Presents the meshing analysis based on the Computer Algebra System to make it easier to deduce complex formulas while the expression of more complicated surface equations are visualized, by which, the contact line, me...Presents the meshing analysis based on the Computer Algebra System to make it easier to deduce complex formulas while the expression of more complicated surface equations are visualized, by which, the contact line, meshing bordlines and undercut bordlines of toroidal drive are deduced, and the results obtained are consistent with the results discussed in literature [1] , and concludes that the absolute value of the induced normal curvature is usually smaller (less than 0.12, for example), and it increases as parameters φ 2, V and R increase, decreases as parameter r increases, and hardly varies with W 2, and the variation with a, i 21 is not definite.展开更多
This paper investigates the mediation of the adoption of computerized accounting system （CAS） on the relationship between environmental uncertainty and organizational performance. The authors use factor analysis, pa...This paper investigates the mediation of the adoption of computerized accounting system （CAS） on the relationship between environmental uncertainty and organizational performance. The authors use factor analysis, path analysis, and regression model to examine the effects of CAS adoption on the relationship between environmental uncertainty and organizational performance. The findings reveal that the adoption level of CAS is positively associated with organizational characteristics, environmental uncertainty, and organizational performance, and the usage of CAS has a statistically significant mediating effect on the relationship between environmental uncertainty and organizational performance. This paper will be significant to business managers in the decision to adopt CAS.展开更多
Computer Algebra Systems have been extensively used in higher education. The reasons are many e.g., visualize mathematical problems, correlate real-world problems on a conceptual level, are flexible, simple to use, ac...Computer Algebra Systems have been extensively used in higher education. The reasons are many e.g., visualize mathematical problems, correlate real-world problems on a conceptual level, are flexible, simple to use, accessible from anywhere, etc. However, there is still room for improvement. Computer algebra system (CAS) optimization is the set of best practices and techniques to keep the CAS running optimally. Best practices are related to how to carry out a mathematical task or configure your system. In this paper, we are going to examine these techniques. The documentation sheets of CASs are the source of data that we used to compare them and examine their characteristics. The research results reveal that there are many tips that we can follow to accelerate performance.展开更多
Loday introduced di-associative algebras and tri-associative algebras motivated by periodicity phenomena in algebraic K-theory.The purpose of this paper is to study the splittings of operations on di-associative algeb...Loday introduced di-associative algebras and tri-associative algebras motivated by periodicity phenomena in algebraic K-theory.The purpose of this paper is to study the splittings of operations on di-associative algebras and tri-associative algebras.We introduce the notion of a quad-dendriform algebra,which is a splitting of a di-associative algebra.We show that a relative averaging operator on dendriform algebras gives rise to a quad-dendriform algebra.Furthermore,we introduce the notion of six-dendriform algebras,which are splittings of the tri-associative algebras,and demonstrate that homomorphic relative averaging operators induce six-dendriform algebras.展开更多
CRISPR-Cas endonucleases mediate prokaryotic adaptive immunity by targeting foreign nucleic acids.CRISPR/Cas13b is a class 2 type VI-B ribonuclease that targets and cleaves single-stranded RNA.It exhibits higher RNA i...CRISPR-Cas endonucleases mediate prokaryotic adaptive immunity by targeting foreign nucleic acids.CRISPR/Cas13b is a class 2 type VI-B ribonuclease that targets and cleaves single-stranded RNA.It exhibits higher RNA interference activity than Cas13a and Cas13c and causes fewer collateral effects than RxCas13d in mammalian cells.However,a programmable CRISPR/Cas13b-mediated RNA interference system for endogenous transcripts in rice has not yet been established.Here,we developed a CRISPR/Cas13b-mediated system to target endogenous transcripts in rice.Our CRISPR/Cas13b system could inhibit multiple endogenous mRNAs simultaneously.In addition,this system efficiently repressed endogenous long noncoding RNAs with more than 50% inhibition in stable transgenic plants.Furthermore,we found only weak collateral effects of the CRISPR/Cas13b-mediated system at the transcriptome-wide level,and no difference in the agronomic traits of stable transgenic rice in the field.We present a programmable CRISPR/Cas13b-mediated knockdown system for rice,offering a potential biotechnological tool for functional genomics and crop improvement.展开更多
