bluuebunny/crossref_metadata_2025_split huggingface dataset:
Analysis of land carrying capacity of livestock and poultry breeding in China from the perspective of combination of planting and raising
Authors: Zhu Ning , Cao Bo , Qin Fu 
Published: November 2020

Abstract
The separation and imbalance of planting and raising are the key issues to be solved urgently in China’s agricultural development. In order to solve these problems, based on livestock manure nutrient supply and crop nutrient demand, this study uses the method released by the National Animal Husbandry Station to calculate and analyze the land carrying capacity of livestock and poultry breeding in China. The results indicate that, the supply of manure nitrogen from livestock and poultry was greater than that of phosphorus in 2017, there were large differences in the supply of livestock manure nitrogen and phosphorus from different livestock and poultry types and provinces, which was caused by the number of livestock and poultry in slaughtering, stock, breeding cycle, nutrient content of manure and the type in various provinces. The input of nitrogen and phosphorus in crops had exceeded the demand, which verified that it is feasible to reverse the problems of excessive fertilization and low utilization rate by reducing the amount of fertilization and replacing livestock manure with livestock manure. The index of land carrying capacity of livestock and poultry breeding in China was 0.48 and the number of livestock and poultry that could be carried was 5.921 billion pig equivalents, indicating that China’s land could absorb livestock and poultry manure. In order to promote the combination of breeding and farming and the green development of agriculture, it was proposed to carry out the action of replacing fertilizer with manure for livestock and poultry according to local conditions, formulate a reasonable breeding policy based on the carrying capacity of livestock and poultry and propose countermeasures for coordinated development of planting and breeding.
Research on the Index System of Freshwater Ecosystem Monitoring and Evaluation
Authors: Cao Zhen , Wang Zhenjie , Gao De , Liang Haijun 
Published: November 2020

Abstract
Freshwater ecosystem monitoring is a historical necessity for the development of water resources management. The meaning, service functions and influencing factors of the freshwater ecosystem are summarized, and the shortages of the monitoring and evaluation indicators related to the freshwater ecosystem are analyzed. In order to understand the current situation, changes and evolution trends of freshwater ecosystems, combined with the principles, theories and methods of monitoring and evaluation of freshwater ecosystems, from the different levels of species, populations, communities and ecosystems, structural indicators, functional indicators and stability indicators are proposed.
The bottom ash from municipal solid waste and sewage sludge co-pyrolysis technology: characteristics and performance in the cement mortar and concrete
Authors: Li Erping , Chen Haoyun , Huang Fenglian , Tian Shiqing , Yu Zhiyuan 
Published: November 2020

Abstract
To efficiently and environmentally treat the municipal solid waste (MSW), co-pyrolysis technology was further developed by adding high heat value substance of sewage sludge (SS). As the co-pyrolysis technology for MSW and SS has been popularly developed, the production of the bottom ash is constantly increased. The treatment and utilization of this part of bottom has become an urgent issue. This work investigated the basic characteristics of the co-pyrolysis bottom ash and evaluated the application possibility of the co-pyrolysis bottom ash as building materials. The co-pyrolysis bottom ash possessed high chemical contents of CaO + MgO/SiO2 + Al2O3 over 88 %. Excellent performance of comprehensive and flexural strength for cement mortar and concrete were realized with the co-pyrolysis bottom ash incorporated.
Reconstruction design of a turbine generator foundation
Authors: Li Ming , Hu Junjie , Zhou Zhiyong , Chen Mingxiang 
Published: November 2020

Abstract
The key to the reconstruction of turbine foundation is the dynamic performance control and the anti fatigue performance and durability of the new and old concrete interface. Based on the finite element analysis method, the natural vibration analysis of the steam turbine foundation before the reconstruction is carried out, and the calculation data of the natural vibration frequency and mode are compared with the field dynamic test data to verify the rationality of the finite element calculation model. On this basis, the natural vibration analysis and the harmonic response analysis of the reconstruction scheme are carried out, and the vibration line displacement of the key points of the disturbance force of the steam turbine foundation meets the vibration displacement control standard within the frequency range of 0 ∼ 62.5Hz. The static analysis is carried out for the transformation scheme, and the prestressed reinforcement is arranged to ensure the compression of the new and old interface; the project abandoned bonded rebars with limited service life and adopted self-locking anchors with the same life as the original structure to connect old and new concrete bonding surface. The low cycle fatigue test of self-locking bolt and concrete base material is carried out. The test results show that there is no fatigue failure, which shows that the reinforcement scheme can meet the requirements of fatigue resistance and durability.
Service quality evaluation of fresh agricultural products cold chain logistics based on principal component and neural network
Authors: Fu Mian , Wang Dandan 
Published: November 2020

