bluuebunny/crossref_metadata_2025_split huggingface dataset:
A Study on Physical and Chemical Properties of Detonation Nanodiamond
Authors: Xie Shengzhong , Ma Lingzhi , Zeng Weiping , Gao Peng , Liu Xuezhang 
Published: February 2020

Abstract
Using analysis test methods, such as x-ray diffraction (XRD), x-ray photoelectron spectroscopy (XPS) and Fourier infrared spectrum (FTIR), x-ray small angle scattering (SAXS), optical correlation spectroscopy (PCS), scanning electron microscopy (SEM) and so on, the researchers systematically studied the detonation nanodiamond (DND)’s physical and chemical properties like crystal structures, surface chemical compositions, surface electrical property and particle size distribution, particle morphology and agglomeration state, etc. The results showed that the crystal structures did not be changed before or after DND disaggregation and dispersion, but the surface chemical compositions, surface electrical property, particle size distribution, particle morphology and agglomeration state all were changed obviously. The systematic data of physical and chemical properties of DND were obtained through the study in this paper, which could provide theoretical basis and technical reference for the application research of DND based on relevant technologies.
Preparation of TiC based Cermet with Different Ratio of Cu and Al
Authors: Wang Nengwei , Wan Shuquan 
Published: February 2020

Abstract
TiC based cermet belongs to superhard tool material, which has high melting point, high hardness and excellent chemical stability. It is the preferred material for cutting tools and wear-resistant components. At the same time, it has excellent conductivity and is also the preferred material for electrode. In this experiment, TiC based cermet was prepared by atmosphere protection sintering method with TiC, Cu and Al as raw materials. The phase analysis was carried out by X-ray diffractometer(XRD), the microstructure was observed by scanning electron microscope (SEM), the element analysis was carried out by energy spectrometer, and the bending strength was tested by universal material tester. The different sintering temperature and the ratio of additive Cu and Al were systematically studied under the premise of controlling the total mass of TiC based cermet, which effect on microstructure and mechanical properties of TiC based cermet. The experimental results show that the bending strength of cermet increases obviously with the increase of copper content in a certain range, and the best mechanical properties of cermet are obtained when the ratio of Cu and Al is 6:4. With the increase of sintering temperature, the mechanical properties of TiC based cermet are significantly strengthened. When the sintering temperature reaches 1100 °C, the grain size is fine and uniform, and the comprehensive properties of the material are the best.
Development of a Stable Carbon Isotopes Analysis Instrument Based on Tunable Diode Laser Absorption Spectroscopy
Authors: Cui Xiaojuan , Zhang Zhirong , Pang Tao , Xia Hua , Sun Pengshuai , Wu Bian , Yu Runqing 
Published: February 2020

Abstract
A compact laser spectrometry instrument was developed for high precision measurements of isotope ratio of CO2 by tunable diode laser absorption spectroscopy in the mid-infrared at 2.7 μm. The experimental spectrum of carbon isotopologues in the gas phase near 3641 cm−1 is very suitable for real-time analysis of these isotopologues. Simultaneous measurements of the mixing ratio and the corresponding δ13C values of CO2 in the atmosphere were performed. The achieved standard deviation (1σ) of δ13C was 1.8‰. The Allan analysis of the time series of the mixing ratio of CO2 shows a measurement precision of 0.2‰ for δ13C with an optimum integration time of about 130 s. The spectrometer is capable of real-time measurements of stable carbon isotope ratios of CO2 under ambient conditions.
A Genetic Algorithm for Economic Order Quantity with a Short Product Life Cycle
Authors: Ouyang Bing Chang 
Published: February 2020

Abstract
Considering a finite time horizon crossing over multiple stages of a product life cycle, this study presents a genetic algorithm to deal with an economic order quantity model with multiple demand rates under a non-periodic policy. In real, the demand of the product life cycle is a non-linear function but we assumes it as four-segment linear or constant approximations in this work. In addition, a multiple-segment to be combined with linear or constant functions can be approximated a nonlinear function. This study does not focus on this, but it provides a genetic algorithm to deal with this proposed inventory problems. The particular of this research is that we develop a proposed replenishment scheme by the differentiating equation of the total cost with respect to replenishment time. Then, calculate the total cost of the proposed scheme as the fitness function to evaluate the populations. In this paper, an explicit procedure to obtain an approximating solution is provided and numerical examples to illustrate the proposed model are shown as well.
Research on Damping Characteristics of Photo-controlled Electrorheological Damper
Authors: Liu Xiang , Chen Yusong , Wang Xinjie 
Published: February 2020

