In order to investigate the characteristics of re-oxidation of residual coal in goafs in close coal seam mining,scanning electron microscope and infrared spectrometer are used to study the changes of coal microstructu...In order to investigate the characteristics of re-oxidation of residual coal in goafs in close coal seam mining,scanning electron microscope and infrared spectrometer are used to study the changes of coal microstructure and chemical reaction of functional groups of eight coal samples at different ranks.Result shows that after initial oxidation,the surface morphology of pore are different,and the porosity of coal is increased and the oxygen adsorption capacity of coal is improved.The change of coal molecular structure and presence of a large amount of active oxygen-containing functional groups lead to increasing tendency of coal to further oxidation.In addition,the higher lever of the initial oxidation is,the easier the re-oxidation occurs.展开更多
Septoria carvi belong to the fungi recently detected on caraway plants in the Polish climatic conditions. In many European countries, this fungus causes significant losses in caraway cultivation and decreases the qual...Septoria carvi belong to the fungi recently detected on caraway plants in the Polish climatic conditions. In many European countries, this fungus causes significant losses in caraway cultivation and decreases the quality and quantity of the herb material. The aim of the present work was to study the fungus harmfulness towards the sowing materials, stems, leaves and umbels of caraway. The pathogenicity tests according to Koch's postulates were carried out for isolates ofS. carvi using post-culture liquids and a water suspension of conidia to inoculate the plants' parts. The studies were conducted in the laboratory, the climatic chamber and in field conditions. S. carvi caused disease symptoms in the form of spots and necrosis on all tested plants organs. The infection was followed by natural openings what was shown by scanning electron microscope (SEM) microscopic observations. The efficiency of inoculation increased injuries and anatomical dipping of plant epidermal tissue. The study showed the ability for asymptomatic S. carvi colonization of inoculated plants' parts. The performed pathogenicity tests and microscopic observations SEM showed that the tested isolates of S. carvi were occasional pathogens of caraway.展开更多
The surface hydrophobization and flotation of a xanthate−hydroxamate collector toward copper oxide mineral were compared with the combined collectors of xanthate and hydroxamate through water contact angle(WCA)and mic...The surface hydrophobization and flotation of a xanthate−hydroxamate collector toward copper oxide mineral were compared with the combined collectors of xanthate and hydroxamate through water contact angle(WCA)and micro-flotation experiments.The results showed that S-[(2-hydroxyamino)-2-oxoethyl]-O-octyl-dithiocarbonate ester(HAOODE)exhibited stronger hydrophobization and better flotation performance to malachite(Cu2(OH)2CO3)than octyl-hydroxamic acid(OHA)and its combination with S-allyl-O-ethyl xanthate ester(AEXE).To understand the hydrophobic intensification mechanism of HAOODE to malachite,zeta potential,atomic force microscopy(AFM)and XPS measurements were carried out.The results recommended that malachite chemisorbed HAOODE to form Cu—HAOODE complexes in which the hydroxamate—(O,O)—Cu and—O—C(—S—Cu)—S—configurations co-existed.The co-adsorption of HAOODE’s hetero-difunctional groups was more stable than the single-functionalgroup adsorption of OHA and AEXE,which produced the“loop”structure and intensified the self-assembly alignment of HAOODE on malachite surfaces.In addition,the“h”shape steric orientation of the double hydrophobic groups in HAOODE facilitated stronger hydrophobization toward malachite than the“line”or“V”hydrophobic carbon chains of OHA or AEXE.Thus,HAOODE achieved the preferable flotation recovery of malachite particles in comparison with OHA and AEXE.展开更多
阿娇告诉我她要离开这个城市,说这话时她的一个指头无意识地点在右臂上。她雪白的手臂修长而秀美,上面有一个牛痘的疤痕和一条一寸多长的青蛇。她银白的指甲就落在那条青蛇上,阳光下她的指甲成了一个银光闪闪的亮点。我对阿娇的这个决...阿娇告诉我她要离开这个城市,说这话时她的一个指头无意识地点在右臂上。她雪白的手臂修长而秀美,上面有一个牛痘的疤痕和一条一寸多长的青蛇。她银白的指甲就落在那条青蛇上,阳光下她的指甲成了一个银光闪闪的亮点。我对阿娇的这个决定感到很突然,一时说不上话。阿娇穿的是一件大 T 恤,很长,一直拖到大腿根,以至把她短短的牛仔裤衩都覆盖了,下面是她丰满而白皙的大腿。展开更多
基金the National Key Foundation for Exploring Scientific Instruments of China(No.2012YQ24012705)the National Natural Science Foundation of China(No.51174113)+2 种基金the special fund for Scientific Research Institutes of China(Nos.2013EG122192 and 2014EG122293)CCTEG Innovation Foundation of China(No. 2014MS030)Shenhua Innovation Foundation of China(No. SHGF-13-07)
文摘In order to investigate the characteristics of re-oxidation of residual coal in goafs in close coal seam mining,scanning electron microscope and infrared spectrometer are used to study the changes of coal microstructure and chemical reaction of functional groups of eight coal samples at different ranks.Result shows that after initial oxidation,the surface morphology of pore are different,and the porosity of coal is increased and the oxygen adsorption capacity of coal is improved.The change of coal molecular structure and presence of a large amount of active oxygen-containing functional groups lead to increasing tendency of coal to further oxidation.In addition,the higher lever of the initial oxidation is,the easier the re-oxidation occurs.