This research paper addresses,from an ecogeographic perspective within a localised context,a new concept of nature conservation within modern farming systems:the direct seeding technique based on the principles of the...This research paper addresses,from an ecogeographic perspective within a localised context,a new concept of nature conservation within modern farming systems:the direct seeding technique based on the principles of the Conservation Agriculture System(CAS).The adoption of CAS aims to increase soil fertility,promote biodiversity,and sustain production,making it one of the most effective adaptation solutions available to address the challenges of climate change.CAS is defined as a farming system based on three key principles:minimal soil disturbance(reduced or zero tillage),maintaining a permanent soil cover(with residues from previous crops),and adopting crop rotation(diversifying crops rather than limiting them to a single type in consecutive seasons).However,there is limited research and a lack of scientific studies on the implementation of conservation agriculture in developing nations such as Morocco,particularly in the Had Kourt region.This study aims to assess the feasibility of CAS compared to traditional agricultural systems by surveying the opinions of farmers who have experience with both systems and comparing the outcomes of their practices based on simple indicators as an initial stage,with further analysis of additional indicators planned through subsequent scientific investigations.The sampling method used in this study is non-discriminatory,as semi-structured interviews were conducted with a group of farmers to gather their opinions on CAS.The adoption of conservation agriculture has been linked to prior knowledge of the system,acquired through training and fieldwork via application platforms,which remain limited in scope.展开更多
Aim To study an algebraic of the dynamical equations of holonomic mechanical systems in relative motion. Methods The equations of motion were presented in a contravariant algebraic form and an algebraic product was...Aim To study an algebraic of the dynamical equations of holonomic mechanical systems in relative motion. Methods The equations of motion were presented in a contravariant algebraic form and an algebraic product was determined. Results and Conclusion The equations a Lie algebraic structure if any nonpotential generalized force doesn't exist while while the equations possess a Lie-admissible algebraic structure if nonpotential generalized forces exist .展开更多
In order to provide the theoretical guidance for applying the neutralization method to treatment of heavy metals wastewater with high concentration of sulfate, and to better understand the mechanism of calcium sulfate...In order to provide the theoretical guidance for applying the neutralization method to treatment of heavy metals wastewater with high concentration of sulfate, and to better understand the mechanism of calcium sulfate scale formation, the equilibrium solubility data of CaSOa-Ca（OH）2-H2O system at 298.15 K were theoretically calculated via the Pitzer semi-empirical ion-interaction theory, and determined experimentally by the optical method combining with X-ray diffractometry, and the calculated and determined phase diagrams of CaSOa-Ca（OH）2-H2O system were plotted and compared. Physical definition of each area was studied, and the physical law of characteristic point and line was explained in detail. Adjusting the pH value of neutralization-hydrolysis solution depended on the SO4z- concentration in the system. And interaction characteristics between the solubilities of CaSO4（s）and Ca（OH）2（s）were found out.展开更多
