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Amino-6-nitrobenzodifuroxan was prepared through a three-step reaction from starting material 3, 5-dinitrobenzoic acid:(1)3, 5-dinitroaniline (1) was synthesized from the reaction of DNBA and hydrazoic acid in inert solvent 1, 2-dichioroethane through Schmidt rearrangement with yield of 89.6%;(2) 1 was subjected to nitration to prepare pentanitroaniline (2) with yield of 51.1%;(3) The title compound was prepared from 2 and sodium azide in acetic acid through denitrogenation and then Schmidt rearrangement with yield of 86.8%, m.p.204℃~206℃.

以3,5-二硝基苯甲酸为原料经过3步反应合成了7-氨基6-硝基苯并二氧化吠咱:第1步反应,在二氯乙烷惰性溶剂中,DNBA与叠氮酸反应并发生Schmidt重排反应生成3,5-二硝基苯胺(1),产率89.6%;第2步反应,1在含100%硫酸的硝硫混酸中硝化生成五硝基苯胺(2),产率51.1%;第3步反应,2与叠氮酸反应,不经分离直接进行热解脱氮、Schmidt重排反应,得到目标化合物, m.p.204℃~ 206℃,产率86.8%。

It can decrease friction coefficient and improve the thermal stability, corrosion resistance, inadhesion and lubricity of basic materials.

基材视具体情况添加后,能降低摩擦系数,改善摩擦性能。对提供基础材料的热稳定性,耐腐蚀性,不粘性和润滑性有良好效果。

Traditional block has the construction requirements of constructional column, tensile inarch bar, castinplace concrete ring beam, and it is diffic ul t for construction and to assure the construction quality, moreover, the period is long. However, the core column and beam of new concrete hollow block with mac roporous lightweight aggregate adopt Ushape block to instead of traditional te c hniques. This technology reduces the process of formwork and binding reinforceme nt, and has the characteristics of convenient operation, rapid construction spee d, strong crack resistance, lower cost, and good insulation properties, and so o n.

摘要] 传统的砌块有构造柱、拉结筋、现浇混凝土圈梁等施工要求,施工难度大、施工工期长、且施工质量不容易得到保证;新型材料大孔轻集料混凝土空心砌块芯柱以及芯梁采用 U形砌块代替传统工艺要求,减少了支模、绑扎钢筋等工序,还具有使用方便,施工速度快,抗裂性强、节约成本、保温绝热性能好等施工优点。

Moissanite is NOT as heat sensitive as most gemstones.

碳硅石是因为大多数的宝石热不敏感。

Calculations show that effects of film evaporation can be neglectable and the temperature field of liquid film can not be approximated to linear distribution.

数值计算结果确认了液膜蒸发量对换热系数的影响可以忽略,液膜内温度分布不能近似为线性分布。

In order to develop the higher temperature electrolyte materials, many attempts have, so far, been made by modifying the Nafion membrane with various nonconductive inorganic materials.

虽然这种复合材料很容易合成出来并且已经运用到了实际工业应用之中,但是这种热稳定性提高的原因却不甚清楚。

The law requires that the courses be taught "in an objective and nondevotional manner with no attempt made to indoctrinate students."

州教育厅直到二月份才起草该课程,法律要求&客观地,不带灌输目的的非热狂地&讲授该课程。

Here, we report a case of acute Q fever complicated with mild jaundice and pleuritis. He did not respond well to doxycycline or levofloxacin initially, but recovered subsequently with adjuvant steroid therapy.

在此报告一例急性Q热合并黄疸及肋膜炎的个案,病患住院接受doxycycline及levofloxacin治疗但反应不佳,合并类固醇治疗后痊愈。

Here, we report a case of acute Q fever complicated with mild jaundice and pleuritis. He did not respond well to doxycycline or levofloxacin initially, but recovered subsequently with adjuvant steroid therapy.

在此报告一例急性Q热合併黄疸及肋膜炎的个案,病患住院接受doxycycline及levofloxacin治疗但反应不佳,合併类固醇治疗后痊癒。

The ore fluid has a temperature range of 150|300℃, probably derived from intermediate|acid albite porphyritic dikes, but not typically of magmatic hydrothermal origin. The ore fluid seems to be of multi|source.

成矿流体很可能来源于中酸性钠长斑岩脉,但又不是典型的岩浆热液,具有多成因性。

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This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。

There is no differences of cell proliferation vitality between labeled and unlabeled NSCs.

双标记神经干细胞的增殖、分化活力与未标记神经干细胞相比无改变。