic algorithm procedure, it is easier to get better diveisity. In addition, mutation probability as well as crossover probability is adaptively modified to quickly seek out the optimal watermarking parameters. The tests indicate that the decoding rate of QR code noticeably increases without degrading detecting rate of digital watermark with the improved anti-counterfeiting printed QR code watermarking scheme.
The Application of building information management platform in prefabricated building production stage
Authors: Li Jie
Published: March 2020

By studying and analysing the application status of information management platform in prefabricated building production phase, the paper summarizes the management and quality problems of prefabricated building components in the production phase, puts forward the use of BIM technology to simulate the production of components in the prefabricated production chain, and Uses the information platform to supervise the production process of components. Based on the problems of prefabricated buildings in the production stage and the characteristics of BIM information platform, this paper analyses that the construction information management platform can bring benefits to participants of prefabricated buildings in the production stage.
On the reverse mortgage in China: An Empirical Analysis Based on risk neutral pricing method
Authors: Dai Kaichuang
Published: March 2020

“Reverse mortgage loan of housing" refers to the mortgage of housing property rights to financial institutions by the elderly with housing property rights. After comprehensive evaluation of borrower’s age, expected life, the present value of house, future appreciation and depreciation and other situations, the value of the house is divided into parts, and the cash is paid to the borrower on a monthly or annual basis until the borrower’s death.
Digital Exploration of Sports Cultural Heritage of Guangdong People’s Stadium
Authors: Mao Wenwu , Zhang Jie , Dong Xingtuan , An Nannan , Zhang Kexin , Zhang Zewen , Wu Siyuan , Che Jiang
Published: March 2020

Guangdong People’s Stadium, known as the “living fossil of sports culture in the South of the Five Ridges”, is one of the most ancient stadiums in China. It owns a history of over 1400 years from the “Yuewutang” in Tang Dynasty in 618AD, and has left abundant sports cultural heritage. However, many precious sports cultural heritages have been damaged and lost over time. This paper makes a digital exploration of sports cultural heritage of Guangdong People’s Stadium based on image processing technology, 3D modeling technology, 3D scanning technology and action simulation technology in combination with software such as Photoshop, SolidWorks, Geomagic and CATIA. It may help protect and carry forward the sports culture of Guangdong People’s Stadium and even the South of the Five Ridges.
Research on the Reliability of Internet of Things Information Transmission for Bus bar Operation on-line Monitoring
Authors: Zhang Yecheng , Zhou Guigen , Yang Ning
Published: March 2020

Aiming at the problem of packet loss in information transmission for on-line monitoring of bus bar operation status, the factors influencing the reliability of information transmission are analyzed from three aspects: The physical structure of monitoring system, communication protocol and the topological structure of information transmission network. A routing quality evaluation model is constructed, and a highly reliable path selection algorithm for information transmission is proposed. The results show that the model and algorithm proposed in this paper not only can greatly reduce the packet loss rate in the Internet of Things, but also effectively solve the problem of information transmission reliability of on-line monitoring system for bus bar operation status. Furthermore, an example of reliable information transmission for other Internet of Things applications is provided.