Transcription activator-like effector nucleases （TALENs） and clustered regularly interspaced short palindromic repeats （CRISPR）/ CRISPR-associated （Cas） systems have emerged as powerful tools for genome editing ...Transcription activator-like effector nucleases （TALENs） and clustered regularly interspaced short palindromic repeats （CRISPR）/ CRISPR-associated （Cas） systems have emerged as powerful tools for genome editing in a variety of species. Here, we report, for the first time, targeted mutagenesis in Zea mays using TALENs and the CRISPR/Cas system. We designed five TALENs targeting 4 genes, namely ZmPDS, ZmlPKIA, ZmlPK, ZmMRP4, and obtained targeting efficiencies of up to 23.1% in protoplasts, and about 13.3% to 39.1% of the transgenic plants were somatic mutations. Also, we constructed two gRNAs targeting the ZmlPK gene in maize protoplasts, at frequencies of 16.4% and 19.1%, respectively. In addition, the CRISPR/Cas system induced targeted mutations in Z. mays protoplasts with efficiencies （13.1%） similar to those obtained with TALENs （9.1%）. Our results show that both TALENs and the CRISPR/Cas system can be used for genome modification in maize.展开更多
We investigate the problem of growth order of solutions of a type of systems of non-linear algebraic differential equations, and extend some results of the growth order of solutions of algebraic differential equations...We investigate the problem of growth order of solutions of a type of systems of non-linear algebraic differential equations, and extend some results of the growth order of solutions of algebraic differential equations to systems of algebraic differential equations.展开更多
文摘Presents the meshing analysis based on the Computer Algebra System to make it easier to deduce complex formulas while the expression of more complicated surface equations are visualized, by which, the contact line, meshing bordlines and undercut bordlines of toroidal drive are deduced, and the results obtained are consistent with the results discussed in literature [1] , and concludes that the absolute value of the induced normal curvature is usually smaller (less than 0.12, for example), and it increases as parameters φ 2, V and R increase, decreases as parameter r increases, and hardly varies with W 2, and the variation with a, i 21 is not definite.
文摘This paper investigates the mediation of the adoption of computerized accounting system （CAS） on the relationship between environmental uncertainty and organizational performance. The authors use factor analysis, path analysis, and regression model to examine the effects of CAS adoption on the relationship between environmental uncertainty and organizational performance. The findings reveal that the adoption level of CAS is positively associated with organizational characteristics, environmental uncertainty, and organizational performance, and the usage of CAS has a statistically significant mediating effect on the relationship between environmental uncertainty and organizational performance. This paper will be significant to business managers in the decision to adopt CAS.
文摘Computer Algebra Systems have been extensively used in higher education. The reasons are many e.g., visualize mathematical problems, correlate real-world problems on a conceptual level, are flexible, simple to use, accessible from anywhere, etc. However, there is still room for improvement. Computer algebra system (CAS) optimization is the set of best practices and techniques to keep the CAS running optimally. Best practices are related to how to carry out a mathematical task or configure your system. In this paper, we are going to examine these techniques. The documentation sheets of CASs are the source of data that we used to compare them and examine their characteristics. The research results reveal that there are many tips that we can follow to accelerate performance.
基金Supported by the Science and Technology Program of Guizhou Province(Grant No.QKHJC QN[2025]362)the National Natural Science Foundation of China(Grant No.12361005).
文摘Loday introduced di-associative algebras and tri-associative algebras motivated by periodicity phenomena in algebraic K-theory.The purpose of this paper is to study the splittings of operations on di-associative algebras and tri-associative algebras.We introduce the notion of a quad-dendriform algebra,which is a splitting of a di-associative algebra.We show that a relative averaging operator on dendriform algebras gives rise to a quad-dendriform algebra.Furthermore,we introduce the notion of six-dendriform algebras,which are splittings of the tri-associative algebras,and demonstrate that homomorphic relative averaging operators induce six-dendriform algebras.
基金supported by the Natural Science Foundation of Zhejiang Province,China(Grant Nos.LZ22C150002 and LR24C150001)the National Key Research and Development Program of China(Grant Nos.2021YFF1000402 and 2022YFD1401600)+1 种基金the National Natural Science Foundation of China(Grant No.32170262)the Fundamental Research Funds for the Central Universities,China(Grant No.K20240124).
