资源类型

期刊论文 415

会议视频 6

会议信息 2

年份

2024 11

2023 26

2022 36

2021 31

2020 27

2019 19

2018 28

2017 19

2016 15

2015 25

2014 24

2013 20

2012 21

2011 22

2010 19

2009 13

2008 14

2007 17

2006 6

2005 7

展开 ︾

关键词

评价指标 6

指标体系 5

制造强国 4

评价 4

COVID-19 3

Quantitative structure 2

imge analysis 2

stereology 2

制造业 2

制造大国 2

半滑舌鳎 2

可持续发展 2

效果评估 2

模糊综合评判 2

环境 2

目标识别 2

评价体系 2

评估 2

3-酰基硫代四酸 1

展开 ︾

检索范围:

排序: 展示方式:

Lunar In Situ Large-Scale Construction: Quantitative Evaluation of Regolith Solidification Techniques

Charun Bao,Daobo Zhang,Qinyu Wang,Yifei Cui,Peng Feng,

《工程(英文)》 doi: 10.1016/j.eng.2024.03.004

摘要: Lunar habitat construction is crucial for successful lunar exploration missions. Due to the limitations of transportation conditions, extensive global research has been conducted on lunar in situ material processing techniques in recent years. The aim of this paper is to provide a comprehensive review, precise classification, and quantitative evaluation of these approaches, focusing specifically on four main approaches: reaction solidification (RS), sintering/melting (SM), bonding solidification (BS), and confinement formation (CF). Eight key indicators have been identified for the construction of low-cost and high-performance systems to assess the feasibility of these methods: in situ material ratio, curing temperature, time, implementation conditions, compressive strength, tensile strength, curing dimensions, and environmental adaptability. The scoring thresholds are determined by comparing the construction requirements with the actual capabilities. Among the evaluated methods, regolith bagging has emerged as a promising option due to its high in situ material ratio, low time requirement, lack of high-temperature requirements, and minimal shortcomings, with only the compressive strength falling below the neutral score. The compressive strength still maintains a value of 2–3 MPa. The proposed construction scheme utilizing regolith bags offers numerous advantages, including rapid and large-scale construction, ensured tensile strength, and reduced reliance on equipment and energy. In this study, guidelines for evaluating regolith solidification techniques are provided, and directions for improvement are offered. The proposed lunar habitat design based on regolith bags is a practical reference for future research.

关键词: Lunar habitats     Lunar     in situ     construction     Regolith bag     Solidification and formation     In situ     materials     Evaluation method    

An index system for evaluation of agriculture green development at county level in China RESEARCH ARTICLE

《农业科学与工程前沿(英文)》 2024年 第11卷 第1期   页码 55-68 doi: 10.15302/J-FASE-2024536

摘要:

Agriculture green development (AGD) has become an unavoidable choice to address the unique national circumstances of China. This study established a county-level AGD evaluation index system, comprised three dimensions, food production, ecological environment and socioeconomic development, using 20 indicators. The assessment delved into historical trend and current situation, utilizing Spearman rank correlation analysis to analyze trade-off and synergy relationships, using Quzhou County, Hebei Province as a case study. The main findings were in four areas. Firstly, the index for AGD in Quzhou County increased by 58.9% from 1978 to 2019. The major contribution were the social economy (65.8%) and food production (53.5%), whereas the ecological environment was found to have had a negative impact. Secondly, in 2019, the AGD index was only 56.4, indicating substantial potential for improvement relative to the target value. A notable difference in scores existed between the three dimensions, with the order being ecological environment (66.3) > food production (61.7) > socioeconomic (41.3). Also, 90% of the indicators did not reach the target value. Thirdly, relationship analysis of the indicators revealed that the synergistic effect exceeded the trade-off effect. Specifically, 46.3% of the indicators had no significant relationship, 35.3% had a synergistic relationship, and 18.4% had a trade-off relationship. Finally, interdimensional indicator relationships exhibited a trade-off effect between the ecological environment and both food production and socioeconomic dimensions. However, a positive trend of synergy between production and ecology has emerged since 2015. In conclusion, the quantitative evaluation index system exposed the unbalanced development and significant potential relative to the target value of AGD in Quzhou County, despite notable progress.

