检索结果-南通市图书馆

surface Ferrite Grain Refinement and Mechanical Properties of Low Carbon steel Plates

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and steel Research International 2006年第4期13卷 35-39页

作者： fan Jian-wen DAI Xiao-li XIE Rui-ping ZHANG Wei-xu WANG Zu-bin shougang Research Institute of Technology Shougang Group Corporation Beijing 100041 China Chinese society for Metals Beijing 100011 China

Considering the specialities of the steel plate production, the TMCP study has been carried out with Gleeble 2000 tester to explore the possibility of fine grained ferrite in the low carbon steel plates with the chemical composition of C 0.13--0.18, si 0.12-0.18, Mn 0.50-0. 65, P 0. 010-0. 025, and s 0. 005-0. 028. The plates with thickness of 8. 7 mm in which the ferrite grain size is smaller than 8μm have been produced by special de- formation process in the laboratory. Furthermore, the trial production of special plain carbon steel plates of 16-25 mm in thickness and 2 000- 2 800 mm in width with fine grained ferrite has been successfully carried out in the shougang steel Plate Rolling Plant. The ferrite grain size is 5.5-7μm in the surface layers and 9.5-15μm in the central layer respectively. The yield strength is 320- 360 MPa, tensile strength is 440-520 MPa and the elongation is 25%- 34 %. It is very important for the rolling plants to improve the low carbon steel plates＇ mechanical properties. The results show that the ferrite grains in the surface layer can be refined effectively by the appropriate rolling process, and the strength can be also increased.

关键词： TMCP fine grained ferrite plain low carbon steel plate mechanical property

Finite Element - Artificial Transmitting Boundary Method for Acoustical Field on Tapered Waveguide

在线全文

学校读者我要写书评

暂无评论

光学学报 2003年第S1期23卷 167-168页

作者： J. s. Yang G F. fan J. P. Zhu C.K. sun Y. H. Zhu Department of Applied Physics Tianjin University P.R.ChinaDepartment of Applied Physics Tianjin University P.R.ChinaDepartment of Applied Physics Tianjin University P.R.ChinaDepartment of Applied Physics Tianjin University P.R.ChinaDepartment of Applied Physics Tianjin University P.R.China

In earlier approach, the 2-D acoustical field profiles on the substrate region are often calculated with BPM. In this paper, we present a new approach based on the finite element -artificial transmitting boundary meth... 详细信息

关键词： for in of AOTF on Artificial Transmitting Boundary Method for Acoustical Field on Tapered Waveguide Finite Element

A dye-sensitized solar cell based on PEDOT:Pss counter electrode

在线全文

学校读者我要写书评

暂无评论

Chinese science Bulletin 2013年第4期58卷 559-566页

作者： YUE GenTian WU JiHuai XIAO YaoMing LIN JianMing HUANG MiaoLiang fan LeQing YAO Ying Engineering Research Center of Environment-Friendly Functional Materials Ministry of Education Institute of Materials Physical Chemistry Huaqiao University

A counter electrode for dye-sensitized solar cell (DssC) was prepared by coating poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:Pss) with high transparency and adhesion on a conducting FTO glass at low temperature. The surface morphology, conductivity, sheet resistance, redox properties and photoelectric properties of the PEDOT:Pss/carbon electrodes were observed using scanning electron microscopy, a four-probe tester and a CHI660D electrochemical measurement system. The experimental results showed that DssCs had the best photoelectric properties for PEDOT:Pss/carbon counter electrodes annealed at 80°C under vacuum conditions. The overall energy conversion efficiency of the DssC with PEDOT:Pss/carbon counter electrode and barrier layer reached 7.61% under irradiation from a simulated solar light with intensity of 100 mW/cm2 (AM 1.5). The excellent photoelectric properties, simple preparation procedure and low cost allow the PEDOT:Pss/carbon electrode to be a credible alternative electrode for use in DssCs.

关键词：染料敏化太阳能电池 PEDOT 碳电极 Pss 扫描电子显微镜乙撑二氧噻吩四探针测试仪光电性能

Novel trichromatic phosphor Co-doped with Eu, Tb in siO_2 gel matrix

在线全文

学校读者我要写书评

暂无评论

Chinese science Bulletin 2007年第4期52卷 444-449页

作者： HU XiaoYun fan Jun LI Ting ZHANG DeKai BAI Jinmao REN ZhaoYu HOU Xun Department of Physics Northwest University Xi'an 710069 China Chemical Engineering College Northwest University Xi'an 710069 China Institute of Photonics & Photon-Technology and Provincial Key Laboratory of Photo Electronic Technology Northwest University Xi'an 710069 China state Key Laboratory of Transient Optics and Technology Xi'an Institute of Optics & Precision Mechanics Chinese Academy of Sciences Xi'an 710068 China

The Eu, Tb co-doped siO2 matrix tricolor fluorescence system was prepared by sol-gel technique. Red emission at 618 nm, green emission at 543 nm and blue emission at 350―500 nm were observed in the PL spectra of the sample, indicating that Eu3+, Eu2+ and Tb3+ ions coexisted in the matrix. In the co-doped sample, the blue emission of Eu2+ was much stronger than that of the sample single doped with Eu, which implied that the electron transfer between Eu3+ and Tb3+ maybe happened in the siO2 matrix. The influences of the annealing temperature and Tb concentration on the PL spectra of the samples were investigated. The optimal doped concentration of Tb was determined to be 0.2% and the optimal annealing temperature 850℃. Annealed at 600℃, Tb3+ had a sensitizing effect on Eu3+ in the siO2 matrix, and the emission intensity of Eu3+ in the Eu, Tb co-doped sample was more than four times that of the single doped sample, which could be attributed to the energy transfer from Tb3+ to Eu3+.

