检索结果-南通市图书馆

Healing Behavior of Micropores in Powder Metallurgy 316L Stainless Steel during Hot Forging and Heat Treatment

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2014年第9期21卷 862-868页

作者： Ying KAN Shi-hong zhang Li-wen zhang ming CHENG hong-wu SONG hong-wei LU School of Materials Science and Engineering Dalian University of Technology Institute of Metal Research Chinese Academy of Sciences Forge Plant Angang Heavy Machine Co.Ltd.

The healing behavior of micropores in powder metallurgy （P/M） 316L stainless steel during hot forging and subsequent heat treatment was studied. The results showed that hot forging can improve the homogeneity of the pore size and enhance the relative density of material in varying degree due to different forging temperatures. As a re- sult of deformation and diffusion bonding at high temperature, the irregular pores were spheroidized and finally turned into stable inner grain pores. The comparison of compression behavior between P/M and wrought dense mate rials has shown that the pores can either be the obstacles of dislocation movement or be the nucleation sites accelera- ting the reerystallization according to the difference of deformation temperatures.

关键词： powder metallurgy 316L stainless steel microstructural evolution densification behavior micropore

Longitudinal corner crack of chamfered slab and optimization of mould

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2023年第2期30卷 259-266页

作者： hong-biao Tao Hui zhang He-ping Liu ming-lin Wang National Engineering&Research Center of Continuous Casting Technology CISRIBeijing100081China

Chamfered mould has gradually become a new technology equipment to eliminate transverse corner ***,longitudinal corner crack ratio of chamfered slab was very *** microstructure was detected in the area where the longitudinal corner crack *** of narrow face shape and taper distribution of mould copper plate on longitudinal corner crack was studied by industrial *** velocity distribution in the narrow copper plate was studied by numerical *** the premise of preventing cooling water from nuclear boiling,improvement measures of mould cooling process and water seam structure were put forward through heat transfer *** results showed that local taper of the meniscus region of mould should be increased to prevent generation of longitudinal corner *** slope length of narrow copper plate should be controlled within 55 mm,and chamfering angle should be controlled at about 30°.Average water velocity should be more than 7.0 m/*** flat and chamfering regions of narrow copper plate working face should be designed as double taper and funnel structure,*** water seam in the chamfering region should preferentially choose the combined cooling structure with two holes and one *** order to prevent the extension of longitudinal corner crack,chamfered narrow face foot roller should be used.

关键词： Chamfered mould Longitudinal corner crack Copper plate shape Mould water velocity Mould taper

Design of dual-functional protic porous ionic liquids for boosting selective extractive desulfurization

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

Petroleum Science 2024年第4期21卷 2817-2829页

作者： Jin-Rui zhang Jie Yin Jing He hong-Shun Ran Wei Jiang hong-Ping Li Wen-Shuai Zhu Hua-ming Li ming zhang School of the Environment and Safety Engineering&Institute for Energy Research Jiangsu UniversityZhenjiang212013JiangsuChina School of Chemistry and Chemical Engineering Jiangsu UniversityZhenjiang212013JiangsuChina

Porous ionic liquids have demonstrated excellent performance in the field of separation,attributed to their high specific surface area and efficient mass ***,task-specific protic porous ionic liquids(PPILs)were prepared by employing a novel one-step coupling neutralization reaction strategy for extractive *** single-extraction efficiency of PPILs reached 75.0%for ***,adding aromatic hydrocarbon interferents resulted in a slight decrease in the extraction efficiency of PPILs(from 45.2%to 37.3%,37.9%,and 33.5%),indicating the excellent extraction selectivity of *** experimental measurements and density functional theory calculations reveal that the surface channels of porous structures can selectively capture dibenzothiophene by the stronger electrophilicity(Eint(HS surface channel/DBT)=-39.8 kcal mol^(-1)),and the multiple extraction sites of ion pairs can effectively enrich and transport dibenzothiophene from the oil phase into PPILs throughπ...π,C-H...πand hydrogen bonds ***,this straightforward synthetic strategy can be employed in preparing porous liquids,offering new possibilities for synthesizing PPILs with tailored functionalities.

关键词： Protic porous ionic liquids Extractive desulfurization Selectivity Density functional theory

Characteristic analysis of a Smith–Purcell terahertz source

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2016年第5期4卷 162-167页

作者： Xian-Zhu Meng ming-hong Wang Li-ming zhang Zhong-Min Ren Shandong Provincial Key Laboratory of Optical Communication Science and Technology School of Physics Science and Information Engineering Liaocheng University

We investigate a novel Smith–Purcell terahertz source. This device is composed of an electron gun, a cylindrical resonator, a metallic grating, and a collector. The characteristics of the Smith–Purcell terahertz source are discussed with the help of three-dimensional particle-in-cell simulation. In this device, coherent and high-power Smith–Purcell radiation(SPR) at the terahertz frequency range can be produced for the reasonable parameters of charge energy and grating. Our results indicate that coherent SPR at 506.529 GHz with a power around 1000 W can be obtained for a grating of period l=0.3 mm operating at the beam energy E=50 keV and beam current I=10 A.

