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Direct measurement of the break-out ^(19)F(p,γ)^(20)Ne reaction in the China Jinping underground laboratory(CJPL)

Nuclear Science and Techniques 2024年第8期35卷 142-152页

作者： Yin‑Ji Chen Hao zhang li‑yong zhang Jian‑Jun He Richard James deBoer Michael Wiescher Alexander Heger David Kahl Jun Su Daniel Odell Xin‑Yue li Jian‑Guo Wang Long zhang Fu‑Qiang Cao Zhi‑Cheng zhang Xin‑Zhi Jiang Luo‑Huan Wang Zi‑Ming li Lu‑Yang Song liang‑Ting Sun Qi Wu Jia‑Qing li Bao‑Qun Cui li‑Hua Chen Rui‑Gang Ma Er‑Tao li Gang lian Yao‑De Sheng Zhi‑Hong li Bing Guo Wei‑Ping liu Key Laboratory of Beam Technology of the Ministry of Education College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China Department of Physics and Astronomy The Joint Institute for Nuclear AstrophysicsUniversity of Notre DameNotre DameIN 46556USA School of Physics and Astronomy Monash UniversityClaytonVIC 3800Australia Facility for Rare Isotope Beams Michigan State UniversityEast LansingMI 48824USA Institute of Nuclear and Particle Physics and Department of Physics and Astronomy Ohio UniversityAthensOH 45701USA Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China China Institute of Atomic Energy Beijing 102413China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China College of Science Southern University of Science and TechnologyShenzhen 518055China Institute of Radiation Technology Beijing Academy of Science and TechnologyBeijing 100875China Key Laboratory of Nuclear Physics and Ion‑Beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China School of Mathematics and Physics Handan UniversityHandan 056005China

Calcium production and the stellar evolution of first-generation stars remain fascinating mysteries in *** one possible nucleosynthesis scenario,break-out from the hot carbon–nitrogen–oxygen(HCNO)cycle was thought to be the source of the calcium observed in these oldest ***,according to the stellar modeling,a nearly tenfold increase in the thermonuclear rate ratio of the break-out ^(19)F(p,γ)^(20) Ne reaction with respect to the competing ^(19)F(p,α)^(16) O back-processing reaction is required to reproduce the observed calcium *** performed a direct measurement of this break-out reaction at the China Jinping underground *** measurement was performed down to the low-energy limit of E_(c.m.)=186 keV in the center-of-mass *** key resonance was observed at 225.2 keV for the first *** a temperature of approximately 0.1 GK,this new resonance enhanced the thermonuclear ^(19)F(p,γ)^(20) Ne rate by up to a factor of≈7.4,compared with the previously recommended NACRE *** is of particular interest to the study of the evolution of the first stars and implies a stronger breakdown in their“warm”CNO cycle through the ^(19)F(p,γ)^(20) Ne reaction than previously *** break-out resulted in the production of the calcium observed in the oldest stars,enhancing our understanding of the evolution of the first stars.

关键词： Nuclear astrophysics First stars Abundance of calcium Reaction cross section Reaction rate China Jinping underground laboratory(CJPL) JUNA

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Simulation of Gas Flow Field in Laval Nozzle and Straight Nozzle for Powder Metallurgy and Spray Forming

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Journal of Iron and Steel Research International 2008年第6期15卷 44-47页

作者： li Zheng-dong zhang Guo-qing li Zhou zhang yong XU Wen-yong National Key Laboratory of High Temperature Structural Materials Beijing Institute of Aeronautical Materials Beijing 100095 China

Gas flow field in nozzles and out of nozzles was calculated for Laval orifice and straight orifice nozzles. The results showed that the flow generated by the Laval nozzle had a higher exit velocity in the vicinity of the nozzle, in comparison with that of the straight nozzle, that is to say, a Laval nozzle was more efficient than a straight one in disintegrating the melt stream and was apt to produce finer powders. The flow generated by the Laval nozzle was less convergent and the velocity gradient along the radial direction was more moderate than that of a straight nozzle, which could contribute to a broad distribution of melt particles. According to their flow characteristics, the Laval nozzle was reckoned as a better choice of producing larger spray-formed billets.

关键词： numerical simulation computational fluid dynamics gas flow field atomization nozzle

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Generalized Dual Symmetry Mechanical Performance of Nano Magnetic Composite

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上海交通大学学报 2004年第Z2期38卷 48-53页

作者： li yong Song Jian zhang Z.M Department of Applied Mechanics Beijing Institute of Technology Beijing100081 China State Key Laboratory of Automotive Safety And Energy Tsinghua University Beijing100084China State Key Laboratory of Automotive Safety And Energy Tsinghua University Beijing100084China Center of Solid Mechanics Beijing University of Aeronautics and AstronauticsBeijing100083China

Nano magnetic composite is a kind of heterogeneous material. Scientists found the symmetrical and dual symmetrical phenomena in its structure previously and we find the generalized dual symmetry mechanical performance in Nano Magnetic Composite and further establish the theory. The applicable nano magnetic composite structure is analyzed thoroughly and systematically. Such phenomena as serration and step dispersing distribution of bending stress and mirror reflection of interlaminar stress are thus found. Therefore, starting from the physical features of materials, Nano Magnetic Composite are analyzed on the basis of the understanding and application of the generalized dual symmetry mechanical performance. In addition, the design parameter is optimized to attain the goal of maximizing the use of materials, which is quite meaningful.