关键词：二氧化硅凝胶基质三原色荧光系统稀土铕铽磷光粉共掺杂电子传递能量传递

Effect of the shelterbelt along the Tarim Desert Highway on air temperature and humidity

在线全文

学校读者我要写书评

暂无评论

Chinese science Bulletin 2008年第S2期53卷 41-52页

作者： WANG HaiFeng LEI JiaQiang LI shengYu fan JingLong LI YingGang sUN shuGuo CHANG Qing Xinjiang Institute of Ecology and Geography Chinese Academy of SciencesUrumqi 830011China Graduate University of Chinese Academy of sciences Beijing 100049China

The temperature and humidity of the shelterbelt micro-climate on both horizontal and vertical scales in the extremely drought area were measured with multiple HOBO temperature and humidity automatic observation equipments in the hinterland of the Taklimakan Desert. The results show that the shelterbelt ecosystem of the desert highway plays typical micro-climate adjustment rolesin stabilizing surface air temperature and increasing air humidity, and so on. solar radiation significantly affects both temperature and humidity of surface layers, and it has a positive correlation with the temperature but a negative correlation with the air humidity. When it is cloudy, the weather has a great impact on keeping temperature and humidity in the shelterbelt. The shelterbelt also significantly influences the environment, and the micro-climate in the belt has an obvious characteristic of cooling and humidification: compared with the original sand area, the temperature in the shelterbelt is always lower and the humidity is always higher. Moreover, the temperature range at the shelterbelt edge is greater than that in the sand area, but the humidity is always higher. Our conclusion is that the vertical-effect range of temperature of the shelterbelts is 4 -10 m, and the humidity range is 6 to 8 m; the horizontal-effect range of temperature is 16 m and the humidity range is about 24 m.

关键词： shelterbelt extremely drought area micro-climate temperature and humidity boundary

smoking and the risk of dry eye: a Meta-analysis

在线全文

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2016年第10期9卷 1480-1486页

作者： Li Xu Wei Zhang Xiao-Yu Zhu Tao suo Xian-Qun fan Yao Fu Department of Ophthalmology Ninth People's HospitalShanghai Jiao Tong University School of Medicine Department of Health statistics and social Medicine School of Public HealthFudan University Department of Ophthalmology and Vision science EyeEarNose and Throat HospitalShanghai Medical CollegeFudan University Department of General surgery Zhongshan HospitalInstitute of General SurgeryFudan University

AIM： To collect the evidence to estimate the correlation between smoking and the incidence of dry eye. METHODs： The Pub Med,EMBAsE,the Cochrane Central Register of Controlled Trials（CENTRAL,last issue）,CBM（Chinese Bio Medical Literature Database）,and CNKI（China National Knowledge Infrastructure/Chinese Academic Journals full-text Database） were searched for eligible studies published from January1964 to December 2015 to investigate the association of smoking with the risk of dry *** odds ratio（OR）and 95% confidence interval（CI） were summarized and *** extracted studies were pooled by the fixed-effects model or a random-effects model. REsULTs： Two cohort studies and eight cross-sectional surveys were included in our *** was no statistically significant relationship between current（OR=1.32; 95% CI： 0.99-1.76; P=0.055）or ever smoking（OR=1.12; 95% CI： 0.98-1.28; P=0.107）and the risk of dry eye among the studies,even when age and gender were adjusted（OR=1.16; 95% CI： 0.83-1.64; P=0.383）.In the sensitivity analysis in which only general population were included,the association was significant between smoking and dry eye（OR=1.50; 95%CI： 1.08-2.09; P=0.016）.CONCLUsION： This Meta-analysis suggests that smoking may associate with the risk of dry eye in general population.

