检索结果-南通市图书馆

(Bx,Cu1-x)Sr2YCu2O7,A NEW LAYERED CUPRATE WITH BORON-OXYGEN GROUPS

在线全文

学校读者我要写书评

暂无评论

(Bx,Cu1-x)Sr2YCu2O7,A NEW LAYERED CUPRATE WITH BORON-OXYGEN ...

EXTRACTION KINETICS OF YTTRIUM WITH PURIFIED CYANEX 923 FROM NITRATE MEDIUM

Sixteenth Congress of the International Union of Crystallography

作者： W.J.Zhu Y.Z.Huang J.q.li Z.X.Zhao National Laboratory for Superconductivity Institute of PhysicsAcademia Sinica

New layered cuprates(B,CuSrYCuO have been synthesized with various boron *** crystal structures resemble that of YBaCuO,but contain boron-oxygen groups connecting (CuO) sheets beside Y layers.(B,Cu) forms solid solution with an approximate range of x = *** compound of idealized composition(B,Cu)SrYCuO crystallizes in the orthorhombic structure with cell parameters a=0.383,b=0.381 and c=1.096nm. There is a strong incommensurate modulation in the(100) plane

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2003年第6期16卷 428-432页

作者： H. Tong, Y.G. Wang, J.H. Lei, D.q. li, and P. TangDepartment of Applied Chemistry, Wuhan University of Technology, Wuhan 430070, China Key Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, The Chinese Academy of Sciences, Changchun 130022, China Dept. of Appl. Chem. Wuhan Univ. of Technol. Wuhan 430070 China Lab. of Rare Earth Chem. and Phys. Changchun Inst. of Appl. Chem. Chinese Acad. of Sci. Changchun 130022 China

Mass transfer and extraction kinetics of yttrium with the purified Cyanex 923 in n-heptane from nitrate medium have been investigated by using a constant interfacial cell with laminar flow at 298K. The interfacial adsorption properties of purified Cyanex 923-heptane-0.20mol/L (H, Na)NO3 were studied at 298K. The experimental results show that the mass transfer is controlled by diffusion and the chemical reactions are carried out in the interfacial zone. The extraction rates of yttrium were measured at different chemical compositions by varying ionic strength, pH values and the purified Cyanex 923 concentrations. The initial extraction rate equations were obtained.

关键词： yttrium Cyanex 923 extraction kinetics interfacial tension

从微型生物功能类群研究到海洋储碳机制的新认识——方法创新带动科学发现的一个典型案例

在线全文

学校读者我要写书评

暂无评论

中国科学：地球科学 2016年第3期46卷 9-17页

作者：张飞刘纪化李强邹丽洁张瑶厦门大学近海海洋环境科学国家重点实验室厦门361102 山东大学海洋研究院济南250100

海洋微型生物是海洋生物地球化学循环的主要驱动者,也是海洋能量代谢的主要参与者,在海洋生态系统中发挥着举足轻重的作用.好氧不产氧光合异养细菌(AAPB)是海洋中一类重要的功能类群,在海洋中广泛分布,它们可以利用光能补充自身的能量代... 详细信息

海洋微型生物是海洋生物地球化学循环的主要驱动者,也是海洋能量代谢的主要参与者,在海洋生态系统中发挥着举足轻重的作用.好氧不产氧光合异养细菌(AAPB)是海洋中一类重要的功能类群,在海洋中广泛分布,它们可以利用光能补充自身的能量代谢,在海洋碳循环中发挥着重要而特殊的作用.在21世纪初,由于微型生物显微荧光定量方法的弊端,人们对于AAPB分布规律的认识存在着一定的偏差."时间序列红外荧光显微数字化方法"(TIREM)的建立,修正了AAPB定量偏差,揭示了海洋中AAPB分布的真正规律.之后,对AAPB生态分布调控因素的进一步研究表明:相对于光照,溶解有机碳(DOC)对AAPB绝对丰度和相对丰度的影响更重要.此认识推翻了"AAPB通过利用光能就可以赢得与普通异养细菌竞争"这一"想当然"的理论推测.而对AAPB碳源利用特点的研究表明,此功能类群具有重要的碳分馏作用,即AAPB在碳代谢过程中,部分碳源并非简单的沿着传统生物泵方向传递.在此基础上的海洋微型生物与DOC相互作用关系研究,最终导致海洋储碳新机制—微型生物碳泵(MCP)的提出,它解释了海洋中巨大溶解有机碳库存在的原因和机制,实现了海洋储碳机制理论上的新突破.

