检索结果-南通市图书馆

Improvement of Renewable Bioenergy Production in Microbial Fuel Cells with Saponin Supplementation

Journal of Sustainable Bioenergy Systems 2021年第2期11卷 82-93页

作者： Skylar Choi Yongjin Park Immanuel H. Anaborne jin Sik Song ji woo han So Hyun Jeon Jaewoo Kim James Kim jinkwon Lee Paul S. Chung Horace Greeley High School Chappaqua NY USA Deerfield Academy Deerfield MA USA Oakton High School Vienna VA USA School of Arts & Sciences University of Virginia Charlottesville VA USA School of Arts & Sciences Emory University Atlanta GA USA Bachelor of Science Villanova University Villanova PA USA College of Letters & Sciences University of California Los Angeles Los Angeles CA USA School of Arts & Sciences University of Michigan Ann Arbor MI USA Division of Biological Sciences Revelle College University of California San Diego CA USA Fuzbien Technology Institute Rockville MD USA

Microbial fuel cell (MFC) is one of renewable biofuel production technology that directly converts biomass to electricity. Cellulosic biomass is particularly attractive renewable resources for its low cost and abundance and neutral carbon balance. However, methanogenesis remains as a major factor limiting MFC performance. The current study reports that saponin addition at 0.05% w/v dose to anolyte in MFCs inhibited methanogenesis and improves power generation and cellulose fermentation. Mediator-less two chamber H-type MFCs were prepared using rumen fluid as anode inocula at 20% v/v of anolyte to convert finely ground pine tree (Avicel) at 2%, w/v to electricity. Saponin was added to the anode of MFC at 0.005% or 0.05% v/v dosage for treatment. MFC power and current across an external resistor were measured daily for 10d. On d10, collected gases from anode compartment were measured for total gas volume and analyzed for gas composition on gas chromatography. Supplementation of saponin to MFC at 0.005% did not have any effects on electricity generation or biogas production and composition. Saponin at 0.05% dose reduced 10% of methane prod

关键词： Microbial Fuel Cells Saponin Bioenergy

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Common Methods of Contraception Used at Monkey Bay Community Hospital in Mangochi District, Malawi

引用

Advances in Infectious Diseases 2021年第1期11卷 13-20页

作者： David S. Chung Peter S. Park Sohyun Jeon Sue Min Shin ji woo han Chaieun Lee Andrew Mun William Mun Yun Jae Shin Lorie Kim Jairos B. Makangano Fatsani Manase Thomas Nyirenda School of Medicine University of Virginia Charlottesville VA USA Youth with Talents Fairfax VA USA Perelman School of Medicine University of Pennsylvania Philadelphia PA USA Clinical Research Education and Management Service Lilongwe Malawi

To determine commonly used methods of contraception at Monkey Bay Community hospital, to compare different methods of contraception used by people of various age groups, parity, Human Immunodeficiency Virus (HIV) and Marital status, a clinical audit of family planning methods used by clients at Monkey Community hospital from January 2018 to June 2019 was done. Data was collected from the registers. A total number of 1734 clients reported at family planning clinic of Monkey-Bay Community Hospital between January 2018 and June 2019. All the clients were females. Most of these clients were in the age range of 15 - 34 years (83.33%). There were 1,486 (87%) HIV negative clients, 208 (12%) HIV positive clients and 24 (1%) had unknown HIV status. Most clients had a parity of 1 - 2 (905, 52.71%) followed by 3 - 4 (540, 31.45%) and 5 or plus (272, 15.84%). There were more married people (1641, 97.23%) than unmarried ones (46, 2.73%). There was only one person who was divorced (1, 0.05%). Education status was not recorded. The five commonly used contraceptive methods were: Intramuscular (IM) injectable Depo-IM (1366, 79.51%), Jadelle (122, 7.10%), Subcutaneous (SC) injectable Depo-SC (65, 3.78%), Combined Oral Contraceptives (COC) (60, 3.49%) and Implanon (40, 2.33%). None of the clients was used female condoms as a method of contraception. The contraceptive use was common between the age group of 15 - 24 (707, 44.92%) and 25 - 34 (709, 45%). Depo-IM was most used in age group 25 - 34 (44.5%) while Jadelle was mostly used by 15 - 24 years old (48%). 1181 clients (79.5%) of HIV negative clients used Depo-IM as the contraceptive method while 164 clients (78.8%) of HIV positive clients used Depo IM as a method of contraception. More HIV negative clients used Jadelle and COC as compared to HIV positive clients. The choice of a particular method of contraception was influenced by many factors. Parity, marital status, age as well as HIV status did have some association with the pre

关键词： Contraception Parity HIV Mangochi Malawi

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Feasibility Study of R134a/R404a Cascade Heat Pump Cycle in Heat Pump Dryers with Electrical Heaters at Low Temperatures

