Producer gas through gasification of biomass can be used as an alternate fuel in rural areas due to high potential of biomass resources in India.Experiments were conducted to study the performance of a diesel engine(f...Producer gas through gasification of biomass can be used as an alternate fuel in rural areas due to high potential of biomass resources in India.Experiments were conducted to study the performance of a diesel engine(four stroke,single cylinder,5.25 kW) with respect to its thermal efficiency,specific fuel consumption and diesel substitution by use of diesel alone and producer gas-cum-diesel(dual fuel mode).Three types of biomass,i.e.wood chips,pigeon pea stalks and corn cobs were used for generation of producer gas.A producer gas system consisting of a downdraft gasifier,a cooling cum cleaning unit,a filtering unit and a gas air mixing device was designed,fabricated and used to power a 5.25 kW diesel engine on dual fuel mode.Performance of the engine was reported by keeping biomass moisture contents as 8%,12%,16%,and 21%,engine speed as 1 600 r/min and with variable engine loads.The average value of thermal efficiency on dual fuel mode was found slightly lower than that of diesel mode.The specific diesel consumption was found to be 60%-64% less in dual fuel mode than that in diesel mode for the same amount of energy output.The average diesel substitution of 74% was observed with wood chips followed by corn cobs(78%) and pigeon pea stalks(82%).Based on the performance studied,the producer gas may be used as a substitute or as supplementary fuel for diesel conservation,particularly for stationary engines in agricultural operations in the farm.展开更多
Objective: In order to coordinately express amarker gene and therapeutic genes in one vector, apolycistronic retroviral vector was constructed withthe internal ribosome entry site from encephalo-myocarditis and polio ...Objective: In order to coordinately express amarker gene and therapeutic genes in one vector, apolycistronic retroviral vector was constructed withthe internal ribosome entry site from encephalo-myocarditis and polio virus, which was able to expressthree different genes simultaneously. Methods: Thevector used mouse moloney leukemia virus sequencesfor viral expression and packaging functions展开更多
Since 1980, many Chinese scientists haveinvestigated the somatic cell therapy and started thebasic research on gene therapy. From 1990’ s, someimportant advances in gene therapy research havebeen achieved in China. F...Since 1980, many Chinese scientists haveinvestigated the somatic cell therapy and started thebasic research on gene therapy. From 1990’ s, someimportant advances in gene therapy research havebeen achieved in China. For example, the clinicaltrial of hemophilia B was approved in China andpublished in Human Gene Therapy. Many originalpapers have been published in the internationaljournals. Many gene therapy research projects havebeen funded by the National N atural ScienceFoundation and National High BiotechnologyFoundation. The National High BiotechnologyFoundation has supportcd 10 gene therapy展开更多
A method was established for the analysis of omethoate and it’s concomitants and decomposed product in biological samples by GC-MS.This method is rapid,reliable and accurate.
The heterosis in cotton is much significant,especially in increasing yield andfiber quality.Comparing with hand-emasculation andpollination,and genetic male sterile lines,utilization of CMS lines is much more effectiv...The heterosis in cotton is much significant,especially in increasing yield andfiber quality.Comparing with hand-emasculation andpollination,and genetic male sterile lines,utilization of CMS lines is much more effectiveand economical in producing commercial hybridseeds.Since 1965 in the world,several CMSlines have been developed,such as CMS展开更多
Since the founding of Beijing Forestry University(formerly BeijingForestry College)forty years ago it has undergone difficulties and hardshipsbut by insisting on the principle of producing both personnel and research ...Since the founding of Beijing Forestry University(formerly BeijingForestry College)forty years ago it has undergone difficulties and hardshipsbut by insisting on the principle of producing both personnel and research find-ings for the forest construction in China scientific research has been placed in amost important position. In 1952,at the beginning of the University’s establishment,all teachersand students were engaged in teaching and learning and administrative展开更多
