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Steady-state Simulation and Experimental Investigation on Thermal Performance of Air Source Heat Pump Using Refrigerant Mixture

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Steady-state Simulation and Experimental Investigation on Th...

New color centers and luminescence of BaFI: Eu2+

2008国际低温与制冷大会

作者： Liu L H~* Chen G M~(**) Wang Q~(**) Hong F~(**) Chen B~(**) * department of Building Environment and Equipment Engineering zhejiang Science and Technology university hangzhou 310033 P.R.china ** Institute of Refrigeration and Cryogenics zhejiang university hangzhou 310027 P.R.china

＜正＞This paper reports a steady-state simulation model of air source heat pump system using refrigerant *** system is composed of a rotary compressor,a capillary tube as throttling device,a co-axial heat exchanger as condenser,and a fin-tube heat exchanger as *** accordance with the laws of mass,momentum and energy conservation,the mathematical models of four components are *** simulation algorithm is also *** the comparison of the simulated and experimental results,the same trend with the change of working conditions can be *** proposed model seems to be reliable and could be used in analyzing the thermal performance of an air source heat pump system using mixed working fluid.

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Science Bulletin 1997年第15期42卷 1268-1271页

作者： CHEN Wei and SU Mianzeng1. Laboratory of Semiconductor Materials Sciences, Institute of Semiconductor, Chinese Academy of Sciences, Beijing 100083, china 2. department of Chemistry, Peking university, Beijing 100871, china Laboratory of Semiconductor Materials Sciences Institute of Semiconductor Chinese Academy of Sciences Beijing China department of Chemistry Peking University Beijing China

MANY publications have appeared on the photostimulated luminescence (PSL) of alkalineearth mixhalides. Color centers play a very important role in the PSL and X-ray storage imag-ing processes. The F centers, V centers and oxygen-related centers in this kind ofcrystals have been investigated. All these reports provide some useful information to the PSLmechanism and thus improve the practical applications of these materials. New color centers in

关键词： BaFI:Eu2+ color centers photostimulated luminescence.

Supersymmetric WKB Approximation of Anharmonic Potential V(γ)=aγ~2+bγ-4+cγ-6

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Communications in Theoretical Physics 2006年第7期46卷 37-38页

作者： QIAN Shang-Wu,~1 MIAO Chun-Hui,~1 and GU Zhi-Yu~2 ~1Physics department, Peking university, Beijing 100871, china ~2physics department, Capital Normal university, Beijing 100037, china

This article uses the supersymmetric WKB approximation to obtain the approximate energy levels and wave functions of the anharmonic potential V(r) = ar~2+br+crin order to tesify the correctness between [Phys. Lett. A ... 详细信息

关键词： supersymmetric WKB approximation energy level wave function

Diagnosis and treatment of Bladder leiomyoma

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Diagnosis and treatment of Bladder leiomyoma

Effects of Heat Treatment Temperature and Time on Structure and Static Magnetic Property of W-type Ferrite Hollow Microspheres

2008年浙江省泌尿外科学术年会

作者： Chen Jun Luo Jin-dan department of Urology,the First Affiliated Hospital of zhejiang university,hangzhou, zhejiang Province,310003,china

Objective:Leiomyoma is a benign lesion which represents 0.04-0.5%of bladder *** is more common in females and its peak incidence is between 4th and 5th *** is the treatment of choice and adequate results have been previously ***:Two cases were reported.A 34-year-old woman with another 58-year-old women complained of frequent and urgent micturition. Cystoscopy showed a exophitic lesion at the neck of bladder in both ***:The two patients accepted partial *** period was *** pathology reported:Bladder wall ***:Leiomyoma is bladder’s most common benign non epithelial *** represents 35-46%of these lesions with a 2:5 male/female *** origins from the smooth muscle bundles and at the urinary tract the most common localizations are kidney and *** presentation depends on tumor size and *** is the most useful diagnostic tool and the pathological diagnosis is *** is the treatment of choice and technique depends on tumor size and *** is good and recurrence is rare.

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Journal of Wuhan university of Technology(Materials Science) 2007年第1期22卷 168-170页

作者：任平 Energy Source and Environmental Engineering department Shanghai University of Electric Power

Hollow spheres of hexagonal ferrite BaCozFelrO27 were fabricated through a spray pyrolysis technique using co-precipitation ferrite powder precursor as materials, followed by calcinations in an air atmosphere. The phase composition, micro-morphology, and static magnetic property of the particles were measured by XRD, SEM, and VSM. The results indicate that the method for preparation of ferrite hollow microspheres （FHM） results in a broad particles size distribution. The density of FHM decreased from 5.31 g/ cm^3 to 2.31 g/cm^3. When the heating rate was 5℃/min, and temperature was 1 200℃ for 4 hours, pure W-type ferrites were formed. With the heat treatment temperature and time increasing, the crystal structure becomes perfect, the saturation magnetization is increased and the coercive force is decreased.