文摘Septoria carvi belong to the fungi recently detected on caraway plants in the Polish climatic conditions. In many European countries, this fungus causes significant losses in caraway cultivation and decreases the quality and quantity of the herb material. The aim of the present work was to study the fungus harmfulness towards the sowing materials, stems, leaves and umbels of caraway. The pathogenicity tests according to Koch's postulates were carried out for isolates ofS. carvi using post-culture liquids and a water suspension of conidia to inoculate the plants' parts. The studies were conducted in the laboratory, the climatic chamber and in field conditions. S. carvi caused disease symptoms in the form of spots and necrosis on all tested plants organs. The infection was followed by natural openings what was shown by scanning electron microscope (SEM) microscopic observations. The efficiency of inoculation increased injuries and anatomical dipping of plant epidermal tissue. The study showed the ability for asymptomatic S. carvi colonization of inoculated plants' parts. The performed pathogenicity tests and microscopic observations SEM showed that the tested isolates of S. carvi were occasional pathogens of caraway.
基金Project(51474253)supported by the National Natural Science Foundation of China。
文摘The surface hydrophobization and flotation of a xanthate−hydroxamate collector toward copper oxide mineral were compared with the combined collectors of xanthate and hydroxamate through water contact angle(WCA)and micro-flotation experiments.The results showed that S-[(2-hydroxyamino)-2-oxoethyl]-O-octyl-dithiocarbonate ester(HAOODE)exhibited stronger hydrophobization and better flotation performance to malachite(Cu2(OH)2CO3)than octyl-hydroxamic acid(OHA)and its combination with S-allyl-O-ethyl xanthate ester(AEXE).To understand the hydrophobic intensification mechanism of HAOODE to malachite,zeta potential,atomic force microscopy(AFM)and XPS measurements were carried out.The results recommended that malachite chemisorbed HAOODE to form Cu—HAOODE complexes in which the hydroxamate—(O,O)—Cu and—O—C(—S—Cu)—S—configurations co-existed.The co-adsorption of HAOODE’s hetero-difunctional groups was more stable than the single-functionalgroup adsorption of OHA and AEXE,which produced the“loop”structure and intensified the self-assembly alignment of HAOODE on malachite surfaces.In addition,the“h”shape steric orientation of the double hydrophobic groups in HAOODE facilitated stronger hydrophobization toward malachite than the“line”or“V”hydrophobic carbon chains of OHA or AEXE.Thus,HAOODE achieved the preferable flotation recovery of malachite particles in comparison with OHA and AEXE.
文摘阿娇告诉我她要离开这个城市,说这话时她的一个指头无意识地点在右臂上。她雪白的手臂修长而秀美,上面有一个牛痘的疤痕和一条一寸多长的青蛇。她银白的指甲就落在那条青蛇上,阳光下她的指甲成了一个银光闪闪的亮点。我对阿娇的这个决定感到很突然,一时说不上话。阿娇穿的是一件大 T 恤,很长,一直拖到大腿根,以至把她短短的牛仔裤衩都覆盖了,下面是她丰满而白皙的大腿。