引用

Journal of Thermal Science 2015年第5期24卷 463-467页

作者： ji woo Jeong Young Lim Lee Dept. of Mechanical Engineering Kongju National University Dept. of Mechanical and Automotive Engineering Kongju National University

Heat pump cycles have been widely applied to dryers for their high efficiency. However, low–efficiency electrical heaters are often used during early drying stage for frozen foods or winter since a standard heat pump cycle cannot operate at low temperature. This study introduced cascade heat pumps replacing electrical heaters to improve dryer performance at low temperatures. Experiments were performed to examine changes in performance of the cascade heat pump dryers in relation to ambient temperature, low-stage cycle mass flow rate, and high-stage cycle mass flow rate. The results showed a significant improvement in low-temperature dryer performance with the introduction of cascade heat pump cycles.

关键词： Cascade cycle R134a/R404a Heat pump dryer COP Energy efficiency

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Organic solar cells for indoor power generation

引用

Science China Chemistry 2020年第1期63卷 1-2页

作者： Hwa Sook Ryu han Young woo Department of Chemistry College of Science Korea University

During last decades,organic solar cells(OSCs)have achieved remarkable advancements via extensive studies on the optimization of photovoltaic donor/acceptor(D/A)materials,device fabrication,and the D/A bulk heterojunction *** conversion efficiencies(PCEs)up to〜16%for single junction cells and over 17%PCEs were successfully demonstrated for tandem OSC devices[1,2].OSCs may find real industrial applications soon,including building integrated photovoltaics,portable power sources and indoor power generation for low power consumption electronic devices(i.e.,internet of things(IOT)sensors).Among them,indoor applications have great potentials because OSCs can convert indoor lights into electricity more efficiently compared to inorganic counterparts[3].

关键词： D/A power portable

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

TWO-STEP SCHEME FOR BACKWARD STOCHASTIC DIFFERENTIAL EQUATIONS

引用

Journal of Computational Mathematics 2023年第2期41卷 287-304页

作者： Qiang han Shaolin ji Zhongtai Securities Institute for Financial Studies Shandong UniversityJinan 250100China

In this paper,a stochastic linear two-step scheme has been presented to approximate backward stochastic differential equations(BSDEs).A necessary and sufficient condition is given to judge the L 2-stability of our numerical *** stochastic linear two-step method possesses a family of 3-order convergence schemes in the sense of strong *** coefficients in the numerical methods are inferred based on the constraints of strong stability and n-order accuracy(n∈N^(+)).Numerical experiments illustrate that the scheme is an efficient probabilistic numerical method.

关键词： Backward stochastic differential equation Stochastic linear two-step scheme Local truncation error Stability and convergence

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Failure modes of lattice sandwich plate by additive-manufacturing and its imperfection sensitivity

引用

Acta Mechanica Sinica 2020年第2期36卷 430-447页

作者： Bin ji han han Renbang Lin Hao Li Shanghai Key Laboratory of Spacecraft Mechanism Shanghai 201109China Aerospace System Engineering Shanghai Shanghai 201109China

Additive-manufacturing process has substantially promoted the development of lattice structure and makes it possible to fabricate complex lattice sandwich ***-plane compression load always appears in engineering,such as in the primary structure of *** order to reveal potential engineering application in future,this paper focuses on the lattice sandwich plate that is fabricated by additive-manufacturing and subjected to in-plane ***,five failure modes are proposed for lattice sandwich plate under in-plane compression,including Euler buckling,shear buckling,face sheet dimpling,face sheet wrinkling and face sheet ***,an optimization method is proposed to obtain the optimum sizes,including the panel thickness,the length of rod,the size of rod cross-section,the inclined angle of rod and the wideness ratio of ***,the in-plane compression experiment is operated after measuring the geometrical imperfection of the specimen by the optical *** method is adopted to illustrate the effect on failure behaviors caused by the imperfections of struts,face sheets and global *** introducing these imperfection,numerical result can be well agreed with experimental result and explain the failure mechanisms mostly derived from the radius imperfection for the struts.

关键词： Additive-manufacturing Lattice structure In-plane compression Failure mode Imperfection sensitivity

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Measurement of stiffness and damping coefficient of rubber tractor tires using dynamic cleat test based on point contact model

引用

International Journal of Agricultural and Biological Engineering 2021年第1期14卷 157-164页

作者： Hogil Yoo Jooseon Oh woo-jin Chung Hyun-woo han ji-Tae Kim Young-Jun Park Yoonna Park Department of Biosystems&Biomaterials Science and Engineering Seoul National UniversitySeoul 08826Republic of Korea Global Smart Farm Convergence Major College of Agriculture and Life SciencesSeoul National UniversitySeoul 08826Republic of Korea Research Institute of Agriculture and Life Sciences College of Agriculture and Life SciencesSeoul National UniversitySeoul 08826Republic of Korea Research and Development Institute Tongyang Moolsan Co.Ltd.Gongju 32530Republic of Korea

