检索结果-南通市图书馆

Quasi-Classical Trajectory Calculations of Reaction Stereodynamics of H+OH(v=0,j=0)→H2+O(^(3) P)

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 2011年第8期28卷 68-71页

作者： ZHAO Li SUN Ping LIU chao-zhuo School of Science China University of Petroleum(East China)Dongying 257061 School of environmental science Dalian Jiaotong UniversityDalian 116028

In order to study the vector properties,especially the correlation between the reagents and the products,of the title reaction,the quasi-classical trajectory calculations on the ^(3)A'and ^(3)A"potential energy surfaces(PESs)have been *** results indicate that the product rotational angular momentum j'is aligned and oriented perpendicular to the scattering plane on both *** rotational polarization behaviors of the product H2 with different collision energies are shown for the two *** alignment effect tends to become weaker with the increasing collision *** product H2 mainly tends to the backward scattering on the two PESs at low collision ***,there exists a switch from backward scattering to the sideways one on the ^(3)A"PES with increasing collision *** differences are reasonably explained with the characteristics of the two PESs.

关键词： energy collision backward

Thermodynamic model for precipitation of carbonitrides in microalloyed steels and its application in Ti-V-C-N system

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

Rare Metals 2016年第10期35卷 735-741页

作者： Yan-Lin Wang Long-chao zhuo Ming-Wen Chen Zi-Dong Wang School of Materials Science and Engineering Tsinghua University School of Materials Science and Engineering University of Science and Technology Beijing School of Materials Science and Engineering Xi'an University of Technology School of Mathematical and Physical Sciences University of Science and Technology Beijing

Based on mass balance and solubility product equations, a thermodynamic model enabling the calcula- tion of equilibrium carbonitride composition and relative amounts as a function of steel composition and tem- perature was developed, which provides a method to es- timate the carbonitride complete dissolution temperature for different steel compositions. Actual carbonitride pre- cipitation behavior was further verified in Ti-V-C-N microalloyed steel system. The model suggests that for higher IV] and [Ti] dissolved in steels, it is available to decrease the addition of C and N during alloy composi- tion design. The resultant longer fatigue life of the modified steel could be attributed to the more [V] and [Ti] dissolved in the matrix, inducing finer dispersion of carbonitrides. Therefore, this model is proved to be effective in determining better chemical composition for high-performance steels, leading to possible reductions in the cost of production and improvements in the combined mechanical properties of the steels.

关键词： Microalloyed Carbonitrides Thermodynamic model Dissolution

Synthesis, Crystal Structure and Gas Adsorption of a Trimeric Nickel-based Coordination Polymer

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2019年第3期38卷 345-350页

作者： WANG Min zhuo chao HE Liang LIN Qi-Pu State Key Laboratory of Structural chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences College of Chemistry and Materials Science Fujian Normal University

A trimeric porous coordination framework [Ni_3(TPTC)(IN)_2(μ_2-H_2O)_2(CH_3OH)_2)]n· x(solvents)(1, TPTC = terphenyl-3,3?,5,5??-tetracarboxylic acid, IN = isonicotinic acid) was synthesized and characterized by elemental analysis, infrared spectroscopy, thermogravimetric analysis, single-crystal and powder X-ray diffraction. It crystallizes in monoclinic space group C2/c with a = 33739(12), b = 14.820(5), c = 13.568(5) ?, β = 97.388(6)o, V = 6728(4) ?3, Z = 4, Mr = 965.35, Dc = 0.953 g·cm^(-3), F(000) = 1955.5, μ = 0.881 mm^(–1), GOOF = 1.072, the final R = 0.0859 and w R = 0.2424 for 5284 observed reflections with I > 2σ(I). The structure of 1 is constructed from the linkage of trinuclear {Ni_3} second building units through TPTC and IN spacers, forming a 4,8-connected network of Schl?fli symbol {32.42.52}{34.***.58.68.72}. The CO2 uptake values for 1 are 97.9 m^2·g^(-1) at 273 K and 66.2 m^2·g^(-1) at 298 K, while its N_2 adsorption values are 8.5 m^2·g^(-1) at 273 K and 4.9 m^2·g^(-1) at 298 K, respectively. These results show that 1 has high CO_2/N_2 adsorption selectivity at ambient conditions.

