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Temperature and Thermal Stress Distribution for Metal Mold in Squeeze Casting Process

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Journal of Materials Science & Technology 2008年第3期24卷 347-350页

作者： C.h.Lee S.h.Lee Institute of Technology and Science Chung-Ang University

In the squeeze casting process, loaded high pressure （over approximately 200 MPa） and high temperature influence the thermo-mechanical behavior and performance of the used metal mold. Therefore, to safely maintain the metal molds, the thermo-mechanical characteristics （temperature and thermal stress） of metal mold in the squeeze casting must be investigated. In this paper, temperature and thermal stress distribution of steel mold in squeeze casting process were investigated by using a three-dimensional non-steady heat conduction analysis and a three-dimensional thermal elastic-plastic analysis considering temperature-dependent thermophysical and mechanical properties of the steel mold.

关键词： Squeeze casting Steel mold Thermal stress Thermo-Mechanical analysis

Adaptive Functional Projective Lag Synchronization of a hyperchaotic Rossler System

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Chinese Physics Letters 2009年第9期26卷 69-72页

作者： Tae h. Lee Ju h. Park Nonlinear Dynamics Group Department of Electrical Engineering Yeungnam University 214-1 Dae-Dong Kyongsan 712-749 Republic of Korea

We explain the functional projective lag synchronization of a hyperchaotic Rossler system with four unknown parameters, where the output of the master system lags behind the output of the slave system proportionally. Based on Lyapunov stability theory, an active control method and adaptive control law are employed to make the states of two hyperchaotic Rossler systems asymptotically synchronized. Finally, some numerical examples are provided to show the effectiveness of our results.

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Design of small-area multi-bit antifuse-type 1 kbit OTP memory

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Journal of Central South University 2009年第3期16卷 467-473页

作者：李龙镇 LEE J h KIM T h JIN K h PARK M h hA P B KIM Y h Department of Electronic Engineering Changwon National University Department of Computer Science and Technology Yanbian University

A multi-bit antifuse-type one-time programmable （OTP） memory is designed, which has a smaller area and a shorter programming time compared with the conventional single-bit antifuse-type OTP memory. While the conventional antifuse-type OTP memory can store a bit per cell, a proposed OTP memory can store two consecutive bits per cell through a data compression technique. The 1 kbit OTP memory designed with Magnachip 0.18 μm CMOS （complementary metal-oxide semiconductor） process is 34% smaller than the conventional single-bit antifuse-type OTP memory since the sizes of cell array and row decoder are reduced. And the programming time of the proposed OTP memory is nearly 50% smaller than that of the conventional counterpart since two consecutive bytes can be compressed and programmed into eight OTP cells at once. The layout area is 214 μm× 327 μ,, and the read current is simulated to be 30.4 μA.

关键词： multi-bit OTP programming time antifuse memory data compression

Plasma density measurement and downstream etching of silicon and silicon oxide in Ar/NF3 mixture remote plasma source

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Plasma Science and Technology 2019年第6期21卷 52-57页

作者： h J YEOM D h ChOI Y S LEE J h KIM D J SEONG S J YOU h C LEE Korea Research Institute of Standards and Science(KRISS) Daejeon 34113 Republic of Korea Department of Physics Chungnam National University Daejeon 34134 Republic of Korea

In this study,plasma density measurements were performed near the plume region of the remote plasma source (RPS) in Ar/NF3 gas mixtures using a microwave cutoff *** measured plasma density is in the range of 1010-1011 cm-3 in the discharge conditions with RPS powers of 2-4 kW and gas pressures of 0.87-4 *** plasma density decreased with increasing gas pressures and RPS powers under various Ar/NF3 mixing *** decrease in the plasma density measured at the fixed measurement position (plume region) can be understood by the reduction of the electron energy relaxation length with increases in the gas pressures and mixing ratio of NF3/(Ar/NF3).We also performed downstream etching of silicon and silicon oxide films in this *** etch rate of the silicon films significantly increases while the silicon oxide is slightly etched with the gas pressures and *** was also found that the etch rate strongly depends on the wafer position on the processing chamber electrode,and that the etch selectivity reached 96-131 in the discharge conditions of RF powers (3730-4180 W) and gas pressures (3.6-4 Torr).