关键词： microwave absorber ferrite hollow microspheres spray pyrolysis

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Observation of ultra-microtexture of fault rocks in shearing-sliding zones

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Progress in Natural Science:Materials International 2005年第5期15卷 430-434页

作者： SUN Yan1*, LU Xiancai1, SHU Liangshu1, GU Lianxing1, ZHU Wenbin1, GUO Jichun1 and LIN Aiming2(1. State Key Laboratory of Mineral Deposits Research, department of Earth Sciences, Nanjing university, Nanjing 210093, china 2. department of Geosciences, Shizuoka university, Shizuoka 836, Japan) State Key Laboratory of Mineral Deposits Research Department of Earth Sciences Nanjing University Nanjing 210093 China department of Geosciences Shizuoka University Shizuoka 836 Japan

Based on scanning electronic microscopic observation of three fault rocks in ductile-brittle shearing-sliding zones (including one palimpsest mylonite sampled from deep bore cores of Cajon Pass, California, two flowing-structured carbargillites sampled from Shaancan Well 1 located in north Shaanxi, and Well NH located in Huanghai, respectively), micron- and nanometer-scaled ultra-fine grinding grain texture of fault rocks is discovered in this study. And the geological significance of grinding grain texture is discussed in terms of its particulate organization, rheology of particulate slipping, laminar petrography and micro dynamics including dynamothermal metamorphism, fluid transferring, particulate autorotation, and so on. In addition, the remaining problems to be solved and broad prospects in this new study field are also discussed.

关键词： ductile-brittle shearing zone fault rock texture of grinding grain rheology of particulate slipping.

Stability of Periodic Solutions of Ordinary Differential Equations in Banach Spaces

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Communications in Mathematical Research 1999年第1期 39-45页

作者： Lin Zhuangpeng and Wang Xiaofeng (department of mathematics, Shenzhen university, Shenzhen, 518060)

§１．ＤｅｆｉｎｉｔｉｏｎｓａｎｄＮｏｔａｔｉｏｎｓＬｅｔＥｂｅａｒｅａｌＢａｎａｃｈｓｐａｃｅ，ａｎｄｌｅｔｘ，ｙ∈Ｅ．Ｔｈｅｄｉｒｅｃｔｉｏｎａｌｄｅｒｉｖａｔｉｖｅ［ｘ，ｙ］－ｏｆｘａｎｄｙｉｓｄｅｆｉｎｅｄｂ... 详细信息

§１．ＤｅｆｉｎｉｔｉｏｎｓａｎｄＮｏｔａｔｉｏｎｓＬｅｔＥｂｅａｒｅａｌＢａｎａｃｈｓｐａｃｅ，ａｎｄｌｅｔｘ，ｙ∈Ｅ．Ｔｈｅｄｉｒｅｃｔｉｏｎａｌｄｅｒｉｖａｔｉｖｅ［ｘ，ｙ］－ｏｆｘａｎｄｙｉｓｄｅｆｉｎｅｄｂｙ（ｆｏｒｍｏｒｅｄｅｔａｉｌｓｓ...

关键词： Directional Derivative Periodic Solution Stability

PREPARATION AND SURFACE CHARACTERIZATION OF TiO2 THIN FILMS ON GLASS BY MAGNETRON SPUTTERING METHOD

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Acta Metallurgica Sinica(English Letters) 2002年第2期15卷 207-209页

作者： L.S.Yin1,3), H. Shen2) and J.X. Zhang3) 1)College of Information Engineering, Central South university, Changsha 410075, china 2)Guangzhou Institute of Energy Conversion, CAS, Guangzhou 510070, china 3)department of Physics, Zhongshan university, Guang College of Information Engineering Central South University Changsha 410075 China

Ti thin films were firstly deposited on glass substrates by magnetron sputtering method, then sintered the Ti thin films in air atmosphere and finally TiO2 transparence thin films on glass substrates were obtained. The structure and surface morphologies of the thin films were characterized by X-ray diffraction and SEM. The growth process of the thin films has been observed. The annealing time and annealing temperatures have an affect on the growth of the films.

关键词： TiO2. thin film. magnetron sputtering

EXISTENCE AND UNIQUENESS OF ENDEMIC STATES FOR THE AGE-STRUCTURED SEIR EPIDEMIC MODEL

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Journal of Systems Science & Complexity 2006年第1期19卷 114-127页

作者： Xuezhi LI Jing CHEN department of mathematics Xinyang Teachers College Xinyang 464000 China College of Science China Agriculture University Beijing 100080 China

An age-structured SEIR epidemic model of a vertically as well as horizontally transmitted disease is investigated. Threshold results for the existence of endemic states are established for most cases. Under certain conditions, uniqueness is also shown. Threshold used are explicitly computable in term of demographic and epiderniological parameters of the model.

关键词： Age structure positive endemic state SEIR epidemic model threshold value vertical transmission.

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