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Optical and Electrical Performance Analysis of InGaAs/InP Laser for Various Crystal Orientations 不同晶体取向InGaAs/InP激光器的光电性能分析
Pub Date : 2022-03-01 DOI: 10.24203/ajet.v10i1.6925
Maad M. Mijwil
The optoelectronic achievement of a lattice matching InGaAs/InP lateral cavity surface radiating LASER in crystal orientations (100), (110), (111), (113), and (131) is computationally simulated utilising MATLAB by attempting to solve a k.p Hamiltonian of eight-band utilising only a finite difference strategy with spin-orbit linkage. To shift wave-vector k as well as Hamiltonian from traditional (100) plane orientation, tensor plane revolution equations are used. It is demonstrated that optical emission spectrum and crystal plane alignments have a significant correlation. At a carriers injection density of 2.50 x 1018 per cm3, the maximum and minimum gains are measured in the (111) as well as (100) orientations, respectively, with optimum emission wavelengths of 1770.00nm and 1680.00nm. This research will serve as a catalyst for the development of ultra-fast optoelectronic devices with improved performance thanks to the use of non-100 orientation epitaxial layers.
利用MATLAB对晶体(100)、(110)、(111)、(113)、(131)取向的InGaAs/InP侧腔面在(100)、(110)、(111)、(113)和(131)上的晶格匹配的光电实现进行了计算模拟,试图仅利用自旋轨道联动的有限差分策略求解八波段的k.p哈密顿量。为了将波矢量k和哈密顿量从传统的(100)平面方向上移开,使用了张量平面旋转方程。结果表明,光学发射光谱与晶体平面排列具有显著的相关性。在载流子注入密度为2.50 x 1018 / cm3时,在(111)和(100)方向分别测量到最大和最小增益,最佳发射波长为1770.00nm和1680.00nm。由于使用了非100取向外延层,这项研究将成为开发超高速光电器件的催化剂,并提高其性能。
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引用次数: 2
The Development of Practice in Permeation Grouting by using Fine-grained Cement Suspensions 细粒水泥悬浮液渗透注浆的实践进展
Pub Date : 2021-12-31 DOI: 10.24203/ajet.v9i6.6846
D. Christodoulou, P. Lokkas, A. Droudakis, X. Spiliotis, D. Kasiteropoulou, N. Alamanis
Grouting includes a range of processes that involve the injection of wet or dry materials into the ground to provide improved engineering properties. Common aims are to increase strength or stiffness or to reduce permeability within the mass of ground treated. This paper, mainly, addresses permeation grouting for the improvement of soils, in terms of strengthening or reduction of permeability, and compensation grouting for the displacement of structures during subsurface exploration. The grouts used to make permeation grouting are suspensions and chemical solutions. The suspensions penetrate well into soils with granulometry up to coarse sand. On the contrary, the chemical solutions penetrate satisfactorily in finer formations up to fine sands or coarse sludges. Because some chemical solutions are toxic or generally harmful to the environment and humans, an effort has been made internationally in recent years to replace them with inorganic fine-grained suspensions.