Abstract
Firstly, the expression of PLZT ceramic driving voltage is obtained with external load. Furthermore, the hydrodynamic modelling of the electrorheological fluid in the circular damping channel is carried out, and the relationship between the pressure difference between the two ends of the damping channel and the PLZT ceramic driving voltage is derived, and the hydrodynamic simulation of the electrorheological fluid in the circular damping channel was carried out in the fluid simulation software Fluent. The simulation result shows the correctness of the mathematic model and the feasibility of photo-controlled electrorheological damper.
The Study of Microstructure and Mechanical Properties of Two High Strength Steels
Authors: Li Shihan , Wang Xiaolin , Zhao Wei , Li Zunzhao 
Published: February 2020

Abstract
The microstructure and mechanical properties of two high strength steels with different carbon content were studied by means of metallographic microscope, scanning electron microscope, transmission electron microscope and mechanical testing machine. The results showed that the microstructure of the 0.2C (wt.%) steel and 0.4C (wt.%) steel was tempered sorbite, a large number of granular carbides dispersed on the ferritic matrix. The carbides contained Fe3C and M6C (Fe3Mo3C) phase. Compared with 0.2C steel, the content of the carbides of 0.4C steel was larger, while the particle size was smaller. The tensile and yield strength of 0.4C steel were higher, but the elongation was lower and the toughness was worse. In addition, the hardness values of the two materials were basically the same.
Friction and Wear Mechanism of High Temperature Brake Friction Materials
Authors: Han Junjiao , Qiu Qian , Ning Keyan , Han Ming , Zhang Nan , Lang Chaoyang , Liu Zhe , Ji Zhen , Jia Chengchang 
Published: February 2020

Abstract
In this paper, the microstructure and frictional wear mechanism of iron based high temperature brake friction materials prepared by powder metallurgy are studied. The results show that iron based friction materials are mainly composed of iron matrix, graphite and hard phase. Under the working condition of rotating speed of 6000r/min, the frictional wear mechanism is mainly abrasive wear and slight oxidative wear. Under the working condition of rotating speed of 8800r/min, the frictional wear mechanism is mainly abrasive wear, adhesive wear and oxidative wear.
Research on Cumulative Damage Evaluation Method for Structural Impact on Airborne Armored Vehicle in Landing Process
Authors: Fu Xinhua , Lu Yong , Wang Jun , Chen Xueyang 
Published: February 2020

Abstract
Since it was very costly and complicated to analyze cumulative damage caused by structural impact on airborne armored vehicle in landing process using real equipment airdrop test, finite element method(FEM) was taken to build a finite element(FE) model of airborne armored vehicle and airbag system to simulate the landing impact process of airborne armored vehicle. In combination with Lemaitre Damage Model and the damage evolution law of materials, the cumulative damage caused by structural impact of vehicle was calculated. The cumulative damage of structure of airborne armored vehicle in multiple landing processes was assessed, results of which were expected to provide theoretical guidance for the operational use and maintenance of airborne armored vehicle.
Numerical Simulation of a Bionic Blade on Small-Scale Wind Turbine
Authors: Kung Kuang-Yuan , Chen Jun-Liang , Hsu Cheng-Hsing , Tsai Wei-Feng 
Published: February 2020

Abstract
This study presents the aerodynamic characteristics of a small-scale horizontal axis wind turbine (HAWT) with bionic blade contours. Taiwan incense cedar was chosen as imitations. On account of the contour of the winged disseminules and the ANSYS FLUENT 14, we designed the bionic blades to process the computations of aerodynamic characteristics of the bionic wind turbine blades. The aerodynamic characteristics and the wind/electricity power transform efficiency of the turbines were examined in a wind tunnel. The wind tunnel experimental outcomes showed that the wind/electricity transformation efficiency of the wind turbine setup could reach to 37%, and it is benefit environment and global energy management.
Research on Static Characteristics of Steel-Concrete Composite Beam Cable-Stayed Bridge during Construction
Authors: Yang Zeying , Qu Yongye , Qu Jianbo , Zhang Yalei , Qi Wenchao , Xie Xinnan 
Published: February 2020

