bluuebunny/crossref_metadata_2025 huggingface dataset:
Mini-Invasive Surgery for Distal Radius Fractures: A Double Incision under 12 mm
Authors: Ribeiro Elisabete , Campanholi Gustavo , Acherboim Marcelo , Ruggiero Gustavo Mantovani
Published: December 2020

Background Distal radius fracture is one of the most common lesions in adults. Surgical techniques have evolved considerably with a clear tendency toward mini-invasive techniques.

Objective Our aim is to push the limits to a 12 mm approach and evaluate its clinical and radiological results.

Patients and Methods Ten fractures in nine patients were operated by a double incision with mean size 11.50 ± 3.41 mm (range 8.00–1.00) and using a specially designed volar distal locking plate.

Results At the latest follow-up, visual analogue scale score for pain (0.20 ± 0.63 during rest and 0.60 ± 1.07 while making efforts) and quick DASH (quick Disabilities of the Arm, Shoulder and Hand) score (6.14 ± 7.43) were extremely low. All the range of motion parameters and grip strength were above the 95% barrier of the contralateral side, with exception of ulnar deviation. Radiological parameters obtained were located within the normal ranges. Time to return to independent daily tasks and work was 6.67 ± 5.15 and 10.14 ± 14.24 days, respectively. One case of transient carpal tunnel syndrome was solved with watchful waiting and one case of extensor tendons impingement was improved after plate removal. All patients were completely satisfied at the end of the treatment.

Conclusion In conclusion, mini-invasive volar technique for distal radius fractures with special designed plates in carefully selected patients allowed us to obtain good clinical and radiological results, minimal complications, fast recovery, and high-satisfactory rates.

Level of Evidence This is a Level IV, case series study.
The Caregiver Reported Autistic Symptoms in Preschool Children: Findings of Chandigarh Autism Screening Instrument (CASI) Linked Screening from North India
Authors: Joseph Jaison , Hooda Komal , Chauhan Indu , Dhull Komal
Published: December 2020

Background Autism is a neurodevelopmental disorder and can be early detected with the aid of screening tools. Chandigarh autism screening instrument (CASI) is a newly developed tool to screen autistic symptoms among children aged between 1.5 to 10 years in the north Indian Hindi speaking population.

Objective In this study, we evaluated the caregiver report of autistic symptoms in preschool children (3–6 years) attending selected schools of Rohtak.

Materials and Methods The index study was conducted among 225 caregivers of school-going children aged between 3 to 6 years. Social and communication disorders checklist (SCDC-Hindi) and CASI was used to measure autistic symptoms. The modified Kuppuswamy scale was used for assessing the socioeconomic status of the caregivers.

Results The autistic symptoms varied from 2.2 to 18.7%, depending upon the CASI (cutoff score of 10) and SCDC (cutoff score of 9) measurements. The items in the shorter four-item version (CASI Bref) of CASI were found to be the predictors of autistic symptoms in this population. Children’s gender, age, and socioeconomic status were not found to have any association with autistic symptoms in this setting.

Conclusion The study provides preliminary evidence in relation to the CASI-linked screening for autistic symptoms among preschool children. The shorter version of CASI (CASI Bref) can be an efficient quick screener for autistic traits, but the full version of CASI needs to be validated as per age-appropriate autism screening tools.
Electron–phonon coupling enhancement and displacive magnetostructural transition in SrCr2
As2 under magneto-Raman spectroscopy
Authors: Kaneko U F , Teodoro M D , Gomes P F , Sangeetha N S , Johnston D C
Published: December 2020

A Raman spectroscopy study on high quality single crystals of SrCr2
As2 (SCA) in the temperature T range 4 K < T < 300 K and high applied magnetic fields up to H = 9 T is presented. The chromium B
1g phonon analysis reveals two anomalous shifts in the frequency, the first below T = 250 K at H = 0 T in the saturated AFM G-type order likely due to an enhanced electron–phonon coupling by the magnetic order, whereas the second anomaly occurs above H = 4 T at T = 4 K likely as a consequence of a magnetostructural displacive transition. Renormalization of the electronic Raman spectra in both studies reveals a decrease in the electronic density of states with decreasing T and increasing H, respectively, with consequent changes in the Fermi surface, which are intrinsically related to the observed anomalies.
Tracking control of two qubit entanglement using piecewise time-independent method
Authors: Delben G J , Beims M W
Published: December 2020

The tracking control of quantum correlations between two coupled qubits is analyzed, where only one of the qubits is coupled to a Markovian environment. Such a system is a generalized model that can be used, for example, to study the problem of a nuclear spin coupled to the electron spin exposed to the environment. Using an external control field, we increase the time for which the system remains coherent and entangled. The control field is an external potential applied to the system, which contains two adjustable parameters, the intensity and the phase of the field. Furthermore, we present quantum control protocols with different targets. First, for population control of both qubits, second for the coherence control of both two-level systems, and finally for the control of entanglement. Due to analytical for X states the target function can directly be identified with the entanglement. Furthermore, we have shown that when smaller dissipation rates are considered, the control method generates larger stable entanglement between the qubits.
A time-delay propagation model for studying illegal crossing behavior of E-bikes on a regular lattice
Authors: Li Qiao-Ru , Lin Qin-Ze , Li Meng-Jie , Chen Liang , Li Kun
Published: December 2020

