This paper proposed a new libration decoupling analytical speed function(LD-ASF)in lieu of the classic analytical speed function to control the climber's speed along a partial space elevator to improve libration s...This paper proposed a new libration decoupling analytical speed function(LD-ASF)in lieu of the classic analytical speed function to control the climber's speed along a partial space elevator to improve libration stability in cargo transportation.The LD-ASF is further optimized for payload transportation efficiency by a novel coordinate game theory to balance competing control objectives among payload transport speed,stable end body's libration,and overall control input via model predictive control.The transfer period is divided into several sections to reduce computational burden.The validity and efficacy of the proposed LD-ASF and coordinate game-based model predictive control are demonstrated by computer simulation.Numerical results reveal that the optimized LD-ASF results in higher transportation speed,stable end body's libration,lower thrust fuel consumption,and more flexible optimization space than the classic analytical speed function.展开更多
Na2SiO3 and Na2SeO3 were chosen as stable reagents of alkaline thiourea solution substituting Na2SO3, according to the structure-property relationship between the stability of alkaline thiourea and the structure of th...Na2SiO3 and Na2SeO3 were chosen as stable reagents of alkaline thiourea solution substituting Na2SO3, according to the structure-property relationship between the stability of alkaline thiourea and the structure of thiourea and sulfite ion, and the effect of the stable reagents on stability of alkaline thiourea was investigated. The results show that contrary to Na2SeO3, Na2SO3 and Na2SiO3 affect the stability of alkaline thiourea solution remarkably. The stable effect of Na2SiO3 on alkaline thiourea is obviously better than that of Na2SO3. The stable reagents Na2SO3 and Na2SiO3 decrease the decomposition rate of alkaline thiourea solution greatly, and the decomposition rate of alkaline thiourea reduces from （72.5%） to （33.8%） with addition of (0.3 mol·L-1) Na2SiO3. Dissolution currents of gold in the alkaline thiourea solution containing Na2SO3 and Na2SiO3 are （2.0） (mA·cm-2) and （3.5） (mA·cm-2) at the potential of 0.42 V, respectively, and Na2SO3 is consumed excessively due to the oxidation reaction of Na2SO3 occurring in the studied potential range. Na2SiO3 is an efficient stable reagent of alkaline thiourea solution, and gold dissolution is accelerated much more obviously by Na2SiO3 than by Na2SO3.展开更多
A single bubble trapped at an antinode of an acoustic standing wave field in water can emit 50ps-140ps light pulses, called “single bubble sonoluminescence” (SBSL). It arouses much interest in physical acoustics bec...A single bubble trapped at an antinode of an acoustic standing wave field in water can emit 50ps-140ps light pulses, called “single bubble sonoluminescence” (SBSL). It arouses much interest in physical acoustics because of its highly non-linear characteristics, high concentration of energy, and stable cavitation behavior. In this paper, bubble stability, the dynamic behavior of bubbles, non-invasive measurement of driving acoustic pressure and Mie scattering method are introduced.展开更多
An online method using continuous flow isotope ratio mass spectrometry （CF-IRMS） interfaced with a Gasbench Ⅱ was presented to determine chlorine stable isotope composition. Silver chloride （AgCl） was quantitativ...An online method using continuous flow isotope ratio mass spectrometry （CF-IRMS） interfaced with a Gasbench Ⅱ was presented to determine chlorine stable isotope composition. Silver chloride （AgCl） was quantitatively derived from chloride by using silver nitrate （AgNO3）, and then was reacted with iodomethane （CH3Ⅰ） to produce methyl chloride （CH3Cl）. A GasBench Ⅱ equipped with a PoraPlot Q column was used to separate CH3Cl from any other gas species. Finally, chlorine stable isotope analysis was carried out on CH3Cl introduced to the IRMS in a helium stream via an active open split. The minimum amount of Cl used in this method is of the order of 1.4 μmol. Inter-laboratory and inter-technique comparisons show that the total uncertainty incorporating both the precision and accuracy of this method is better than 0.007%. Furthermore, ten seawaters sampled from different locations have a narrow δ37Cl value range from -0.008% to 0.010%, with a mean value of （0.000±0.006）%. This supports the assumption that any seawater can be representative of standard mean ocean chloride （SMOC） and used as an international reference material.展开更多
