检索结果-内蒙古大学图书馆

SSRN 2023年

作者： Chen, Siwen Sun, Gaofei Liu, Shi Zhang, Guoyu Zhang, Jierui Chen, Jiali Key Laboratory of Opto-electronic Measurement and Optical Information Transmission Technology Ministry of Education Department of Instrumentation Science and Technology Changchun University of Science and Technology Changchun130022 China Institute of Aerospace Ground Simulation Test and Testing Technology Changchun University of Science and Technology Changchun130022 China Optical Measurement and Control Instrumentation Jilin Province Engineering Research Center Changchun130022 China

In order to improve the uniform light ability of optical integrator, a design method of variable diameter and off-axis optical integrator was proposed. Firstly, based on the theory of scalar diffraction, the factors affecting the ability of optical integrator to homogenize light were analyzed, and the structure of variable diameter and off-axis optical integrator was designed;Then, the relationship between the aperture and the arrangement of sub-eye lenses is explored by combining semi-definite programming theory and Lagrange-Helmholtz invariant. Finally, the optimal off-axis quantity of different ring strap eye lenses is determined from the perspective of geometric optics by using the aberration theory and following the principle of edge light, so as to achieve the improvement of the optical integrator's uniform light ability. The simulation results show that: On the effective irradiation surface ф26mm of the variable diameter off-axial integrator the irradiation non-uniformity is 2.0%, which decreases by 60% compared with the traditional integrator and reduces the system energy by 45%, which meets the energy utilization requirement of the optical integrator in the solar simulator. The homogenizing ability of optical integrator of solar simulator is improved on the premise that irradiation is not greatly affected and aspheric surface is not introduced. © 2023, The Authors. All rights reserved.

关键词： Irradiation

来源：评论

学校读者我要写书评

暂无评论

Characterizing Nox Emissions from Diesel Trucks with Tampered Aftertreatments and its Implications for Identifying High Emitters

SSRN

引用

SSRN 2023年

作者： Tian, Miao He, Liqiang Peng, Di Fu, Mingliang Ma, Shuai Mu, Jinsong Yu, Quanshun Wang, Jia Yin, Hang Wang, Junfang State Environmental Protection Key Laboratory of Vehicle Emission Control and Simulation Chinese Research Academy of Environmental Sciences Beijing100012 China Xiamen Environment Protection Vehicle Emission Control Technology Center Xiamen361023 China Company Limited Tianjin300300 China Jinan Automobile Testing Center Co Ltd. Jinan250102 China

The discrepancy between real-world and certificated NOx emission levels makes it very crucial for in-use emission surveillance. Therefore, investigating the characteristics of the vehicles which have much higher NOx emissions (i.e., high-emitters) and determining a reasonable cut-off point with a low false detection rate is important. In this study, six diesel trucks were tested under different aftertreatment conditions. The results showed that the discrepancies of fuel-specific NOx emissions between vehicles with functioning and tampered selective catalytic reduction (SCR) occur mainly from medium- to high-speed modes. Furthermore, similar emission factors were derived during the cold-start operation with and without SCRs, indicating the catalytic reduction efficiency of NOx was very low over the cold-start phase. By using binary classification, we selected fuel-specific NOx cut-off points for high-emitters from China V and China VI diesel trucks. The false detection rate of high-emitters can decrease by 33% and 95%, if only NOx emissions from medium- to high-speed modes were used for the chosen cut-off points, respectively. This work highlights the importance of in-use emission compliance programs. It also suggests that high-emitters can be more accurately identified at medium- to high-speed modes if using instantaneous emission data. © 2023, The Authors. All rights reserved.

关键词： Selective catalytic reduction

来源：评论

学校读者我要写书评

暂无评论

Multiscale modeling of thermal properties in Polyurethane incorporated with phase change materials composites: A case study 18

Multiscale modeling of thermal properties in Polyurethane in...