关键词： trimeric nickel complex crystal structure gas adsorption

Numerical simulation and method study of X-ray litho-density logging

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2020年第12期31卷 129-138页

作者： Hua-Wei Yu Yu-Xin Zhang Xiang-Hong Chen Wen-Ding Wang chao-zhuo Liu Key Laboratory of Deep Oil and Gas China University of Petroleum(East China)Qingdao 266580China School of Geosciences China University of Petroleum(East China)Qingdao 266580China College of Science China University of Petroleum(East China)Qingdao 266580China

To effectively replace the isotope radiation source in litho-density logging,this study presents a method for measuring the formation density and photoelectric absorption index(Pe)using a switchable X-ray ***,the gamma-ray litho-density logging(GLD)method for measuring formation density and Pe using chemical sources is ***,a benchmark verification based on the X-ray litho-density logging tool prototype and data published by Simon(In:Paper presented at the SPWLA 59th annual logging symposium,London,UK,2018)was carried out using Monte Carlo numerical ***,the impacts of the photoelectric effect and detector statistical error on the GLD method were ***,based on a theoretical analysis,the formation density and Pe measurement algorithm(double energy window(DEW)method)was improved,which was found to be suitable for X-ray litho-density ***,the results obtained using this algorithm were compared with those obtained using the GLD *** results indicate that owing to the impact of photoelectric effect and detector statistical error on the density energy window,the accuracy of formation density and Pe measurement using the GLD method is relatively low,with the uncertainty in formation density and Pe measurement reaching 2.620±0.047 g/cm3 and 4.090±0.580 b/e,*** comparison,the DEW method can improve the accuracy of density and Pe measurement to 0.006 g/cm3 and 0.065 b/e,respectively,as the photoelectric effect in the density window is corrected using the counts in the lithology window of the energy *** study aims to provide a new theoretical foundation for processing X-ray litho-density logs in the future.

关键词： X-ray controllable source Litho-density logging Monte Carlo simulation

Sub-solvus Cellular Recrystallization and P Phase Formation in a Single-Crystal Superalloy Containing Re

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2015年第1期28卷 72-76页

作者： Long-chao zhuo Ming Huang Ji-Chun Xiong Jia-Rong Li Jing Zhu The State Key Laboratory of New Ceramics and Fine Processing Laboratory of Advanced Materials (MOE) School of Materials Science and Engineering National Center for Electron Microscopy in Beijing Tsinghua University Science and Technology on Advanced High Temperature Structural Materials Laboratory Beijing Institute of Aeronautical Materials

Sub-solvus recrystallization behavior of a second-generation single-crystal superalloy has been studied by transmission electron microcopy and scanning transmission electron microcopy. Surface local stress facilitated cellular recrystallization accompanied with formation of twin structure and TCP phase of P during annealing at sub-solvus temperature of 1,100 °C. The precipitation of P phase is considered to be attributed to the coarsening of c0 phase in the recrystallized aggregates which lower the activation energy for atomic migration.

关键词： Nickel-based single-crystal superalloys Interfaces Recrystallization Twin boundary STEM

Effect of Deformation Temperature on Deformation Mechanism of Fe-6.5Si Alloys with Different Initial Microstructures

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2016年第4期23卷 344-349页

作者： Hua-dong FU Yuan-ke MO Long-chao zhuo Zhi-hao ZHANG Jian-xin XIE Institute for Advanced Materials and Technology University of Science and Technology Beijing School of Materials Science and Engineering Xi'an University of Technology

Deformation behaviors and mechanisms under different temperatures for columnar-grained Fe 6.5Si （mass%） alloys fabricated by directional solidification and equiaxed grained Fe-6.5Si alloy fabricated by forging were comparatively investigated. The results showed that, with increasing the deformation temperature from 300℃ to 500℃, the elongation increased from 2.9% to 30.1% for the equiaxed-grained Fe-6.5Si alloy, while from 6.6% to about 51% for the columnar-grained Fe-6.5Si alloy. The deformation mode of equiaxed-grained Fe 6.5Si alloy trans ferred from nearly negligible plastic deformation to large plastic deformation dominated by dislocation slipping. Comparatively, the deformation mode of the columnar grained alloy transferred from nearly negligible plastic deformation to plastic deformation dominated by the twining, and finally to plastic deformation dominated by dislocation slipping. Meanwhile, compared with the alloy with equiaxed grains, it was found that ultimate tensile strength and elongation could be increased simultaneously, which was ascribed for the twinning deformation in columnar-grained Fe-6.5Si al loy. This work would assist us to further understand the plastic deformation mechanism of Fe-6.5Si alloy and pro vide more clues for high-efficiency production of the alloy.

