检索结果-南通市图书馆

Study on activated carbon in chromium-containingwastewater treatment by XPS

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 1994年第2期6卷 173-179页

作者： Yang Jun Wang Yunxiu(shandong University of Technology,jinan 250014, china)Zhang Yinsheng(shandong Non-Metallic Material research institute,jinan 250014, china)

The mechanism of activated carbon treatment with chromium-containing wastewater byX-ray photoelectron spectroscopy (XPS) and that of adsorption and reduction reaction of the acti-vated carbon with hexavalent chromium solution are presented in this paper. The XPS results showthat at PH6,the main process is adsorption of the car-bon to Cr(VI). The optimum range of treatment is at pH 3-6,in which removal efficiency ofadsorption and reduction is relatively high. It demonstrates that the reduction mechanism is aheterogeneous acid catalysis process.

关键词： wastewater treatment X-ray photoelectron spectrometry activated carbon.

Demagnetization Process and Coercivity for Anisotropic HDDR NdFeB Bonded Magnets

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2000年第4期16卷 445-446页

作者： Ruwei GAO and Jiancheng ZHANG (Physics Department, shandong University, jinan 250100, china) Xianhong DENG and Yongjun ZHANG (shandong Metallurgical research institute, jinan 250014, china) Physics Department Shandong University Jinan 250100 China shandong Metallurgical research institute Jinan 250014 China

The demagnetization process and the coercivity mechanism for amsotropic HDDR Nd(Fe,Co)B bonded magnets were studied by comparing the dependence of coercivity on the alignment field applied while the powders were pressed. The results showed that both the remanence and the coercivity of magnet increased with increasing alignment field. The demagnetization process of the magnet can be classified as the nucleation process inside the grains and the domain-wall motion between the grains. The combined effect of two processes determines the coercivity of HDDR NdFeB bonded magnets.

关键词： NdFeB HDDR Demagnetization Process and Coercivity for Anisotropic HDDR NdFeB Bonded Magnets

Genetic diversity of the endangered species Rosa rugosa *** china and implications for conservation strategies

在线全文

学校读者我要写书评

暂无评论

Journal of Systematics and Evolution 2009年第6期47卷 515-524页

作者： ~1Ji-Hong YANG ~1Shu-Ping ZHANG ~2Jian LIU ~1Wen ZHAI ~(1,2)Ren-Qing WANG~* 1(School of Life Sciences,shandong University,jinan 250100,china) 2(institute of Environment research,shandong University,jinan 250100,china) (School of Life Sciences Shandong University Jinan 250100 China) (institute of Environment research Shandong University Jinan 250100 China)

Rosa rugosa *** one of the dominant and important shrub species in estuary dunes and shingle beaches of northern ***,its area of distribution,the number of populations,and the size of each population have decreased rapidly in the past two decades because of habitat degradation and *** amplified polymorphic DNA markers were used to determine the genetic diversity of four remaining large natural populations of *** and to discuss an effective conservation strategy for this endangered species in *** genetic variations were detected in *** populations in *** mean percentage of polymorphic loci(P%) within four local populations was 57.99%,with the P%of the total population being 75.30%.Mean Shannon’s information index(H0) was 0.2826,whereas total H0was *** genetic differentiation among populations was 0.1878, which indicates that most genetic diversity occurs within *** Tumenjiang(TMJ) showed the highest genetic diversity(P%= 66.27%;H0= 0.3117) and contained two exclusive *** Changshandao (CSD) showed higher genetic diversity(P%= 59.04%;H0= 0.3065).Populations TMJ and CSD contained 95.33% and 99.33%,respectively,of loci with moderate to high frequency(P>0.05) of the total *** results indicate that populations TMJ and CSD should be given priority for in situ conservation and regarded as seed or propagule sources for ex situ *** results of the present study also suggest that *** in china has become endangered as a result of human actions rather than genetic depression of populations;thus,human interference should be absolutely forbidden in *** habitats.

