采用20 L球形爆炸装置进行煤尘爆炸实验,研究了不同条件下煤尘爆炸后气体体积分数变化及生成规律。结果表明:爆炸残留气体成分及体积分数与煤尘浓度、粒径、点火能量以及煤尘变质程度关系密切。随煤尘浓度升高,爆炸后残留气体体积分数φ...采用20 L球形爆炸装置进行煤尘爆炸实验,研究了不同条件下煤尘爆炸后气体体积分数变化及生成规律。结果表明:爆炸残留气体成分及体积分数与煤尘浓度、粒径、点火能量以及煤尘变质程度关系密切。随煤尘浓度升高,爆炸后残留气体体积分数φ(CH4),φ(CO),φ(H2)及φ(CO)/φ(CO2)呈上升趋势,φ(CO2)呈先上升后下降趋势。一定范围内随煤尘粒径减小,φ(CH4)增大,φ(CO)及φ(CO)/φ(CO2)呈减小趋势,当粒径小于25μm时,φ(CH4)急剧减小。随点火能量增大,φ(CH4)及φ(CO)增大,φ(CO)/φ(CO2)整体变化量不大,当点火能量大于10 k J时,φ(O2)明显减小。随煤尘变质程度增加,φ(CO)/φ(CO2)先增大后减小,φ(CH4)整体呈降低趋势,烟煤煤尘爆炸消耗的O2量较褐煤、无烟煤少。展开更多
目的考评一次性使用输血器的血液相容性及其使用前后的成分血残留和成分血损伤情况。方法通过称重法分别检测悬浮红细胞(悬红)、浓缩血小板、新鲜冰冻血浆(FFP)流经2种国产一次性使用输血器(A、B)前后的各成分血重量,计算成分血残留率...目的考评一次性使用输血器的血液相容性及其使用前后的成分血残留和成分血损伤情况。方法通过称重法分别检测悬浮红细胞(悬红)、浓缩血小板、新鲜冰冻血浆(FFP)流经2种国产一次性使用输血器(A、B)前后的各成分血重量,计算成分血残留率、红细胞上清中的游离血红蛋白(FHb)、钾离子(K+),血小板pH值、低渗休克反应(HSR)、乳酸脱氢酶(LDH)、P选择素在血小板表面上的表达(CD62P),以及血浆的凝血酶原片段1,2(F_(1+2))、纤维蛋白A(FPA)、凝血因子Ⅻa(FⅫa)、凝血酶抗凝血酶复合物(TAT)等相关指标,考察输血器的血液相容性。结果悬红、浓缩血小板、FFP各1U流经2种输血器后均为残留率<5%。悬红流经2种输血器前后的FHb和K^(+)含量无明显变化(P>0.05);浓缩血小板流经2种输血器前后,血小板的pH值、LDH(U/L)和CD62P活化率(%)均无明显改变(P>0.05);流经产品A前后血小板HSR相近(P>0.05),流经产品B后血小板HSR分别为为37.17±6.49 vs 40.75±6.24(P<0.05)。FFP流经2种输血器前后的F_(1+2)、FPA、FⅫa和TAT无明显改变(P>0.05)。结论 2种国产一次性使用输血器对红细胞、血小板和血浆等成分血的残留符合要求,且无明显损伤和激活。展开更多
Selected persistent organochlorine pesticides (OCPs), including 1,1,1-trichloro-2,2-bis(p-chlorophenyl)ethane (DDT) and its principal metabolites 1,1-dichloro-2,2-bis(p-chlorophenyl)ethylene (DDE) and 1,1-dichloro-2,2...Selected persistent organochlorine pesticides (OCPs), including 1,1,1-trichloro-2,2-bis(p-chlorophenyl)ethane (DDT) and its principal metabolites 1,1-dichloro-2,2-bis(p-chlorophenyl)ethylene (DDE) and 1,1-dichloro-2,2-bis(p-chlorophenyl)e- thane (DDD), hexachlorocyclohexane (HCH) and its isomers (α-,β-, γ-, and δ-HCH), hexachlorobenzene (HCB), endo- sulfan, dieldrin, and endrin were quantified to determine current levels of organochlorine pesticides, to assess the eco- toxicological potential, and to distin…展开更多
The objectives of this study were to optimize instrumental parameters and conditions for analysis of selected organop- hosphorus pesticides (OPPs) by gas chromatography (GC) with nitrogen-phosphorus detection (NPD) (G...The objectives of this study were to optimize instrumental parameters and conditions for analysis of selected organop- hosphorus pesticides (OPPs) by gas chromatography (GC) with nitrogen-phosphorus detection (NPD) (GC-NPD); to select an appropriate solvent system; to conduct a comparison of sonication and shaking extractions; and to select an appropriate procedure for extracting organophosphorus pesticides from soils. Procedure I consisted of n-hexane or petroleum ether together with acetone used as solvents, while Procedure contained several solvents including acetone, methanol, dichloromethane, and n-hexane or petroleum ether. Experimental results indicated that a mixture of petroleum ether/acetone (2:1, v/v) could be used in place of n-hexane/acetone (2:1, v/v) as it was a less expensive solvent system. In addition, shaking under a water bath at 20 °C was more effective than sonication. Also, Procedure I was more effective, safer, and more timesaving than Procedure Procedure I was applied to three soil types of different organic matter content, with recoveries of the OPPs from the yellow-brown soils, which had a higher organic matter content, being lower than those from the yellow and red soils.展开更多