关键词： dry eye smoking Meta-analysis

Preparation of Copper Phthalocyanine Crystals Using solvothermal synthesis

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2008年第4期24卷 407-410页

作者： XIA Dao-cheng LI Wan-cheng WANG Xu YU shu-kun fan Cui-xiang MA Chun-yu CHENG Chuan-hui fan Zhao-qi DU Guo-tong CONG fang-di DU Xi-guang state Key Laboratory of Materials Modification by Laser Ion and Electron Beams Dalian University of Technology Dalian 116023 P R. China Chemistry Depatment of Yuncheng University Yuncheng 044000 P R. China state Key Laboratory on Integrated Optoelectronics Jilin University Changchun 130012 P R. China state Key Laboratory for superamolecular structure and Materials Jilin University Changchun 130012 P R. China Faculty of Chemistry Northeast Normal University Changchun 130024 P. R. China

A novel solvothermal synthesis method for the direct growth of B-form crystals of copper phthalocyanine（CuPc） is presented in this article. With quinoline as solvent, crystals were grown after cooling the reaction mixture of 1,3-diiminoisoindoline and copper oxide, heated for 9 h at 270 ℃, to room temperature in an autoclave. These high quality crystals were suitable for characterization measurements. The single-crystal diffraction data show a monoclinic system unit cell： a=1.4668（3） nm, b=0.48109（10） nm, c=1.9515（7） nm, a=90°, B=121.04（2）°, r=90°, where the corresponding cell volume is 1.17991 nm^3. Needle-like single crystals of CuPc up to 10.5 mm in length were obtained. The influences of different temperatures, reaction time and solvent volume on the crystal yields were also discussed. Optimum reaction conditions were 10 mL of quinoline, at 270 ℃ for 8 h.

关键词： solvothermal synthesis single crystal CuPc Quinoline solvent Autoclave

The discovery of interfacial electronic interaction within cobalt boride@MXene for high performance lithium-sulfur batteries

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2021年第7期32卷 2249-2253页

作者： Bin Guan Xun sun Yu Zhang Xian Wu Yue Qiu Maoxu Wang Lishuang fan Naiqing Zhang state Key Laboratory of Urban Water Resource and Environment School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001China Academy of Fundamental and Interdisciplinary sciences Harbin Institute of TechnologyHarbin 150001China

Lithium-sulfur battery is strongly considered as the most promising next-generation energy storage system because of the high theoretical specific *** serious"shuttle effect"and sluggish reaction kinetic limited the commercial application of lithium-sulfur *** hetero structure s were applied to accelerate polysulfides conversion and suppress their migration in lithium-sulfur ***,the effect of the interface in heterostructure was not ***,the Co_(2)B@MXene heterostructure is synthesized through chemical reactions at room temperature and employed as the interlayer material for Li-s *** theoretical calculations and experimental results indicate that the interfacial electronic interaction of Co_(2)B@MXene induce the transfer of electrons from Co_(2)B to MXene,enhancing the catalytic ability and favoring fast redox kinetics of the polysulfides,and the theoretical calculations also reveal the underlying mechanisms for the electron transfer is that the two materials have different Fermi energy *** cell with Co_(2)B@MXene exhibits a high initial capacity of1577 mAh/g at 0.1 C and an ultralow capacity decay of 0.0088%per cycle over 2000 cycles at 2 *** at5.1 mg/cm^(2) of sulfur loading,the cell with Co_(2)B@MXene delivers 5.2 mAh/cm^(2) at 0.2 C.

关键词： Co_(2)B@MXene separator Interfacial electronic interaction Catalytic activity Lithium-sulfur batteries

Correlation study of biological characteristics of non-small cell lung cancer A549 cells after transfecting plasmid by microbubble ultrasound contrast agent

在线全文

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Medicine 2016年第6期9卷 564-567页

作者： Xuan-Yan Guo Man-Lu Xue-Qing Chen fan-Ding He Ang-Li Ultrasonic Department Academy of Sciences of Sichuan Province People's Hospital of Sichuan Province Pancreatic surgery West China Hospital Sichuan University

Objective: To explore the role of the abnormal expression of miRNAs in the development process of non-small cell lung cancer and the feasibility of ultrasound microbubble-mediated gene therapy after transfecting antisense miRNA-224 and miRNA-122 a plasmids into nonsmall cell lung cancer A549 cells. Methods: Antisense miRNA-224 and miRNA-122 a plasmids were transfected into non-small cell lung cancer A549 cells on the optimal ultrasound microbubble mediated condition. We set up a control group. The cell proliferation activity, apoptosis, invasion ability were detected by MTT assay, Annexin V-PE, Transwell invasion experiment and colony formation assay, respectively. Results: The expression of mi RNA-224 decreased and the expression of miRNA-122 a rose after the plasmids of target genes were transfected into non-small cell lung cancer A549 cells, and there were significant differences when compared with those of the control group(Psmids of target genes were transfected into A549 cells, the growth of antisense miRNA-224 and miRNA-122 a were inhibited, and the differences were significant as compared with the control group(P sides, the inhibition of miRNA-122 a group was the most significant and there was statistically significant difference as compared with miRNA-224 group(t =-4.694, P = 0.009). After the plasmids of target genes were transfected into A549 cells, the proportion of apoptotic cells increased, the invasive cells were decreased and the clone ability reduced, and also there was a significant difference as compared with those of the control group(P s more, the apoptotic peak appeared in miRNA-122 a group. Its invasion ability decreased most obviously(40.25 ± 3.97/visual field), the number of clone ability was 104.93 ± 4.87 and the inhibitory effect was the most obviously. There was statistically significant difference as compared with other groups(P sions: A549 cells transfected by ultrasound micro

关键词： Microbubble ultrasound contrast agent MiR-224 MiR-122a Non-small cell lung cancer