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Factors affecting the distribution of microplastics in soils of China

Frontiers of Environmental Science & Engineering 2023, Volume 17, Issue 9, doi: 10.1007/s11783-023-1710-4

Abstract:

● Microplastic (MP) abundance in soil of China was highly heterogeneous.

Keywords： Microplastic distribution     Microplastic heterogeneity     Effecting factors     Agriculture     Socio-economicfactors    

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Changes in major factors affecting the ecosystem health of the Weihe River in Shaanxi Province, China

Qi LI, Jinxi SONG, Anlei WEI, Bo ZHANG

Frontiers of Environmental Science & Engineering 2013, Volume 7, Issue 6,   Pages 875-885 doi: 10.1007/s11783-013-0568-2

Abstract: variations and human activities on the ecosystem function of the Weihe River, the changes in major factorsaffecting its ecosystem health are determined, which include: 1) Deficiency of environment flow: since

Keywords： influencing factors     ecosystem health     ecological and environmental functions     the Weihe River     Shaanxi Province    

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Study on affecting factors of collaborative product development based on collaboration hierarchy model

ZHANG Xiaodong, LI Yingzi, ZHANG Zhiqiang

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 2,   Pages 210-213 doi: 10.1007/s11465-007-0036-4

Abstract: Based on the model, the affecting factors on collaboration levels are analyzed systematically from manyproblems of collaborative product development effectively, and help enterprises find out the critical factors

Keywords： development     web-based     business     collaborative     collaboration hierarchy    

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Factors affecting the seismic behavior of segmental precast bridge columns

Haitham DAWOOD,Mohamed ELGAWADY,Joshua HEWES

Frontiers of Structural and Civil Engineering 2014, Volume 8, Issue 4,   Pages 388-398 doi: 10.1007/s11709-014-0264-8

Abstract: This manuscript discusses the design parameters that potentially affect the lateral seismic response of segmental precast post-tensioned bridge piers. The piers consist of precast circular cross section segments stacked one on top of the other with concentric tendons passing through ducts made in the segments during casting. The bottommost segments of the piers were encased in steel tubes to enhance ductility and minimize damage. An FE model was used to investigate different design parameters and how they influence the lateral force – displacement response of the piers. Design parameters investigated included the initial post-tensioning stress as a percentage of the tendon yield stress, the applied axial stresses on concrete due to post-tensioning, pier aspect ratios, construction details, steel tube thicknesses, and internal mild steel rebar added as energy dissipaters. Based on the data presented, an initial tendon stress in the range of 40%-60% of its yield stress and initial axial stress on concrete of approximately 20% of the concrete’s characteristic strength is appropriate for most typical designs. These design values will prevent tendon yielding until lateral drift angle reaches approximately 4.5%. Changing the steel tube thickness, height, or a combination of both proved to be an effective parameter that may be used to reach a target performance level at a specific seismic zone.

Keywords： finite element analysis     concrete     precast units     bridges    

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Presentation of machine learning methods to determine the most important factors affecting road traffic

Hamid MIRZAHOSSEIN; Milad SASHURPOUR; Seyed Mohsen HOSSEINIAN; Vahid Najafi Moghaddam GILANI

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 5,   Pages 657-666 doi: 10.1007/s11709-022-0827-z

Abstract: The purpose of this research was to develop statistical and intelligent models for predicting the severity of road traffic accidents (RTAs) on rural roads. Multiple Logistic Regression (MLR) was used to predict the likelihood of RTAs. For more accurate prediction, Multi-Layer Perceptron (MLP) and Radius Basis Function (RBF) neural networks were applied. Results indicated that in MLR, the model obtained from the backward method with the correct percent of 84.7% and R2 value of 0.893 was the best method for predicting the likelihood of RTAs. Also, MLR showed that the variables of not paying attention to the front not paying attention to the frontroad ahead, followed byand then vehicle-motorcycle/bike accidents were the greatest problems. Among the models, MLP had a better performance, so that the prediction accuracy of MLR, MLP, and RBF were 84.7%, 96.7%, and 92.1%, respectively. MLP model, due to higher accuracy, showed that the variable of reason of accident had the highest effect on the prediction of accidents, and considering MLR results, the variables of not paying attention to the front and then vehicle-motorcycle/bike accidents had the most influence on the occurrence of accidents. Therefore, motorcyclists and cyclists are more prone to accidents, and appropriate solutions should be adopted to enhance their safety.

