检索结果-南通市图书馆

Petroleum Science 2023年第4期20卷 2545-2553页

作者： Tian-Han Zhu mei Zhang sheng-Nan Li Feng Li Hua Song Provincial Key Laboratory of Oil&Gas Chemical Technology College of Chemistry&Chemical EngineeringNortheast Petroleum UniversityDaqingHeilongjiang163318China Guangzhou Institute of Energy Conversion Chinese Academy of SciencesGuangzhouGuangdong510640China

The non-noble metal modified sulfated zirconia was found easy to ***,highly active and highly stable non-noble core-shell Ni-S_(2)O_(8)^(2−)/Al_(2)O_(3)@ZrO_(2) catalysts(Ni-SA@Z-x,x=Al content in wt%)have been successfully prepared and investigated for n-pentane *** results showed that the core-shell Ni-SA@Z-30 provided a sustained high isopentane yield(63.1%)with little or no deactivation within 5000 min at a mild reaction pressure of 2.0 MPa,which can be attributed to the following factors:(i)carbon deposition was greatly suppressed by the large pore size and huge pore volume;(ii)the loss of sulfur entities was suppressed because the small and highly dispersed tetragonal ZrO_(2) particles can bond with the S species strongly;(iii)strong Brønsted acidity can be maintained well after the *** pore structures and acid nature of the core-shell Ni-SA@Z-x are entirely different from those of the normal structure Ni-S_(2)O_(8)^(2−)/ZrO_(2)-Al_(2)O_(3),even though the Al content and the compositions of the individual components are the *** Al_(2)O_(3)cores endow the catalysts with high internal surface area and high mechanical ***,the ZrO_(2) shell,which consists of more and smaller tetragonal ZrO_(2) particles because of the large surface area of the Al_(2)O_(3)core,promotes the formation of more stable sulfur species and stronger binding sites.

关键词： Core-shell Large pore size Solid superacid Non-noble metal Ni Isomerization

Simulation of Grey Scale Ghost Imaging By Labview

在线全文

学校读者我要写书评

暂无评论

南京邮电大学学报（自然科学版） 2011年第2期31卷 94-99页

作者： DING Jian ZHAO sheng-mei Institute of Signal Processing and Transmission Nanjing University of Posts and Telecommunications Nanjing 210003 China

In this paper,we present a simulation method to reconstruct the object's imaging in a ghost-imaging *** use Laguerre-Gaussian(LG) beam as the light source which will produce the Orbital Angular Momentum(OAM) *** the signal arm,the object spatial information is encoded as phase,and added to the phase of the signal *** the idler arm,the phase of the idler light is changed according to the maximum coincidence rate in the *** get each pixel matched phase of the object and reconstruct the object's imaging in the idle *** demostrate some examples of the reconstruction and compare with the other reported *** results show that our method can improve the resoltuion of the image effectively.

关键词： orbital angular momentum coincidence rate ghost imaging grey scales

Fuzzy Evaluation of Coal Seam Geological Condition of Fully-Mechanized Face in Ten-Million-Ton Mine

在线全文

学校读者我要写书评

暂无评论

Journal of China University of Mining and Technology 2005年第3期15卷 208-212页

作者： LI Wei-min DONG Guo-wei WANG Hong-sheng FENG mei-mei School of Mineral and Safety Engineering China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China Jisan Mine of Yanzhou Mining Group Jining Shandong 272100 China

Based on coal seam geological condition and mining technological characteristic in Jisan Mine, coal seamgeological condition is quantitative evaluated by using fuzzy evaluation with the view of coal mining and coalfaceproduction. The structure and index system of evaluation factor, the membership functions and weights of evaluationfactor, evaluation model and reliability in the coal seam geological conditions are expounded in detail. Eighty-twocoalfaces which will be exploited is classified. All of these have provided a theoretical foundation for the selection ofcoal mining technology and for sustainable development of the coal mine.

关键词： fuzzy evaluation membership function ten-million-ton mine

Crystal Structure of Bis(O,O′-diisopropyl dithiophosphate): [(C_3H_7O)_2PS_2]_2

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2004年第2期20卷 146-148页

作者： ZHANGShu-sheng LIXue-mei WANGJin-li WANJun JIAOKui CollegeofChemistryandMolecularEngineering QingdaoUniversityofScienceandTechnologyQingdao266042P.R.China

The crystal and molecular structures of [(C 3H 7O) 2PS 2] 2(CCDC No.217201) were determined by means of X-ray crystallography. It crystallized in a triclinic system with space group P1 and lattice parameters a=0.82794(3) nm, b=0.84764(2) nm, c=0.85034(3) nm, α=97.78(3)°, β=110.77(3)°, γ=94.95(3)°, V=0.54701(9) nm3, Z=1. In this molecule, the two diisopropyl dithiophosphate groups, [(C 3H 7O) 2PS 2] 2, which are parallel to each other, are linked by an S—S bond and there exist inversion centers in the molecule. In the structure, the PS bonds in the two dithiophosphate units are trans-oriented to each other.