关键词：海洋微型生物好氧不产氧光合异养细菌时间序列红外荧光显微数字化技术微型生物碳泵海洋碳循环

同方期刊数据库

Observation of inhomogeneity in congruent liTaO3 crystal

在线全文

学校读者我要写书评

暂无评论

Beijing Synchrotron Radiation Facility 2001年第2期 142-144,页

作者： X.B.Hu H.D.Jiang H.liu S.S.Jiang q.li J.Y.Wang C.q.Zhang B.Ten BeijingSynchrotronRadiationLaboratory InstituteofHighEnergyBeijing100039210093People’sRepublicofChina NationalLaboratoryofSolidStateMicrostructures NanjingUniversityNanjing210093People’sRepubli

The inhomogeneity in a congrunet liTaO3 crystal has been observed by transmission synchrotron *** extraordinary regions exist in congruent liTaO3 crystal and they often show diffraction intensity different from that of ordinary regions in synchrotron *** thermal analysis indiates that the Curie temperature of the extraordinary region is lower than that of ordinary region,and the extraordinary region is really a high defect density *** diffraction contrast of the extraordinary region in synchrotron topographs is explained qualitatively by a calculation at the selected wavelength.2001 Published by Elsevier Science B.V.

关键词： liTaO3晶体钽酸锂晶体同步辐射形貌术结构分析 X射线分析

Effect of Substrate Bias on Microstructure and Properties of Tetrahedral Amorphous Carbon Films

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

Effect of Substrate Bias on Microstructure and Properties of...

基于术前甲状腺乳头状癌多模态超声的列线图预测中央区淋巴结转移

The Fourth International Conference on Physical and Numerical Simulation of Materials Processing (ICPNS’2004)

作者： J.q. ZHU, J.C. HAN, S.H. MENG, q. li and M.L. TAN Center of Composite Materials, Harbin Institute of Technology, Harbin 150001, China

The microstructure and properties of tetrahedral amorphous carbon (ta-C) films deposited by the filtered cathodic vacuum arc technology has been investigated by visible Raman spectroscopy, AFM and Nano-indentor. The Raman spectra have been fitted with a single skewed Lorentzian lineshape described by BWF function defining coupling coefficient, which characterizes the degree of asymmetry and is correlated with the sp3 content. When the substrate bias is -80 V, the sp3 content is the most and simultaneously the coupling coefficient is the least, following with the minimum root mean square surface roughness (Rq=0.23 nm) and the highest hardness (51.49 GPa), Young's modulus (512.39 GPa), and critical scratching load (11.72 mN). As the substrate bias is increased or decreased, the sp3 content and other properties lower correspondingly.

关键词： Tetrahedral amorphous carbon Filtered cathodic vacuum arc substrate bias

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

国际医学放射学杂志 2022年第5期 612-613页

作者： q.Dai D.M.liu Y.Tao C.Ding S.q.li C.Zhao 谢永生

摘要目的基于甲状腺乳头状癌和颈部淋巴结的术前临床和多模态超声特征构建列线图预测中央区淋巴结转移（CLNM）。方法该回顾性研究共纳入822例甲状腺乳头状癌

关键词：

The design and performance of charged particle detector onboard the GECAM mission

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Radiation Detection Technology and Methods 2022年第1期6卷 53-62页

作者： Y.B.Xu X.q.li X.L.Sun S.Yang H.Wang W.X.Peng X.H.liang K.Gong Y.q.liu D.Y.Guo X.Y.Zhao C.Y.li Z.H.An J.J.He X.J.liu X.Y.Wen S.L.Xiong Fan Zhang D.L.Zhang C.Y.Zhang C.Cai Z.Chang G.Chen C.Chen Y.Y.Du M.Gao R.Gao D.J.Hou Y.G.li G.li L.li X.F.li M.S.li F.J.Lu H.Lu B.Meng F.Shi J.Z.Wang Y.S.Wang H.Z.Wang X.Wen S.Xiao Y.P.Xu J.W.Yang q.B.Yi S.N.Zhang C.M.Zhang F.Zhang Y.Zhao X.Zhou Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China

Background The Gravitational wave highly energetic Electromagnetic Counterpart All-sky Monitor(GECAM)is dedicated to detecting gravitational wave gamma-ray *** is capable of all-sky monitoring over and discovering gamma-ray bursts and new radiation *** consists of two microsatellites,each equipped with 8 charged particle detectors(CPDs)and 25 gamma-ray detectors(GRDs).Purpose The CPD is used to measure charged particles in the space environment,monitor energy and flow intensity changes,and identify between gamma-ray bursts and space charged particle events in conjunction with *** CPD uses plastic scintillator as the sensitive material for detection,silicon photomultiplier array as the optically readable device,and the inlaid Am-241 radioactive source as the onboard calibration *** In this paper,we will present the working principle,physical design,functional implementation and preliminary performance test results of the *** a result,the energy range of electron,gamma-ray detection efficiency and dead time are tested to be better than the indexes required through the ground calibration experiment.

