检索结果-南通市图书馆

Wild melon: a novel non-edible feedstock for bioenergy

Petroleum Science 2018年第2期15卷 405-411页

作者： maria ameen Muhammad Zafar Mushtaq Ahmad Anjuman Shaheen Ghulam Yaseen Biofuel Laboratory Department of Plant Sciences Quaid-i-Azam University Department of Environmental Science Female CampusInternational Islamic University Islamabad

In the present research work, a non-edible oil source Cucumis melo var. agrestis （wild melon） was systematically identified and studied for biodiesel production and its characterization. The extracted oil was 29.1% of total dry seed weight. The free fatty acid value of the oil was found to be 0.64%, and the single-step alkaline transesterification method was used for conversion of fatty acids into their respective methyl esters. The maximum conversion efficiency of fatty acids was obtained at 0.4 wt% NaOH （used as catalyst）, 30% （methanol to oil, v/v） methanol amount, 60 ℃ reaction temperature, 600-rpm agitation rate and 60-min reaction time. Under these optimal conditions, the conversion efficiency of fatty acid was 92%. However, in the case of KOH as catalyst, the highest conversion （85%） of fatty acids was obtained at 40% methanol to oil ratio, 1.28 wt% KOH, 60 ℃ reaction temperature, 600-rpm agitation rate and 45 min of reaction time. Qualitatively, biodiesel was characterized through Fourier transform infrared spectroscopy （FFIR） and gas chromatography and mass spectroscopy （GC-MS）. FTIR results demonstrated a strong peak at 1742 cm-1, showing carbonyl groups （C=O） of methyl esters. However, GC-MS results showed the presence of twelve methyl esters comprised of lauric acid, myristic acid, palmitic acid, non-decanoic acid, hexadecanoic acid, octadecadienoic acid and octadecynoic acid. The fuel properties were found to fall within the range recommended by the international biodiesel standard, i.e., American Society of Testing Materials （ASTM）： flash point of 91℃, density of 0.873 kg/L, viscosity of 5.35 cSt, pour point of - 13 ℃, cloud point of -10 ℃, total acid number of 0.242 mg KOH/g and sulfur content of 0.0043 wt%. The present work concluded the potential of wild melon seed oil as excellent non-edible source of bioenergy.

关键词： Cucumis melo var. agrestis Wild melon seed oil (WMSO) Transesterification Bioenergy Characterization Fuel properties

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

Comprehensive analysis of glacier recession(2000-2020)in the Nun-Kun Group of Glaciers,Northwestern Himalaya

引用

Journal of Mountain Science 2024年第3期21卷 768-785页

作者： Shakil Ahmad ROMSHOO Ummer ameen Mustafa Hameed BHAT Tariq ABDULLAH Department of Geoinformatics University of KashmirSrinagarKashmir 190006India Islamic University of Science and Technology AwantiporaKashmir 192122India Centre of Excellence for Glacier Studies in the Western Himalaya University of KashmirSrinagarKashmir 190006India

Himalayan glaciers are shrinking rapidly,especially after *** shrinkage,however,shows a differential pattern in space and time,emphasizing the need to monitor and assess glacier changes at a larger *** this study,changes of 48 glaciers situated around the twin peaks of the Nun and Kun mountains in the northwestern Himalaya,hereafter referred to as Nun-Kun Group of Glaciers(NKGG),were investigated using Landsat satellite data during *** in glacier area,snout position,Equilibrium Line Altitude(ELA),surface thickness and glacier velocity were assessed using remote sensing data supplemented by field *** study revealed that the NKGG glaciers have experienced a recession of 4.5%±3.4%and their snouts have retreated at the rate of 6.4±1.6 m·a^(-1).Additionally,there was a 41%increase observed in the debris cover area during the observation *** the geodetic approach,an average glacier elevation change of-1.4±0.4 m·a^(-1)was observed between 2000 and *** observed mass loss of the NKGG has resulted in the deceleration of glacier velocity from 27.0±3.7 m·a^(-1)in 2000 to 21.2±2.2 m·a^(-1)in *** ELA has shifted upwards by 83.0±22 m during the *** morphological and topographic factors showed a strong influence on glacier ***,a higher recession of 12.9%±3.2%was observed in small glaciers,compared to 2.7%±3.1%in larger *** debris-covered glaciers showed lower shrinkage(2.8%±1.1%)compared to the clean glaciers(9.3%±5%).The glacier depletion recorded in the NKGG during the last two decades,if continued,would severely diminish glacial volume and capacity to store water,thus jeopardizing the sustainability of water resources in the basin.

