International Journal of Mathematics and Physics最新文献_第9页

Energy-Efficient Operation of PV-T Solar Collectors with Heat Pump based Water Heaters Suitable for Domestic Applications 适用于家用热泵热水器的PV-T太阳能集热器的节能运行

International Journal of Mathematics and Physics Pub Date : 2021-06-01 DOI: 10.26577/ijmph.2021.v12.i1.02

A. James, S. Jayaraj, M. Srinivas, M. Mohanraj

{"title":"Energy-Efficient Operation of PV-T Solar Collectors with Heat Pump based Water Heaters Suitable for Domestic Applications","authors":"A. James, S. Jayaraj, M. Srinivas, M. Mohanraj","doi":"10.26577/ijmph.2021.v12.i1.02","DOIUrl":"https://doi.org/10.26577/ijmph.2021.v12.i1.02","url":null,"abstract":"A photovoltaic-thermal (PV-T) hybrid collector evaporator was designed and developed to produce electrical energy and extract thermal energy simultaneously from the panel using the refrigerant circulated the evaporator tubes. The refrigerant absorbs the heat from photovoltaic panels during its phase change from liquid to vapour. The PV-T evaporators deliver both electricity and heat outputs. An R-32 refrigerant-based solar-assisted heat pump water heating system with a rated heat output of 4 kW was developed and tested its performance for producing 150-200 litres of hot water at an average temperature of 60oC. The R-32 refrigerant is selected because it does not have any ozone depletion potential (ODP), and possess very low global warming potential (GWP). The heat pump evaporator was designed to absorb 3.25 kW heat from the panel and maintains the panel below 30oC. The average PV electricity output was 6 kWh, and the requirement was 3.5 kWh. The average excess power of 2.5 kWh has been supplied to the grid, and the average coefficient of performance (COP) of the system was 6.3. For a life span of 25 years, the total equivalent warming impact analysis (TEWI) resulted in a CO2 value of 15,543 kg, which is very much lower than that of conventional systems. The economic analysis performed was reported, and the system is found to be quite suitable for domestic applications and also economically feasible with a payback period of 2.5 years. \u0000Keywords: Solar PV-T Collectors, VFD Compressor, Domestic Water Heating.","PeriodicalId":40756,"journal":{"name":"International Journal of Mathematics and Physics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46614056","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Top-quark physics in hadronic collisions 强子碰撞中的顶夸克物理

International Journal of Mathematics and Physics Pub Date : 2021-06-01 DOI: 10.26577/ijmph.2021.v12.i1.09

E. Boos, V. Bunichev, G. Nurbakova, N. Habyl, S. Rustembayeva, D. Temirkhanova

引用次数: 0

Transition to mammography in the regular computed tomography simulation and reconstruction software 在常规计算机断层扫描模拟和重建软件中过渡到乳房X射线照相术

International Journal of Mathematics and Physics Pub Date : 2021-06-01 DOI: 10.26577/ijmph.2021.v12.i1.011

A. Kussainov, M. Em, E. T. Myrzabek, E. T. Salavatova, S. T. Zhaldybayev, Y. V. White

{"title":"Transition to mammography in the regular computed tomography simulation and reconstruction software","authors":"A. Kussainov, M. Em, E. T. Myrzabek, E. T. Salavatova, S. T. Zhaldybayev, Y. V. White","doi":"10.26577/ijmph.2021.v12.i1.011","DOIUrl":"https://doi.org/10.26577/ijmph.2021.v12.i1.011","url":null,"abstract":"This paper presents a modification of the previously developed and maintained computed tomography simulation and reconstruction software for the mammography case. New additional modules are designed to process the mammography data. Mammography provides incomplete information about the subject taken from the limited number points of view but as a result has potentially minimized exposure to radiation for the biological tissue under study. We implement this method by providing new standalone independent mammography modules in our software package. These modules are responsible for creating the projections’ set according to the operator’s input of exposure angles, phantom’s structure, and other multiple recording parameters. These additional modules reconstruct the data from these generated sets of projections or take the real medical data as input. Contrast and features’ recognition are particularly important elements of the study due to the limited number of projections in set. Our software could be used in combination with any real commercial mammography scanner as well as for research purposes to train medical and physics personnel and study for novel methods of contrast and image enhancement.","PeriodicalId":40756,"journal":{"name":"International Journal of Mathematics and Physics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46352410","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Inflation in modified quantum gravity with a fermion field 费米子场下修正量子引力中的暴胀

International Journal of Mathematics and Physics Pub Date : 2021-06-01 DOI: 10.26577/ijmph.2021.v12.i1.010