关键词： remote plasma source electron density cutoff probe downstream etch

New method for calibration of sun photometers

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Chinese Optics Letters 2009年第9期7卷 760-763页

作者： h.h.Asadov I.G.Chobanzadeh Azerbaijan National Aerospace Agency

A new method for calibration of sun photometers based on Bouguer-Beer law is proposed. The developed basic equation of calibration makes it possible to formulate the derivative methods of calibration on the basis of p... 详细信息

关键词： New method for calibration of sun photometers 双入

Probe chiral magnetic effect with signed balance function

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Chinese Physics C 2020年第5期44卷 43-55页

作者： A.h.Tang Brookhaven National Laboratory UptonNew York 11973USA

In this paper a pair of observables are proposed as alternative ways,by examining the fluctuation of net momentum-ordering of charged pairs,to study the charge separation induced by the Chiral Magnetic Effect(CME)in relativistic heavy ion *** are,the out-of-plane to in-plane ratio of fluctuation of the difference between signed balance functions measured in pair’s rest frame,and the ratio of it to similar measurement made in the laboratory *** observables have been studied with simulations including flow-related backgrounds,and for the first time,backgrounds that are related to resonance's global spin *** two observables have similar positive responses to signal,and opposite,limited responses to identifiable backgrounds arising from resonance flow and spin *** observables have also been tested with two realistic models,namely,a multi-phase transport(AMPT)model and the anomalous-viscous fluid dynamics(AVFD)*** two observables,when cross examined,will provide useful insights in the study of CME-induced charge separation.

关键词： chiral magnetic effect balance function signed balance function heavy ion collisions momentum ordering

On the Nature of Long Period Radio Pulsar GPM J1839-10:Death Line and Pulse Width

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Research in Astronomy and Astrophysics 2023年第12期23卷 215-220页

作者： h.Tong School of Physics and Materials Science Guangzhou UniversityGuangzhou 510006China

Recently another long period radio pulsar GPM J1839-10 has been reported,similar to GLEAM-X ***,the energy budget and rotational evolution of long period radio pulsars had been *** time,the death line and pulse width for neutron star and white dwarf pulsars are *** pulse width is included as the second criterion for neutron star and white dwarf *** is found that:(1)PSR J0250+5854 and PSR J0901-4046 *** be normal radio *** have narrow pulse width and they lie near the radio emission death line.(2)The two long period radio pulsars GLEAM-X J162759.5-523504.3 and GPM J1839-10 are unlikely to be normal radio *** possible pulse width is relatively *** lie far below the fiducial death line on the P-P^(·)diagram.(3)GLEAM-X J162759.5-523504.3 and GPM J1839-10 may be magnetars or white dwarf radio *** present,there are many parameters and uncertainties in both of these possibilities.

关键词： stars magnetars-(stars:)pulsars general-(stars:)pulsars individual(GPM J1839−10)

Darboux transformation and exact multisolitons for a matrix coupled dispersionless system

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Communications in Theoretical Physics 2020年第7期72卷 1-7页

作者： h Wajahat A Riaz Department of Mathematics China University of Mining and TechnologyBeijing100083China

We present a matrix coupled dispersionless(CD)system.A Lax pair for the matrix CD system is proposed and Darboux transformation is constructed on the solutions of the matrix CD system and the associated Lax *** express an N soliton formula for the solutions of the matrix CD system in terms of *** using properties of the quasideterminants,we obtain some exact solutions,including bright and dark-type solitons,rogue wave and breather solutions of the matrix CD ***,it has been shown that the solutions of the matrix CD system are expressed in terms of solutions to the usual CD system,sine-Gordon equation and Maxwell-Bloch system.

关键词： Matrix coupled dispersionless system Darboux transformation solitons

holographic dark energy in non-conserved gravity theory

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Communications in Theoretical Physics 2024年第4期76卷 126-133页

作者： h R Fazlollahi Institute of Gravitation and Cosmology Peoples Friendship University of Russia(RUDN University)6 Miklukho-Maklaya StMoscow117198Russia

Recently, reconsidering the Rastall idea T_(μ;νν)^(v)=α_(,μ) through relativistic thermodynamics gives a new form for the scalar field α which led us to construct modern modified theory of gravity debugged ‘non-conserved gravity theory’ Fazlollahi 2023 Euro. Phys. J. C 83 923. This theory unlike other modified theories of gravity cannot directly explain the current acceleration expansion in the absence of the cosmological constant and or existence of other forms of dark energy. hence, in this study we have reinvestigated holographic dark energy Ρ_(X)~h^(2) in the non-conserved theory of gravity. In this context, the density and pressure of dark energy depend on the non-conserved term and density of the dust matter field. As shown, due to non-conservation effects on large-scale structures, unlike the original holographic model, our model onsets an acceleration epoch for the current Universe satisfies observations. Moreover, the interaction and viscous scenarios are studied for this model.

关键词： non-conserved gravity covariant form of thermodynamics holographic dark energy