bluuebunny/crossref_metadata_2025_split huggingface dataset:
Exposure to traffic-related PM2.5 pollutants significantly affect the diversity and quantity of lung microbiota in a rat model
Authors: Wu Xiuli , Weng Zheng , Wen Song , Li Cunya , Li Xiaoyu 
Published: November 2020

Abstract
To investigate the microbial alteration of the lung in rats after the traffic-related PM2.5 exposure, thirty female rats had exposed to traffic-related PM2.5 and normal air for 17 days, the microbial changes were identified by Illumina high-throughput sequencing. The pathological structure and the microbial diversity of lungs in exposure groups were significantly changed. The most dominant phylum in lung microbiota changed from Firmicutes to Proteobacteria. Also, Sphingomonas was identified as the key differential bacterium between the exposure and control groups. The results suggest that traffic-related PM2.5 can affect the distribution of lung microbiota and may cause damage of the lung tissues and function.
Analysis on the main controlling factors of water-flowing fracture evolution in deep-buried and thick bedrock
Authors: Zheng Chao , Yu Lan , Sun Ning 
Published: November 2020

Abstract
The study on the evolution and development law of mining disturbed overlying rock fissures is the basic theory for mine water prevention and gas drainage. In order to reveal the evolution law of water conducting cracks in bedrock after deep burial, through the in-situ measurement of mining cracks in overlying strata in Huanglong mining area, the structural characteristics of overlying strata are calculated and analyzed by using key layer theory. It is found that the development height and shape of mining fissures are controlled by 8 direct influencing factors such as mining thickness and 10 indirect influencing factors such as subsidence space, in which mining size and roof overburden structure are the main control indexes. The development pattern of mining fracture is “trapezoid”. For the structural characteristics of roof overlying strata, this paper puts forward the ratio of soft rock proportion coefficient and permeability coefficient in the key layer load layer based on the key layer theory, which plays an important role in the actual development height of mining fissures and the incidence of water inrush.
Effects of water-saving technology application, disaster type and occurrence stage on disaster area of cotton field
Authors: Yu Yawen , Wei Jingzhou 
Published: November 2020

Abstract
The purpose of this paper is to analyze the impact of the application of water-saving technology, types of agricultural disasters and disaster stages on the affected area of cotton field by using the survey data. In this study, bootstrap method was used for quantile regression analysis of cotton disaster area. Four quantiles were selected in the analysis, which was 0.25, 0.5, 0.75 and 0.90. The results were compared with those of OLS regression analysis. The results indicate that the application of drip irrigation water-saving technology and the increase of irrigation expenditure have obvious negative correlation with cotton disaster area. Wind disaster, hail disaster, rain and waterlogging, drought, freezing damage and insect pests have obvious positive effects on the affected area of cotton, and the disease has no significant impact on the affected area of cotton field because of its strong controllability. The results of the study estimated the impact of water-saving technology and disaster types on cotton field disaster area in detail.
Study on the influence of temperature differences in the tunnel on ventilation system energy consumption
Authors: Zhu Yusheng , Zheng Guoping 
Published: November 2020

Abstract
The formula of the atmospheric pressure difference caused by the temperature difference in the tunnel and the environment outside the tunnel was established in this paper based on the Clapeyron equation to study the influence of the temperature difference between inside and outside the tunnel on the energy consumption of the ventilation system. Then, a scaled-down model tunnel is established. The air inside the model is heated by electric heating, the temperature and velocity of airflow along the center of the tunnel model are measured in detail, and the atmospheric pressure difference and wind speed in the model tunnel with different slopes are discussed. The results indicate that the tunnel has an obvious natural ventilation effect under specific temperature difference between inside and outside, and it becomes better as the slope increases. The shaft-type natural ventilation can promote the overall tunnel ventilation, and making full use of natural wind can save 15% of the energy consumption of mechanical ventilation.
Pollution source analysis and treatment strategy of intensive waste
Authors: Chen Lanyun , Wu Shuanglei 
Published: November 2020

