检索结果-南通市图书馆

Comparative Study of Performances of a Single-Cylinder Diesel Enginefueled with Pure Diesel and Blends of Biodiesels/Pure Diesel

引用

Energy and Power Engineering 2021年第3期13卷 111-125页

作者： h. Mbanza Dinganga Y. Tuakashikila muamba C. Tumuinimo Mambote A. Malumba mukaya j. Lami Nzunzu V. Sumuna Temo h. Mbuyi Katshiatshia Center for Research in Energy and Applied Informatics (CREI) Faculty of Polytechnics Université Kongo Mbanza-Ngungu DRC Laboratory of Analytical Chemistry Faculty of Sciences Université de Kinshasa Kinshasa DRC Laboratory of Bioorganic Research (Larebiorg) Faculty of Pharmaceutical Sciences Université de Kinshasa Kinshasa DRC Center for Research in Renewable Energies (CRRE) Faculty of Polytechnics Université de Kinshasa Kinshasa DRC

In this study, the principal objective is to compare the performances of an air-cooled one cylinder, four-stroke direct injection diesel engine using the blends (5% by volume B5, 10% by volume B10) of diesel and biodiesels derived respectively from palm oil, castor oil and raphia sese De Wild oil with pure diesel. All the biodiesels used in this work come from the plant species of the democratic republic of Congo as listed above. The engine performances (power, torque and brake specific consumption) at different engine speeds were determined at both full and partial loads. According to experimental results, the increments in the power output and torque when the mixtures of diesel and biodiesels were used and were observed. On the other side, the specific fuel consumption of the mixtures is higher than that of pure diesel although the calculated lower heating values are almost within the same range for the all studied fuels. Finally, in partial load 1/1, pure diesel blended with biodiesels B5 derived from castor oil presented high specific brake consumption values compared to the other fuels while B10 from the same oil presents low brake specific consumption values for power greater than 3.2 kW.

关键词： Diesel Monocylinder Engine Performances Biodiesels-Gasoil Blends

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

STRUCTURE, MEChANICAL PROPERTIES AND ThERMAL STABILITY OF DIAMOND-LIKE CARBON FILMS PREPARED BY ARC ION PLATING

引用

Acta Metallurgica Sinica(English Letters) 2005年第3期18卷 331-338页

作者： Y.S.Zou j.D.Zheng j.Gong C.Sun R.F.huang L.S.Wen DivisionofSurfaceEngineeringofMaterials InstituteofMetalResearchTheChineseAcademyofSciencesShenyang110016China DivisionofSurfaceEngineeringofMaterials InstituteofMetalResearchTheChineseAcademyofSciencesShenyang110016China／／ShenyangResearchCenterforInterfacialMaterialsShenyang110016China

Diamond-like Carbon (DLC) films have been prepared on Si(100) substrates by arc ion plating in conjunction with pulse bias voltage under h2 atmosphere. The depo sited films have been characterized by scanning electron microscopy and atomic f orce microscopy. The results show that the surface of the film is smooth and den se without any cracks, and the surface roughness is low. The bonding characteris tic of the films has been studied by X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. It shows the sp3 bond content of the film deposited at -200V is 26.7%. The hardness and elastic modulus of the film determined by nanoindent ation technique are 30.8 and 250.1GPa, respectively. The tribological characteri stic of the films reveals that they have low friction coefficient and good wear- resistance. After deposition, the films have been annealed in the range of 350-7 00℃ for 1h in vacuum to investigate the thermal stability. Raman spectra indica te that the ID/IG ratio and G peak position have few detectable changes below 50 0℃. Further increasing the annealing temperature, the hydrogen can be released, the structure rearranges, and the phase transition of sp3 configured carbon to sp2 configured carbon appears.