灌浆包括一系列过程,包括将湿材料或干材料注入地面,以改善工程性能。通常的目的是增加强度或刚度或降低处理过的地面的渗透性。本文主要介绍了改善土壤的渗透注浆、增强或降低渗透的注浆以及地下勘探过程中结构位移的补偿注浆。用于渗透灌浆的浆液是悬浮液和化学溶液。这些悬浮液能很好地渗透到颗粒级土壤中,甚至可以渗透到粗砂中。相反,化学溶液能很好地渗透到细砂或粗污泥等较细的地层中。由于一些化学溶液有毒或对环境和人类有害,近年来国际上正在努力用无机细颗粒悬浮液取代它们。
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引用次数: 3
Experimental Study on Effect of Addition of Different Salts on Distribution of Aniline between Water and Toluene 不同盐的加入对苯胺在水-甲苯间分布影响的实验研究
Pub Date : 2021-11-05 DOI: 10.51983/ajeat-2021.10.2.2947
S. J. Wagh, Shaktisingh G. Raulji, Sathish Gaddam
The aim of this experimental work was to know the effect of addition of certain inorganic salts on removal of aniline from water by using toluene as the extracting solvent. The inorganic salts used were NaCl, KI, and MgCl2·6H2O. The influence of factors such as amount of salt, phase volume ratio, initial aniline concentration in feed-water solution, and temperature on the distribution of aniline was investigated. It was found that addition of 5% NaCl shows an appreciable salting-out effect on distribution of aniline. It was also found that the distribution of aniline was favoured at low aniline concentrations, and a phase volume ratio of toluene to water of little above 1.0. It is also found that the dissociation of salt added plays an important role in aniline extraction and the effect of cation and/or anion as predicted by the Hofmeister series may not be always followed in all cases. The distribution of aniline between water and toluene is found to be endothermic in nature.
本实验工作的目的是了解以甲苯为萃取溶剂,加入某些无机盐对水中苯胺脱除的影响。所用无机盐为NaCl、KI和MgCl2·6H2O。考察了投盐量、相体积比、进水初始苯胺浓度、温度等因素对苯胺分布的影响。结果表明,5% NaCl的加入对苯胺的分布有明显的盐析作用。当苯胺浓度较低,甲苯与水的相体积比略高于1.0时,苯胺的分布更有利。研究还发现,盐的离解作用在苯胺的提取过程中起着重要的作用,而霍夫迈斯特级数所预测的正离子和阴离子的作用并不是在所有的情况下都适用。苯胺在水和甲苯之间的分布在本质上是吸热的。
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引用次数: 0
A New Viewpoint and Outlook on Aryl Mercaptans as Strong Nucleophiles with Various Chain Length Linked to DNA/RNA and Cadmium Oxide (CdO) Nanoparticles Sandwiched Complex 芳基硫醇作为不同链长的强亲核试剂与氧化镉(CdO)纳米颗粒夹心配合物的新观点与展望
Pub Date : 2021-11-05 DOI: 10.51983/ajeat-2021.10.2.3073
A. Heidari
CdO nanoparticles show a strong peak of Plasmon absorption in ultraviolet–visible zone. A strong interaction exists between the surface of CdO nanoparticles and aryl mercaptan compounds. Aryl mercaptan compounds cause to aggregation of CdO nanoparticles linked to DNA/RNA and hence, lead to widening of peak Plasmon of CdO nanoparticles surface at 550 (nm) and emerging a new peak at higher wavelength. In the current project, this optical characteristic of CdO nanoparticles is used to time investigate of interaction between different aryl mercaptanes and CdO nanoparticles. The results were shown that aryl mercaptan compounds with shorter chain length interact faster with CdO nanoparticles. Therefore, a simple and fast method for identification of aryl mercaptanes with various chain length using red shift in surficial Plasmon absorption is presented.
纳米CdO在紫外可见区有很强的等离子体吸收峰。CdO纳米颗粒表面与芳基硫醇化合物之间存在很强的相互作用。芳基硫醇类化合物引起与DNA/RNA连接的CdO纳米颗粒聚集,从而导致CdO纳米颗粒表面等离子体激元在550 (nm)处变宽,并在更高波长处出现新峰。本项目利用纳米CdO的光学特性,对不同芳基硫醇与纳米CdO之间的相互作用进行了时间研究。结果表明,链长较短的芳基硫醇类化合物与CdO纳米颗粒的相互作用更快。因此,提出了一种利用表面等离子体吸收红移快速鉴别不同链长的芳基硫醇的方法。
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引用次数: 0
Aerodynamic Analysis of Micro Aerial Vehicle Rotor Blade at Low Reynolds Number 微型飞行器低雷诺数旋翼叶片气动特性分析
Pub Date : 2021-11-05 DOI: 10.51983/ajeat-2021.10.2.2953
M. Kamruzzaman, Sushil Nepal, Mushfiq Al Arafa
The numerical simulation of micro aerial vehicle (MAV) rotor blade aerodynamics is highly challenging in the field of rotor aerodynamics. The aim of this paper is to present a computational fluid dynamics (CFD) study on the aerodynamics analysis of micro aerial vehicle rotor blade at low-Reynolds number by means of Spalart-Allmaras turbulence model. The KA152313 airfoil, which is dedicated to mid to small-scale rotorcraft, e.g. MAV is chosen to design the rotor blade. The rotor blade was investigated in three different pitch configurations, which are GP13º, GP12º and GP11º and the aerodynamics characteristics are analyzed respectively. The CFD results of the analysis is used to compare the aerodynamic characteristics, e.g. pressure force, shear force and pitching moment on the chord surface of the rotor blades at different pitch configurations.