The ride vibration of a tractor is affected mostly by the stiffness and damping coefficient of the seat suspension,cabin suspension,cabin rubber mounts,and rubber ***,in the case of rubber tractor tires,the stiffnesses and damping coefficients have not been researched adequately thus far,and it is not simple to measure these *** this study,a method for measuring and analyzing the stiffnesses and damping coefficients of rubber tractor tires,which were the input parameters for the tractor ride vibration simulation,was *** cleat test,proposed in this study,did not require separate and complicated test equipment,unlike the conventional *** test was conducted simply by measuring acceleration under the driving conditions of the vehicle without detaching tires from the vehicle body or setting up additional test *** on the ground-vertical acceleration data obtained,the stiffness was calculated using the logarithmic decrement method,and the damping coefficient was calculated using least squares exponential curve *** result of the cleat test indicated that the front tires had stiffnesses of 486.08-570.69 kN/m and damping coefficients of 4.02-4.52 kN·s/m;the rear tires had stiffnesses of 409.42-483.79 kN/m and damping coefficients of 2.21-2.67 kN·s/*** the test,40 mm height cleats were installed on the track and the speed of the tractor was set to 7 and 10 km/h,which were the most common speeds during the *** study is meaningful in that it has presented a new method that improves the practicality of results,reduces cost,and simplifies the test process for measuring the stiffnesses and damping coefficients of rubber tractor tires.

关键词： ride vibration rubber tractor tire stiffness damping coefficient cleat test point contact model

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Geometry and Hardy spaces on spaces of homogeneous type in the sense of Coifman and Weiss

引用

Science China Mathematics 2017年第11期60卷 2199-2218页

作者： han YanChang han YongSheng LI ji School of Mathematical Sciences South China Normal University Department of Mathematics Auburn University Department of Mathematics Macquarie University

It is known that the space of homogeneous type introduced by Coifman and Weiss(1971) provides a very natural setting for establishing a theory of Hardy spaces. This paper concentrates on how the geometrical conditions of the space of homogeneous type play a crucial role in building a theory of Hardy spaces via the Littlewood-Paley functions.

关键词： spaces of homogeneous type Hardy space singular integrals Carleson measure space BMO

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

COVID-19 Detection via a 6-Layer Deep Convolutional Neural Network

引用

Computer Modeling in Engineering & Sciences 2022年第2期130卷 855-869页

作者： Shouming Hou ji han School of Computer Science and Technology Henan Polytechnic UniversityJiaozuo454000China

Many people around the world have lost their lives due to *** symptoms of most COVID-19 patients are fever,tiredness and dry cough,and the disease can easily spread to those around *** the infected people can be detected early,this will help local authorities control the speed of the virus,and the infected can also be treated in *** proposed a six-layer convolutional neural network combined with max pooling,batch normalization and Adam algorithm to improve the detection effect of COVID-19 *** the 10-fold cross-validation methods,our method is superior to several state-of-the-art *** addition,we use Grad-CAM technology to realize heat map visualization to observe the process of model training and detection.

关键词： COVID-19 deep learning convolutional neural network max pooling batch normalization Adam Grad-CAM

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Alternative industrial carbon emissions benchmark based on input-output analysis

引用

Frontiers of Earth Science 2016年第4期10卷 731-739页

作者： Mengyao han Xi ji Institute of Geographic Sciences and Natural Resources Research Chineses Academy of Sciences Beijing 100871 China College of Engineering Peking University Beijing 100871 China School of Economics Peking University Beijing 100871 China

Some problems exist in the current carbon emissions benchmark setting systems. The primary con- sideration for industrial carbon emissions standards highly relate to direct carbon emissions （power-related emissions） and only a portion of indirect emissions are considered in the current carbon emissions accounting processes. This practice is insufficient and may cause double counting to some extent due to mixed emission sources. To better integrate and quantify direct and indirect carbon emissions, an embodied industrial carbon emissions benchmark setting method is proposed to guide the establishment of carbon emissions benchmarks based on input-output analysis. This method attempts to link direct carbon emissions with inter-industrial economic exchanges and systematically quantifies carbon emissions embodied in total product delivery chains. The purpose of this study is to design a practical new set of embodied intensity-based benchmarks for both direct and indirect carbon emissions. Beijing, at the first level of carbon emissions trading pilot schemes in China, plays a significant role in the establish- ment of these schemes and is chosen as an example in this study. The newly proposed method tends to relate emissions directly to each responsibility in a practical way through the measurement of complex production and supply chains and reduce carbon emissions from their original sources. This method is expected to be developed under uncertain internal and external contexts and is further expected to be generalized to guide the establish- ment of industrial benchmarks for carbon emissions trading schemes in China and other countries.

关键词： emissions trading scheme benchmarking,carbon emissions input-output analysis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

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：