Persistence behavior of imidacloprid and beta-cyfluthrin in black pepper was studied following application of formulation of Solomon at 0.6 （recommended dose） and 1.2 （double recommended dose） g a.i./ha for one pe...Persistence behavior of imidacloprid and beta-cyfluthrin in black pepper was studied following application of formulation of Solomon at 0.6 （recommended dose） and 1.2 （double recommended dose） g a.i./ha for one pepper production cycle. The results also showed that the Solomon at 0.6 mL/L concentration significantly suppressed the pest infestation in pepper vines. Pepper vine treated with Solomon produce more berries compared to control and showed no phytotoxicity. Analytical procedure of Solomon active ingredient was validated prior to actual analysis. Satisfactory recoveries ranging between 87.6%-106.7% were obtained for the fortified pepper berries samples. Results showed low level of imidacloprid and beta-cyfluthrin residues in dried pepper berries ranging between 〈 0.01 mg/kg to 1.43 mg/kg and 〈 0.01 mg/kg to 1.612 mg/kg respectively. The half-life value period for imidacloprid were found to be 2.06 and 2.30 days and for beta-cyfluthrin, these values were observed to be 1.57 and 1.49 days respectively at recommended and double recommended dose. Imidacloprid and beta-cyfluthrin residue dissipated below the limit of quantification （LOQ） of 0.01 mg/kg after 7 and 9 days respectively at recommended and double recommended dose. Soil sample collected 15 days after the last spray did not show the present of Imidacloprid and beta-cyfluthrin residue at their detection limit of 0.01 mg/kg.展开更多
文摘采用20 L球形爆炸装置进行煤尘爆炸实验,研究了不同条件下煤尘爆炸后气体体积分数变化及生成规律。结果表明:爆炸残留气体成分及体积分数与煤尘浓度、粒径、点火能量以及煤尘变质程度关系密切。随煤尘浓度升高,爆炸后残留气体体积分数φ(CH4),φ(CO),φ(H2)及φ(CO)/φ(CO2)呈上升趋势,φ(CO2)呈先上升后下降趋势。一定范围内随煤尘粒径减小,φ(CH4)增大,φ(CO)及φ(CO)/φ(CO2)呈减小趋势,当粒径小于25μm时,φ(CH4)急剧减小。随点火能量增大,φ(CH4)及φ(CO)增大,φ(CO)/φ(CO2)整体变化量不大,当点火能量大于10 k J时,φ(O2)明显减小。随煤尘变质程度增加,φ(CO)/φ(CO2)先增大后减小,φ(CH4)整体呈降低趋势,烟煤煤尘爆炸消耗的O2量较褐煤、无烟煤少。
文摘目的考评一次性使用输血器的血液相容性及其使用前后的成分血残留和成分血损伤情况。方法通过称重法分别检测悬浮红细胞(悬红)、浓缩血小板、新鲜冰冻血浆(FFP)流经2种国产一次性使用输血器(A、B)前后的各成分血重量,计算成分血残留率、红细胞上清中的游离血红蛋白(FHb)、钾离子(K+),血小板pH值、低渗休克反应(HSR)、乳酸脱氢酶(LDH)、P选择素在血小板表面上的表达(CD62P),以及血浆的凝血酶原片段1,2(F_(1+2))、纤维蛋白A(FPA)、凝血因子Ⅻa(FⅫa)、凝血酶抗凝血酶复合物(TAT)等相关指标,考察输血器的血液相容性。结果悬红、浓缩血小板、FFP各1U流经2种输血器后均为残留率<5%。悬红流经2种输血器前后的FHb和K^(+)含量无明显变化(P>0.05);浓缩血小板流经2种输血器前后,血小板的pH值、LDH(U/L)和CD62P活化率(%)均无明显改变(P>0.05);流经产品A前后血小板HSR相近(P>0.05),流经产品B后血小板HSR分别为为37.17±6.49 vs 40.75±6.24(P<0.05)。FFP流经2种输血器前后的F_(1+2)、FPA、FⅫa和TAT无明显改变(P>0.05)。结论 2种国产一次性使用输血器对红细胞、血小板和血浆等成分血的残留符合要求,且无明显损伤和激活。
基金1Project supported by the National Key Basic Research Support Foundation (NKBRSF) of China (No. 2002CB410805)and the Outstanding Youth Fund of National Natural Science Foundation of China (No. 40325001).