Violation behavior of e-bikes at the signal intersection is usually induced by the ‘herd effect’, which may easily lead to dangerous accidents. In order to study the propagation mechanism of e-bikes’ illegal crossing, taking the high mobility and flexibility of e-bikes into account, this paper proposes an illegal time-delay model based on the theory of regular Lattice. A typical signal intersection of Guilin was selected as the study subject. Its topological features are analyzed through field survey and video shooting. Further, how the violation behavior of e-bikes with different structural features evolves was investigated. Results show that the herd illegal behavior of e-bikes is sensitively affected by the degree, transmission rate, arrival rate and crossing time. Specifically, a slight increase of any of the above factors will dramatically boost the violation behavior across the whole intersection. This study may give insight into why the illegal crossing of e-bikes prevails, and help to facilitate intersection design and signal control in the future.
The Argo: a high channel count recording system for neural recording in vivo
Authors: Sahasrabuddhe Kunal , Khan Aamir A , Singh Aditya P , Stern Tyler M , Ng Yeena , Tadić Aleksandar , Orel Peter , LaReau Chris , Pouzzner Daniel , Nishimura Kurtis , Boergens Kevin M , Shivakumar Sashank , Hopper Matthew S , Kerr Bryan , Hanna Mina-Elraheb S , Edgington Robert J , McNamara Ingrid , Fell Devin , Gao Peng , Babaie-Fishani Amir , Veijalainen Sampsa , Klekachev Alexander V , Stuckey Alison M , Luyssaert Bert , Kozai Takashi D Y , Xie Chong , Gilja Vikash , Dierickx Bart , Kong Yifan , Straka Malgorzata , Sohal Harbaljit S , Angle Matthew R
Published: December 2020

Objective. Decoding neural activity has been limited by the lack of tools available to record from large numbers of neurons across multiple cortical regions simultaneously with high temporal fidelity. To this end, we developed the Argo system to record cortical neural activity at high data rates. Approach. Here we demonstrate a massively parallel neural recording system based on platinum-iridium microwire electrode arrays bonded to a CMOS voltage amplifier array. The Argo system is the highest channel count in vivo neural recording system, supporting simultaneous recording from 65 536 channels, sampled at 32 kHz and 12-bit resolution. This system was designed for cortical recordings, compatible with both penetrating and surface microelectrodes. Main results. We validated this system through initial bench testing to determine specific gain and noise characteristics of bonded microwires, followed by in-vivo experiments in both rat and sheep cortex. We recorded spiking activity from 791 neurons in rats and surface local field potential activity from over 30 000 channels in sheep. Significance. These are the largest channel count microwire-based recordings in both rat and sheep. While currently adapted for head-fixed recording, the microwire-CMOS architecture is well suited for clinical translation. Thus, this demonstration helps pave the way for a future high data rate intracortical implant.
Development of Electricity Trading Vector Benefit Evaluation Model
Authors: Chang You Yi , Wang Rong Mao , He Xiao Yang , Li Qing Chun
Published: December 2020

In order to ensure the smooth progress of the new round of electricity reform and reduce market operation risks, it is necessary to study the impact of the market rules on the market performance through the power market simulation before the formal implementation of the market rules, in order to test the rationality of the trading rules and discover the existence of the defects in the rules, so as to further optimize and perfect the market design, establish corresponding market risk control strategies, and resolve risks in the stage of market design and rule making. This article is based on the fact that users of production and consumption can trade their own elastic load capacity on the feature vector trading platform, that is, when they respond to the imbalance of distributed generation/power consumption of production and consumption groups, the environmental protection benefits of distributed power generation can be reflected before they can obtain corresponding response power Subsidies for environmental benefits. According to the principle of power trading evaluation, the eigenvector model is used for analysis, and the simulation experiment environment is used to simulate the reasonable range of benefits in power trading, which proves that the research content of this paper is true and effective, and plays a popular role in power trading evaluation.
Design of Self-Healing Control Method for Photo Voltaic Distribution Network of Internet of Things
Authors: Zhang Zhe , Lin Wei , Yu Yang
Published: December 2020

During the construction of photo voltaic grid-connected distribution network, the self-healing control system is generally composed of monitoring computer, communication cable, communication interface, photoelectric converter, bus connector and multi-film optical cable. The remote centralized monitoring is realized by communicating with the local controller of the unit. Its network mode model for industrial Ethernet, communication system and implementation of the need for large-scale but photo voltaic (pv) grid power distribution network with single purpose of large number, wide distribution of the region, and the communication of capital concentration is much higher than power generation capacity of thermal power, hydro power, nuclear power or if based on Internet technology and network, not only can reduce the communication equipment of the implementation of the capital, can also provide follow-up self-healing control rising space.
Research on the design of massive weight satellite transfer platform
Authors: Yang Chunsheng , Ren Zhenyue , Huang Yufeng , Xu Yiliu
Published: December 2020

