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NEWLY-DEVELOPED AND CHEAP NANOCRYSTALLINE Fe-Cu-Nb-Mo-Si-B ALLOYS FOR SWITCHING MODE POWER SUPPLY

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Acta Metallurgica Sinica(English Letters) 1997年第6期10卷 489-494页

作者： zhang, Y.z. Shanghai Iron and Steel Research Inst Shanghai China

The synthetical soft magnetic properties were reported for newly-developed nanocrystalline Fe73.5Cu1Nb0.9 Mo2.1Si13.5B9 and Fe73.5Cu1Nb0.5 Mo2.5Si13.5B9 alloys. The levels of high-frequency losses of the new alloys are P3/100k=612 and 670 kWm-3, P2/200k=880 and 973kWm-3, P2/500k=4300 and 4600 kWm-3, P0.5/1000k=860 and 920 kWm-3, respectively. They are significantly lower than those of the superior power Mn-zn ferrite H7c4. The dependence of core loss on frequency and amplitude flux density has been analyzed. The practical applications of the new alloys to switching mode power supplies with the output power of 1 and 2kW were reported.

关键词： Boron Copper alloys Electric power systems Magnetic materials Molybdenum alloys Nanostructured materials Niobium alloys Silicon alloys

Preface to the Special Issue:Friction Stir Welding and Processing

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Acta Metallurgica Sinica(English Letters) 2020年第1期33卷 1-2页

作者： z.Y.Ma Institute of Metal Research Chinese Academy of SciencesShenyangChina

Friction stir welding(FSW),a highly effi cient solid-state joining technique,was invented at The Welding Institute,UK,in *** frictional and adiabatic heating,plastic deformation and solid-state diff usion,FSW has been widely accepted as a“green”welding technology owing to its energy effi ciency and environment ***,FSW has achieved broad application in various industries,such as aerospace and transportation,and is considered the most signifi cant development in the fi eld of material joining over the past two *** stir processing(FSP),later developed based on the fundamental principles of FSW,has been demonstrated as an eff ective and versatile metalworking technique for modifying and fabricating metallic materials.

关键词： FSP Preface to the Special Issue:Friction Stir Welding and Processing

Skew Incidence Rings and the Isomorphism Problem

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Algebra Colloquium 2022年第3期29卷 419-426页

作者： Érica z.Fornaroli Departamento de Matemática Universidade Estadual de Maringá Maringá-PRCEP:87020-900Brazil

Let X be a finite partially ordered set,R an associative unital ring andσan endomorphism of *** describe some properties of the skew incidence ring I(X,R,σ)such as invertible elements,idempotents,the Jacobson radical and the ***,if two skew incidence rings I(X,R,σ)and I(Y,S,τ)are isomorphic and the only idempotents of R and S are the trivial ones,we show that the partially ordered sets X and Y are isomorphic.

关键词： units idempotents Jacobson radical center isomorphisms

KINETICS OF TEMPER EMBRITTLEMENT IN 2.25Cr-1Mo STEEL USED FOR HOT-WALL HYDROFINING REACTORS

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Acta Metallurgica Sinica(English Letters) 2004年第2期17卷 139-146页

作者： J.z.Tan CollegeofMechanicalandPowerEngineering NanjingUniversityofTechnologyNanjing210009China

Based on the theory of grain boundary segregation, a kinetics model of temper em-brittlement caused by long-term service for hot-wall hydrofining reactors was *** kinetics model was applied to phosphorus (P) segregation in 2.25Cr-1Mo steelused for a hot-wall hydrofining reactor, and the kinetics of grain boundary segrea-tion of impurity P in the steel exposed to the process environment of the hydrofiningreactor was calculated on the basis of the model. The Auger electron spectroscopytest was performed in order to determine the grain boundary concentration of P. Theexperimental result is agreement with the theoretical calculated data. The results showthat the kinetics equation is reasonable for predicting the levels of grain boundarysegregation of impurity P in 2.25Cr-1Mo steel used for hot-wall hydrofining reactors.

关键词： hydrofining reactor 2.25Cr-1Mo steel temper embrittlement kinetics

Environmental impact of radionuclide migration in groundwater from a low intermediate level radioactive waste repository

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Journal of Environmental Sciences 2001年第2期13卷 180-184页

作者： J S Wang z F Yang S S Li z M Wang Institute of Environmental Sciences Beijing Normal University State Key Joint Laboratory of Environmental Simulation and Pollution Control Beijing 100875 China.

