bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on residential differentiation in urban fringe areas from the perspective of spatial justice – A Case Study of Xi’an City
Authors: Yang Xiaojun , Li Xiuyuan , Kong Ziqi , Lei Lei 
Published: April 2020

Abstract
Residence is one of the four functions of the city. The spatial layout of the residential area affects the sustainable development of the city. With the rapid development of social economy and the continuous expansion of urban space, the living space structure in the marginal area of Xi’an has been adjusted, and the living space differentiation has become increasingly obvious. Based on the theory of space justice and using the methods of space analysis, statistical analysis and field research, this paper concludes that the core of living space in the edge area of Xi’an lies in the city center, and the future development direction is northeast and southwest. The characteristics of housing price are that the middle price of residential area is the most and the number of high-end and low-end residential area is relatively small. The housing types are divided into four categories: high, high-medium, medium and low. The marginalization of residential areas is high, the middle and high-end residential areas are multi-centralized, and the middle and low-priced residential areas are marginalized, and the degree of regional differentiation is gradually deepening. This is an important feature of the differentiation of residential areas in the marginal areas. Finally, the fairness of the living space structure in the social area was evaluated, and corresponding optimization suggestions were put forward.
Research on the Spatial Integration of Traditional Villages under the Concept of “Live Heritage”—Taking Chang’an district of Xi’an as an example
Authors: Yang Xiaojun , Shi Tingli , Li Xiuyuan , Kong Ziqi 
Published: April 2020

Abstract
The protection and sustainable development of traditional villages is an important issue of common concern in all walks of life. Taking the Yaotou Village of Weinan City in Shanxi Province as an example, this paper simulates the spatial and temporal evolution process of the Sansheng space in Yaotou Village through questionnaire interview and GIS spatial analysis method. For the revitalization of the handicraft village provides a reference.
Study on the Rural Revitalization Path in the Continuum Depressed Area from the Perspective of Inclusive Green Development: A case study of Qinba Mountain Area
Authors: Yang Xiaojun , Liu Qin , Cao Qun , Lei Lei 
Published: April 2020

Abstract
Implementing the rural revitalization strategy is the action plan for rural construction and development in the new era, and it is the general requirement and general grasp of the work of “agriculture, rural areas and farmers “. Based on the four-dimensional relationship between resource development, poverty alleviation, community participation and ecological protection, this paper analyzes the poverty situation, causes and development characteristics of Ankang in Qinba mountain area. The study found that Ankang City in Qinba Mountain Area has many poor people and a deep poverty. It faced the dual pressures of protecting the ecological environment and fighting poverty. From the niche point of view, Ankang City is located in ecologically fragile areas and ecological diversity protection areas, and from the perspective of economic development, it is a contiguous destitute area with deep poverty. Therefore, rural revitalization in the region must weigh these relationships and issues. From the perspective of inclusive green development, it proposes a rural revitalization path suitable for the region, adheres to precise poverty alleviation, promotes equalization of opportunities for the poor to participate in rural development, increases the rights of the poor in the system, and protects the ecological environment. To provides a theoretical reference for scientific formulation of rural revitalization strategic planning and early realization of rural revitalization.
Inverse geochemical modelling of pit lake waters in the Zeida abandoned mine (Morocco)
Authors: El Alaoui L , Dekayir A , Rouai M 
Published: April 2020

Abstract
In the high Moulouya watershed, the exploitation of the Zeida mine between 1972 and 1985 generated huge masses (millions of tons) of mining waste (Pb, Zn). This activity created large pits currently filled with stagnant water which are in permanent contact with remaining ore deposit.
The interaction of rainwater with rocks and minerals lead to the enrichment of Water Lake with heavy metals.
An inverse geochemical modelling carried out on water sampled in ZA and ZL1 lakes made it possible to highlight the chemical reactions occurring between rainwater and ore deposit and which would control the chemistry of these waters.
Thermophysical characterization of a new clay-based construction material from the Atlas region
Authors: Lkouen A. , Meskini A. , Lamrani M. , Khabbazi A. 
Published: April 2020

