为探究封闭式除草剂苗后喷施对小麦生长和杂草的影响,以周麦22为试验材料,设置砜吡草唑用量125(T1)、250(T2)、500(T3)、1000(T4)、2000(T5)g a.i./hm^(2)和氟噻草胺用量184.5(T6)、369(T7)、738(T8)、1476(T9)g a.i./hm^(2)9个喷药处理...为探究封闭式除草剂苗后喷施对小麦生长和杂草的影响,以周麦22为试验材料,设置砜吡草唑用量125(T1)、250(T2)、500(T3)、1000(T4)、2000(T5)g a.i./hm^(2)和氟噻草胺用量184.5(T6)、369(T7)、738(T8)、1476(T9)g a.i./hm^(2)9个喷药处理和1个空白(清水)对照,研究不同除草剂对小麦光合特性、叶绿素SPAD值、光合有效辐射(IPAR)、叶面积指数(LAI)、鲜质量的影响及对杂草的化除效果。结果表明:T1、T6处理下小麦叶片的净光合速率高于对照,9个处理蒸腾速率均低于对照,T6、T1处理数值较大,气孔导度T1处理最大;胞间CO_(2)浓度T9处理最大,T1处理最小。在除草剂施用21 d时,T1处理SPAD值与对照差异有统计学意义。T1、T2、T3、T6、T7处理下,小麦IPAR和LAI均高于对照,且以T1处理下值最大,较对照分别增加18.37%、37.77%,T2次之。砜吡草唑施药剂量在125、250 g a.i./hm^(2)时(T1和T2)对小麦株高和鲜质量没有显著性影响;当剂量>250 g a.i./hm^(2)时,则会出现抑制症状,氟噻草胺不同用量小麦株高和鲜质量均受抑制。可见,T1和T2处理对小麦生长发育影响较小。T4、T5和T93个处理对所试杂草鲜质量防效均高于95%,T1和T62个处理对野燕麦的防效不明显。考虑到对小麦生长安全和用药成本,在对节节麦和野燕麦鲜质量防效达到50%~95%且对其余供试杂草鲜质量防效均高于95%的6个处理(T2、T3、T4、T5、T8、T9)中,推荐T2处理用于麦田苗后喷施。展开更多
In order to obtain appropriate spray pressure and enhance the spraying and dust removal efficiency, various factors including the dust characteristics, nozzle spraying angle, effective spraying range, water consumptio...In order to obtain appropriate spray pressure and enhance the spraying and dust removal efficiency, various factors including the dust characteristics, nozzle spraying angle, effective spraying range, water consumption and droplet size are taken into account. The dust characteristics from different mines and atomization parameters of different pressure nozzles were measured. It was found that the internal pressure of coal cutters and roadheaders should be kept at 2 MPa, which could ensure large droplet size, large spraying angle and low water consumption and hence realizing a large-area covering and capture for large particle dusts. However, the external spray pressure should be kept at 4 MPa for smaller droplet size and longer effective spraying range, leading to effective dust removal in the operator zone. The spray pressure of support moving, drawing opening, and stage loader on a fully mechanized caving face and stage loader on a fully mechanized driving face should be kept at 8 MPa, under which the nozzles have long effective spraying range, high water flow and small droplet size for the rapid capture of instantaneous, high-concentration and small size dust groups. From the applications on the caving and driving faces in the coal mines, it is indicated that the optimization of spray pressure in different spraying positions could effectively enhance dust removal efficiency. Selecting appropriate nozzles according to the dust characteristics at different positions is also favorable for dust removal efficiency. With the selected nozzles under optimal pressures, the removal rates of both total dust and respirable dust could reach over70%, showing a significant de-dusting effect.展开更多
[Objective] This paper aims to study a new method of extracting pumpkin polysaccharide from pumpkin. Single factor experiments were conducted to examine the effects of extracting time,temperature,the solid-liquid rati...[Objective] This paper aims to study a new method of extracting pumpkin polysaccharide from pumpkin. Single factor experiments were conducted to examine the effects of extracting time,temperature,the solid-liquid ratio and pH value on the extraction yield of polysaccharide from pumpkin. [Method] The best enzyme ratio and extraction conditions for complex enzymes extraction were determined through orthogonal tests. Scavenging ·OH and O-2 activities of pumpkin polysaccharides were also investigated by salicylic acid and improved self-oxidation of o-pheno methods respectively. [Results] The results showed that the biggest extraction yield of polysaccharide from pumpkin can be got when adding 1% cellulose enzyme,1.5% pectinase,1.0% papain and Na2HPO4-citric acid buffer solution (pH was 4.6),and oscillating for 30 min under water at 40 ℃ with the solid-liquid ratio of 1:30. In addition,pumpkin polysaccharides had a strong activity of eliminating ·OH,but very weak activity to scavenge O-2. [Conclusion] This study provided basic data for research and application of Pumpkin polysaccharide.展开更多
