检索结果-南通市图书馆

从含Cu,Ni,Fe和Zn离子的Sarcheshmeh铜矿合成及工业溶液中萃取和反萃Cu和Ni（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

Transactions of Nonferrous Metals Society of China 2020年第2期30卷 518-534页

作者： amirhossein SOEEZI Hadi ABDOLLAHI Sied Ziaedin SHAFAEI Esmaeil RAHIMI School of Mining engineering College of EngineeringUniversity of TehranTehranIran Department of Mining Engineering Islamic Azad UniversitySouth Tehran BranchTehranIran

以D2EHPA、LIX 984、Cyanex 302、Chemorex CP 150和Acorga 5774为萃取剂,煤油为稀释剂,对取自Sarcheshmeh铜矿含Cu(770mg/L)、Ni(3200mg/L)、Fe(800mg/L)和Zn(200mg/L)的合成及工业溶液中Cu和Ni的萃取与反萃进行全面研究。萃取阶段考虑的影响因素有混合速度和时间、萃取剂浓度、p H和温度。此外,采用不同浓度的各种无机和有机酸(硫酸、盐酸、硝酸和柠檬酸)对Cu和Ni进行反萃。结果表明,在时间为3 min、混合速度为500 r/min、温度为28℃以及A/O比为1:1的条件下,Cu和Ni的萃取率最高。此外,用10%(v/v)LIX984可有效萃取Cu,而用30%(v/v)Cyanex 302可有效萃取Ni。萃取Cu和Ni的最佳p H分别为2~3和4~5。从含Ni、Cu、Zn和Fe离子的合成及工业溶液中可选择性萃取Cu和Ni,其萃取率分别为85%、93%和77%、82%。最佳条件实验结果表明,合成及工业溶液中Ni的反萃率达96%,Cu的反萃率为93%。最后,分别用D2EHPA、LIX 984和Cyanex 3023种萃取剂分3个阶段萃取Zn、Fe、Cu和Ni 4种元素,而杂质萃取率最低。

关键词：溶剂萃取镍铜 D2EHPA LIX 984 Cyanex 302

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

轮胎识别技术

现代橡胶技术 2022年第6期48卷 37-40页

作者：李帅星(编译) amirhossein Shahadi 不详

根据当今轮胎行业的需求,尤其对于拥有全球销售市场的公司来说,在整个产品生命周期中跟踪和记录产品信息变得至关重要。轮胎可通过一组由四位数组成的代码被识别,该代码表示生产的周次和年份;但是,它们的识别码并不是唯一的。因此,轮胎... 详细信息

根据当今轮胎行业的需求,尤其对于拥有全球销售市场的公司来说,在整个产品生命周期中跟踪和记录产品信息变得至关重要。轮胎可通过一组由四位数组成的代码被识别,该代码表示生产的周次和年份;但是,它们的识别码并不是唯一的。因此,轮胎上标记信息的局限性,以及在整个产业链中识别和跟踪轮胎缺乏清晰度所导致的问题。

关键词：轮胎行业产品生命周期识别码识别技术产业链销售市场代码清晰度

Graphene-based catalysts for electrochemical carbon dioxide reduction

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Carbon Energy 2020年第2期2卷 158-175页

作者： amirhossein Hasani Mahider Asmare Teklagne Ha Huu Do Sung Hyun Hong Quyet Van Le Sang Hyun Ahn Soo Young Kim School of Chemical Engineering and Materials Science Integrative Research Center for Two-Dimensional Functional MaterialsInstitute of Interdisciplinary Convergence ResearchChung-Ang UniversitySeoulRepublic of Korea Department of Materials Science and Engineering Korea UniversitySeoulRepublic of Korea Institute of Research and Development Duy Tan UniversityDa NangVietnam

Electrochemical carbon dioxide(CO2)reduction is considered to be an efficient strategy to produce usable fuels and overcome the concerns regarding global warming.For this purpose,an efficient,earth abundant,and a low cost catalyst has to be designed.It has been found that graphene-based materials could be promising candidates for CO2 conversion because of their unique physical,mechanical,and electronic properties.In addition,the surface of graphenebased materials can be modified by using different strategies,including doping,defect engineering,producing composite structures,and wrapping shapes.In this review,the fundamentals of electrochemical CO2 reduction and recent progress of graphene-based catalysts are investigated.Furthermore,recent studies on graphene-based materials for CO2 reduction are summarized.

