Turkish Journal of Physics最新文献_第6页

An improvement of current driving and electrical conductivity properties in covetics 电流驱动和导电性能的改进

IF 2.1

Turkish Journal of Physics Pub Date : 2021-01-01 DOI: 10.3906/fiz-2108-8

Mesut Atasoyu, Emin Argun, M. Ertuğrul

{"title":"An improvement of current driving and electrical conductivity properties in covetics","authors":"Mesut Atasoyu, Emin Argun, M. Ertuğrul","doi":"10.3906/fiz-2108-8","DOIUrl":"https://doi.org/10.3906/fiz-2108-8","url":null,"abstract":": Compared to pure Cu, Cu lattice retaining carbon atoms, called a covetic material, can have better electrical conductivity. Furthermore, the incorporation of carbon nanostructures into Cu-alloys could improve the mechanical properties of Cu-alloys. In the simulation study, we investigated Joule heating due to applied DC current on molten Cu metal concerning how to improve current density of covetic materials. In addition, we will discuss interfacial effects on covetic-metal electrodes to meet better current driving performance. The covetic composite excited at one electrode (width = 10 nm) has a higher current drive capability as a value of 3.54 10 7 A/m 2 , for 1000 A current at a temperature of 1073.2 K, this value is a constant while temperature is changing up to 1573.2 K. We measured the conductivity of the proposed covetic materials at various carbon nanotube densities at room temperature. Experimental results show the lowest resistivity value accomplished after mixing and temperature annealing as a value of 1.7810 − 8 Ω .m , where the covetic sample has 1.27% carbon nanotube density, and that the electrical conductivity is superior to that of Cu-carbon nanotube composites previously reported.","PeriodicalId":46003,"journal":{"name":"Turkish Journal of Physics","volume":"101 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70203488","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

Modern Quantum Mechanics, Why We Need it, How to Use it? 现代量子力学，我们为什么需要它，如何使用它?

IF 2.1

Turkish Journal of Physics Pub Date : 2021-01-01 DOI: 10.3906/fiz-2110-11

V. Karimipour

引用次数: 0

Contrasting the fuzzball and wormhole paradigms for black holes 黑洞的模糊球和虫洞范式的对比

IF 2.1

Turkish Journal of Physics Pub Date : 2021-01-01 DOI: 10.3906/fiz-2111-13

Bin Guo, Marcel R. R. Hughes, S. Mathur, Madhur Mehta

{"title":"Contrasting the fuzzball and wormhole paradigms for black holes","authors":"Bin Guo, Marcel R. R. Hughes, S. Mathur, Madhur Mehta","doi":"10.3906/fiz-2111-13","DOIUrl":"https://doi.org/10.3906/fiz-2111-13","url":null,"abstract":"We examine an interesting set of recent proposals describing a `wormhole paradigm' for black holes. These proposals require that in some effective variables, semiclassical low-energy dynamics emerges at the horizon. We prove the `effective small corrections theorem' to show that such an effective horizon behavior is not compatible with the requirement that the black hole radiate like a piece of coal as seen from outside. This theorem thus concretizes the fact that the proposals within the wormhole paradigm require some nonlocality linking the hole and its distant radiation. We try to illustrate various proposals for nonlocality by making simple bit models to encode the nonlocal effects. In each case, we find either nonunitarity of evolution in the black hole interior or a nonlocal Hamiltonian interaction between the hole and infinity; such an interaction is not present for burning coal. We examine recent arguments about the Page curve and observe that the quantity that is argued to follow the Page curve of a normal body is not the entanglement entropy but a different quantity. It has been suggested that this replacement of the quantity to be computed arises from the possibility of topology change in gravity which can generate replica wormholes. We examine the role of topology change in quantum gravity but do not find any source of connections between different replica copies in the path integral for the R'{e}nyi entropy. We also contrast the wormhole paradigm with the fuzzball paradigm, where the fuzzball does radiate like a piece of coal. Just as in the case of a piece of coal, the fuzzball does not have low-energy semiclassical dynamics at its surface at energies $Esim T$ (effective dynamics at energies $Egg T$ is possible under the conjecture of fuzzball complementarity, but these $Egg T$ modes have no relevance to the Page curve or the information paradox).","PeriodicalId":46003,"journal":{"name":"Turkish Journal of Physics","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48428605","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: 19

Thermal sensitivity from current-voltage-measurement temperature characteristics in Au/n-GaAs Schottky contacts Au/n-GaAs肖特基触点电流-电压测量温度特性的热敏性

IF 2.1

Turkish Journal of Physics Pub Date : 2021-01-01 DOI: 10.3906/fiz-2108-15

引用次数: 13

A Simulation and experimental validation of third-order coma in Nodal Aberration Theory (NAT) with a Cassegrain telescope 用卡塞格伦望远镜模拟和实验验证了节点像差理论(NAT)中的三阶彗发