关键词： Nun-Kun range Glacier recession Glacier snout Remote Sensing Himalaya Glacier velocity

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

Blockchain privacy and regulatory compliance: Towards a practical equilibrium

引用

BLOCKCHAIN-RESEARCH AND APPLICATIONS 2024年第1期5卷 1-9页

作者： Buterin, Vitalik Illum, Jacob Nadler, Matthias Schar, Fabian Soleimani, ameen Ethereum Fdn Zug Switzerland Chainalysis New York NY USA Univ Basel Basel Switzerland Privacy Pools W Palm Beach FL USA

We study Privacy Pools, a novel smart contract -based privacy -enhancing protocol. The protocol introduces a mechanism for users to reveal certain properties of their transaction without having to reveal the transaction itself. The core concept involves allowing users to publish a zero -knowledge proof, demonstrating that their funds (do not) originate from known (un-)lawful sources, without publicly revealing their entire transaction history. This is achieved by proving membership in custom association sets, which are designed to demonstrate compliance with regulatory frameworks or social consensus. We illustrate how this mechanism can create a separating equilibrium between compliant and non -compliant withdrawals. Our work describes the technical underpinnings, incentives, and broader implications of this mechanism, highlighting how Privacy Pools -like protocols can create more private yet compliant blockchain transactions.

关键词： Blockchain Privacy Regulation Smart contracts Zero-knowledge proofs

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

赛德西港用于船舶减排的陆上可再生能源供电评估

引用

哈尔滨工程大学学报（英文版） 2024年第2期23卷 506-524页

作者： Merna Makram ameen M.Bassam Adel A.Tawfik Waleed Yehia Naval Architecture and Marine Eng.Dept. Faculty of EngineeringPort Said UniversityPort Fuad 42526Egypt

Air pollution from shipping is becoming a critical issue,particularly in dense hub port *** proposed solution to minimize ship-based emissions at ports is the implementation of an Onshore Power Supply(OPS)*** allows ships to shut off their auxiliary engines and instead connect to the port *** there have been numerous studies conducted on ports in Europe and the United States,little research has been done on Egyptian ***,this paper aims to investigate the feasibility of implementing OPS at Port Said West Port in Egypt,aligning with Egypt Vision 2030’s goals for addressing climate *** research primarily focuses on analyzing data collected from calling ships to generate socio-economic and cost-effectiveness analyses of *** further enhance the environmental benefits of OPS,the paper proposes the use of solar energy as the OPS electricity *** findings of the study revealed that by relying on the national grid,emissions can be reduced by 28%.Moreover,it is predicted that this reduction could reach 100%if electricity generation is solely based on solar ***,the economic analysis demonstrates promising profitability,with a payback period of approximately two years.