Keywords： safety     rural accidents     multiple logistic regression     artificial neural networks    

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Treatment, residual chlorine and season as factors affecting variability of trihalomethanes in small

Roberta DYCK,Geneviève COOL,Manuel RODRIGUEZ,Rehan SADIQ

Frontiers of Environmental Science & Engineering 2015, Volume 9, Issue 1,   Pages 171-179 doi: 10.1007/s11783-014-0750-1

Abstract: Seasonal variability in source water can lead to challenges for drinking water providers related to operational optimization and process control in treatment facilities. The objective of this study is to investigate seasonal variability of water quality in municipal small water systems (<3000 residents) supplied by surface waters. Residual chlorine and trihalomethanes (THM) were measured over seven years (2003–2009). Comparisons are made within each system over time, as well as between systems according to the type of their treatment technologies. THM concentrations are generally higher in the summer and autumn. The seasonal variability was generally more pronounced in systems using chlorination plus additional treatment. Chloroform, total THM (TTHM) and residual chlorine concentrations were generally lower in systems using chlorination plus additional treatment. Conversely, brominated THM concentrations were higher in systems using additional treatment. Residual chlorine was highest in the winter and lowest in the spring and summer. Seasonal variations were most pronounced for residual chlorine in systems with additional treatment. There was generally poor correlation between THM concentrations and concentrations of residual chlorine. Further study with these data will be beneficial in finding determinants and indicators for both quantity and variability of disinfection byproducts and other water quality parameters.

Keywords： drinking water     residual chlorine     seasonal variability     small municipal systems     treatment technologies     trihalomethanes    

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Factors affecting simultaneous nitrification and denitrification in an SBBR treating domestic wastewater

LI Jun, GU Guowei, PENG Yongzhen, WEI Su

Frontiers of Environmental Science & Engineering 2007, Volume 1, Issue 2,   Pages 246-250 doi: 10.1007/s11783-007-0042-0

Abstract: An aerobic sequencing batch biofilm reactor (SBBR) packed with Bauer rings was used to treat real domestic wastewater for simultaneous nitrification and denitrification. The SBBR is advantageous for creating an anoxic condition, and the biofilm can absorb and store carbon for good nitrification and denitrification. An average concentration of oxygen ranging from 0.8 to 4.0 mg/L was proved very efficient for nitrification and denitrification. Volumetric loads of TN dropped dramatically and effluent TN concentration increased quickly when the concentration of average dissolved oxygen was more than 4.0 mg/L. The efficiency of simultaneous nitrification and denitrification (SND) increased with increasing thickness of the biofilm. The influent concentration hardly affected the TN removal efficiency, but the effluent TN increased with increasing influent concentration. It is suggested that a subsequence for denitrification be added or influent amount be decreased to meet effluent quality requirements. At optimum operating parameters, the TN removal efficiency of 74% 82% could be achieved.
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Factors affecting production of nonaqueous peracetic acid in tubular packed reactors

ZHANG Tengyun, FAN Hongbo, ZHONG Li, CHUANG Karl

Frontiers of Chemical Science and Engineering 2008, Volume 2, Issue 2,   Pages 196-203 doi: 10.1007/s11705-008-0037-9

Abstract: The influencing factors of the reacting system including packing material, oxygen carrier, and reactor
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Factors affecting early embryonic development in cattle: relevance for bovine cloning

Yanna DANG, Kun ZHANG

Frontiers of Agricultural Science and Engineering 2019, Volume 6, Issue 1,   Pages 33-41 doi: 10.15302/J-FASE-2018228

Abstract:

