检索结果-内蒙古大学图书馆

Comparison of solid-state anaerobic digestion to composting of yard trimmings with effluent from liquid anaerobic digestion: Effect of total solids content and feedstock to effluent ratio

Comparison of solid-state anaerobic digestion to composting ...

引用

American Society of Agricultural and Biological Engineers Annual International Meeting 2014, ASABE 2014

作者： Lin, Long Yang, Liangcheng Xu, Fuqing Michel, Frederick C. Li, Yebo Department of Food Agricultural and Biological Engineering Ohio State University Ohio Agricultural Research and Development Center 1680 Madison Ave. WoosterOH44691 United States Environmental Science Graduate Program Ohio State University WoosterOH United States

ISBN: (纸本)9781632668455

Solid-state anaerobic digestion (SS-AD) and composting of yard trimmings with effluent from liquid anaerobic digestion were compared at a range of total solids (TS) contents and feedstock to effluent (F/E) ratios under thermophilic condition. For SS-AD, TS contents of 22%, 25%, and 30% were studied, while for composting TS contents of 35%, 45%, and 55% were sued. Experiments were conducted at various feedstock to effluent (F/E) ratios including 2, 3, 4, 5, and 6. High TS content negatively affected degradation rates as indicated by low biogas and carbon dioxide yields for SS-AD and composting, respectively. In composting, the greatest carbon loss was obtained at 35% TS, which was 2-3 times of that at 55% TS and was up to 50% higher than that in SS-AD. In SS-AD, over half of the degraded carbon was converted to methane with the greatest methane yield of 121 L/kg VSfeedstock obtained at 22% TS. Methane production from SS-AD was low at low F/E ratios (i.e. 2 and 3), likely due to inhibitory effects of high concentrations of ammonia nitrogen (up to 5.6 g/kg N). Nitrogen-rich (N, P, K) end products with similar N-P-K values but different dominant forms of nitrogen were generated from SS-AD and composting.

关键词： Biogas

来源：评论

学校读者我要写书评

暂无评论

From the Field: Neck lesions in ungulates from collars incorporating satellite technology

引用

Wildlife Society Bulletin 2019年第3期32卷

作者： Paul R. Krausman Vernon C. Bleich James W. Cain III Thomas R. Stephenson Don W. DeYoung Philip W. McGrath Pamela K. Swift Becky M. Pierce Brian D. Jansen California Department of Fish and Game 407 West Live Street Bishop CA 93514 USA University Animal Care The University of Arizona Tucson AZ 85721 USA. James W. Cain III(top second from left) is a graduate research assistant working towards his Ph.D. in wildlife ecology at the University of Arizona Tucson. He is studying the habitat relationships of desert bighorn sheep in Cabeza Prieta National Wildlife Refuge Arizona. He received his B.S. degree in biology from Colorado State University in 1997 and an M.S. degree in Biological conservation from California State University Sacramento in 2001. Don W. DeYoung(top third from left) received his D.V.M. from Michigan State University and Ph.D. from Colorado State University. He is a Diplomate from the American College of Veterinary Surgeons. Don has worked at the University of Arizona Tucson since 1979 and is the Associate Director of University Animal Care and has been involved with numerous studies of wildlife. Brian D. Jansen(top right) is a graduate research assistant working towards his M.S. degree in wildlife ecology at the University of Arizona Tucson. He is studying desert bighorn sheep responses to disease and mining in the Silver Bell Mountains Arizona. He received his B.S. in wildlife from the University of Arizona in 2002. Vernon C. Bleich(bottom left) received B.S. and M.A. degrees from California State University Long Beach and a Ph.D. from the University of Alaska Fairbanks (UAF). He is a senior environmental scientist with the California Department of Fish and Game (CDFG) where he supervises the Sierra Nevada Bighorn Sheep Recovery Program (SNBSRP) and directs the Round Valley Project a long-term effort examining relationships between habitat quality prey densities and populations of mule deer and mountain sheep in the eastern Sierra Nevada. He has been a Professional Member of the Boone and Crockett Club since 1999 and in 2002 received the Outstanding Alumnus Award from the College of Science Engineering and Mathematics at UA

来源：评论

学校读者我要写书评

暂无评论

An ergonomic study for 6s workplace improvement

An ergonomic study for 6s workplace improvement

引用

IIE Annual Conference and Expo 2014

作者： Aqlan, Faisal Lam, Sarah S. Ramakrishnan, Sreekanth Testani, Michael Industrial and System Engineering Program Department of Mechanical Civil and Environmental Engineering University of New Haven West HavenCT06516 United States Department of Systems Science and Industrial Engineering State University of New York at Binghamton BinghamtonNY13902 United States IBM Corporation WalthamMA02451 United States IBM Corporation EndicottNY13760 United States