Abstract
With the rapid development of fresh e-commerce, the cold chain logistics service quality of fresh agricultural products has attracted the attention of businesses and customers. Starting from the connotation of cold chain logistics service quality, the evaluation index system of agricultural products cold chain logistics service quality with 13 influencing factors was established. Considering that too many dimensions of input data and strong correlation among indexes will affect the training of neural network, this paper proposes to build a service quality evaluation model of cold chain logistics of fresh agricultural products by combining principal component analysis with BP neural network. Through the actual data verification of an e-commerce logistics enterprise, the evaluation accuracy rate is significantly improved, which provides an effective method for the service quality evaluation of fresh agricultural products cold chain logistics.
Study on energy flow test of electric vehicle based on four-wheel drive powertrain bench
Authors: Wei Zhang , Helin Zhang , Haotian Shi 
Published: November 2020

Abstract
In order to obtain the internal energy conversion, transmission and loss, namely the distribution law of energy flow, a test platform for the energy flow of electric vehicle was built. The test bench is mainly composed of four-wheel drive powertrain bench, automatic driving system, a data acquisition system, sensor measurement system, charging system. It can monitor the operation parameters of the whole electric vehicle under different working conditions. Energy flow distribution can be obtained by processing the measured operation parameters. The energy flow of an electric vehicle under CLTC condition was tested. The energy distribution and energy consumption of each component of the vehicle were obtained, which provided guidance for the optimization of each component of the electric vehicle.
Study on Precise Temperature Control Method of Hot-rolled Ribbed Bar during Cooling Process
Authors: Li Jie , He Chunyu , Zhao Xianming , Wu Zhiqiang 
Published: November 2020

Abstract
Aiming at the demand for performance control in the production process of hot-rolled ribbed bar, the finite difference method was used to establish a temperature prediction model during the cooling process. The calculation accuracy of the temperature model depends to a large extent on the selection of heat transfer coefficient. In this study, the industrial production data was cleaned and screened by the clustering algorithm to obtain training sample data, and based on BP neural networks, the mapping relationship between different influencing factors and heat transfer coefficient was established. According to the change of production conditions, the heat transfer coefficient is learned adaptively, which improves the prediction accuracy of the model. By comparing the predicted and actual temperature values over a period of time, the deviation between most predicted and actual values is less than 20°C, and the deviation is reduced by about 30°C compared with that before the BP network was used to study the heat transfer coefficient. Under the constraints of the target temperature and the temperature difference between the inside and outside of the section, the precise control of the cooling temperature of the hot-rolled ribbed bar is realized by the calculation of the temperature prediction model.
Optimization of Manufacturing Process and Experimental Verification of Vulnerable Part in Reactor
Authors: Bo Yang 
Published: November 2020

Abstract
The technical requirements of the control rod driving mechanism of the third generation PWR nuclear power plant are higher. The latch parts are designed with double tooth structure and welded on the wear-resistant surface by cobalt-based alloy surfacing. According to the structural characteristics and manufacturing process difficulties, a special welding device is developed. According to the test and finite element simulation, the related process parameters are optimized. The trial production of the parts was completed, and the parts were tested by metallography, liquid permeation test, hardness test and thermal life test. The results show that the latch parts have high hardness and wear resistance, and meet the requirements of the driving mechanism operation life of the third generation PWR nuclear power plant.
Resistance Analysis of Low Reynolds number flow in porous media
Authors: Kuncan Zheng , Chong Guan , Qiangjun Shi , Zhonggeng Yang , Zhaodong Chen 
Published: November 2020

Abstract
At present, some researchers believe that Darcy’s law may not be valid, which may be the root cause of complex porous media problems. Porous media flow model is generally regarded as pipe flow, but in theory, it is necessary to consider it as bypass flow. However, there are few studies in this area. According to the seepage characteristics, we established the model of flowing around a single sphere in porous media and derived the resistance correlation of Darcy velocity (Re < 1). However, the Darcy experimental data analysis shows that the predicted value of the flow around the sphere is far lower than the experimental value, which proves that the assumption of the model of flowing around a single sphere is unreasonable. Even for the seepage of the extremely low Reynolds number, the flow interference around the sphere should be taken into account. Therefore, when the interference coefficient is 45, our formulas are superior to the classical Kozeny-Carman equation and Ergun equation in the prediction of all Darcy’s experimental data and Charles Ritter’s experimental data. Ergun equation has the largest error.
Synthesis and Properties of a Debonded Polycarboxylic Acid Superplasticizer
Authors: Li Guangzhou , Xiong Qiumin , Chen Xiaobin , Guan Jican , Dang Wei 
Published: November 2020

