共查询到20条相似文献,搜索用时 78 毫秒
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张文德 《分析测试技术与仪器》2000,6(4):245-247
熟悉了解仪器的总体结构性能,剖析零部件的功能,注重基础研究,弄清仪器的安全联锁保护是提高仪器使用与维修水平的关键;重视仪器的故障分析与判断、准确及地维修、合理地使用保养是保持仪器良好运行状态的唯一手段;建立仪器档案,定期进行性能测试是了解仪器,把握仪器运行脉搏、充分利用仪器的前提。 相似文献
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科学进步离不开科研仪器技术的发展, 科研仪器自主研制已成为我国促进技术创新的强劲动力和人才培养的重要平台. 飞船发射、航母制造、北斗导航等高科技重大突破离不开我国自行研制的高端科研仪器, 科技创新已成为当今各国提高综合国力的战略支撑. 每年我国对科研仪器的市场需求很大, 但进口仪器占比70%, 部分高端仪器更是100%依赖进口. 由于高、精、尖科研仪器的核心技术、关键零部件被国外封锁, 导致我国研发的高端科研仪器丧失国际竞争力. 针对上述现象, 通过对国产科研仪器目前现状分析, 就如何加强国家创新引导力来加快推进国产科研仪器高质量发展, 从而提升在国际市场的竞争力, 最终实现"进口替代"进行探讨. 相似文献
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薛青松 《分析测试技术与仪器》2021,27(3):228-231
以一线管理人员切身体会及精密贵重仪器的自身特点出发,提出了以机为本的精密贵重仪器的全新管理模式,即以精密贵重仪器为根本或标的,以最小化的维护运行成本,实现全年全天候全方位的高效开放,充分发挥出精密贵重仪器本身应有的价值.并提出把仪器管理的好坏作为考核仪器管理人员最重要的指标,从而提高管理人员的主观能动性,实现精密贵重仪器的高效管理,为科教兴国、建设创新型国家做贡献. 相似文献
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HEPT类化合物的QSAR研究 总被引:3,自引:0,他引:3
为定量结构/活性相关性研究提取了量子化学参数,拓扑指数Am,分子连接性指数^mxt及疏水性常数,同时应用正交变换和最佳变量子集算法(Leaps-and-Bonds)进行了变量压缩和选择,进而实施了多元回归分析,并由此结果进行了HEPT类化合物(1-[(2-hydroxyethoxy)methyl]-6-(phenylthio)-thymine derivatives)的结构/活性关系的理论解释,进行了人工神经网络法对于该类化合物的活性预测,其结构明显好于多元回归法。 相似文献
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Emma Hocker 《Macromolecular Symposia》2006,238(1):16-21
Sweden's famous warship, Vasa, sank on her maiden voyage in August 1628, and remained on the bottom of Stockholm harbour for 333 years. Raised in 1961, she became the first large-scale wooden object to be treated with polyethylene glycol (PEG). In the summer of 2000 a number of acidic salt precipitations were noticed on the surface of the ship and on wooden artefacts in the storerooms. An international research project has been established to look into the causes of this problem and suggest possible re-treatments. Meanwhile projects are underway to monitor movements in the ship, to build a better support system, and to replace the thousands of iron bolts holding the structure together, while a sophisticated new climate system has recently been installed in the museum. 相似文献
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通过在LS55型荧光-磷光-发光分光光度计上加装液滴产生及调节附件,采用计算机采集与分析处理数据,成功地研制了双通道液滴光化学传感装置.利用葡聚糖凝胶对复合维生素B中不同组分的选择性吸附来达到分离与同时检测的目的,并将其用于复合维生素B药片的分析,取得了满意的结果. 相似文献
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《Physics and Chemistry of Liquids》2012,50(5):671-677
Similarity of the extrusion curves of non-wetting liquid in a nanoporous medium with different initial fill volume fractions is observed experimentally. The similarity can be explained by the scaling of the interface energy and the self-similarity of the infinite percolation cluster of fluid-filled pores. Understanding the physical processes leading to the observed phenomena is a foundation for the development of high-performance devices for damping and energy storage on the basis of such heterogeneous systems. 相似文献
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David Briers Lieven De Cremer Guy Koeckelberghs Stijn Foerier Thierry Verbiest Celest Samyn 《Macromolecular rapid communications》2007,28(8):942-947
A new chromophore, C1 , based on a similar DπA‐structure as in the FTC ‐chromophore but with a hydroxyalkyl spacer perpendicular to the direction of the dipole moment was synthesized. Both chromophores and the CLD ‐chromophore were used to prepare high Tg nonlinear optical vinyl polymers. The influence of the position of the spacer on the DπA‐system on the NLO response of the resulting polymers was investigated.
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A. D. Alexadrov 《Colloid and polymer science》1994,272(2):181-183
The dependence of the critical supersaturation on the degree of the initial undersaturation has been analyzed in detail.This dependence is explained by means of the Richarch-Powell equation, taking into account the dependence of the -ratio upon the partial pressures of the inert gas and the liquid under investigation. 相似文献
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Bjørn Voigt 《Theoretical chemistry accounts》1973,31(4):289-295
A series of approximate LCAO-SCF methods intermediate between the INDO and the NDDO schemes is proposed. The suggestion is based upon the decomposition of integrals in multipole-multipole type interactions. 相似文献
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The content of the fine and ultrafine particles in the raw material results in difficulty of the separation, the loss of the valuable components and ecological contamination. Secondary using of the fine particles is impossible without their granulation. This problem has been solved by the agglomeration-in-liquid method.An agglomeration-in-liquid method is a process to produce agglomerates in a liquid phase from solid particles suspended in the liquid. The surface of solid particles and the binding liquid must be of identical polarity, but the continuous phase must be of the opposite polarity. The water solutions of the surfactant are the binding liquids or the organic liquids. 相似文献