Abstract
As part of the valorization of local materials and the search for energy efficiency in the building sector, a thermophysical study was carried out on a new clay-based composite material from the Atlas region reinforced by peanut shells, which constitute an abundant ecological and untapped waste. In this study, a series of samples (100×100×26 mm3) of this composite are elaborated at different mass fractions of peanut shells. The thermal parameters are estimated by metrological methods such as the steady-state hot plane method and the flash method. The results showed, in addition to the lightness offered by peanut shells to these composites, that the thermal conductivity and thermal diffusivity vary respectively from values 0.623 W.m−1.K−1 and 4.8 m2.s−1 for raw clay to the values 0.323 W.m−1.K−1 and 3.5 m2.s−1 for the mass fraction of peanut shells to ϖ = 9%, which give this material the quality of the insulating walls.
Sorption of contaminants into thermoplastic pipes: A Critical Review
Authors: Elamine L. , Elmaliki A. , Majid F. 
Published: April 2020

Abstract
For several decades, polymeric materials are increasingly used in various fields, particularly in the distribution of drinking water thanks to the various advantages represented by polymers such as light weight, low cost, easier to install and without any problem of corrosion compared to metal pipes. One of the main concerns of researchers is the sorption of the constituents of drinking water through the pipe. Many studies have found that the mass transfer of a liquid into the polymer has consequences such as the change of crystallinity, the yellowing of the polymer, decrease of mechanical resistance and the swelling of the polymer. The aim of this study is to carry out a review about the sorption of the constituents of liquid transported into the material in order to summarize what is already done in this field. We started with the theoretical study of sorption then the experimental one by showing the different methods used to measure the diffusivity of a contaminant towards the polymer then we enumerated the empirical and analytical models developed for predicting diffusivity and solubility coefficients and finally we showed the influence of this transfer on the mechanical characteristics and the morphology of thermoplastic pipes.
CFD Simulations and experimental investigation of nucleate pool boiling of liquid nitrogen
Authors: Bouazaoui Kenza , Agounoun Rachid , Kadiri Imad , Sbai Khalid 
Published: April 2020

Abstract
Pool boiling heat transfer is a very efficient mode of heat transfer. It is used in various energy conversion and heat exchange systems and in the cooling of high energy density electronic components. In this work, heat transfer during nucleate boiling for a brass ribbon horizontally immersed in liquid nitrogen is experimentally and numerically studied. An experimental apparatus was built to conduct a pool boiling heat transfer study. The capabilities of Computational fluid dynamics (CFD) boiling model in pool boiling heat transfer is investigated. The computational model used combines the Euler/Euler two-phase flow. The general measurements of the super-heat, the influences of super-heat on the triggering of the boiling, as well as the critical flux which represents an important issue for the security of the systems were analyzed. The results of numerical simulations were compared with experimental data.
Infrared-Active Modes in Finite and Infinite Hexagonal Boron Nitride
Authors: Boutahir Oussama , Lakhlifi Souhail , Boutahir Mourad , Fakrach Brahim , Rahmani Abdelhai , Chadli Hassane , Rahmani Abdelali 
Published: April 2020

Abstract
In this theoretical paper, we study the Infrared spectra of h-BN as a function of their lengths. Calculations are performed in the framework of the force constants model, using the spectral moments method. This original approach allows us to consider not only infinite h-BN sheet as usual in most theoretical models but also h-BN sheet with finite lengths. These predictions are useful to interpret the experimental data.
Effect of the integration of hemp wool as an insulation material for the construction of the roof and external walls of a typical Moroccan building
Authors: Dlimi M. , Agounoun R. , Kadiri I. , Sbai K. , Rahmani A. 
Published: April 2020