Biochemical mechanism of forming the red tide is discussed in this paper. The existence of a large number of nitrates and phosphates in the eutrophic water is the prerequisite of explosive increase of algae and the fo...Biochemical mechanism of forming the red tide is discussed in this paper. The existence of a large number of nitrates and phosphates in the eutrophic water is the prerequisite of explosive increase of algae and the forming of red tide. Reduction of eutrophication is an important approach to preventing the red tide. The method of deep treatment of the waste water and its denitrification and dephosphorization are introduced, and a new opinion on the red tide formation and fundamental prevention is put forward.展开更多
Peripheral primitive neuroectodermal tumor(pPNET) is an extremely rare disease entity of malignant tumors belonging to the Ewing sarcoma family that usually occurs in children and adolescents. We describe a 41-year-ol...Peripheral primitive neuroectodermal tumor(pPNET) is an extremely rare disease entity of malignant tumors belonging to the Ewing sarcoma family that usually occurs in children and adolescents. We describe a 41-year-old female who presented with right upper abdominal pain. Surgical resection and biopsy revealed small round-cell tumor. Combined with immunohistochemical analysis, pPNET was diagnosed. No evidence of recurrence was noted at 18 months postoperatively. Even thought pPNET is a highly malignant tumor, Wide tumor-free resection and multi-agent chemotherapy can also obtain good clinical outcomes.展开更多
In order to investigate the effect of stripping and catalytic ozone oxidation technology on COD and ammonia nitrogen removal after coagulation and sedimentation, the efficiency of ozone oxidation and catalytic ozone o...In order to investigate the effect of stripping and catalytic ozone oxidation technology on COD and ammonia nitrogen removal after coagulation and sedimentation, the efficiency of ozone oxidation and catalytic ozone oxidation were compared. The experimental results showed that： stripping and catalytic ozone oxidation technology has a significant effect on landfill leachate treatment. The removal rate of the COD and NH3-N can reach 88.60% and 98.00% under the initial concentration of COD and NH3-N were 2053.35 mg/L and l 123. 76 mg/L separately.展开更多
文摘为探究封闭式除草剂苗后喷施对小麦生长和杂草的影响,以周麦22为试验材料,设置砜吡草唑用量125(T1)、250(T2)、500(T3)、1000(T4)、2000(T5)g a.i./hm^(2)和氟噻草胺用量184.5(T6)、369(T7)、738(T8)、1476(T9)g a.i./hm^(2)9个喷药处理和1个空白(清水)对照,研究不同除草剂对小麦光合特性、叶绿素SPAD值、光合有效辐射(IPAR)、叶面积指数(LAI)、鲜质量的影响及对杂草的化除效果。结果表明:T1、T6处理下小麦叶片的净光合速率高于对照,9个处理蒸腾速率均低于对照,T6、T1处理数值较大,气孔导度T1处理最大;胞间CO_(2)浓度T9处理最大,T1处理最小。在除草剂施用21 d时,T1处理SPAD值与对照差异有统计学意义。T1、T2、T3、T6、T7处理下,小麦IPAR和LAI均高于对照,且以T1处理下值最大,较对照分别增加18.37%、37.77%,T2次之。砜吡草唑施药剂量在125、250 g a.i./hm^(2)时(T1和T2)对小麦株高和鲜质量没有显著性影响;当剂量>250 g a.i./hm^(2)时,则会出现抑制症状,氟噻草胺不同用量小麦株高和鲜质量均受抑制。可见,T1和T2处理对小麦生长发育影响较小。T4、T5和T93个处理对所试杂草鲜质量防效均高于95%,T1和T62个处理对野燕麦的防效不明显。考虑到对小麦生长安全和用药成本,在对节节麦和野燕麦鲜质量防效达到50%~95%且对其余供试杂草鲜质量防效均高于95%的6个处理(T2、T3、T4、T5、T8、T9)中,推荐T2处理用于麦田苗后喷施。
基金support from the National Natural Science Foundation of China (Nos.U1261205, 51474139 and 51204103)the Science and Technology Development Plan of Shandong Province (No.2013GSF12004)the Excellent Young Scientific Talents Project of Shandong University of Science and Technology (No.2014JQJH106)
文摘In order to obtain appropriate spray pressure and enhance the spraying and dust removal efficiency, various factors including the dust characteristics, nozzle spraying angle, effective spraying range, water consumption and droplet size are taken into account. The dust characteristics from different mines and atomization parameters of different pressure nozzles were measured. It was found that the internal pressure of coal cutters and roadheaders should be kept at 2 MPa, which could ensure large droplet size, large spraying angle and low water consumption and hence realizing a large-area covering and capture for large