Abstract
As the construction continues, the structural system and load of the cable-stayed bridge will change. At different construction stages, the forces and deformations of the structure will have their own characteristics. In this paper, in order to study the static characteristics of steel-concrete composite beam cable-stayed bridge during construction, the Jiqi Yellow River Highway Bridge is used as the engineering background, and the finite element modeling is carried out by midas. The main beam, cable tower and stay cable of the cable-stayed bridge are analyzed respectively. Among them, the static characteristics of steel and concrete bridge deck during construction are specially analyzed. In this way, it is ensured that all structures are in a safe state during the construction process, and then the construction.
Two-rotation Orthogonal Combination Design Optimizes the Process Parameters of Fresh-cut Rosa Green
Authors: Han Peixin , Feng Xiaoguang , Zhao Xin , Liu Huijun , Chen Xiangning 
Published: February 2020

Abstract
In order to improve product quality, extend the shelf life of fresh-cut Rosa green, and reduce the loss rate of processing and circulation, the secondary rotation-orthogonal composite design is used to optimize the process parameters of ready-to-eat fresh-cut Rosa green. The results showed that weight loss rate, conductivity, POD, Vc, total number of colonies, nitrite, and chromaticity value a were significantly correlated with storage time (p<0.01). Principal component analysis showed that the two principal components accounted for 96.215% of the contribution rate. Fresh cut Rosa green quality evaluation value comprehensive value Y = -0.371 Chromaticity value a - 0.373 Weight loss rate -0.357 Total number of colonies -0.005 POD + 0.374 Vc - 0.333 Relative conductivity - 0.269 Nitrite. The secondary disinfection sodium hypochlorite concentration, the ratio of O2 (v / v) and CO2 (v / v) and the storage temperature were studied to influence the comprehensive quality of fresh cut Rosa green during storage. The results showed that the optimal process parameters were: secondary disinfection sodium hypochlorite concentration was 31.43ppm, O2 concentration was 3.04%, CO2 concentration was 5.55%, and storage temperature was 3.68°C. Fresh cut Rosa green processed under the optimum process parameters can be stored for 15 days. This study has positive significance for the post-harvest processing of fresh cut Rosa green.
Positive Effect of Chaiqin Wendan Decoction on Anxiety and Depression Model Rats
Authors: Li Xiaobing , Li Xinmin , Cai Ruijuan , Qi Binbin , Li Yuzhu , Wang Tian , Liu Wen , Chen Wenyu , Chen Yan , Ma Mengge , Ren Shicheng , Liu Xiaomei , Liang Xuejiao , Wang Dexing , Shen Guangbin , Zhang Huxiao , Zhang Bing 
Published: February 2020

Abstract

Objectives: To investigate the effect of Chaiqin Wendan Decoction (CWD) and mechanisms for anxiety and depression-like behavior in rats. Methods: We divide SD male rats into four groups randomly (blank group, model group, diazepam group and Chinese medicine group). The anesity and depression model rats were induced by chronic unpredictable emotional stress. Chinese medicine group and diazepam group were given CWD and diazepam respectively. The model group and the blank group were given the same amount of normal saline per day. The general state of the rats was recorded, and an open field trial and operation of the Morris water maze test were performed.the concentration of 5-HT was measured. Results: Compared with the model group, the body weight, horizontal movement distance score, number of upright, and target quadrant percentage of the rats in the Chinese medicine group increased significantly (P <0.05), and the latency decreased significantly (p <0.05). The concentration of 5-HT in the Chinese medicine group and diazepam group was significantly decreased by ELISA kit (P<0.05).Conclusion:WD can significantly promote the learning and cognitive ability of rats with anxiety and depression. Its mechanism of action may be closely related to the ability of CWD to reduce 5-HT concentration.
Conventional Bridge Damage Identification Based on BP Neural Network
Authors: Yang Zeying , Zhang Yalei , Wang Yaping , Wang Ning , Cui Haina , Qu Yongye 
Published: February 2020