The new generation of the DFH-5 platform satellite independently developed by China has been successfully launched by CZ-5 launch vehicle in Hainan satellite launch center. Up to now, the satellite has been running smoothly with good functions and services. It is the heaviest satellite launched in China with the highest technical content. In this paper, a kind of transfer platform is designed to meet the transfer requirements of heavy satellites such as the East five platform. The transfer platform is composed of body frame, omni-directional wheel set, console, battery, electric control system, etc. The transfer platform has the functions of independent control, safety detection, accurate positioning, human-computer interaction, etc. through analysis and calculation, the ultimate compression and anti-overturning performance is stable and reliable, meeting the needs of satellite and other tooling during the final assembly test. Then it can reduce the risk of assembly operation and improve the efficiency of assembly test.
Design of New Slotted Structured Grinding Wheel
Authors: Ding Ning , Jiang Shuna , Duan Jingsong , Liu Chao , Cui Shanfu
Published: December 2020

The grinding efficiency of conventional grinding wheel is low, and the phenomenon of grinding burn is serious. Although the ordinary slotted grinding wheel can reduce the grinding temperature, it also reduces the machining accuracy of the workpiece. In view of this problem, a new design scheme of slotted grinding wheel is proposed while only a part of the groove on the grinding wheel is slotted, and the grinding mode of the groove and the non-groove is used to alternate with each other. It is not only beneficial to the entry of grinding fluid to reduce grinding temperature, but also to improve the problem of poor roughness in the machining process of groove grinding wheel.
Optimization of anti-wear performance evaluation method of hydraulic oil based on four-ball machine
Authors: Zhen Penghou , An Haizhen , Chen Li , Liu Min
Published: December 2020

To establish a scientific and effective method for evaluating the anti-wear performance of hydraulic oil, the L9 (34) orthogonal test scheme with 4 factors and 3 levels is rationally designed by using the four-ball machine and combined with the actual working conditions of the hydraulic system of construction machinery. The test and repeated verification are carried out by taking wear scar diameter, wear scar morphology, oil temperature change during the process and abnormal noise as evaluation indexes. The results show that the selected test method (588N, 90min, 75°C, 600r/min) has good discrimination and repeatability for different quality grades of hydraulic oil; this method can realize the quality control of the anti-wear performance of hydraulic oil, and can be used in the research of hydraulic oil in laboratory and the screening method before the bench test, and provide the basis for the rational selection of lubricating oil in hydraulic system.
Welding procedure Research of ASTM B708 R05252 tantalum sheets
Authors: Jiang Cheng-Jun , Zou Xiaohui , Xue Xiaolong , Wang Wei
Published: December 2020

The weldability of ASTM B708 R05252 tantalum sheet was analyzed, and the mechanical properties, bending properties and corrosion resistance of tantalum sheet were tested by GTAW butt welding. Test results show that butt joints by this welding procedure perform good mechanical property, and the metallographic microstructures &corrosion resistance of the welding joint are normal. It expresses the great significance of formulating the welding procedures of tantalum pressure vessels.
Stiffness and Mode Analysis of Framework for an Aerial Inertial Stabilized Platform
Authors: Lang Yuedong , Tian Xiu , Kai Yang , Hou Eryong
Published: December 2020

In the framework structure design of an aerial inertial stabilized platform (AISP), simulation software was used to analyze its stiffness and vibration mode. Its stress and strain distributions and modal characteristics under a large load were obtained. Then, according to the analysis results, its structure optimization design was implemented to meet the requirements of AISP in control precision. The results of optimized analysis showed that the rigidity of optimized frame structure was significantly improved, while its dynamic characteristics were also effectively improved. Therefore, it verified the necessity and feasibility of engineering analysis for the platform structure design, and it could provide a theoretical basis for AISP design.
Comparative Research on Temperature Measurement Methods in Vacuum and Low Temperature Environment
Authors: Liu Jinlong , Zhang Xiaoli , Li Qiong , Wang Qingyu , Li Xiaoxiao , Wang Lei , Hong Chenwei
Published: December 2020

In this paper, two kinds of temperature sensors (platinum resistance and thermocouple) commonly used in vacuum and low temperature (below 100k) are compared. The same data collection method is used. The temperature measurement results are analyzed to obtain some differences in the temperature measurement of platinum resistance and thermocouples under vacuum and low temperature conditions. At the same time, the differences between the two temperature measurement methods are sorted out, and the temperature measurement methods in different environments are given. Some suggestions, and some prospects for future research directions are given.
Optimization design and experimental analysis of bionic viscosity reduction of chisel type energy saving subsoiling shovel
Authors: Huang Weihua , Li Ming , Ge Chang , Wei Lijiao , Niu Zhaojun , Zhu Xianzhong
Published: December 2020