particle dusts. However, the external spray pressure should be kept at 4 MPa for smaller droplet size and longer effective spraying range, leading to effective dust removal in the operator zone. The spray pressure of support moving, drawing opening, and stage loader on a fully mechanized caving face and stage loader on a fully mechanized driving face should be kept at 8 MPa, under which the nozzles have long effective spraying range, high water flow and small droplet size for the rapid capture of instantaneous, high-concentration and small size dust groups. From the applications on the caving and driving faces in the coal mines, it is indicated that the optimization of spray pressure in different spraying positions could effectively enhance dust removal efficiency. Selecting appropriate nozzles according to the dust characteristics at different positions is also favorable for dust removal efficiency. With the selected nozzles under optimal pressures, the removal rates of both total dust and respirable dust could reach over70%, showing a significant de-dusting effect.
基金Supported by the Key Scientific and Technological Project of Henan Province (102102110157)the Scientific Research Found Project of Henan University of Urban Construction (2010JZD008)~~
文摘[Objective] This paper aims to study a new method of extracting pumpkin polysaccharide from pumpkin. Single factor experiments were conducted to examine the effects of extracting time,temperature,the solid-liquid ratio and pH value on the extraction yield of polysaccharide from pumpkin. [Method] The best enzyme ratio and extraction conditions for complex enzymes extraction were determined through orthogonal tests. Scavenging ·OH and O-2 activities of pumpkin polysaccharides were also investigated by salicylic acid and improved self-oxidation of o-pheno methods respectively. [Results] The results showed that the biggest extraction yield of polysaccharide from pumpkin can be got when adding 1% cellulose enzyme,1.5% pectinase,1.0% papain and Na2HPO4-citric acid buffer solution (pH was 4.6),and oscillating for 30 min under water at 40 ℃ with the solid-liquid ratio of 1:30. In addition,pumpkin polysaccharides had a strong activity of eliminating ·OH,but very weak activity to scavenge O-2. [Conclusion] This study provided basic data for research and application of Pumpkin polysaccharide.
文摘Biochemical mechanism of forming the red tide is discussed in this paper. The existence of a large number of nitrates and phosphates in the eutrophic water is the prerequisite of explosive increase of algae and the forming of red tide. Reduction of eutrophication is an important approach to preventing the red tide. The method of deep treatment of the waste water and its denitrification and dephosphorization are introduced, and a new opinion on the red tide formation and fundamental prevention is put forward.
文摘Peripheral primitive neuroectodermal tumor(pPNET) is an extremely rare disease entity of malignant tumors belonging to the Ewing sarcoma family that usually occurs in children and adolescents. We describe a 41-year-old female who presented with right upper abdominal pain. Surgical resection and biopsy revealed small round-cell tumor. Combined with immunohistochemical analysis, pPNET was diagnosed. No evidence of recurrence was noted at 18 months postoperatively. Even thought pPNET is a highly malignant tumor, Wide tumor-free resection and multi-agent chemotherapy can also obtain good clinical outcomes.
文摘In order to investigate the effect of stripping and catalytic ozone oxidation technology on COD and ammonia nitrogen removal after coagulation and sedimentation, the efficiency of ozone oxidation and catalytic ozone oxidation were compared. The experimental results showed that： stripping and catalytic ozone oxidation technology has a significant effect on landfill leachate treatment. The removal rate of the COD and NH3-N can reach 88.60% and 98.00% under the initial concentration of COD and NH3-N were 2053.35 mg/L and l 123. 76 mg/L separately.
