Resource Type

Journal Article 155

Conference Videos 1

Year

2023 8

2022 11

2021 15

2020 8

2019 12

2018 7

2017 5

2016 4

2015 5

2014 9

2013 8

2012 12

2011 2

2010 8

2009 7

2008 7

2007 5

2006 4

2005 2

2004 5

open ︾

Keywords

design parameters 4

influencing factor 4

influencing factors 4

sensitivity analysis 4

ANOVA 2

Box-Behnken method 2

Microplastics 2

concrete 2

kinetic parameters 2

mechanism 2

optimization 2

parameters optimization 2

scanning microwave radiometer 2

1D seismic site response analysis 1

Larix kaempferi 1

Nannochloropsis oculata 1

Phaeodactylum tricornutum Bohlin 1

N-nitrosodimethylamine (NDMA) 1

AMOEBA 1

open ︾

Search scope:

排序： Display mode:

Displacement characteristics of long span three-tower suspension bridge

Chen Ce, Yin Haihua

Strategic Study of CAE 2010, Volume 12, Issue 8,   Pages 79-82

Abstract: It also analyzes the influence of various parameters, such as the rigidity and height of the tower, the

Keywords： three-tower suspension bridge     Taizhou Bridge     displacement characteristics     influencing parameters    

HTML PDF Collect

Factors influencing peak bone mass gain

Xiaowei Zhu, Houfeng Zheng

Frontiers of Medicine 2021, Volume 15, Issue 1,   Pages 53-69 doi: 10.1007/s11684-020-0748-y

Abstract: Bone mass is a key determinant of osteoporosis and fragility fractures. Epidemiologic studies have shown that a 10% increase in peak bone mass (PBM) at the population level reduces the risk of fracture later in life by 50%. Low PBM is possibly due to the bone loss caused by various conditions or processes that occur during adolescence and young adulthood. Race, gender, and family history (genetics) are responsible for the majority of PBM, but other factors, such as physical activity, calcium and vitamin D intake, weight, smoking and alcohol consumption, socioeconomic status, age at menarche, and other secondary causes (diseases and medications), play important roles in PBM gain during childhood and adolescence. Hence, the optimization of lifestyle factors that affect PBM and bone strength is an important strategy to maximize PBM among adolescents and young people, and thus to reduce the low bone mass or osteoporosis risk in later life. This review aims to summarize the available evidence for the common but important factors that influence bone mass gain during growth and development and discuss the advances of developing high PBM.

Keywords： peak bone mass     children     adolescents     genetic     risk factors    

HTML PDF Collect

Microbial self-healing of cracks in cement-based materials and its influencing factors

Frontiers of Structural and Civil Engineering doi: 10.1007/s11709-023-0986-6

Abstract: Cement-based materials are brittle and crack easily under natural conditions. Cracks can reduce service life because the transport of harmful substances can cause corrosion damage to the structures. This review discusses the feasibility of using microbial self-healing agents for crack healing. Tubular and spherical carriers can be used to load microbial self-healing agents and protect microbes, which prolongs the self-healing time. The area self-healing ratio, permeability, mechanical strength, precipitation depth method, numerical modeling, and ultrasonic method can be employed to identify the self-healing effect of cracks. Moreover, the self-healing mechanism is systematically analyzed. The results showed that microbial self-healing agents can repair cracks in cement-based materials in underground projects and dam gates. The difficulties and future development of self-healing cracks were analyzed. A microbial self-healing agent was embedded in the cement-based material, which automatically repaired the developing cracks. With the development of intelligent building materials, self-healing cracks have become the focus of attention.