Abstract
This paper deals with the integration of thermal insulation in Moroccan buildings roofs and external walls in order to reduce energy consumption due to the use of air conditioning systems. The insulation material under investigation is the hemp wool, an ecofriendly material whose use allows the storage of the Carbone and help reducing greenhouse gas emissions. In order to assess the dynamic thermal performance of the typical Moroccan insulated building, a life cycle cost analysis is conducted based on annual cooling transmission loads specific to the climate of Meknes, Morocco. Optimum insulation thicknesses, energy savings and payback periods are determined for a building life-span of 20 years. Investigations are carried out based on an implicit finite difference method using a home-made code developed in Matlab.
Prediction of flexural strength of natural pozzolana and limestone blended concrete using machine learning based models
Authors: Wang Xiao-Yong 
Published: April 2020

Abstract
Natural pozzolana and limestone ternary blended concrete is a new type of limestone calcined clay cement (LC3) concrete. Natural pozzolana and limestone can benefit each other and contribute to the performance improvement of concrete. Flexural strength is an important engineering property of concrete. This study predicts the development of flexural strength of ternary blended concrete using machine learning based models, such as artificial neural networks (ANN) and gene expression programming (GEP). Concrete mixtures and curing ages are used as input parameters of ANN and GEP. Flexural strength is output parameter of ANN and GEP. The correlation coefficients of GEP and ANN model are 0.98 and 0.99, respectively. GEP and ANN can make reliable evaluations of flexural strengths of ternary blended concrete.
Tensile strength of multi-angle composite laminate scarf joints with FEM
Authors: Roy R , Kweon J-H , Nam Y 
Published: April 2020

Abstract
This study focus on the tensile strength of angle-ply composite laminate scarf joints and corresponding finite element modelling (FEM) methods. Tensile tests are performed at 25°C and 75°C on scarf joint specimens with unidirectional laminate stacking sequences. The joint tensile strength result values at 75°C represent around 86% of those obtained at 25°C. The tensile test is simulated with finite element modelling including cohesive elements to model failure. The joint adhesive film is represented either with only full thickness cohesive elements, or with thin or zero-thickness cohesive elements combined with solid elements having a plastic adhesive material model. Simulations results show that in the case of a unidirectional laminate, the adhesive modelling method had less than 1% effect on the simulated tensile failure strength. For quasi-isotropic laminates with a given ply angle count but of varying ply order, the simulated tensile failure strength varies up to 15%, which confirms tendencies reported in the literature.
Temperature Stable and Low Loss Microwave Dielectric Ceramics of Li2Mg3-xSrxTiO6
Authors: Shi Xiaolei , Zhang Huaiwu , Zhang Dainan 
Published: April 2020

Abstract
In this paper, a series of Li2Mg3-xSrxTiO6 (x = 0, 0.02, 0.04, 0.06, 0.08) ceramics were prepared by the conventional solid-state reaction method. The effects of Sr2+ substitution on the structure, morphology and microwave dielectric properties of Li2Mg3TiO6 ceramics were investigated. The X-ray diffraction (XRD) results indicated that Li2Mg3TiO6 and SrTiO3 phases stably coexisted with each other and formed composite materilas. The appearance of porous structure mainly originated from the volatilization of lithium at high sintering temperatures. As the Sr2+ content increased from 0 to 0.08, the optimum dielectric constant (ε

r
) increased from 13.61 to 17.32, the quality factor (Q×f) decreased monotonously and the temperature coefficient of resonant frequency (τ

f
) changed from -34.4 to +16.8 ppm/°C. The variations of ε

r
, Q×f and τ

f
could be explained by the Lichtenecker logarithmic model and mixing rule, respectively. In particular, optimal microwave dielectric properties of ε

r
= 16.08, Q×f = 82100 GHz, τ

f
= +1.7 ppm/°C were obtained for Li2Mg2.94Sr0.06TiO6 ceramic sintered at 1310 °C for 5h.
An Application of Failure Mode, Effects and Criticality Analysis (FMECA) for Composite Structures of Airplanes’ Wings
Authors: Wang Qiang , Xia Ruicong , Liu Qiuhan , Hu Qiuping 
Published: April 2020