In order to solve the problems of adhesion to soil and high resistance in traditional subsoiling shovel operation, a bionic energy-saving subsoiling shovel with bionic viscosity reducing and resistance reducing chisel is designed based on the polygon geometry structure of pangolin scales. In this paper, the bionic modeling analysis of chisel type energy-saving subsoiling shovel is carried out by using 3D modeling software. According to the simulation analysis data, we optimize the key structural parameters, and try to produce the bionic energy-saving deep scarifier with reducing viscosity and resistance. In order to study the performance of the chisel type energy-saving subsoiling shovel, L9 (34) orthogonal test was carried out in the field with the number of bionic surfaces, coating materials and forward speed as the experimental factors, and the adhesion soil amount and traction resistance as the test indexes. The results show that the order of influence of each factor on the index is the number of subsoiling shovel bionic surface, coating material and advancing speed; the optimal horizontal combination is that the number of bionic surfaces of subsoiling shovel is 10, the coating material is UHMWPE, and the advancing speed is 6km/h.
Collaborative Control Of Power System Based On Source Network Load Storage Management
Authors: Lin Wei , Zhang Zhe , Yu Yang
Published: December 2020

Vertical coordination of charge storage in source network refers to the coordination among energy transmission network, transport resource network and utilization and development of resources and energy through energy flow, information flow interaction and energy conversion technology, which plays a role in unifying user energy demand, expanding power demand side management function and amplifying power demand side operation. In this paper, the differential equations are combined with the power system circuit structure to obtain differential equations, and the differential equations are calculated and park transformed. On this basis, the construction goal of the power system cooperative control model is proposed, and the power grid cooperative storage optimization element is considered to construct the power system cooperative control model. It is proved by simulation experiments that the research method in this paper has higher frequency deviation adjustment capability, can provide more stable power output capability, and has better promotion effect.
Nonlinear Numerical Analysis of The Plate Based on Thermo-Magneto-Mechanical Coupling
Authors: Bian Yuhong , You Qun
Published: December 2020

The thermo-magneto-elastic problems of the thin rectangular plate under the interaction of mechanical field, temperature field, and electromagnetic field are studied. On the basis of the geometric equations, physical equations, kinetic equations, and electrodynamics equations of the plate, the thermo-magneto-elastic basic equations of a thin rectangular plate are developed. According to Joule’s heat effect in the electromagnetic field and thermal equilibrium equation, temperature field in the thin rectangular plate, integral eigenvalues are derived. Adopting the difference, the quasi-linearization methods, quasilinear differential equations are obtained. Change rules of the stresses, temperatures, and deformations in the thin rectangular plate with electromagnetic parameters are analysed. It is confirmed that the stresses, strains, and temperatures in the plates can be dominated by altering electromagnetic and mechanical parameters through an example calculation.
Research on evaluation model of equipment research project procurement based on structural equation
Authors: Miao Xinyu , Cheng Zhonghua , Gao Tielu , Yue Shuai
Published: December 2020

This paper analyzes the problem that the variables that may be encountered in the procurement process of equipment research projects are difficult to measure directly and accurately. A bid evaluation model based on structural equation with 30 evaluation indexes is established, and a set of bid evaluation methods more suitable for equipment scientific research projects is proposed. Through the combination of factor analysis, path simulation test, multi group comparison and causality analysis of structural equation model, the data analysis and processing of the relationship between variables, indicators and variables are realized, and the continuous fitting test makes the model more accurate and effective.
Research and Simulation Analysis of Automobile Vibration System
Authors: Zhou Yang , Dong Mingming
Published: December 2020

Based on the analysis of the vehicle vibration system and considering the effects of the body’s roll, pitch and seat on the vibration, this paper establishes an 11-degree-of-freedom vibration model of the vehicle. Then, with the help of MATLAB/SIMULIK, the vertical vibration of the vehicle is simulated, which considers the asymmetry of the road surface excitation and the lag effect of the rear wheel input. After optimizing the suspension parameters, this paper compares the seat acceleration and the dynamic deflection of the suspension before and after optimization. The results show that the model established in this paper has a certain effect on improving the riding comfort of the vehicle.
Detection of Cracks on Mobile Screen Based on Computer Vision
Authors: Tian Haofei
Published: December 2020

In this study, a computer vision-based identification system is established for the detection of cracks on mobile screen. By using a CCD (Charge Coupled Device) industrial camera, images of mobiles’ screen on the industrial assembly line are obtained. For each mobile, the CCD industrial camera is revolved from several different viewing angles during detection of the mobile to avoid that cracks cannot be detected from specific viewing angles. Then the obtained RGB model images are converted into HSI color format. According to the obtained hue and saturation values, this system could accurately and effectively identify both large and tiny cracks on mobile screen, which demonstrates the validity of the machine system. This system could help modern industry for fast and effective cracks detection on mobile screen.
Review of Permanent Magnet Lifting Technology
Authors: Ding Ning , Cui Shanfu , Liu Chao , Duan Jingsong , Jiang Shuna
Published: December 2020

