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Geographical Agglomeration of Chinese Manufacturing Industries

中国人口·资源与环境：英文版 2007年第2期5卷 3-11页

作者： Zhang Hua 1, 2, Zheng Wei3.1. Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, beijing 100101, china 2. Graduate School of the Chinese Academy of Sciences, beijing 10003., china 3. School of Geography, beijing Normal university, beijing 100875, china Institute of Geographical Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China Graduate School of the Chinese Academy of Sciences Beijing 100039 China School of Geography Beijing Normal University Beijing 100875 China

Based on the plant level data from the First National Census of Basic Units, the Second National Census of Basic Units, and the First National Economic Census of china, this paper ex- amines the geographical agglomeration of Chinese manufacturing industries at a more disaggregated level both by industrial classi-fication and spatial unit analysis. Applying the agglomeration index proposed by Maurel and Sedillot, studies show that the most agglomerated industries are resource-intensive, and capital and technology intensive while industries demanding localized inputs or serving localized markets or favored by local governments are fairly dispersed. The more disaggregated industries are more spa- tially agglomerated. At the finer spatial scale, industries are more dispersed. Results indicate that within-county spillovers are stronger than nearby-county spillovers, and within-prefecture spillovers are stronger than nearby prefecture spillovers. Local- ized spillovers are still quite substantial at a range beyond that of counties. Comparing the agglomeration index of Chinese manu- facturing industries in 1996, 2001 and 2004, agglomeration seems to be a general tendency. Results also indicate that some industries have experienced remarkable changes in their levels of agglom- eration in the period 1996–2004.

关键词： industrial agglomeration manufacturing industries the MS index

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Sodium hydrosulfide alleviated pulmonary vascular structural remodeling induced by high pulmonary blood flow in rats

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Acta Pharmacologica Sinica 2006年第8期27卷 971-980页

作者： Xiao-hui LI~2 Jun-bao DU~(2,6) Ding-fang BU~3.Xiu-ying TANG~4 Chao-shu TANG~5 ~1Department of Pediatrics,peking university First Hospital,Key Laboratory of Molecular Cardiovascular Diseases,Ministry of Education ~3.Laboratory Center ~4Laboratory of Electron Microscopy,peking university First Hospital,beijing 10003.,{3. ~5Department of Physiology,peking university Health Science Center,beijing 100083.{3. Department of Pediatrics Peking University First Hospital Key Laboratory of Molecular Cardiovascular Diseases Ministry of Education Beijing China Laboratory Center Peking University First Hospital Beijing China Laboratory of Electron Microscopy Peking University First Hospital Beijing China Department of Physiology Peking University Health Science Center Beijing China

Aim:To explore the possible role of endogenous hydrogen sulfide （H2S）,a novelgasotransmitter,in the pathogenesis of pulmonary vascular structural remodeling（PVSR） induced by high pulmonary blood ***:Thirty-two Sprague-Dawley male rats were randomly divided into sham,shunt,sham+NaHS （a H2Sdonor） and shunt+NaHS *** in shunt and shunt+NaHS groups under-went an abdominal aorta-inferior vena cava shunt,and rats in shunt+NaHS andsham+NaHS groups were intraperitoneally injected with *** was inves-tigated using optical microscope and transmission electron *** H2S was evaluated by sulfide-sensitive *** oxide synthase（NOS）,heme oxygenase （HO-1）,proliferative cell nuclear antigen （PCNA） andextracellular signal-regulated kinase （ERK） activation were analyzed by ***:After 11 weeks of shunting,PVSR developed with a decrease inlung tissue H2S production and an increase in nitric oxide （NO）.However,lungtissue carbon monoxide （CO） did not *** the treatment with NaHS for11 weeks,H2S donor ameliorated PVSR and downregulated PCNA expression andERK activation with an increase in lung tissue CO production and HO-1 proteinexpression but a decrease in NO production,NOS activity and eNOS proteinexpression in shunted ***:H2S exerted a regulatory effect on PVSRinduced by high pulmonary blood ***,H2S down-regulated theERK/MAPK signal pathway,inhibited the NO/NOS pathway and enhanced theCO/HO pathway in rats with high pulmonary blood flow.