The effect of temperature and metal ion components on the viscosity of HPAM solution was studied by means of orthogonal method.Five factors and 4 levels were considered for the orthogonal design.The five factors inclu...The effect of temperature and metal ion components on the viscosity of HPAM solution was studied by means of orthogonal method.Five factors and 4 levels were considered for the orthogonal design.The five factors included temperature,contents of Na+,Mg2+,Ca2+ and S2-,and the four levels mainly considered the level of produced water components in main oilfields in China.The experiment results show that temperature is the most important factor to control HPAM solution viscosity prepared by produced water.The effect of ions was in order of Na+>S2->Mg2+>Ca2+.The mechanism of each factor influencing viscosity was also discussed.Based on the actual condition of Nanyang oilfield,the desulfurization was used to improve the solution viscosity,and satisfactory result was obtained.展开更多
To apply gene therapy to breast carcinoma wepropose a model for in vitro gene transfer of the herpessimplex thymidine kinase (HSV-tk) gene using Stkvector-producing cells. In this study the HSV-tk gene wastransferred ...To apply gene therapy to breast carcinoma wepropose a model for in vitro gene transfer of the herpessimplex thymidine kinase (HSV-tk) gene using Stkvector-producing cells. In this study the HSV-tk gene wastransferred to mouse mammary carcinoma cell line 4Tlwith the method of infection. The HSV-tk gene in thegenome of transduced cells (4Tl/tk) was demonstratedby the method of DNA-PCR. Using a modified展开更多
Stem cell factor (SCF) is a novel growth factor thatinfluences the growth and development of hematopoieticcells, germ cells and melanocytes. To explore
Prestressed concrete structures are main conformati on for the construction of high way bridges. The quality of prestressed concrete s tructures is mainly affected by the tensile strength of prestressing strand. In or...Prestressed concrete structures are main conformati on for the construction of high way bridges. The quality of prestressed concrete s tructures is mainly affected by the tensile strength of prestressing strand. In order to attain the purpose of economic design and long life span of prestressin g strand, the less relaxation property of strand type is suitable for constructi on and usage. Thus, the research and development of prestressing strand is requi red to reach the goals of high tensile strength and low relaxation. To ensure th e required quality of prestressing strand, the strand pull test and long period relaxation test are two important items for the quality assurance. There are thr ee specific items of the tensile strength test are belong to larger-the-better quality type. The quality type of smaller-the-better is for the long period r elaxation test. However, many existing methods are able to measure process capab ility for product with single quality characteristic and cannot be applied to mo st products with multiple properties. Thus, the indices of C pu and C pl, for larger-the-better and smaller-the-better quality type respec tively proposed by Kane, are quoted and combined to propose a new index to evalu ate the quality of multiple characteristics of prestressing strand in this paper . Then, the principle of statistics is used to derive the one-to-one mathemati cal relationship of this new index and ratio of tallied. Finally, the procedure and criteria to evaluate the quality of prestressing strand is proposed. This in tegrated multi-quality property capability analysis model can be used to evalua te the multi-process capabilities and provide continuous improvement on manufac turing process of prestressing strand.展开更多
文摘Producer gas through gasification of biomass can be used as an alternate fuel in rural areas due to high potential of biomass resources in India.Experiments were conducted to study the performance of a diesel engine(four stroke,single cylinder,5.25 kW) with respect to its thermal efficiency,specific fuel consumption and diesel substitution by use of diesel alone and producer gas-cum-diesel(dual fuel mode).Three types of biomass,i.e.wood chips,pigeon pea stalks and corn cobs were used for generation of producer gas.A producer gas system consisting of a downdraft gasifier,a cooling cum cleaning unit,a filtering unit and a gas air mixing device was designed,fabricated and used to power a 5.25 kW diesel engine on dual fuel mode.Performance of the engine was reported by keeping biomass moisture contents as 8%,12%,16%,and 21%,engine speed as 1 600 r/min and with variable engine loads.The average value of thermal efficiency on dual fuel mode was found slightly lower than that of diesel mode.The specific diesel consumption was found to be 60%-64% less in dual fuel mode than that in diesel mode for the same amount of energy output.The average diesel substitution of 74% was observed with wood chips followed by corn cobs(78%) and pigeon pea stalks(82%).Based on the performance studied,the producer gas may be used as a substitute or as supplementary fuel for diesel conservation,particularly for stationary engines in agricultural operations in the farm.
