Open Access Journal of Physics最新文献

{"title":"Response of Ocean Eddies to Monsoon Winds Over the Western Arabian Sea","authors":"B. G. Prasad, K. M. Krishna","doi":"10.22259/2637-5826.0402002","DOIUrl":"https://doi.org/10.22259/2637-5826.0402002","url":null,"abstract":"","PeriodicalId":333499,"journal":{"name":"Open Access Journal of Physics","volume":"473 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115309681","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}

{"title":"Similarity between Dirac and Maxwell Equations","authors":"Doron Kwiat","doi":"10.22259/2637-5826.0303003","DOIUrl":"https://doi.org/10.22259/2637-5826.0303003","url":null,"abstract":"The internal structure of the electron have been the subject of many articles, from Max Born2 who wrote in 1933: \"The attempts to combine Maxwell's equations with the quantum theory (Pauli, Heisenberg, Dirac) have not succeeded. One can see that the failure does not lie on the side of the quantum theory, but on the side of the field equations, which do not account for the existence of a radius of the electron (or its finite energy=mass) \".","PeriodicalId":333499,"journal":{"name":"Open Access Journal of Physics","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123008455","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}

{"title":"Numerical investigation of Cooling Performance in Classic and New Cooling Channels of Mold Core","authors":"O. İpek, M. Kan","doi":"10.22259/2637-5826.0203002","DOIUrl":"https://doi.org/10.22259/2637-5826.0203002","url":null,"abstract":"During gravity die casting, the mold cooling process obtained via proper die design and a controlled thermal management system are critical factors for optimizing production throughput and casting quality. Metal-casting is one of the most prominent sectors that strengthen the economy and show its development level. The added value produced by the industry is much higher than its production costs. Today, classical manufacturing methods are used for molding. However, current LST-based applications are used for cutting and removing material from a block in the manufacturing of parts as well as the forming process, wherein these applications help melt metal powder layer by layer. In contrast, a combination of multiple methods can be used in conventional manufacturing. This technology is employed in a wide range of industries for the production of various parts and components and for manufacturing processes including implant manufacturing, medical equipment, spacecraft parts, satellite systems, aircraft components, mini jet turbines, compressors and engine components, gas turbine equipment and complex geometry products in addition to the products that require precisely designed parts and devices. LST technology applied to classical manufacturing methods allows a rapid and easy production of even very challenging products, and the production processes that typically take a long time. Moreover, this technology will yield even better results in the future as it is developed further. Experimental studies have demonstrated how the microstructure of the manufactured parts is affected by the molding process. The new methods developed in previous studies have optimum conditions for the production of materials that are suitable for the selective laser sintering (SLS) method. The selective laser melting (SLM) method applied with conventional manufacturing injection on steel samples caused the samples to have higher tensile strength. Past studies have made an experimental investigation of the particle mechanical structure and mechanical properties of the parts produced by LST [1-7]. There are studies that made an effort to improve surface quality. Furthermore, researchers have carried out experiments on metal-casting to increase the wear resistance of mold surfaces during casting ABSTRACT","PeriodicalId":333499,"journal":{"name":"Open Access Journal of Physics","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133554696","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}

{"title":"New Method for Solving the Problem of the Occurrence of Solitons in an Open Water Channel","authors":"A.N. Volobuev","doi":"10.22259/2637-5826.0403001","DOIUrl":"https://doi.org/10.22259/2637-5826.0403001","url":null,"abstract":"","PeriodicalId":333499,"journal":{"name":"Open Access Journal of Physics","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128475072","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}

{"title":"Saha Equation for Partially Ionized Relativistic Hydrogen Plasma in Rindler Space","authors":"Sanchita Das, S. Chakrabarty","doi":"10.22259/2637-5826.0203004","DOIUrl":"https://doi.org/10.22259/2637-5826.0203004","url":null,"abstract":"It is well-known that the conventional Lorentz transformations are the spacetime coordinate transformations between two inertial frames of references [1]. However, following the principle of equivalence, it is trivial to obtain the space-time transformations between a uniformly accelerated frame and an inertial frame and vice-versa in the same manner as it is done in special theory of relativity [2, 3, 4, 5, 6]. In the present scenario the flat spacetime geometry is called the Rindler space. For the sake of illustration of principle of equivalence, one may state, that a reference frame undergoing an accelerated motion in absence of gravitational field is equivalent to a frame at rest in presence of a gravitational field. Therefore, in the present picture, the magnitude of the uniform acceleration is exactly equal to the strength of gravitational field. We may assume that the gravitational field is produced by a strong gravitating object. We further approximate that the gravitational field is constant within a small domain of special region. Since it is exactly equal to the uniform acceleration of the moving frame, this is also called the local acceleration of the frame.","PeriodicalId":333499,"journal":{"name":"Open Access Journal of Physics","volume":"226 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115585661","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}

{"title":"On the Non-Feasibility of Special relativity","authors":"Donald Aucamp","doi":"10.22259/2637-5826.0204003","DOIUrl":"https://doi.org/10.22259/2637-5826.0204003","url":null,"abstract":"This paper is divided into three main parts which deal with the feasibility of the Special Theory of Relativity (STR).In Part 1two proofs that vary in complexity are given which show that Einstein’s necessary conditions are not sufficient conditions. The first of these proofs uses the same thought experiment employed in his paper, where it is shown that he didn’t look at his own one-way results. Thus, his round-trip transformations are correct and necessary, but not sufficient. The second proof shows the often-used railroad car thought experiment in many textbooks also fails. In Part 2 Einstein’s equation for mass, which is derived from and dependent on STR, is shown to be an untenable theory. Then in Part 3STR is proved be incorrect as based on this author’s paper on electromagnetic theory. Finally, in Part 4 the experimental verification of STR is challenged. A replacement theory for STR, including relativistic mass, is covered in the third paper in this series.","PeriodicalId":333499,"journal":{"name":"Open Access Journal of Physics","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114508384","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}

