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Search Results: 1 - 10 of 9322 matches for " YUE Yongde "
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Method for Testing the Photodegradability of Herbicides Adsorbed on HPTLC Plates

Yue Yongde,

环境科学 , 1995,
Abstract: 研究了绿麦隆和消草醚2种除草剂在硅胶G高效薄层上的光稳定性,提出应用高效薄层析技术作为农药吸附态光解的一种试验方法。在高效薄层上直接点样,同一薄层上包括照光、黑暗对照和定量曲线样品,原始剂量400—800ng·1×5mm斑点-1,照光后直接展开和扫描定量测定,最低检测量可达20ng·斑点-1。本方法无须对样品进行提取、净化等处理,具有快速高效、重复性好,且可直观光解产物等优点。
Effects of dissolved compounds on photodegradation of mefenacet in water

CHU Mingjie,YUE Yongde,HUA Rimao,TANG Feng,

应用生态学报 , 2006,
Abstract: The study with high-pressure mercury lamp illuminating showed that after illuminated for 15 min, NO2- and NO3- quenched the photolysis of mefenacet, and NO3- with a concentration ratio 10:1 (mass) had the most obvious effect, its quenching rate being up to 53.3%. Halogen ions inhibited the photolysis of mefenacet by "weight atom effect". When the concentration ratio of I- was 10:1, the quenching rate was 76.9% after illuminated for 15 min. Surfactants Nongru 500, Nongru 404, Nongru 601 and Nongru 603 had different effects on the photodegradation of mefenacet. At concentration ratios 1:5 and 1:1, only Nongru 404 showed a weak photosensitive effect, while in the other cases, all the four surfactants had photoquenching effects. Among the four herbicides benthiocarb, bensulfuron, alachlor and chlorsulfuron, only bensulfuron at low concentration ratio (1 : 10) accelerated the photolysis of mefenacet, with a photosensitive proportion of 18.2% after illuminated for 25 min. Aerified N2 could accelerate the photolysis of mefenacet, and the half-life was shortened from 7.14 min to 6.70 min without aerifying N2.
Studies on photodegradation of carbendazim in solvents and aqueous solutions

XU Baocai,YUE Yongde,HU Yinghui,HUA Rimao,

环境科学学报 , 2000,
Abstract: Under sunlight or high pressure mercury lamp(HPML),the phototransformation of carbendazim in solvents and aqueous solutions was studied.The main results were summarized as follows:Carbendazim decomposed very slowly in aqueous phase, n \|hexane and methanol under sunlight.The photolytic rate of MBC in acetone was high with half\|life of 33.80?h.Photosensitizer such as riboflavin,0 5% acetone and Fe 3 ,can enhance photolysis of MBC in aqueous solutions.Among them,riboflavin is the most senstivive one MBC can be degraded by 53 47% after 16 hours.Three pesticides,namely,triadimefon,butachlor,and carbofuran can affected significantly the photodecomposition of MBC in water under HPML.By 2 hours irradiation,the photoquench efficiency of triadimefon,butachlor and carbofuran on cabendazim are 244 05%,252 81%,and 262 92%,respectively.Under HPML,direct photolysis is the main process.The half\|life in redistilled water is 74 62?min.The photolytic rates of carbendazim in different water types or pH show following sequence:redistilled water>river water>pond water,or,pH4>pH9>pH7.
Studies on the photodegradation of Mefenacet in different water samples

CHU Mingjie,YUE Yongde,HUA Rimao,TANG Feng,

环境科学学报 , 2005,
Abstract: To study the effect of different waters on the photodegradation of Mefenacet, the photolysis of Mefenacet in pure water, natural water and buffer was studied. It indicated that in natural water samples, under the high-pressure mercury lamp(HPML) and xenon lamp(XL), the photo-half-lives of Mefenacet ranged samely as: paddy water > river water > lake water > river water(reservoir water) > redistilled water. The photo-half-lives under XL ranged from 607.80?min to (1016.40)?min, and under HPML ranged from 12.31?min to 18.53?min respectively. At room temperature, Mefenacet hydrolyzed easily in solution of pH=11.92. Under HPML, in buffers of pH=1.98 and 11.92, it photodegraded faster than in pure water, and the half-lives were 6.04?min(pH=1.98), 6.51?min(pH=11.92) and 6.75?min(redistilled water) respectively. Detecting the photoproducts by HPLC-MS indicated that a Metabolic pathway of mefenacet initiated by hydrolysis of amido groups and ether groups.
Photochemical degradation of chlorothalonil in aqueous solution

