检索结果-南通市图书馆

Chemical Research in Chinese Universities 2001年第1期17卷 63-68页

作者： GAO Jin sheng ma Zhong guo YE Ling BU Wei ming ma dong sheng YU Chang hua GE Yue FAN Yu guo Department of Chemistry Heilongjiang UniversityHarbin 150080P.R.China Key Laboratory of Supramolecular Structure and Spectroscopy Jilin UniversityChangchun 130023P.R.China

The novel complexes, Cp(CO) 2FeTiCp 2Cl(1) and Cp(CO) 2FeSn(CH 2CMe 2Ph) 3(2), were synthesized and characterized by means of elemental analyses and IR spectra, Cp(CO) 2FeSn· (CH 2CMe 2Ph) 3 was additionally characterized by X ray crystal structure analysis. The results of the elemental analyses are in good agreement with the theoretical values. The IR spectra show the existence of η 5 2,4 cyclopentadien 1 yl, carbonyl and methyl groups in the title complexes. The above experimental results show that the M-M bond exists in Cp(CO) 2FeSn· (CH 2Me 2Ph) 3, while the existence of the M-M bond in Cp(CO) 2FeTiCp 2Cl is highly possible, too. Both the two complexes are rather stable towards air and moisture, easily soluble in tetrahydrofuran and toluene, while their solubilities are greatly different in n hexane.

关键词： Metal metal bond Heteronuclear bimetallic complex Synthesis Characterization Crystal structure

Synthesis, Crystal Structure and Properties of Complex VO(C10H9NO3)(C13H10NO2)

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2005年第1期21卷 104-108页

作者： ma dong-sheng, GAO Shan **, HUO Li-hua, GAO Jin-sheng and ZHAO Jin-gui College of Chemistry and Chemical Engineering, Heilongjiang University, Harbin 150080, P. R. China College of Chemistry and Chemical Engineering Heilongjiang University Harbin 150080

Complex VO(C 10H 9NO 3)(C 13H 10NO 2)(C 10H 9NO 2- 3=N-salicylidene-L-alaninate, C 13H 10NO- 2=N-phenylbenzohydroxamate) was synthesized and characterized by means of elemental analysis, IR, UV, 1H NMR spectroscopies, cyclic voltammetry and single crystal X-ray diffraction. The complex crystallized in a monoclinic system with space group P2 1 and crystal cell parameters a=0.9720(1) nm, b=1.8274(2) nm, c=1.2542(1) nm, β=104.868(9)°, V=2.1532(4) nm3, M r=470.34, Z=2. The two oxygen atoms and the one nitrogen atom of the tridentate Schiff base ligand and the one oxime oxygen atom of the hydroxamate ligand coordinate to the vanadium atom, forming an equatorial plane, the two axial positions are respectively occupied by the oxygen atom of the oxovanadium and the carbonyl oxygen atom of the hydroxamate and the vanadium atom exhibits a distorted octahedral VO(ONO)(OO) coordination sphere. The 1H NMR spectrum suggests that the two isomers, endo and exo in a molar ratio of 1/1.7, coexist in the solution of the title complex in CDCl 3. There exists a quasi-reversible one-electron redox reaction corresponding to VⅤ/VⅥ couple in the three non-aqueous solvents, and the redox potential E 1/2 of the title complex substantially shifts in the direction of the positive voltage increase in the order: CH 2Cl 2

关键词： Oxovanadium complex Hydroxamate complex Crystal structure Spectral property

Synthesis,Crystal Structure and Properties of Complex VO(C12H12N2O2)(C13H10NO2)

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2004年第3期20卷 341-344页

作者： ma dong\|sheng,Gao Shan\+\{**\},HUO Li\|hua and GAO Jing\|sheng College of Chemistry and Chemical Engineering,Heilongjiang University,Harbin 150080,P. R. China College of Chemistry and Chemical Engineering Heilongjiang University Harbin 150080