{"title":"A Solution to the Dark Energy Problem","authors":"Donald Aucamp Sc.D","doi":"10.22259/2637-5826.0401001","DOIUrl":"https://doi.org/10.22259/2637-5826.0401001","url":null,"abstract":"REVIEW OF LAW L1 AND COROLLARY C1 Review of Law L1 and Corollary C1 In Aucamp [5] a gravitational law L1 is proposed which tweaks Newton’s Law of Gravity (NLG) in an insignificant way. The theory examines the force exerted by a gravity “ray” sent at t by a moving body of mass M and subsequently received by a moving body of mass m. In the analysis IFR(t) is defined as the inertial frame of reference of M at the ray emission time t. The term, “ray”, is used here to indicate the gravitational field emitted over an infinitesimal period of time. The following assumptions are made:","PeriodicalId":333499,"journal":{"name":"Open Access Journal of Physics","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126840937","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}

{"title":"Theory of Time Activity in Black Hole","authors":"S. Ahamed","doi":"10.22259/2637-5826.0204005","DOIUrl":"https://doi.org/10.22259/2637-5826.0204005","url":null,"abstract":"","PeriodicalId":333499,"journal":{"name":"Open Access Journal of Physics","volume":"109 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132444175","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}

{"title":"NASA EM Drive via E-Infinity Cantorian-Fractal Space-Time Theory","authors":"L. Marek-Crnjac","doi":"10.22259/2637-5826.0202001","DOIUrl":"https://doi.org/10.22259/2637-5826.0202001","url":null,"abstract":"In the present short Letter we follow El Naschie in advancing the thesis that EM drive is in principle not only possible but more than that. To show that nothing is simpler than appealing to the Hartle-Hawking universe wave function theory as used in a few recent publications by El Naschie concerned with ordinary cosmic energy density and dark cosmic energy density [4-29]. The first, in the meantime well known, is the energy density of the quantum particle which amounts to 4.5% of the total while the rest of 95.5% is related to the quantum wave side of the universe [10,11]. This gradient is sufficient to support a fuelless EM drive enabling interstellar navigation from anywhere to infinity. In fact we need an engine for navigation only, the thrust comes naturally from the local form of one sided Casimir effect of space-time as discussed sometime ago by El Naschie [11-13]. There is a simple picture associated with the energy density gradient from 4.5% to 95.5% which we will attempt to explain in what follows in general terms while detailed mathematical equations are given in the Appendix [4,11,13]. This picture is based on the quantum E-infinity fact that the quantum wave surrounds and guides the quantum particle [7-29]. Applying all that to the entire universe we see that a point inside the universe could be thought of as 4.5% quantum particle energy density location while any point at the hyperbolic horizon and the holographic boundary of the universe may be regarded as the 95.5% quantum wave energy density [4,7,11]. The same idea is expressed in a different language when one invokes Dvoretzky‟s theorem as done by El Naschie and reason that 95.5% of the volume of the higher dimensional (i.e. a five dimensional KaluzaKlein space-time) universe of our real existence lies at a thin layer of the surface [12,13]. Consequently one expects that any spacecraft will be pulled from any point of the interior of the universe towards the hyperbolic boundary of the universe so that a skilful navigation technique could get it from anywhere to any destination and practically without fuel except for navigation. This conclusion is reinforced completely by Dvoretzky‟s theorem [12,13]. That is essentially all that we need for the theoretical justification of EM drive. We stress once more that El Naschie‟s theory goes as far as saying that the thrust is inbuilt into the geometry and topology of the five dimensional vacuum of a fractal space-time so that the motion of the spacecraft is in principle possible with or without an engine. In his formal and ABSTRACT","PeriodicalId":333499,"journal":{"name":"Open Access Journal of Physics","volume":"33 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132325999","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}

{"title":"Theory of Time Dilation / Twin Paradox and its Limitation","authors":"S. Ahamed","doi":"10.22259/2637-5826.0204002","DOIUrl":"https://doi.org/10.22259/2637-5826.0204002","url":null,"abstract":"Washington DC, capital of USA, and Delhi, capital of India are situated at a time difference of 12/13 hours. If we travel this distance by a rocket with a speed of 10 mile/second it will take only 9/10 minutes. When we start at this speed from Washington DC to Delhi at 8 PM we will reach Delhi by 8:10 PM, Washington standard time. When we return back to Washington DC it will be 8:20 PM, Washington standard time. Only 20 minutes is gone by the coming and going process. Though it will be morning in Delhi. But this will happen in case of every short and long distance. No matter you travel at speed of, rocket, Light or more than the speed of light. If you travel at the speed of light for 2 years and when you will come back again to the earth; it will be passed-a total of 4 years; 2 years for going and 2 years for coming. Both the traveler and non-traveler will pass the same time. If the travelers are twin, they both will be older by 4 years more. There is no such thing as twin paradox will happen. Their look may be a bit different due to gravitational force on the earth.","PeriodicalId":333499,"journal":{"name":"Open Access Journal of Physics","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124786548","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}