ISBN: (纸本)9780983762430

This paper presents a workplace ergonomic study in a high-end server manufacturing environment to assess ergonomics risks and enhance the Lean transformation. Operators perform heavy and repetitive lifting and movement of products could place stress on their back and upper extremities. Forceful exertions to move a manual forklift in the workplace area could lead to fatigue and possible damage to muscles and other tissues. The objective of this study is to reduce ergonomics risks to an acceptable level and provide operators with the right tools and proper work environment. Digital human modeling based on the Jack software, is used for risk assessment. Results are analyzed to provide proper solutions. Ergonomic risks assessed include: force and posture risks, noise, vibration, temperature, and illumination. Lean process is implemented in the workplace to reduce the Lean wastes that include waiting time, transportation, and non-value-add processes. Ergonomic improvements are introduced to complement and support the Lean process implementation. Three main ergonomic risks are found to be high and could affect the operators: energy expenditure, posture, and back force. Several modifications are implemented to reduce these risks: the manual forklift is replaced with an automated forklift that is easy to move and requires less human effort, the workplace area is expanded to provide more work space, and the operators are provided with proper tools to perform the task without risk.

关键词： Manufacture

来源：评论

学校读者我要写书评

暂无评论

Integrating lean and ergonomics to improve internal transportation in a manufacturing environment

Integrating lean and ergonomics to improve internal transpor...

引用

IIE Annual Conference and Expo 2014

作者： Aqlan, Faisal Lam, Sarah S. Ramakrishnan, Sreekanth Boldrin, Warren Industrial and System Engineering Program Department of Mechanical Civil and Environmental Engineering University of New Haven West HavenCT06516 United States Department Systems Science and Industrial Engineering State University of New York at Binghamton BinghamtonNY13902 United States IBM Corporation WalthamMA02451 United States IBM Corporation PoughkeepsieNY12601 United States

ISBN: (纸本)9780983762430

This paper presents a study that integrates lean manufacturing and ergonomic principles to redesign and improve the internal transportation process in a high-end server manufacturing environment. Transportation of electronic parts within the factories is an important issue. The current transportation carts present quality hazards to electronic parts and they were not designed to handle the right dimensions and quantities of the newly introduced products. Furthermore, the current flow of carts introduces waiting time for the carts in the assembly areas. Inefficient transportation not only increases the waiting times but also the transportation costs. The objective of this study is to improve the transportation process and redesign transportation carts that are currently used to transport parts between different areas in a high-end server manufacturing environment utilizing lean and ergonomic principles. A new lean-based flow of transportation carts is proposed to reduce the waiting time and transported distance by having separate carts for each area. The new design of the carts represents a Poke-Yoke that prevents the operators from stacking the cards. Ergonomic principles are also considered in the new design. The number of carts required is estimated based on historical demand, outcomes from containment actions, current processes, and inputs from the production-planning department. The new lean-based flow and design of carts have resulted in cost savings and cost avoidance.

关键词： Lean production

来源：评论

学校读者我要写书评

暂无评论

Development of empirical correlation of peak friction angle with surface roughness of discontinuities using tilt test

引用

AIP Conference Proceedings 2016年第1期1784卷

作者： Ailie Sofyiana Serasa Goh Thian Lai Abdul Ghani Rafek Norbert Simon Azimah Hussein Lee Khai Ern Noraini Surip Tuan Rusli Mohamed 1Geology Program School of Environmental and Natural Resource Sciences Faculty of Science and Technology Universiti Kebangsaan Malaysia 43600 Bangi Selangor Darul Ehsan Malaysia 2Chemical and Petroleum Engineering Department Faculty of Engineering Technology and Built Environment (FETBE) UCSI University 56000 Cheras Kuala Lumpur Malaysia 3Department of Geosciences Universiti Teknologi PETRONAS Bandar Seri Iskandar 31750 Tronoh Perak Darul Ridzuan Malaysia 4Institute for Environment and Development (LESTARI) Universiti Kebangsaan Malaysia 43600 Bangi Selangor Darul Ehsan Malaysia 5Minerals and Geoscience Department Malaysia Jalan Sultan Azlan Shah 31400 Ipoh Perak Malaysia

