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Effects of Zn, Zn-Al and Zn-P Additions on the Tensile Properties of Sn-Bi Solder

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Acta Metallurgica Sinica(English Letters) 2014年第6期27卷 1159-1164页

作者： Xiaojing Wang Yanlai Wang Fengjiang Wang ning liu Jianxin Wang School of Material and Science Engineering Jiangsu University of Science and Technology Key Laboratory of Semiconductor Photovoltaic Technology of Inner Mongolia Autonomous Region School of Physical Science and Technology Inner Mongolia University

Effects of Zn, Zn-Al and Zn-P additions on melting points, microstructures, tensile properties, and oxidation behaviors of Sn-40 Bi lead-free solder were investigated. The experimental results show that the addition of these three types of elements can refine the microstructures and improve the ultimate tensile strength（UTS） of solder alloys. The fractographic analysis illustrates that ductile fracture is the dominant failure mode in tensile tests of Sn-40Bi-2Zn（SBZ）and Sn-40Bi-2Zn-0.005Al（SBZA） specimens, while brittle fracture is the controlled manner in Sn-40Bi-2Zn-0.005P（SBZP） and Sn-58 Bi solders. XPS analysis indicates that trace amounts of both Al and P additives in solder can improve the antioxidant capacity, whereas only the additive of Al in solder can reduce the thickness of oxidation film.

关键词： Sn-Bi Tensile test Microstructure

The patterns of distribution of chlorophyll a and primary production in coastal upwelling area off Zhejiang

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海洋学报(英文版) 1988年第1期7卷 126-136页

作者： ning Xiuren and liu Zilin China

-Investigations of Chi, a and primary production were carried out in the coastal upwelling area (27°’-30°30’N, west to 124°00’E) off Zhejiang in August and October 1981. The high-value areas of Chl. a were in nearshore waters and on top of the upwelling front, where Chl. a occurred the maximum 7.40 mg/m3. With the average of 1.25 g C/m2.d, the primary production was more than 2.0gC/m2·d incenteral area of the upwelling, and the whole surveyed area’s output was about 4.4 ×104 tons C/d.

关键词： chlorophyll coastal surveyed salinity waters productivity varied Photosyn photosynthetic nutrients

Preliminary analysis of chemical reaction under the radiation of electromagnetic wave

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Chinese Science Bulletin 2000年第19期45卷 1821-1824页

作者： Kama Huang ning liu Changjun liu Liping Yan Sichuan Univ Dept Elect & Radio Chengdu 610064 Peoples R China

Microwave can be used to accelerate chemical reaction and improve the rate of production. Does microwave only act as a heating factor? Do there exist any specific effects? These questions are still holding a violent controversy. Here we will choose the Belousov-Zhabotinsky reaction, which is sensitive to surrounding effects, to study the influence of microwave on chemical reactions. Visible changes of periods have been observed. It appeares that there could have been specific effects of microwave.

关键词： microwave electromagnetic wave Belousov-Zhabotinsky reaction specific effects.

Exploration of cardiac rehabilitation nursing for elderly patients with myocardial infarction based on individualized cardiac rehabilitation

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World Journal of Clinical Cases 2024年第2期12卷 256-266页

作者： Hua-ning liu Bo Gao Department of Geriatrics General Hospital of the YangTze River ShippingWuhan Brain HospitalWuhan 430015Hubei ProvinceChina Department of Cardiology Suizhou Central HospitalAffiliated Hospital of Hubei University of MedicineSuizhou 441300Hubei ProvinceChina

BACKGROUND Myocardial infarction is a high-risk condition prevalent among the elderly population,often leading to adverse clinical manifestations such as reduced cardiopulmonary function,anxiety,and depression ***,cardiac rehabilitation holds immense importance in mitigating these *** To evaluate the effect of individualized cardiac rehabilitation on blood pressure variability(BPV)and baroreflex sensitivity(BRS)in elderly patients with myocardial *** A cohort of 74 elderly patients diagnosed with myocardial infarction and admitted to our hospital between January 2021 and January 2022 were subjected to random ***,all patients were divided into two groups,namely the research group(n=37)and the control group(n=37),utilizing the number table *** control group received conventional drug treatment and nursing guidance intervention,while the study group underwent individualized cardiac rehabilitation in addition to the interventions received by the control *** patients were continuously intervened for 12 wk,and the BPV of these two groups in the 1st wk(T0),the 4th wk(T1)and the 12th wk(T2)were compared,BRS,changes in cardiopulmonary function measures,and adverse cardiovascular *** Of 24 h diastolic BPV,24 h systolic BPV,carbon dioxide ventilation equivalent slope of the research group were lower than those of the control group at T1 and T2,BRS,peak heart rate and systolic blood pressure product,1 min heart rate recovery were higher than those of the control group,and the incidence of adverse events in the research group was lower than that of the control group,the difference was statistically significant(P<0.05).CONCLUSION In this study,we found that after individualized cardiac rehabilitation in elderly patients with myocardial infarction,BPV and BRS can be effectively improved,cardiac function is significantly enhanced,and a better prognosis is obtained.