Abstract
Intensive waste pollution is one of the main causes of serious pollution in many important water sources, and waste disposal has become an urgent problem to be solved. Controlling intensive waste pollution and carrying out the resource utilization of organic waste is the main way to solve my country’s environmental pollution problems. This paper examines the possible impact of intensive waste on the environment, and analyses the main methods of waste treatment measures and resource utilization, their effects and existing problems. Studies have shown that the adoption of waste treatment measures supported by modern biotechnology and engineering technology, the comprehensive utilization of waste resources based on the production of organic fertilizers and biofuels, and the establishment of a virtuous cycle of ecosystems will help promote sustainable development, improve the ecological environment and human settlements.
Variation laws of water content of lake silt in the process of flocculation concentration dehydration
Authors: Zheng Lixiang , Guo Zhongquan , Cui Dongfeng , Zhang Jun , Xu Xibo 
Published: November 2020

Abstract
In order to address the issues regarding the high water content, poor dewatering performance, and occupied space of landfill, the physical property tests and experiments on the lake silt samples were conducted. The effects of cationic polyacrylamide (CPAM), lime dosage, and dehydration time on the dehydration performance indexes such as the concentration ratio, the water content, and the decreasing ratio of water content of the lake silt with the initial water content of 91% were investigated. The results revealed that the concentration ratio reached 3.6 times when the dosage of CPAM was 40mg/L, and the water content decreased to 70% and the decreasing ratio of water content decreased to 29% after dehydration for 10min. The concentration ratio was about 2.6 times when the dosage of lime was 3.8g/L, and the water content decreased to 73% and the decreasing ratio of water content decreased to 24% after dehydration for 10min. The variation laws of water content of the lake silt with initial water content of 91%, 85%, and 80% after flocculation concentration dehydration was studied based on the concept of the decreasing ratio of water content. It was concluded that the decreasing ratio of water content was independent of the initial water content. It was only significantly proportional when the dosage of CPAM was 15∼45mg/L and lime was 1∼7g/L. The linear constant depended on the intrinsic properties of the lake silt. According to the variation laws of the water content and the water-hinge hypothesis, the calculation formula of the water content was proposed and the mechanism of critical addition value breaking the silt hinge in flocculation concentration dehydration was formulated.
Load calculation and effect of deformation observation around Mudanjiang seismic station
Authors: Li Jiye , Qin Liyan , Ma Longchen , Ma Baojun 
Published: November 2020

Abstract
With the acceleration of urbanization, the impact of human production and life on the earthquake observation environment is increasingly prominent. In order to study the influence of the construction of buildings (structures) around the observation station on the geophysical observation data, taking the deformation observation vertical pendulum tiltmeter and cavern strain gauge of Mudanjiang Seismic Station as examples, through field verification, inspection of instrument and equipment working state, environmental interference and meteorological factors, it was found that the construction time and direction of the southeast residential area of the observation station were related to the abnormal characteristics. In this study, based on the principle of superposition of normal concentrated force point load on the surface of semi-infinite body, the load change caused by the construction of station surrounding engineering was quantitatively calculated, and the influence degree of load was analyzed, which would provide support for further clarifying the interference source.
Research on development mode of characteristic towns in China from perspective of production of space
Authors: Tian Meiling 
Published: November 2020

