检索结果-南通市图书馆

Effect of Ni on the formation and thermal behavior of NdAlCo metallic glasses

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2011年第4期24卷 281-286页

作者： Yanxin zhuang jun CHEN Puwei WANG JichengHE Key Laboratory of Electromagnetic Processing of Materials (Ministry of EdUcation) NortheasternUniversity Shenyang 110819 China

Nd60All0Co30-xNix （x=0, 5, 10 and 15 at. pct） metallic glasses have been prepared using single-spinner and suck-casting method, and characterized using X-ray diffrac- tion （XRD） and non-isothermal differential scanning calorimetric technique. It has been found that the Mloy with 15 at. pct Ni has the strongest glass forming ability, and can be fabricated to a rod with 5 mm in diameter using suck-casting. The addition of Ni has an obvious effect on the thermal behavior of the metallic glasses, especially on the position of the second and third crystallization peaks. The crystallization ki- netics and activation energies of the four metallic glasses have been elaborated using the Kissinger equation. The continuous heating transformation curves of the T~ and Tpl have been constructed by applying the extension of the Vogel-Fulcher-Tammann （VFT） nonlinear equations, which are derived from the experimental data in the heat- ing rate range of 5-80 K/min. The effect of Ni on the formation and thermal stability of the Nd-based metallic glasses has been discussed.

关键词： Nd-based metallic glass Nickel Glass forming ability Thermalstability

A combined electrochemical and DFT study of the lattice strain effect on the surface reactivity of Pd

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2007年第10期18卷 1301-1304页

作者： You Gui Chen Lin zhuang jun Tao Lu Department of Chemistry Wuhan University Wuhan 430072 China

We report a combined study of electrochemical experiments and ab initio calculations on tuning the surface reactivity of Pd via a compressive lattice strain achieved by employing nanoparticles of Pd-Cu alloys with a Pd-rich surface. Surface oxygen-containing species were used as the probing molecule for revealing the surface reactivity. Both density functional theory （DFT） calculations and experiments showed linear relationships, with very close slopes, between the adsorption strength of OHads and the Pd lattice constant. Not only is this work a successful realization of controllable modulation in the surface reactivity, but it also provides valuable information for the rational design of Pd-based catalysts for fuel cell applications.

关键词： Palladium Lattice strain Reactivity Density functional theory Electrocatalysis

Wear-resistance and anti-scuffing of multi-arc ion plating molybdenum films

在线全文

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 391-394页

作者： WANG Hai-dou XU Bin-shi LIU Jia-jun zhuang Da-ming National Key Laboratory for Remanufacturing Academy of Armored Force Engineering Beijing 100072 China National Key Laboratory for Remanufacturing Academy of Armored Force Engineering Beijing 100072 China Department of Mechanical Engineering Tsinghua University Beijing 100084 China Department of Mechanical Engineering Tsinghua University Beijing 100084 China

The multi-arc ion plating technology was employed to prepare the molybdenum films with thickness of 3 μm on the AISI 1045 steel. The wear and scuffing tests were carried out on the ball-on-disc tester. AFM and SEM equipped with EDS were adopted to observe and analyze the morphologies and element compositions of surface,cross-section and worn scar of the Mo film. The phase structure was studied by XRD and the bonding strength between Mo film and substrate was measured by scratching tester. The tribological experiments show that the Mo film possesses a good wear-resistance and an excellent anti-scuffing property. The failure mechanism of Mo film under extreme condition is flaking off.

关键词： multi-arc ion plating molybdenum film wear and scuffing

Molecular Cloning and Characterization of Fruit Softening Related Gene β-Mannanase from Banana Fruit

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

Agricultural Sciences in China 2006年第4期5卷 277-283页

作者： zhuang jun-ping SU Jing CHEN Wei-xin Guangdong Province Key Laboratory for Postharvest Science and Technology College of Horticulture South China Agricultural University Guangzhou 510642 P.R.China College of Life Seience Sun Yat-Sen （Zhongshan） University Guangzhou 510275 P.R.China

