检索结果-南通市图书馆

Neural Regeneration Research 2012年第21期7卷 1645-1649页

作者： Gang Chen qiang fu Jiangbei cao Weidong Mi Anesthesia and Operation Center PLA General Hospital Beijing 100853 China

We intraperitoneally injected 10 and 50 mg/kg of propofol for 7 consecutive days to treat a rat model of chronic cerebral ischemia. A low-dose of propofol promoted the expression of brain-derived neurotrophic factor, tyrosine kinase receptor B, phosphorylated cAMP response element binding protein, and cAMP in the hippocampus of aged rats with chronic cerebral ischemia, but a high-dose of propofol inhibited their expression. Results indicated that the protective effect of propofol against cerebral ischemia in aged rats is related to changes in the expression of brain-derived neurotrophic factor and tyrosine kinase receptor B in the hippocampus, and that the cAMP-cAMP responsive element binding protein pathway is involved in the regulatory effect of propofol on brain-derived neurotrophic factor expression.

关键词： propofol chronic cerebral ischemia aged brain-derived neurotrophic factor tyrosine kinasereceptor B cAMP-cAMP responsive element binding protein neural regeneration

Novel thick-target inverse kinematics method for the astrophysical ^(12)C+^(12)C fusion reaction

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2024年第11期35卷 237-243页

作者： Wei-Ke Nan You-Bao Wang Yao-De Sheng Jun Su Yu-qiang Zhang Lu-Yang Song Yang-Ping Shen fu-qiang cao Chen Chen Chao Dong Yun-Ju Li Zhi-Hong Li Gang Lian Wei Nan qiang Wang Na Song Sheng-Quan Yan Seng Zeng Qi-Wen Fan Hao Zhang Ming-Hao Zhu Bing Guo Wei-Ping Liu China Institute of Atomic Energy P.O.Box 275(10)Beijing 102413China Key Laboratory of Beam Technology and Material Modification of Ministry of Education College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China Institute of Radiation Technology Beijing Academy of Science and TechnologyBeijing 100875China School of Physics Xi’an Jiaotong UniversityXi’an 710049China Department of Physics Southern University of Science and TechnologyShenzhen 518055China

The ^(12)C+^(12)C fusion is one of the most important reactions in modern nuclear *** trend and magnitude of the reaction rate within the Gamow window strongly influence various astrophysical ***,direct measurement of this reaction is extremely difficult,which makes it necessary to develop indirect *** this study,the ^(23)Na+p reaction system was used to study the compound nucleus ^(24)*** employed a thick-target inverse kinematics method combined with theγ-charged-particle coincidence technique to measure the proton andα exit channels of ^(24)*** details of the ^(23)Na+p thick-target inverse kinematics experiment and analysis are presented herein.

关键词： Nuclear astrophysics ^(12)C+^(12)C Thick-target inverse kinematics method γ-charged particle coincidence

Optimizing the key parameter to accelerate the recovery of AMOC under a rapid increase of greenhouse gas forcing

在线全文

学校读者我要写书评

暂无评论

Atmospheric and Oceanic Science Letters 2025年第1期18卷 39-45页

作者： Haolan Ren Fei Zheng Tingwei cao qiang Wang International Center for Climate and Environment Science(ICCES) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina University of Chinese Academy of Sciences BeijingChina College of Oceanography Hohai UniversityNanjingChina CAS Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of Sciences and Pilot National Laboratory for Marine Science and Technology(Qingdao)QingdaoChina

Atlantic Meridional Overturning Circulation(AMOC)plays a central role in long-term climate variations through its heat and freshwater transports,which can collapse under a rapid increase of greenhouse gas forcing in climate *** studies have suggested that the deviation of model parameters is one of the major factors in inducing inaccurate AMOC *** this work,with a low-resolution earth system model,the authors try to explore whether a reasonable adjustment of the key model parameter can help to re-establish the AMOC after its *** a new optimization strategy,the extra freshwater flux(FWF)parameter is determined to be the dominant one affecting the AMOC’s *** traditional ensemble optimal interpolation(EnOI)data assimilation and new machine learning methods are adopted to optimize the FWF parameter in an abrupt 4×CO_(2) forcing experiment to improve the adaptability of model parameters and accelerate the recovery of *** results show that,under an abrupt 4×CO_(2) forcing in millennial simulations,the AMOC will first collapse and then re-establish by the default FWF parameter ***,during the parameter adjustment process,the saltier and colder sea water over the North Atlantic region are the dominant factors in usefully improving the adaptability of the FWF parameter and accelerating the recovery of AMOC,according to their physical relationship with FWF on the interdecadal timescale.

