After gas drainage, the outburst seam is dry and, consequently, during subsequent mechanized mining, unwanted dust production is extensive. Because the hard dustfall typically has a small particle size it contains a h...After gas drainage, the outburst seam is dry and, consequently, during subsequent mechanized mining, unwanted dust production is extensive. Because the hard dustfall typically has a small particle size it contains a high percentage of respirable dust. Considering these factors, this paper improved the efficiency of dustfall by reducing the surface tension of the liquid used as a wetting agent, then configuring five kinds of wetting agents by adopting various doses and types of surfactants, neutral inorganic salts and chemical additives, etc. After purchasing DA-85 and SRJ-1 wetting agent, the surface tension and critical micelle concentration of seven kinds of wetting agents were measured using the capillary rise method. Wetting agent A was confirmed to have the best comprehensive effect. The experiments were optimized by measuring and comparatively analyzing contact angles of pure water, SRJ-1 wetting agent and wetting agent A on the surface of different coal samples using a contact angle measurement instrument （HARKE- SPCA）. By comparative analysis, dust-proof effects of seam, dynamic pressure water infusion and high- pressure spray in the tunneling face at the Daning coal mine using pure water, wetting agent SRJ-1 and A, it was determined that after using wetting agent A, the average dust concentration in the place of the mining machine driver, 10 m and 110 m away from the tunneling front is approximately 300 rag/ m^3, 240 mg/m^3 and 100 mg/m^3, respectively, This practice increased the dust-proof efficiency dramati- cally and achieved a good comprehensive dust-proof effect.展开更多
The notion of strongly W-Gorenstein complexes is introduced for a self-orthogonal class W of modules. We obtain a characterization of such complexes and apply to strongly Gorenstein injective complexes.
The notion of DG-Gorenstein injective complexes is studied in this article.It is shown that a complex G is DG-Gorenstein injective if and only if G is exact with Z_(n)(G)Gorenstein injective in R-Mod for each n∈Zand ...The notion of DG-Gorenstein injective complexes is studied in this article.It is shown that a complex G is DG-Gorenstein injective if and only if G is exact with Z_(n)(G)Gorenstein injective in R-Mod for each n∈Zand any morphism f:E→G is null homotopic whenever E is a DG-injective complex.展开更多
The 100 patients with fallopian tube obstruction were firstly treated by catheter recanaliza-tion, and then randomiy divided into two groups : Chinese medicine group (CMG) was treated with Tongjing-bao (痛经宝) and An...The 100 patients with fallopian tube obstruction were firstly treated by catheter recanaliza-tion, and then randomiy divided into two groups : Chinese medicine group (CMG) was treated with Tongjing-bao (痛经宝) and Angelicae Complex Injection, and Western medicine group (WMG) as the control wastreated with gentamycin, dexamethasone and Cliotrypsin. The course of the treatment was three months andliemorlieology change was analysed before and atter the treatment. After the above treatment , hystero salp-ingography was again performed on all patients except those with subsequent pregnancy . The results showedtliat the effective rate of catheter recanalization was 94% , and the pregnancy rate was 30% in CMG and16% in WMG (P<0. 05) . The reocclusion rate of fallopian tube was 9. 3% in CMG and 29. 9% in WMG (P<0. 05) . The difference of hemorheology change was significant between the two groups (P< 0. 01 ) andbetween betore and atter treatment in CMG (P< 0 . 01 ) . This study showed that catheter recanalization waseffective in mechanically recanalizing the occluded tallopian tube and that the Chinese medicine used in thetreatment effective in lowing tlie concentration of blood and thus inhibiting the reocclusion and re-adhesion ofthe fallopian tube.展开更多
In this paper,we give a relationship between projective generators（resp.,injective cogenerators） in the category of R-modules and the counterparts in the category of complexes of R-modules.As a consequence,we get th...In this paper,we give a relationship between projective generators（resp.,injective cogenerators） in the category of R-modules and the counterparts in the category of complexes of R-modules.As a consequence,we get that complexes of W^--Gorenstein modules are actually W-Gorenstein complexes whenever W is a subcategory of R-modules satisfying W⊥W,where W^- is the subcategory of exact complexes with all cycles in W.We also study when all cycles of a W-Gorenstein complexes are W^--Gorenstein modules.展开更多