关键词： diamond-like carbon arc ion plating microstructure mechanical

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

Catalytic feasibility of Ce-doped LaCoO_(3) systems for chlorobenzene oxidation:An analysis of synthesis method

引用

journal of Rare Earths 2022年第6期40卷 897-905,I0002页

作者： héctor Acosta Pérez Carlos A.López Luis E.Cadús Fabiola N.Agüero Chemical Technology Research Institute(INTEQUI) UNSL-CONICETFaculty of Biochemical Chemistry and Pharmacy(UNSL)Almirante Brown 14555700San LuisArgentina

A family of Ce-doped LaCoO_(3) perovskites are presented as possible catalysts for Cl-VOCs *** materials with different contents of Ce were obtained through the citrate and the reactive grinding *** insertion of Ce in the original perovskite structure favours the presence of Co^(2+)/Co^(3+) and Ce^(3+)/Ce^(4+) redox pairs and a higher content of oxygen vacancies that enhances the catalytic performance in chlorobenzene combustion based on differential kinetics *** family obtained by the grinding method presents a performance as high as that synthesized by citrate ***,the reactive grinding is a feasible green chemistry alternative to obtain a catalyst with the same performance as that obtained from traditional ***,the stability of samples was evaluated under total combustion reaction conditions showing an excellent activity during 45 h time on stream.

关键词： Cl-VOCs Perovskites Chlorobenzene Cerium Cobalt Rare earths

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

酸酶结合法制备葡甘露低聚糖的工艺研究

引用

现代食品科技 2008年第1期24卷 32-34页

作者：许牡丹汤木红陕西科技大学生命科学与工程学院陕西西安712021

本文采用酸酶结合的方法制备葡甘露低聚糖,通过单因素实验和正交实验确定最佳工艺条件为:酸解时间1.5h,酶解温度55℃,hCl浓度0.07mol/L,酸解温度85℃,加酶量6000U/g,底物质量浓度80g/L。因素影响大小顺序为:酸解时间>酶解温度>hCl浓度>... 详细信息

本文采用酸酶结合的方法制备葡甘露低聚糖,通过单因素实验和正交实验确定最佳工艺条件为:酸解时间1.5h,酶解温度55℃,hCl浓度0.07mol/L,酸解温度85℃,加酶量6000U/g,底物质量浓度80g/L。因素影响大小顺序为:酸解时间>酶解温度>hCl浓度>酸解温度>加酶量>底物质量浓度。

关键词：葡甘露低聚糖酸解酶解

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

正交试验优选干姜的制备工艺

引用

中国实验方剂学杂志 2015年第15期21卷 23-25页

作者：吕沐钟凌云江西中医药大学药学院南昌330004

目的:优选干姜的制备工艺,为后续干姜煮汁的制备提供参考。方法:以6-姜辣素和挥发油含量的综合评分为评价指标,通过L9(34)正交试验考察切片规格、干燥温度和干燥时间对干姜制备工艺的影响。采用hPLC测定6-姜辣素的含量,流动相乙腈-甲醇-... 详细信息

目的:优选干姜的制备工艺,为后续干姜煮汁的制备提供参考。方法:以6-姜辣素和挥发油含量的综合评分为评价指标,通过L9(34)正交试验考察切片规格、干燥温度和干燥时间对干姜制备工艺的影响。采用hPLC测定6-姜辣素的含量,流动相乙腈-甲醇-水(40∶5∶55),检测波长280 nm。结果:最佳制备工艺为切片规格0.3 cm,置烘箱中55℃烘干,干燥时间18 h。6-姜辣素和挥发油质量分数分别为0.914%,1.273%。结论:优选的制备工艺切实可行,可作为干姜煮汁的原料药制备工艺。

关键词：干姜 6-姜辣素挥发油切片规格

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

基于浮力驱动系统的低功耗升沉运动控制策略

引用

华中科技大学学报（自然科学版） 2019年第6期47卷 57-62页

作者：杨友胜杨翊坤穆为磊邢世琦中国海洋大学工程学院

针对地转海洋学实时阵列(ARGO)浮标的无动力升沉运动,提出了一种新型ARGO浮标混合浮力驱动技术(hBAT),介绍了其组成及工作原理;在分析ARGO浮标及hBAT特性的基础上,建立了ARGO浮标的数学模型.以降低下潜功耗、提升动态特性为目标,对多种... 详细信息

针对地转海洋学实时阵列(ARGO)浮标的无动力升沉运动,提出了一种新型ARGO浮标混合浮力驱动技术(hBAT),介绍了其组成及工作原理;在分析ARGO浮标及hBAT特性的基础上,建立了ARGO浮标的数学模型.以降低下潜功耗、提升动态特性为目标,对多种浮力驱动控制器的动态特性及功耗进行了对比分析;同时,以上浮功耗最低为目标,对不同最大工作压差下的上浮运动中的功耗进行了分析.结果表明:在下潜运动中,模糊PID(比例-积分-微分)控制器在负载扰动下具有较好的动态特性与功耗特性,能够适应海洋复杂多变的环境,提升ARGO浮标工作性能;而在上浮运动过程中,当齿轮泵的最大工作压差为9.2 MPa时,浮力驱动系统的功耗最低,约为2.023 W·h.