引用

18th Healthy Buildings Europe Conference 2023: Beyond Disciplinary Boundaries

作者： Liu, Bokai Lu, Weizhuo Hu, Xiaoyue Zhang, Chao Wang, Cuixia Qu, Yilin Olofsson, Thomas Department of Applied Physics and Electronics Umeå University Håken Gullessons väg 20 Umeå90187 Sweden Faculty of Architecture and Urbanism Bauhaus-Universität Weimar Weimar99423 Germany Yellow River Laboratory Zhengzhou University Zhengzhou450001 China Institute of Underground Engineering Zhengzhou University Zhengzhou450001 China National Local Joint Engineering Laboratory of Major Infrastructure Testing and Rehabilitation Technology Zhengzhou450001 China Collaborative Innovation Center for Disaster Prevention and Control of Underground Engineering Jointly Built by Provinces and Ministries Zhengzhou450001 China State Key Laboratory for Strength and Vibration of Mechanical Structures Xi’an Jiaotong University Shaanxi Xi’an710049 China

ISBN: (纸本)9781713877158

Polyurethane (PU) is an ideal thermal insulation material due to its excellent thermal properties. The incorporation of Phase Change Materials (PCMs) capsules into Polyurethane (PU) has been shown to be effective in building envelopes. This design can significantly increase the stability of the indoor thermal environment and reduce the fluctuation of indoor air temperature. We develop a multiscale model of a PU-PCM foam composite and study the thermal conductivity of this material. Later, the design of materials can be optimized by obtaining thermal conductivity. We conduct a case study based on the performance of this optimized material to fully consider the thermal comfort of the occupants of a building envelope with the application of PU-PCMs composites in a single room. At the same time, we also predict the energy consumption of this case. All the outcomes show that this design is promising, enabling the passive design of building energy and significantly improving occupants' comfort. © Healthy Buildings Europe 2023. All rights reserved.

关键词： Phase change materials

来源：评论

学校读者我要写书评

暂无评论

Transportation of Chromium(VI) from Hydrochloric Acid Medium via a Dispersion Supported Liquid Membrane Using N235 1

引用

4th International Conference on Sustainable Development of Water and Environment, ICSDWE 2021

作者： Li, Yingxue Zhong, Yijian Wu, Jiaheng Shao, Qingsong Chen, Xiaoyan Zhu, Yan School of Inspection and Testing Certification Changzhou Vocational Institute of Engineering Changzhou Jiangsu203164 China College of Environmental Science and Engineering Guilin University of Technology Guilin541006 China Guangxi Key Laboratory of Theory and Technology for Environmental Pollution Control Guilin University of Technology Guilin541006 China Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area Guilin University of Technology Guilin541006 China

ISBN: (数字)9783030752781

ISBN: (纸本)9783030752774

The permeation of Cr(VI) from acidic media, through a dispersion supported liquid membrane (DSLM), impregnated with tri-n-octylamine (N235) in diluent has been investigated in flat-sheet operational mode. Effects of operational factors including stirring speed, initial Cr(VI) concentration, N235 concentration, NaOH concentration, and the volume ratio of liquid membrane and strip liquor in dispersion phase on Cr(VI) transport have been studied. The evaluation of Cr(VI) separation from hydrochloric acidic media was carried out. Under the optimal condition, the migration rate of 0.01 g/L Cr(VI) was observed as 94%. © 2021, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Liquid membranes

来源：评论

学校读者我要写书评

暂无评论

Magnetic-Gold Nanoparticle-Mediated Paper-Based Biosensor for Highly Sensitive Colorimetric Detection of Food Adulteration

SSRN

引用

SSRN 2024年

作者： Wang, Anyu Chen, Zihan Feng, Xiao He, Guangyun Zhong, Tian Xiao, Ying Yu, Xi Faculty of Medicine Macau University of Science and Technology Avenida Wai Long Taipa China College of Food Science and Engineering Collaborative Innovation Center for Modern Grain Circulation and Safety Key Laboratory of Grains and Oils Quality Control and Processing Nanjing University of Finance and Economics Nanjing China Institute of Quality Standard and Testing Technology for Agro-Products Sichuan Academy of Agricultural Sciences Chengdu610066 China