Permanent magnet lifting technology refers to the knowledge of the process of magnetic material suction unloading and transfer through permanent magnet lifting device with strong magnetic material as magnetic field energy. Compared with the traditional electromagnetic lifting device, the permanent magnet lifting device attracts and lifts ferromagnetic objects through the magnetic force of strong magnetic permanent magnet materials without excitation current during the lifting operation. Therefore, the permanent magnet lifting device has the advantages of energy saving, reliable use, low cost and high weight absorption ratio. This paper introduces the development of permanent magnet lifting technology, including the working principle and design problems of permanent magnet lifting device. According to the different demagnetization methods, it can be divided into electromagnetic demagnetization type lifting permanent magnets and mechanical demagnetization type lifting permanent magnets. Finally, the prospect of permanent magnet lifting technology is prospected and suggestions for its development are put forward.
Design of Motion Control System for Fire Fighting Robot
Authors: Nie Fuxiang , Wei Hongmei , Li Feng , Jiang Jie
Published: December 2020

This paper introduces a kind of motion control system of fire fighting robot. The main framework of the action of fire fighting robot is wireless remote control, including the head action to control the motion direction of fire fighting robot water gun. The data of head motion is collected by MPU6050 gyroscope. The camera on the water gun feeds the image back to the operator’s VR glasses to realize the synchronization of vision. The water gun can realize the rotation of yaw angle and pitch angle, and the driving method adopts a stepping motor. The four way navigation key module controls the action of the water gun. The two axis rocker sensor module controls the working state of the robot’s driving motor, and the robot uses the track driving method. The control system can be applied to most of the fire fighting robots used by remote control.
Research on the Density of Magnetic Fluid and its Application in Mineral Separation
Authors: Hao Ruican , Liu Huagang , Wang Shang
Published: December 2020

The density of magnetic fluid is important for some applications such as mineral processing. Magnetic fluid is a nano-sized magnetic material which has superparamagnetism. The density of magnetic fluid with no magnetic field was introduced. The measuring method was studied and the calculating formula was deduced. Since magnetic fluid could be magnetized, it could be controlled by magnetic field. The density of magnetic fluid could be changed by magnetic field. The buoyancy of magnetic fluid in magnetic field was researched and it was concluded that the buoyancy force of magnetic fluid in magnetic field is related to the mass, the volume, the permeability, the magnetization of magnetic fluid and the gradient of magnetic field. For a certain magnetic fluid, the parameters of itself are fixed. Then the gradient of magnetic field is the mainly factor influencing the magnetic force. A density measuring method for magnetic fluid in magnetic field was introduced. A mineral separation device based on magnetic fluid was introduced. And the principle of the mineral separation device with magnetic fluid was studied. More kinds of magnetic fluid and applications could be explored by researching magnetic fluid.
Failure analysis of a water wall tube
Authors: Ren Facai , Xu Jinsha , Si Jun
Published: December 2020

The failure reasons of a boiler water wall tube used in coal-fired power plant were analyzed by the chemical composition, optical microscope and scanning electron microscope analysis. The results of metallographic analysis show that the microstructure is ferrite and pearlite, pearlite has no obvious spheroidization. The comprehensive analysis results show that the abnormal oxidation erosion leads to the leakage failure of the water wall tube at the fire-facing side.
Corrosion Behavior of C4 Coating Produced by Cladding Laser in Sulfuric Acid
Authors: Ma Jiale , Liu Zongde
Published: December 2020

C4 coating was prepared by high power multilayer laser cladding. Corrosion behavior of the C4 coating and 316 stainless steel in sulfuric acid solution was investigated. The corrosion rate was measured by using the mass loss method. Obvious corrosion morphology and serious exfoliation corrosion of 316 stainless steel are noticed in sulfuric acid solution. While C4 coating after corrosion test shows nearly unchanged surface morphology. The results show that corrosion resistance of C4 coatings is higher than 316 stainless steel. The corrosion morphology was observed by SEM(Scanning Electron Microscope), and the elements distribution of corrosion products was analyzed by EDS(Energy-Dispersive X-ray Spectroscopy).The results show that the S element content increased with the extension of corrosion time, while the Cr content decreased. For the 316 stainless steel, with the extension of corrosion time, the content of C increased. The sulfur-containing corrosion products on the surface are all dissolved in the acid solution. The contents of Cr and Ni decreased, and their passivation ability was weakened. The results indicate that C4 coating exhibits better corrosion resistance in sulfuric acid solution due to the stable formation of dense oxide film on the surface.
Characteristics Study on in-situ NbC Particles Reinforced Ni-based Alloy Composite Coating by Laser Cladding
Authors: Xiao Yi , Liu Zongde
Published: December 2020