关键词： Individualized cardiac rehabilitation Myocardial infarction Variability in blood pressure Baroreflex sensitivity

Hot Deformation Behavior of SA508GR.4N Steel for Nuclear Reactor Pressure Vessels

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Journal of Iron and Steel Research International 2016年第12期23卷 1342-1348页

作者： ning liu Zheng-dong liu Xi-kou HE Zhi-qiang YANG Long-teng MA Faculty of Materials Science and Engineering Kunming University of Science and Technology Institute for Special Steels Central Iron and Steel Research Institute

A hot compression experiment （1073 1473 K, strain rates of 0. 001-10 s -1 ） of SAS08GR. 4N low alloy steel was performed using a Gleeble-3800 thermal-mechanical simulator, and the hot deformation behavior of the steel was investigated by analyzing both the true stress true strain curves and its microstructures. The thermal de formation equation and hot deformation activation energy （Q） of SA508GR. 4N steel were obtained by regression with a classic hyperbolic sine function. The hot processing map of SAS08GR. 4N steel was also established. An empirical equation for the stress peak was described for practical applications. The SA508GR. 4N steel showed a critical Zener-Hollomon parameter （lnZc） for dynamic recrystallization （DRX） of 37.44, below which full DRX may occur. The sensitivity of the SA508GR. 4N steel increased linearly with test temperature, such that higher temperatures led to enhanced workability.

关键词： SA508GR. 4N steel dynamic recrystallization hot deformation equation hot processing map ZenerHollomon parameter

PSR J1614-2230 May Include Hyperons

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Chinese Physics Letters 2011年第8期28卷 352-355页

作者： YU Zi DING Wen-Bo BAO Tmurbagan liu ning-ning The College of Science Nanjing Forestry UniversityNanjing 210037 Department of Physics Bohai UniversityJinzhou 121000 College of Physics and Electronic Engineering Nanyang Normal UniversityNanyang 473061 Department of Basic Course Nanjing Institute of TechnologyNanjing 211167

In the framework of the relativistic mean field theory,it is found that recently discovered PSR J1614-2230 with mass of 1.97±0.04Mʘmay include hyperons when the weakly interacting light boson(WILB)is *** describe PSR J1614−2230 with the equation of state(EOS)including hyperons,the characteristic scale of the WILB(g^(2)/μ^(2))should lie in the range of 13–46(24–46)GeV^(−2) with the weak(strong)hyperon-hyperon(YY)*** measurements of inertial momentum and the total neutrino luminosity of the neutron star could be used to further constrain the characteristic scale of the *** more stringent constraint on the WILB is given,the mass measurement of the neutron star could not exclude any soft EOS.

关键词： interaction weakly momentum

Mechanism of Insulator-Metal Transition in La_(2/3)Ca_(1/3)MnO_(3):Collapse of Small Polaron

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Chinese Physics Letters 2001年第7期18卷 957-959页

作者： liu ning SUN Yang ZHANG Yu-Heng Structure Research Laboratory University of Science and Technology of ChinaHefei 230026 Department of Physics Suzhou Normal CollegeSuzhouAnhui 234000

The insulator-metal(I-M)transition in colossal magnetoresistance material La_(2/3)Ca_(1/3)MnO_(3) has been studied by electrical transport,magnetization and electron spin resonance(ESR)*** the I-M transition,the ESR signal shows a crossover from paramagnetic resonance line to ferromagnetic resonance line,which implies a coexistence of localized small polarons and itinerant carriers during the I-M *** on the concept of‘small polaron collapse’,a two-phase model is proposed to quantitatively describe the electrical transport behaviour across the insulator-metal *** calculations of resistivity in different applied magnetic fields have close trends with the experimental data,which strongly proves that the I-M transition results from the collapse of small polarons and two phases coexist during the transition.

关键词： transition. polaron Transition

Cryoelectron Microscopy Delineates the In Situ Structure of the Thylakoid Network

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Molecular Plant 2019年第9期12卷 1176-1178页

作者： Lu-ning liu Yu-Zhong Zhang College of Marine Life Sciences Ocean University of ChinaQingdao 266003China Institute of Integrative Biology University of LiverpoolLiverpool L69 7ZBUnited Kingdom State Key Laboratory of Microbial Technology Marine Biotechnology Research CenterShandong UniversityQingdao 266237China Laboratory for Marine Biology and Biotechnology Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China

Photosynthesis is conceivably the most important biological process on *** performing oxygenic photosynthesis,cyanobacteria,algae,and plants can use solar energy to power their metabolism and produce sugars and oxygen for life on the *** photosynthetic organisms have evolved a specialized intracellular membrane system,the thylakoid membrane,inside the cytoplasmic membrane to carry out the reactions of photosynthesis.

关键词： sugar Structure planet

Proteomics Analysis of T Lymphocytes Damage Induced by Ionizing Irradiation

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Chinese Journal of Chemistry 2011年第1期29卷 159-164页

作者： Shi, Ying Zhang, Xuan liu, ning Liang, Feng Song, Fengrui liu, Zhiqiang liu, Shuying Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun Jilin 130022 China School of Public Health Jilin University Changchun Jilin 130021 China Central Laboratory The Second Hospital of Jilin University Changchun Jilin 130041 China College of Pharmacy Jilin University Changchun Jilin 130021 China Graduate School of the Chinese Academy of Sciences Beijing 100039 China

Human T lymphocytes were found to be highly radiosensitive and complex cellular responses including apoptosis could be induced upon exposure to X-ray irradiation. However, the mechanism of apoptosis associated with irradiation was not clear. In this study, a proteomic method was applied to investigation on alteration of proteome of human T-lymphocyte cells after irradiation. The Jurkat cells were irradiated with 4 Gy X-ray and the cell lysates were collected at different times after irradiation （6, 12, 18, 24 and 48 h）. The whole proteins were separated and quantified by two-dimensional fluorescence difference gel electrophoresis, and then the differentially expressed proteins were identified by mass spectrometry. 4 proteins exhibited significant irradiation-induced difference in abundance, including L-plastin, bifunctional purine biosynthesis protein, tubulin beta chain, beta-actin. Differentially expressed proteins were reported to be directly or indirectly involved in the function of human T lymphocyte. Thus, this study might provide clues to identify proteins with biological significance related to irradiation.

关键词： T-lymphocytes irradiation electrophoresis apoptosis proteomics L-plastin