Abstract
High-strength concrete has always had the problem of high viscosity which is not easy to construct, but reducing viscosity will inevitably affect the strength of concrete. In this paper, a kind of polycarboxylic acid series viscosity reducing agent JN-1 was synthesized by adjusting the synthetic raw material, which can reduce the viscosity and ensure the strength of high strength concrete for 28 days to reach or exceed 100%, Synthesis Key points are the use of acrylamide and the control side chain length.
Numerical Study on Heat Transfer Characteristics of Triangular Ribs with Different Inclination Angle in Rectangular Channel
Authors: Li-han Chen , Wei Peng , Yong-heng Zhang 
Published: November 2020

Abstract
The secondary flow in the ribbed channel is the main factor to enhance the heat transfer. In this article, FLUENT is used to study the influence of the secondary flow intensity of isosceles triangular ribs with different inclined angles on the heat transfer in the rectangular channel. Reynolds number Re=8000∼20000, the angle of inclined ribs varies from 30°to 90°, and the ratio of ribbed height to ribbed width remains unchanged, and the ratio of ribbed spacing to ribbed height is 6. The results are as follows: the Nu/Nu
0 of triangular ribs decreases with the increase of Re, and the f/f0
increases with the increase of Re. Setting ribs in the channel can produce obvious transverse secondary flow and longitudinal secondary flow. The secondary flow intensity increases with the increase of Re. With the increase of Re, the transverse and longitudinal secondary flow contribute to the heat transfer, and the longitudinal secondary flow contribute more.
Simulation and Design of Multistage Unlimited Packers in Horizontal Wells
Authors: Yang Liu , Jiang Ping , Zhang Guicai 
Published: November 2020

Abstract
The staged fracturing technology for horizontal wells has successfully promoted the development of unconventional oil and gas, but it faces the challenges of rapid production decline in oil and gas wells. Studies on the multistage unlimited fracturing technology, that is, the existing fracturing tools are redesigned, the fully bored wellbore can be modified, any number of stages can be designed, and the technical advantages such as maximizing reservoir reconstruction can be achieved. The conventional packers cannot achieve the multistage unlimited fracturing, the packers are redesigned in this study. Through the Solid works software, the single use pin is transformed into a one-way internal tooth and a locking mechanism of the card board. The structure can be hydraulically applied to the piston, and the piston drives the internal teeth of the sealing sleeve to perform locking and adduction, so as to achieve repeated setting and unsealing of the packer. By means of ANSYS software and finite element calculation method, it is verified that the designed packer meets the third strength theory and safety requirements.
Accurate Traceability of Key Auto Parts in China Automobile Factory
Authors: Zhou Maoxiang , Zhang Ting , Zhao Mingnan 
Published: November 2020

Abstract
Based on barcode specification and quality error prevention, the manufacturing plant controls traceability information of logistics distribution, automobile assembly and quality inspection, and realizes accurate traceability of key parts of the vehicle. This thesis discusses how to realize the KPC of key parts and the quality traceability of production and assembly process when quality defects occur in a company.
Optimization on the Topological Coupling-Throttling Structures for Directional Valves
Authors: Zhang Xiaolu , Wang Anlin , Chen Yuanliu , Jiang Tao 
Published: November 2020

Abstract
As for the coupling-throttling effect of multiple grooves and notches on directional spool valves in the process of reversing, A parameterized mathematic model of the coupling-throttling effect for directional valves is proposed in this paper, which uses three basic throttling topological structures (O-shaped, U-shaped and C-shaped) to consist the topological variable space. Specifically, firstly, a bench test was carried out to verify the validation of 3D CFD simulation of the directional valve (on flow and pressure characteristics), which shows a consistent result. Then, on the premise of above, a parametric model of the coupling-throttling effect of multiple grooves and notches on directional valves is established, which accuracy is also proved with CFD simulation; under the constraints of limited topological variables, a topological structure of the coupling grooves and notches is optimized. It can be found from the test results that, the proportional characteristics of the working port is obviously improved, indicating that the parameterized mathematic expression of the coupling-throttling effect can be referred to for the design of such coupling structures.
Preliminary study on rapid screening technology of small non-ferrous metal residues in explosive devices
Authors: Ao Gao , Jifeng Zhang , Wei Gao , Yuyou Sun , Liantie Wang , Yanhui Pan 
Published: November 2020

