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Gallery of integrating factors for non-linear first-order differential equations 非线性一阶微分方程的积分因子库
Pub Date : 2021-12-30 DOI: 10.30538/psrp-easl2021.0077
A. Adu-Sackey, Gabriel Obed Fosu, B. Akuffo
This paper discusses a gallery of useful results in connection with integrating factors that are often left as problems for discovery learning and are generally not taught in typical Ordinary Differential Equations courses. Most often than not the approach earlier writers employ is to give a possible form for an integrating factor that may results in an integrating curve without practical prove as far as the subject matter is concerned. In this write-up, an attempt is made by solving the resulting partial differential equation emanating from an underlining general differential equation of a non-exact form, by the use of the ratio theorem to establish various intricate possibilities of integrating factors that are seldom and often relegated to the background, even though they may be equally be applied as a function of a unitary variable or a linear combination of both the dependent and independent variables under certain conditions. Granted an integrating factor is found and such a function applied, the benefit is enormous especially the non-exact differential equation reduces into a known type which may be identified as exact, homogeneous, and or separable that yields a solution.
本文讨论了一系列与积分因子有关的有用结果,这些积分因子通常是发现学习的问题,在典型的常微分方程课程中通常不会教授。早期作者通常采用的方法是给出积分因子的可能形式,该形式可能导致积分曲线,而就主题而言,没有实际证明。在这篇文章中,试图通过求解由一个非精确形式的突出的一般微分方程产生的偏微分方程,利用比率定理来建立积分因子的各种复杂可能性,这些因子很少而且经常被放在背景中,即使它们在某些条件下可以等同地作为酉变量的函数或因变量和自变量的线性组合来应用。如果找到了一个积分因子并应用了这样的函数,收益是巨大的,尤其是将非精确微分方程简化为已知类型,该类型可以被识别为精确的、齐次的和/或可分离的,从而产生解。
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引用次数: 0
The relationship between the energy efficiency of buildings and occupants: A review 建筑能源效率与居住者的关系综述
Pub Date : 2021-12-30 DOI: 10.30538/psrp-easl2021.0076
M. U. Farooq, Abdul Ahad, Zeeshan Maqsood, Niranjan Devkota, S. Naqi, Raza
Green buildings are supposed to provide a sustainable solution for energy usage, but their low performance raised some questions in the literature. The researchers determine that occupants are the key factor for this energy deficiency. In the last two decades, a stream of research focuses on the greening of occupants, but a synthesis of findings and results are absent in the literature. In this study, we reviewed the literature on green buildings and occupants. Based on the findings we classified four classes. The first class consists of green occupants and green buildings, which is the ideal solution for high-energy efficiency. The second class is of brown occupants and green buildings and is the prime reason behind outperformed green buildings and yields negative-medium level efficiency. The third class comprises green occupants and brown buildings and yields positive-medium level efficiency, which helps to start the journey towards sustainability. The fourth class is the combination of brown buildings and brown occupants and has the lowest efficiency and worst impact on the environment throughout the lifecycle. Further, we link these classes with the energy-saving efficiency of buildings and finally recommended an efficient solution for second and third world countries. The study contributes to green building literature and packed with managerial implications to gain the maximum benefits of green buildings.
绿色建筑应该为能源使用提供可持续的解决方案,但其低性能在文献中提出了一些问题。研究人员认为,居住者是造成这种能量不足的关键因素。在过去的二十年里,一系列的研究集中在绿化居住者上,但文献中缺乏综合的发现和结果。在本研究中,我们回顾了关于绿色建筑和居住者的文献。基于这些发现,我们将其分为四类。第一类由绿色居住者和绿色建筑组成,这是高能效的理想解决方案。第二类是棕色居住者和绿色建筑,这是表现优于绿色建筑并产生负中等效率的主要原因。第三类包括绿色居住者和棕色建筑,并产生正中等水平的效率,这有助于开始可持续发展的旅程。第四类是棕色建筑和棕色居住者的组合,在整个生命周期中效率最低,对环境的影响最大。此外,我们将这些类别与建筑物的节能效率联系起来,最后为第二和第三世界国家推荐了一种有效的解决方案。该研究为绿色建筑文献做出了贡献,并具有管理意义,以获得绿色建筑的最大效益。
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引用次数: 1
Digital high-speed data modulation techniques 数字高速数据调制技术
Pub Date : 2021-12-30 DOI: 10.30538/psrp-easl2021.0075
W. T. Ireeta, Esther Nabadda, G. Isoe
Most radio stations use frequency modulation (FM) to broadcast yet amplitude modulation (AM) ensures long distance modulation. The limitations of FM reception are the line of sight and the area of reception. These two parameters are much smaller in FM compared to AM which makes AM modulation have an added advantage over FM modulation. The results presented in this paper include; direct modulation at different bias currents and different transmission fiber lengths and the amplitude modulation using the Mach-Zehnder. The results show the possibility to transmit huge data at high speeds to over 100Gbps.
