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ON THE MATRIX THEORY OF CONTINUOUS BEAMS ON ELASTIC FOUNDATION

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Science in China,Ser.A 1953年第3期 171-178页

作者： hu hai-chang Institute of Mathematics Academia Sinica

Continuous beams are commonly treated by methods of simultaneous equations, such as three-moment equations, or by methods of successive approximation, such as moment distribution method. Recently Prof. Chien Wei-zang,... 详细信息

关键词： ON THE MATRIX THEORY OF CONTINUOUS BEAMS ON ELASTIC FOUNDATION line

TORSION OF PRISMS BOUNDED BY TWO INTERSECTING CIRCULAR CYLINDERS

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Science in China,Ser.A 1953年第4期 269-281页

作者： hu hai-chang Institute of Mathematics Academia Sinica

*** Since many useful cross sections may be approximately described as bounded by two intersecting circular arcs, the problem of torsion of prisms of such cross sections have long been noticed by many authors. In the ... 详细信息

关键词： sections torsion noticed circular shearing analogy coordinates sometimes contour cylinders

On an Eigenvalue Problem Related to the Buckling of Sandwich Beams

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Applied Mathematics and Mechanics(English Edition) 1980年第1期1卷 55-62页

作者： hu, hai-chang( Institute of Spacecraft System Engineering, Chinese Academy of Space Technology, Peking, China ) Institute of Spacecraft System Engineering Chinese Academy of Space Technology Peking China

This paper gives various properties of eigenvalue problems related to the buckling of *** applications of eigenfunctions are also indicated.

关键词： On an Eigenvalue Problem Related to the Buckling of Sandwich Beams

ON THE SNAPPING OF A THIN SPHERICAL CAP

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物理学报 1954年第2期28卷 131-136页

作者： hu hai-chang(Institute of Mathematics, Academia Sinica)

In this paper,the snapping of a thin spherical cap under edge moment is *** snapping of the same cap under line load distributed along a circle as shown in Fig.1has been disscussed by Chien Wei-zang in two unpublished... 详细信息

关键词： unpublished spherical summarized satisfy circle uniformly unstable radius deflection approximate

ON THE THREE-DIMENSIONAL PROBLEMS OF THE THEORY OF ELASTICITY OF A TRANSVERSELY ISOTROPIC BODY*

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Science China Mathematics 1953年第2期 145-151页

作者： hu hai-chang (Institute of Mathematics, Acadcmia Sinica)

In the year of 1940, S. G. Lehnitzky obtained a rather general solution of the axialsymmetric deformation of a transversely isotropic body of revolution. His results will be generalized in this paper to the solution o... 详细信息

关键词：十斋 body 石丁

TORSION OF PRISMS BOUNDED BY TWO INTERSECTING CIRCULAR CYLINDERS

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物理学报 1953年第4期 250-254页

作者： hu hai-chang(Institute of Mathematics, Academia Sinica)

In this paper,the Problem of torsion of prisms bounded by two intersecting circularcylinders is solved by means of Fourier’s *** is found that when the angleof interection of these two circular cylinders is commensurable with πthe stress functionand the torsional rigidity of the prism can be expressed in closed form in terms ofcircular and hyperbolic sines and cosine.

关键词： TORSION OF PRISMS BOUNDED BY TWO INTERSECTING CIRCULAR CYLINDERS 胡海昌

Ferromagnetism and insulating behavior with a logarithmic temperature dependence of resistivity in Pb_(10-x)Cux(PO_(4))_(6)O

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Science China(Physics,Mechanics & Astronomy) 2024年第1期67卷 106-111页

作者： Yuhang Zhang Cong Liu Xiyu Zhu hai-hu Wen Center for Superconducting Physics and Materials National Laboratory of Solid State Microstructures and Department of PhysicsNational Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China

Recent claim of discovering above-room-temperature superconductivity(Tc≈400 K)at ambient pressure in copper doped apatite Pb10(PO_(4))_(6)O has stimulated world-wide enthusiasm and impulse of motion.A lot of follow-up works have been carried out with controversial *** check whether superconductivity is really present or absent in the material,we need samples which should have a rather pure phase of Pb_(10-x)Cux(PO_(4))_(6)*** we report the characterization results from the Pb_(10-x)Cux(PO_(4))_(6)O with a fraction of about 97 wt.%inferred from the fitting to the X-ray diffraction pattern,if assuming Cu2S as the only *** resistivity measurements show that it is a semiconductor characterized roughly by a ln(1/T)temperature dependence in wide temperature region without trace of *** measurements show that it has a general ferromagnetic signal with a weak superparamagnetic *** grains of the sample show clear interactions with a Nb Fe B *** detected Cu concentration is much lower than the expected nominal *** results show the absence of metallicity and superconductivity in Pb_(10-x)Cux(PO_(4))_(6)O at ambient pressure,and suggest the presence of strong correlation effect.

关键词： superconductivity Pb10(PO4)6O ferromagnetic correlation effect

ON THE GENERAL THEORY OF ELASTICITY FOR A SPHERICALLY ISOTROPIC MEDIUM

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Science in China,Ser.A 1954年第3期 247-260页

作者： huhai-chang Institute of Mathematics Academia Sinica

Ⅰ. INTRODUCTION In the year 1865, Saint-Venant introduced the concept of sphericalisotropy, i.e., that there are materials of which the elastic properties are thesame for all directions tangent to a series of concentric spheres, and solvedin the same paper the problem of a spherical shell made of such materialunder uniformly distributed internal and external pressures. But owing tothe extreme complexity of the fundamental equations of the theory ofelasticity for a spherically isotropic medium, there have been very few authors

关键词： ON THE GENERAL THEORY OF ELASTICITY FOR A SPHERICALLY ISOTROPIC MEDIUM

Tunable luminescence of Bi^(3+)/Eu^(3+)-doped SiO_(2)-Al_(2)O_(3)-MCO_(3)(M=Ca,Sr,Ba) glasses for WLED

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Journal of Rare Earths 2024年第9期42卷 1652-1657,I0001页

作者： Falin Zhang Xiaoying Liang Rongfei Wei hai Guo Fangfang hu Department of Physics Zhejiang Normal UniversityJinhua321004China

In this work,a group of Bi^(3+)/Eu^(3+)-doped SiO2-Al_(2)O_(3)-MCO_(3)(M=Ca,Sr,Ba) glasses were fabricated through melt-quenching *** structure and photoluminescence characters were studied via Xray diffraction(XRD),UV-Vis transmission spectra(TRS),excitation spectra,emission spectra and decay *** XRD results show that no nano-crystal phase forms in glass matrix with different doping concentrations of Bi^(3+)and Eu^(3+)*** regulating optical alkalinity value,the intensity of Bi^(3+)ions increases and the peak position shifts to red *** Bi^(3+)/Eu^(3+) co-doped glasses show a blue-white-yellow-red luminescence by changing concentration of Eu^(3+) *** transfer efficiency from Bi^(3+) to Eu^(3+) can reach as high as 10.54%.At 423 K, the emission intensity of 55SiO_(2)-10Al_(2)O_(3)-35BaO-0.25Bi_(2)O_(3)(GBE0.5) is 31.1% of that at 308 ***,the activation energy of the glass matrix is 0.251 *** results suggest that these Bi^(3+)/Eu^(3+) co-doped glass samples possess potential application in LED field.

关键词： Bi^(3+) Eu^(3+) Glass White light-emitting diode Energy transfer Rare earths