IF 2.1

Turkish Journal of Physics Pub Date : 2021-01-01 DOI: 10.3906/fiz-2108-4

引用次数: 0

A simulation and experimental validation of third-order coma in nodal aberrationtheory with a Cassegrain telescope 卡塞格林望远镜对节点畸变理论中三阶彗差的模拟和实验验证

IF 2.1

Turkish Journal of Physics Pub Date : 2021-01-01 DOI: 10.55730/1300-0101.1002

Ö. Karci

{"title":"A simulation and experimental validation of third-order coma in nodal aberrationtheory with a Cassegrain telescope","authors":"Ö. Karci","doi":"10.55730/1300-0101.1002","DOIUrl":"https://doi.org/10.55730/1300-0101.1002","url":null,"abstract":": This study presents a simulation and experimental validation of third-order coma in Nodal Aber-ration Theory (NAT) with a custom-designed Cassegrain system. The Cassegrain system uses a piezo-driven flexure tool to align the telescope’s secondary mirror with respect to the primary mirror. This alignment mechanism is also used to misalign the telescope’s secondary mirror to induce the intentional aberrations. The third-order Fringe Zernike coma (Z 7 / 8 ) was simulated utilizing the Cassegrain telescope’s real ray-trace model (e.g., in Code V) and analyzed for both the telescope’s nominal aligned and misaligned states. The simulated aberration of third-order coma was induced utilizing the secondary mirror misalignments and measured inter-ferometrically on a 5 × 5 mesh of field points on the telescope’s focal plane. The experimental results were compared with simulation results, and we showed that the results are consistent with each other. Hence, we validated the shift of aberration field center (zero coma, or coma node) from the optical axis, where the third-order coma is linear with the field as predicted by NAT for the Cassegrain telescope. For demonstrating the stability and accuracy of the experimental results, a statistical analysis was conducted.","PeriodicalId":46003,"journal":{"name":"Turkish Journal of Physics","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42741565","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

An improvement of current driving and electrical conductivity properties incovetics 电流驱动和电导率性能的改进

IF 2.1

Turkish Journal of Physics Pub Date : 2021-01-01 DOI: 10.55730/1300-0101.1001

Mesut Atasoyu, E. A. Oral, M. Ertuğrul

引用次数: 0

Vacuum polarization energy of the kinks in the sinh-deformed models 辛变形模型中扭结的真空极化能

IF 2.1

Turkish Journal of Physics Pub Date : 2020-12-22 DOI: 10.3906/fiz-2103-32

I. Takyi, B. Barnes, J. Ackora-Prah

引用次数: 5

Dispersion management for optical parametric amplifiers in midinfrared midinfrared中光参量放大器的色散管理

IF 2.1

Turkish Journal of Physics Pub Date : 2020-12-18 DOI: 10.3906/fiz-2006-13

H. Cankaya

{"title":"Dispersion management for optical parametric amplifiers in midinfrared","authors":"H. Cankaya","doi":"10.3906/fiz-2006-13","DOIUrl":"https://doi.org/10.3906/fiz-2006-13","url":null,"abstract":"Midinfrared (MIR) is an attractive spectral region for many applications ranging from vibrational spectroscopy to attosecond physics. However, in this spectral region, the dispersion management techniques are not as mature as the ones in the near-infrared (NIR) or visible, which is a key ingredient of ultrafast laser technology. In this manuscript, the transfer of dispersion management schemes for optical parametric (chirped pulse) amplifiers (OP(CP)As) from NIR to MIR is discussed. Among those, a scheme based on Martinez-type grating stretcher and a bulk compressor is proposed and numerically analyzed. As a case study, the proposed scheme is applied numerically to a 2-μm pumped two-stage optical parametric amplifier (OPA) system at 4.06 μm. In the model OPA system, the seed pulses are generated by white-continuum in bulk crystal and then amplified via zinc germanium phosphide (ZGP)-based OPAs. Parametric gain bandwidth of the ZGP nonlinear crystal is numerically studied. According to the numerical simulations, 3-mm crystal supports pulses with 26.5 fs pulse duration (FWHM) at 4.06 μm. With the proposed dispersion management scheme, the seed pulses are first stretched inside a Martinez grating stretcher to 1.4–1.6 ps for efficient amplification in OPA stages and then compressed down to the transform-limit inside CaF2 bulk material.","PeriodicalId":46003,"journal":{"name":"Turkish Journal of Physics","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2020-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49047000","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

Tuning the magnetic field sensitivity of planar Hall effect sensors by using a Cr spacer layer in a NiFe/Cr/IrMn trilayer structure 利用NiFe/Cr/IrMn三层结构中的Cr间隔层调节平面霍尔效应传感器的磁场灵敏度

IF 2.1

Turkish Journal of Physics Pub Date : 2020-12-18 DOI: 10.3906/fiz-2008-19

H. Pişkin, N. Akdoğan

引用次数: 3