Complex VO(C\-\{12\}H\-\{12\}N\-2O\-2)(C\-\{13\}H\-\{10\}NO\-2)(C\-\{12\}H\-\{12\}N\-2O\+\{\{\}\+\{2-\}\}\-2=acetylacetone benzoylhydrozanate,C\-\{13\}H\-\{10\}NO\+_\-2=\%N\%\|phenylbenzohydroxamate) was synthesized and characterized by means of elemental analysis,IR and UV spectroscopies,cyclic voltammetry and single crystal X\|ray diffraction. The complex crystallized in the monoclinic system with space group \%P\%2\-1/\%n\% and the crystal cell parameters \%a\%=1\^3003(1) nm,\%b\%=0\^88836(6) nm,\%c\%=2\^0196(2) nm,\%β\%=95\^065(8)°,\%V\%=2\^3238(3) nm\+3,\%M\%\-r=495\^40 and \%Z\%=4. The two oxygen and one nitrogen atoms of the tridentate hydrazone ligand coordinate to the vanadium atom,forming an equatorial plane. And the coordinated vanadium atom exhibits a distorted octahedral geometry. The atom in the transposition to the oxo O atom is the carbonyl oxygen atom of the hydroxamate ligand in the complex. The half\|wave redox potential of the title complex in the three different solvents positively shifts in the order of CH\-2Cl\-2

关键词： Oxovanadium(Ⅴ) hydrazone complex Hydroxamate complex Crystal structure Spectral property

Mechanisms of Excitation Transferin Bilayer Vesicles Containing Schiff Base MoietyAdsorbed Dye Anions

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 1994年第3期10卷 256-258页

作者： ma dong-sheng(Department of Chemistry , Heilongjiang University, Harbin, 150080) WU Li-xin (Institute of Theoretical Chemistry,Jilin Uuiversity, Changchun ,130023)

ＭｅｃｈａｎｉｓｍｓｏｆＥｘｃｉｔａｔｉｏｎＴｒａｎｓｆｅｒｉｎＢｉｌａｙｅｒＶｅｓｉｃｌｅｓＣｏｎｔａｉｎｉｎｇＳｃｈｉｆｆＢａｓｅＭｏｉｅｔｙＡｄｓｏｒｂｅｄＤｙｅＡｎｉｏｎｓＭＡＤｏｎｇ－ｓｈｅｎｇ（Ｄｅｐａｒ... 详细信息

ＭｅｃｈａｎｉｓｍｓｏｆＥｘｃｉｔａｔｉｏｎＴｒａｎｓｆｅｒｉｎＢｉｌａｙｅｒＶｅｓｉｃｌｅｓＣｏｎｔａｉｎｉｎｇＳｃｈｉｆｆＢａｓｅＭｏｉｅｔｙＡｄｓｏｒｂｅｄＤｙｅＡｎｉｏｎｓＭＡＤｏｎｇ－ｓｈｅｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉｓｔｒｙ，...

关键词： Energy transfer Mechanism Bilayer Vesicles

Positive effect of Mo on mechanical properties of a Ni-42W-10Co-xMo medium heavy alloy

在线全文

学校读者我要写书评

暂无评论

China Foundry 2025年第1期22卷 108-116页

作者： Guo-xin Cao Jian-xin dong Yong-sheng He He Jiang Fang Hao Zhi-hua Nie Teng-fei ma Bao-quan Fu School of materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Xi'an Superalloy Technology Co. Ltd.Xi’an 710299China School of materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Key Laboratory of Air-driven Equipment Technology of Zhejiang Province Quzhou UniversityQuzhou 324000ZhejiangChina

In this study,a novel Ni-W-Co-Mo medium heavy alloy(MHA)was designed to improve its mechanical strength via Mo *** the Ni-42W-10Co-x Mo alloy series,where x represents the weight percent of Mo and varies between 0,1,2,5,and 10,the microstructure transitions from a dendritic structure to a hypo-eutectic structure as the Mo content increases from 0 to 5wt.%.Moreover,as the Mo content increases from 0 to 10wt.%,the distribution of theμ-phase shifts from being individually dispersed to forming aggregates,and its volume fraction rises from 0.5%to 7.9%.Notably,theμ-phase evolves into an eutectic microstructure,which helps in minimizing the segregation of *** change is accompanied by a substantial enhancement in mechanical properties;specifically,the compressive yield strength at room temperature increases from 350 MPa to 646 MPa,indicating a significant 85%***,the microhardness increases from 230 HV to 304 *** dynamics simulations further reveal that the strengthening mechanism of Ni-42W-10Co-x Mo alloys is Mo-induced solid solution strengthening and precipitation strengthening.