Abstract
Composite structures have played a significant role in enhancing airplane’s performance However, defects inside can be a potential threat to flight safety. To resolve the hazard. FMECA was applied to the defect analysis of composite structures on airplane’s wing. And the failure mode of the highest criticality was found to be the impact damage. Then impact test on typical composite laminates was carried out. The caused damage was qualitatively analysed and proved impact of low energy brings latent risk. Practical solution was put forward to improve the safety or reliability of the applied composites in the airplane.
A method of measuring the arc radius of Rockwell diamond indenter
Authors: Yuanyuan CUI , Ming YE , Feng Zhang , Jiping Liu 
Published: April 2020

Abstract
Rockwell hardness is the most widely used hardness measurement method in industry at present. Taking superficial Rockwell primary standard machine in National Institute of Metrology(China) as an example, the uncertainty caused by the radius of the indenter arc accounts for 50% of the total uncertainty. In view of the important influence of the arc radius at the top of Rockwell diamond indenter on the evaluation of Rockwell hardness uncertainty, a profile projection system is established which is composed of lens, industrial camera and area-source of light. After pictures are obtained with camera, the next task for these pictures is to be calculated to get target parameter. The target parameter is obtained by profile extraction and radius calculation. In this paper, a new method is proposed as an algorithm criterion that sum of absolute value of data points and fitting arcs is used. Simplicity algorithm is introduced to iteratively solve the algorithm criterion. The purpose of using the algorithm is to eliminate the influence of outlier noise points. To verify the validity of the method in this paper, we conduct a series of experiments. The traceability experiment with standard sphere shows that the expanded uncertainty of the system of the instrument can achieve1.0µm,k=2.The uncertainty of measurement result with Rockwell diamond is1.5µm,k=2. The method in this paper bases on a simple-structural system, has high measurement accuracy, and can be used for rapid screening, evaluation, verification and calibration of Rockwell diamond indenters in industry.
Online fatigue damage evaluation method based on real-time cycle counting under multiaxial variable amplitude loading
Authors: Xue Long , Shang De Guang , Li Luo Jin 
Published: April 2020

Abstract
To realize on-line multiaxial fatigue damage evaluation for the servicing mechanical components, a real-time multiaxial cycle counting method is proposed, meanwhile, an online multiaxial fatigue damage evaluation method based strain-critical plane model is given and validated by the fatigue experimental data of En15r steel. Investigation showed that the proposed on-line multiaxial fatigue damage evaluation method could provide satisfactory evaluation results, and the real-time performance of the proposed cycle counting method is path-dependent.
Structure Design of Detachable Knotter mouth and Its Fatigue Performance Analysis
Authors: Cen Hai-Tang , Song Yu-Wei , Wei Rui-Tao , Li Ling , Qin Jian-Guo 
Published: April 2020

Abstract
Knotter mouth is the key part of the knotting on the knotter. Under the action of variable amplitude cyclic load, such as extrusion, shear, torsion and so on, the surface wear of knotter pliers and the fracture of clamp hooks are easy to occur. It takes a long time to disassemble and assemble the knotter mouth, which seriously affects the field operation efficiency of the square baler. In view of the present situation that the knotter mouth of D-type knotter is easy to fail and difficult to replace, on the premise of not affecting the normal knotting function of the knotter, the detachable knotter mouth is designed and completed by reasonably designing the thread structure and rotation direction of the knotter mouth. The disassembly and assembly time is significantly reduced, which is beneficial to the continuous operation of the square baler. ANSYS simulation analysis shows that, compared with the original knotter mouth, the maximum equivalent stress and maximum equivalent strain of the detachable knotter mouth are increased by less than 3%, and the maximum impact fatigue life of the detachable knotter mouth is 60 000 times. The fatigue life of the knotter mouth is much lower than that of the original knotter mouth, but it can still meet the rated life requirements of 40, 000 knotting times of the knotter. The research content makes full use of the safety margin of the knotter mouth structure, which has reference value for facilitating the maintenance and replacement of the knotter mouth and improving the operation efficiency of the whole machine.
Life Cycle Cost Analysis of Gas Turbine Air Inlet Filtration System
Authors: Bai Yunshan , Hao Jiangang , Tian Xin 
Published: April 2020