Female infertility represents a major challenge for improving the production efficiency in the dairy industry. Historically, fertility has declined whereas milk yield has increased tremendously due to intensive genetic selection. evidence reveals about 60% pregnancy loss takes place during the first month following fertilization. Meanwhile, early embryo development is significant for somatic cell nuclear transfer in cattle as a large proportion of cloned embryos fail to develop beyond peri-implantation stage. Oocyte quality is of utmost importance for the early embryo to develop to term for both fertilized and cloned embryos. Epigenetic reprogramming is a key process occurring after fertilization and critical roles of epigenetic modifiers during preimplantation development are now clear. Incomplete epigenetic reprogramming is believed to be a major limitation to cloning efficiency. Treatment of cloned embryos with epigenetic modifying drugs (e.g., Trichostatin A) could greatly improve cloning efficiency in both mice and cattle. Recently, the rapid progress in high-throughput sequencing technologies has enabled detailed deciphering of the molecular mechanisms underlying these events. The robust efficiency of genomic editing tools also presents an alternative approach to the functional annotation of genes critical to early development.

Keywords： bovine cloning     embryo development     somatic cell nuclear transfer     X-inactive specific transcript    

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Factors affecting photocatalytic performance through the evolution of the properties due to the phase

Frontiers in Energy 2022, Volume 16, Issue 3,   Pages 471-482 doi: 10.1007/s11708-021-0778-4

Abstract: sub>2O to BiO2–x has been investigated to understand the important factors

Keywords： composite construction     distribution     BiO2–x     evolution of defects    

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Influencing factors research of GPS buoy measurement precision

Yan Longhao,Chen Chuntao,Zhai Wanlin,Zhu Jianhua,Zhang Qian,Zhang Xiaoxu

Strategic Study of CAE 2014, Volume 16, Issue 6,   Pages 102-108

Abstract: simulation and experiment about the self-developed GPS buoy, this paperstudied the precision of GPS bouy and factorsaffecting.The results show that the self-developed GPS GPS buoy elevation measurement precision can

Keywords： GPS     buoy     precision     factors affecting     altimeter     calibration    

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Factors affecting the formation of zeolite seed layers and the effects of seed layers on the growth of

ZHANG Xiongfu, WANG Jinqu, LIU Hai′ou, WANG Anjie

Frontiers of Chemical Science and Engineering 2007, Volume 1, Issue 2,   Pages 172-177 doi: 10.1007/s11705-007-0032-6

Abstract: The present study investigates the formation of silicalite-1 seed layers on a porous carbon support of 0.5 μm pore size and α-A1O supports with different pore sizes (0.1 μm and 4 μm) via the slip-casting technique. The effects of support property, seed size and solvent on the formation of seed layers were investigated in detail. The growth of silicalite-1 membranes on different seeded supports by hydrothermal synthesis was also evaluated. The scanning electron microscopy (SEM) and X-ray diffraction (XRD) characterizations indicate that a continuous seed layer can be obtained on the smooth support of 0.1 μm pore size by using any seed of 100 nm, 600 nm or 2.2 μm in size, whereas, on the coarse supports with either 0.5 μm or 4 μm pore size, a continuous seed layer cannot be formed using the above seed sizes and the same seeding time. At a longer contact time, a seed layer can also be formed using 100 nm seed on the supports with larger pore size. However, the layer is not uniform and smooth. For a hydrophobic porous carbon support, seeding ethanol suspension, which has weak polarity, favors the formation of a continuous seed layer. The seed layers and membranes grown from the smaller seed are more uniform and continuous and possess smoother surfaces than those from the larger seed. The seed layer and respective grown membrane formed from nanosized seed (100 nm) are the most uniform and compact. With this method of seeded secondary synthesis of zeolite membranes, the quality of a membrane mainly depends on the quality of the seed layer.