The in-situ synthesized NbC particles reinforced Ni-based alloy composite coating was successfully fabricated by laser cladding a precursor mixture with a mass percentage of 80%Ni-based alloy powder (Nb10 powder) and 20% Cr3C2 powder on Q235 steel substrate. Another composite coating was also produced by laser cladding using 100% Ni-based alloy powder as cladding material for comparison. X-ray diffraction (XRD), scanning electron microscopy(SEM), energy spectrum analysis(EDS), microhardness measurement and wear resistance test were performed on the cladding coating. The results show that Ni-based alloy composite cladding coatings are homogeneous and free from cracks, the cladding coating and the substrate exhibit excellent metallurgical bonding. The main phases of the composite coating were (Fe,Ni) solid solution, NbC and Cr23C6 reinforced phases. Abundant NbC particles can be uniformly formed via in-situ reaction between niobium and Cr3C2 in the molten pool during the laser cladding process, and they are commonly precipitated in three kinds of morphologies: granular, quadrilateral and petaloid shape. However, the comparative coating was only composed of (Fe,Ni) solid solution, without the formation of any carbides. The microhardness and wear resistance of composite coating of NbC particle reinforced composite cladding coating were improved significantly, the results indicate that the existence of NbC particles plays a crucial role in enhancing the performance of the cladding coating.
Effect of Coal Gangue Grain Size on Strength of Foam Concrete
Authors: Ni Kun , Shi Yunxing , Hu Zhihua , Zhang Yangang , Wan Pengcheng
Published: December 2020

This work shows that the grain size of coal gangue has affects on the strength of foam concrete with coal gangue. Coal gangue was crushed and separated into three grades sand according to the size which were 0.16-0.6mm, 0.6-2.5mm and 2.5-5mm. Then these coal gangue sand was used to manufacture foam concrete with a density of about 850kg/m3. The compressive, flexural strength, water absorption and softening coefficient of coal gangue foam concrete were tested. The results show that compressive strength of foam concrete exhibits a monotonic decreasing while coal gangue content increases and the decreasing rate would accelerate with the increasing of grain size. And the water absorption increased with the coal gangue content and grain size increasing. Small size coal gangue could improve the water absorption resistance. The coal gangue foam concrete is a water-resistant material and the softening coefficient is above 00.85, when the diameter of coal gangue fine aggregate is below 2.5 mm.
Principle and protective measures of high temperature corrosion of garbage incineration boiler
Authors: Wang Wei , Liu Zongde
Published: December 2020

With the increasing amount of garbage, the environmental pressure is increasing. Waste incineration power generation technology has become the main way to deal with waste. However, due to the complex and variable composition of waste and the large amount of chlorine contained in the waste, the high temperature corrosion of the heating surface of the waste boiler is much more serious than that of the coal-fired boiler. This article sorts out the high-temperature corrosion mechanism of the heating surface of the waste incineration boiler, and summarizes the relevant protective measures.
Experimental Study On Preparation Of C30 Concrete By Replacing Fine Aggregate With Molybdenum Tailing Slag
Authors: Miao Donghui , Guo Yuanqiang , Zhang Geng , Wang Xin , Jin Jia Qi
Published: December 2020

Which is composed of crystalline silica, a small amount of mica and molybdenum ore salts, and is non-radioactive. As a fine aggregate of concrete, the water demand of fresh concrete will be increased. By increasing the dosage of water-reducing agent, the construction performance of concrete mixture can reach the actual pumping concrete slump-flow (500±30) mm under the condition of unchanged water demand, and the same construction performance as that of mechanical sand concrete can be obtained. With the gradual increase of the replacement ratio, the compressive strength gradually decreases. When the replacement ratio does not exceed 40%, the 90d compressive strength decreases less than 3.1% compared with the mechanical sand concrete, which has less impact on the strength and can fully meet the requirements of the mechanical properties of C30 concrete.
Defects Dominated Regulation of Fluorescence Properties of Copper Nanoclusters
Authors: Ai Lin , Meng Hong
Published: December 2020

At present, many studies have suggested that during the luminescence process of Cu nanoclusters, the increase of metal defects can further enhance the emission, but the lack of understanding of the defect luminescence principle makes it tough to further adjust the emissions of luminescence and achieve multicolor luminescence. Herein, the 2D assembled sheet materials are modified with surface or deep defects. Metal defects affect the luminous energy level by regulating the optical properties of 2D assembled materials and regulating the detailed progress of exciton radiation action. Further more, research shows that continuous adjustment of the emission color can be achieved by only regulating the ingredient of surface defects and deep metal defects, and such surface metal defects have a lighter level and multiple sub-levels, which broadens the luminescent color. Finally, white light emitting diodes (WLEDs) with warm, cool and pure white color temperatures were achieved for illuminating applications used the full-color luminescence of Cu clusters.
Compression property of hierarchical pyramid lattice
Authors: Tao Liu , Zhu Guodong , Na Yang , Wang Jianfeng
Published: December 2020