Continuous precipitation was sampled at several stations in the southern Tibetan plateau to study the variation of stable isotope in precipitation. Our work shows that there is a strong signal of monsoon precipitation...Continuous precipitation was sampled at several stations in the southern Tibetan plateau to study the variation of stable isotope in precipitation. Our work shows that there is a strong signal of monsoon precipitation in the stable isotope of precipitation, which is quite different from that in other regions in the Tibetan plateau. The spatial variation, the seasonal variation of δ 18 O and the relationship between δ 18 O in precipitation and local meteorological parameters are all affected by monsoon precipitation in the south of Tibetan plateau.From the spatial variation, precipitation samples were collected from a dozen stations from south to north of the Tibetan plateau. A strong spatial variation of stable isotope in precipitation has been found. Extremely low value of δ 18 O in precipitation in the south of Tibetan plateau can be seen which can be contributed to the monsoon precipitation in the south of Tibetan plateau. The strong precipitation in the south slope of Himalayas Mts. depleted heavily the heavy stable isotope which resulting in very low δ 18 O in precipitation in the south of Tibetan plateau. This work also shows that the monsoon precipitation can affect effectively as far as to the Tanggula Mts. in the middle of the Tibetan plateau.展开更多
Physiological and genetic variations exist richlyin the cotton plants regenerated from somaticembryo.A stable homeotic variant(chvl)ofcotton from regenerated plants was identified.Using light microscope and scanning e...Physiological and genetic variations exist richlyin the cotton plants regenerated from somaticembryo.A stable homeotic variant(chvl)ofcotton from regenerated plants was identified.Using light microscope and scanning electronmicroscope to investigate the morphologicalchanges in chvl,the results revealed that all thefloral organs in the chvl plants converted展开更多
Highly efficient and low-cost halide perovskite solar cells(PSCs)have attracted great attention over the last few years as one of the most promising photovoltaic(PV)technologies.Yet,to gauge the technical feasibility ...Highly efficient and low-cost halide perovskite solar cells(PSCs)have attracted great attention over the last few years as one of the most promising photovoltaic(PV)technologies.Yet,to gauge the technical feasibility for commercialization of PV technologies,the long-term stability of PSCs is still a challenge that must be addressed[1].展开更多
The alpha stable self-similar stochastic process has been proved an effective model for high variable data traffic. A deep insight into some special issues and considerations on use of the process to model aggregated ...The alpha stable self-similar stochastic process has been proved an effective model for high variable data traffic. A deep insight into some special issues and considerations on use of the process to model aggregated VBR video traffic is made. Different methods to estimate stability parameter a and self-similar parameter H are compared. Processes to generate the linear fractional stable noise （LFSN） and the alpha stable random variables are provided. Model construction and the quantitative comparisons with fractional Brown motion （FBM） and real traffic are also examined. Open problems and future directions are also given with thoughtful discussions.展开更多