文摘Objective: In order to coordinately express amarker gene and therapeutic genes in one vector, apolycistronic retroviral vector was constructed withthe internal ribosome entry site from encephalo-myocarditis and polio virus, which was able to expressthree different genes simultaneously. Methods: Thevector used mouse moloney leukemia virus sequencesfor viral expression and packaging functions
文摘Since 1980, many Chinese scientists haveinvestigated the somatic cell therapy and started thebasic research on gene therapy. From 1990’ s, someimportant advances in gene therapy research havebeen achieved in China. For example, the clinicaltrial of hemophilia B was approved in China andpublished in Human Gene Therapy. Many originalpapers have been published in the internationaljournals. Many gene therapy research projects havebeen funded by the National N atural ScienceFoundation and National High BiotechnologyFoundation. The National High BiotechnologyFoundation has supportcd 10 gene therapy
文摘A method was established for the analysis of omethoate and it’s concomitants and decomposed product in biological samples by GC-MS.This method is rapid,reliable and accurate.
文摘The heterosis in cotton is much significant,especially in increasing yield andfiber quality.Comparing with hand-emasculation andpollination,and genetic male sterile lines,utilization of CMS lines is much more effectiveand economical in producing commercial hybridseeds.Since 1965 in the world,several CMSlines have been developed,such as CMS
文摘Since the founding of Beijing Forestry University(formerly BeijingForestry College)forty years ago it has undergone difficulties and hardshipsbut by insisting on the principle of producing both personnel and research find-ings for the forest construction in China scientific research has been placed in amost important position. In 1952,at the beginning of the University’s establishment,all teachersand students were engaged in teaching and learning and administrative
基金Project(2007AA06Z214) supported by the National High-Tech Research and Development Program of ChinaProject(ts20070704) supported by Taishan Scholars Construction EngineeringProject(200873181) supported by National Natural Science Foundation of China
文摘The effect of temperature and metal ion components on the viscosity of HPAM solution was studied by means of orthogonal method.Five factors and 4 levels were considered for the orthogonal design.The five factors included temperature,contents of Na+,Mg2+,Ca2+ and S2-,and the four levels mainly considered the level of produced water components in main oilfields in China.The experiment results show that temperature is the most important factor to control HPAM solution viscosity prepared by produced water.The effect of ions was in order of Na+>S2->Mg2+>Ca2+.The mechanism of each factor influencing viscosity was also discussed.Based on the actual condition of Nanyang oilfield,the desulfurization was used to improve the solution viscosity,and satisfactory result was obtained.
文摘To apply gene therapy to breast carcinoma wepropose a model for in vitro gene transfer of the herpessimplex thymidine kinase (HSV-tk) gene using Stkvector-producing cells. In this study the HSV-tk gene wastransferred to mouse mammary carcinoma cell line 4Tlwith the method of infection. The HSV-tk gene in thegenome of transduced cells (4Tl/tk) was demonstratedby the method of DNA-PCR. Using a modified
文摘Stem cell factor (SCF) is a novel growth factor thatinfluences the growth and development of hematopoieticcells, germ cells and melanocytes. To explore
文摘Prestressed concrete structures are main conformati on for the construction of high way bridges. The quality of prestressed concrete s tructures is mainly affected by the tensile strength of prestressing strand. In order to attain the purpose of economic design and long life span of prestressin g strand, the less relaxation property of strand type is suitable for constructi on and usage. Thus, the research and development of prestressing strand is requi red to reach the goals of high tensile strength and low relaxation. To ensure th e required quality of prestressing strand, the strand pull test and long period relaxation test are two important items for the quality assurance. There are thr ee specific items of the tensile strength test are belong to larger-the-better quality type. The quality type of smaller-the-better is for the long period r elaxation test. However, many existing methods are able to measure process capab ility for product with single quality characteristic and cannot be applied to mo st products with multiple properties. Thus, the indices of C pu and C pl, for larger-the-better and smaller-the-better quality type respec tively proposed by Kane, are quoted and combined to propose a new index to evalu ate the quality of multiple characteristics of prestressing strand in this paper . Then, the principle of statistics is used to derive the one-to-one mathemati cal relationship of this new index and ratio of tallied. Finally, the procedure and criteria to evaluate the quality of prestressing strand is proposed. This in tegrated multi-quality property capability analysis model can be used to evalua te the multi-process capabilities and provide continuous improvement on manufac turing process of prestressing strand.