关键词: Agriculture green development     index system     quantitative evaluation     Spearman correlation analysis    

Post-evaluation of a water pollution control plan: methodology and case study

Lin ZENG,Xin DONG,Siyu ZENG,Tianzhu ZHANG,Jing LI,Jining CHEN

《环境科学与工程前沿(英文)》 2015年 第9卷 第4期   页码 712-724 doi: 10.1007/s11783-015-0773-2

摘要: China has developed more than 20 water pollution control plans for river basins (RBWPs) since 1996. However, the implementation has generally lagged. This paper proposes a three-step, post-evaluation methodology to analyze the implementation result of a RBWP and its influential factors. First, a multi-attribute evaluation method based on an index system is established to score the enforcement results of a RBWP. Indicators measure how well a RBWP has achieved its objectives, which include water quality compliance, pollution load control, project construction, financial inputs, and related management requirements. Second, an interpretive structural model is used to detect the significant factors that affect RBWP implementation. This model can effectively analyze the cause-effect chain and hierarchical relationship among variables. Five groups of factors were identified, namely, plan preparation, water resource endowment, policy, institution, and management. Both qualitative and quantitative methods are employed in the third step to evaluate the extent to which these factors have influenced the execution result of a RBWP, including pre-post contrast, scenario analysis, and correlation analysis. This research then post-evaluated the implementation of the Huai River Basin water pollution control plans (H-RBWPs) over a period of 10 years as a case study. Results showed that the implementation of the H-RBWPs was unsatisfactory during 2001–2005, although it improved during 2006–2010. The poor execution of these plans was partially caused by the underestimation of regional economic development in combination with ineffective industrial structure adjustment policies. Therefore, this case study demonstrates the feasibility and flexibility of the proposed post-evaluation methodology.

关键词: river basin     water pollution control plan     post plan evaluation     multi-attribute comprehensive evaluation     interpretive structural model     combined qualitative/quantitative method    

基于门控自编码器的驾驶行为量化评价标准化策略 Research Articles

何欣,张哲,许力,俞佳培

《信息与电子工程前沿(英文)》 2022年 第23卷 第3期   页码 452-462 doi: 10.1631/FITEE.2000667

摘要: 在评估驾驶风格时,对驾驶行为的标准化至关重要。本文对车辆的纵向控制进行了研究。通过归一化任务将不同环境中的驾驶行为映射到统一条件下。前人工作采用必要的驾驶员模型进行驾驶循环测试;与这种基于模型的方法不同,我们提出的方法在遵循标准速度曲线时使用自动编码器直接对驾驶行为进行标准化。为确保车速和驾驶行为之间满足正相关约束条件,在编码器和解码器之间设计了门控函数。所提方法无需模型且高效。测试结果验证了该方法与已有方法的一致性。同时,测试了其在驾驶行为和燃料消耗分析的定量评估中的应用。仿真结果验证了所提方法的有效性。

关键词: 驾驶行为;标准化;门控自编码器;定量评价    

Evaluation of the relative risk of stroke in patients with hypertension using cerebrovascular hemodynamic

HUANG Jiuyi, WANG Guiqing, GUO Jiping, CAO Yifeng, WANG Yan, YANG Yongju, YU Xuehai

《医学前沿(英文)》 2007年 第1卷 第3期   页码 274-278 doi: 10.1007/s11684-007-0052-0

摘要: The relative risk (RR) of stroke in patients with hypertension was evaluated by using synthetic index of cerebrovascular hemodynamics. A total of 7,371 patients with hypertension with ages ≥40 years were selected from a population-based cohort study of the risk factors for stroke. The data on the baseline investigation of risk factors, the determination of cerebrovascular hemodynamic parameters (CVHP), and stroke follow-up were analyzed. The RR of stroke in patients with hypertension was evaluated by CVHP scores. Univariate analysis indicated that hypertension, complicated by other risk factors, had significant statistical association with the onset of stroke. RRs for stroke when hypertension complicated with decrease of hemodynamic scores, heart disease, cigarette smoking and alcohol consumption were 4.93 (95%CI, 3.26–7.45), 1.90 (95%CI, 1.36–2.66), 1.99 (95%CI, 1.42–2.79) and 1.73 (95%CI, 1.19–2.53) respectively. In multivariate analysis, hemodynamic score, age, sex, cigarette smoking, family history of stroke and systolic blood pressure were selected by the Cox regression for inclusion in the final analysis. Among them, the RR of hemodynamic score was highest. The analysis of doseresponse relationships indicated that when the hemodynamic scores in patients with hypertension were lower than 75 points, the RR of stroke at 75, 60, 45, 30 and 15 points were 2.85, 4.43, 4.54, 5.40 and 9.88, respectively. The risk of stroke in patients with hypertension is closely asso ciated with hemodynamic impairment and the hemodynamic score may be used for quantitative evaluation of relative risks of stroke.