关键词： Recovery of AMOC 4×CO_(2)forcing Key parameter Parameter estimation Data assimilation Machine learning

Direct measurement of the resonance strengths and branching ratios of low-energy(p,γ)reactions on Mg isotopes

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2021年第8期45卷 132-138页

作者： Hao Zhang Zhi-Hong Li Jun Su Yun-Ju Li Chen Chen Long Zhang fu-qiang cao Yang-Ping Shen Wei Nan Wei-KeNan Xin-Yue Li Li-Hua Chen Gang Lian Bao-Qun Cui Bing Guo Wei-Ping Liu China Institute of Atomic Energy Beijing 102413China University of Chinese Academy of Science Beijing 101408China Beijing Normal University Beijing 100875China

Proton capture reactions on Mg isotopes are significant in the Mg-Al cycle in stellar *** particular,the resonance strengths and branching ratios of low-energy resonances in 23Mg(p,γ)26Al reactions determine the production of which is one of the most important long-lived radioactive nuclei in nuclear *** this article,we report our first experiment using the intense proton beam of approximately 2 mA provided by the JUNA accelerator ground laboratory and a new technique that can minimize the composition change of targets under intense beam *** resonance strengths and branching ratios of E=214,304,and 326 keV resonances in the reactions of 2~4Mg(p,γ)25Al,25Mg(p,γ)26Al,and 26Mg(p,γ)27Al,respectively,were measured with high *** success of this experiment provides a good calibration for the nuclear astrophysical experiment at the Jinping underground laboratory.

关键词： stellar hydrogen burning resonance reactions radiative capture

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

在线全文

学校读者我要写书评

暂无评论

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

Preparation mechanism,physical characteristic and antitumor activity of nano-scheelite

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2009年第4期16卷 468-474页

作者： Lin cao fu-qiang Yang Jie-xin cao School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Peking University Health Science Center Beijing 100083 China

After preparing the EU^3＋-doped scheelite nano-material by Pechini method with the nanoparticles of 30-50 nm in diameter, X-ray diffraction （XRD）, transmission electron microscopy （TEM） and high resolution transmission electron microscopy （HRTEM） were used to show a microcosmic description of the particle morphology and crystal structure. The spectrum signature of the nano-scheelite, which was taken by fluorescence spectrometer, was used to discuss the difference of luminescent performance between the nano-scheelite and bulk scheelite. The atomic site of the nano-scheelite was intuitively shown through HRTEM images and HRTEM simulated images from the relation between luminescent properties and crystal structure, which was analyzed by spectrum probe. The results of antitumor activity examined by the 3-（4,5-dimethylthiazol-2-yl）-2,5-diphenyltetrazolium bromide （MTT） method show that the inhibition of human promyelocytic leukemia cell line （HL60） is enhanced immediately with increasing the concentration and presents a reliance on the quantity. The results of fluorescence spectra and structure show that the antitumor activity has something to do with micro-structure and surface charge.

关键词： scheelite fluorescence spectrum atomic site anti-tumor activity

JJ- 磁性固位体金属材料的生物相容性评价

在线全文

学校读者我要写书评

暂无评论

上海口腔医学 2001年第2期10卷 116-118页

作者：张富强曹洪喜上海第二医科大学附属第九人民医院口腔医学院口腔修复科上海200011

目的　了解JJ 磁性固位体金属材料的生物相容性。方法　选用细胞毒性试验、口腔粘膜刺激试验、急性经口毒性试验、溶血试验、致敏试验、Ames试验等 6个试验 ,分别对JJ 磁性固位体金属材料的毒性、致敏性和致突变性进行研究测试。结果　... 详细信息

目的　了解JJ 磁性固位体金属材料的生物相容性。方法　选用细胞毒性试验、口腔粘膜刺激试验、急性经口毒性试验、溶血试验、致敏试验、Ames试验等 6个试验 ,分别对JJ 磁性固位体金属材料的毒性、致敏性和致突变性进行研究测试。结果　细胞毒性试验显示 ,试验组毒性分级为I级 ;口腔粘膜刺激试验 ,试验组无论肉眼观察还是组织切片 ,均与阴性对照无显著性差异 ;急性经口毒性试验 ,试验组属于无毒类 ;溶血试验的试验组溶血率为0 .45 % ;致敏试验显示试验组不引起致敏反应 ;Ames试验的试验组在各剂量组对TA97、TA98、TA10 0 、TA10 2 的回变菌落数与自发回变数相近 ,无致基因突变作用。结论　JJ