关键词： medium-heavy alloys Ni-based alloy mechanical properties solid solution strengthening precipitation strengthening

同方期刊数据库

Modeling Bivariate Distribution of Wind Speed and Wind Shear for Height-Dependent Offshore Wind Energy Assessment

在线全文

学校读者我要写书评

暂无评论

Journal of Ocean University of China 2025年第1期24卷 40-62页

作者： YANG Zihao dong sheng College of Engineering Ocean University of ChinaQingdao 266404China

A joint statistical model of wind speed and wind shear is critical for height-dependent wind resource characteristic ***,given the different atmospheric conditions that may be involved,the statistical distribution of the two variables may show multimodal *** this work,a finite mixture bivariate statistical model was designed to describe the statistical properties,which is composed of several components,each with a Weibull distribution and a normal distribution for wind speed and wind shear,respectively,with a Gaussian copula to describe the dependency structure between the two *** confirm the developed model,reanalysis data from six positions in the coastal sea areas of China were *** results disclosed that the developed joint statistical model can accurately capture the different multimodal structures presented in all the bivariate samples under mixed atmospheric conditions,giving acceptable predictions of the joint probability *** consideration of wind shear coefficient variation is crucial in estimating height-dependent wind resource ***,unlike traditional methods that are limited to specific hub heights,the model developed here can estimate wind energy potential across different hub heights,enhancing the economic viability assessment of wind power projects.

关键词： wind shear coefficient wind speed mixed atmospheric conditions mixture bivariate statistical model height-dependent wind resource characteristics

Small extracellular vesicles derived from human induced pluripotent stem cell-differentiated neural progenitor cells mitigate retinal ganglion cell degeneration in a mouse model of optic nerve injury

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第2期20卷 587-597页

作者： Tong Li Hui-Min Xing Hai-dong Qian Qiao Gao sheng-Lan Xu Hua ma Zai-Long Chi State Key Laboratory of Ophthalmology Optometry and Visual ScienceEye HospitalWenzhou Medical UniversityWenzhouZhejiang ProvinceChina National Clinical Research Center for Ocular Diseases Eye HospitalWenzhou Medical UniversityWenzhouZhejiang ProvinceChina

Several studies have found that transplantation of neural progenitor cells(NPCs)promotes the survival of injured ***,a poor integration rate and high risk of tumorigenicity after cell transplantation limits their clinical *** extracellular vesicles(sEVs)contain bioactive molecules for neuronal protection and *** studies have shown that stem/progenitor cell-derived sEVs can promote neuronal survival and recovery of neurological function in neurodegenerative eye diseases and other eye *** this study,we intravitreally transplanted sEVs derived from human induced pluripotent stem cells(hiPSCs)and hiPSCs-differentiated NPCs(hiPSC-NPC)in a mouse model of optic nerve *** results show that these intravitreally injected sEVs were ingested by retinal cells,especially those localized in the ganglion cell *** with hiPSC-NPC-derived sEVs mitigated optic nerve crush-induced retinal ganglion cell degeneration,and regulated the retinal microenvironment by inhibiting excessive activation of *** analysis further revealed that hiPSC-NPC derived sEVs transported neuroprotective and anti-inflammatory miRNA cargos to target cells,which had protective effects on RGCs after optic nerve *** findings suggest that sEVs derived from hiPSC-NPC are a promising cell-free therapeutic strategy for optic neuropathy.

关键词： exosome miRNA neural progenitor cell neurodegeneration neuroinflammation neuroprotection optic nerve crush optic neuropathy retinal ganglion cell small extracellular vesicles

在线全文

学校读者我要写书评

暂无评论

钨的地球化学研究进展

高校地质学报 2009年第1期15卷 19-34页

作者：马东升内生金属矿床成矿机制研究国家重点实验室(南京大学) 南京大学地球科学与工程学院南京210093

钨矿是我国的优势矿产资源,储量、产量、消费量和出口量均居世界首位,尤其自本世纪以来,我国钨的年产量稳居全球80%以上。钨在现代工业和生活中有广泛的应用,是一种重要的战略资源。对近20年来,钨的地球化学研究进展进行了概括性综述,... 详细信息