微型飞行器(MAV)旋翼叶片空气动力学的数值模拟是旋翼空气动力学研究领域中极具挑战性的课题。本文的目的是利用Spalart-Allmaras湍流模型对低雷诺数下微型飞行器旋翼叶片的空气动力学进行计算流体力学(CFD)研究。KA152313翼型,这是专门为中小型旋翼机,如MAV选择设计旋翼叶片。研究了GP13º、GP12º和GP11º三种不同节距构型下的动叶,并对其气动特性进行了分析。利用CFD分析结果比较了不同节距配置下动叶弦面压力力、剪切力和俯仰力矩等气动特性。
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引用次数: 0
Fast Implementation of the Rivest-Shamir-Adleman (RSA) Algorithm with Robust Packet Data Loss Detection Function 具有鲁棒数据包丢失检测功能的RSA (Rivest-Shamir-Adleman)算法的快速实现
Pub Date : 2021-11-05 DOI: 10.51983/ajeat-2021.10.2.3058
Alhassan Abdul-Barik, Issah Mubasir, A. Salamudeen
Encryption is the process of protecting information from unauthorized parties by converting such information into an unreadable form. Packet data is a method of transferring data, broken into bits called packets which travels over a network. Packet losses occur when packets fail to reach their destination devices as a result of network congestion, faulty routers or as a result of an attack. Encryption is the standard method for making a communication private. In sending a private message to another user, it is first encrypted (termed encipher), the intended recipient alone knows how to correctly decrypt (decipher) the message. There are several algorithms developed for the purpose of encryption which provides data security and integrity. This paper proposes the use of the Rivest-Shamir-Adleman (RSA) algorithm to implement a system for encrypting text files of any length (by breaking long messages into valid blocks and encrypting each block) capable of being transmitted using a Simple Mail Transfer Protocol (SMTP). Probable primes, 3048 bits in length are generated to be used in the generation of public, private key pairs for encryption and decryption. The proposed scheme is better because the route taken during transmission of data is recorded and packet losses are also checked for during transmission of encrypted files as compared to known state-of-the-art schemes.
加密是通过将信息转换为不可读的形式来保护信息不受未经授权方的攻击的过程。分组数据是一种传输数据的方法,它被分解成称为分组的比特,在网络上传播。由于网络拥塞、路由器故障或受到攻击,报文无法到达目的设备时,就会出现丢包。加密是使通信保密的标准方法。在向另一个用户发送私有消息时,它首先被加密(称为加密),只有预期的接收者知道如何正确地解密(解密)消息。为了提供数据的安全性和完整性,有几种算法被开发出来。本文提出使用RSA (Rivest-Shamir-Adleman)算法来实现一个能够使用简单邮件传输协议(SMTP)传输的任何长度的文本文件加密系统(通过将长消息分解为有效块并加密每个块)。生成长度为3048位的可能素数,用于生成用于加密和解密的公钥、私钥对。与目前最先进的方案相比,所提出的方案更好,因为在传输数据时所采取的路由被记录下来,并且在传输加密文件时也会检查数据包丢失。
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引用次数: 1
The Cyber Attack on Saudi Aramco in 2012 2012年对沙特阿美公司的网络攻击
Pub Date : 2021-11-05 DOI: 10.51983/ajeat-2021.10.2.3057
Alaa Alsaeed
In recent years, information security has become a corporate priority due tothe large number of cyber-attacks that happen every day. These attacks could cause a regression in economic growth, which makes corporations another reason to defend their system. This paper provides an introduction to Saudi Aramco as well as an overview of its products. Then, the paper examines the Aramco cyber-attack in 2012. Aramco is a massive company with huge facilities that require powerful policies on security. Aramco should implement a Redundant Array of Independent Disks and Intrusion Detection System and review the log files on the server to protect its servers against attacks.