大多数无线电台使用调频(FM)广播,但调幅(AM)确保长距离调制。调频接收的限制是视线和接收面积。与调幅调制相比,调幅调制的这两个参数要小得多,这使得调幅调制比调频调制具有额外的优势。本文的研究结果包括:在不同的偏置电流和不同的传输光纤长度下直接调制和使用马赫-曾德尔调幅。结果显示,以超过100Gbps的高速传输大量数据是可能的。
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引用次数: 0
Predicting COVID-19 cases, deaths and recoveries using machine learning methods 使用机器学习方法预测新冠肺炎病例、死亡和康复
Pub Date : 2021-12-30 DOI: 10.30538/psrp-easl2021.0079
M. Lounis, F. Khan
In the presented work we applied three machine learning techniques to forecast and predict COVID-19 cases, deaths ad recoveries numbers in Algeria for the next six months using data from February 25th, 2020 to April 26th , 2021. These models are represented by the Gaussian process regression (GPR), the support vector machine (SVM) and the decision tree (DT). The plotting results and parameters evaluation pointed out that the Gaussian Process Regression (GPR) has the best performance. Prediction with this model showed that the number of cases, deaths and recoveries will increase in the next months Algeria recording a peak in the month of August and the curve will tend to decrease later.
在所介绍的工作中,我们使用2020年2月25日至2021年4月26日的数据,应用三种机器学习技术预测和预测阿尔及利亚未来六个月的新冠肺炎病例、死亡和康复人数。这些模型由高斯过程回归(GPR)、支持向量机(SVM)和决策树(DT)表示。绘图结果和参数评估表明,高斯过程回归(GPR)具有最好的性能。该模型的预测显示,未来几个月,阿尔及利亚的病例数、死亡人数和康复人数将增加,8月份将达到峰值,此后曲线将趋于下降。
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引用次数: 5
Dependence of reflectance on angular deposition and film thickness of ZnS/Ag nanolayers 反射率对ZnS/Ag纳米层角沉积和膜厚的影响
Pub Date : 2021-12-30 DOI: 10.30538/psrp-easl2021.0078
E. Bwayo, W. Okullo, D. Mukiibi, D. Okello, Robert Lugolole, Tumps. W. Ireeta
This paper presents the spectral reflectance of thermally evaporated ZnS/Ag nanostructures. The coating of ZnS/Ag nanostructures was performed in two steps while varying the film thickness and deposition angle. Silver metal wire (99.99% purity) was heated under vacuum at a pressure of (2.5 times 10^{-5}) mBars and deposited on glass slide substrates in the diffusion pump microprocessor vacuum coater (Edwards AUTO 306). Pieces of zinc sulphide (99.99% purity) were heated and deposited to the glass slides previously coated with silver to form the ZnS/Ag/glass composite. The optical reflectance of the samples was studied by the UV/Vis/NIR spectrometer (Perkin Elmer Lambda 19) with UV-WinLab software. The reflectance was measured at angles of incidence between (15^o) and (75^o). Spectrophotometric studies showed that reflectance decreased with decrease in film thickness and decreased with increase in deposition angle of silver nanoparticles. The reflectance of ZnS/Ag nanostructures decreased with increase in deposition angle of zinc sulphide.
本文研究了热蒸发ZnS/Ag纳米结构的光谱反射率。在不同的膜厚和沉积角度下,分两步完成了ZnS/Ag纳米结构的镀层。银金属线(99.99% purity) was heated under vacuum at a pressure of (2.5 times 10^{-5}) mBars and deposited on glass slide substrates in the diffusion pump microprocessor vacuum coater (Edwards AUTO 306). Pieces of zinc sulphide (99.99% purity) were heated and deposited to the glass slides previously coated with silver to form the ZnS/Ag/glass composite. The optical reflectance of the samples was studied by the UV/Vis/NIR spectrometer (Perkin Elmer Lambda 19) with UV-WinLab software. The reflectance was measured at angles of incidence between (15^o) and (75^o). Spectrophotometric studies showed that reflectance decreased with decrease in film thickness and decreased with increase in deposition angle of silver nanoparticles. The reflectance of ZnS/Ag nanostructures decreased with increase in deposition angle of zinc sulphide.