The paper aimed at constructing the eukaryotic expression vector of CecropinB and transfecting it into the goat mammary epithelial cell line. The recombinant plasmid inserted with CecropinB was transfected into the go...The paper aimed at constructing the eukaryotic expression vector of CecropinB and transfecting it into the goat mammary epithelial cell line. The recombinant plasmid inserted with CecropinB was transfected into the goat mammary epithelial cell by liposome Tfx^M-20. By screening with G418, the stable transfected goat mammary epithelial cell line was established and the transcription and expression of CecropinB were identified by RT-PCR and agarose diffusion experiment, respectively. Results showed that eukaryotic expression vector pECFP-B was constructed successfully. Stable transfected goat mammary epithelial cell line was established and the CecropinB protein was expressed successfully. It provides the solid foundation for further experimental studies on the function of CecropinB.展开更多
The question of stable control system of bank-to-turn (BTT) missiles is a bottleneckin BTT technology. Integrate fuzzy logic stable control system of BTT missiles is designed in whichthree main problems are resolved. ...The question of stable control system of bank-to-turn (BTT) missiles is a bottleneckin BTT technology. Integrate fuzzy logic stable control system of BTT missiles is designed in whichthree main problems are resolved. How to select input variables Of the fuzzy logic controller and howto guarantee completeness of the output control are two of them. The last one is how to coordinatethe fuzzy logic controllers in integrate fuzzy logic stable control system. Simulating results prov that integrate fuzzy logic stable coatrol system of BTT missiles is sueccessful, and it can be widelyused in future.展开更多
基金funded by the National Natural Science Foundation of China(12102487)Basic and Applied Basic Research Foundation of Guangdong Province,China(2023A1515012339)+1 种基金Shenzhen Science and Technology Program(ZDSYS20210623091808026)the Discovery Grant(RGPIN-2024-06290)of the Natural Sciences and Engineering Research Council of Canada。
文摘This paper proposed a new libration decoupling analytical speed function(LD-ASF)in lieu of the classic analytical speed function to control the climber's speed along a partial space elevator to improve libration stability in cargo transportation.The LD-ASF is further optimized for payload transportation efficiency by a novel coordinate game theory to balance competing control objectives among payload transport speed,stable end body's libration,and overall control input via model predictive control.The transfer period is divided into several sections to reduce computational burden.The validity and efficacy of the proposed LD-ASF and coordinate game-based model predictive control are demonstrated by computer simulation.Numerical results reveal that the optimized LD-ASF results in higher transportation speed,stable end body's libration,lower thrust fuel consumption,and more flexible optimization space than the classic analytical speed function.
文摘Na2SiO3 and Na2SeO3 were chosen as stable reagents of alkaline thiourea solution substituting Na2SO3, according to the structure-property relationship between the stability of alkaline thiourea and the structure of thiourea and sulfite ion, and the effect of the stable reagents on stability of alkaline thiourea was investigated. The results show that contrary to Na2SeO3, Na2SO3 and Na2SiO3 affect the stability of alkaline thiourea solution remarkably. The stable effect of Na2SiO3 on alkaline thiourea is obviously better than that of Na2SO3. The stable reagents Na2SO3 and Na2SiO3 decrease the decomposition rate of alkaline thiourea solution greatly, and the decomposition rate of alkaline thiourea reduces from （72.5%） to （33.8%） with addition of (0.3 mol·L-1) Na2SiO3. Dissolution currents of gold in the alkaline thiourea solution containing Na2SO3 and Na2SiO3 are （2.0） (mA·cm-2) and （3.5） (mA·cm-2) at the potential of 0.42 V, respectively, and Na2SO3 is consumed excessively due to the oxidation reaction of Na2SO3 occurring in the studied potential range. Na2SiO3 is an efficient stable reagent of alkaline thiourea solution, and gold dissolution is accelerated much more obviously by Na2SiO3 than by Na2SO3.
文摘A single bubble trapped at an antinode of an acoustic standing wave field in water can emit 50ps-140ps light pulses, called “single bubble sonoluminescence” (SBSL). It arouses much interest in physical acoustics because of its highly non-linear characteristics, high concentration of energy, and stable cavitation behavior. In this paper, bubble stability, the dynamic behavior of bubbles, non-invasive measurement of driving acoustic pressure and Mie scattering method are introduced.