关键词： Onshore power supply Port sustainability Shipping emissions inventory Solar energy Photovoltaic systems

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

亚洲象不同组织来源成纤维细胞系的建立及其生物学特性研究

引用

中国畜牧兽医 2024年第9期51卷 3752-3761页

作者：李晋达彭自伟 Muhammad ameen Jamal 角德灵魏红江云南省小型猪基因编辑与异种器官移植重点实验室昆明650201 云南农业大学动物医学院昆明650201 云南农业大学动物科学技术学院昆明650201

【目的】建立不同年龄、不同组织来源的亚洲象成纤维细胞系,并进行冷冻保存和细胞生物学特性研究,为实现濒危动物遗传资源保存和开发利用提供理论依据。【方法】分别采集6岁龄亚洲象耳缘组织(AE00)、新生亚洲象脐带组织(AE01)及死亡16 ... 详细信息

【目的】建立不同年龄、不同组织来源的亚洲象成纤维细胞系,并进行冷冻保存和细胞生物学特性研究,为实现濒危动物遗传资源保存和开发利用提供理论依据。【方法】分别采集6岁龄亚洲象耳缘组织(AE00)、新生亚洲象脐带组织(AE01)及死亡16 h后的4岁龄亚洲象耳缘组织(AE02)样品,分别建立成纤维细胞系并进行传代培养和冷冻保存,通过细胞形态学、增殖能力、衰老及凋亡水平分析不同年龄、不同组织来源成纤维细胞的生物学特性,并进行绿色荧光蛋白(GFP)转染筛选和核型检测,分析亚洲象成纤维细胞的遗传稳定性。【结果】成功建立了3头亚洲象成纤维细胞系并进行冷冻保存,复苏后细胞均能保持一定水平的活力,经连续传代培养后,细胞形态均呈梭形;AE02成纤维细胞冻存活力、细胞增殖能力均最佳,细胞凋亡率依次为AE01(16.7%)>AE00(6.4%)>AE02(3.8%),细胞衰老率依次为AE00(35.9%)>AE01(17.2%)>AE02(7.8%);AE02细胞经长达19次传代后,细胞染色体数目稳定,AE00进行GFP转染筛选可获得稳定表达GFP的亚洲象成纤维细胞系。【结论】本研究成功建立了不同年龄、不同组织来源的亚洲象成纤维细胞系,细胞形态均为梭形,不同年龄、不同组织来源的成纤维细胞系增殖能力、细胞衰老及凋亡水平均不同,经连续传代后细胞染色体数目稳定,能实现外源基因的稳定转染和长期筛选,可作为濒危动物遗传资源长期保存和复活个体的重要方法之一。

关键词：亚洲象成纤维细胞生物学特性

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

Finite element analysis of dynamic stability of skeletal structures under periodic loading

引用

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第2期8卷 245-256页

作者： THANA Hemantha Kumar ameen Mohammed Department of Civil Engineering National Institute of Technology Calicut Kerala 673601 India

This paper addresses the dynamic stability problem of columns and frames subjected to axially applied periodic loads. Such a structure can become unstable under certain combinations of amplitudes and frequencies of the imposed load acting on its columns/beams. These are usually shown in the form of plots which describe regions of instability. The finite element method (FEM) is used in this work to analyse dynamic stability problems of columns. Two-noded beam elements are used for this purpose. The periodic loading is decomposed into various harmonics using Fourier series expansion. Computer codes in C++ using object oriented concepts are developed to determine the stability regions of columns subjected to periodic loading. A number of nu-merical examples are presented to illustrate the working of the program. The direct integration of the equations of motions of the discretised system is carried out using Newmark’s method to verify the results.

关键词： Finite element analysis Dynamic stability Mathieu-Hill equation

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

Chromaticity of Complete 6-Partite Graphs with Certain Star or Matching Deleted Ⅱ

引用

Acta Mathematicae Applicatae Sinica 2013年第1期29卷 35-42页

作者： Roslan Hasni ameen Shaman ameen Yee-Hock Peng Hai-xing Zhao School of Mathematical Sciences Universiti Sains Malaysia Department of Mathematics and Institute for Mathematical Research University Putra Malaysia Department of Mathematics Qinghai Normal University

Let P（G, λ） be the chromatic polynomial of a graph G. Two graphs G and H are said to be chromatically equivalent, denoted G N H, if P（G, λ） = P（H, λ）. We write [G] = {HIH - G}. If [G] = {G}, then G is said to be chromatically unique. In this paper, we first characterize certain complete 6-partite graphs with 6rid＋1 vertices according to the number of 7-independent partitions of G. Using these results, we investigate the chromaticity of G with certain star or matching deleted. As a by-product, many new families of chromatically unique complete 6-partite graphs with certain star or matching deleted are obtained.