Keywords： silicalite-1     α-A1O     growth     seeding ethanol     quality    

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The Experimental Research on Affecting Factors on Bearing Capacity of Steel Fiber Reinforced Concrete

Sun Chengfang,Gu Qian,Chen Xizi,Peng Shaomin

Strategic Study of CAE 2003, Volume 5, Issue 6,   Pages 79-83

Abstract: mid-point on the bottom of specimens and the strain of concrete and tension bearing steel bar, the main factors

Keywords： steel fiber     fiber reinforced concrete     pile thick cap     bearing capacity     affecting factors    

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Study on factors affecting TB/HIV co-infection in four counties of China

Shi-Ming CHENG MD, Yu-Ji LAI MS, Er-Yong LIU MS, Lin ZHOU MD, Xue-Jing WANG MS, Qiu-Lan CHEN MS, Dong-Ming LI MS, Ning WANG MD,

Frontiers of Medicine 2010, Volume 4, Issue 2,   Pages 185-191 doi: 10.1007/s11684-010-0040-7

Abstract: The factors affecting case detection of tuberculosis (TB)/human immunodeficiency virus (HIV) co-infectionPatients also completed questionnaires on potential factors affecting TB/HIV co-infection.

Keywords： tuberculosis/acquired immunodeficiency syndrome     dual infection     prevention and control     case detection     impact factors    

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Analysis of factors affecting passengers ’ mountain sickness basedon nonparamertric tests

Chang Haijuan,Liu Meng,Pang Liping,Yang Peng,Wang Jun

Strategic Study of CAE 2009, Volume 11, Issue 2,   Pages 65-69

Abstract: samples were taken in Qinghai- Tibet railway cars, and 1 693 samples were taken out randomly, then the factorsdone this work by nonparametric statistics and correlation analysis , and got the conclusion that five factors

Keywords： mountain sickness     impacting factors     Qinghai- Tibet railway     nonparametric tests     individual’ shypoxia    

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Title Author Date Type Operation

Factors affecting the distribution of microplastics in soils of China

Journal Article

Changes in major factors affecting the ecosystem health of the Weihe River in Shaanxi Province, China

Qi LI, Jinxi SONG, Anlei WEI, Bo ZHANG

Journal Article

Study on affecting factors of collaborative product development based on collaboration hierarchy model

ZHANG Xiaodong, LI Yingzi, ZHANG Zhiqiang

Journal Article

Factors affecting the seismic behavior of segmental precast bridge columns

Haitham DAWOOD,Mohamed ELGAWADY,Joshua HEWES

Journal Article

Presentation of machine learning methods to determine the most important factors affecting road traffic

Hamid MIRZAHOSSEIN; Milad SASHURPOUR; Seyed Mohsen HOSSEINIAN; Vahid Najafi Moghaddam GILANI

Journal Article

Treatment, residual chlorine and season as factors affecting variability of trihalomethanes in small

Roberta DYCK,Geneviève COOL,Manuel RODRIGUEZ,Rehan SADIQ

Journal Article

Factors affecting simultaneous nitrification and denitrification in an SBBR treating domestic wastewater

LI Jun, GU Guowei, PENG Yongzhen, WEI Su

Journal Article

Factors affecting production of nonaqueous peracetic acid in tubular packed reactors

ZHANG Tengyun, FAN Hongbo, ZHONG Li, CHUANG Karl

Journal Article

Factors affecting early embryonic development in cattle: relevance for bovine cloning

Yanna DANG, Kun ZHANG

Journal Article

Factors affecting photocatalytic performance through the evolution of the properties due to the phase

Journal Article

Influencing factors research of GPS buoy measurement precision

Yan Longhao,Chen Chuntao,Zhai Wanlin,Zhu Jianhua,Zhang Qian,Zhang Xiaoxu

Journal Article

Factors affecting the formation of zeolite seed layers and the effects of seed layers on the growth of

ZHANG Xiongfu, WANG Jinqu, LIU Hai′ou, WANG Anjie

Journal Article

The Experimental Research on Affecting Factors on Bearing Capacity of Steel Fiber Reinforced Concrete

Sun Chengfang,Gu Qian,Chen Xizi,Peng Shaomin

Journal Article

Study on factors affecting TB/HIV co-infection in four counties of China

Shi-Ming CHENG MD, Yu-Ji LAI MS, Er-Yong LIU MS, Lin ZHOU MD, Xue-Jing WANG MS, Qiu-Lan CHEN MS, Dong-Ming LI MS, Ning WANG MD,

Journal Article

Analysis of factors affecting passengers ’ mountain sickness basedon nonparamertric tests

Chang Haijuan,Liu Meng,Pang Liping,Yang Peng,Wang Jun

Journal Article