Keywords： cement-based materials     cracks     microbial self-healing agent     mechanism     intelligent building materials    

HTML PDF Collect

Factors influencing the photodegradation of

Bingbing XU, Zhonglin CHEN, Fei QI, Jimin SHEN, Fengchang WU

Frontiers of Environmental Science & Engineering 2009, Volume 3, Issue 1,   Pages 91-97 doi: 10.1007/S11783-009-0013-8

Abstract: In order to provide basic data for practical application,photodegradation experiment of -nitrosodimethylamine (NDMA) in aqueous solution was carried out with a low-pressure Hg lamp. Effects of the initial concentration of NDMA, solution pH, dissolved oxygen, and the presence of humic acid on NDMA photodegradation were investigated. NDMA at various initial concentrations selected in this study was almost completely photodegraded by UV irradiation within 20 min, except that at 1.07 mmol/L, NDMA could be photodegraded almost completely in the acidic and neutral solutions, while the removal efficiency decreased remarkably in the alkaline solution. Dissolved oxygen enhanced the NDMA photodegradation, and the presence of humic acid inhibited the degradation of NDMA. Depending on the initial concentration of NDMA, NDMA photodegradation by UV obeyed the pseudo-first-order kinetics. Dimethylamine, nitrite, and nitrate were detected as the photodegradation products of NDMA. O was found to be the reactive oxygen species present in the NDMA photodegradation process by UV, based on the inhibiting experiments using tert-butanol and sodium azide.

Keywords： N-nitrosodimethylamine (NDMA)     ultraviolet irradiation     degradation kinetic     dimethylamine     photodegradation product    

HTML PDF Collect

FACTORS INFLUENCING FOOD-WASTE BEHAVIORS AT UNIVERSITY CANTEENS IN BEIJING, CHINA: AN INVESTIGATION BASED

Frontiers of Agricultural Science and Engineering 2023, Volume 10, Issue 1,   Pages 83-94 doi: 10.15302/J-FASE-2022472

Abstract:

● Investigate the actual situation of food waste at university canteens in Beijing, China.

Keywords： university students     food waste behavior     theory of planned behavior     university canteen    

HTML PDF Collect

Factors influencing near infrared spectroscopy analysis of agro-products: a review

Xiao XU, Lijuan XIE, Yibin YING

Frontiers of Agricultural Science and Engineering 2019, Volume 6, Issue 2,   Pages 105-115 doi: 10.15302/J-FASE-2019255

Abstract: However, there are still more than 40 error sources influencing the robustness and accuracy of its calibration

Keywords： agro-product     error source     influence factor     near infrared spectroscopy    

HTML PDF Collect

Analysis of Influencing Factor of Brand Competitiveness

Bing Hongyan

Strategic Study of CAE 2002, Volume 4, Issue 5,   Pages 79-83

Abstract: The author tries to discuss countermeasures to improve brand competitiveness by analyzing the influencing

Keywords： brand competitiveness     influencing factor     analysis     countermeasure    

HTML PDF Collect

Indoor carbonyl compounds in an academic building in Beijing, China: concentrations and influencing factors

Chuanjia JIANG, Pengyi ZHANG

Frontiers of Environmental Science & Engineering 2012, Volume 6, Issue 2,   Pages 184-194 doi: 10.1007/s11783-011-0309-3

Abstract: Carbonyl compounds in indoor air are of great concern for their adverse health effects. Between February and May, 2009, concentrations of 13 carbonyl compounds were measured in an academic building in Beijing, China. Total concentration of the detected carbonyls ranged from 20.7 to 189.1 μg·m , and among them acetone and formaldehyde were the most abundant, with mean concentrations of 26.4 and 22.6 μg·m , respectively. Average indoor concentrations of other carbonyls were below 10 μg·m . Principal component analysis identified a combined effect of common indoor carbonyl sources and ventilation on indoor carbonyl levels. Diurnal variations of the carbonyl compounds were investigated in one office room, and carbonyl concentrations tended to be lower in the daytime than at night, due to enhanced ventilation. Average concentrations of carbonyl compounds in the office room were generally higher in early May than in late February, indicating the influence of temperature. Carbonyl source emission rates from both the room and human occupants were estimated during two lectures, based on one-compartment mass balance model. The influence of human occupants on indoor carbonyl concentrations varies with environmental conditions, and may become significant in the case of a large human occupancy.

