共查询到20条相似文献,搜索用时 140 毫秒
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2004年9月,冬小麦秋种期间,拜耳将谷物除草剂Olympus(丙苯磺隆70%)引入美国。丙苯磺隆已于6月30日获得EPA批准,这是继年初甲磺胺磺隆获得批准后,拜耳2004年在美国登记的第二个谷物除草剂。 相似文献
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环丙嘧磺隆(Cyclosulfamuron)是一种新型的磺酰脲类超高效除草剂,祥述了Cyclosulfamuron及中间体的合成路线和收率。 相似文献
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Emotional reactions to red, green, blue, and gray colors in a living room were investigated using a self-report measure. Participants first watched a short video of a 3D model of a living room. Next, they were asked to match the living rooms with facial expressions of six basic emotions. The most stated emotions associated for the red room were disgust and happiness, while the least stated emotions were sadness, fear, anger, and surprise; for the green room, neutral and happiness were the most stated emotions, and anger, surprise, fear, and sadness were the least stated ones; for the blue room, neutral was the most stated emotion, while the least stated emotions were anger and surprise. Neutral, disgust, and sadness were the most stated emotions for the gray room. Gender differences were not found in human emotional reactions to living rooms with different wall colors. 相似文献
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《塑料、橡胶和复合材料》2013,42(1):23-30
AbstractInjection moulding studies are reported, during which in process measurements have been used to monitor batch to batch variation of several production grade polymers. Three materials were studied: a polyamide 6, a polyacetal, and a flexible poly(vinyl chloride), all of which were commercial injection moulding polymers supplied by industrial collaborators. Instrumented high precision electric and servohydraulic moulding machines were used to mould parts in house from a number of different material batches. Moulding conditions were kept constant throughout and several process variables were monitored during injection, including melt pressure, melt temperature, and viscosity index –a specific pressure integral calculated from primary injection. Part weights were measured to provide an indication of part quality. Results showed that in each case, variations between batches produced a measurable effect on part quality. These variations were detected by in process measurements, particularly by viscosity index, which tracked significant changes in part weight. Several ‘problem’batches not identified by the compounder's internal quality checks were detected, and the influence of regrind and a development compound were also clearly identified. No simple relationship between viscosity index and part quality was observed for the limited processing range covered. Overall, the studies show the potential of in process measurements to provide a real time, sensitive indication of process variation. 相似文献
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本文以2-氨基-4-氯-5-醛基噻唑为重氮组分合成了一系列含醛基分散染料,进而与合活泼亚甲基的化合物缩合得到一系列含氰乙烯基的分散染料.对染料结构进行了表征,并测试了染料的吸收光谱.结果表明氰乙烯基的引入使得λmax和εmax都有所增大. 相似文献
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Hyun Chung Arum Choi In Hee Cho Young‐Suk Kim 《European Journal of Lipid Science and Technology》2011,113(12):1481-1490
Mackerel is known to be a rich source of omega‐3 family PUFAs. The acid value and conjugated dienoic acid value of mackerel, known as indices of oxidation, were determined. Fatty acids in both raw and broiled mackerels were analyzed by GC. PUFAs and saturated fatty acids were observed at a low level in broiled mackerel, possibly as a result of thermal degradation of the lipids. In addition, volatile components in mackerel extracted by solvent‐assisted flavor evaporation were analyzed by GC‐MS. In total, 38 volatile components were detected in raw mackerel, whereas 53 volatiles were found in broiled mackerel. Hydrocarbons and methyl‐ and/or ethyl‐substituted benzenes were quantitatively dominant. Levels of aldehydes and alcohols were significantly enhanced in broiled mackerel, as was the level of benzothiazole, which possibly forms as a result of the condensation of thermal degradation products from amino acids and/or proteins, and lipids. 相似文献
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Experiments were performed in a shear cell device under four different solid fractions. The glass spheres with a mean diameter of 3 mm were used as granular materials. The motions of the granular materials were recorded by a high-speed camera. By using image processing technology and a particle tracking method, the average and fluctuation velocities in the streamwise and the transverse directions could be successfully measured and analyzed. Three bi-directional stress gages were used to measure the normal and shear stresses along the upper boundary. The effective viscosity of the granular material flow can be calculated. By tracking the movements of particles continually, the curves of the mean-square diffusive displacements versus time were plotted and were used to determine the self-diffusion coefficients from the slopes of the curves. The fluctuations and the self-diffusion coefficients in the streamwise direction were much higher than those in the transverse direction. The fluctuations were found to increase with the solid fraction, but the diffusion coefficients were greater in a more dilute flow system. 相似文献