关键词： cell THz Purcell terahertz source Characteristic analysis of a Smith

Self-polymerization and co-polymerization kinetics of lead methacrylate

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2021年第3期40卷 736-742页

作者： Yu-Juan zhang Xin-Tao Guo Chun-hong Wang De-Feng Wu ming zhang School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002China Department of Materials Research AVIC Manufacturing Technology InstituteBeijing 100024China

Hydrogen nuclear magnetic resonance(H1-NMR) and X-ray diffractometer(XRD) were used to characterize the molecular and crystal structure of lead methacrylate [Pb(MAA)_(2)] which was produced by the double decomposition reaction of lead oxide and methacrylic *** analysis and Kelen-T(u|")dos(K-T) method were used to study the self-polymerization kinetic and the monomer reactivity ratios of Pb(M A A)_(2) and methyl methacrylate(MMA),*** the ternary polymerization method of bulk casting using MMA,Pb(MAA)_(2) and gadolinium methacrylate(Gd(MAA)_(3)) as monomers,we prepared the plexiglass which have neutron and X-ray protection *** results show that the polymerization rate(R_(p)) is expressed as Rp=K[M]^(1.02)[I]^(0.37) below the 10% conversion rate at 70℃,where K is the polymerization rate *** in the N,N-dimethylformamide(DMF) solution,the activation energy required for Pb(MAA)_(2) to initiate self-polymerization by the free radicals is 74.99 kJ·mol^(-1).The reactivity ratios of r1 [Pb(MAA)_(2)] and r2(MMA) are 3.767 *** the thickness of the material increases,the X-ray and thermal neutron shielding ability of the plexiglass containing gadolinium and lead is getting better and better.

关键词： Lead methacrylate Polymerization kinetic Reactivity ratio Plexiglass

Teleportation of Three-Level Multi-partite Entangled State by a Partial Three-Level Bipartite Entangled State

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2008年第4期49卷 891-894页

作者： DAI hong-Yi zhang ming LI Cheng-Zu College of Science National University of Defense Technology Changsha 410073 China College of Mechatronics Engineering and Automatization National University of Defense Technology Changsha 410073 China Department of Physics Hunan Normal University Changsha 410081 China

We present a scheme for probabilistically teleporting an unknown three-level bipartite entangled state by using a partial entangled three-level bipartite state as quantum channel This scheme can be directly generalized to probabilistically teleport an unknown three-level k-particle entangled state by a partial three-level bipartite entangled state. A11 kinds of unitary transformations are given in detail We calculate the successful total probability and the total classical communication cost required for this scheme.

关键词： teleportation three-level multi-partite entangled state classical communication cost

在线全文

学校读者我要写书评

暂无评论

双激振式动压机的自同步分析

西安石油大学学报（自然科学版） 2004年第6期19卷 66-68页

作者：杨献平吴志星刘洪斌张明洪西南石油学院研究生院四川成都610500

研究激振电机的特性 ,特别是两台质径积相等的激振电机在动压机上实现自同步运转的动态特性 ,将有助于实现其最佳性能并推广应用于更广泛的领域 .通过动力学分析建立了新型钻井液动压分离机力学模型。

关键词：激振自同步压机液动运转条件动态特性动力学分析新型分离机性能

Expression and functional analysis of Fa PHO1;H9 gene of strawberry(Fragaria×ananassa)

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2017年第3期16卷 580-590页

作者： CAO Fei LI He WANG Shou-ming LI Xiao-ming DAI hong-yan zhang Zhi-hong College of Horticulture Shenyang Agricultural University Shenyang 110866 P.R. China

Although the phosphate 1（PHO1）gene family has been implicated in inorganic phosphate transport and homeostasis,the underlying mechanism of this gene in the strawberry has not yet been *** the present study,we analyzed the expression of the PHO1;H9 gene in the strawberry（Fragaria×ananassa）,revealing the involvement of this gene in the regulation of phosphorus（P）*** coding sequence（CDS）of the PHO1;H9 gene,was isolated from the cultivated strawberry‘Sachinoka’and named as Fa PHO1;*** full-length CDS of this gene was 2 292 bp,encoding 763 amino acids,and the protein contained both SYG1/Pho81/XPR1（SPX）and ERD1/XPR1/SYG1（EXS）domains,which were involved in phosphate（Pi）***-time reverse transcription-polymerase chain reaction（RT-PCR）data suggested that the level of Fa PHO1;H9 expression was consistent with the P content in different organs,except for the ***,its expression level was also correlated with P content in fruits of different developmental *** expression of Fa PHO1;H9 was also consistent with P content in leaves under different concentrations of P fertilizer ***,transgenic Arabidopsis lines were generated,and the P content in Arabidopsis plants over-expressing Fa PHO1;H9was significantly higher than that in wild-type ***,we proposed that Fa PHO1;H9 functions in P transport.

关键词： Fragariaxananassa PHO1 H9 phosphorus expression fruits transgenic Arabidopsis

Classical Communication Cost and Remote Preparation of Multi-qubit with Three-Party

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2008年第7期50卷 73-76页

作者： DAI hong-Yi zhang ming KUANG Le-Man College of Science National University of Defense Technology Changsha 410073 China College of Mechatronics Engineering and Automatization National University of Defense Technology Changsha 410073 China Department of Physics Hunan Normal University Changsha 410081 China

We present a scheme for probabilistic remote preparation of multi-qubit with three-party from a sender to either of two receivers. The quantum channel is composed of a partial entangled tripartite GHZ state. We obtain the successful totM probability of the scheme in the general case and special case, respectively. We also calculate total classical communication cost required in the RSP process with three-party in the general case and special case, respectively.

关键词： remote state preparation multi-qubit classical communication cost three-party