摘要：A post-synthetic modification strategy has been used to prepare three solid base catalysts, including Er（btc）（ED）075（H2O）0.25 （2, btc = 1,3,5-benzenetricarboxylates, ED = 1,2-ethanediamine）, Er（btc）（PP）0.55（H20）0.45 （3, PP = piperazine）, and Er（btc）（DABCO）0.15（H2O）0.85 （4, DABCO = 1,4- diazabicyclo[2.2.2]octane）, by grafting three different diamines onto the coordinatively unsaturated Er（III） ions into the channels of the desolvated lanthanide metal-organic framework （Er（otc））. The resulting metal-organic frameworks were characterized by elemental analysis, thermogravimetric analysis, powder X-ray diffraction, and N2 adsorption. Based on its higher loading ratio of the diamine, as well as its greater stability and porosity, catalyst 2 exhibited higher catalytic activity and reusability than catalysts 3 and 4- for the Knoevenagel condensation reaction. The catalytic mechanism of 2 has also been investigated using size-selective catalysis tests.

摘要：为研究中药地黄根圈土壤拮抗性放线菌在植物病害生物防治中的应用潜力,用常规方法从地黄根圈土壤中分离获得42株放线菌。采用琼脂块法进行初筛,用纸片扩散法和生长速率法对抑菌效果最好的菌株DHR11进行抑菌活性复筛,通过形态、培养特征及16S rDNA序列分析研究其分类地位,并采用正交设计对从6种培养基中筛选的最佳培养基进行优化。结果表明:4株放线菌对供试植物病原真菌有较好的拮抗作用,其中菌株DHR11对苹果炭疽病菌Colletotrichum gloeospori-oides的抑菌活性最高,抑菌圈直径达30mm,抑菌率达52.5%;菌株DHR11发酵9天时抑菌活性最高;最优培养基组成为:蔗糖15 g、可溶性淀粉25 g、大豆粉10 g、酵母膏7.5 g、K2HPO40.5 g、自来水1000 mL;最佳发酵条件为:培养基初始pH7.5,接种量15%(v/v),摇床转数220 r/min,装瓶量80mL/250 mL,28℃发酵9天。根据形态、培养特征及16S rDNA序列分析,初步鉴定DHR11为加利利链霉菌Streptomyces galilaeus。

摘要：某地下室工程基础形式采用天然基础加防水板。在基础施工过程中发现局部邻近基坑边处地基为软弱土层且厚度较厚,与地质勘察报告揭露的情况相差较大。在本工程工期紧张,工程预算有限的情况下为解决场地内持力层分布与地质勘察报告不符的意外情况,专门进行了地基和基础处理方案分析。通过比较表明了静压锚杆桩在处理上述应急问题上的优势。此外,通过该工程案例介绍了了静压锚杆桩的单桩设计、桩位布置、构件连接等设计要点,表明了该桩在处理此类问题上具有较好的效果,为类似工程问题提供一定参考。

摘要：软件越来越不能承受它自身的复杂性。什么是Charles Simonyi的解决方案?他要让编程工具变得那么简单，以致于非专业编程人员也能使用它．

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