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引用次数: 0
Hermite-Hadamard type inequalities for (n)-polynomial generalized convex functions of Raina type and some related inequalities (n) -多项式Raina型广义凸函数的Hermite-Hadamard型不等式及相关不等式
Pub Date : 2021-09-30 DOI: 10.30538/psrp-easl2021.0074
S. Butt, M. Tariq, Muhammad Nadeem
In this paper, we introduce the concept of a new family of convex functions namely n-polynomial generalized convex functions of Raina type. We investigate the algebraic properties of a newly introduced idea and discuss their connections with convex functions. Furthermore, we establish the new version of Hermite–Hadamard and some refinements of Hermite-Hadamard type inequalities this class of functions. Finally, we investigate some applications to special means of real numbers. Results obtained in this paper can be viewed as a significant improvement of previously known results and also may stimulate and energize for further activities in this research area field.
本文引入了一类新的凸函数的概念,即n多项式的Raina型广义凸函数。研究了一个新引入思想的代数性质,并讨论了它与凸函数的联系。在此基础上,建立了新版本的Hermite-Hadamard不等式,并对该类函数的Hermite-Hadamard型不等式进行了改进。最后,讨论了实数特殊均值的一些应用。本文所获得的结果可以看作是对先前已知结果的重大改进,也可以为该研究领域的进一步活动提供激励和动力。
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引用次数: 0
Renewable energy policy around the globe 全球可再生能源政策
Pub Date : 2021-09-30 DOI: 10.30538/psrp-easl2021.0073
A. Mahmood, Muhammad Qasim, Muhammad Faisal Khan
Renewable energy systems (RESs) have an inherent quality of achieving independence Vis a Vis useful energy harnessing for self or localized use. At larger scale the renewable energy system allows the power generation and distribution without a significant harm to the environment. Propagation and proliferation of RESs and the Renewable Energy Technology (RET), collectively demand an effective policy making infrastructure to be in place to ensure their penetration locally and globally. Renewable Energy Policies have a great impact on how readily these systems are adopted by the investors and market, how efficient these systems are which is dependent on the research and development (R&D) of RESs, how effectively the country or region copes with the scourge of environmental harm with the use of RESs. Renewable Energy Policies also have an impact on how costly these technologies are and how these technologies fiscally benefit common man, investors and industries. Efficiency enhancement, stability and intelligent management of grids integrated with RES are also renewable policy dependent. This paper thoroughly and critically examines the importance of renewable energy policy. not just at domestic or national level but also at global level. It discusses in detail the core ingredients of renewable energy policy which were adopted in the past, which are being adopted now and which should be adopted in future. This paper also discusses policy, business and financial models; importance of tariff formulation, incentives and subsidies and a few factors which may pose a risk to the development and adoption of RESs. At the end a few suggestions have also been made which, if adopted, would help promote the RESs proliferation across the globe at a rapid pace and would ensure energy security, sustainable development and environmental conservation.
可再生能源系统(RESs)具有一种内在的品质,即实现独立于自身或局部使用的有用能源利用。在更大的范围内,可再生能源系统允许发电和分配,而不会对环境造成重大危害。可再生能源技术和可再生能源技术(RET)的传播和扩散共同需要一个有效的政策制定基础设施,以确保它们在当地和全球的渗透。可再生能源政策对这些系统是否容易被投资者和市场采用,这些系统的效率如何取决于可再生能源的研发(R&D),以及国家或地区如何有效地应对使用可再生能源的环境危害的祸害有很大的影响。可再生能源政策也会影响这些技术的成本,以及这些技术如何在财政上给普通人、投资者和行业带来好处。与可再生能源相结合的电网的效率提高、稳定性和智能管理也依赖于可再生能源政策。本文全面而批判性地考察了可再生能源政策的重要性。不仅在国内或国家层面,而且在全球层面。它详细讨论了过去采用的可再生能源政策的核心成分,现在正在采用的和将来应该采用的。本文还讨论了政策模式、业务模式和财务模式;关税制定、奖励和补贴的重要性,以及可能对发展和采用可持续经济体系构成风险的几个因素。最后,提出了几点建议,如果这些建议得到采纳,将有助于促进可再生能源在全球范围内的快速扩散,并将确保能源安全、可持续发展和环境保护。
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引用次数: 0
The power of visual analytics and language processing to explore the underlying trend of highly popular song lyrics 视觉分析和语言处理的力量,探索高度流行的歌词的潜在趋势
Pub Date : 2021-09-30 DOI: 10.30538/psrp-easl2021.0072
Tanish Maheshwari, Tarpara Nisarg Bhaveshbhai, Mitali Halder
The number of songs are increasing at a very high rate around the globe. Out of the songs released every year, only the top few songs make it to the billboard hit charts .The lyrics of the songs place an important role in making them big hits combined with various other factors like loudness, liveness, speech ness, pop, etc. The artists are faced with the problem of finding the most desired topics to create song lyrics on. This problem is further amplified in selecting the most unique, catchy words which if added, could create more powerful lyrics for the songs. We propose a solution of finding the bag of unique evergreen words using the term frequency-inverse document frequency (TF-IDF) technique of natural language processing. The words from this bag of unique evergreen words could be added in the lyrics of the songs to create more powerful lyrics in the future.
