检索结果-南通市图书馆

“H_(2)-free” demethoxy.ation of guaiacol in subcritical water using Pt supported on N-doped carbon cataly.ts:A cost-effective strategy.for biomass upgrading

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

j.urnal of Energy.Chemistry 2021年第7期30卷 377-385页

作者： Laura Pastor-Pérez Wei j.n j.an j.Villora-picó Qiang Wang M.Mercedes Pastor-Blas Antonio Sepúlveda-Escribano Tomas R.Reina Department of Chemical and Process Engineering University of SurreyGuildford GU27XHUnited Kingdom Laboratorio de Materiales Avanzados Departamento de Química Inorgánica-Instituto Universitario de Materiales de AlicanteUniversidad de AlicanteApartado 99E-03080 AlicanteSpain College of Environmental Science and Engineering Beijing Forestry UniversityBeijing 100083China

"H_(2)-free" HDO is a revolutionary.route to circumvent the limitations of H_(2)-fed HDO reactors for biomass *** work demonstrates the viability.of this economically.appealing route when an adequate cataly.t is ***,we have developed a new family.of Pt cataly.ts supported on N-doped activated carbons for the H_(2)-free HDO process of *** N-donors have been used to tune the cataly.t’s structural and electronic *** a general trend,the N-promoted samples are more selective towards oxy.en-depleted *** best performing material,namely.Pt/PANI-AC reached outstanding guaiacol conversion values-ca.75% at 300℃ while display.ng reasonable stability.for multiple recy.ling *** advanced performance is ascribed to the modified electronic and acid-base properties which favor guaiacol activation and C-O cleavage,as well as the excellent dispersion of the Pt nano particles.

关键词： Biomass upgrading N-doped carbon Pt HDO Guaiacol H_(2)-free

The Design and Development of a Multi-Lingual Braille Sy.tem Output Device with Audio Enhancement

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

j.urnal of Software Engineering and Applications 2013年第5期6卷 289-295页

作者： Michel j. Oway.an Taimour Z. Wehbe Elie y. Bou Daher Omran A. Ay.ub Department of Computer and Communications Engineering American University of Science & Technology Beirut Lebanon

Visually.impaired people face difficulties in interacting and gaining full advantage of computers. Recently. and with the fast evolution in technology. researchers proposed to give the blinds the ability.to take advantage of these advancements. Accordingly. designers and engineers started working on proj.cts that relate input and output devices to the computers in order for the blind individual to have full control of the hi-tech machines. However, investments in these kinds of hardware presented complexity.in the design, in addition to the high cost imposed by.the devices used. The proj.ct’s obj.ctive is to design and develop a Multi-Lingual Braille Sy.tem Output Device for the visually.impaired individuals that enable them to access and read texts from a computer. The device acquires both English or Arabic texts and display. them using controlled piezoelectric Braille cells. It also has the ability.to produce a sound that matches the display.d characters. The control of the cells is done via Programmable Interface Controller (pic) microcontroller. The interaction between the device and the computer is done through the Universal Serial Bus (USB). C# is the language used to write the program responsible for controlling this interaction. The continuous development of such devices is essential for the visually.impaired to keep up with the technological advancements. The main advantages of this sy.tem are its low cost, the added multi-lingual, and the audio features. In addition, many.features can be added so as to satisfy.the users’ needs, such as adding new languages and Grade 2 Braille Sy.tem.

关键词： Assistive Technologies Braille Devices Computer Peripheral Parts Low-Vision Aiding Sy.tems Rehabilitation Engineering

Three-dimensional simulation of liquid inj.ction,film formation and transport,in fluidized beds

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Particuology 2009年第5期7卷 337-346页

作者： Paul Zhao Peter j. O'Rourke Dale Snider CPFD Software LLCAlbuquerqueNM 87111USA CFD d'OR Software and Consulting LLCLos AlamosNM 87544USA

Liquid inj.ction, and film formation and transport in dense-phase gas-solids fluidized beds are numerically.simulated in three dimensions using a collisional exchange model that is based on the mechanism that collisions cause transfer of liquid mass, momentum, and energy.between particles. In the model, each of the particles is represented by.a solid core and a liquid film surrounding the core. The model is incorporated in the framework of the commercial code Barracuda developed by.CPFD Software. The commercial software is an advanced CFD-based computational tool where the particles are treated as discrete entities, calculated by.the MP-pic method, and tracked using the Lagrangian method. Details of the collisional liquid transfer model have been previously.presented in O＇Rourke, Zhao, and Snider （2009）; this paper presents new capabilities and proof-testing of the collision model and a new method to better quantify.the penetration length. Example calculations of a fluidized bed without liquid inj.ction show the expected effect of collisions on the reduction of granular temperature （fluctuational kinetic energy. of the bed. When applied to liquid inj.ction into a dense-phase fluidized bed under different conditions, the model predicts liquid penetration lengths comparable to the experiments. In addition, the simulation reveals for the first time the dy.amic mixing of the liquid droplets with the bed particles and the transient distribution of the droplets inside the bed.

