Monthly forecast of export and import of China is investigated in this paper. Export, import, exchange rates and foreign reserve of China are coincided with in a vector error corrected model, on which seasonal export ...Monthly forecast of export and import of China is investigated in this paper. Export, import, exchange rates and foreign reserve of China are coincided with in a vector error corrected model, on which seasonal export and import can be forecasted in a reasonable precision. With impulse response analysis, impact of exchange rate to export is discussed.展开更多
Correlation between the absolute configuration and the CD spectra of organic peroxides was studied by ab initio method with a mo- d el moleeule CH_3-O-O-CH_3.For P form when 0°≤θ(twist angle of C-O-O-C) <90&...Correlation between the absolute configuration and the CD spectra of organic peroxides was studied by ab initio method with a mo- d el moleeule CH_3-O-O-CH_3.For P form when 0°≤θ(twist angle of C-O-O-C) <90°, there is positive Cotton effect;when 90°<θ≤180°, there is nega- tive Cotton effect;the curve is bisignate at θ=90°.展开更多
CRISPR-Cas-based genome editing holds immense promise for advancing plant genomics and crop enhancement.However,the challenge of low editing activity complicates the identification of editing events.In this study,we i...CRISPR-Cas-based genome editing holds immense promise for advancing plant genomics and crop enhancement.However,the challenge of low editing activity complicates the identification of editing events.In this study,we introduce multiple single transcript unit surrogate reporter(STU-SR)systems to enhance the selection of genome-edited plants.These systems use the same single guide RNAs designed for endogenous genes to edit reporter genes,establishing a direct link between reporter gene editing activity and that of endogenous genes.Various strategies are used to restore functional reporter genes after genome editing,including efficient single-strand annealing(SSA)for homologous recombination in STUSR-SSA systems.STU-SR-base editor systems leverage base editing to reinstate the start codon,enriching C-to-T and A-to-G base editing events.Our results showcase the effectiveness of these STU-SR systems in enhancing genome editing events in the monocot rice,encompassing Cas9 nuclease-based targeted mutagenesis,cytosine base editing,and adenine base editing.The systems exhibit compatibility with Cas9 variants,such as the PAM-less SpRY,and are shown to boost genome editing in Brassica oleracea,a dicot vegetable crop.In summary,we have developed highly efficient and versatile STU-SR systems for enrichment of genome-edited plants.展开更多
A systematic research on the pyrolysis process of polymethysilicone (SAR-2) and the thermostability of the pyrolysis residue was made by the thermogravimetric analysis, DTA and infrared spectroscopy.The experimental r...A systematic research on the pyrolysis process of polymethysilicone (SAR-2) and the thermostability of the pyrolysis residue was made by the thermogravimetric analysis, DTA and infrared spectroscopy.The experimental results indicate that the pyrolysis residue of SAR-2 converted into the amorphous SiC_xO_(4-x) phase above 900 ℃,the residue at 1200 ℃ is the most thermostable and antioxidant.It is suitable to be used as polysilicone preceramic.展开更多
Saddlepoint approximations for the studentized compound Poisson sums with no moment conditions in audit sampling are derived. This result not only provides a very accurate approximation for studentized compound Poisso...Saddlepoint approximations for the studentized compound Poisson sums with no moment conditions in audit sampling are derived. This result not only provides a very accurate approximation for studentized compound Poisson sums, but also can be applied much more widely in statistical inference of the error amount in an audit population of accounts to check the validity of financial statements of a firm. Some numerical illustrations and comparison with the normal approximation method are presented.展开更多
Passive voice is a common linguistic phenomenon both in Chinese and in English, while it is used differently in each language system. This paper takes the grammar features of passive voice in both Chinese and English ...Passive voice is a common linguistic phenomenon both in Chinese and in English, while it is used differently in each language system. This paper takes the grammar features of passive voice in both Chinese and English as an example, collecting corpus data of passive voice in the two languages, to comparatively analyze the cultural difference reflected from the usage of languages. Getting to know this kind of cultural difference would help us to better understand linguistic phenomena in second language acquisition, and to master them better.展开更多
基金Projectsupported by National 863Program ( No.863-30 6-ZT0 4 -0 4 -1 )
文摘Monthly forecast of export and import of China is investigated in this paper. Export, import, exchange rates and foreign reserve of China are coincided with in a vector error corrected model, on which seasonal export and import can be forecasted in a reasonable precision. With impulse response analysis, impact of exchange rate to export is discussed.