关键词： catalyst CO2 reduction electrochemical graphene

Frequency Hopping Spread Spectrum Security Improvement with Encrypted Spreading Codes in a Partial Band Noise Jamming Environment

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Information Security 2013年第1期4卷 1-6页

作者： amirhossein Ebrahimzadeh Abolfazl Falahati Digital Cryptography and Coding Laboratory (DCCS Lab) Department of Electrical Engineering Iran University of Science and Technology Tehran Iran

Frequency Hopping Spread Spectrum (FHSS) system is often deployed to protect wireless communication from jamming or to preclude undesired reception of the signal. Such themes can only be achieved if the jammer or undesired receiver does not have the knowledge of the spreading code. For this reason, unencrypted M-sequences are a deficient choice for the spreading code when a high level of security is required. The primary objective of this paper is to analyze vulnerability of linear feedback shift register (LFSRs) codes. Then, a new method based on encryption algorithm applied over spreading codes, named hidden frequency hopping is proposed to improve the security of FHSS. The proposed encryption security algorithm is highly reliable, and can be applied to all existing data communication systems based on spread spectrum techniques. Since the multi-user detection is an inherent characteristic for FHSS, the multi-user interference must be studied carefully. Hence, a new method called optimum pair “key-input” selection is proposed which reduces interference below the desired constant threshold.

关键词： Frequency Hopping Spread Spectrum Key Distribution Centre Key Encryption Key Linear Feedback Shift Register Frequency Hopping Code Division Multiple Access Direct Sequence Spread Spectrum

Macroscopic Equation and Its Application for Free Ways

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Geology 2017年第7期7卷 915-922页

作者： Mahmoodreza Keymanesh amirhossein Esfahanizad Mousavi Engineering Faculty PNU Tehran Iran Transportation of Tehran PNU Tehran Iran

Effective transportation systems lead to the efficient movement of goods and people, which significantly contribute to the quality of life in every society. In the heart of every economic and social development, there is always a transportation system. Mathematically the problem of modeling vehicle traffic flow can be solved at two main observation scales: The microscopic and the macroscopic levels. In the microscopic level, every vehicle is considered individually, and therefore, for every vehicle, we have an equation that is usually an ordinary differential equation (ODE). At a macroscopic level, we use from the dynamics models, where we have a system of partial differential equation, which involves variables such as density, speed, and flow rate of traffic stream with respect to time and space. Therefore, considering above content, this study has tried to compare solution of equation of macroscopic flow considering linear form (speed-density) and applying boundary condition that resulting to form solved is non-linear one-order partial differential equation (sharpy method) with non-linear assuming (speed and density) and consequently homographic nonlinear relation (speed-density). The recent case clearly gives more significant speeds than linear case of speed and density that can be a good scientific basis. In terms of safety for accidents and traffic signal, just as a reminder, but it is resulted of the reality that generally solutions of partial differential equations can have different forms. Therefore, the solution of partial differential equation (macroscopic flow) can have different answers and solutions so that all of these solutions apply in PDE (equation of macroscopic flow). Thus, under this condition, we can have solution of linear equation similar to greenberg or greenshield & android that are explained in logarithm and exponential function, but this article is based mostly on nonlinear solution of macroscopic equation, provided that existing nonlinear relationship between speed and density (homogra

关键词： Freeways Flow Rates Density Average Speed PDE (Macroscopic Flow) Nonlinear Resolution of Equation Homographic Function

A Parametric Study of Mechanical Cross-Coupling in Parallel-Kinematics Piezo-Flexural Nano-Positioning Systems

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Applied Sciences 2021年第5期11卷 596-613页

作者： Abbas Shafiee amirhossein Ahmadian Amin Akbari School of Mechanical Engineering Purdue University West Lafayette USA Department of Mechanical and Aerospace Engineering University of California Los Angeles USA

Piezo-electric nano-positioning stages are being widely used in applications in which precision and accuracy in the order of nano, and high scanning speeds are paramount. This paper presents a Finite Element Analysis (FEA) of the parallel piezo-flexural nano-positioning (PPNP) stages to investigate motion interference between their different axes. Cross-coupling is one of the significant contributors to undesirable runouts in the precision positioning of PPNP actuators. Using ABAQUS/CAE 2018 software, a 3D model of a PPNP stage was developed. The model consists of a central elastic body connected to a fixed frame through four flexural hinges. A cylindrical stack of multiple piezoelectric disks is placed between the moving central body and the fixed frame. Extensive simulations were carried out for three different friction coefficients in the piezoelectric disks’ contact surfaces, different frame materials, and different geometrical configurations of the stage and the hinges. As a result, it was observed that the primary root cause of the mechanical cross-coupling effect could be realized in the combination of the slip and rotation of the piezoelectric disks due to their frictional behavior with the stage moving in the tangential direction, concurrent with changes in the geometry of the stage.