关键词： nano magenetic composite dual symmetrical heterogeneous model

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Preparation of ^(99m)Tc-HYNIC-Annexin V

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Nuclear Science and Techniques 2005年第5期16卷 299-303页

作者： LAN Xiao-li zhang yong-Xue Department of Nuclear Medicine Union Hospital Tongji Medical College Huazhong University of Science and Technology Wuhan 430022

99mTc-HYNIC-Annexin V was prepared for apoptosis radionuclide imaging in vivo. The expression plas-mid of human Annexin V was constructed and expressed in E. coli.. HYNIC was prepared and used as bifunctional chelating agent for 99mTc labeling. The radiochemical purity, radiolabeling yield and stability of 99mTc-HYNIC-Annexin V were studied. The coding sequence of human Annexin V gene was successfully cloned into the expression vector, and highly expressed in E. coli. A protein with a molecular weight of about 36kD could be in-duced and confirmed by Western Blotting and SDS-PAGE. Annexin V could be labeled with 99mTc using HYNIC,and showed high radiochemical purity of more than 90%. The radiolabeling yield could reach more than 90%. The reac-tion condition was moderate. It suggested that 99mTc-HYNIC-Annexin V may be a promising agent for apoptosis im-aging and clinical application.

关键词： HYNIC 放射性医学同位素治疗方法

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Stellar reaction rate of 55Ni（p,γ）56Cu in Type I X-ray bursts

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Nuclear Science and Techniques 2019年第9期30卷 94-102页

作者： Shao-Bo Ma li-yong zhang Jun Hu Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China University of Chinese Academy of Sciences Beijing 100049 China College of Nuclear Science and Technology Beijing Normal University Beijing 100875 China

56Cu is close to the waiting-point nucleus 56Ni and lies on the rapid proton capture（rp） process path in Type I X-ray bursts（XRBs）. In this work, we obtained a revised thermonuclear reaction rate of 55Ni（p,γ）56Cu in the temperature region relevant to XRBs. This rate was recalculated based on the recent experimental level structure in 56Cu, the recently measured proton separation energy of Sp = 579.8（7.1） keV, together with shell-model calculation, and the mirror nuclear structure in 56Co. The associated uncertainties in the rates were estimated by a Monte Carlo method. Our revised rate is significantly different from the recent results, which were partially based on experimental results; in addition, we found that a result in a previous work was incorrect. We recommend our revised rate to be incorporated in the future astrophysical network calculations.

关键词： Nuclear astrophysics Reaction rate X-ray burst

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Transcriptomic Analysis of the Highly Heterotic Maize Hybrid Zhengdan 958 and Its Parents During Spikelet and Floscule Differentiation

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Journal of Integrative Agriculture 2012年第11期11卷 1783-1793页

作者： li Zhi-yong zhang Ti-fu WANG Shou-cai National Maize Improvement Center/Maize Breeding Engineering Center Ministry of Education~Key Laboratory of Crop Genomicsand Genetic Improvement Ministry of Agriculture~College of Agriculture and Biotechnology China Agricultural University Beijing100193 P.R.China

Heterosis plays an important role in crop production and plant evolution. Although heterosis has been widely exploited by plant breeders, the underlying molecular mechanisms are not well understood. We analyzed gene expression of the highly heterotic maize hybrid Zhengdan 958 and its parents, Zheng 58 and Chang 7-2 during spikelet and floscule differentiation using the GeneChip Maize Genome Array. Pairwise comparison among Zhengdan 958 and its parents at the two stages of immature ear development identfied 1 089 and 1 352 differentially expressed genes. Gene ontology （GO） functional analysis showed that these genes participate in many functional categories, and those encoding response to stress and transcription factor may play important roles in heterosis. Pathway analysis showed that the differentially expressed genes are involved in various metabolic processes, and those participating in lipid metabolism, signal transduction, transport, and catabolism may contribute to heterosis. A non-additive expression pattern was prevalent in genes that were differentially expressed between the hybrid and its parents during both spikelet and floscule differentiation. Because genes that are differentially expressed in a hybrid and its parents could underlie heterosis, nonadditive expression patterns might contribute to the manifestation of heterosis.