Abstract
As an important component of gas turbine, air inlet filtration system is of great significance for ensuring the normal operation of gas turbine. However, it is often difficult to select a suitable air inlet filtration system according to the operating characteristics of the unit and the external environment due to the large number of variables. From the perspective of life cycle cost, the main factors to be considered in the selection of inlet filtration system are discussed, and the corresponding calculation model is proposed. Through the cost calculation of a gas-steam combined cycle unit’s inlet filtration system during the whole life cycle, the influence of the initial cost, operation cost, maintenance cost and gas turbine performance degradation cost on the total cost is analyzed. The results show that the cost of gas turbine performance degradation accounts for 90.44%, and the initial cost only accounts for 0.62% in the total cost. Therefore, in the selection of the inlet filtration system, the system economy should be evaluated from the perspective of full life cycle cost. The calculation model has important guiding significance for the selection and cost calculation of the gas turbine inlet filtration system.
Multifunctional smart crib design
Authors: Xie Honghui , Sun Runxi , Yan Zhaojin , Wu Zhilin , Ni Weichuan 
Published: April 2020

Abstract
The environment for newborn babies is harsh, and it is often difficult for parents to understand whether the baby’s current environment is comfortable. Taking care of babies is the most troublesome thing for young parents. In order to let parents know more about the environmental changes around the crib, when the environment changes greatly, timely treatment, such as the temperature difference between day and night when the seasons are alternating, it is difficult for parents to grasp whether the current temperature of the crib is comfortable, and the baby often has a fever due to sudden changes in temperature at night. Through the use of various sensors to collect the surrounding environment of the crib, real-time monitoring of the temperature, moderate, gas and other environmental data around the crib, through the infrared temperature measurement module to measure the baby’s body temperature in real time, while adding music playback, shaking comfort, baby crying detection By uploading data to the cloud through the Internet of Things Internet of Things, parents can easily view the real-time status of the baby’s growing environment, providing a healthy, scientific, and comfortable environment for babies while reducing the burden on busy parents.
A reliability growth projection model based on similar failure mechanisms
Authors: Li Zhongsheng , Fan Jinwei , Chen Dongju 
Published: April 2020

Abstract
Reliability growth test is a common method to evaluate complex electromechanical systems in mechanical engineering. Reliability growth models are usually used to predict the reliability index of systems after the reliability test. AMSAA (army materials systems analysis activity) projection-model-stein (APMS) model is widely used for delayed corrective strategy, since it only requires limited assumptions but covers all failure data. However, there is a controversy about whether the Stein factor introduced in this model is reasonable. To alleviate the problem, an APMS development model is presented in this paper, because different types of parts have different inherent failure mechanisms. The study showed the projection results of the proposed model are credible. Moreover the Stein shrinkage factors were more reasonable and acceptable, as they were derived from the components with similar inherent failure mechanisms. These provide a technical foundation for the wide application of the proposed model.
Head gimbal assembly automated visual inspection by using digital image processing
Authors: Jaturawichanan Phonlawut , Tangjitsitcharoen Somkiat 
Published: April 2020

Abstract
This paper presented an approach of Digital Image Processing (DIP) and measurement properties of image region for inspecting the part in Head Gimbal Assembly (HGA) process. Current, the inspection process is performed by the skilled employee, which depends on employee experiences. The inspection method proposed by using digital image processing to do an image enhancement in order to detect the abnormalities and defects on part. The measurement properties of image region is proposed to identify the abnormality occurred on HGA part after image enhancement, in production process. This research aimed to develop the algorithm to inspected HGA part by considered the number of pads, convex area value, and eccentricity value. Then used measurement properties of image region to enhance the algorithm for classifying part in production process. This approach has been developed and proved with the real part in HGA production process. It’s proved that the algorithm and method proposed can be classified the part in HGA production process.