关键词： X-ray crystallography Dithiophosphate Centrosymmetry

Experimental and Theoretical Study of Reactions between Manganese Oxide Cluster Cations and Hydrogen Sulfide

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Physics 2013年第6期26卷 679-686,I0003,I0004页

作者： mei-ye Jia sheng-gui He Mao-fa Ge Beijing National Laboratory for Molecular Sciences (BNLMS) State Key Laboratory for Structural Chemistry of Unstable and Stable Species Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China

Manganese oxide cluster cations Mnm180n＋ were prepared by laser ablation and reacted with hydrogen sulfide （H2S） in a fast flow reactor under thermal collision conditions. A time-of-flight mass spectrometer was used to detect the cluster distributions before and after the interactions with H2S. The experiments suggest that oxygen-for-sulfur （O/S） ex- change reaction to release water took place in the reactor for most of the manganese oxide cluster cations： MnmlSOn＋＋H2S→Mnm18On-1S＋＋H218O. density functional theory cal- culations were performed for reaction mechanisms of Mn202＋＋H2S, Mn203＋＋H2S, and Mn204＋＋H2S. The computational results indicate these O/S exchange reactions are both thermodynamically and kinetically favorable, thus in good agreement with the experimental observations. The O/S exchange reactions identified in this gas-phase cluster study parallel similar behavior of related condensed phase reaction systems.

关键词： Cluster Oxygen-for-sulfur exchange Reaction mechanism Mass spectrometry density functional theory

Ab initio Study on Structures and Isomerization of Magnesium Fluorosilylenoid H2SiFMgF

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Physics 2008年第6期21卷 541-546页

作者： Yi-jian Zhang mei-jiang Li Guo-qiao Lai Da-cheng Feng sheng-yu Feng Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education Hangzhou Normal University Hangzhou 310012 China School of Chemistry and Chemical Engineering Shandong University Ji'nan 250100 China

The structures and isomerization of magnesium fluorosilylenoid H2SiFMgF were investigated by ab initio molecular orbital theory. Four equilibrium structures and three isomeric transition states were located and fully optimized at the B3LYP/6-31G（d,p） and G3MP2B3 levels, respectively. Based on the B3LYP/6- 31G（d,p） optimized geometries, harmonic frequencies of various structures were obtained and 29Si chemical shifts were calculated. The solvent effects were investigated by means of the polarizable continuum model using THF as a solvent at B3LYP/6-31G（d,p） level. Isomerization paths for isomers were confirmed by intrinsic reaction coordinate calculations. The calculated results show that tetrahedral structure has the lowest energy and is the most stable; tetrahedral, three-membered ring, and p-complex structures are suggested to be the experimentally detectable ones; and a-complex structure has the highest energy and will not exist.

关键词： Magnesium fluorosilylenoid Ab initio calculation B3LYP/6-31G(d p) theory Isomerization

Formation and structure of composite coating of HDA and micro-plasma oxidation on A3 steel

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2004年第Z1期14卷 310-314页

作者： YU sheng-xue XIA Yuan CHEN Ling GUAN Yong-jun YAO mei department of Environment Science and Chemical Engineering Yanshan University Qinhuangdao 066004 China Institute of Mechanics Chinese Academy of Science Beijing 100080 China Institute of Mechanics Chinese Academy of Science Beijing 100080 China Department of Environment Science and Chemical EngineeringYanshan University Qinhuangdao 066004 China Institute of Mechanics Chinese Academy of Science Beijing 100080 China College of Materials Science and EngineeringYanshan University Qinhuangdao 066004 China

Composite coatings were obtained on A3 steel by hot dipping aluminum(HDA) at 720 ℃ for 6 min and micro-plasma oxidation(MPO) in alkali electrolyte. The surface morphology, element distribution and interface structure of composite coatings were studied by means of XRD, SEM and EDS. The results show that the composite coatings obtained through HDA/MPO on A3 steel consist of four layers. From the surface to the substrate, the layer is loose Al2O3 ceramic, compact Al2O3 ceramic, Al and FeAl intermetallic compound layer in turn. The adhesions among all the layers are strengthened because the ceramic layer formed at the Al surface originally, FeAl intermetallic compound layer and substrate are combined in metallurgical form through mutual diffusion during HDA *** experiment results disclose that the anti-corrosion performance and wear resistance of composite coating are obviously improved through HDA/MPO treatment.