A 1 250 bp cDNA fragment encoding β-mannanase, named MaMAN, was cloned from banana （Musa spp cv. Baxi） fruit using degenerate primers designed with reference to the conserved nucleic acid sequences of known β-mannanase genes by RT-PCR. Sequence analysis showed that MaMAN cDNA encompassed a 1 085 bp open-reading frame （ORF）, encoding a predicted polypeptide of 395 amino acids. Alignment of the deduced amino acid sequence of MaMAN and other putative β-mannanases showed that MaMAN has an identity of 86, 70, 69, 54, and 57%, respectively, to β-mannanases from tomato, lettuce, arabidopsis, carrot and oryza sativa. The catalytic residues： Asn203, Glu204, Glu318 and the active site residues： Arg86, His277, Tyr279, and Trp360, which were strictly conserved in the glycoside hydrolase family 5 to which all β-mannanases belonged, were found in MaMAN. Semi-quantitative RT-PCR revealed that the level of MaMAN transcript in the pulp increased during banana fruit ripening, suggesting that MaMAN was likely to be involved highly in banana fruit softening.

关键词： β-mannanase RT-PCR banana fruit ripening and softening

Experimental study of partially flattened axial grooved heat pipes

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2008年第19期53卷 3058-3072页

作者： TAO HanZhong ZHANG Hong zhuang jun Jerry W. BOWMANS Energy School of Nanjing University of Technology Nanjing 210009 China Mechanical Engineering Department Brigham Young University Provo Utah 84602 USA

This article made experimental study on mini-axial grooved heat pipes (AGHP) with 11 flattening forms. It analyzed how the flattening form, flattening thickness and working temperature affect axial temperature distribution, thermal resistance, heat transfer limit and the phase-change heat transfer coefficients in evaporator and condenser sections. The result indicates that all forms of AGHPs can maintain good isothermal performance under normal operating condition. The geometric shape of AGHP has obvious impact on heat transfer limit. With respect to an AGHP with 2 mm-thick evaporator section, when the thickness of its condenser section increases from 2 to 3 mm, its heat transfer limit increases by 81%; with respect to an AGHP with 3 mm-thick evaporator section, when the thickness of its con- denser section increases from 2 to 3 mm, its heat transfer limit increases by 134%; with respect to an AGHP with 4 mm-thick condenser section, when the thickness of its evaporator section increases from 2 to 3 mm, its heat transfer limit increases by 26%. When the thickness of the evaporator section in- creases by 1 mm, the heat transfer limit will increase by 9%―26%, while when the thickness of the condenser section increases by 1 mm, the heat transfer limit will increase by 20%―86%. The thickness of the condenser section has greater impact on heat transfer performance of an AGHP than the thickness of the evaporator section does. The study content of this article will help understand the heat transfer performance of AGHP, and electronic thermal design process.

关键词：热管实验研究扁率蒸发器

Synthesis and Crystal Structure of Rctt-1-(2-benzoxazolyl)-2-(4-chlorophenyl)-4-phenyl-3-(4-pyridinyl)cyclobutane

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2003年第1期22卷 65-69页

作者： zhuang jun-Peng ZHANG Wen-Qin② (Department of Chemistry, Tianjin University, Tianjin 300072, China) Tianjin Univ Dept Chem Tianjin 300072 Peoples R China

The title compound (C28H21ClN2O, Mr = 436.92) was synthesized by the cross- photodimerization of (E)-2-(2-phenylethenyl)benzoxazole and (E)-4-[2-(4-chlorophenyl)ethenyl]- pyridine in sulfuric acid solution. Its molecular structure has been unequivocally determined by X-ray crystallography. The title compound belongs to triclinic system, space group P?with cell parameters: a = 9.648(3), b = 10.458(4), c = 12.106(4) , a = 89.089(7), b = 75.644(6), g = 68.441(7)? V = 1096.7(7) 3, Z = 2, Dc = 1.323 g/cm3, F(000) = 456 and m(MoKa) = 0.198 mm-1. The final R and wR are 0.0627 and 0.1285, respectively for 1737 observed reflections with I > 2s(I). S = 0.921 and (/s)max = 0.001. The cyclobutane ring has a puckered conformation with four different aryl groups substituted on each carbon atom. The dihedral angles of the cyclobutane ring are 20.2 and 20.6? The bond distances of the cyclobutane ring are 1.541, 1.555, 1.560 and 1.563 ? respectively, which are slightly longer than that of the normal CC single bond. The title compound is the only cross-dimer and its two heteroaryl groups are situated at the trans-1,3 position of the cyclobutane ring, revealing that the cross-photodimerization proceeds in a head-to-tail pattern with high stereo-selectivity.