关键词： Fe-6.5Si alloy deformation behavior microstructure control mechanical property tensile deformation

Effect of Warm Rolling on Micro-deformation Behavior and Mechanical Properties of Columnar-grained Fe-6.5 mass%Si Alloy

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2016年第3期23卷 225-230页

Micro-deformation behavior and mechanical properties of columnar-grained Fe-6.5 mass%Si alloy before and after warm rolling were investigated by means of micro-indentation and three-point bending *** results show that the columnar-grained Fe-6.5mass%Si alloy before warm rolling presents sink-in mode of micro-indentation,while pile-up mode with a number of arc-shaped deformation bands exists in the warm-rolled *** with that of the alloy before warm rolling,the maximum bending fracture stress and maximum bending fracture deflection of the warm-rolled alloy are increased by 96% and 50%,*** different micro-deformation behavior and mechanical properties of the columnar-grained Fe-6.5mass%Si alloy are ascribed to the changes of dislocation density,dislocation configuration and long-range order degree,which significantly improve the room temperature plasticity of the alloy after warm rolling.

关键词： Fe-6.5mass%Si alloy warm rolling micro-deformation mechanical property

Furazolidone-induced pulmonary toxicity in Helicobacter pylori infection:Two case reports

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2023年第12期11卷 2832-2838页

作者： Yao Ye Zi-Ling Shi zhuo-chao Ren Yi-Lan Sun Geriatric Medicine Center Department of Pulmonary and Critical Care MedicineZhejiang Provincial People’s HospitalAffiliated People’s HospitalHangzhou Medical CollegeHangzhou 310014Zhejiang ProvinceChina Graduate School of Clinical Medicine Bengbu Medical CollegeBengbu 233000Anhui ProvinceChina

BACKGROUND Helicobacter pylori(***)infection is a global problem,causing significant morbidity and *** is recommended to eradicate *** infections in China owing to the highly associated antibiotic *** SUMMARY This article presents two cases of lung injury caused by furazolidone treatment of *** infection and the relevant literature *** patients developed symptoms,including fever,cough,and fatigue after receiving a course of furazolidone for *** *** computed tomography showed bilateral interstitial *** studies revealed elevated blood eosinophil *** discontinuing furazolidone with or without the use of corticosteroids,the symptoms improved rapidly.A PubMed database literature search revealed three reported cases of lung injury suggestive of furazolidone-induced pulmonary *** Clinicians should be aware of the side effects associated with the administration of furazolidone to eradicate *** infection.

关键词： Furazolidone Helicobacter pylori infection Pulmonary hypersensitivity Case report

Nonlinear amplitude versus angle inversion for transversely isotropic media with vertical symmetry axis using new weak anisotropy approximation equations

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 2020年第3期17卷 628-644页

作者： Lin Zhou zhuo-chao Chen Jing-Ye Li Xiao-Hong Chen Xing-Ye Liu Jian-Ping Liao Hunan Provincial Key Laboratory of Shale Gas Resource Utilization Hunan University of Science and TechnologyXiangtan 411201HunanChina State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing 102249China National Engineering Laboratory for Offshore Oil Exploration.China University of Petroleum Beijing 102249China College of Geology and Environment Xi'anUniversity of Science and TechnologyXi'an 710054ShaanxiChina

In VTI media,the conventional inversion methods based on the existing approximation formulas are difficult to accurately estimate the anisotropic parameters of reservoirs,even more so for unconventional reservoirs with strong seismic ***,the above problems can be solved by utilizing the exact reflection coefficients ***,their complicated expression increases the difficulty in calculating the Jacobian matrix when applying them to the Bayesian deterministic ***,the new reduced approximation equations starting from the exact equations are derived here by linearizing the slowness *** relatively simple form and satisfactory calculation accuracy make the reduced equations easy to apply for inversion while ensuring the accuracy of the inversion *** addition,the blockiness constraint,which follows the differentiable Laplace distribution,is added to the prior model to improve contrasts between ***,the concept of GLI and an iterative reweighted least-squares algorithm is combined to solve the objective ***,we obtain the iterative solution expression of the elastic parameters and anisotropy parameters and achieve nonlinear AVA inversion based on the reduced *** test results of synthetic data and field data show that the proposed method can accurately obtain the VTI parameters from prestack AVA seismic data.

关键词： Transversely isotropic media with vertical symmetry axis(VTI) New reduced approximation equations Differentiable Laplace distribution Blockiness constraint