关键词：地转海洋学实时阵列(ARGO)浮标混合浮力驱动压力补偿定深控制低功耗

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

高能炸药性能的小型筛选试验：应用新型炸药LLM-105

引用

火工情报 2001年第2期 45-53页

作者： j．LCutting．h．h．Chau 彭和平

将新型炸药分子或配方的工艺过程按比例扩大，生产足够量的材料来说明该炸药的爆轰性能是费时的和昂贵的。计算的性能数据不可能始终与测定的性能数据相一致。为此，将时间和财力花费在新材料的发火性能试验上，最终证实是不合算的。我... 详细信息

将新型炸药分子或配方的工艺过程按比例扩大，生产足够量的材料来说明该炸药的爆轰性能是费时的和昂贵的。计算的性能数据不可能始终与测定的性能数据相一致。为此，将时间和财力花费在新材料的发火性能试验上，最终证实是不合算的。我们开展了小型试验，用一点点材料就可对新炸药的性能作出初步的判定。我们也对几种常用炸药进行了试验，这些炸药是LX-10(hMX95%/Viton A粘合剂5％)，LX-16(PETN96％／EPC46l粘合剂4％)和LX-17(TATB92．5％／Kel-F800粘合剂7．5％)。试验结果与用圆筒试验测得的状态方程的计算相一致。我们也可以直接将这种新材料与那些熟知炸药的试验结果相比。我们采用新的试验方法对我们最新合成的炸药2．6-二氨基-3．5-二硝基吡嗪-l-氧化物(LLM—105)进行性能鉴定。这种钝感含能材料的能量比TATB大25%。这种材料的能量和热稳定性使得它有不同的应用，包括应用于钝感传爆药和雷管都受到了极大关注。我们将在本文中介绍用30g材料评定LLM—l05的方法。

关键词：高能炸药小型筛选试验 LLM-105 爆炸箔起爆器试验装置爆轰性能圆筒试验 “2.6-二氨基-3.5-二硝基吡嗪-l-氧化物” 发火性能

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

Q-switched ytterbium doped fiber laser using multi-walled carbon nanotubes saturable absorber

引用

Chinese Optics Letters 2014年第3期12卷 41-44页

作者： N.Kasim A.h.h.Al-Masoodi F.Ahmad Y.munajat h.Ahmad S.W.harun Advanced Photonics Science Institute Faculty of ScienceUniversity Technology Malaysia Photonics Research Centre University of Malaya Department of Electrical Engineering Faculty of EngineeringUniversity of Malaya

A Q-switched ytterbium-doped fiber laser （YDFL） is proposed and demonstrated using a newly developed multi-walled carbon nanotubes polyethylene oxide （MWCNTs-PEO） film as a passive saturable absorber （SA）. The saturable absorber is prepared by mixing the MWCNTs homogeneous solution into a dilute PEO polymer solution before it is left to dry at room temperature to produce thin film. Then the film is sandwiched between two FC/PC fiber connectors and integrated into the laser cavity for Q-switching pulse generation. The laser generates a stable pulse operating at wavelength of 1060.2 nm with a threshold pump power of 53.43 mW. The YDFL generates a stable pulse train with repetition rates ranging from 7.92 to 24.27 khz by varying 980-nm pump power from 53.42 to 65.72 mW. At 59.55-mW pump power, the lowest pulse width and the highest pulse energy are obtained at 12.18 μs and 143.5 n j, respectively.