关键词： hydrogen sulfide pulmonary hypertension structure remodeling nitric oxide/nitric oxide synthase carbon monoxide/heme oxygenase

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Study on the changes of water cycle and its impacts in the source region of the Yellow River

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Science china(Technological Sciences) 2004年第Z1期47卷 142-151页

作者： ZHANG Shifeng1, JIA Shaofeng1, LIU Changming1, CAO Wenbing2, HAO Fanghua3. LIU Jiuyu4 & YAN Huayun5 1. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, beijing 100101, china 2. china {3. of Geosciences, beijing 100083. china 3. beijing Normal {3., beijing 100875, china 4. Bureau of Hydrology of Yellow River Conservancy Commission, Zhengzhou 450003. china 5. Bureau of Hydrology and Water Resource Investigation of Qinghai Province, Xining 810001, china Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing China china university of Geosciences Beijing China beijing Normal university Beijing China Bureau of Hydrology of Yellow River Conservancy Commission Zhengzhou China Bureau of Hydrology and Water Resource Investigation of Qinghai Province Xining China

The water cycle in the source region of the Yellow River underwent great changes in the 1990s. The major features of the changes are as follows: the gauged runoff declined significantly while the precipitation increased slightly, and the runoff process was more concentrated on the flood season. Water balance analyses indicate that the pondage was kept in the status of negative equilibrium, causing eco-environmental problems. The runoff decrement is due to evaporation increment in this region. Studies show that the runoff process in this region is closely related to that of the other hydrological stations in the upper reaches. When the runoff declines in the source regions, the amount of water also declines in the whole upper reaches of the Yellow River, affecting the balance between water demand and supply. Meanwhile changes will take place in the water cycle of the river course system when the eco-environment deteriorates. The trend of water cycle change in the source region is that the runoff will keep declining with the increment of evaporation caused by temperature rise in the northwest of china in the 21st century. But the hydraulic engineering in the source region will help to mitigate the deterioration of local eco-environment system, though the impacts to the lower reaches of this project may not be the case.

关键词： source region of the Yellow River, water cycle, evaporation, negative equilibrium.

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THE FUNCTION d_k(n) AT CONSECUTIVE INTEGERS

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Chinese Annals of Mathematics,Series B 1999年第4期20卷 473-478页

作者： MENG ZAIZHAO(Department of Mathematics, peking university, beijing 100871, china) Department of Mathematics Peking University Beijing 100871 China

Let dk(n) denote the k-fold iterated divisor function (k ≥ 2). It is proved that for sufficiently large x) dk(n) = dk(n + 1) holds for >> x(log log x)-3.integers n ≤x.

关键词： Divisor function Multiplicative function Congruence

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PDMS prism-glass optical coupling for surface plasmon resonance sensors based on MEMS technology

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Science china(Information Sciences) 2010年第10期53卷 2144-2158页

作者： GENG ZhaoXin 1,2 , LI Qing 3., WANG Wei 1 & LI ZhiHong 1 1 Institute of Microelectronics, peking university, beijing 100871, china 2 School of Information engineering, Minzu {3. of china, beijing 100081, china 3.School of Sciences, Changchun {3. of Science and Technology, Changchun 13.000, china Institute of Microelectronics Peking University Beijing China School of Information engineering Minzu University of China Beijing China School of Sciences Changchun University of Science and Technology Changchun China

A miniaturized surface plasmon resonance (SPR) chip has been developed for biomedical and chem-ical analysis with low cost and high performance. The techniques of bulk silicon micromachining and polymer replication were used to fabricate the Kretschmann SPR sensor composed of a Polydimethylsiloxane (PDMS) prism, a coupling glass and microchannels. The plasmon properties of thin metal films were investigated theoret-ically based on Fresnel analysis, with optical boundary conditions pertaining to the surface plasmon resonance at the gold/water and gold/air interfaces. The theoretical results show that difference in the refractive index (RI) between the PDMS prism and the coupling glass layer affect the precision of the SPR angle and the SPR curve. Meanwhile, the period of the interference fringe attaching on the SPR curve increases with an increase in wavelength and a decrease in the refractive index of the coupling glass layer. The gold thickness of 50 nm is required while employing a fixed incident wavelength of 650 nm, to achieve optimum SPR excitation conditions and the sensor sensitivity. The characteristics of this SPR sensor were evaluated in the angular interrogation mode of employing the incident wavelength of 650 nm in air and water media, respectively. The obtained SPR angles were approximately consistent with the theoretical ones.