文摘Selected persistent organochlorine pesticides (OCPs), including 1,1,1-trichloro-2,2-bis(p-chlorophenyl)ethane (DDT) and its principal metabolites 1,1-dichloro-2,2-bis(p-chlorophenyl)ethylene (DDE) and 1,1-dichloro-2,2-bis(p-chlorophenyl)e- thane (DDD), hexachlorocyclohexane (HCH) and its isomers (α-,β-, γ-, and δ-HCH), hexachlorobenzene (HCB), endo- sulfan, dieldrin, and endrin were quantified to determine current levels of organochlorine pesticides, to assess the eco- toxicological potential, and to distin…
基金1Project supported by the Outstanding Youth Fund of the National Natural Science Foundation of China (No. 40325001),the National Key Basic Research Support Foundation of China (Nos. 2002CB415203 and 2002CB410805) and the Knowl-edge Innovation Program of
文摘The objectives of this study were to optimize instrumental parameters and conditions for analysis of selected organop- hosphorus pesticides (OPPs) by gas chromatography (GC) with nitrogen-phosphorus detection (NPD) (GC-NPD); to select an appropriate solvent system; to conduct a comparison of sonication and shaking extractions; and to select an appropriate procedure for extracting organophosphorus pesticides from soils. Procedure I consisted of n-hexane or petroleum ether together with acetone used as solvents, while Procedure contained several solvents including acetone, methanol, dichloromethane, and n-hexane or petroleum ether. Experimental results indicated that a mixture of petroleum ether/acetone (2:1, v/v) could be used in place of n-hexane/acetone (2:1, v/v) as it was a less expensive solvent system. In addition, shaking under a water bath at 20 °C was more effective than sonication. Also, Procedure I was more effective, safer, and more timesaving than Procedure Procedure I was applied to three soil types of different organic matter content, with recoveries of the OPPs from the yellow-brown soils, which had a higher organic matter content, being lower than those from the yellow and red soils.
文摘Persistence behavior of imidacloprid and beta-cyfluthrin in black pepper was studied following application of formulation of Solomon at 0.6 （recommended dose） and 1.2 （double recommended dose） g a.i./ha for one pepper production cycle. The results also showed that the Solomon at 0.6 mL/L concentration significantly suppressed the pest infestation in pepper vines. Pepper vine treated with Solomon produce more berries compared to control and showed no phytotoxicity. Analytical procedure of Solomon active ingredient was validated prior to actual analysis. Satisfactory recoveries ranging between 87.6%-106.7% were obtained for the fortified pepper berries samples. Results showed low level of imidacloprid and beta-cyfluthrin residues in dried pepper berries ranging between 〈 0.01 mg/kg to 1.43 mg/kg and 〈 0.01 mg/kg to 1.612 mg/kg respectively. The half-life value period for imidacloprid were found to be 2.06 and 2.30 days and for beta-cyfluthrin, these values were observed to be 1.57 and 1.49 days respectively at recommended and double recommended dose. Imidacloprid and beta-cyfluthrin residue dissipated below the limit of quantification （LOQ） of 0.01 mg/kg after 7 and 9 days respectively at recommended and double recommended dose. Soil sample collected 15 days after the last spray did not show the present of Imidacloprid and beta-cyfluthrin residue at their detection limit of 0.01 mg/kg.