Sh.R. Myrzakulov, Y. Myrzakulov, R. Yechshanova, М. Imankul

{"title":"Inflation in modified quantum gravity with a fermion field","authors":"Sh.R. Myrzakulov, Y. Myrzakulov, R. Yechshanova, М. Imankul","doi":"10.26577/ijmph.2021.v12.i1.010","DOIUrl":"https://doi.org/10.26577/ijmph.2021.v12.i1.010","url":null,"abstract":"Viable inflation of modified nonuniform isotropic F(R) gravity with a fermionic field of f-essence is investigated using the quantum approach. The action of which is S=int [], where R is the curvature scalar, and Lm is the matter Lagrangian. In this case, we consider a non-minimally coupled fermionic field f-essence, the Lagrangian of which is denoted by K(Y,u) by a function depending on Y-kinetic and u potential arguments. The equations of motion of this model are obtained for the homogeneous and isotropic Friedman-Robertson-Walker space-time. As F(R) we consider the generalized Horava-Lifshitz quantum gravity function. In 2009, Horava proposed a new approach to studying membranes in the theory of quantum gravity, known as the Horava-Lifshitz gravity.The peculiarity of Horava-Lifshitz gravity is that it is renormalizable. Further, the particular case of K(Y,u)=lnY+u is investigated in detail. The parameters of describing the current accelerated expansion of the Universe are obtained and the explicit form of the connection of matter with space-time h(u) is determined. The inflationary period of the evolution of this model is also investigated. To describe the inflationary period, the form of the Hubble parameter and the slow roll-off parameter, as well as other inflationary parameters, were determined. The presented results are compared with the observation results. The analysis of the results coincides with the observation data at certain values of the integral constants in the solutions.","PeriodicalId":40756,"journal":{"name":"International Journal of Mathematics and Physics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43973760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Lax-Wendroff Difference Scheme with Richardson Extrapolation Method for One Dimensional Wave Equation Subjected To Integral Condition 积分条件下一维波动方程的Lax-Wendroff差分格式和Richardson外推法

International Journal of Mathematics and Physics Pub Date : 2021-05-31 DOI: 10.11648/J.IJTAM.20210703.11

Kedir Aliyi Koroche

{"title":"Lax-Wendroff Difference Scheme with Richardson Extrapolation Method for One Dimensional Wave Equation Subjected To Integral Condition","authors":"Kedir Aliyi Koroche","doi":"10.11648/J.IJTAM.20210703.11","DOIUrl":"https://doi.org/10.11648/J.IJTAM.20210703.11","url":null,"abstract":"In this paper, the Lax-Wend off difference scheme has been presented for solving the one-dimensional wave equation with integral boundary conditions. First, the given solution domain is discretized and the derivative involving the spatial variable is replaced by the central finite difference approximation of functional values at each grid point by using Taylor series expansion. Then, for solving the resulting second-order linear ordinary differential equation, the displacement function is discretized in the direction of a temporal variable by using Taylor series expansion, and the Lax-Wend off difference scheme is developed, then it gives a system of algebraic equations. The derivative of the initial condition is also discretized by using the central finite difference method. Then the obtained system of algebraic equations is solved by the matrix inverse method. The stability and convergent analysis of the scheme are investigated. The established convergence of the scheme is further accelerated by applying the Richardson extrapolation which yields fourth-order convergent in spatial variable and sixth-order convergent in a temporal variable. To validate the applicability of the proposed method, three model examples are considered and solved for different values of the mesh sizes in both directions. Numerical results are presented in tables in terms of maximum absolute error, L2 and L∞ norm. The numerical results presented in tables and graphs confirm that the approximate solution is in good agreement with the exact solution.","PeriodicalId":40756,"journal":{"name":"International Journal of Mathematics and Physics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42410659","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Application of fixed point theory in lt;emgt;Dlt;/emgt;-metric spaces with using banach contraction principal 不动点理论在利用banach收缩主的lt;emgt;Dlt;/emgt;-度量空间中的应用

International Journal of Mathematics and Physics Pub Date : 2021-01-01 DOI: 10.33545/26648636.2021.v3.i1a.25

Mohsin Ahmad Dar, Bhawna Agrawal

引用次数: 0

Poisson probability distribution of arrivals and departures in a queuing service system 排队服务系统到达和离开的泊松概率分布

International Journal of Mathematics and Physics Pub Date : 2021-01-01 DOI: 10.33545/26648636.2021.v3.i1a.28

A. A

引用次数: 0

Curious properties of odd and even numbered triangles 奇数和偶数三角形的奇特性质

International Journal of Mathematics and Physics Pub Date : 2021-01-01 DOI: 10.33545/26648636.2021.v3.i2a.35

R. Sivaraman

引用次数: 0

EXAFS and XANES study of cobalt complexes synthesized with ligands of chloroaniline and fluoroaniline dithiocarbamate 氯苯胺和氟苯胺二硫代氨基甲酸酯配体合成钴配合物的EXAFS和XANES研究

International Journal of Mathematics and Physics Pub Date : 2021-01-01 DOI: 10.33545/26648636.2021.v3.i1a.27

Anurag Geete, BD Shrivastava, A. Mishra

引用次数: 0

Formulation of solutions of a special standard quadratic congruence modulo an even prime integer raised to the power n 一个偶素数n次幂的特殊标准二次同余模的解的表述

International Journal of Mathematics and Physics Pub Date : 2021-01-01 DOI: 10.33545/26648636.2021.v3.i2a.31

B. M. Roy, A. Qureshi

引用次数: 0