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AN ANALYTICAL SOLUTION FOR THE MODEL OF DRUG DISTRIBUTION AND ABSORPTION IN SMALL INTESTINE

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Acta Mechanica Sinica 1990年第4期6卷 316-323页

作者： Xu Mingyu (department of Mathematics,Shandong university,{2.,2.0100,China) 1. department of Mathematics Shandong University 250100 Jinan China

According to the physiological and anatomical characteristics of small intestine,neglecting the effect of its motility on the distribution and absorption of drug and nutrient,*** et *** a model of two-dimensional laminar flow in a circular porous tube with permeable wall and calculated the concentration profile of drugby numerical *** this paper,we give a steady-state analytical solution of the above model including *** obtained results are in agreement with the results of their numerical analysis. Moreover the analytical solution presented in this paper reveals the relation among the physiological parameters of the model and describes the basic absorption rule of drug and nutrient through the intestinal wall and hence pro- vides a theoretical basis for determining the permeability and reflection coefficient through in situ experiments.

关键词： drug and nutrient distribution and absorption in small intestine model and analytical solution

Stress Field Analyses of Functionally Gradient Ceramic Tool by FEM

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Journal of Materials Science & Technology 2001年第4期17卷 466-468页

作者： Ning FAN , Xing AI and Jun ZHAO department of Mechanical Engineering, Shandong university,{2. 2.0061, China Shandong Univ Dept Mech Engn Jinan 250061 Peoples R China

The cutting properties of the functionally gradient ceramic cutting tools relate closely to the gradient distribution. A cutting model of the functionally gradient ceramic tool is firstly designed in the present paper... 详细信息

关键词： Stress Field Analyses of Functionally Gradient Ceramic Tool by FEM Tool

Zeolite－Catalyzed　Friedel－Crafts　Acylation　of　Aromatics．Ⅳ．Nature　of　the　Active　Sites　of　Zeolites

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Chinese Chemical Letters 1996年第9期7卷 841-844页

作者： Yu Dao MA Qi Long WANG Wei JIANG Be Jun ZUO and Qin QIU(department of Chemistry,Shandong university,{2. 2.0100.)(department of Environmental Engineering, Shandong university,{2. 2.0100.) department of Chemistry Shandong University Jinan 250100 Dept. of Environmental Engineering Shandong University Jinan 250100

For zeolite-catalyzed Friedel-Crafts acylation of aromatic rings,the Lewis acid sites were found to be active;while the Bronsted acid sites with moderate strength were found to be inactive.

关键词： Nature Aromatics the Active

Existence and Uniqueness of Positive Solutions to Sublinear-Linear Initial Value Problems

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Acta Mathematica Sinica,English Series 1994年第1期10卷 19-29页

作者： Yang Enhao department of Mathematics jinan university Guangzhou,5102.5 China 1. department of Mathematics Jinan University 510275 Guangzhou China

Existence and uniqueness conditions for nonnegative solutions to initial value prob- lems of general sublinear-linear differential equations are *** extend the uniqueness theorem due to ***~[6] and the main results of... 详细信息

关键词： Existence and Uniqueness of Positive Solutions to Sublinear-Linear Initial Value Problems Math

A　Study　on　the　Simultaneous　Determination　of　Copper　and　Tin　in　the　Presence　of　Lead

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Chinese Chemical Letters 1996年第9期7卷 818-819页

作者： Xiao Li ZHANG Chi Min DU(department of Chemistry Shandong university, {2. 2.0100) SHANDONG UNIV DEPT CHEMJINAN 250100PEOPLES R CHINA

A very sensitive electrochemical procedure for trace determination of copper and tin in the presence of lead using cathodic adsorption voltammetry is *** complex of copper,tin with salicylfluorone (SAF) is adsorbed on the hanging mercury drop electrode (HMDE) and the reduction current of the accumulated complex is measured by *** method achieves the simultaneous determination of copper and tin,and has been applied to determine canned *** stripping voltarnmetry (ASV)is an effeCtive electroanajytital technique for themeasurement Of trace metal *** there are serious interferences due to overlapping strippingpeak and forming of intermetamc complex in complicated *** results are usUally notsatisfaCtory. The dffeulty of simultaneous determination Of copper and tin in the presence of leadis the strong tendency of tin (IV ) species to hydrolyZO and polwnerise as well as the overlap ofthe stripping Peaks of tin and lead by anodic stripping voltarnmetry at mercury electrodes. Inaddition, tin and copper easily created into intermetailic complex on HMDE and the tin peak isrestrained by copper;it is very dimcult to determine them,individually or *** approaches have been employed to improve the selectivity of tin measurement bystripping *** include prior separation['J, flow or medium--exchange schemes[2. orthe addtion Of surfactants' L3) We have determined Zr[4., Ga[sj, V['J, Sb[7) etc,by Cathodicstripping VOltammetry (csv) using nuorone claSs ligand as complexing *** this paper, wereport a hashly sensitive and selective stripping approach for sdriultaneous determination of copperand tin in the presence of lead' The method has been used to sampled of canned food.