近年来,由于每天都有大量的网络攻击发生,信息安全已成为企业的首要任务。这些攻击可能会导致经济增长的倒退,这让企业有了另一个保护自己系统的理由。本文提供了一个介绍沙特阿美公司,以及其产品的概述。然后,本文分析了2012年沙特阿美石油公司遭受的网络攻击。沙特阿美是一家规模庞大的公司,拥有庞大的设施,需要强有力的安全政策。阿美公司应实施独立磁盘冗余阵列和入侵检测系统,并检查服务器上的日志文件,以保护其服务器免受攻击。
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引用次数: 0
Design and Development of an Enlightening Grid Evidence Jamboree for Modified Ontology in Consumer Outlines 消费者轮廓中改进本体的启发性网格证据大会的设计与开发
Pub Date : 2021-11-05 DOI: 10.51983/ajeat-2021.10.2.3063
S. Ravichandran, A. P. Babu, P. Saravanan
As an ideal for understanding portrayal and reinforcement, ontologies are broadly exhausted toward signify consumer outlines inside customized net info amassing.  Though, whilst expressive person outlines, numerous fashions have exploited most effective know-how from either an international know-how sordid or a consumer insular data. Inside that article, a customized ontology version is projected pro expertise illustration and intellectual done consumer outlines. That paradigm absorbs ontological consumer outlines from each a global expertise ignoble and person neighborhood example   sources.   This   ontology version is assessed through evaluating it in opposition to yardstick fashions inside net info jamboree. These consequences display that this ontology archetypal is an effective.
作为理解刻画和强化的理想方法,本体被广泛地用于表示自定义网络信息积累中的消费者轮廓。虽然,在富有表现力的人概述的同时,许多时尚已经从国际知识市场或消费者狭隘的数据中利用了最有效的知识。在这篇文章中,一个定制的本体版本是投影的专业知识插图和智能完成的消费者轮廓。该范式从每一个全球专业知识和人的邻里例子来源吸收本体论的消费者轮廓。该本体版本是通过对比网络信息大会中的尺度模型来评估的。这些结果表明该本体原型是有效的。
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引用次数: 0
Review on Preservation of Post-Harvest Vegetables by Using Evaporative Cooling Method 采后蔬菜蒸发冷却保鲜研究进展
Pub Date : 2021-11-05 DOI: 10.51983/ajeat-2021.10.2.3097
A. Husainy, Prasad Sawant, Sayeedahmed M. Yusuf Shaikh, Om Shashikant Virbhadre, Mayuresh Sanjay Tone
Proper storage of vegetables, fruits and food items is necessary in order to maintain their life. The shelf life of vegetables is highly dependent on temperature and humidity in storage place. Cold room and refrigeration facilities are out of budget due to advance technologies and high electricity consumption. Affordable storage facility is highly useful in such conditions. The paper aims at developing low cost, small scale evaporative cooler that operates on a principle of evaporative cooling phenomenon. The developed model has box type of structure having water holding vessel at bottom side. The proposed model has cooling fan arranged for vertical orientation with certain height partial closed as well as medium height between cooling chamber and storage chamber. The fan has been operated at two speed variants namely low speed as well as high speed for getting results at different evaporation rates. Throttling vanes have been provided through the air entering chamber which significantly affects evaporation capacity of the evaporative box. In the given range of 270 minutes of operating time during two time slots i.e.,morning and afternoon. Humiditypercentage increase from 26 to 60 is found through the experimentation while the temperature difference was reduced down to 8 degrees of difference (40 ⁰C to 32 ⁰C) through experimentation. The performance of the developed model was found better in case of throttling with fan speed parameter that includes partial throttling at high speed and medium throttling at low speed.