The significant influence of surface roughness of discontinuity surfaces is a quantity that is fundamental to the understanding of shear strength of geological discontinuities. This is due to reason that the shear strength of geological discontinuities greatly influenced the mechanical behavior of a rock mass especially in stability evaluation of tunnel, foundation, and natural slopes. In evaluating the stability of these structures, the study of peak friction angle (Φpeak) of rough discontinuity surfaces has become more prominent seeing that the shear strength is a pivotal factor causing failures. The measurement of peak friction angle however, requires an extensive series of laboratory tests which are both time and cost demanding. With that in mind, this publication presents an approach in the form of an experimentally determined polynomial equation to estimate peak friction angle of limestone discontinuity surfaces by measuring the Joint Roughness Coefficient (JRC) values from tilt tests, and applying the fore mentioned empirical correlation. A total of 1967 tilt tests and JRC measurements were conducted in the laboratory to determine the peak friction angles of rough limestone discontinuity surfaces. A polynomial equation of ɸpeak = −0.0635JRC2 + 3.95JRC + 25.2 that exhibited 0.99 coefficient of determination (R2) were obtained from the correlation of JRC and peak friction angles. The proposed correlation offers a practical method for estimation of peak friction angles of rough discontinuity surfaces of limestone from measurement of JRC in the field.

关键词：

来源：评论

学校读者我要写书评

暂无评论

The AgMIP potato model intercomparison pilot - First responses 1

The AgMIP potato model intercomparison pilot - First respons...

引用

ASABE 1st Climate Change Symposium: Adaptation and Mitigation

作者： Fleisher, D.H. Condon, B. Quiroz, R. Alva, A. Asseng, S. Bindi, M. Brown, H. Ferrise, R. Franke, L. Govindakrishnan, P.M. Harahagazwe, D. Haverkort, A. Hoogenboom, G. Naresh Kumar, S. Merante, P. Nendel, C. Olesen, J.E. Parker, P.S. Raes, D. Raymundo, R. Ruane, A. Searle, B. Stockle, C. Supit, I. Vanuytrecht, E. Wolf, J. Woli, P. USDA-ARS Crop Systems and Global Change BeltsvilleMD United States International Potato Center Lima Peru USDA-ARS Agricultural Systems Unit SidneyMD United States University of Florida Agricultural and Biological Engineering Department GainesvilleFL United States University of Florence Department of Agrifood Production and Environmental Sciences Florence Italy New Zealand Institute for Plant and Food Research Limited Christchurch New Zealand Wageningen University Plant Production Systems Wageningen Netherlands Central Potato Research Institute Shimla India International Potato Center Crop Ecophysiology and Modelling CIP SSA Nairobi Kenya Washington State University Ag Weather Net Program ProsserWA United States Central Plantation Crops Research Institute Kerala India Leibniz Centre for Agricultural Landscape Research Institute of Landscape Systems Analysis Brandenburg Germany Aarhus University Department of Agroecology and Environment Tiele Denmark KU Leuven University Department of Earth and Environmental Sciences Leuven Belgium NASA Goddard Institute for Space Studies wd New YorkNY United States Washington State University Biological Systems Engineering PullmanWA United States Wageningen University Earth System Science and Climate Adaptive Land Management Wageningen Netherlands

来源：评论

学校读者我要写书评

暂无评论

Synthesis of silver and gold nanoparticles using antioxidants from blackberry, blueberry, pomegranate, and turmeric extracts

Synthesis of silver and gold nanoparticles using antioxidant...

引用

作者： Nadagouda, Mallikarjuna N. Iyanna, Nidhi Lalley, Jacob Han, Changseok Dionysiou, Dionysios D. Varma, Rajender S. ORD NRMRL U.S. Environmental Protection Agency Cincinnati OH 45268 United States William Mason High School Mason OH 45040 United States Environmental Engineering and Science Program University of Cincinnati Cincinnati OH 45221-0012 United States Sustainable Technology Division National Risk Management Research Laboratory U.S. Environmental Protection Agency 26 West Martin Luther King Drive Cincinnati OH 45268 United States

Greener synthesis of Ag and Au nanoparticles is described using antioxidants from blackberry, blueberry, pomegranate, and turmeric extracts. The synthesized particles were characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution TEM (HR-TEM), particle size analysis, UV-vis spectroscopy, and thermogravimetric analysis. The XRD patterns indicated the formation of Ag and Au nanoparticles, and the results are in line with UV plasma resonance peaks. © 2014 American Chemical Society.

