共查询到20条相似文献,搜索用时 48 毫秒
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"爱是打开学生心灵的钥匙。"这是每一位教师都深知的道理,已从事教书十二个年头的我,深深地体会到"爱一个人就等于塑造一个人,没有爱,就没有教育。"在教育教学工作中,我树立的信条是:"既不娇宠春风得意的学生,也不怠慢暂时落后的学生”。以“假如我是孩子”和“假如是我的孩子”来看待学生,关心爱护学生,对待学习困难的学生从不厌弃,而是耐心地帮助,循循善诱;对生活困难的学生,给他们无限的关爱,甚至解囊相助;对待单亲家庭的学生,给予他们感情上的温暖,使学生体会到家的温暖。 相似文献
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安全检查是消除隐患、防止事故发生、改善安全状况的重要手段。通过日常安全检查,可以发现生产过程中各种不安全因素,便于及时制定制度纠正错误,杜绝各种事故隐患,保证安全生 相似文献
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智慧城市的4个原则 从广义上来说,智慧城市建设第一要以人为基础,这就要求城市首先要有人气,因此目前智慧城市的重点应该是中心城市、大城市,同时市民的整体素质要高,要有适宜的人居环境,包括良好的文化和公共服务、便捷的交通服务,生活成本要合理,城市的管理也要良好;第二要以土地为载体,这就要求城市不能无限扩张,要在保障容积率的情况下合理利用现有空间,要合理布局工作、生活、休闲区域,同时提供更好的公共交通服务;第三要以信息技术为先导,就需要掌握真实、全面、准确、及时的信息,要有开放的系统实现信息共享,要让人民群众成为最大的受益者;第四要以资本为后盾,就是要逐渐从产业资本出发,转向商业资本,进一步转向金融资本,为智慧城市的发展提供坚强的资本后盾。 相似文献
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Kinetic parameters of oscillating reaction of amino acid- BrO3^——Mn^2+-H2SO4-acetone system 总被引:2,自引:0,他引:2
LIZongxiao YUANChunlan NIEFei 《科学通报(英文版)》2005,50(1):15-20
In the previous papers[1—3], the oscillating reactionusing amino acids as organic substrates was studied. Inorder to obtain information about the kinetic parameters ofoscillating reaction of amino acids in amino acid- BrO3 - ?Mn2 -H2SO4-acetone sy… 相似文献
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根据密封舱改性渣土的三轴压缩实验数据,建立了基于优化方法的Duncan-Chang双曲线本构模型参数反演方法。为了解决参数识别反问题解的不稳定性问题,在Gauss-Newton优化迭代算法的基础上,提出了正则化参数反演方法。实际应用结果表明,所提出的反演方法具有较快的收敛速度和较强的鲁棒性,预测的实验模型变形与实验值吻合较好。 相似文献
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MA JingJing LI LiangBi JING YuXiang KUANG TingYun 《科学通报(英文版)》2007,52(7):896-902
In order to study the functions of cytochrome b559 (Cyt b559) in photosystem two (PSII) activity, mutant S24F of Chlamydomonas reinhardtii was constructed using site directed mutagenesis, in which Serine24 (Ser24) locating downstream of Histidine23 (His23) in α subunit of Cyt b559 was replaced by Phenylalanine (Phe). Physiological and biochemical analysis showed that mutant S24F could be grown photoautotrophically or photoheterotrophically. However, their growth rate was slower either on HSM or TAP medium than that of the control; Analysis of PSII activity revealed that its oxygen evolution was about 71% of wild type (WT); The Photochemical efficiency of PSII (Fv/Fm) of S24F was reduced 0.23 compared with WT; S24F was more sensitive to strong light irradiance than the wild type; Furthermore, SDS-PAGE and Western-blotting analysis indicated that the expression levels of α subunit of Cyt b559, LHCII and PsbO of S24F were a little less than those of the wild type. Overall, these data suggests that Ser24 plays a significant role in making Cyt b559 structure maintain PSII complex activity of oxygen evolution although it is not directly bound to heme group. 相似文献
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Guo-qiang Liu Xi Wang Ya-jie Gao Lei Wen Guang-yin Liu Jian-jie Zheng Peng Cen Ying Li 《矿物冶金与材料学报》2012,19(5):457-460
Spinel compounds LiNi0.5Mn1.3Ti0.2O4 (LNMTO) and Li4Ti5O12 (LTO) were synthesized by different methods. The particle sizes of LNMTO and LTO are 0.5–2 and 0.5–0.8 μm, respectively.