关键词： MWCNTs PEO length SA Q-switched ytterbium doped fiber laser using multi-walled carbon nanotubes saturable absorber

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

Temperature and Acidified Solvent Effect on Total Anthocyanins and RP-hPLC Phenolic Acids Determination in Selected Spices

引用

Food and Nutrition Sciences 2016年第1期7卷 20-29页

作者： Sufyan h. Tashtoush Khalil I. Ereifej hao Feng Taha M. Rababah muhammad h. Al-U’datt Sana Gammoh Ghaid j. Al-Rabadi Department of Nutrition and Food Technology Faculty of Agriculture Jordan University of Science and Technology Irbid Jordan Department of Food Science and human Nutrition University of Illinois Urbana-Champaign USA Department of Animal Production Faculty of Agriculture Mutah University Al-Karak Jordan

Total anthocyanins of spices (Syzygium aromaticum L., Coriadrum sativum L., Cuminum cyminum L., Zingiber officinale Rosc., Elettaria cardamomum, Curcuma longa, Rhus coriaria L., Cinnamomum zeylanicum Blume, Foeniculum vulgare Mill and Laurus nobilis L.) were determined using acidified (1% hCl) solvents (methanol, ethanol and acetone) at three temperatures (20℃, 40℃ and 60℃). Also phenolic acids were separated and identified by RP-hPLC. Results showed that sumac and cinnamon had the highest levels of anthocyanins, while for the acetone the cinnamon indicated the highest amount of anthocyanins when methanol and ethanol were used as extracting solvents at 20℃. At 40℃ using ethanol, sumac showed the highest level of anthocyanins whereas acetone solvent yielded the highest anthocyanin contents for cinnamon. At 60℃, cinnamon showed the highest level of anthocyanins when methanol and acetone were the solvents, while sumac had the highest anthocyanins level using ethanol as solvent. hPLC results showed ten phenolic acids found in those spices and varied in their concentrations. Gallic acid had the highest level (1642.3 mg/100g) (cloves). Gentisic acid had the lowest level (1.2 mg/100g) in ginger. Also sumac showed the highest level of chlorogenic acid (1528.7 mg/100g). Some acids were not found in some spices, for instance, benzoic acid was not found in coriander, cumin, ginger, green cardamom, cinnamon and sweet laurel.

关键词： Spices Anthocyanins Phenolic Acids hPLC and Acidified Solvents

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

Radiotherapy-customized head immobilization masks:from modeling and analysis to 3D printing

引用

Nuclear Science and Techniques 2019年第9期30卷 103-118页

作者： M.A.R.Loja D.S.Craveiro L.Vieira E.Sousa j.A.Rodrigues R.j.F.Portal CIMOSM Centro de Investigacao em Modelacao e Optimizacao de Sistemas Multifuncionais ISEL IPL Instituto Superior de Engenharia de Lisboa Av. Conselheiro Emidio Navarro 1 1959-007 Lisbon Portugal LAETA IDMEC Instituto Superior Teccnico Universidade de Lisboa Av. Rovisco Pais 1 1049-001 Lisbon Portugal Department of Mechanical and Industrial Engineering Faculty of Science and Technology NOVA UNIDEMI Universidade Nova de Lisboa Caparica Portugal h&TRC -health &Technology Research Center ESTeSL - Escola Superior de Tecnologia da Saude de Lisboa Av. D. Joao II Lote 4.69.01 1990-096 Lisbon Portugal Instituto de Biofisica e Engenharia Biomedica Faculdade de Ciencias da Universidade de Lisboa Lisbon Portugal

Immobilization devices may be a valuable aid to ensure the improved effectiveness of radiotherapy treatments where constraining the movements of specific anatomical segments is crucial. This need is also present in other situations, specifically when the superposition of various medical images is required for fine identification and characterization of some pathologies. Because of their structural characteristics, existing head immobilization systems may be claustrophobic and very uncomfortable for patients, during both the modeling and usage stages. Because of this, it is important to minimize all the discomforts related to the mask to alleviate patients’ distress and to simultaneously guarantee and maximize the restraint effectiveness of the mask. In the present work, various head immobilization mask models are proposed based on geometrical information extracted from computerized tomography images and from 3D laser scanning point clouds. These models also consider the corresponding connection to a radiotherapy table, as this connection is easily altered to accommodate various manufacturers’ solutions. A set of materials used in the radiotherapy field is considered to allow the assessment of the stiffness and strength of the masks when submitted to typical loadings.

关键词： Computed tomography 3D laser scanning Geometric modeling head immobilization devices Stiffness and strength analyses 3D printing

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：