Hierarchical design can not only effectively improve the mechanical properties of lattice structure, but also enhance the multi-functional design ability of lattice structure. Based on pyramid lattice structure, a novel hierarchical pyramid lattice structure was designed to enhance the energy absorption property. The finite element method (FEM) was carried out to explore mechanical behaviors of the hierarchical pyramidal lattice structure. The simulation results showed that the new lattice structure can improve the bearing capacity of the structure, and has a good specific energy absorption capacity. In addition, it can effectively reduce the stress concentration and improve the strength of the structure.
Research progress on hydrolytic stability of polyester polyurethane dispersions
Authors: Li Xi-Lan , Guo Xiu-Fen , Song Jia-Long , Sun Guag-Yan
Published: December 2020

This review summarizes the progress made by polyester polyurethane dispersions at home and abroad, focusing on improving their storage stability and coating film resistance to hydrolysis in the past ten years, and proposes suggestions for their research directions.
Analysis of Gas Supply & Demand in China and Suggestions for China’s Gas Industry Development
Authors: Yuanqi She , Yang Gao , Mingpeng Li , Shen Yang
Published: December 2020

The global natural gas markets are undergoing profound changes, with the supply and demand patterns in a historical transformation; the market supply and demand keep loose – both the gas traders and trade volume are increasing, the links between regional gas markets are enhanced, the gas pricing and trading mechanisms are diversified, the LNG trade share keeps growing, and the links between regional LNG markets are also strengthened. Influenced by the supply side reform and the accelerated urbanization, among other factors, gas consumption in China is increasing rapidly. However, the consumption of natural gas changes significantly from region to region, affected by the mismatch in gas production and consumption locations, as well as the gas import patterns. With the continuous energy restructuring in China, the gas consumption in different sectors is growing at very different paces. Analysis of the current situation, future trend and characteristics of China’s gas industry indicates that it is in the third stage of fast growth. Natural gas will play an even more important role in the future energy structure. With the continuous growth of gas consumption at home, the existing and expected gas deliverability is still faced with the risk of enlarging shortage in the mid-long term. In consideration of such circumstance, it is suggested that top-level design be strengthened on the national strategic level to seek rational, robust and scale development of the China’s gas industry. Internationally, diversified import channels should be sought to dilute supply risks, cooperation with the Asia-Pacific markets should be enhanced, and establishment of an international gas trading centre should be accelerated. Domestically, construction of a national gas interconnection system and a number of gas hubs should be speeded up, to make the gas industry an important component of the national energy network; the gas pricing mechanism should be established and completed as soon as possible to facilitate scientific allocation of profits and costs for gas production, storage and distribution, and to ultimately promote the sustainable and scale development of the whole chain of China’s gas industry.
Construction of Dye Sensitized Solar Cell with an Ethanol Based Anthocyanin Extraction of Grape Skin as Its Light Absorbing Material
Authors: See S C , Mercado M M , Corpuz J Z , Balbin J , Chua E
Published: December 2020

As the use of renewable energy resources such as solar energy still leads to the augmentation of energy supply insufficiency, this study aimed to provide an alternative source of economical, time-efficient and environment-friendly solar cell as a powerful potential energy source using grape skin Dye-Sensitized Solar Cell. The experimental parameter was the concentration of anthocyanin. The anthocyanin was extracted by boiling the dried grape skin in the ethanol solution. The semiconductor paste was prepared by mixing Titanium Dioxide and very dilute Acetic Acid (0.1 mL acetic acid in 50 mL water), and was coated on the conductive side of the conductive glass through screen printing method. The Construction of DSSC was done layer by layer. It consisted of working electrode (TiO2 semiconductor-dye) and counter electrode with carbon applied on it. The construction time for the 5 dye-sensitized solar cells was approximately less than an hour. The measured voltages were 0.43V, 0.40V, 0.40V, 0.45V, and 0.41V respectively, while the measured short-circuit currents were: 41µA, 38µA, 35µA, 41µA, and 39µA respectively.
Study on Heat and Mass Transfer Performance of Cathode Membrane Humidifier in Fuel Cell System
Authors: Xingsheng Lao , Yong Liu , Chunhui Dai , Jun Wu , Zhenxing Zhao
Published: December 2020

The experimental study on the heat and mass transfer performance of membrane humidifier in high-power atmospheric fuel cell system cathode side was carried out, and the main factors affecting the performance of membrane humidifier were determined. The mathematical model of heat and mass transfer of membrane humidifier was established to study these factors. Mechanism of influence on membrane humidifier performance is studied with a humidifier heat and mass transfer model. Results show that reducing the operating pressure of the humidifier, increasing the air flow rate, and increasing the intake air temperature are beneficial to increase the diffusion coefficient; reducing the air flow rate and lowering the dry air inlet temperature are beneficial to reducing the water content gradient in the membrane.
Economic Feasibility Evaluation of Simultaneous Electricity Generation and Leachate Treatment with Single-Chamber Microbial Fuel Cell
Authors: Sawasdee V
Published: December 2020