Abstract
The development of characteristic towns is a systematic process with many subjects and elements. The production of space of characteristic towns is the process of reshaping the space of the town through various factors and finally forming various characteristic industries based on space. Based on the analysis of the concept of the production of space of characteristic towns, the pattern of manifestation of the influence of spatial production on local characteristics is summarized as the production of physical space, the production of industrial space, the production of cultural space, the production of community space and the production of market space. Then according to the pattern of manifestation of the production of space of characteristic towns, the development mode of characteristic towns can be divided into natural capital mode, industrial capital mode, cultural capital mode, community capital mode and market demand mode. Therefore, take the two batches of 403 national characteristic towns announced by the ministry of housing and urban-rural development as an example, the paper analyzes the utilization of the production of space combined with each town’s own characteristics industries, and explores the development law of characteristic towns in China. The result shows that, the quantity of characteristic towns is in the order of Western China, Eastern China, Central China and Northeast China in terms of region, the quantity of characteristic towns is in the order of cultural capital mode, natural capital mode, industrial capital mode, market demand mode and community capital mode in terms of the development mode, and the cultural capital mode has an absolute advantage, the community capital mode is quite different from other modes.
Research on land use efficiency of Zhongyuan Urban Agglomeration
Authors: Wang Wan , Dong Fan 
Published: November 2020

Abstract
The improvement of urban land use efficiency is of great significance for achieving high-quality economic growth and environmental sustainability. Based on the SBM-Undesirable model, the land use efficiency of 27 cities in Zhongyuan Urban Agglomeration was measured in 2005-2016, and the reasons of land use efficiency losses are also analyzed. Considering the status and differences of land use, the environmental-friendly recommendations in the region are put forward. The results show that during 2005-2016, the average land use efficiency of 27 cities in Zhongyuan Urban Agglomeration was 0.79, which was low in general but showed a “W” type fluctuating trend. The development of urban economy should not rely too much on the increase in land input and the expansion of urban boundaries but should turn to the improvement of the efficiency of stock land.
The water stability research of the rubber powder-modified asphalt mixture
Authors: Sun Jie , Lv Xi , Zhang Yao , Yang Jing 
Published: November 2020

Abstract
In recent years, research shows that crumb rubber modified asphalt can not only improve the pavement performance, but also reduce the pollution of waste tires. Therefore, based on the freeze-thaw test, the influence of hydrogen peroxide, rubber powder mesh number and rubber powder content on the stability of rubber modified asphalt mixture is studied. The results show that when the rubber powder content is 21% and the number of rubber powder mesh is 60, the rubber powder modified asphalt mixture has good stability, and hydrogen peroxide can improve the water stability of rubber powder modified asphalt mixture.
Ecological risk analysis of heavy metals in farmland soil based on Monte Carlo simulation
Authors: Zhu Huina , Xing Weiqin , Zhang Liangbo , Zhang Baozhong , Shi Fan , Li Liping , Chen Hanyu 
Published: November 2020

Abstract
This study is aimed to analyze ecological risk for heavy metals in farmland soil. In order to solve the problem of uncertainty in the risk assessment process, the potential ecological risk analysis based on Monte Carlo is established. The evaluation results showed that the probability of As belonging to low risk level was 100%; that of Pb belonging to low risk and medium risk were 34% and 66%; that of Cd belonging to extremely high risk and high risk were 97.44% and 2.56%. The risk of the three heavy metals was ranked as Cd > Pb > As. The probability of total risk belongs to extremely high risk and high risk was 99.48% and 0.52%. The method established in this study can reduce the error caused by a small sample. This study can put forward an objective evaluation methodology for the risk management of farmland pollution by heavy metals.
The research on the effect of different of straw instead of nitrogen fertilizer on soil fertilizer efficiency
Authors: Liu Wei , Zhu Zhe , Li Yaning , Zhang Chen , Li Guodong 
Published: November 2020

Abstract
To look for alternative fertilizer products, the application of wheat straw was explored in different forms instead of chemical fertilizer. The N, P, K, organic matter, humus, pH, germination rate in soil were determined to observe the effect on soil fertility. The results indicate that biochar had the best effect on soil fertility when straw was returned to the field in different forms; the effect of biochar on increasing the content of soil organic matter and humus was more obvious than the nitrogen fertilizer; biochar has little difference in total potassium; biochar has the most obvious effect on increasing the content of total nitrogen and available phosphorus. As a new type of fertilizer, biochar can replace chemical fertilizer which causes damage to soil environment. Biochar has the ability of fixing carbon and can slow down the greenhouse effect.
Water surface reflection characteristics and power generation of bifacial PV modules
Authors: Lu Wei , Tian Jiehua 
Published: November 2020