关键词： hot dipping aluminum micro-plasma oxidation composite coating ceramic coating

Disseminated Fusarium bloodstream infection in a child with acute myeloid leukemia:A case report

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2021年第21期9卷 6049-6055页

作者： Jun-Jie Ning Xue-mei Li sheng-Qiu Li department of PICU First People's Hospital of Zigong CityZigong 643000Sichuan ProvinceChina

BACKGROUND Disseminated Fusarium is rare in healthy *** with hematological tumors may have secondary fungal infections,including Fusarium infections,which are due to tumor bone marrow infiltration or prolonged bone marrow suppression after *** of the lack of typical clinical manifestations and effective antifungal drugs,early diagnosis and treatment of the disease are difficult,and the prognosis is *** SUMMARY The patient in this case was a 13-year-old female child with rash and fever as the first *** had the characteristics of the four stages of skin that are typical of Fusarium *** was diagnosed with disseminated Fusarium infection through skin biopsy and blood culture and diagnosed with Fusarium solani infection based on the morphological characteristics of the blood *** treatment with liposome amphotericin B combined with voriconazole,the child *** This case highlights that for children with secondary agranulocytosis after receiving chemotherapy for hematological malignancies,once typical abnormal skin damage is found,the possibility of Fusarium infection should be considered,and voriconazole alone or in combination with polyenes may be the most effective anti-Fusarium *** B,the traditional drug of disseminated Fusarium disease,has a high mortality rate,and it is not recommended to use it *** neutrophil counts are essential for the treatment of disseminated Fusarium bloodstream infection.

关键词： Fusarium Liposomal amphotericin B Voriconazole Acute myeloid leukemia Agranulocytosis Case report

Quasar SDSS J142507.32+323137.4: dual AGNs?

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2011年第4期11卷 411-418页

作者： Zhi-Xin Peng Yan-mei Chen Qiu-sheng Gu Chen Hu department of Astronomy Nanjing University Nanjing 210093 China Key Laboratory of Modem Astronomy and Astrophysics （Nanjing University） Ministry of Education Nanjing 210093 China Key Laboratory for Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China

We analyze the optical spectrum of type 1 QSO SDSS J1425＋3231. This object is interesting since its narrow emission lines, such as [O Ⅲ]λλ4959, 5007, are double-peaked, and the line structure can be modeled well by three Gaussian components： two components for the two peaks （we refer to the peaks at low/high redshift as ＂the blue/red component＂） and another one for the line wing which has the same line center as that of the blue component, but is- 3 times broader. The separation between the blue and red components is -500km s-1 with the blue component being -2 times broader than the red one. The Hβ emission can be separated into four components： two for the double-peaked narrow line and two for the broad line which comes from the broad line regions. The black hole mass estimated from the broad Hβ emission line using the typical reverberation mapping relation is 0.85 × 108 M⊙, which is consistent with that derived from parameters of [O Ⅲ]λ 5007 of the blue component. We suggest that this QSO might be a dual AGN system; the broad Hβ emission line is mainly contributed by the primary black hole （traced by the blue component） while the broad Hβ component of the secondary black hole （traced by the red component） is hard to be separated out considering a resolution of - 2 000 for SDSS spectra or it may be totally obscured by the dusty torus.

关键词： galaxie active -- galaxies individual (SDSS J142507.32+323137.4)-- quasars emission lines

Texture of Hot Rolled Strip for Fe-3Si Steel Produced by Thin Slab Casting and Rolling

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2010年第12期17卷 46-53页

作者： LI Chang-sheng YANG Hua WANG Yan-fang YU Yong-mei State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China Shougang Qian'an Iron and Steel Corporation Qian'an 064404 Hebei China

Fe-3Si steel strip was produced by thin slab casting and rolling （TSCR） process in the laboratory. The microstructure and texture of hot rolled strip by different total reduction and rolling schedules were observed through EBSD technique and X-ray diffraction method. The rule of texture density for the a,ε and γ fibers was analyzed. When the total reduction was increased from 82.9% to 97.1%, the gradient of microstrueture and texture for A steel surface layer and center layer was found, {001}〈110〉 texture had higher intensity, and {001}〈110〉texture was changed to { 110 } 〈 001 〉 and { 112 } 〈 111 〉. The texture distribution with different reduction schedules for B steel was basically similar, but the Goss texture orientation density and volume fraction for B steel were higher, the hot rolling reduction schedule of C1 was effective for the formation of Goss texture. The research work was useful theoretical basis and reference data to develop electrical steel by thin slab continuous casting and direct rolling technology.

关键词： silicon steel texture hot rolling thin slab continuous casting direct rolling