Abstract
Aiming at the problem of insensitivity of damage identification in conventional bridges, the application of BP neural network in long-span bridges is studied, and it is extended to the field of damage identification of conventional bridges. The finite element models of three-span continuous variable cross-section box girders under intact and damaged conditions are established by Midas civil, and the eigenvalues of bridges under different conditions are analyzed. It is found that in conventional bridges, the sensitivity to structural damage is: mode > vertical displacement > natural frequency. The parameterized natural frequencies and modes of structures are used as input of BP neural network, and the damage location and degree are used as output to train the neural network. Then, the damage location and degree are identified under different working conditions, and the results show that the recognition effect is not satisfactory. Analyzing the reason, the natural frequency and modal shape of the structure will change when the conventional bridge is damaged, but the deformation value is very small. When training the BP neural network, it is easy to appear over-fitting, which results in poor recognition effect. Therefore, it is difficult to identify structural damage by using BP neural network through acquiring the characteristics of conventional bridges. It is still necessary to study appropriate damage identification parameters and methods that can be applied to conventional bridges.
On Broadband Nonlinear Piezoelectric Energy Harvesting Techniques
Authors: Sun Chuahua , Shang Guangqing 
Published: February 2020

Abstract
With the development of portable electronic devices, internet of things, micro-electromechanical system (MEMS) and wireless sensor networks, mirco sources and self-powered devices have been attracted great attention. It is an effective way to supply mirco power or realize the miniaturization of the device via the piezoelectric energy harvesting effect. Therefore, research on piezoelectric energy harvesting techniques has been highly valued. To enhance adaptability and improve harvesting efficiency, the broadband nonlinear piezoelectric energy harvesting technique turns to be a research hotspot. The current status of broadband nonlinear piezoelectric energy harvesting technique with nonlinear stiffness was reviewed according to methods of realizing nonlinearity. The characteristics and existed problems of each kind of nonlinear harvester were then concluded. The nonlinear piezoelectric energy harvester with nonlinear stiffness has a good prospect if its advantages can be given full use.
Progress of Airborne Lidar of Ocean Chlorophyll Observations Including Algorithm and Instruments
Authors: Li Yongzhi , Yu Kun , Zhang Wenkai , Li Dan , Zhao Zheng , Jiang Xiao , Jin Dingjian , Shang Boxuan , Wang Houmao 
Published: February 2020

Abstract
Airborne lidar is widely used to measure water depth, organic matter, chlorophyll, seabed topography and seabed types et al. The water depth observation has been studied for many years by many scientists, while the Chlorophyll retrieval by airborne lidar is studied by a few scientists. In this paper, the progress of measurements of Chlorophyll by use of airborne lidar is discussed, which includes the progress of retrieval algorithm, international instruments, and Chinese instruments.
Analysis of Climate and Water Resources Characteristics in Chongqing
Authors: Chen Rong , Wang Jinglan , Zhang Weihua 
Published: February 2020

Abstract
Due to the impact of climate change, the spatial and temporal distribution of water resources has also changed accordingly. We want to know the response of Chongqing’s water resources to climate change. By using the methods of linear regression and cumulative anomaly, this paper analyses the meteorological data of Chongqing from 1951 to 2018 and the climatic and hydrological conditions in recent years. It is found that Chongqing is in a period of high temperature and rainy weather under the influence of global warming, and is very prone to drought and flood disasters. This study can show the climate and water resources changes in Chongqing in the future to some extent and help the local authority for designing and operating the hydrological sensitive facilities.
Construction of Air Pollution Monitoring and Pre-Warning Platform—Taking Daming County, Handan City, Hebei Province as an Example
Authors: Qian Huan , Yue Jianwei , Li Jingze , Ding Kesong 
Published: February 2020

Abstract
Based on GIS technology, computer hardware and software and network communication technology, an air pollution monitoring and pre-warning platform is constructed. It helps to monitoring air pollution situation in Daming county and analysis the data from monitoring sites about AQI, PM
2.5 and other five kinds of air quality index. By using this platform, people can intuitively find where is the main air pollution source and the air quality forecast around all county.
The Numerical Simulation of Gas-Liquid Two Phase Flow in Annular Gap Venturi of Converter Wet Dust Removal
Authors: Ye Mengmeng , Liang Mei , Qian Fuping , Lu Jinli 
Published: February 2020