关键词： MP-pic Liquid inj.ction Fluidized bed Particle collisions CPFD j.t penetration

Improvement of transfection with reprogramming factors in urine-derived cells

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

BIOCELL 2020年第3期44卷 401-409页

作者： OLIVIA A.ROBLES-RODRÍGUEZ MARÍA j.LOERA-ARIAS j.SÉj.PÉREZ-TRUj.LLO ARNULFO VILLANUEVA-OLIVO ERNESTO picÓN-GALINDO LAURA VILLARREAL-MARTÍNEZ ADOLFO SOTO-DOMÍNGUEZ HUMBERTO RODRÍGUEZROCHA ARACELy.GARCÍA-GARCÍA ODILA SAUCEDO-CÁrdENAS ROBERTO MONTES DE OCA-LUNA Facultad de Medicina Departamento de HistologíaUniversidad Autónoma de Nuevo LeónMonterreyC.P.64460México Hospital Universitario“Dr.j.séEleuterio González González” Servicio de HematologíaUniversidad Autónoma de Nuevo LeónMonterreyC.P.64460México Centro de Investigación Biomédica del Noreste Departamento de Genética MolecularInstituto Mexicano del Seguro SocialMonterreyC.P.64720México

Human-induced pluripotent stem cells(iPSCs)are an accessible source of adult-derived,patient-specific pluripotent stem cells for use in basic research,drug discovery.disease modeling,and stem cell *** the accessibility.of methods to obtain iPSCs regardless of the cell source can enhance their clinical ***,our purpose is to report a simple protocol to obtain iPS-like cells from urine-derived renal epithelial cells(RECs)using different extracellular matrices and transfection *** this study.we began by.culturing urine-derived cells from healthy.donors to establish a primary.culture of renal epithelial cells,followed by.their ***,we generated iPS-like cells by.transfecting renal epithelial cells(RECs)with vectors expressing Oct4,Sox2,L-My.,Lin-28,and Klf4,and we compared the efficacy.of different extracellular matrices and transfection *** resultant iPS-like cells showed a human embry.nic stem cell-like morphology.and expressed the specific pluripotency.markers Oct3/4,Nanog,Lin28,and *** concluded that Lipofectamine Stem Cell transfection reagent is more effective than FuGENE in obtaining iPS-like cells under the conditions ***,the three matrices are similar in their efficiency.of obtaining iPS-like *** report provides an experimental protocol for obtaining and generating iPS-like cells from urine samples for further cell therapy.research on different human diseases.

关键词： Reprogramming factors iPSCs Renal epithelial cells Extracellular matrix Transfection reagent

基于单片机pic18F87j.1的FIR数字低通滤波器设计与实现

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

电子世界 2017年第10期 175-176页

作者：纪峰林郁兆宁波诺丁汉大学理工学院

本文以Microchip公司的8位通用型pic18F87j.1单片机为核心设计了一款FIR数字低通滤波器。该滤波器首先利用信号发生器产生待处理的信号波形;然后使用该单片机内部自带的A/D转换模块对输入信号进行采样;接着通过软件编程实现FIR滤波算法... 详细信息

本文以Microchip公司的8位通用型pic18F87j.1单片机为核心设计了一款FIR数字低通滤波器。该滤波器首先利用信号发生器产生待处理的信号波形;然后使用该单片机内部自带的A/D转换模块对输入信号进行采样;接着通过软件编程实现FIR滤波算法处理;继而通过I/O端口将处理后的数字信号接入梯形电路实现D/A转换;最后利用示波器观察不同频率输入情况下的模拟输出波形。经过相关实验测试证明,该设计是合理且可行的。

关键词：滤波器 pic18F87j.1 FIR 梯形电路 A/D转换

在法国油菜商业品种中导入一个特异抗黑胫病基因:监测基因导入和病菌毒性以避免抗性在法国中部生产测试区丧失(英文)

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

在法国油菜商业品种中导入一个特异抗黑胫病基因:监测基因导入和...

Genetic Diversity.in a Collection of Chinese Sorghum Landraces Assessed by.Microsatellites

第十二届国际油菜大会

作者： Pinochet X. Penaud A. Sauzet G. Lodé M pic E. Mestries E. Carpezat j. CETIOM Centre de GrignonBP 4788850 Thiverval GrignonFrance CETIOM 3 rue F.Pyat18400 Saint-Florent sur CherFrance

近来,新基因型商业油菜品种陆续引入我国。他们对黑胫病(Leptosphaeria maculans)有很好的抗性,因为这些油菜中含有新的主要抗性基因Rlm7。这些品种存在的一个潜在问题是抗性丧失。这就是我们建议开展专门的品种推广,并在抗性丧失可能...