Abstract
The power generation characteristics of bifacial PV module on water surface are complicated. This paper proposed a water surface reflectivity model, which takes the light reflection characteristics on the calm water surface and the fluctuating water surface into consideration. The experimental data shows that the average absolute difference between actual water surface reflectivity and simulation data is 0.88%. A power generation model of the bifacial PV module was proposed on the basis of considering of the background reflectivity and the feature of bifacial PV module. The experimental data shows that the average absolute difference between actual PV power generation and simulation data is 2.1%. An approximate power generation enhancement ratio was proposed to estimate the power generation of bifacial PV module. Experimental results show that the average absolute difference between the approximate data and the actual data is 0.7%.
The influence of the outlet position and substrate on the nitrogen purification of vertical flow constructed wetlands
Authors: Xu Qiaoling , Wang Ping , Zhang Feng , Wang Li 
Published: November 2020

Abstract
To investigate the influence of outlet location on nitrogen removal in Vertical Flow Wetlands (VFWS), three VFWS, that were, wetland H (planting Pennisetum Hydridum), wetland X (planting Pennisetum purpureum Schum.) and wetland CK (no planting) were constructed. High, medium and low water outlets were set in each wetland, namely A, B and C. The main results were as followed: TN (total nitrogen) removal efficiency of A, B, C in H wetland was 61.3%, 55.4%, 53.2 %, and variance analysis was 100.2, 137.1, 177.8. A, B, C in X wetland was 58.3%, 56.6%, 50.2%, and variance analysis was 55.6, 68.8, 116.4. A, B, C in CK wetland was 53.1%, 51.5%, 50.2%, and variance analysis was 131.9, 188.7, 275.4, respectively. The content of nitrogen and urease activity in the substrate decreased with increasing of substrate depth. These results indicated that planting Pennisetum Hydridum and Pennisetum purpureum Schum. In VFW and appropriately raising outlet position could help improve nitrogen removal efficiency and obtain relatively stable effluent quality, and the upper substrate (0-10 cm) was the main site for nitrogen interception and purification. It can provide theoretical basis for the scientific construction and management of VFW.
Study on the capability of a bacterial strain for aniline degradation under some specific circumstances
Authors: Yuan Bowen , Wang Yun , Pan Rongbing 
Published: November 2020

Abstract
The purpose of the study is to explore the characteristics of a laboratory cultured bacterial strain Delftia sp. named AD1 for aniline degradation. Several degradation conditions were studied to provide information for biological treatment of aniline-containing wastewater. The bacterial strain AD1 is salt-tolerant, and the most suitable salt concentration for the growth of AD1 and the biodegradation of aniline is 5% (NaCl w/v), but when the salinity surpasses 5%, the growth of AD1 and the biodegradation of aniline could be restricted. The copper ion (Cu2+) had the most significant restriction impact on the growth of AD1, but up to 99.9% of aniline (initial concentration: 600mg/L) can be degraded under the effect of heavy metal ion. Both the single bacterial strain AD1 and mixed bacterial strains (AD1 and nitrifying bacteria) can efficiently degrade aniline, and the degradation rate of aniline for both groups reached 99.9%. However, the mixed bacterial strains did not show palpable advantage of the speed of aniline degradation over single bacterial strain AD1. Though nitrifying bacteria in the mixed bacterial strains was expected to degrade the ammonia nitrogen produced in aniline biodegradation process, there was no conspicuous difference in the concentration of ammonia nitrogen and total nitrogen between the samples of single bacterial strain AD1 and mixed bacterial strains.
The indication of soil microorganism to wetland restoration in Three River Source Area
Authors: Ling Jiankang , Mao Xufeng , Wei Xiaoyan , Tan Wenjia , Wu Yi , Zhang Yanchun , Bao Xianxia , Tong Lingling 
Published: November 2020