Keywords： carbonyl compounds     indoor air     ventilation     human occupancy     source emission rate (SER)     principal component analysis (PCA)    

HTML PDF Collect

Characteristics and Influencing Factors of Microplastics in Snow in the Inner Mongolia Plateau, China

Hongwei Yu,Junrong Shao,Huawei Jia,Diga Gang,Baiwen Ma,Chengzhi Hu,

Engineering doi: 10.1016/j.eng.2023.02.007

Abstract: Microplastics (MPs; < 5 mm) have become one of the most prominent global environmental pollution problems. MPs can spread to high altitudes through atmospheric transport and can be deposited by rainfall or snowfall, potentially threatening the structure and function of natural ecosystems. MPs in terrestrial and aquatic ecosystems alter the growth and functional characteristics of organisms. However, little attention has been given to the possible harm associated with MPs deposited in snow, particularly in the context of global climate warming. MPs collected from surface snow in the Inner Mongolia Plateau, China, were used for quantitative analysis and identification. The results showed that MPs were easily detected, and the related concentration was approximately 68 ± 10–199 ± 22 MPs·L−1 in snow samples. Fibers were the most common morphology, the polymer composition was largely varied, and the abundance and composition of MPs were linked to human activity to a great extent. High-throughput sequencing results showed that the composition and abundance of microorganisms also differed in snow samples from areas with different MP pollution characteristics, indicating a considerable difference in microbial functional diversity. MPs may have an interference effect on the individual growth and functional expression of microorganisms in snow. In addition, the results showed that functional living areas (e.g., landfills and suburban areas) in cities play an important role in the properties of MPs. For instance, the highest abundance of MPs was found in thermal power plants, whereas the abundance of polymers per sample was significantly lower in landfills. The MP contaminants hidden in snow can alter microbial structure and function and are therefore a potential threat to ecosystem health.

Keywords： Human activities     Snow     Microplastics     Microbial community     Urban function     Environmental effect    

HTML PDF Collect

Antibiotic resistance genes in manure-amended paddy soils across eastern China: Occurrence and influencing

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 7, doi: 10.1007/s11783-021-1499-y

Abstract:

• Manure fertilization resulted in antibiotic residues and increased metal contents.

Keywords： Pig manure     Antibiotics     Metals     Antibiotic resistance genes     Paddy fields    

HTML PDF Collect

Inverse identification of the mechanical parameters of a pipeline hoop and analysis of the effect of

Ye GAO, Wei SUN

Frontiers of Mechanical Engineering 2019, Volume 14, Issue 3,   Pages 358-368 doi: 10.1007/s11465-019-0539-9

Abstract: pipeline system effectively and analyze its vibration characteristics, the mechanical characteristic parametersThe procedure of identifying such parameters was described based on the measured natural frequenciesA case study was performed, and the mechanical parameters of the hoop were identified using the proposed

Keywords： inverse identification     pipeline hoop     frequency response function     mechanical parameters     preload    

HTML PDF Collect

Analysis of synergy degree and its influencing factors in hydropower EPC project management

Jiwei ZHU, Hua GAO, Jiangrui WANG

Frontiers of Engineering Management 2021, Volume 8, Issue 3,   Pages 402-411 doi: 10.1007/s42524-020-0098-0

Abstract: The use of engineering procurement construction (EPC) mode is currently a trend in hydropower engineering construction. The clarification of the internal relationship between hydropower EPC projects and the realization of synergy has great significance in improving management efficiency and implementation effect. In this work, a three-dimensional system and a system model of hydropower EPC project management synergy are constructed. The mechanism and factors that influence the degree of management synergy are analyzed on the basis of management synergy theory. Furthermore, the evaluation index system and the degree of synergy model are established, and grey relational analysis is utilized to identify the key factors that affect the synergy degree. Thus, this study aims to facilitate the hydropower EPC project management synergy, provide a quantitative method for synergy degree evaluation, and propose corresponding promotion strategies. Results show that the order degree of each subsystem presents a steady upward trend. Specifically, the order degree of the subsystem at the trial operation stage is low, which is the major restriction on the further improvement of the synergy degree of EPC project management. The key factors in improving the synergy level of hydropower EPC project management are mainly concentrated in the information and organization synergy subsystems, including the construction degree of information platform, the performance of functions, the timeliness of information transfer, and the functions of the information platform.