关键词： Determination Tin

Origin of the Red Earth sequence on the northeastern Tibetan Plateau and its implications for regional aridity since the middle Miocene

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Science China Earth Sciences 2006年第5期49卷 505-517页

作者： WANG Xianyan1,7, LU Huayu1,2. JI Junfeg3, WANG Xiaoyong1,7, ZHAO Jingbo4. HUANG Baochun5 & LI Zhen6 1. SKLLQG, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710075, China 2. department of Urban and Resources Sciences, Nanjing university, Nanjing 2.0093, China 3. department of Earth Sciences, Nanjing university, Nanjing 2.0093, China 4. department of geography, Shaanxi Normal university, Xi’an 710062. China 5. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 10002., China 6 department of geography, Qinghai Normal university, Xining 810008, China 7. Graduate School of the Chinese Academy of Sciences, Beijing 100039, China 1. SKLLQG Institute of Earth Environment Chinese Academy of Sciences Xi’an 710075 China 7. Graduate School of the Chinese Academy of Sciences Beijing 100039 China 2. department of Urban and Resources Sciences Nanjing University Nanjing 210093 China 3. department of Earth Sciences Nanjing University Nanjing 210093 China 4. department of geography Shaanxi Normal University Xi’an 710062 China 5. Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China 6. department of geography Qinghai Normal University Xining 810008 China

The Red Earth deposit around Xining, northeastern Tibetan Plateau, has beenstudied in terms of soil micro-structure, grain-size distribution, major- and trace-elementchemistry and magne-tostratigraphy. Field investigations indicate that the Red Earth sequenceconsists of 2. visually definable yellow-brown and weakly-developed soils interbedded with reddishstrongly-developed soils, and has a similar structure to the aeolian Red Clay deposit on the ChineseLoess Plateau. Grain-size analysis shows that the Red Earth deposit is very fine-grained with anegligible sand fraction ( > 63 μm). Thin-section observations under light microscopy show that thedeposit has a clayey texture and the coarse fraction ( > 10 μm) mainly consists of quartz,feldspar and micas. Pyroxene and hornblende were also observed. This mineralogical composition ofthe coarse fraction is similar to that of the Quaternary loess. In addition, all of the mineralgrains are semi angular semi-angular and are generally finer than 63 μm. There is a good agreementbetween the major and minor trace element chemistry of loess-soil units and the Red Earth *** REE distributions of the loess-soil and the Red Earth deposit are similar in shape, withenriched LREE and fairly flat HREE profiles and a clear negative Eu anomaly. The geochemicalcharacteristics of the Red Earth deposit are also identical to those of upper continental crust,thus indicating a wind-blown origin. Magnetostratigraphic investigation shows that onset of the RedEarth deposition predates 11.4.Ma BP (13.6 Ma at a nearby site). The distribution of the reportedMiocene aeolian loess at Qin''an of the Loess Plateau is still unknown. Our results indicate thatthis aeolian deposit had extended to the northeastern Tibetan Plateau by at least the middleMiocene. The similarity of the element geochemistry between the Red Earth deposit and the overlyingloess shows that they may have similar sources and dynamic transport system, and may indicate thatthe

关键词： Red Earth deposit, Northeastern Tibetan Plateau, aeolian deposit, aridity of Asia, the middle Miocene.

Extraction of Surface Roughness from the Central δ-peak of Light Scattering Using a Multi-wavelength Ar~+ Laser

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Chinese Journal of Lasers 2000年第3期9卷 22-27页

作者： LIU Deli QI Dongping CHENG Chuanfu (department of Physics, Shandong Normal university, {2. 2.0014. China) 山东师范大学山东济南

In this paper, a new light scattering method for measuring t he roughness of random surfaces is proposed. The method is based on the relation between the specularly reflected intensity I s, i.e., the central δ-peak intensity and wave vector component k z. The linear fit of the logarithm graph of the normalized central δ-peak intensity I sr versus k-2.z, whose variation is induced by changing illuminating wavelength, gives the square of the surface roughness w. The roughnesses of 6 silicon backside samples were measured.

关键词： random surface roughness light scattering multi-wavelength

ZEOLITE－CATALYZED　FRIEDEL－CRAFTS　ACYLATION　OF　AROMATICS：I》．SYNTHESIS　OF　4.ACYL　ANISOLE　WITH　A　HY　CATALYST

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Chinese Chemical Letters 1996年第2期7卷 99-102页

作者： Qi Long WANG Yu Dao MA Xing Dong JI Hao YAN(department of Chemistry,Shandong university,{2., 2.0100)and Qin QIU(department of Environmental Engineering,Shandong university.,{2., 2.0100) department of Chemistry Shandong University Jinan 250100 China Dept. of Environmental Engineering Shandong University Jinan 250100 China

A series of aromatic ketones 4.acyl anisole were synthesized with high yield by using carboxylic acids as acylating agents and a HY zeolite as catalyst.

关键词： HY CATALYST WITH ANISOLE ACYLATION ACYL

A Hybrid of Theorems of Goldbach and Piatetski-Shapiro

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Chinese Annals of Mathematics,Series B 2006年第3期27卷 341-352页

作者： Xianmeng MENG Mingqiang WANG School of Computer Science and Technology, Shandong university, jinan 2.0100, China {2. of Statistics and Mathematics, Shandong Finance Institute, jinan 2.0014. China. School of Computer Science and Technology, Shandong university, jinan 2.0100, China {2. of Mathematics, Qufu Normal university, Qufu 2.3165, Shandong, China. School of Computer Science and Technology Shandong University Jinan 250100 China department of Statistics and Mathematics Shandong Finance Institute Jinan 250014 China department of Mathematics Qufu Normal University Qufu 273165 Shandong China

It is proved that for almost all sufficiently large even integers n, the prime variable equation n = p1 ＋ p2. p1 ∈ Pγ is solvable, with 13/15 〈γ≤ 1, where Pγ = {p ｜p = [m^1/γ], for integer m and prime p} is t... 详细信息

关键词： Circle method Sieve method Goldbach problem