关键词: inclusion     quantitative evaluation     cerebrovascular     relative     decrease    

The defect-length effect in corrosion detection with magnetic method for bridge cables

Qiwei ZHANG, Rongya XIN

《结构与土木工程前沿(英文)》 2018年 第12卷 第4期   页码 662-671 doi: 10.1007/s11709-018-0512-4

摘要:

Quantitative evaluation of the steel corrosion in cables is significant for the safe operation of cable-supported bridges. The magnetic flux (MF) examination shows great potential to detect the corrosion defect, or loss of metallic cross-sectional area (LMA). An LMA defect in steel cables can be measured accurately when it is longer than a certain length. However, for defects in early stage, where the length of corrosion area is short, the MF examination may produce unacceptable error. In this study, the effect of defect length on the MF examination for corrosion detection of bridge cables is investigated through theoretical analysis and model experiments. An original analytical model to quantify the influence of defect length is proposed based on the equivalent magnetic circuit method. Then, MF examination experiments are performed on a series of cable models with different defect lengths and locations to verify the analytical model. Further, parameter study is conducted based on the proposed analytical model to clarify the mechanism of the defect-length effect. The results show that the area loss caused by short corrosion damage will be underestimated if the defect-length effect is neglected, and this effect can be quantified efficiently with the proposed analytical model.

关键词: bridge cable     corrosion detection     defect length     MF examination     quantitative evaluation    

A computational toolbox for molecular property prediction based on quantum mechanics and quantitative

《化学科学与工程前沿(英文)》 2022年 第16卷 第2期   页码 152-167 doi: 10.1007/s11705-021-2060-z

摘要: Chemical industry is always seeking opportunities to efficiently and economically convert raw materials to commodity chemicals and higher value-added chemical-based products. The life cycles of chemical products involve the procedures of conceptual product designs, experimental investigations, sustainable manufactures through appropriate chemical processes and waste disposals. During these periods, one of the most important keys is the molecular property prediction models associating molecular structures with product properties. In this paper, a framework combining quantum mechanics and quantitative structure-property relationship is established for fast molecular property predictions, such as activity coefficient, and so forth. The workflow of framework consists of three steps. In the first step, a database is created for collections of basic molecular information; in the second step, quantum mechanics-based calculations are performed to predict quantum mechanics-based/derived molecular properties (pseudo experimental data), which are stored in a database and further provided for the developments of quantitative structure-property relationship methods for fast predictions of properties in the third step. The whole framework has been carried out within a molecular property prediction toolbox. Two case studies highlighting different aspects of the toolbox involving the predictions of heats of reaction and solid-liquid phase equilibriums are presented.

关键词: molecular property     quantum mechanics     quantitative structure-property relationship     heat of reaction     solid-liquid phase equilibrium    

Erratum to: Using pyrosequencing and quantitative PCR to analyze microbial communities

Husen ZHANG

《环境科学与工程前沿(英文)》 2011年 第5卷 第3期   页码 488-488 doi: 10.1007/s11783-011-0342-2

布达拉宫古建筑的火灾风险分析

庄磊,陆守香,王福亮

《中国工程科学》 2007年 第9卷 第3期   页码 76-81

摘要:

利用火灾风险分析的方法对具有重要历史和文物价值的布达拉宫古建筑进行安全评估。以建筑自身状 况、着火源控制、消防设施配备、人员疏散设施以及消防安全管理等方面的现状为切入点,对布达拉宫重点区域作了火灾危险性调查。在此基础上,引入半定量的火灾风险分析方法,分析影响布达拉宫古建筑火灾风险水平的 各因素。对体现火灾风险重要性的各参数划分等级并对其进行赋值。通过计算布达拉宫古建筑部分重点区域的火 灾风险值,分析不同区域的相对火灾风险水平。最后提出一些火灾防治的对策。

关键词: 布达拉宫     古建筑     火灾风险分析     半定量     火灾危险度    

Estimation of photolysis half-lives of dyes in a continuous-flow system with the aid of quantitative