为了维持蔬菜、水果和食品的生命,适当的储存是必要的。蔬菜的保质期在很大程度上取决于储存地点的温度和湿度。由于先进的技术和高用电量,冷藏室和冷藏设施超出了预算。在这种情况下,负担得起的存储设施非常有用。本文旨在研制低成本、小型的利用蒸发冷却原理的蒸发冷却器。所开发的模型为箱式结构,底部有装水容器。所述模型冷却风扇垂直布置,高度部分封闭,冷却室与储存室之间高度中等。风机在低速和高速两种转速下运行,以便在不同的蒸发速率下获得结果。节流叶片通过空气进入室,这显著影响蒸发箱的蒸发能力。在给定的270分钟的工作时间范围内,即上午和下午两个时间段。通过实验发现湿度百分比从26增加到60,而温差通过实验减少到8度(40⁰C到32⁰C)。结果表明,在采用风扇转速参数进行高速部分节流和低速中等节流的情况下,该模型具有较好的性能。
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引用次数: 0
Is ICT a Prospect for Young Professionals to Mature Business Within SME`s in East Africa Community? 信息通信技术是青年专业人员在东非中小企业成熟业务的前景吗?
Pub Date : 2021-11-04 DOI: 10.24203/ajet.v9i5.6772
Murtaza Hussain Shaikh, Isabelle Habineza
Nowadays, young individuals in the East African community are using information and communication technologies in different ways, some as an opportunity to make a conversation with relatives and others take it as a distraction. Information and communication technology is an opportunity for young individuals to grow businesses. Young professionals need to investigate in small and medium-sized enterprises and should not only expect to get jobs elsewhere. The issue is that young professionals in the East African community cannot compete with each other when their mindset on doing business through small and medium-sized enterprises are taken differently and the levels of economic of these countries are very different. This article is motivated by the researcher’s observation analysis about young professionals in the East Africa community who know information and communication technologies, and unfortunately, they use them in a way that cannot make small and medium-sized enterprises successful. The main goal of this study is to describe information and communication technologies as an opportunity to buy or sell goods or services through small and medium-sized enterprises. This study will provide a better understanding to the lecturer, especially young professionals to take information and communication technologies positively as an opportunity to grow business through small and medium-sized enterprises and to know the strategy to use to sell products and how to manage consumer’s behavior through their needs. Young professionals need to build business skills and linkages with local and international businesses by exchanging business ideas and information via information and communication technologies.
如今,东非社区的年轻人正以不同的方式使用信息和通信技术,有些人将其作为与亲戚交谈的机会,有些人则将其作为消遣。信息和通信技术是年轻人发展事业的机会。年轻的专业人士需要到中小企业去考察,不要只指望在其他地方找到工作。问题是,东非社区的年轻专业人士无法相互竞争,因为他们对通过中小企业开展业务的心态不同,这些国家的经济水平也大不相同。这篇文章的动机是研究人员对东非社区的年轻专业人员的观察分析,他们了解信息和通信技术,不幸的是,他们以一种无法使中小企业成功的方式使用它们。本研究的主要目标是将信息和通信技术描述为通过中小企业购买或销售商品或服务的机会。本研究将提供一个更好的理解讲师,特别是年轻的专业人士,积极地把信息和通信技术作为一个机会,通过中小企业发展业务,并知道使用的策略来销售产品和如何管理消费者的行为,通过他们的需求。年轻的专业人士需要透过资讯及通讯科技,与本地及国际商界交流商业意念和资讯,建立商业技能及联系。
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引用次数: 1
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Asian Journal of Engineering and Applied Technology
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