Abstract
The remnants of explosive devices contain copper, aluminium, tin and other non-ferrous metals, which often play a key role in the detection of explosive cases. Therefore, compared with the remnants of explosive devices made of plastic and other materials, the discovery and extraction of non-ferrous metals remains is particularly important in the field investigation of explosive cases, especially the small non-ferrous metal remains that are difficult to be found by the naked eyes. It is necessary to study new techniques and methods for the discovery and extraction of residues. In this study, the automatic screening technology of small non-ferrous metal residues in explosive devices is analysed. Through the comparative analysis of various separation and extraction technologies, it is believed that electromagnetic separation technology is expected to be used in the rapid screening of small non-ferrous metal residues in explosive devices.
Experimental study on characteristics of consolidation of sludge
Authors: Hong Siyuan , Chen Yao , Chen Xiaojun , Dai Wenan , Li Lei 
Published: November 2020

Abstract
Sludge dewatering has become an important issue in the sewage treatment industry. The essence of mechanical dewatering is the consolidation and drainage of sludge. Therefore, it is of great significance to study the consolidation characteristics of sludge to improve the dehydration efficiency. Consolidation tests were carried out on the sludge treated with FeCl3 and Fenton reagent, and the consolidation and permeability characteristics of the treated sludge were studied. The sludge shows ultra-high compressibility. The consolidation coefficient of the untreated sludge is 10−7∼10−6cm2/s. After adding 15% FeCl3 (relative to sludge dry weight), the consolidation coefficient of the sludge increased by 5∼8 times, and reached 10−6∼10−5cm2/s after Fenton reaction treatment. The untreated sludge has obvious time deformation characteristics.
Time-domain solution of Cole-Cole model with induced polarization method
Authors: Liu Ruize , Meng Qingxin 
Published: November 2020

Abstract
The spectral parameters of the Cole-Cole model can be used to distinguish the IP anomalies of different geological bodies. However, the frequency domain IP requires a lot of observation data and its efficiency in field work is low. In view of this reality which is very common to use the data of the time-domain IP. It is necessary to study the law of the time-domain solution of Cole-Cole model with induced polarization method. First of all, this paper transforms the complex resistivity in the frequency domain into the time-varying resistivity in the time domain through the inverse Laplace transform, then by changing different Cole-Cole parameters in the time domain so that we can observe the changing law of time-varying resistivity time-spectrum characteristics caused by different parameters.
Analysis on the development of ancient glass technology in the Central Plains of China in the pre Qin Period
Authors: Guo Yakun , Wu Tong 
Published: November 2020

Abstract
Glass is a “solid that cooled down after melting to maintain liquid structure”, commonly known as “supercooled liquid”. It belongs to amorphous amorphous material, which is different from gem, ceramics and other crystalline materials. Based on the analysis of the chemical composition data of PIXE, this paper studies the archaeological unearthed objects of different periods in the Central Plains area of pre Qin Dynasty, and compares them with the sample data of Western Asia and Egypt to analyze the development and origin of ancient glass technology in the Central Plains. The results show that the ancient glass in the Central Plains area of pre Qin China sprouted in the Shang Dynasty, based on the faience and frit in the spring and Autumn period of the Western Zhou Dynasty, really appeared at the end of the spring and Autumn period. According to the different auxiliary solvents, it can be divided into three categories: early alkali calcium silicate glass, lead barium glass and potassium silicate Asia, ancient Egypt and their influence on the development of ancient glass technology in the Central Plains during the pre Qin period. According to the different cosolvents, it can be divided into early alkali-calcium silicate glass and lead barium glass. The three categories of potassium silicate and potassium silicate demonstrate the original system and characteristics of ancient glass in the pre-Qin period, and analyze the influence of ancient West Asia, ancient Egypt and the development of ancient glass technology in the Central Plains in the pre-Qin period from the perspective of cultural exchanges between China and the West.
Developing activities of green design, green purchasing, and green transportation as the part of green supply chain management in construction sector
Authors: Setyaning L B , Wiguna I P A , Rachmawati F 
Published: November 2020

Abstract
Green Supply Chain Management (GSCM) is a concept that integrates environmental factors into the traditional SCM started from the process of design, material procurement, production, distribution and end-of life. The benefits of implementing GSCM does not only improve the company’s environmental performance, but also improve economic performance such as reducing operational costs and organizational performance such as improving the company’s image. In manufacture and automotive industry, GSCM is able to improve company performance, therefore construction industry can consider of adopting this approach. Some GSCM practices in construction sector include green design, green purchasing, green transportation, green construction, green warehousing, green recycling and facilitating green practices. The aim of this study is to identify relevant green design, green purchasing and green transportation practices as part of GSCM if applied in the construction sector. The research variables were obtained through a literature study on GSCM both in construction sector and other sectors, then the variables were validated by respondents, practitioners in construction sector. Based on three respondents, there are ten green design practices, six green purchasing practices and five green transportation practices that are relevant to the construction sector, especially building projects.