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Abstract: The allylation reactions of hydrates of α- keto aldehydes and glyoxylates by diallyltin dibromo were carried out in water to give α- keto and α- ester homoallylic alcohols in good to excellent yields.
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文摘:在水相中,α-羰基水合醛及水合醛酯与二溴二烯丙基锡作用可较高产率地生成α-羰基和α-酯基高烯丙基醇. |
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Abstract: The analysis and study on the false waste products in calculating the procedure dimension are made,and a practical method to judge the false waste products is proposed.
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文摘:对工序尺寸换算中的“假废品”问题进行了分析、研究，并提出了一种切实可行的判别假废品的方法。 |
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Abstract: The analysis of the mechanical and pneumatic control systems of scutcher machines is studied in this paper,a hydraulic control system with electro-hydraulic proportional valve to regulate the force imposed on the cotton lap is proposed.It can im
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文摘:在分析了机械式和气动成卷机成卷压力控制系统的基础上,提出了一种采用电液比例控制技术的成卷机控制系统.它不仅可以提高成卷质量,而且可以简化系统设计,降低成本,是一种有希望的成卷机成卷压力控制系统. |
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Abstract: The analysis technology of components quality and reliability growth was presented in this paper，in terms of failure information collection and analysis, failure analysis, destructive physical analysis, internal residual gas analysis of hermetic
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摘要：从元器件可靠性物理分析技术角度，系统地阐述了失效信息的收集与分析、失效分析、破坏性物理分析、密封器件内部气氛分析、失效模式及机理与工艺的相关性分析、失效模式与影响分析等元器件的质量与可靠性分析技术。 |
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Abstract: The anti-inflammatory effect of n-butanol extract of Xanthocerassorbifolia Bunge(BEX)was studied in this paper.The ear edema resulted from dimethyl benzene,paw edema induced by carrageenin,the increase of vascular permeability caused by acetic a
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文摘:文冠木正丁醇提取物对二甲苯致小鼠耳肿胀、蛋清致大鼠足肿胀、角叉菜胶致小鼠足肿胀、醋酸致小鼠腹腔毛细血管通透性增加、小鼠羧甲基纤维素囊中白细胞游走、小鼠棉球肉芽肿生长均有显著的抑制作用，同样剂量下，文冠木正丁醇提取物对角叉菜胶致去双侧肾上腺小鼠足肿胀仍有显著的抑制作用，且对小鼠肾上腺重量及肾上腺中维生素C的含量没有明显影响。 |
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Abstract: The anti-plane problem in transversely isotropic magnetoelectroelastic materials containing an elliptic inclusion is considered by using the complex variable approaches.The analytical expressions for the field variables in both the matrix and th
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文摘:用复变量方法研究了横观各向同性电磁弹性固体的反平面夹杂问题，得到了远场均匀应力和电磁场作用下夹杂内外弹性场和电磁场的解析表达式，结果表明夹杂内的应力、电位移和磁感应强度为常量。 |
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Abstract: The antioxidative effect, thermal stability and time stability of dilauryl thiodipropionate (DLTP) were studied. The synergistic effect of DLTP and phenolic antioxidatant was also discussed.
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文摘:研究了硫代二丙酸二月桂酯的抗氧化效果、它与酚类抗氧化剂的协同性及其热稳定性和时间稳定性。 |
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Abstract: The application and development of PLA-based biodegradable materials in organic synthesis, fine chemicals, medicine and surgery and environment protection are introduced. The synthetic process is described.
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文摘:阐述了生物可降解聚乳酸材料在有机合成、精细化工、医疗、环保等领域的应用及发展前景，同时介绍了聚乳酸的合成方法. |
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Abstract: The application and development of urban digital cartography are discussed with urban 1∶500 digital areo-photogrammetry.
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文摘:本文基于实际应用,结合城市航测1∶500大比例尺数字化地形图的实践,讨论了城市数字化制图的应用及发展前景。 |
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Abstract: The application of genetic algorithm in optimun design is introduced and an optimum design is made of the combination feeding mechanism in automatic backaging machine.
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文摘:介绍了遗传算法在优化设计中的应用，并利用其对自动包装机组合推料机构进行了优化设计。 |
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Abstract: The application of high-strain dynamic tentative piling technique to determining limited bearing capacity of pile endpoint soil is a good method in the field of dynamic depth detection.
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文摘:应用高应变动力试桩法确定桩端土的极限承载力是动力触探领域中的一种好方法。 |