近来,新基因型商业油菜品种陆续引入我国。他们对黑胫病(Leptosphaeria maculans)有很好的抗性,因为这些油菜中含有新的主要抗性基因Rlm7。这些品种存在的一个潜在问题是抗性丧失。这就是我们建议开展专门的品种推广,并在抗性丧失可能性高的推广地区进行监测。在Issoudun和St Florent sur Cher两个城镇之间的大约100Km2区域位于法国的中心地区。在2005006年度种植季节,引入Rlm7品种种植面积占总油菜种植面积的5%。在生长季节对Rlm7品种进行农艺学诊断,并对每个秋季子囊孢子释放量进行观察记载和叶片斑点采样。从采的叶片上分离得到真菌,对其进行纯化并记录毒性资料。特别需要注意的是对Rlm7涉及的寄主的毒性。本文介绍了开始两年的结果。经过鉴定每年分离的真菌只有一个对Rlm7涉及的寄主的有毒性,表明特异的抗性可能在下一年是有效的,尽管有毒的接种体已经存在。不过,这样的试验会持续到下一年,目的是尽可能早点发现真菌量定性改变开始的时间。

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

American j.urnal of Plant Sciences 2012年第12期3卷 1722-1729页

作者： Gloria Burow Cleve D. Franks Zhanguo Xin j.hn j. Burke Dupont Pioneer 2260 CR60 Plainview USA Plant Stress and Germplasm Development Unit Cropping Systems Research Laboratory USDA-ARS Lubbock USA

Genetic diversity.was characterized in a collection of 159 sorghum (Sorghum bicolor L. Moench) landraces gathered from the colder region (primarily.the northeastern region) of China. A set of 41 microsatellites or simple sequence repeat (SSR) markers distributed throughout the 10 chromosomes of sorghum was utilized in the analy.is. Maj.rity.(40 out of 41 SSRs, 98%) of the SSR markers were poly.orphic and highly.informative with poly.orphism information content (pic) value ranging from 0.05 to 0.92. An estimation of genetic similarity.coefficients (GSC, with values ranging from 0.42 to 0.96) revealed a range of variability.in this collection of sorghum landraces. Eight clusters of accessions were identified at a cut off at 0.50 GSC and these groupings were supported by.the analy.is of subpopulations using Structure. This study.provides evidence that Chinese landraces of sorghum exhibit moderate genetic diversity.and results from cluster analy.is may.well aid in identification of diverse accessions that can serve as parental lines for efficient utilization and application of these germplasm into sorghum breeding programs.

关键词： Sorghum Germplasm Landraces Kaoliangs Simple Sequence Repeats Diversity

Particle-in-Cell with Monte CarloCollisions Gun Code Simulations of a Surface-Conversion H^(−)Ion Source

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Computational Phy.ics 2008年第8期4卷 659-674页

作者： E.Chacon-Golcher K.j.Bowers Los Alamos National Laboratory Los AlamosNM 87545USA Los Alamos National Laboratory.Guest Scientist currently at D.E.Shaw&CompanyNew YorkNY 10036USA.

We present an extended update on the status of a particle-in-cellwithMonte Carlo collisions(pic-MCC)gun code developed at LosAlamos for the study.of surfaceconverter H−ion *** programis fully.*** of the program’s features include:solution of arbitrary.electrostatic and magnetostatic fields in an axisy.metric(r,z)geometry.to describe the self-consistent time evolution of a plasma;simulation of a multi-species(e^(−),H^(+),H^(+)_(2),H^(+)_(3),H^(−))plasma discharge from a neutral hy.rogen gas and filament-originated seed electrons;full 2-dimensional(r,z)3-velocity.v_(r),v_(z),vφ)dy.amics for all species;detailed collision phy.ics between charged particles and neutrals and the ability.to represent multiple smooth(not stair-stepped)electrodes of arbitrary.shape and voltage whose surfaces may.be secondary.particle emitters(H^(−)and e^(−)).The status of this development is discussed in terms of its phy.ics content and current implementation details.

关键词： Negative hy.rogen ion source simulation particle-in-cell with Monte Carlo collisions low temperature plasma simulation

On intense proton beam generation and transport in hollow cones

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Matter and Radiation at Extremes 2017年第1期2卷 28-36页

作者： j.j.Honrubia A.Morace M.Murakami ETSI Aeronautica y.del Espacio Universidad Politecnica de MadridMadridSpain Institute of Laser Engineering Osaka UniversityOsakaJapan

Proton generation,transport and interaction with hollow cone targets are investigated by.means of two-dimensional pic simulations.A scaled-down hollow cone with gold walls,a carbon tip and a curved hy.rogen foil inside the cone has been *** acceleration is driven by.a 10^(20) W·cm^(-2) and 1 ps laser pulse focused on the hy.rogen *** show an important surface current at the cone walls which generates a magnetic *** magnetic field is dragged by.the quasi-neutral plasma formed by.fast protons and co-moving electrons when they.propagate towards the cone *** a result,a tens of kT B z field is set up at the cone tip,which is strong enough to deflect the protons and increase the beam divergence *** propose using heavy.materials at the cone tip and increasing the laser intensity.in order to mitigate magnetic field generation and proton beam divergence.

关键词： Inertial fusion energy Ion fast ignition Laser driven ion acceleration