关键词： china genetic diversity in situ conservation random amplified polymorphic DNA(RAPD) Rosa rugosa

Conduction Properties and Scattering Mechanisms in F-doped Textured Transparent Conducting SnO_2 Films Deposited by APCVD

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 1997年第1期13卷 50-56页

作者： Deheng ZHANG(Dept. of Physics, shandong University, jinan 250100, china)Honglei MA(institute of Optoelectronic Materials and Devices, shandong University, jinan 250100, china) Dept. of Physics Shandong University Jinan 250100 China institute of Optoelectronic Materials and Devices Shandong University Jinan 250100 China

Transparent conducting F-doped texture SnO2 films with resistivity as low as 5× 10-4 Ω ·cm,with carrier concentrations between 3.5 × 1020 and 7× 1020 cm-3 and Hall mobilities from 15.7 to 20.1 cm2/(V/s) have been prepared by atmosphere pressure chemical vapour deposition (APCVD). These polycrystalline films possess a variable preferred orientation, the polycrystallite sizes and orientations vary with substrate temperature. The substrate temperature and fluorine flow rate dependence of conductivity, Hall mobility and carrier conentration fOr the resultingfilms have been obtained. The temperature dependence of the mobiity and carrier concentrationhave been measured over a temperature range 16～400 K. A systematically theoretical analysis on scattering mechanisms for the highly conductive SnO2 films has been given. Both theoretical analysis and experimental results indicate that for these degenerate, polycrystalline SnO2 ：F films in the low temperature range (below 100 K), ionized impurity scattering is main scattering mechanism. However, when the temperature is higher than 100 K, the lattice vibration scattering becomes dominant. The grain boundary scattering makes a small contribution to limit the mobility of the films.

关键词： SnO cm Conduction Properties and Scattering Mechanisms in F-doped Textured Transparent Conducting SnO2 Films Deposited by APCVD

Studies on Ion-molecule Reaction of Disubstituted Benzene with Ion System of Acetyl Chloride in Gas Phase

在线全文

学校读者我要写书评

暂无评论

Chemical research in Chinese Universities 2000年第4期16卷 334-340页

作者： LI Zhi-li (shandong Non-metallic Material research institute, jinan 2.003., P. R. china) 山东省非金属材料所山东济南 250031

The ion-molecule reactions of disubstituted benzenes with the ion system of acetyl chloride under the chemical ionization condition were examined and the fragmentation reactions of the adduct ions formed by the ion-molecule reactions were studied by using collision-induced dissociation technique. It was found that the electron-releasing groups favored the adduct reactions and the electron-withdrawing groups did not. The position and properties of substituting groups had an effect on the relative abundance of the adduct ions. The fragmentation reaction of the adduct ions formed by ortho-benzene diamine with the acetyl ion was similar to the reductive alkylation reaction of amine in condensed phase.

关键词： Disubstituted benzene Ion-molecule reaction Collision-induced dissociation technique Adduction

Cloning,Sequencing and Expression Analysis of the First Cellulase Gene Encoding Cellobiohydrolase 1 from a Cold-adaptive Penicillium chrysogenum FS010

在线全文

学校读者我要写书评

暂无评论

Acta Biochimica et Biophysica Sinica 2007年第2期39卷 101-107页

作者： Yunhua HOU~(1,2) Tianhong WANG~1 Hao LONG~1 and Huiynan ZHU~(1,2) ~1State Key Laboratory of Microbial Technology,shandong University,jinan 250100,china ~2Department of Food and Biologic Engineering,shandong institute of Light Industry,jinan 250323,china State Key Laboratory of Microbial Technology Shandong University Jinan 250100 China Department of Food and Biologic Engineering Shandong Institute of Light Industry Jinan 250323 China

A cellobiohydrolase 1 gene (cbhl) was cloned from Penicillium chrysogenum FS010 by amodified thermal asymmetric interlaced polymerase chain reaction (TAIL-PCR).DNA sequencing showsthat cbhl has an open reading frame of 1590 bp, encoding a putative protein of 529 amino acid *** amino acid sequence revealed that CBHI has a modular structure with a predicted molecular massof 56 kDa and consists of a fungal type carbohydrate binding module separated from a catalytic domain bya threonine rich linker *** putative gene product is homologous to fungal cellobiohydrolases inFamily 7 of the glycosyl hydrolases.A novel cbhl promoter (1.3 kb) was also cloned and sequenced,whichcontains seven putative binding sites (5'-SYGGRG-3') for the carbon catabolite repressor *** ofvarious carbon sources to the cbhl transcription of *** was examined by Northern analysis,suggesting that the expression of cbhl is regulated at transcriptional *** cbhl gene in cold-adaptivefungus *** was expressed as an active enzyme in Saccharomyces cerevisiae *** recombinantCBHI accumulated intracellularly and could not be secreted into the medium.