关键词： surface plasmon resolance polymer microfluidic PDMS

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Influence of magnetic current on the ground state entanglement in an isotropic transverse XY chain

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Progress in Natural Science:Materials International 2007年第10期17卷 1147-1151页

作者： Liu Dan1,2 , Zhang Yong3.and Long Guilu1,2(1. Key Laboratory for Atomic and Molecular NanoSciences, and Department of Physics, Tsinghua university, beijing 100084, china 2. Center of Quantum Information Science and Technology, Tsinghua National Laboratory for information Science and Technology, beijing 100084, china 3. Institute of Physics, School of Sciences, beijing university of Posts and Telecommunications, beijing 100876, china) Key Laboratory for Atomic and Molecular NanoSciences Department of Physics Tsinghua University Beijing 100084 China Center of Quantum Information Science and Technology Tsinghua National Laboratory for Information Science and Technology Beijing 100084 China Institute of Physics School of Sciences Beijing University of Posts and Telecommunications Beijing 100876 China

We study the ground state entanglement in a three-qubit XY chain under the influence of a magnetization current. It is found that the ground state changes from a W state to a disentangled state as the magnetic field varies. When the Lagrange multiplier λ>3. namely under a strong magnetic current, the ground state holds onto a W state for a large range of the magnetic field strength. A phase transition to the magnetization-current phase occurs under a certain condition.

关键词： Heisenberg-XY chain magnetic-current phase transition.

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Population pharmacokinetics of valproate in Chinese children with epilepsy

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Acta Pharmacologica Sinica 2007年第10期28卷 1677-1684页

作者： De-chun JIANG~(2,3.,Li WANG~4,Yu-qin WANG~(2,6),Lin LI~3.Wei LU~5,Xiang-rong BAI~2~2 Department of Pharmacy,Xuan-wu Hospital of Capital Medical university,beijing 100053.china ~4 Department of Pediatrics,{3.First Hospital,beijing 10003.,china ~3.Department of Pharmacology,Xuan-wu Hospital of Capital Medical university,Education Ministry KeyLaboratory for Neurodegenerative Diseases,beijing 100053.china ~5 School of Pharmaceutical Science,{3.,beijing 100083.china Department of Pharmacy Xuan-wu Hospital of Capital Medical University Beijing China Department of Pharmacology Xuan-wu Hospital of Capital Medical University Education Ministry Key Laboratory for Neurodegenerative Diseases Beijing China Department of Pediatrics Peking University First Hospital Beijing China School of Pharmaceutical Science Peking University Beijing China

Aim:The aim of the present study is to establish a population pharmacokinetic（PPK） model of valproate （VPA） in Chinese epileptic children to promote thereasonable use of anti-epileptic ***:Sparse data of VPA serumconcentrations from 417 epileptic children were *** patients weredivided into 2 groups:the PPK model group （n=3.7） and the PPK valid group（n=100）.The PPK parameter values of VPA were calculated by NONMEM soft-ware using the data of the PPK model group.A basic model and a final modelwere set *** validate the 2 models,the concentrations of PPK valid groupwere predicted by each model,*** mean prediction error （MPE）,mean squared prediction error （MSPE）,root mean squared prediction error（RMSPE）,weight residues （WRES）,and the 95% confidence intervals （95%CI） were also ***,the values between the 2 models were ***:The PPK of VPA was determined by a 1-compartment model with afirst-order absorption *** basic model was:Ka=3.09 (h-1),V/F=20.4（L）,CL/F=0.296 （L/h）.The final model was:Ka=0.251+2.24·（1-HS）(h-1),V/F=2.88+0.157·WT （L）,CL/F=0.1060.98·CO+0.0157·AGE （L/h）.For thebasic model,the MPE,MSPE,RMSPE,WRES,and the 95% CI were-23.53.-3..3.,-16.70）,3.28.96 （2872.72,4585.20）,3..62 （3..3.,44.90）,and-0.06 （-0.14,0.02）,*** the final model,the MPE,MSPE,RMSPE,WRES,and the95% CI were-1.16 （-4.85,2.53.,1002.83.（1050.64,1143.61）,23.04 （21.12,24.96）,and0.08 （-0.04,0.20）,*** final model was more optimal than the ***:The PPK model of VPA in Chinese epileptic children wassuccessfully *** will be valuable to facilitate individualized dosageregimens.