关键词： Nano-Positioning Stages Piezoelectric Actuators Mechanical Cross-Coupling Finite Element Analysis Friction

Flexible Paper-Based Li-ion Batteries: A Review

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Engineering and Technology 2021年第2期9卷 285-299页

作者： amirhossein Ahmadian Abbas Shafiee Mohammadali Alidoost Amin Akbari Department of Mechanical and Aerospace Engineering University of California Los Angeles CA USA School of Mechanical Engineering Purdue University West Lafayette IN USA Department of Bioengineering University of California Los Angeles CA USA

Lithium-ion (Li-ion) batteries have been fabricated in various ways to improve flexibility. Flexibility could be enhanced via active materials, separators, electrodes, and electrolytes, which could then be integrated to form flexible electronic devices with promising electrochemical properties compared to traditional non-flexible Li-ion batteries. Recent progress towards flexible Li- ion batteries fabrication, materials, and their electrochemical properties are investigated in this review. Additionally, recent developments in electronic devices utilizing flexible batteries and their future applications are explored. Portable and wearable electronics, as the primary beneficiaries of the flexible, rechargeable, and high-performance Li-ion batteries, are examined. In the end, various applications and challenges of flexible batteries in healthcare and various energy storage systems, considering practical implementation, are argued.

关键词： Lithium-Ion (Li-Ion) Batteries Flexible Batteries Paper-Based Batteries

Small Satellite Modelling and Three-axis Magnetorquer-based Stabilisation Using Fuzzy Logic Control

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Small Satellite Modelling and Three-axis Magnetorquer-based ...

Draft Genome Sequence of Mentha Iongifolia and Development of Resources for Mint Cultivar Improvement

2012 International Conference on Mechanical Engineering and Materials(ICMEM 2012)

作者： amirhossein Asadabadi Amir Anvar The University of Adelaide School of Mechanical Engineering

Recently small satellites have become increasingly popular because of their ability to provide educational institutes with the chance to design, construct, and test their spacecraft from beginning to the possible launch due to the low launching cost and development of microelectronics（Figure 1）. Clearly, using only electromagnetic coils instead of different types of actuators will serve the purpose of weight reduction where every grams counts. But some restrictions described in the paper limit utilising only "Electromagnetic" actuation for 3D stabilisation and adversely affects the efficiency of the controller. However, there are some theories developed recently that have made the aforementioned purpose feasible. In this paper a new control method based on Fuzzy Logic Control（FLC） is presented that keeps the satellite in desired conditions only by electromagnetic coils. More precisely, an approach of Fuzzy control which is incorporated with electromagnetic actuation is presented for the in-orbit attitude control of a small satellite. The design is developed to stabilize the spacecraft against disturbances with a three-axis stabilizing capability. The paper also describes the required hardware and the design and development of the magnetic torquers.

关键词： Fuzzy Attitude Control Small Satellite Fuzzy Logic Control Electromagnetic Magnetic Control

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

Molecular Plant 2017年第2期10卷 323-339页

作者： Kelly J. Vining Sean R. Johnson amirhossein Ahkami Iris Lange Amber N. Parrish Susan C. Trapp Rodney B. Croteau Shannon C.K. Straub Iovanna Pandelova B. Markus Lange Department of Horticulture Oregon State University Corvallis OR 97331 USA M. J. Murdock Metabolomics Laboratory Institute of Biological Chemistry Washington State University Pullman WA 99164-6340 USA Department of Biology Hobart and William Smith Colleges Geneva NY 14456 USA Present address: Pacific Northwest National Laboratory Environmental Molecular Sciences Laboratory (EMSL) Richiand WA 99354 USA Present address: Medifluidics Inc. Fort Collins. CO 80525 USA

The genus Mentha encompasses mint species cultivated for their essential oils, which are formulated into a vast array of consumer products. Desirable oil characteristics and resistance to the fungal disease Verti- cillium wilt are top priorities for the mint industry. However, cultivated mints have complex polyploid ge- homes and are sterile. Breeding efforts, therefore, require the development of genomic resources for fertile mint species. Here, we present draft de novo genome and plastome assemblies for a wilt-resistant South African accession of Mentha Iongifolia （L.） Huds., a diploid species ancestral to cultivated peppermint and spearmint. The 353 Mb genome contains 35 597 predicted protein-coding genes, including 292 disease resistance gene homologs, and nine genes determining essential oil characteristics. A genetic linkage map ordered 1397 genome scaffolds on 12 pseudochromosomes. More than two million simple sequence repeats were identified, which will facilitate molecular marker development. The M. Iongifolia genome is a valuable resource for both metabolic engineering and molecular breeding. This is exemplified by employing the genome sequence to clone and functionally characterize the promoters in a peppermint cultivar, and demonstrating the utility of a glandular trichome-specific promoter to increase expression of a biosynthetic gene, thereby modulating essential oil composition.

关键词： aromatic plant essential oil genome mint Verticillium wilt