基金partly supported by the National Natural Science Foundation of China (No.51404263)the National Natural Science Foundation of Jiangsu Province (No.BK20130203)+3 种基金the Coal Mine Joint Funds of the National Natural Science Foundation of China (No.51134023)the State Key Laboratory Cultivation Base for Gas Geology and Gas Control (No.WS2013A05)the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)the independent study for State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology (No.SKLCRSM09X04)
文摘After gas drainage, the outburst seam is dry and, consequently, during subsequent mechanized mining, unwanted dust production is extensive. Because the hard dustfall typically has a small particle size it contains a high percentage of respirable dust. Considering these factors, this paper improved the efficiency of dustfall by reducing the surface tension of the liquid used as a wetting agent, then configuring five kinds of wetting agents by adopting various doses and types of surfactants, neutral inorganic salts and chemical additives, etc. After purchasing DA-85 and SRJ-1 wetting agent, the surface tension and critical micelle concentration of seven kinds of wetting agents were measured using the capillary rise method. Wetting agent A was confirmed to have the best comprehensive effect. The experiments were optimized by measuring and comparatively analyzing contact angles of pure water, SRJ-1 wetting agent and wetting agent A on the surface of different coal samples using a contact angle measurement instrument （HARKE- SPCA）. By comparative analysis, dust-proof effects of seam, dynamic pressure water infusion and high- pressure spray in the tunneling face at the Daning coal mine using pure water, wetting agent SRJ-1 and A, it was determined that after using wetting agent A, the average dust concentration in the place of the mining machine driver, 10 m and 110 m away from the tunneling front is approximately 300 rag/ m^3, 240 mg/m^3 and 100 mg/m^3, respectively, This practice increased the dust-proof efficiency dramati- cally and achieved a good comprehensive dust-proof effect.
基金Supported by the National Natural Science Foundation of China(Grant No.11501451)The Fund for Talent Introduction of Northwest Minzu University(Grant No.xbmuyjrc201406)
文摘The notion of strongly W-Gorenstein complexes is introduced for a self-orthogonal class W of modules. We obtain a characterization of such complexes and apply to strongly Gorenstein injective complexes.
基金This work was supported by the National Natural Science Foundation of China(grant no.11501451)the Funds for Talent Introduction of Northwest Minzu University(grant no.XBMUYJRC201406).
文摘The notion of DG-Gorenstein injective complexes is studied in this article.It is shown that a complex G is DG-Gorenstein injective if and only if G is exact with Z_(n)(G)Gorenstein injective in R-Mod for each n∈Zand any morphism f:E→G is null homotopic whenever E is a DG-injective complex.
文摘The 100 patients with fallopian tube obstruction were firstly treated by catheter recanaliza-tion, and then randomiy divided into two groups : Chinese medicine group (CMG) was treated with Tongjing-bao (痛经宝) and Angelicae Complex Injection, and Western medicine group (WMG) as the control wastreated with gentamycin, dexamethasone and Cliotrypsin. The course of the treatment was three months andliemorlieology change was analysed before and atter the treatment. After the above treatment , hystero salp-ingography was again performed on all patients except those with subsequent pregnancy . The results showedtliat the effective rate of catheter recanalization was 94% , and the pregnancy rate was 30% in CMG and16% in WMG (P<0. 05) . The reocclusion rate of fallopian tube was 9. 3% in CMG and 29. 9% in WMG (P<0. 05) . The difference of hemorheology change was significant between the two groups (P< 0. 01 ) andbetween betore and atter treatment in CMG (P< 0 . 01 ) . This study showed that catheter recanalization waseffective in mechanically recanalizing the occluded tallopian tube and that the Chinese medicine used in thetreatment effective in lowing tlie concentration of blood and thus inhibiting the reocclusion and re-adhesion ofthe fallopian tube.
基金Supported by National Natural Science Foundation of China(Grant Nos.11301240,11371187 and 11101197)the Young Scholars Science Foundation of Lanzhou Jiaotong University(Grant No.2012020)
文摘In this paper,we give a relationship between projective generators（resp.,injective cogenerators） in the category of R-modules and the counterparts in the category of complexes of R-modules.As a consequence,we get that complexes of W^--Gorenstein modules are actually W-Gorenstein complexes whenever W is a subcategory of R-modules satisfying W⊥W,where W^- is the subcategory of exact complexes with all cycles in W.We also study when all cycles of a W-Gorenstein complexes are W^--Gorenstein modules.