Davoud BEIKNEJAD,Mohammad Javad CHAICHI

《环境科学与工程前沿(英文)》 2014年 第8卷 第5期   页码 683-692 doi: 10.1007/s11783-014-0680-y

摘要: In this paper the photolysis half-lives of the model dyes in water solutions and under ultraviolet (UV) radiation were determined by using a continuous-flow spectrophotometric method. A quantitative structure-property relationship (QSPR) study was carried out using 21 descriptors based on different chemometric tools including stepwise multiple linear regression (MLR) and partial least squares (PLS) for the prediction of the photolysis half-life ( ) of dyes. For the selection of test set compounds, a K-means clustering technique was used to classify the entire data set, so that all clusters were properly represented in both training and test sets. The QSPR results obtained with these models show that in MLR-derived model, photolysis half-lives of dyes depended strongly on energy of the highest occupied molecular orbital ( ), largest electron density of an atom in the molecule ( ) and lipophilicity (log ). While in the model derived from PLS, besides aforementioned and descriptors, the molecular surface area ( ), molecular weight ( ), electronegativity ( ), energy of the second highest occupied molecular orbital ( ) and dipole moment ( ) had dominant effects on logt values of dyes. These were applicable for all classes of studied dyes (including monoazo, disazo, oxazine, sulfonephthaleins and derivatives of fluorescein). The results were also assessed for their consistency with findings from other similar studies.

关键词: dye     photolysis half-life     quantitative structure-property relationship     continuous-flow     stepwise multiple linear regression     partial least squares    

Application of quantum chemical descriptors into quantitative structure-property relationship models

Yueping BAO, Qiuying HUANG, Wenlong WANG, Jiangjie XU, Fan JIANG, Chenghong FENG

《环境科学与工程前沿(英文)》 2011年 第5卷 第4期   页码 505-511 doi: 10.1007/s11783-011-0318-2

摘要: Quantitative structure-property relationship (QSPR) models were developed for prediction of photolysis half-life ( ) of polychlorinated biphenyls (PCBs) in water under ultraviolet (UV) radiation. Quantum chemical descriptors computed by the PM3 Hamiltonian software were used as independent variables. The cross-validated value for the optimal QSPR model is 0.966, indicating good prediction capability for lg values of PCBs in water. The QSPR results show that the largest negative atomic charge on a carbon atom ( ) and the standard heat of formation (Δ ) have a dominant effect on values of PCBs. Higher values or lower Δ values of the PCBs leads to higher lg values. In addition, the lg values of PCBs increase with the increase in the energy of the highest occupied molecular orbital values. Increasing the largest positive atomic charge on a chlorine atom and the most positive net atomic charge on a hydrogen atom in PCBs leads to the decrease of lg values.

关键词: photolysis     polychlorinated biphenyls (PCBs)     quantitative structure-property relationships (QSPRs)     quantum chemical descriptors    

基于定量属性的单目标视觉跟踪算法评价体系研究 Article

Wen-jing KANG, Chang LIU, Gong-liang LIU

《信息与电子工程前沿(英文)》 2020年 第21卷 第3期   页码 405-421 doi: 10.1631/FITEE.1900245

摘要: 视觉跟踪是计算机视觉领域热门研究课题之一。近年来,很多先进跟踪算法和性能评价基准相继发布,并取得巨大成功。现有评价体系大多定位于衡量整体性能,无法通过针对性的详细论证评估跟踪器的优势和缺点,且很多常用评测指标缺乏令人信服的含义解释。本文从测试数据、测试方法、测试指标3方面深入分析跟踪评价体系的细节。首先,归纳整理了12个反映图像序列不同特性的帧间视觉属性,并首次定量给出其归一化公式。基于这些属性定义,提出两种新的测试方法,即基于相关性的测试和基于权重的测试,使评价体系能更直观、更清晰地评定跟踪器各方面性能。然后,将所提测试方法应用于著名的跟踪挑战赛,即Video Object Tracking (VOT) Challenge 2017。测试结果表明,在目标尺寸快速或剧烈变化时,跟踪器大多表现不佳,即使基于深度学习的先进跟踪器也未能很好解决这一问题。此外发现,中心位置差错(center location error,CLE)性能指标虽未考虑到目标尺度,在实际测试中仍对目标尺寸变化很敏感。

关键词: 视觉跟踪;性能评价;视觉属性;计算机视觉    

Design and use of group-specific primers and probes for real-time quantitative PCR