Food adulteration presents a significant challenge due to the evasion of legal oversight and the difficulty of identification. Addressing this issue, there is an urgent need for on-site, rapid, visually based small-scale equipment, along with large-scale screening technology, to enable prompt results without providing opportunities for dishonest traders to react. Current detection methods primarily utilize PCR for DNA detection, ensuring specificity and accuracy but suffering from long detection time and reliance on large instruments. Colorimetric reactions offer advantages in terms of speed, visualization, and miniaturization. However, there is a scarcity of suitable colorimetric reactions for food adulteration detection, and interference from colored food impurities and easily comparable color results affects accuracy. To overcome limitations, this study introduces a novel approach utilizing polydopamine magnetic nanoparticles to enrich DNA in food samples, effectively eliminating interfering components. By employing gold nanoparticles to generate magnetic-gold nanoparticles, a single magnetic bead achieves simultaneous enrichment, impurity removal, and detection. The use of paper-based biosensors and visualization equipment allows for the visualization and digital analysis of results, achieving a low detection limit of 4.59 nmol mL-1. This innovative colorimetric method addresses the need for rapid, miniaturized, and large-scale detection, thus providing a solution for food adulteration challenges. © 2024, The Authors. All rights reserved.

关键词： Gold nanoparticles

来源：评论

学校读者我要写书评

暂无评论

Precisely controlling Structure Defects Of Quasi-Mil-125 for Improving its Catalytic Performance

SSRN

引用

SSRN 2024年

作者： Hong, Shasha Wang, Peng Li, Erdong Guo, Shang Shanxi Institute for Functional Food Shanxi Agricultural University Shanxi Taiyuan030031 China College of Environmental Science and Engineering Taiyuan University of Technology Shanxi Jinzhong030600 China Shanxi Key Laboratory of Compound Air Pollutions Identification and Control College of Environmental Science and Engineering Taiyuan University of Technology Shanxi Jinzhong030600 China Shanxi Inspection and Testing Center Shanxi Taiyuan030001 China

Quasi-Metal-Organic Frameworks (MOFs) are a class of promising porous materials with unique structural defectives. It is of significant importance to probe into the systematically relationship between catalytic performance of Quasi-MOFs and porous structure, metal nodes and ligands. Herein, a solvent-assisted strategy was developed to finely fabricate Quasi-MIL-125 with various structure defects by varying reaction temperature, where the ligands were removed by controlled esterification to create hierarchical pore and the metal nodes were transformed into TixOy to enrich catalytic active sites. Meanwhile, a morphological transformation of Quasi-MIL-125 was observed from disk-shape to nanosheets during this process. As a result, MIL-125 130 ℃ displayed high catalytic performance in photocatalytic Cr(VI) reduction due to the strong synergistic effect between exposed metal active sites and ligands. What is more, Pd/MIL-125 130 ℃ exhibited significantly enhanced catalytic activity in styrene hydrogenation reaction owing to its enriched porous structure. More importantly, functional Quasi-MOF crystals with different structural defects could be gently fabricated and used to enhance target functions. © 2024, The Authors. All rights reserved.

关键词： Ligands

来源：评论

学校读者我要写书评

暂无评论

A Method for Simulating Abnormal Heating Internal Interface of Composite Insulator Based on Electromagnetic Heating 3

A Method for Simulating Abnormal Heating Internal Interface ...