Bio-electrochemical technology in form of single chamber microbial fuel cell was used to simultaneous reduce organic pollutants and electricity generation under anoxic condition. Reactor was fixed working volume 1liters. Single chamber microbial fuel cell was started with open circuit that inoculates to biofilm on anode chamber and microorganisms can be adjusted to single chamber microbial fuel cell condition. Close circuit was started with 1,000 ω. Initial COD was converted to 5,109 mg L−1 that obtained current density per area 154 mA m−2, maximum power density per area 152 mW m−2 and COD removal efficiency was 70%, respectively. Moreover, the economic feasibility was evaluated in term of net present value (NPV) was 1,746.20, payback period (PBP) was obtained 1 year 4 months, respectively. Therefore, single chamber microbial fuel cell is technology that suitable for simultaneous reduce organic pollutants and electricity generation.
Multi-energy Complementary System for Joint Production of Liquid Fuel and Power
Authors: Zhang F , Zhu L , Wu P , Sun L , Wang Y
Published: December 2020

By taking the energy complementation as an idea and the steam methane reforming as well as coal partial gasification and Fischer-Tropsch synthesis as the core technological means, this paper establishes a coal and methane to co-produce liquid fuels and power generation system using an ASPEN PLUS simulator, and realizes that the H2/CO can be adjusted by directly changing the charging rate of raw materials with no need for additional equipment. At the same time, the coal char that has not yet been gasified is burned to provide the needed heat for the reaction of steam methane reforming, which can not only solve the demand of high heat of steam methane reforming, but also realize the gradient utilization of energy, thus reducing the loss in energy. In addition, some Fischer-Tropsch steam is used to generate power to further reduce the energy damage of the system. Two key parameters, namely coal input and Fischer-Tropsch recycle ratio, are discussed and their effects on system performances are analysed. At the optimum condition, the energy efficiency of this novel system reaches 52.5%, and the primary energy saving ratio reaches 30.4%.
Investigating the Effects of Boil-off Gas on Liquefied Energy Carriers During Land Storage and Ocean Transportation
Authors: Al-Breiki Mohammed , Bicer Yusuf
Published: December 2020

As the largest energy production suppliers are in different locations of the world and the demand for energy increases significantly, storage and transportation of large-scale energy with high storage and transportation efficiencies are desired. Large-scale energy is stored and shipped in liquefied forms due to reduction in volume however storage medium in a liquid form with low boiling temperature loses some of its energy because of evaporation, called boil-off gas (BOG), which is caused by a change in temperature between the storage medium and the ambient. Therefore, this study presents sensitivity analysis for three types of energy carriers: liquefied natural gas (LNG), dimethyl-ether (DME), and methanol to store and transport energy in liquid form from an exporting country to an importing country. A calculation method is used to determine the daily BOG rates accounting for storage and transporting for the three liquefied energy carriers. A sensitivity analysis is presented to reveal the effects of changes in duration of land storage and ocean transportation on the total stored and transported masses. LNG has lost 7% of its mass as BOG after 60 day of shipping and this lost percentage is the highest compared to DME and methanol. Due to low mass loses during storage and transportation phases, methanol and DME are potential alternatives for storage and transportation of large energy quantities.
The Potential of Improving Air Quality by Urban Mobility Management: Policy Guidelines and a Case Study
Authors: Badach Joanna
Published: December 2020

There is a growing recognition among planners and policy makers that proper transformation of urban mobility systems is crucial to the reduction of air pollution emission. The main objective of the work was to review the current urban mobility strategies in the city of Gdańsk, Poland in terms of their potential for the improvement of urban air quality. Firstly, general policy guidelines for mobility systems were formulated based on a review of recent relevant studies and existing solutions from various European and Asian cities. Then the main spatial characteristics of the transport system and mobility patterns in Gdańsk were determined and visualised by means of GIS-based tools, supported by the analysis of local urban and environmental planning documents. The current air quality status in Gdańsk was also described. Subsequently, the policies proposed in two documents for the urban mobility management in Gdańsk were identified and cross-compared with the previously reviewed solutions from other cities in terms of air quality improvement. The results showed that the strategies for air pollution mitigation are not integrated with the process of urban planning in Gdańsk to a sufficient degree. Finally, some recommendations were also suggested to improve the current strategies.
Dynamic Optimal Strategies for Multiple Pollutants in Transboundary Pollution Game between Two Asymmetric Regions
Authors: Ling Xingyuan , Meng Weidong , Huang Bo , Wang Chunyang , Li Yuyu
Published: December 2020

Under the fact that there are multiple pollutants, non-cumulative and cumulative pollutants, generated by two adjacent asymmetric regions, which result in transboundary pollution, we proposed a dynamic transboundary pollution treatment model to study how two adjacent asymmetric regions make their pollution treatment strategies under their self-interested behaviors while the pollution of both regions are treated optimally. The optimal investment policies under non-cooperation and cooperation are obtained through theoretic analysis. It is found that only when local governments cooperate to treat transboundary pollution, the damages caused by non-cumulative pollutants to adjacent regions will be taken into their consideration. The capital stock of pollution treatment investment of each region under the non-cooperative treatment is equal to that under the cooperative treatment.