歌曲的数量在全球范围内以非常高的速度增长。在每年发布的歌曲中,只有前几首歌曲登上了公告牌热门歌曲排行榜。歌曲的歌词在使其成为热门歌曲方面发挥着重要作用,再加上其他各种因素,如响度、活跃度、演讲能力、流行度等。艺术家们面临着找到最想要的主题来创作歌词的问题。这个问题在选择最独特、最朗朗上口的词时得到了进一步的放大,如果添加这些词,可以为歌曲创作出更有力的歌词。我们提出了一种利用自然语言处理的词频逆文档频率(TF-IDF)技术来寻找独特的常青词袋的解决方案。这袋独特的常青词中的单词可以添加到歌曲的歌词中,以在未来创造更强大的歌词。
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引用次数: 0
Integrated interpretive structural modeling (ISM) and MICMAC diagram for analysis of infrastructure influence in supporting submarine operations 综合解释结构建模(ISM)和MICMAC图分析支持潜艇作战的基础设施影响
Pub Date : 2021-09-06 DOI: 10.30538/psrp-easl2021.0071
Moelyanto Moelyanto, Marsetio Marsetio, A. Octavian, R. O. Bura, I. Putra
The strategic value of the Navy's submarine capabilities is greatly influenced by the ability of its supporting infrastructure to be able to maintain the confidentiality of submarine operations. Based on these conditions, this study aims to identify and analyze the operational readiness of submarines to increase the deterrence of the state defense system at sea. This study uses Interpretive Structural Modeling (ISM) and MIC-MAC diagrams. The ISM method is used to analyze the effect on the criteria. MICMAC diagrams are used as criteria for determining the related variables. Based on the results of the ISM and MICMAC diagram analysis, it was found that fifteen elements were divided into (4) (four) quadrants. Quadrant I (Autonomous) consists of six elements, such as ((C_1)), ((C_2)), ((C_3)), ((C_4)), ((C_{13)}), ((C_{15})). Quadrant II (Dependent) consists of six elements, such as ((C_5)), ((C_6)), ((C_7)), ((C_{11})), ((C_{12})), ((C_{14})). Quadrant IV (Independent) consists of three elements, such as ((C_8)), ((C_9)), ((C_{10})). This research is expected to provide benefits to both academics and practitioners in the field of submarines and defense strategy.
海军潜艇能力的战略价值在很大程度上受到其支持基础设施保持潜艇行动机密性的能力的影响。基于这些条件,本研究旨在识别和分析潜艇的战备状态,以提高国家防御系统在海上的威慑力。本研究使用解释结构建模(ISM)和MIC-MAC图。ISM方法用于分析对准则的影响。MICMAC图被用作确定相关变量的标准。根据ISM和MICMAC图的分析结果,发现15个元素被划分为4个象限。象限I(自治)由六个元素组成,如(((C_1))、((C_2。象限II(从属)由六个元素组成,如(((C_5))、((C_6。象限IV(独立)由三个元素组成,如(((C_8))、((C_9))和((C_{10}))。这项研究有望为潜艇和国防战略领域的学者和从业者带来好处。
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引用次数: 0
Strongest relation, cosets and middle cosets of (AQFSC(G)) 的最强关系,协集和中协集 (AQFSC(G))
Pub Date : 2021-08-12 DOI: 10.30538/psrp-easl2021.0070
R. Rasuli
The aim of this paper is to introduce strongest relation, cosets and middle cosets of anti (Q)-fuzzy subgroups of (G) with respect to (t)-conorm (C.) We investigate equivalent characterizations of them and we construct a new group induced by them, and give the homomorphism theorem between them.
本文的目的是引入(G)的反(Q)-模糊子群关于(t)-锥型(C)的最强关系、陪集和中间陪集。我们研究了它们的等价刻画,构造了由它们诱导的一个新群,并给出了它们之间的同态定理。
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引用次数: 0
期刊
Engineering and Applied Science Letters
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