引用

3rd International Conference on Electrical Materials and Power Equipment, ICEMPE 2021

作者： Li, Ziyue Gao, Chao Lu, Ming Mei, Hongwei Wu, Yansong Wang, Liming Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen China Prevention and Control Technology State Grid Henan Electric Power Research Institute Henan Key Laboratory of Power Transmission Line Galloping Zhengzhou China Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen China

ISBN: (纸本)9781665418409

Decay-like fracture is a new kind of fracture phenomena of composite insulator occurring in recent years. Abnormal temperature rise in 500kV composite insulators high-voltage end is found by the infrared temperature measurement before the decay-like fracture occurs. In order to simulate the overheat conditions and carry out artificial accelerated aging tests, an experimental method based on electromagnetic heating is put forward in the paper. A metal defect is put in the interface between silicone rubber housing and fiber reinforced plastic (FRP) core rod. The composite insulator sample is put in the high frequency magnetic field. Due to the eddy effect, the metal defect will heat. Partial internal heating in the sheath-core interface is achieved in the paper, which is the same as the abnormal overheated composite insulators online. During the experiment, the FPR core rod is heated by the defect, deteriorates, and produces a lot of gas, which cause the damage of the silicone rubber housing. After the experiment, the FPR core rod samples are analyzed by visual observation, scanning electron microscope and Fourier Transform Infrared Spectrometer. It is proved that epoxy resin matrix in the hot environment will be decomposed in the paper. © 2021 IEEE.

关键词： Scanning electron microscopy

来源：评论

学校读者我要写书评

暂无评论

Optimized Power Dispatch for Regional Fatigue Balancing in Offshore Wind Farms

Optimized Power Dispatch for Regional Fatigue Balancing in O...

引用

Chinese Automation Congress (CAC)

作者： Kunwei Lin Xiao-Yu Tang Wenbo Zhao Zhangwei Ling State Key Laboratory of Industrial Control Technology College of Control Science and Engineering Zhejiang University Hangzhou China Zhejiang Academy of Special Equipment Science Hangzhou China Key Laboratory of Special Equipment Safety Testing Technology of Zhejiang Province Hangzhou China

ISBN: (纸本)9781665426480

With the rapid development of offshore wind utilization, how to reduce the high cost of offshore wind farms (WFs) has become a key issue. One way is to reduce the maintenance costs, while the other is to increase the captured wind energy. Herein, a novel strategy of regional fatigue load balance is introduced, and then an offshore wind farm (WF) power dispatch method for regional fatigue balancing is proposed. This strategy aims to increase the captured wind energy as well as reduce the maintenance costs, by striving to decrease the number of outlier wind turbines in the fatigue distribution and then cut down the offshore WFs maintenance frequency. After modelling the offshore WF power generation and fatigue distribution, an optimization problem is established according to the proposed regional fatigue load balance strategy. The particle swarm optimization (PSO) algorithm is adopted to solve the problem of dispatch optimization. A simulation case study with an offshore WF with 49 wind turbines validates the effectiveness of the proposed strategy. In addition, as the comparison of the proposed dispatch strategy, two traditional strategies, the WF maximum power point tracking (MPPT) strategy and the farm-level overall fatigue load balance strategy, are also applied on the simulation case. The results show that the proposed strategy significantly decreases the number of outlier wind turbines in the farm, as well as maintaining the proper power generation.

关键词： Costs Wind energy Production Maintenance engineering Wind power generation Wind farms Fatigue

来源：评论

学校读者我要写书评

暂无评论

Development of a texture evaluation system for winter jujube(Ziziphus jujuba‘Dongzao’)

引用

Journal of Integrative Agriculture 2022年第12期21卷 3658-3668页

作者： KONG Xia-bing XU Min WAN Hao-liang HAN Ling-xi LIU Xiao-li LI Qing-jun HAO Bian-qing ZHANG Shao-jun LI Xiao-ming LIU Yi-hui NIE Ji-yun College of Horticulture Qingdao Agricultural University/Laboratory of Quality&Safety Risk Assessment for Fruit(Qingdao)Ministry of Agriculture and Rural Affairs/National Technology Centre for Whole Process Quality Control of FSEN Horticultural Products(Qingdao)/Qingdao Key Lab of Modern Agriculture Quality and Safety EngineeringQingdao 266109P.R.China Management Service Center of Shandong Binzhou National Agricultural Science and Technology Park Binzhou 256600P.R.China Shanxi Center for Testing of Functional Agro-Products Shanxi Agricultural UniversityTaiyuan 030031P.R.China Institute of Biotechnology and Food Science Hebei Academy of Agriculture and Forestry SciencesShijiazhuang 050051P.R.China