关键词： X ray diffraction

来源：评论

学校读者我要写书评

暂无评论

Analytical and experimental studies on human body communication between wristwatch and handheld devices using muscle homogenous phantom at 10 MHz

Analytical and experimental studies on human body communicat...

引用

作者： Muramatsu, Dairoku Koshiji, Fukuro Koshiji, Kohji Sasaki, Ken Department of Human and Engineered Environmental Studies Graduate School of Frontier Science University of Tokyo 5-1-5 Kashiwano-ha Kashiwa-shi Chiba277-8563 Japan Program in Electrical Engineering Graduate School of Engineering Kokushikan University 4-28-1 Setagaya Setagaya-ku Tokyo154-8515 Japan Department of Electrical Engineering Graduate School of Science and Technology Tokyo University of Science 2641 Yamazaki Noda-shi Chiba278-8510 Japan

In human body communication, it is important to investigate the input impedance characteristics of electrodes and transmission characteristics between transceivers for improving the qualities of communication and reducing power consumption. In this work, we studied the input impedance characteristics and transmission characteristics between a wristwatch device and a handheld device using both a three-dimensional electromagnetic field simulation and experiment at 10 MHz. The input impedance and transmission characteristics obtained from the simulation using a muscle homogenous model and those obtained from the measurement using a muscle-tissue-equivalent phantom showed good consistency. The calculated electric field around a human arm decreased as it moved away from the surface of the arm. This distribution of the electric field showed the advantages of human body communication, which are confidential communication and electromagnetic compatibility (EMC). Moreover, power consumption at the feeding point of the system was calculated from the transmission characteristics obtained from the simulation. This result indicated that human body communication achieves low-power consumption.

关键词： Electrodes

来源：评论

学校读者我要写书评

暂无评论

Using the transportation performance index to understand the impact of regional plans 2

Using the transportation performance index to understand the...

引用

2nd Transportation and Development Institute Congress - Planes, Trains, and Automobiles: Connections to Future Developments, T and DI 2014

作者： McNeil, Sue Atique, Farzana Burke, Ryan Trimbath, Susanne Dept. of Civil and Environmental Engineering Univ. of Delaware NewarkDE19716 United States Disaster Science and Management Program Univ. of Delaware NewarkDE19716 United States STP Advisory Services LLC PO Box 1252 BellevueNE68005 United States

ISBN: (纸本)9780784413586

The Transportation Performance Index (TPI) provides a snapshot of the performance of transportation infrastructure in a specific year based on indicators reflecting supply, quality of service and utilization. To better understand how the TPI changes with investment, regional long range transportation plans were reviewed and the impact of the proposed investments estimated for 2035. Without investment, the performance of transportation infrastructure, as measured by the TPI, declines significantly from 2011. With investment the TPI is shown to increase significantly, underscoring the importance of these strategic investments. © 2014 American Society of Civil Engineers.

关键词： Investments

来源：评论

学校读者我要写书评

暂无评论

Bio-inspired impact-resistant composites

Bio-inspired impact-resistant composites

引用

作者： Grunenfelder, L.K. Suksangpanya, N. Salinas, C. Milliron, G. Yaraghi, N. Herrera, S. Evans-Lutterodt, K. Nutt, S.R. Zavattieri, P. Kisailus, D. Department of Chemical and Environmental Engineering Bourns Hall B357 University of California Riverside Riverside CA 92521 United States School of Civil Engineering Purdue University West Lafayette IN 47907 United States Materials Science and Engineering Program University of California Riverside Riverside CA 92521 United States National Synchrotron Light Source Brookhaven National Laboratory Upton NY 11973 United States Department of Chemical Engineering and Materials Science University of Southern California Los Angeles CA 90089 United States

Through evolutionary processes, biological composites have been optimized to fulfil specific functions. This optimization is exemplified in the mineralized dactyl club of the smashing predator stomatopod (specifically, Odontodactylus scyllarus). This crustacean's club has been designed to withstand the thousands of high-velocity blows that it delivers to its prey. The endocuticle of this multiregional structure is characterized by a helicoidal arrangement of mineralized fiber layers, an architecture which results in impact resistance and energy absorbance. Here, we apply the helicoidal design strategy observed in the stomatopod club to the fabrication of high-performance carbon fiber-epoxy composites. Through experimental and computational methods, a helicoidal architecture is shown to reduce through-thickness damage propagation in a composite panel during an impact event and result in an increase in toughness. These findings have implications in the design of composite parts for aerospace, automotive and armor applications. © 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

关键词： Biomimetics

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：