基金Projects(40772156, 41072179) supported by the National Natural Science Foundation of China
文摘An online method using continuous flow isotope ratio mass spectrometry （CF-IRMS） interfaced with a Gasbench Ⅱ was presented to determine chlorine stable isotope composition. Silver chloride （AgCl） was quantitatively derived from chloride by using silver nitrate （AgNO3）, and then was reacted with iodomethane （CH3Ⅰ） to produce methyl chloride （CH3Cl）. A GasBench Ⅱ equipped with a PoraPlot Q column was used to separate CH3Cl from any other gas species. Finally, chlorine stable isotope analysis was carried out on CH3Cl introduced to the IRMS in a helium stream via an active open split. The minimum amount of Cl used in this method is of the order of 1.4 μmol. Inter-laboratory and inter-technique comparisons show that the total uncertainty incorporating both the precision and accuracy of this method is better than 0.007%. Furthermore, ten seawaters sampled from different locations have a narrow δ37Cl value range from -0.008% to 0.010%, with a mean value of （0.000±0.006）%. This supports the assumption that any seawater can be representative of standard mean ocean chloride （SMOC） and used as an international reference material.
文摘Continuous precipitation was sampled at several stations in the southern Tibetan plateau to study the variation of stable isotope in precipitation. Our work shows that there is a strong signal of monsoon precipitation in the stable isotope of precipitation, which is quite different from that in other regions in the Tibetan plateau. The spatial variation, the seasonal variation of δ 18 O and the relationship between δ 18 O in precipitation and local meteorological parameters are all affected by monsoon precipitation in the south of Tibetan plateau.From the spatial variation, precipitation samples were collected from a dozen stations from south to north of the Tibetan plateau. A strong spatial variation of stable isotope in precipitation has been found. Extremely low value of δ 18 O in precipitation in the south of Tibetan plateau can be seen which can be contributed to the monsoon precipitation in the south of Tibetan plateau. The strong precipitation in the south slope of Himalayas Mts. depleted heavily the heavy stable isotope which resulting in very low δ 18 O in precipitation in the south of Tibetan plateau. This work also shows that the monsoon precipitation can affect effectively as far as to the Tanggula Mts. in the middle of the Tibetan plateau.
文摘Physiological and genetic variations exist richlyin the cotton plants regenerated from somaticembryo.A stable homeotic variant(chvl)ofcotton from regenerated plants was identified.Using light microscope and scanning electronmicroscope to investigate the morphologicalchanges in chvl,the results revealed that all thefloral organs in the chvl plants converted
文摘Highly efficient and low-cost halide perovskite solar cells(PSCs)have attracted great attention over the last few years as one of the most promising photovoltaic(PV)technologies.Yet,to gauge the technical feasibility for commercialization of PV technologies,the long-term stability of PSCs is still a challenge that must be addressed[1].
文摘The alpha stable self-similar stochastic process has been proved an effective model for high variable data traffic. A deep insight into some special issues and considerations on use of the process to model aggregated VBR video traffic is made. Different methods to estimate stability parameter a and self-similar parameter H are compared. Processes to generate the linear fractional stable noise （LFSN） and the alpha stable random variables are provided. Model construction and the quantitative comparisons with fractional Brown motion （FBM） and real traffic are also examined. Open problems and future directions are also given with thoughtful discussions.
基金Supported by Key Teachers Foundation of Education Office of Heilongjiang Province, 2005 (1055G005)
文摘The paper aimed at constructing the eukaryotic expression vector of CecropinB and transfecting it into the goat mammary epithelial cell line. The recombinant plasmid inserted with CecropinB was transfected into the goat mammary epithelial cell by liposome Tfx^M-20. By screening with G418, the stable transfected goat mammary epithelial cell line was established and the transcription and expression of CecropinB were identified by RT-PCR and agarose diffusion experiment, respectively. Results showed that eukaryotic expression vector pECFP-B was constructed successfully. Stable transfected goat mammary epithelial cell line was established and the CecropinB protein was expressed successfully. It provides the solid foundation for further experimental studies on the function of CecropinB.
文摘The question of stable control system of bank-to-turn (BTT) missiles is a bottleneckin BTT technology. Integrate fuzzy logic stable control system of BTT missiles is designed in whichthree main problems are resolved. How to select input variables Of the fuzzy logic controller and howto guarantee completeness of the output control are two of them. The last one is how to coordinatethe fuzzy logic controllers in integrate fuzzy logic stable control system. Simulating results prov that integrate fuzzy logic stable coatrol system of BTT missiles is sueccessful, and it can be widelyused in future.