LI Xuede,HUA Rimao,YUE Yongde,LI Ying,TANG Feng,TANG Jun,

应用生态学报 , 2006,
Abstract: The study on the effects of light source, solution pH and temperature, and surfactant on the photochemical degradation of chlorothalonil showed that the half-life of chlorothalonil photodegradation under high pressure mercury lamp (HPML), UV lamp and sunlight was 22.4, 82.5 and 123.8 min, respectively. Under HPML and sunlight, chlorothalonil had a higher photolysis rate in alkaline solution than in neutral and acid solution. The photolysis rate increased with increasing solution temperature in the range of 10 degrees C - 40 degrees C, which was doubled when the temperature increased every 10 degrees C. Sodium laurylsulfonate (SDS), sodium dodecylbenzene sulfonate (SDBS), Tween 60 and Span 20 showed significant photosensitizing effects, while cetyltrimethylammonium bromide (CTAB) had significant photoquench effect on the photolysis of chlorothalonil.
Photoquenching effect of nine pesticides on the photolysis of butachlor in water

HUA Rimao,YUE Yongde,QI Chuanyong,TANG Feng,LI Xiangqiong,FAN Defang,

环境科学学报 , 2000,
Abstract: The photoquenching effects of bensulfuron\|methyl,acetochlor, trifluralin,MCPA,glyphosate,methsulfuron methyl,methomyl,parathion\|methyl,carbendazim on the butachlor photolysis in water under xenon lamp, high pressure mercury lamp and sunlight irradiation were studied.The results showed: The photolysis rate of butachlor was slow down by these tested pesticides;the photoquenching efficiencies of glyphosate,parathion\|methyl and acetochlor were higher than the others.The photoquenching efficiency was positively related to the dosage of parathion\|methyl,trifluralin,glyphosate and bensulfuron\|methyl.
Three new species of Potamothrix (Oligochaeta, Naididae, Tubificinae) from Fuxian Lake, the deepest lake of Yunnan Province, Southwest China
Yongde Cui,Hongzhu Wang
ZooKeys , 2012, DOI: 10.3897/zookeys.175.2413
Abstract: Three new species of Potamothrix Vejdovsky & Mrázek, 1902 (Oligochaeta: Tubificinae), P. praeprostatus sp. n., P. paramoldaviensis sp. n. and P. parabedoti sp. n., are reported from Fuxian Lake of Yunnan Province, Southwest China. P. praeprostatus differs from its allies by its prostate glands joining atria in its proximal to middle portion, and spermathecal chaetae. P. paramoldaviensis is distinguishable from its allies bypenial chaeta but no penes, and differs from P. moldaviensis by its homogenous atrium. P. parabedoti is distinctive in the position of its reproductive organs, and differs from P. bedoti by its homogenous atrium. Hitherto, 34 freshwater oligochaete species have been recorded in Yunnan Province, including nine endemic species from the plateau lakes.
Calculating the relative entropy of entanglement
Shengjun Wu,Yongde Zhang
Physics , 2000, DOI: 10.1088/0256-307X/18/2/302
Abstract: We extend Vedral and Plenio's theorem (theorem 3 in Phys. Rev. A 57, 1619) to a more general case, and obtain the relative entropy of entanglement for a class of mixed states, this result can also follow from Rains' theorem 9 in Phys. Rev. A 60, 179.
Multipartite pure-state entanglement and the generalized GHZ states
Shengjun Wu,Yongde Zhang
Physics , 2000, DOI: 10.1103/PhysRevA.63.012308
Abstract: We show that not all 4-party pure states are GHZ reducible (i.e., can be generated reversibly from a combination of 2-, 3- and 4-party maximally entangled states by local quantum operations and classical communication asymptotically) through an example, we also present some properties of the relative entropy of entanglement for those 3-party pure states that are GHZ reducible, and then we relate these properties to the additivity of the relative entropy of entanglement.

Wang Yongde,

心理学报 , 2004,
Abstract: This study explored whether foreign students' native languages affect their Chinese grammar acquisition. The subjects were native English, Japanese, and Korean speakers whose Chinese was at the elementary level . Six constructions of Chinese sentences, including subject-verb-object(zhu dong bin)construction, two topic-comment constructions, two Ba constructions, and Bei construction were chosen as the test materials. In the study, the subjects were requested to choose suitable words from the list in the questionnaire, to compare grammatical structure of each example sentence given, then make a corresponding sentence whose grammatical structure was similar to that of the example sentence. Six sentences were made one by one. The rules were defined to score each of the sentences which the subjects made after the test. The results showed that their performances were related to their native languages. There was significant difference between the subjects whose native language was English and those whose native languages were Japanese and Korean in the production of four Chinese sentence constructions: subject-verb-object construction, two topic-comment constructions and one of Ba constructions. The Chinese sentence constructions similar to their native language were mastered more easily than those different to their native language. The findings supported the notion that second language acquisition is affected by learners' native language and suggested that the foreign students should be taught according to the types of their native languages while teaching Chinese as a second language at the elementary level.
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