Keywords： hydropower project     EPC mode     synergy degree model     grey relational analysis    

HTML PDF Collect

Impact of anthropogenic heat emissions on meteorological parameters and air quality in Beijing using

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 4, doi: 10.1007/s11783-021-1478-3

Abstract:

The Large scale Urban Consumption of energ Y model was updated and coupled with WRF.

Keywords： Anthropogenic heat emissions     LUCY     High-resolution     Meteorological parameters     Air quality    

HTML PDF Collect

Effect of thermodynamic parameters on the performance of refrigerator-ejector

Lihong CAO, Yicai LIU, Chao WAN, Tianlong XIN, Qian HUANG, Mingyan ZHANG

Frontiers in Energy 2010, Volume 4, Issue 4,   Pages 517-521 doi: 10.1007/s11708-010-0004-2

Abstract: The effect of thermodynamic parameters (the pressure of primary fluid and secondary fluid) on the performanceThe boundary conditions were set according to the actual operating condition and the parameters of refrigerator

Keywords： refrigerator-ejector     FLUENT     thermodynamic parameters     entrainment ratio performance    

HTML PDF Collect

Effects of critical geometric parameters on the optical performance of a conical cavity receiver

Hu XIAO, Yanping ZHANG, Cong YOU, Chongzhe ZOU, Quentin FALCOZ

Frontiers in Energy 2019, Volume 13, Issue 4,   Pages 673-683 doi: 10.1007/s11708-019-0630-2

Abstract: with different geometric shapes, but less research is conducted on the effects of critical geometric parameters

Keywords： parabolic collector     conical cavity receiver     critical geometric parameters     optical performance    

HTML PDF Collect

Title Author Date Type Operation

Displacement characteristics of long span three-tower suspension bridge

Chen Ce, Yin Haihua

Journal Article

Factors influencing peak bone mass gain

Xiaowei Zhu, Houfeng Zheng

Journal Article

Microbial self-healing of cracks in cement-based materials and its influencing factors

Journal Article

Factors influencing the photodegradation of

Bingbing XU, Zhonglin CHEN, Fei QI, Jimin SHEN, Fengchang WU

Journal Article

FACTORS INFLUENCING FOOD-WASTE BEHAVIORS AT UNIVERSITY CANTEENS IN BEIJING, CHINA: AN INVESTIGATION BASED

Journal Article

Factors influencing near infrared spectroscopy analysis of agro-products: a review

Xiao XU, Lijuan XIE, Yibin YING

Journal Article

Analysis of Influencing Factor of Brand Competitiveness

Bing Hongyan

Journal Article

Indoor carbonyl compounds in an academic building in Beijing, China: concentrations and influencing factors

Chuanjia JIANG, Pengyi ZHANG

Journal Article

Characteristics and Influencing Factors of Microplastics in Snow in the Inner Mongolia Plateau, China

Hongwei Yu,Junrong Shao,Huawei Jia,Diga Gang,Baiwen Ma,Chengzhi Hu,

Journal Article

Antibiotic resistance genes in manure-amended paddy soils across eastern China: Occurrence and influencing

Journal Article

Inverse identification of the mechanical parameters of a pipeline hoop and analysis of the effect of

Ye GAO, Wei SUN

Journal Article

Analysis of synergy degree and its influencing factors in hydropower EPC project management

Jiwei ZHU, Hua GAO, Jiangrui WANG

Journal Article

Impact of anthropogenic heat emissions on meteorological parameters and air quality in Beijing using

Journal Article

Effect of thermodynamic parameters on the performance of refrigerator-ejector

Lihong CAO, Yicai LIU, Chao WAN, Tianlong XIN, Qian HUANG, Mingyan ZHANG

Journal Article

Effects of critical geometric parameters on the optical performance of a conical cavity receiver

Hu XIAO, Yanping ZHANG, Cong YOU, Chongzhe ZOU, Quentin FALCOZ

Journal Article