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Chemoattraction of individualBiomphalaria glabrata snails for lipid standards and lipophilic fractions of leaf lettuce and Tetramin were studied in a Petri dish bioassay. Snails were more significantly attracted to a whole Tetramin lipophilic fraction than that of leaf lettuce. Thin-layer chromatography showed that major neutral lipid fractions in Tetramin were triacylglycerols, free fatty acids, and free sterols, and in leaf lettuce were free fatty acids and a mixed free sterol-chlorophyll fraction. Snails were significantly attracted to both the free fatty acid and free sterol fractions from Tetramin, but only to the free fatty acid fraction from leaf lettuce. Snails were significantly attracted to a mixed lipid standard containing equal amounts of phosphatidylcholine, cholesterol, oleic acid, triolein, and cholesteryl oleate. Of four individual neutral lipid standards tested, i.e., cholesterol, oleic acid, triolein, and cholesteryl oleate, snails were only attracted to cholesteryl oleate. 相似文献
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The synthesis and characterization of two hetarylazo disperse colorants are described. These compounds were used for the preparation of ink-jet inks with and without active agents for polyester printing. The viscosity, conductivity, surface tension, and pH of these inks were studied over a period of time and discussed with respect to their structure and the active agent content. The particle size and particle size distribution of a representative ink containing a new synthesized hetarylazo compound were measured. All the prepared inks were proved to be suitable for ink-jet printing in terms of their particle size. Viscosity , surface tension, conductivity, and pH values of all inks, with and without active agent, were monitored over a period of 90 days and were related to the ink stability. The same properties were measured for an ink preparation with a commercial dye for comparison. The inks containing the new synthesized dyes were found to be more advantageous regarding most of the above properties, i.e., surface tension, viscosity, and conductivity. Contrarily pH values of all the preparations were unacceptable for ink-jet inks. The ink compositions containing the new synthesized compounds were applied by exhaustion (dyed) on polyester fabric. Fastness properties of the dyed polyester samples were excellent to very good in most cases. Color measurements of the dyed fabric were also performed. A qualitative determination of the aroma-active agent adsorbed on the fiber by the exhaustion method was achieved by the GC-MS method. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012 相似文献
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Dispersion polymerization of vinyl acetate (VAc) was studied in a mixed solvent of ethanol and water using poly(vinyl alcohol) (PVA) with a low degree of hydrolysis as a steric stabilizer. Six compositions were chosen from a homogeneous phase before the polymerization. In a composition with the highest solubility parameter, 450 nm particles with a size distribution close to monodispersity were obtained. With decreasing solubility parameters of the compositions, the particles became polydisperse. In the compositions with solubility parameter lower than 17.1, particles were not formed even at 100 % conversion. Degrees of polymerization obtained in this homogeneous phase were less than 100 and close to calculated values. With increasing solubility parameters of the system, degrees of polymerization increased but were still less than 200. Grafting of VAc onto PVA and grafted PVA were very small, indicating the presence of a competing reaction to the grafting. Copyright © 2004 Society of Chemical Industry 相似文献
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目的观察FoxO3a基因缺失致小鼠脾脏进行性慢性炎性反应。方法分别于16周、24周和12个月称取FoxO3a基因敲除小鼠和对照小鼠体重;于16、24和38周处死各组小鼠,取脾脏,肉眼观察脾脏变化,并制备脾细胞悬液,进行细胞计数,同时取各组小鼠卵巢、肺及皮下等组织,观察其炎性变化。流式细胞术检测24周的FoxO3a基因敲除小鼠和对照小鼠脾细胞中T、B淋巴细胞和Mac-1+细胞数量及百分率;Real-time PCR检测脾细胞中炎性细胞因子S100A8和S100A9基因mRNA的表达水平。结果与对照小鼠相比,FoxO3a基因敲除小鼠脾脏明显肥大,且随年龄增加更加显著,卵巢、肺及皮下等组织内可见大量炎性细胞浸润,脾细胞数明显升高;基因敲除组老年小鼠的体重明显低于对照小鼠;FoxO3a基因敲除小鼠的脾细胞中T、B淋巴细胞数增加明显,但所占脾细胞的百分率无明显增加,Mac-1+细胞数和百分率均明显增加;S100A8和S100A9基因mRNA的表达水平明显高于对照小鼠。结论 FoxO3a基因缺失致小鼠脾脏进行性慢性炎性反应。 相似文献