关键词： GECAM CPD SiPM

The data acquisition algorithm designed for the SiPM-based detectors of GECAM satellite

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

Radiation Detection Technology and Methods 2022年第1期6卷 70-77页

作者： Y.q.liu K.Gong X.q.li X.Y.Wen Z.H.An C.Cai Z.Chang G.Chen C.Chen Y.Y.Du M.Gao R.Gao D.Y.Guo J.J.He D.J.Hou Y.G.li C.Y.li G.li L.li X.F.li M.S.li X.H.liang X.J.liu F.J.Lu H.Lu B.Meng W.X.Peng F.Shi X.L.Sun H.Wang J.Z.Wang Y.S.Wang H.Z.Wang X.Wen S.Xiao S.L.Xiong Y.B.Xu Y.P.Xu S.Yang J.W.Yang q.B.Yi Fan Zhang D.L.Zhang S.N.Zhang C.Y.Zhang C.M.Zhang Fei Zhang X.Y.Zhao Y.Zhao X.Zhou Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100049China Physics and Space Science College China West Normal UniversityNanchong 637002China

Background The Gravitational Wave High-energy Electromagnetic Counterpart All-sky Monitor(GECAM)consists of 2 microsatellites,each of which contains 25 GRD(LaBr3)detectors and 8 CPD(plastic scintillator)*** silicon photomultiplier(SiPM)array is used to read each *** output signal of these detectors with SiPM array is very special and challenging to *** this study,a novel data acquisition(DAq)algorithm for these detectors is designed and implemented,and the content of the output event packet is *** and Conclusion The performances,including the event acquisition efficiency of this DAq algorithm,are extensively verified through experimental *** the on-ground and in-flight tests,this algorithm has excellent performance despite the very limited resources and short development time of GECAM mission.

关键词： Silicon photomultiplier Digital waveform processing Data acquisition

高能量饮食雌性运动大鼠脂肪组织瘦素mRNA的表达

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

中国组织工程研究与临床康复 2007年第17期11卷 3376-3378页

作者：柯小剑王人卫李擎上海体育学院运动科学系

目的:瘦素作为调节机体能量平衡的因子在生殖方面亦具有重要的调节作用,观察高能量饮食对雌性运动大鼠脂肪组织瘦素分泌的影响。方法:实验于2005-07/12在上海体育学院运动科学实验中心完成。选用32只SD雌性大鼠,随机(抽签法)分为4组,即... 详细信息

目的:瘦素作为调节机体能量平衡的因子在生殖方面亦具有重要的调节作用,观察高能量饮食对雌性运动大鼠脂肪组织瘦素分泌的影响。方法:实验于2005-07/12在上海体育学院运动科学实验中心完成。选用32只SD雌性大鼠,随机(抽签法)分为4组,即正常组、高能量饮食组、运动组、运动+高能量饮食组,每组8只。正常组:常规基础饲料膳食。高能量饮食组:高能量饲料膳食(每200g基础饲料中加入鸡蛋15g,食糖40g,猪油20g,浓鱼肝油10滴)。运动组:采用递增负荷运动。运动+高能量饮食组:采用递增负荷运动,同时膳食采用高能量饲料。各组大鼠膳食平均40g/(d·只)。除对照组外运动组均采用段氏PT-98型进行运动训练,先适应性进行训练5d,以后每周运动6d,休息1d,训练2次/d,上下午各1次,最后1d的晚上加训1次。负荷设定参考Bedford的动物运动负荷标准,1～6周跑台速度分别为15,20,27,32,35,35m/min,40min/次,坡度为0°。所有组均于4周后隔天行阴道脱落细胞学检查,保证大鼠于动情间期处死,各组交叉进行。观察高能量饮食对雌性运动大鼠的体质量、体内脂肪含量及脂肪组织的瘦素mRNA表达的影响。结果:32只大鼠均进入结果分析。①各组大鼠体质量、腹内脂肪质量的比较:经过高能量饲料喂养后,高能量饮食组的体质量、腹腔内脂肪湿质量及单位体质量脂肪明显高于正常组[(323.58±23.88),(281.01±12.67)g;(11.53±2.99),(6.01±2.10)g;(35.35±7.24)×103,(18.62±2.89)×103;P0.05)。②各组大鼠脂肪组织瘦素mRNA表达的比较:运动组与正常组相比脂肪组织中的瘦素mRNA表达水平明显下降(P0.05)。结论:高能量饮食能够改善运动所导致的雌性大鼠瘦素水平的下降,在一定程度上改善其能量平衡状况。

关键词：运动(Exercise) 瘦素体重食品配方