关键词： chromatic polynomial chromatically closed chromatic uniqueness

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

Synthesis of thiopyrano[4″,3″:4′,5′]pyrido[3′,2′:4,5]furo[3,2-d]pyrimidines

引用

Chinese Chemical Letters 2010年第6期21卷 669-673页

作者： Essam Kh. Ahmed Mohamed A. ameen Chemistry Department Faculty of ScienceEl Minia UniversityEl Minia 61519Egypt

Reactions of the 6-hydroxy-thiopyrano[3,4-c]pyridine-5-carbonitrile derivative 1 withα-halo-carbonyl compounds gave the ortho-substituted intermediates 2a-c which were converted into furo[2,3-b]thiopyrano[4,3-d]pyridines 3a-c by fusion of a furan moiety under basic *** cyclization of 3a-c led to a fusion of a pyrimidine ring,yielding the tetracyclic products 6,7 and *** addition,condensation of 6 with various aromatic aldehydes afforded the corresponding imines 9a,*** reaction of 7 gave products 10a,b.

关键词： S N-Heterocycles S N O-Heterocyles Furo[2 3-b]thiopyrano[4 3-d]pyridine Thiopyranopyridofuropyrimidines

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

Changes in soil temperature and water content under mobile soil steam disinfection

引用

International Journal of Agricultural and Biological Engineering 2021年第3期14卷 140-147页

作者： Zhenjie Yang Xiaochan Wang Muhammad ameen College of Engineering Nanjing Agricultural UniversityNanjing 210031China College of Mechanical and Electrical Engineering Yunnan Agricultural UniversityKunming 650201China

The soil steam injection method is one of the most effective disinfection methods,and the determination of the steam pipe structure parameters is very *** steam capillary diameter(SCD)affects the steam flow field in each pipe,which in turn affects the steam changes in the soil flow range and soil temperature(ST).Larger SCD would make lower ST in clay loam,silt loam,and sandy clay *** effectiveness of an SCD of 10 mm was verified by a mobile disinfection test at walking speeds of 10 cm/min and 30 cm/min under soil water content(SWC)of 15%and 35%,*** results showed that when the walking speed was 10 cm/min,the initial SWC was proportional to the ***,when the walking speed was 30 cm/min,the law was exactly the opposite;that is,the initial water content is inversely proportional to the *** research can provide a theoretical research foundation for increasing soil temperature for efficient soil steam disinfection.

关键词： soil steam disinfection steam capillary diameter steam capillary vent soil temperature soil water content

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

Membrane Fouling in Microfiltration of Sanitary Landfill Leachate for Removals of Colourand Solids

引用

应用与环境生物学报 2013年第1期19卷 184-188页

作者： Emad S.M.ameen Water Research Alliance Institute of Environmental and Water Resource ManagementFaculty of Civil EngineeringUniversiti Teknologi Malaysia

In this research,the treatability of solids from sanitary landfill leachate by microfiltration membrane was investigated and the fouling of the membrane was carefully *** microfiltration process was carried out for 21 h in experimental system involved coagulation with Moringa oleifera followed by filtration using submerged hollow fibre microfiltration membrane (MFM).Coagulation with ***,air diffusers and back flush technique were used for preventing or alleviating fouling of the *** hollow fibre MFM showed high removals of 98%,91% and 99% for turbidity,colour and total suspended solids *** was obtained at the beginning of the ***,quality of the filtrate rapidly declined during the filtration *** was found to proceed according to the classical cake filtration *** with *** as well as the back-flush technique could not fully restore the deterioration occurred to the membrane.

关键词： RAPD ISSR AFLP 环境生物学

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：