The radionuclide migration from a certain Chinese repository with low-intermediate level radioactive solid waste is studied. The migration in groundwater is analyzed and computed in detail. Under presumption of normal releasing, or the bottom of the repository has been marinated for one month with precipitation reaching 600 mm once and a 6 m aerated zone exists, a prediction for 7 radionuclides is conducted. It shows that the aerated zone is the primary barrier for migration. The migration for radionuclides 60Co, 137Cs, 90Sr, 63Ni, etc. will be retarded in it within 500 years. The concentration of 239Pu will be decreased by amount of 6 order. Only 3H and 14C can migrate through the aerated zone. The radionuclides that go through the aerated zone and enter the aquifer will exist in spring, stream and sea. Based on this, the intake dose by residents in different age group resulting from drinking contaminated spring water, eating seafood is calculated. The results showed that the impact of the repository to the key resident group is lower than the limit in national repository regulation standard. This complies with the repository management target.

关键词： intermediate level radioactive waste repository Environmental impact of radionuclide migration in groundwater from a low

Exotic states with QQQ′Q′configuration

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Communications in Theoretical Physics 2023年第3期75卷 56-61页

作者： z Asadi G R Boroun Department of Physics Razi UniversityKermanshah 67149Iran

In the framework of a non-relativistic quark model,we have calculated the masses of the QQQ′Q′(Q=c,b,s and Q′=c,b,s)tetraquark *** the linear and quadratic confinement potentials inside a Cornell-type potential along with all possible spin and color configurations,the Schrodinger equation masses of these tetraquark states have been *** on our numerical analysis,linear confinement and quadratic confinement produce acceptable *** that use linear confinement estimate charmonium-like tetraquark mass close to experimental data,as well as bottomonium-like tetraquark mass below the threshold of their meson-meson channels.

关键词： tetraquark quark model non-relativistic charmonium-like bottomonium-like

CHEMICALLY DEPOSITED SILVER FILM USED AS A SERS-ACTIVE OVER-COATING LAYER FOR POLYMER FILM

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Chinese Journal of Polymer Science 2001年第3期19卷 265-268页

作者： Stephen z.D. Cheng Department of Polymer Science The University of Akron Akron OH 44325 USA

When colloidal silver particles were chemically deposited onto polymer film as an over-coating layer, surface-enhanced Raman scattering (SERS) spectra could be collected for the surface analysis. SERS measurements of ... 详细信息

关键词： surface enhanced Raman scattering chemically deposited silver polymer film

Magnetic and Thermal Behaviour of One-Dimensional Antiferromagnetic Spin-1 Ising Chain at Low Temperatures

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Chinese Physics Letters 2005年第9期22卷 2382-2385页

作者： Ekrem Aydmer Cenk Akyüz Department of Physics Dokuz Eylül University TR-35160 Izmir Turkey

We investigate magnetic and thermal behaviours of one-dimensional antiferromagnetic spin-i Ising chain with single-ion anisotropy at very low temperatures using the classical transfer matrix technique. Magnetic plateaus, phase diagram, specific heat, susceptibility of the spin chain have been evaluated numerically from the free energy. The results are in good agreement with the experimental data for the spin-1 compounds [Ni2 （Medpt）2 （μ- ox）（H2O）2]（ClO4）22H2O, [Ni2（Medpt）2（μ-ox）（μ-N3）]（ClO4）0.5H2O, Ni（C2H8N2）Ni（CN）4 and Ni（C10H8N2）2 Ni（CN）4·H2O.

关键词： GROUND-STATE MAGNETIzATION SINGLE-ION-ANISOTROPY HEISENBERG CHAIN BONDALTERNATION PHASE-DIAGRAM PLATEAUS FIELD LADDERS CURVES

Flocking and clustering in mixtures of self-propelled particles with or without active reorientation

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Communications in Theoretical Physics 2023年第11期75卷 135-141页

作者： Lu Chen z C Tu Department of Physics Beijing Normal UniversityBeijing 100875China Complex Systems Division Beijing Computational Science Research CenterBeijing 100193China

We study phase behaviors of mixtures comprising active particles with and without active reorientation by varying mixing *** observe that the order parameter characterizing flocking in the steady state exhibits a linear decrease with an increase in mixing *** the order parameter characterizing clustering in the steady state presents a sharp leap as the mixing ratio ***,we obtain phase diagrams of flocking under different mixing ratios and observe that the domain corresponding to flocking experiences a contraction with the increase of mixing ***,the coordinates of the critical point on the phase boundary between the flocking and the disordered phase decay exponentially with the mixing ratio.

关键词： active matter flocking clustering binary system