季相

Macroporous tributyl amine aminating strongly basic anion exchange resin-a phase transfer catalyst with high catalytic activity for nucleophilic substitution,which was screened out via combinatorial chemistry method –was used to catalyze the nucleophilic substitution reactions for synthesis of benzyl acetate,benzyl propionate,benzyl butyrate and benzyl valerate.

用组合化学方法筛选出的对无外加碱条件下的亲核取代催化活性最高的聚合物季铵盐–三丁胺胺化强碱性阴离子交换树脂为相转移催化剂，催化合成了乙酸苄酯、丙酸苄酯、丁酸苄酯、戊酸苄酯等羧酸苄酯。

Remember to take vermicide during the spring and the fall.you and Sangwoo and the dog too.

"春夏两季别忘了吃倒虫丸儿，你，相宇，还有小狗，都要吃。"

Using the static chamber and Chromatograph method, H2S and COS emission from the marsh meadow Calamagrostis angustifolia and typical meadow Calamagrostis angustifolia were measured during growth season (5-9 month). the results showed that the seasonal and diurnal variations of H2S and COS emission were both obvious, the mean emission of H2S and COS from the marsh meadow Calamagrostis angustifolia were 0.34μg?

利用静态箱／气相色谱法，观测了小叶章沼泽化草甸和小叶章典型草甸两种湿地类型中H2S和COS在生长季（5-9月）的释放动态，结果表明：在两种小叶章湿地中，H2S和COS的排放通量均具有明显的季节和日变化规律。

N2O emission fluxes were measured using the technique of closed opaque chamber and gas chromatography system,in a field experiment carried out during three growing seasons in 2003-2005 on a tract of Calamagrostis angustifolia meadow and Carex lasiocarpa marsh.

利用静态暗箱/气相色谱法连续3个生长季(2003—2005年)对三江平原小叶章草甸和毛果苔草沼泽N2O排放通量进行野外对比观测试验。

Cycloalkylation of diethyl malonate and ethyl cyanoacetate with alkyl halide was investigated in the presence of toluene.

以甲苯为溶剂及带水剂，用粉末K2CO3代替常规使用的乙醇钠，在季铵盐和聚乙二醇混合相转移催化剂的存在下，含有活泼氢的丙二酸二乙酯和氰乙酸乙酯与二卤代物进行缩合反应，得到相应的环化物。

By the field survey which lasting a period of 3 grown seasons and by the means of remote sense and geographic information system, we ascertain the present vegetation pattern of Hunshan-Dake sand land, find out vegetation distribution principles on the different scales in the same time . From west to east, with the increasing of dry degree, the type of plant community changed form the xeric to the mesic. The vegetation of Sand land shows the characteristic of the zonal vegetation, but dont consistent with the traditional diversification principle. The vegetation of the middle part displays a high differential characteristic, which compresses the longitudinal zonation at a certain extent. So we can say that sand land vegetation is semi-zonal.

通过对浑善达克沙地历时三个生长季的地面考察并应用遥感及地理信息系统等手段，确定了浑善达克沙地植被分布现状及浑善达克沙地植被在不同尺度下的分异规律：由西向东，沙地植被随着干燥度的降低，由旱生群落为主的区段递变为以中生群落为主的区段，表现出具有一定的地带性植被特征，但与传统的地带性植被的递变规律不相一致，沙地中段的植被表现出了高度的特异性，在一定程度上压缩了植被的经向地带性，表现出沙地特有的地带性分布规律，所以认为沙地植被是一种半地带性植被。

Objective:An ionpair RPHPLC method was established to determine the amounts of lotusine, liensinine, isoliensinine and neferine in Plumula Nelumbinisimultaneously.

目的：建立同时测定莲子心中四种异喹啉生物碱莲心季铵碱、莲心碱、异莲心碱、甲基莲心碱含量的离子对反相高效液相色谱法。

The enhancement of the reaction activity is attributed to the phasetransfer capability of the built-in quaternary ammonium and pyridinium salts of theMn catalyst.

分子内季铵盐和吡啶盐具有相转移能力，对于取代色烯不对称环氧化的作用与外加的吡啶盐和卤化铵的作用相似，使Mn催化剂催化取代色烯环氧化反应的活性明显提高。

The enhancement of the reaction activity is attributed to the phasetransfer capability of the built-in quaternary ammonium and pyridinium salts of theMn catalyst. The effect of the internal quaternary ammonium and/or pyridiniumsalt on the epoxidation of substituted chromenes is similar to that of the externalpyridinium salts and ammonium halides.

分子内季铵盐和吡啶盐具有相转移能力，对于取代色烯不对称环氧化的作用与外加的吡啶盐和卤化铵的作用相似，使Mn催化剂催化取代色烯环氧化反应的活性明显提高。

Through analyzing the multi-temporal features of MODIS/NDVI in the growing season of wheat in Anhui Province and recognizing forest land, townish residential area, upland field, paddy field and woodland by using this technique, its application in ground-object identification and prediction of crop yield was studied.

方法］通过分析安徽省小麦生长季MODIS多时相NDVI特征并利用该技术识别水体、城镇居民区、旱地、水田、林地研究了该技术在地物识别及农作物产量预报中的应用。

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。