Juntaek LIM, Seung Gu SHIN, Seungyong LEE, Seokhwan HWANG

《环境科学与工程前沿(英文)》 2011年 第5卷 第1期   页码 28-39 doi: 10.1007/s11783-011-0302-x

摘要: Real-time quantitative polymerase chain reaction (qPCR) has gained popularity as a technique to detect and quantify a specific group of target microorganisms from various environmental samples including soil, water, sediments, and sludge. Although qPCR is a very useful technique for nucleic acid quantification, accurately quantifying the target microbial group strongly depends on the quality of the primer and probe used. Many aspects of conducting qPCR assays have become increasingly routine and automated; however, one of the most important aspects, designing and selecting primer and probe sets, is often a somewhat arcane process. In many cases, failed or non-specific amplification can be attributed to improperly designed primer-probe sets. This paper is intended to provide guidelines and general principles for designing group-specific primers and probes for qPCR assays. We demonstrate the effectiveness of these guidelines by reviewing the use of qPCR to study anaerobic processes and biologic nutrient removal processes. qPCR assays using group-specific primers and probes designed with this method, have been used to successfully quantify 16S ribosomal Ribonucleic Acid (16S rRNA) gene copy numbers from target methanogenic and ammonia- oxidizing bacteria in various laboratory- and full-scale biologic processes. Researchers with a good command of primer and probe design can use qPCR as a valuable tool to study biodiversity and to develop more efficient control strategies for biologic processes.

关键词: absolute quantification     design guideline     primer     probe     real-time quantitative polymerase chain reaction (qPCR)    

Quantitative analysis of CO

Xianbing LIU, Can WANG

《环境科学与工程前沿(英文)》 2009年 第3卷 第1期   页码 12-19 doi: 10.1007/s11783-009-0011-x

摘要: The increasing volume of CO embodiment in international trade adds a layer of complexity to environmental policies and has raised arguments on the traditional production based responsibility for CO emissions. In order to help understand the quantity of CO embodiment in trade and its policy implications, this paper gives observations to recently emerging literatures that quantitatively discuss CO embodiment in trade. The analytical approaches share the principle of using input and output modeling but vary dramatically in study boundary and estimation accuracy. The calculations can be roughly categorized into three types: direct quantification of CO embodiments in multiregional trade, direct quantification of CO embodiment in bilateral trade, and indirect analysis by comparing the scenarios with or without trade. The practical estimations strongly rely on trade partner selection and data availability. An obvious imbalance of net CO embodiment in the commodity trade between major developed countries and developing economies as a whole was confirmed by these literatures. Carbon taxes and other possible limitations on CO emissions have been addressed. The consistency across the calculations could be enhanced by systematic analyses in more detail to convince the international community to take binding commitments for the reduction of global CO emissions.

关键词: CO2 embodiment     international trade     quantitative estimation     analytical approach    

标题 作者 时间 类型 操作

Lunar In Situ Large-Scale Construction: Quantitative Evaluation of Regolith Solidification Techniques

Charun Bao,Daobo Zhang,Qinyu Wang,Yifei Cui,Peng Feng,

期刊论文

An index system for evaluation of agriculture green development at county level in China

期刊论文

Post-evaluation of a water pollution control plan: methodology and case study

Lin ZENG,Xin DONG,Siyu ZENG,Tianzhu ZHANG,Jing LI,Jining CHEN

期刊论文

基于门控自编码器的驾驶行为量化评价标准化策略

何欣,张哲,许力,俞佳培

期刊论文

Evaluation of the relative risk of stroke in patients with hypertension using cerebrovascular hemodynamic

HUANG Jiuyi, WANG Guiqing, GUO Jiping, CAO Yifeng, WANG Yan, YANG Yongju, YU Xuehai

期刊论文

The defect-length effect in corrosion detection with magnetic method for bridge cables

Qiwei ZHANG, Rongya XIN

期刊论文

A computational toolbox for molecular property prediction based on quantum mechanics and quantitative

期刊论文

蒋宇静:道衬砌定量健康检测评估技术(2019年5月16日)

蒋宇静(院士)

2021年01月20日

会议视频

Erratum to: Using pyrosequencing and quantitative PCR to analyze microbial communities

Husen ZHANG

期刊论文

布达拉宫古建筑的火灾风险分析

庄磊,陆守香,王福亮

期刊论文

Estimation of photolysis half-lives of dyes in a continuous-flow system with the aid of quantitative

Davoud BEIKNEJAD,Mohammad Javad CHAICHI

期刊论文

Application of quantum chemical descriptors into quantitative structure-property relationship models

Yueping BAO, Qiuying HUANG, Wenlong WANG, Jiangjie XU, Fan JIANG, Chenghong FENG

期刊论文

基于定量属性的单目标视觉跟踪算法评价体系研究

Wen-jing KANG, Chang LIU, Gong-liang LIU

期刊论文

Design and use of group-specific primers and probes for real-time quantitative PCR

Juntaek LIM, Seung Gu SHIN, Seungyong LEE, Seokhwan HWANG

期刊论文

Quantitative analysis of CO

Xianbing LIU, Can WANG

期刊论文