关键词： Penicillum chrysogenum cellobiohydrolase TAIL-PCR promoter of cbh1

DFT study of the conductance of molecular wire:The effect of coupling geometry and intermolecular interaction on the transport properties

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science china Chemistry 2006年第6期49卷 492-498页

作者： QI Yuanhua1,2, GUAN Daren1 & LIU Chengbu1 1. institute of Theoretical Chemistry, shandong University, jinan 250100, china 2. School of Physics and Microelectronics, shandong University, jinan 250061, china institute of Theoretical Chemistry Shandong University Jinan China School of Physics and Microelectronics Shandong University Jinan China

The density functional theory (DFT) combining with the non-equilibrium Green functions (NEGF) method is applied to the study of the electronic transport properties for a Di-thiol-benzene (DTB) molecule coupled to two Au(111) surfaces. The dependence of the transport properties on the bias, the coupling geometry of the molecule-electrode interface, and the intermolecular interaction are examined in detail. The results show that the existence of the hydrogen atom at the end of the DTB molecule would significantly decrease the transmission coefficients, and then the differential conductance (dI/dV). By changing the position of the DTB molecule located between two electrodes a maximum value of calculated current is observed. It is also found that the intermolecular interaction will strongly influence the transport properties of the system studied.

关键词： non-equilibrium Green functions method, transmission spectrum, the molecular projected selfconsistent Hamiltonian, projected density of state.

Survey on normal distributions,central limit theorem,Brownian motion and the related stochastic calculus under sublinear expectations

在线全文

学校读者我要写书评

暂无评论

Science china Mathematics 2009年第7期52卷 1391-1411页

作者： PENG ShiGe institute of Mathematics,shandong University,jinan 250100,china institute of Mathematics Shandong University Jinan China

This is a survey on normal distributions and the related central limit theorem under sublinear *** also present Brownian motion under sublinear expectations and the related stochastic calculus of It's *** results provide new and robust tools for the problem of probability model uncertainty arising in financial risk,statistics and other industrial problems.

关键词： probability and distribution uncertainty normal distribution Brownian motion central limit theorem 60H10 60H05 60H30 60E05 60E07 62C05 62D05

Efficient Differentiation of Embryonic Stem Cells into Neurons in Glial Cell-conditioned Medium under Attaching Conditions

在线全文

学校读者我要写书评

暂无评论

Acta Biochimica et Biophysica Sinica 2005年第7期37卷 480-487页

作者： Hai-Bin TIAN~(1,2) Zeng-Liang BAI~1 Hong WANG~2 Jian-Quan CHEN~2 Guo-Xiang CHENG~2 1 institute of Development Biology,School of Life Science,shandong University,jinan 250100,china 2 Shanghai Transgenic research Center,Shanghai 201203,china institute of Development Biology School of Life Science Shandong UniversityJinan 250100 China Shanghai Transgenic research CenterShanghai 201203 China

Embryonic stem (ES) cells can differentiate into neurons in vitro,which provides hope for thetreatment of some neurodegenerative diseases through cell ***,it remains a challengeto efficiently induce ES cells to differentiate into ***,we show that murine ES cells can efficientlydifferentiate into neurons when cultured in glial cell-conditioned medium (GCM) under attaching conditionswithout the formation of embryoid *** comparison with murine embryonic fibroblast-conditionedmedium,we found that GCM has a positive effect on limiting the generation of non-neuronal cells,such *** addition,compared with suspension conditions,attaching conditions delay the differentiationprocess of ES cells.

关键词： embryonic stem cell glial cell-conditioned medium differentiation neuron attaching conditions