文摘Correlation between the absolute configuration and the CD spectra of organic peroxides was studied by ab initio method with a mo- d el moleeule CH_3-O-O-CH_3.For P form when 0°≤θ(twist angle of C-O-O-C) <90°, there is positive Cotton effect;when 90°<θ≤180°, there is nega- tive Cotton effect;the curve is bisignate at θ=90°.
基金supported by the National Key Research and Development Program of China(award no.2023YFD1202900)the National Science Foundation of China(award nos.32270433 and 32101205)+4 种基金the Natural Science Foundation of Sichuan Province(award no.2022NSFSC0143)to Y.Z.and X.T.,the Joint Science and Technology Project between Sichuan Province and Chongqing Municipality(award no.CSTC2021JSCXCYLHX0001)to H.S.and X.T.the Modern Seed Industry Project of Chongqing Municipal Science and Technology Bureau(award no.CSTB2023TIAD-KPX0025)to H.S.the National Science Foundation of China(award no.32301248)to Q.R.the National Science Foundation of China(award no.32072045)to X.Z.supported by the NSF Plant Genome Research Program(award nos.IOS-2029889 and IOS-2132693)to Y.Q.
文摘CRISPR-Cas-based genome editing holds immense promise for advancing plant genomics and crop enhancement.However,the challenge of low editing activity complicates the identification of editing events.In this study,we introduce multiple single transcript unit surrogate reporter(STU-SR)systems to enhance the selection of genome-edited plants.These systems use the same single guide RNAs designed for endogenous genes to edit reporter genes,establishing a direct link between reporter gene editing activity and that of endogenous genes.Various strategies are used to restore functional reporter genes after genome editing,including efficient single-strand annealing(SSA)for homologous recombination in STUSR-SSA systems.STU-SR-base editor systems leverage base editing to reinstate the start codon,enriching C-to-T and A-to-G base editing events.Our results showcase the effectiveness of these STU-SR systems in enhancing genome editing events in the monocot rice,encompassing Cas9 nuclease-based targeted mutagenesis,cytosine base editing,and adenine base editing.The systems exhibit compatibility with Cas9 variants,such as the PAM-less SpRY,and are shown to boost genome editing in Brassica oleracea,a dicot vegetable crop.In summary,we have developed highly efficient and versatile STU-SR systems for enrichment of genome-edited plants.
文摘A systematic research on the pyrolysis process of polymethysilicone (SAR-2) and the thermostability of the pyrolysis residue was made by the thermogravimetric analysis, DTA and infrared spectroscopy.The experimental results indicate that the pyrolysis residue of SAR-2 converted into the amorphous SiC_xO_(4-x) phase above 900 ℃,the residue at 1200 ℃ is the most thermostable and antioxidant.It is suitable to be used as polysilicone preceramic.
基金National Natural Science Foundation of China(Grant Nos. 71032005, 70802035)the MOE Project of Key Research Institute of Humanities and Social Science in University (Grant No. 07JJD63007)supported in part by National University of Singapore (Grant No. R-155-050-095-112)
文摘Saddlepoint approximations for the studentized compound Poisson sums with no moment conditions in audit sampling are derived. This result not only provides a very accurate approximation for studentized compound Poisson sums, but also can be applied much more widely in statistical inference of the error amount in an audit population of accounts to check the validity of financial statements of a firm. Some numerical illustrations and comparison with the normal approximation method are presented.
文摘Passive voice is a common linguistic phenomenon both in Chinese and in English, while it is used differently in each language system. This paper takes the grammar features of passive voice in both Chinese and English as an example, collecting corpus data of passive voice in the two languages, to comparatively analyze the cultural difference reflected from the usage of languages. Getting to know this kind of cultural difference would help us to better understand linguistic phenomena in second language acquisition, and to master them better.