对伞花烃

Methoxy sec-ethyl acetate, Ethyl acetate, Ethyl forate,α-Pinene,β-Pinene, Camphene, Junipene, Limonene, P-Cymene, Linalool and Terpinole are regarded as the key flavorous components, which result in the peculiar smell and taste in fruits of Rubus L..

综合分析表明，甲氧基次乙基乙酸酯、乙酸乙酯、甲酸乙酯、α-蒎烯、β-蒎烯、莰烯及桧烯、柠檬烯、对伞花烃、芳樟醇、萜品醇类等化合物是四种悬钩子类果实的主要香味成分。

1 M packed with Mellapak SM-250 under vacuum in batch process to obtain fractions rich in such components as pinenes, camphene, limonene as well as p-cymene, terpenol s, respectively.

松轻油先用碱液进行预处理，再用工业SM-250型孔板波纹填料塔(300mm、高10.1m)，以真空间歇操作方式进行一次性精馏分离，分别得到富含蒎烯、莰烯、苧烯及对-伞花烃、萜烯醇等的馏分。

By means of GC, GC-MS, GC-IR, the reaction products were investigated and the results showed that there are triylene, camphene, limonene, p-cymene, terpinolene -terpinene,-terpinene,-fenchyl formate, linalyl formate, terpinyl formate, bornyl formate and isobornyl formate containing in the products,and linalyl formate was first discovered in addition reaction of a -pinene and formic acid .The content of the main product terpinyl formate is up to 60.4%,the selectivity is 64.5%.

采用GC、GC-IR、GC-MS等对反应产物进行定量和定性分析，结果表明：微波辐射下α-蒎烯与甲酸的反应产物含有三环烯、莰烯、对-伞花烃、α-松油烯、γ-松油烯、柠檬烯、异松油烯、甲酸葑醇酯、甲酸异龙脑酯、甲酸龙脑酯、甲酸芳樟酯、甲酸松油酯。

13 K,α-pinene+ p -cymene (429. 05—447. 15 K),β-pinene+ p -cymene (439. 20—448. 66 K) and α-pinene+β-pinene+ p -cymene (432. 17—448. 11 K) were determined at atmospheric pressure (100. 7 kPa) with the modified Ellis still. The thermodynamic consistency of the experimental data was confirmed by means of the Herington method.

采用改进的Ellis平衡釜测定了在常压(100.7 kPa)下三个二元物系α-蒎烯＋β-蒎烯(428.82 K ~ 438.13 K)，α-蒎烯＋对伞花烃(429.05 K ~ 447.15 K)，β-蒎烯＋对伞花烃(439.20 K ~ 448.66 K)和一个三元物系α-蒎烯＋β-蒎烯＋对伞花烃(432.17 K ~ 448.11 K)的汽液相平衡数据，并利用Herington规则，以积分检验法对实验数据进行了热力学一致性检验。

Using turpentine from pine gum itself as solvent,catalytic disproportionations of P.

以Pd/C为催化剂、马尾松和湿地松松脂为原料并利用其自身所含松节油作溶剂进行催化歧化反应制备歧化松香和对-伞花烃的研究。

The major components of thymus essential oil were thymol and p-cymene, and it exhibited higher antibacterial activity against Escherichia coli and Staphylococcus aureus.

百里香精油主要成分是百里香酚和对伞花烃，其对大肠杆菌和金黄色葡萄球菌具有较强的抗菌活性。

Results:23 components of thymus essential oil were separated and 9 of them were identified, the main constituents were thymol (44.36%) and p-cymene (31.04%); the diameters of inhibition zones of essential oil towards Escherichia coli and Staphylococcus aureus were 32 mm±0.5 mm and 40.5 mm±1.0 mm.

结果：百里香精油共分离出23个峰，鉴定出其中9种化学成分，主要是百里香酚(44.36%)和对伞花烃(31.04%)；百里香精油对大肠杆菌和金黄色葡萄球菌的抑菌直径分别是32mm±0.5mm和40.5mm±1.0mm。

The main downstream products from the industrial dipentene were reviewed,such as:some kinds of polyester,fine chemical intermediates such as p-cymene,p-menthane and flavours such as carvone ,terpinyl acetate and so forth,the main characteristics and applications were also described in the paper.

综述了工业双戊烯主要的下游产品聚酯树脂、精细化工中间体如对伞花烃、对孟烷以及香料如香芹酮，乙酸松油酯等的合成方法及反应条件，介绍了相应产品的主要性质、用途。

From comparative research of synchronous and asynchronous reaction of dehydrogenation and cracking of dipentene,it is shown that farraginous extent of by-products from synchronous reaction is relatively high.

双戊烯脱氢裂解的同步反应和异步反应对比研究显示，双戊烯脱氢裂解的同步反应产物比较混杂，反应产物中甲苯的相对含量仅为24.03%，双戊烯相对于甲苯的料耗比为5.34，甲苯的得率为30.79%，中间产物对伞花烃的得率为2.49%；双戊烯脱氢裂解的异步反应产物混杂程度相对较低，反应产物中甲苯的相对含量为40.74%，对伞花烃的相对含量为18.31%，双戊烯相对于甲苯的料耗比为3.33，甲苯的得率为49.26%，中间产物对伞花烃的得率为16.92%。

At the same temperatures, the excess enthalpies of α-pinene+p-cymene system were larger than that of β-pinene+p-cymene.

相同温度下，α-蒎烯＋对伞花烃体系的超额焓比β-蒎烯＋对伞花烃体系的大。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。