关键词：牙科金属材料生物相容性毒性

PVP/PAN-derived porous carbon fiber for zinc-ion hybrid supercapacitors

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第7期43卷 3066-3073页

作者： Shu-Hua Yang Wen-Qing fu Yan-Wei Cui Bing-qiang cao Materials Center for Energy and Photoelectrochemical Conversion School of Material Science and EngineeringUniversity of JinanJinan 250022China

Porous carbon fibers are promising cathodes for zinc-ion hybrid supercapacitors(ZHSs)owing to their abundant active sites,great conductivity,and stable physical and chemical ***,designing a proper preparation technique to regulate the microstructure of carbon fibers still remains a great ***,a poly vinylpyrrolidone/po-lyacry lonitrile(PVP/PAN)-derived porous carbon fiber is developed via the PVP/PAN blend electrospinning and hydrothermal selective PVP removal *** hydrothermal selective PVP removal strategy can effectively avoid a cross-linking between PVP and PAN during the traditional stabilization at air *** PVP/PAN-derived porous carbon fiber,the sufficient micropores provide abundant space for the Zn^(2+)storage,whereas the proper mesopores contribute to the fast ion *** hierarchical porous structures endow ZHSs with high specific capacity and high-rate *** ZHS assembled with the optimal PVP/PAN-derived porous carbon fiber(PVP-PANC-0.8)displays an outstanding specific capacity of 208 mAh·g^(-1),high rate capability(49.5%)from 0.5 to 5 A·g^(-1),and 72.25%capacity retention after 10,000 cycles at 0.5 A·g^(-1).

关键词： Zinc-ion hybrid supercapacitors Porous carbon fibers Hierarchical porous structures Electrospinning

Effect of plough pans on the growth of soybean roots in the black-soil region of northeastern China

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2017年第10期16卷 2191-2196页

作者： DONG Wen-cai fu qiang WANG Quan-jiu cao Cheng-peng College of Water Conservancy and Architecture Northeast Agricultural University Institute of Water Resources Xi'an University of Technology

Plough pans （PPs）, common in the black-soil region of northeastern China, have significant effects on the root systems of crops. We conducted a field experiment to study the distribution of soybean roots under the influence of PPs. The soybean roots showed compensatory growth above the PP, with higher root length and weight in soil with a PP compared to those without a PP. Roots were heavier and longer in the 15-75 cm soil layer without a PP than with a PP. Soil porosity was lower in the PP and the soil below the PP, which likely decreased the oxygen content of the soil and induced more growth of roots above the PP. The PP is also likely to decrease infiltration of rain-water and hinder the migration of nitrate downward, which in turn increased the density and length of soybean root hairs, which, hence, promoted growth.

关键词： compensatory growth plough pans root characteristics soybean

Microstructural refinement and performance improvement of Cu-36 wt%Zn alloy by Al_(2)O_(3)nanoparticles coupling electromagnetic stirring

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2022年第10期41卷 3560-3565页

作者： Ya-Bo fu Yi-Ping Lu Zhi-Jun Wang Zhi-qiang cao Ai-Jiao Xu School of Physics and Electronic Engineering Taizhou UniversityTaizhou318000China School of Materials Science and Engineering Dalian University of TechnologyDalian116024China School of Materials Science and Engineering Northwestern Polytechnical UniversityXi’an710048China

Cu-36 wt%Zn alloy is widely used in valves of water and heating and auto parts,***,the structure is still coarse,and performances are much *** structure and performances of Cu-36 wt%Zn alloy were investigated by adding Al_(2)O_(3)nanoparticles and *** indicate that by Al_(2)O_(3)nanoparticles coupling electromagnetic stirring,the Cu-36 wt%Zn alloy with refined microstructure was successfully *** average grain size is refined by 99%compared with that without nanoparticles and *** tensile strength(R_m)and percentage elongation after fracture(A11.3)increase by 20.58%and 19.40%,respectively,compared with that without nanoparticles and *** increase heterogeneous nucleation rate by 50%compared with that without *** depth of dezincification layer decreases by 78.71%compared with that without nanoparticles and stirring,as protective layer(Cu-Al_(2)O_(3)-Zn)is completely formed around the grain boundaries.

关键词： Microstructural refinement Rotating electromagnetic field Mechanical performance Al_(2)O_(3)nanoparticles