Winter jujube(Ziziphus jujuba‘Dongzao’)is an excellent late maturing variety of fresh-eating jujube in *** texture is an important indicator of sensory *** investigate the correlations among texture indices and establish an evaluation system for winter jujube texture,we used the TMS-Touch instrument to perform a texture profile analysis(TPA)on 1150 winter jujubes from three major producing areas in *** indices and their best-fit distribution were obtained,including fracture(Pearson),hardness(InvGauss),adhesive force(Weibull),adhesiveness(LogLogistic),cohesiveness(LogLogistic),springiness(BetaGeneral),gumminess(InvGauss),and chewiness(InvGauss).Based on the best-fit distribution curves,each index was divided into five grades(lower,low,medium,high and higher)by the 10th,30th,70th and 90th *** the texture indices,82%of the correlation coefficients were highly significant(P<0.01);meanwhile,chewiness was significantly(P<0.01)and positively correlated with springiness and gumminess,of which the correlation coefficients were up to 0.8692 and 0.8096,***,adhesiveness was significantly(P<0.01)and negatively related to adhesive force with a correlation coefficient of–*** hardness,cohesiveness,springiness,gumminess,and chewiness,each index could be well fitted by a multiple linear regression with the remaining four indices,with the coefficients above 0.94 and the mean fitting error and mean prediction error lower than 10%.A comprehensive evaluation model was consequently established based on factor analysis to evaluate the texture quality of winter *** results demonstrated that winter jujube with higher comprehensive scores generally exhibited higher springiness and chewiness,but had lower adhesive force and *** used factor analysis and clustering analysis to divide the eight studied texture into four groups(cohesive factor,adhesive-soft factor,tough-hard factor,and crispness factor),whose represe

关键词： winter jujube texture TPA evaluation representative indices

来源：评论

学校读者我要写书评

暂无评论

G-Quadruplex Dimer-Enhanced Crispr/Cas12a Microfluidic Chip Aptasensor for Rapid, Label-Free Detection of Salmonella Typhimurium

SSRN

引用

SSRN 2025年

作者： Tan, Huimin Man, Yan Du, Yuanfang Yu, Zhou Shi, Cong Ma, Shuai Wang, Yun Tang, Zhenchuang Zhang, Qinghai School of Public Health The key Laboratory of Environmental Pollution Monitoring and Disease Control Guizhou Medical University Guizhou China Institute of Quality Standard and Testing Technology Beijing Academy of Agriculture and Forestry Sciences Beijing China Institute of Chinese Materia Medica China Academy of Chinese Medical Sciences Beijing China Institute of Food and Nutrition Development Ministry of Agriculture and Rural Affairs Beijing China

This study presents an innovative microfluidic chip-based fluorescent aptasensor that combines G-quadruplex (G4) dimer enhancement with CRISPR/Cas12a technology for rapid, label-free detection of S. typhimurium. The system features a novel design incorporating self-assembled, replaceable reagent pre-stored tubes and an automated micromixing module with diamond-shaped microcolumns arranged in a "contraction-expansion" channel configuration. This design eliminates the need for complex microvalves while enabling efficient multi-step reactions. Our G4 dimer-enhanced microfluidic CRISPR/Cas12a aptasensor achieved remarkable performance metrics, including a broad linear detection range (3.6×10¹ to 3.6×10⁶ CFU/mL) and a low detection limit of 36 CFU/mL. The sensor demonstrated excellent specificity for S. typhimurium and proved highly effective in analyzing spiked food samples, including milk, pre-cut vegetables, and chicken, with recovery rates of 88.11-105.19%. The integration of G4 dimer enhancement significantly improved both the signal-to-noise ratio and detection accuracy. This innovative platform represents a significant advancement in automated, rapid, and highly sensitive detection methods for foodborne pathogens in food safety applications. © 2025, The Authors. All rights reserved.

关键词： Salmonella

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：