The LNMTO/LTO cell exhibits better electrochemical properties at both a low current rate of 0.2C and a high current rate of
1C. When the specific capacity was determined based on the mass of the LNMTO cathode, the LNMTO/LTO cell delivered 137 mA·h·g−1 at 0.2C and 118.2 mA·h·g−1 at 1C, and the corresponding capacity retentions after 30 cycles are 88.5% and 92.4%, respectively. 相似文献
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Preparation of Al<Subscript>72</Subscript>Ni<Subscript>8</Subscript>Ti<Subscript>8</Subscript>Zr<Subscript>6</Subscript>Nb<Subscript>3</Subscript>Y<Subscript>3</Subscript> amorphous powders and bulk materials
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Amorphous Al72Ni8Ti8Zr6Nb3Y3 powders were successfully fabricated by mechanical alloying. The microstructure, glass-forming ability, and crystallization behavior of amorphous Al72Ni8Ti8Zr6Nb3Y3 powders were investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), and differential scanning calorimetry (DSC). The isothermal crystallization kinetics was analyzed by the Johnson–Mehl–Avrami equation. In the results, the supercooled liquid region of the amorphous alloy is as high as 81 K, as determined by non-isothermal DSC curves. The activation energy for crystallization is as high as 312.6 kJ·mol?1 obtained by Kissinger and Ozawa analyses. The values of Avrami exponent (n) imply that the crystallization is dominated by interface-controlled three-dimensional growth in the early stage and the end stage and by diffusion-controlled two- or three-dimensional growth in the middle stage. In addition, the amorphous Al72Ni8Ti8Zr6Nb3Y3 powders were sintered under 2 GPa at temperatures of 673 K and 723 K. The results show that the Vickers hardness of the compacted powders is as high as Hv 1215. 相似文献
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WANG Xiuying YANG Chao FAN Changzeng LIU Riping SUN Liling ZHANG Jun ZHAN Zaiji WANG Wenkui Key Lab of Metastable Materials Science & Technology Yanshan University Qinhuangdao China Institute of Physics Chinese Academy of Sciences Beijing China Harbin Institute of Technology Harbin China Correspondence should be addressed to Wang Xiuying 《科学通报(英文版)》2004,49(10):999-1001
Effects of proton irradiation on structure re-laxation of Zr_(41.5)Ti_(14.9)Cu_(12.6)Ni_(10.5)Be_(20.4) bulk metallic glass areinvestigated by means of X-ray diffraction, differential scan-ning calorimetric and electronic resistance measurements.The results show that, at 203 K, the structure ofZr_(41.5)Ti_(14.9)Cu_(12.6)Ni_(10.5)Be_(20.4) bulk metal glass is relaxed obvi-ously by proton irradiation with the energy and the dosebeing of 160 keV and 1.65×10~(16) ions/cm~2, respectively. How-ever, Zr_(41 .5)Ti_(14.9)Cu_(12.6)Ni_(10.5)Be_(20.4) bulk metallic glass becomesmore steady amorphous state under two conditions, one isthat the energy and the dose are 160 keV and 1.1×10~(15)ions/cm~2, respectively. Another is that the energy and thedose are 120 keV and 6.5×10~(15) ions/cm~2, respectively. 相似文献
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ZHANG Jie CHEN Jian WU JingBo KANG Lin XU WeiWei WU PeiHeng 《科学通报(英文版)》2007,52(3):303-306
We adopted a new method, acid etching process, to fabricate the intrinsic Josephson junctions based on the Bi2Sr2CaCu2O8 x single crystals. By soaking the crystals into the dilute hydrochloric acid, we fabricated a junction stack successfully, and meantime made the surrounding area insulated. A certain concentration of hydrochloric acid was used to maintain the roughness of the modified layer. The cur-rent-voltage characteristic was achieved through the four terminal measurement. We could control the junctions' number by changing the concentration and the soaking time. We also found that the thick-ness of the stack was equal to the average height of the insulation layer. Such a simple, convenient and controllable fabrication method with a high yield might widen the applications of the intrinsic Joseph-son junctions. 相似文献
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The electro-deoxidation of V2O3 precursors was studied. Experiments were carried out with a two-terminal electrochemical cell, which was comprised of a molten
electrolyte of CaCl2 and NaCl with additions of CaO, a cathode of compact V2O3, and a graphite anode under the potential of 3.0 V at 1173 K. The phase constitution and composition as well as the morphology
of the samples were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM). 3 g of V2O3 could be converted to vanadium metal powder within the processing time of 8 h. The kinetic pathway was investigated by analyzing
the product phase in samples prepared at different reduction stages. CaO added in the reduction path of V2O3 formed the intermediate product CaV2O4. 相似文献
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XianYong Lu Mu Niu ChunHui Yang LuoXin Yi RuiRui Qiao MeiHong Du MingYuan Gao 《科学通报(英文版)》2010,55(30):3472-3478
Novel poly(N-vinyl-2-pyrrolidone) (PVP)-coated nickel ferrite nanocrystals were prepared by simultaneously pyrolyzing nickel(II) acetylacetonate (Ni(acac)2) and iron(III) acetylacetonate (Fe(acac)3) in N-vinyl-2-pyrrolidone (NVP). The PVP coating was formed in situ through polymerization of NVP. The crystalline structure of the resultant nickel ferrite was analyzed by high-resolution transmission electron microscopy, electron diffraction patterns, and powder X-ray diffraction. In addition, the valence state of Ni and the metal contents of Ni and Fe in different valence states were analyzed by X-ray photoelectron spectroscopy (XPS), atomic absorption and the phenanthroline method. The surface coating layer of PVP and its binding states were characterized by Fourier transform infrared spectroscopy in combination with XPS. Colloidal stability experiments revealed that the nanocrystals could be dispersed well in both phosphate-buffered saline and Dulbecco’s Modified Eagle Medium. 相似文献
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QU Xiaosheng LI Jie WANG Zhiyong WANG Cunxin 《武汉大学学报:自然科学英文版》2007,12(3):511-514
A coordination complex was synthesized from NiCl2 and dipeptide glycylglycine(GG). It was characterized by element analysis, NMR and TG methods, and then was determined to be Ni(C4HsN2O3)2Cl2. Using an isoperibolic reaction calorimeter, the standard molar enthalpy of formation of Ni(GG)2Cl2(solid) has been determined to be -(1 674.66±2.02) kJ · mol^-1 at 298.15 K. 相似文献