Abstract
Post-assessment of wetland restoration projects offers insight into project efficiency, effectiveness and sustainability. In order to evaluate the wetland restoration in three river source area, Qinghai Province, 16SrRNA high-throughput sequencing, OTU analysis, Alpha diversity analysis, etc., were used to analyze the soil microorganisms in the three restoration measures. Then, the species distribution and species richness cluster information were obtained. Compared with the wetland without any restoration measures, the results showed that the soil health index in three plots was higher or lower, which was specifically reflected in: replanting plot > rodent control plot > enclosure plot. Finally, the health status of alpine meadow wetland was comprehensively analyzed. The results in this work can offer reference for the restoration and protection of meadow wetland in Qinghai-Tibet Plateau.
The Effects of Epoxidised Natural Rubber (ENR-50) on Cure Characteristics and Tensile Properties of Recycled Natural Rubber Catheter Filled Ethylene Propylene Diene Monomer (EPDM) Vulcanizates
Authors: Zakaria Muhammad Salihin , Zulkepli Nik Noriman , Nordin Razif Muhammed , Halim Khairul Anwar Abdul , Hanafi Hafizuddin 
Published: November 2020

Abstract
The effect of epoxidised natural rubber (ENR-50) on cure characteristics and tensile properties (tensile strength, modulus at 100% elongation and elongation at break) of recycled natural rubber catheter filled ethylene propylene diene monomer (EPDM) vulcanizates were studied. The scorch time, t2 of EPDM/NRr blends with and without ENR-50 increased as NRr content increased while the cure time, t90 is decreased. However, with the presence of ENR-50 in EPDM/NRr blends, the t2 was longer and t90 was shorter than the uncompatibilized EPDM/NRr blends. The minimum torque, ML, of EPDM/NRr blend with and without ENR-50 relatively increased while maximum torque, MH, decreased with increasing NRr content. With the presence of ENR-50, the compatibilized EPDM/NRr blends exhibit a lower value of ML and MH compared with uncompatibilized blends. The incorporation of ENR-50 in EPDM/NRr blends enhanced the tensile strength and tensile modulus of compatibilized EPDM/NRr blends compared to uncompatibilized EPDM/NRr blends. The elongation at break (Eb) of compatibilized EPDM/NRr blends is lower than the uncompatibilized EPDM/NRr blends at all blend ratios. This indicated that ENR 50 improved the curing characteristics and tensile properties of the compound.
Structural, electronic and thermoelectric properties of SrTiO3 ceramic doped by lanthanum using first principles
Authors: Adewale Akeem Adekunle , Chik Abdullah , Zaki Ruhiyuddin Mohd 
Published: November 2020

Abstract
The Sr0.92La0.08TiO3 model compound was studied by means of the first-principles method grounded on the full-potential linearized augmented plane wave with the local orbital method as implement in WIEN2k. The structures, electronic and thermoelectric properties of the model compound are examined. Geometry optimization of Sr0.92La0.08TiO3 compound structure reveals the lattice constant of 3.9451 Å, which is the same as un-doped SrTiO3. The direct bandgap of 2.48 eV (Γ-Γ) was measured from computed electronic band structure and its displayed density of states for Sr0.92La0.08TiO3 sample. Transport properties were calculated using BoltzTraP code as implemented in the WIEN2k code. The results were analyzed as a function of the variable temperatures, the density of state and chemical potential. Temperature and density of state variation with transport properties are in the same trend. Chemical potential proves material as n-type via Seebeck coefficient. The thermoelectric performance ZT of 0.05 was obtained at room temperature, while maximum value of 3.79 was recorded at 1200 K.