钨矿是我国的优势矿产资源,储量、产量、消费量和出口量均居世界首位,尤其自本世纪以来,我国钨的年产量稳居全球80%以上。钨在现代工业和生活中有广泛的应用,是一种重要的战略资源。对近20年来,钨的地球化学研究进展进行了概括性综述,包括钨在太阳系、行星地球及其各种主要内生、表生产物中的分布,钨在岩浆-热液过程和表生作用中的地球化学行为,以及钨的生物效应和环境影响等。值得指出的是,近十年来,最值得关注的是有关钨的生物效应和环境影响方面的研究进展。我国作为世界产钨大国,对钨在生物地球化学和环境化学及其健康影响方面的研究几乎还是空白,亟需尽快开展这方面的数据积累和研究。

关键词：钨地球化学内生作用表生作用生物效应环境影响

华南重要金属矿床的成矿规律——时代爆发性、空间分带性、基底继承性和热隆起成矿

在线全文

学校读者我要写书评

暂无评论

矿物岩石地球化学通报 2008年第3期27卷 209-217页

作者：马东升南京大学地球科学与工程学院内生金属矿床成矿机制研究国家重点实验室南京210093

华南热液矿床形成的时代爆发性、空间分带性及其成矿元素对前寒武纪基底的继承性表明,构成华南基底和含矿建造的前寒武纪地层(主要为元古界)是华南陆内热液成矿作用的主要成矿物质来源,燕山期花岗岩类是热液成矿作用的主要成矿能量来源... 详细信息

华南热液矿床形成的时代爆发性、空间分带性及其成矿元素对前寒武纪基底的继承性表明,构成华南基底和含矿建造的前寒武纪地层(主要为元古界)是华南陆内热液成矿作用的主要成矿物质来源,燕山期花岗岩类是热液成矿作用的主要成矿能量来源;华南热液成矿的区域分布趋势、矿床形成过程和成矿岩体演化等,均表现出与构造热隆起动态有关的成矿特征。多期花岗岩类侵入和迅速块断隆升造成地温梯度增高,基底含矿建造提供成矿物质,以及有利的热液通道和扩容空间是造成构造隆起带或盆地"凹中隆"成矿的重要条件。燕山期花岗岩成岩成矿与大陆地壳的多旋回熔融或再循环有密切的成因关系;地震层析图像资料显示,华南中生代软流圈上涌是造成华南陆壳热隆起的动力学因素。但其成因不同于地幔柱机制,具有被动上涌特征,可能与太平洋板块俯冲形成的大型冷幔柱下沉和地幔过渡带崩溃有关。

关键词：金属矿床花岗岩矿床成因热隆起华南

Fracture behavior of sandstone with partial filling flaw under mixed-mode loading: Three-point bending tests and discrete element method

在线全文

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2025年第1期17卷 291-308页

作者： dongdong ma Yu Wu Xiao ma Xunjian Hu Wenbao dong Decheng Li Lingyu Li State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and TechnologyXuzhou221116China State Key Laboratory of Structural Health and Safety of Bridges Wuhan430034China Research Center of Coastal and Urban Geotechnical Engineering Zhejiang UniversityHangzhou310058China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China

The fracture behavior of natural fracture in the geological reservoir subjected to filling property,affects the crack initiation and propagation under stress *** filling flaws were intermediate between open fractures and filled fractures,the fracture response may be worth *** this work,the effect of the filling property of sandstone with partial filling flaws on the fracture behavior was systematically investigated based on three-point bending tests and the numerical approach of discrete element method(DEM).In the laboratory,semi-circular three-point bending tests were carried out with partial filling flaws of various filling *** on this,numerical simulations were used to further investigate the effect of the filling ratio and the inclination of the partial filling flaw on the mechanical and fracture responses,and the effect of the partial filling flaw under mixed-mode loading on the fracture mechanism was elucidated coupled with acoustic emission(AE)*** obtained results showed that the increase in filling strength and filling ratio of partial filling flaw led to an increase in peak strength,with a decreasing trend in peak strength with the inclination of partial filling *** terms of crack propagation pattern,the increasing filling strength of the partial filling flaw induced the transformation of the fracture mechanism toward deflection,with a tortuosity path,while the filling ratio and inclination of partial filling flaw led to fracture mechanism change from deflection to penetration and attraction,accompanied with a larger AE event source in ***,the b-value based on the Gutenberg-Richter equation fluctuated between 5 and 4 at low filling ratio and inclination and remained around 5 at high filling ratio and inclination of partial filling *** results may provide an application prospective for reservoir stimulation using the natural fracture system.

关键词： Partial filling flaw Mixed-mode loading Semi-circular three-point bending Acoustic emission(AE) b-value