关键词： cyclobutane photodimerization crystal structure

Challenges and progresses of energy storage technology and its application in power systems

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Power Systems and Clean Energy 2016年第4期4卷 519-528页

作者： Liangzhong YAO Bo YANG Hongfen CUI jun zhuang Jilei YE Jinhua XUE China Electric Power Research Institute Nanjing 210003JiangsuChina

As a flexible power source,energy storage has many potential applications in renewable energy generation grid integration,power transmission and distribution,distributed generation,micro grid and ancillary services such as frequency regulation,*** this paper,the latest energy storage technology profile is analyzed and summarized,in terms of technology maturity,efficiency,scale,lifespan,cost and applications,taking into consideration their impact on the whole power system,including generation,transmission,distribution and *** application scenarios of energy storage technologies are reviewed and investigated,and global and Chinese potential markets for energy storage applications are *** challenges of large-scale energy storage application in power systems are presented from the aspect of technical and economic *** the development prospect of global energy storage market is forecasted,and application prospect of energy storage is analyzed.

关键词： Renewable energy Energy storage technology Energy storage application Power system

Fragmentation Mechanism of Fullerenes in the Positive and Negative Ion Channels

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

Chinese Physics Letters 2001年第8期18卷 1056-1059页

作者： KONG Qing-Yu ZHAO Li zhuang jun QIAN Shi-Xiong LI Yu-Fen State Key Joint Laboratory for Materials Modification by Laser Ion and Electron Beamsand Department of PhysicsFudan UniversityShanghai 200433

The authors have performed the photofragmentation studies of pristine C_(60) and C_(60)/C_(70) composites on the reflectron time-of-flight mass spectrometer(RTOF MS)in the positive and negative ion *** mechanism of the formation of daughter fullerenes in the negative ion channel and the enhancement of fullerene coalescence reactions have been discussed compared to our previous studies on the linear *** 5 cm free expansion path in the RTOF experiments provides sufficient time and favorable environment for the electrons to attach to the neutral daughter species,so it is thought to play a key role for the appearance of strong mass peaks of anionic fragmentation and aggregation fullerene *** appearance of odd-numbered“fullerene”fragments is briefly discussed.

关键词： fragmentation (MS) neutral

Cleavage of the Babuvirus Movement Protein B4 into Functional Peptides Capable of Host Factor Conjugation is Required for Virulence

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

Virologica Sinica 2019年第3期34卷 295-305页

作者： jun zhuang Wenwu Lin Christopher J.Coates Pengxiang Shang Taiyun Wei Zujian Wu Lianhui Xie State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops Fujian Agriculture and Forestry UniversityFuzhou 350002China Institute of Plant Virology Fujian Agriculture and Forestry UniversityFuzhou 350002China Department of Biosciences College of ScienceSwansea UniversitySwansea SA2 8PPWalesUK

Banana bunchy top virus(BBTV)poses a serious danger to banana crops ***-encoded protein B4 is a determinant of ***,the relevant molecular mechanisms underlying its effects remain *** this study,we found that a functional peptide could be liberated from protein B4,likely via proteolytic ***-directed mutagenesis indicated that the functional processing of protein B4 is required for its pathogenic effects,including dwarfism and sterility,in *** released protein fragment targets host proteins,such as the large subunit of RuBisCO(RbcL)and elongation factor 2(EF2),involved in protein ***,the peptide released from B4(also a precursor)may act as a non-canonical modifier to influence host-pathogen interactions involving BBTV and plants.

关键词： Banana bunchy top virus(BBTV) Movement protein B4 Functional peptide Pathogenicity