关键词： population pharmacokinetics valproic acid epilepsy children Bayesian method NONMEM software individualized dosage regimens

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Archean relic body at lower crust in Sulu area:Evidence from magnetic data

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Chinese Science Bulletin 2003年第6期48卷 589-593页

作者： WU Qifan1,2, LU Fengxiang3. LIU Qingsheng3. ZHENG Jianping3. WANG Maoji2 & WU Wenli4 1. Department of Engineering Physics, Tsinghua university, beijing 100084, china 2. Aero Geophysical Survey & Remote Sensing Center, beijing 100083. china 3. china university of Geosciences, Wuhan 43.074, china 4. Institute of Geophysical & Geochemical Exploration, Langfang 065000, china Department of Engineering Physics Tsinghua University Beijing China Aero Geophysical Survey & Remote Sensing Center Beijing China china university of Geosciences Wuhan China Institute of Geophysical & Geochemical Exploration Langfang China

After the new 1︰1000000 aero magnetic data were processed and the three-dimensional inversion work was carried out, a vast high magnetic body northwestward was discovered. The magnetic body is located at the depth of about 20 km on the west side of Tanlu fault and at about 25 km on the east side of Tanlu fault beneath the Sulu area. There is a difference of vertical distance of 3.5 km in depth between both sides. We think that the magnetic body is an Archean metamorphic plate and belongs to the North china block. The discovery of the magnetic body is significant for us to reconstruct the structure model of the Sulu orogenic belt, delineate the suture of collision between the North china block and the Yangtze block, and estimate the depth of slipping surface when the eastside of Tanlu fault moved northward.

关键词：苏鲁地区地壳下层太古代残余体地球物理调查区域性磁场三维反演苏鲁造山带郯鲁断裂带大别-苏鲁超高压变质带

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Magnetic mineralogy of the Hongqiling Cu-Ni sulphide deposit: Implications for ore genesis

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Progress in Natural Science:Materials International 2007年第10期17卷 1192-1198页

作者： Xi Aihua1,2, Ge Yuhui1, Cai Yuanfeng2 and Zhang Xuefeng3.1. Faculty of Resources & Environment, Southwest Petroleum university, Chengdu 610500, china 2. State Key Laboratory for Endogenic Metal Deposit Research, Nanjing university, Nanjing 210093. china 3. Department of Natural Resources & Technology Information, china university of Petroleum, beijing 102249, china) Faculty of Resources and Environment Southwest Petroleum University Chengdu 610500 China State Key Laboratory for Endogenic Metal Deposit Research Nanjing University Nanjing 210093 China Department of Natural Resources and Technology Information China University of Petroleum Beijing 102249 China

Pyrrhotite is one of the common ore minerals in Cu-Ni sulphide deposits, but only monoclinic pyrrhotite is ferromagnetic at room temperature. X-ray and EPA analyses reveal that most pyrrhotite forming sideronitic texture in the Hongqiling Cu-Ni sulphide deposit is monoclinic, but that in the massive ore is a mixture of monoclinic and hexagonal pyrrhotites. Differential thermal and magnetic- thermogravimetric analyses of massive ore indicate a magnetic transition and heat absorption at 3.3., suggesting that this temperature is the thermomagnetic and phase transition point of pyrrhotite. For massive pyrrhotite ores heated at 400oC for 3. h and then quenched by cool water, the monoclinic pyrrhotite (mpo) transforms completely into the hexagonal pyrrhotite (hpo). However, all the pyrrhotites resulting from slow cooling of the sample in air are mpo. These results indicate that transformation between hpo and mpo depends upon the cooling rate. Therefore, massive ores in this deposit might have been formed via rapid cooling of ore melts. On the other hand, it is significant to study the effect of the ratio of the magnetite in total ores on the genesis of magmatic Cu-Ni suphide deposits.

关键词： pyrrhotite magnetite genesis of Cu-Ni sulphide deposit Hongqiling.

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Uniqueness and local stability for the inverse scattering problem of determining the cavity

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Science china Mathematics 2005年第8期48卷 1113-1123页

作者： FENG Lixin & MA Fuming lmam, School of Mathematical Sciences, peking university, beijing 100871, {3. School of Mathematical Sciences, Heilongjiang university, Harbin 150080, {3. School of Mathematical Sciences, Jilin university, Changchun 13.012, {3. lmam School of Mathematical Sciences Peking University Beijing China School of Mathematical Sciences Heilongjiang University Harbin China School of Mathematical Sciences Jilin University Changchun China

Considering a time-harmonic electromagnetic plane wave incident on an arbitrarily shaped open cavity embedded in infinite ground plane, the physical process is modelled by Maxwell's equations. We investigate the inverse problem of determining the shape of the open cavity from the information of the measured scattered field. Results on the uniqueness and the local stability of the inverse problem in the 2-dimensional TM (transverse magnetic) polarization are proved in this paper.

关键词： uniqueness, stability, Maxwell's equations, inverse scattering problem.

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