化

The reaction of polyfluoroalkyl iodides with 4-pentenoic acids initiated by sodium dithionite was realized to give polyfluoroalkyl substituted lactones.

我们研究了多氟烷基碘代烷与4-戊烯酸类化合物等在连二亚硫酸钠引发下的反应，得到了氟烷基取代的内酯化合物，我们将该反应称为氟烷基化内酯化反应；并建立了一个利用该反应合成含氟内酯的新方法，首次利用氟烷基化内酯化反应进行高立体选择性双环含氟内酯及手性含氟内酯等的合成，已合成含氟内酯新化合物50余种。

Results Over 90% of nasal and sinus cavity got clean within 1 to 2 weeks postoperatively. About 80% of patients had the De-mucous reaction from the 3rd to 10th week , such as mucous edema, vesicles, granulation tissue, mini-polyps, fibrous hyperplasia, and adhesion or regenerated diseases may appear in this stage. All of these diseases competed with mucous epithelization.

结果 90%以上的术腔在1～2周内清洁，80%以上的术腔在3～10周内有水肿、囊泡、肉芽、息肉生长和纤维结缔组织增生、粘连等去粘膜化反应或再生病变发生，并与上皮化呈竞争性生长。90%的术腔在经过恰当的处理后可完成上皮化，其中接近60%的术腔是在术后11～14周完成上皮化。

This article provided a new route to produce 4-dimethoxy phenethylamine. In basic condition, the product could be obtained through etherization, bromation, Grignard reaction, hydroxyethylation, esterification and Gabriel reaction with phenol as raw material, the overall yield is 45.0%.

提出了合成4-甲氧基苯乙胺的新方法，即在碱性条件下，苯酚首先与硫酸二甲酯反应，再选用高选择性的溴化剂溴化后，经格氏反应、羟乙基化反应和酯化反应，最后经Gabriel反应可以制备目标产物，反应总收率为45.0%。

It was shown that MFI/MFI core-shell zeolite with high Si/Al shell could be synthesized by using ethylamine rather than TPAOH as organic template under mild hydrothermal conditions.

考察了晶化温度和晶化时间对高硅壳层MFI/MFI核壳型沸石分子筛的合成的影响，其适宜的合成条件为晶化温度高于130 ℃，晶化时间19 h。

It proved that yellow-mutant belongs to the type of absence of chlorophyll; etiolation had relation to the lack of chlorophyll.The biology characteristic of the yellow-mutant cultured in vitro was investigated. The results showed that the mutant behaved etiolation character in different temperature and illumination time condition.

在离体培养条件下，探讨了桑树黄化突变体的生物学特性，发现在不同温度及光照条件下均表现黄化特征，证明该突变体叶色黄化与否与温度变化无关，不属于温敏型或光敏型叶色突变体，但突变体的黄化程度受温度影响而有一定的变化。

Results showed that the monochromatic lights were advantageous to the Pchlide reduction and biosynthesis for etiolation seedling of Phaseolus radiatus in illumination for 0.5 h at first. The monochromatic light did not favor for Chlide esterification after illumination for 2 h. Chlide esterification was controlled by the cell nucleus gene, because Chlide esterification rate was restrained to the seedling leaf of P. radiatus.

结果表明：绿豆黄化幼苗在光照最初0.5h，单色光有利于Pchlide的还原和新Pchlide的生物合成；光照2h后，单色光不利于Chlide的酯化；CH明显抑制绿豆幼苗子叶Chlide的酯化速度，说明Chlide的酯化是受细胞核基因控制。

Recently Wang and Xiao discussed the excitation state energy of polaron in polyatomic crystals for the first time.

近年来国内外对多原子极性晶体中磁极化子性质的研究十分活跃，Zorkani等采用变分法计算了束缚磁极化子的基态能量，Kandemir等采用束缚朗道态讨论了二维大磁极化子的基态和第一激发态能量，国内一些学者采用微扰法和新颖算符法讨论了多原子极性晶体中表面和体磁极化子的性质。

A Focus+Context technique based on circle packing is presented for interactive visualization of large hierarchical data. First, a triangular mesh generating method based on externally tangent circles packing is proposed to establish context.

综述了海量层次信息可视化与Focus+Context技术的相关工作，针对海量层次信息可视化的交互问题，在嵌套圆可视化技术的基础上提出了基于上下文感知的Focus+Context交互式可视化技术。

In this paper, six measures were suggested to meet above-mentioned points, namely, standardization of indications, routinization of pathogenetic diagnosis in infectious diseases, rationalization of drug selection in infectious diseases, institutionalization of surveillances and feedback of resistance information, individualization of medication in anti-infection treatment, and daily assessment of therapeutic value.

笔者提出"六化"，即做到用药适应证规范化，做到感染性疾病病原学诊断常规化，提倡感染性疾病病原学治疗选药合理化，逐步做到推广病原菌耐药性信息监测与反馈制度化，强调抗感染治疗用药方案个体化，评价疗效制度日常化。

According to the classifing method of Geldart,ultrafine powders belong to group C particles.It is difficult to fluidize because of such cohesiveness.However,it was discovered recently that some powders can be fluidized smoothly through forming larger agglomerates at high gas velocity,and the fluidization quality of some powders can be improved by external force.

按Geldart的分类法，超细粉属难流化的C类颗粒，但近年来的研究表明，某些超细粉在高气速下可以形成较大的聚团，而以聚团形式实现平稳流化；对在高气速下难以流化的超细粉，人们通过引入外力场等方法来改善其团聚特性，提高流化质量。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。