Abstract
Based on the CFD-DPM method, the numerical simulation of gas-liquid two phase flow in annular gap venturi with different annular gap trip and liquid/gas ratio at the same gas flow rate was carried out in this paper. The results show that the pressure drop at the contraction section of venturi accounts for about 75% of the total pressure drop, and the pressure drop at the throat is about 20% of the total pressure drop. The average velocity of flue gas at the throat ranges from 106 to 192m/s. The total pressure drop of the venturi is proportional to the liquid/gas ratio at the constant annular gap trip, and the larger the annular gap trip, the greater the effect of the liquid/gas ratio on the pressure drop. As the annular gap trip is 800∼900mm, the effect of liquid/gas ratio on the pressure drop is significant. The total pressure drop of the venturi and the droplets concentration at the venturi inlet are proportional to the annular gap trip at the constant liquid/gas ratio, and the growth rate of the pressure drop is greater with the annular gap trip as the annular gap trip is larger than 700mm. In addition, the growth rate of the droplets concentration at the venturi outlet also increases with the annular gap trip.
Distribution Features of Phytoplankton and Its Correlation with Environmental Factors of Baima Lake
Authors: Wang Jun , Wu Sushu , Fan Bowen , Chen Wenmeng 
Published: February 2020

Abstract
In order to deal with the degradation of ecological function in Baima Lake, 11 Sampling sites were set up in 2014, 2016 and 2017 in Huaian City, Jiangsu Province. Sampling was conducted monthly to monitor and analyze the temporal and spatial changes of phytoplankton community structure in the lake. The results showed that 119 species of phytoplankton were identified in 2014, 109 species in 2016 and 114 species in 2017, belonging to 8 phyla. Phytoplankton abundance got top in summer and bottom in winter. Its spatial distribution was higher in northwest and central, and lower in northeast and south. The health status of lakes in different years was evaluated by Shannon-Wiener diversity index, Pielou evenness index and SI pollution index. Baima Lake is a medium-eutrophic (moderate) water body. Pearson correlation analysis was carried out between phytoplankton and environmental factors.
Study on Ecological Vulnerability of Dianchi Lake Basin Based on GIS-Based Principal Component Analysis
Authors: Ma Xiaoliang , Peng Shuangyun , Lin Cong , Lin Zhiqiang , Zhou Yanlian 
Published: February 2020

Abstract
Ecological vulnerability is one of the key concerns of global environmental change, sustainable development, and human-land relations. This paper takes the Dianchi Basin as a research area, uses GIS principal component analysis method, selects relevant index factors to determine the weight, and finally combine evaluation index model to comprehensively analyze the ecological vulnerability of the Dianchi Basin. After research, it is found that: ①The ecological vulnerability of the Dianchi Basin is relatively high as a whole, of which 69.72% of the ecological vulnerability grades are above Grade 3. ②The ecologically fragile areas in the Dianchi Basin are generally scattered and concentrated in a small area, and the closer to the area of Dianchi, the higher the vulnerability level. ③The ecological vulnerability of the Dianchi Basin is the result of multiple factors. The research has reference significance for the ecological construction and economic development of Dianchi Basin in the future.
Analysis of Disturbance Factors in Zhalong Wetland Landscape Dynamics
Authors: Yang Yuqing , Gong Adu , Zhang Yuhong , Chen Yanling , Zeng Tingting 
Published: February 2020

Abstract
Based on remote sensing image data and meteorological data, this paper analyzes dynamic landscape disturbance factors of zhalong wetland through landscape pattern index and other methods, the results show that: (1) In recent 40 years, zhalong wetland landscape type pattern space, landscape fragmentation phenomenon is more serious.(2) The total area of swamp continues to decrease, and the bare land and cultivated land also show a decreasing trend, but the grassland and water area increase.(3) The temperature fluctuation, precipitation change and the government’s policy of building railways and ditches have a profound impact on the landscape pattern of wetland.(4) At the early stage of the study, zhalong wetland landscape dynamic influencing factors are mainly natural factors such as temperature and precipitation;Since the 1990s, human activities such as government building of railways, highways, ditches and other factors have gradually increased the impact on wetland landscape dynamics.