关键词： maize heterosis microarray gene expression Zhengdan 958 spikelet floscule

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Intraoperative pulmonary hypertension occurred in an asymptomatic patient with pre-existent liver cirrhotic and portal hypertension

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World Journal of Gastroenterology 2008年第47期14卷 7260-7263页

作者： ling Lu Feng zhang Xiang-Cheng li Guo-Qiang li Chuan-yong zhang Xue-Hao Wang Key Laboratory of livingDonor liver Transplantation of Ministry of Public Health Department of Liver Transplantation the First AffiliatedHospital of Nanjing Medical University Nanjing 210029Jiangsu Province China

Portopulmonary hypertension(PPH) is clinically defined as the development of pulmonary arterial hypertension complicated by portal hypertension,with or without advanced hepatic *** signs may be absent in mild to moderate PPH and only appear in a hyperdynamic circulatory *** signs of advanced liver disease can be observed in severe PPH,with ascites and lower extremity *** hypertension is usually diagnosed after anesthetic induction during liver transplantation(LT).We present intraoperative pulmonary hypertension in a 41-year-old male patient with hepatic *** this patient had no preoperation laboratory data supporting the diagnosises of pulmonary hypertension and was asymptomatic for a number of years,it was necessary to send him to the intensive care unit after *** study should be focued on the diagnosis and treatment of pulmonary arterial hypertension in order to reduce its mortality.

关键词： Pulmonary hypertension liver transplantation Portal hypertension Cirrhosis Hepatitis

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Ethical issues in penile transplantation

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Asian Journal of Andrology 2010年第6期12卷 795-800页

作者： li-Chao zhang yong-Bing Zhao Wei-lie Hu Department of Urology Guangzhou General Hospital of Guangzhou Military Command Guangzhou 510010 China

This article provides an overview of the ethical issues associated with penile transplantation, a form of composite tissue allografting. There is only one reported case of human penile transplantation, and, as such, this technique is considered to be experimental. The ethical issues at stake involve both the graft donor and the graft recipient. With regard to the recipient, there are significant concerns relating to surgical risks and benefits, informed consent, body image （including surgical expectations and outcomes） and compliance. Donor issues may include family consent and privacy, as well as graft harvesting （leaving the donor cadaver without a penis）. Many of these ethical issues can be explored during the recipient＇s assessment and consent process. Because no medium-term or long-term outcome data for this procedure exist---only one such operation has ever been performed--the burdens and ethical issues concerning penile transplantation remain unknown.

关键词： ethics penis transplantation

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Design method of multivariable PI controller for turboprop engine based on equivalent transfer function

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Chinese Journal of Aeronautics 2024年第9期37卷 237-260页

作者： Shancheng li yong WANG Haibo zhang Jiangsu Province Key Laboratory of Aerospace Power System College of Energy and Power EngineeringNanjing University of Aeronautics and AstronauticsNanjing 210016China

Traditional centralized Proportional Integral(PI)controller design methods based on Equivalent Transfer Functions(ETFs)have poor decoupling effect in turboprop *** this paper,a centralized PI design method based on dynamic imaginary matrix and equivalent transfer function is ***,a method for solving equivalent transfer functions based on the dynamic imaginary matrix is proposed,which adopts dynamic imaginary matrix to describe the dynamic characteristics of the system,and obtains the equivalent transfer function based on the dynamic imaginary matrix ***,for the equivalent transfer function,a central-ized PI control gain is designed using the Taylor expansion ***,this paper further proves that the centralized PI design method proposed in this paper has integral ***-ering the impact of altitude and Mach number on turboprop engines,a linear feedforward control method based on the transfer function matrix is further proposed based on the centralized PI con-troller,and the stability of the entire comprehensive control method is ***,to ensure the safe and effective operation of the turboprop engine,a temperature and torque limiting protection controller is designed for the turboprop *** results show that the centralized PI con-troller design method and linear feedforward control method proposed can effectively improve the control quality of turboprop engine control systems.

关键词： Multivariable control sys-tems Equivalent transfer function Disturbance compensation control Control parameter design Turboprop engine control

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New Dimeric Selenidoarsenate(III):Solvothermal Synthesis and Crystal Structure of [Co(en)_3]_2As_2Se_5

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Chinese Journal of Structural Chemistry 2006年第9期25卷 1110-1114页

作者： JIA Ding-Xian ZHAO Qian-Xin SONG li-Feng zhang yong DAI Jie Department of Chemistry and Chemical Engineering Suzhou University Suzhou 215006 China

A new selenidoarsenate [Co（en）3]2As2Se5 1 （en = ethylenediamine） was synthesized by a reaction of AsCI3, CoCl2-6H2O and Se in en under mild solvothermal conditions, and the structure was determined by single-crystal X-ray diffraction. 1 crystallizes in the orthorhombic system, space group Pbca with a = 15.5092（12）, b = 11.5756（9）, c = 17.8138（14） A, V = 3198.1（4） A^3, Mr= 1023.12, Z = 4, D, = 2.125 g/cm^3,μ = 8.807 mm^-1, F（000） = 1976, S = 1.171, the final R = 0.0591 and wR = 0.1067 for 3170 observed reflections with 1 〉 2σ（I）. 1 consists of isolated dimeric [As2Se5]^4- anion constructed by two corner-sharing AsSe3 trigonal pyramids and transition metal [Co（en）3]^2＋ cations. The optical absorption property and thermal stability of 1 are reported.

关键词： solvothermal synthesis crystal structure selenidoarsenate ethylenediamine

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