文摘CRISPR-Cas endonucleases mediate prokaryotic adaptive immunity by targeting foreign nucleic acids.CRISPR/Cas13b is a class 2 type VI-B ribonuclease that targets and cleaves single-stranded RNA.It exhibits higher RNA interference activity than Cas13a and Cas13c and causes fewer collateral effects than RxCas13d in mammalian cells.However,a programmable CRISPR/Cas13b-mediated RNA interference system for endogenous transcripts in rice has not yet been established.Here,we developed a CRISPR/Cas13b-mediated system to target endogenous transcripts in rice.Our CRISPR/Cas13b system could inhibit multiple endogenous mRNAs simultaneously.In addition,this system efficiently repressed endogenous long noncoding RNAs with more than 50% inhibition in stable transgenic plants.Furthermore,we found only weak collateral effects of the CRISPR/Cas13b-mediated system at the transcriptome-wide level,and no difference in the agronomic traits of stable transgenic rice in the field.We present a programmable CRISPR/Cas13b-mediated knockdown system for rice,offering a potential biotechnological tool for functional genomics and crop improvement.
文摘This research paper addresses,from an ecogeographic perspective within a localised context,a new concept of nature conservation within modern farming systems:the direct seeding technique based on the principles of the Conservation Agriculture System(CAS).The adoption of CAS aims to increase soil fertility,promote biodiversity,and sustain production,making it one of the most effective adaptation solutions available to address the challenges of climate change.CAS is defined as a farming system based on three key principles:minimal soil disturbance(reduced or zero tillage),maintaining a permanent soil cover(with residues from previous crops),and adopting crop rotation(diversifying crops rather than limiting them to a single type in consecutive seasons).However,there is limited research and a lack of scientific studies on the implementation of conservation agriculture in developing nations such as Morocco,particularly in the Had Kourt region.This study aims to assess the feasibility of CAS compared to traditional agricultural systems by surveying the opinions of farmers who have experience with both systems and comparing the outcomes of their practices based on simple indicators as an initial stage,with further analysis of additional indicators planned through subsequent scientific investigations.The sampling method used in this study is non-discriminatory,as semi-structured interviews were conducted with a group of farmers to gather their opinions on CAS.The adoption of conservation agriculture has been linked to prior knowledge of the system,acquired through training and fieldwork via application platforms,which remain limited in scope.
文摘Aim To study an algebraic of the dynamical equations of holonomic mechanical systems in relative motion. Methods The equations of motion were presented in a contravariant algebraic form and an algebraic product was determined. Results and Conclusion The equations a Lie algebraic structure if any nonpotential generalized force doesn't exist while while the equations possess a Lie-admissible algebraic structure if nonpotential generalized forces exist .
基金Project (50925417) supported by the Funds for Distinguished Young Scientists of ChinaProject (50830301) supported by the National Natural Science Foundation of ChinaProject (2009ZX07212-001-01) supported by Major Science and Technology Program for Water Pollution Control and Treatment
文摘In order to provide the theoretical guidance for applying the neutralization method to treatment of heavy metals wastewater with high concentration of sulfate, and to better understand the mechanism of calcium sulfate scale formation, the equilibrium solubility data of CaSOa-Ca（OH）2-H2O system at 298.15 K were theoretically calculated via the Pitzer semi-empirical ion-interaction theory, and determined experimentally by the optical method combining with X-ray diffractometry, and the calculated and determined phase diagrams of CaSOa-Ca（OH）2-H2O system were plotted and compared. Physical definition of each area was studied, and the physical law of characteristic point and line was explained in detail. Adjusting the pH value of neutralization-hydrolysis solution depended on the SO4z- concentration in the system. And interaction characteristics between the solubilities of CaSO4（s）and Ca（OH）2（s）were found out.
基金supported by the National Natural Science Foundation of China (Grant Nos. 31271795 and 31200273)
文摘Transcription activator-like effector nucleases （TALENs） and clustered regularly interspaced short palindromic repeats （CRISPR）/ CRISPR-associated （Cas） systems have emerged as powerful tools for genome editing in a variety of species. Here, we report, for the first time, targeted mutagenesis in Zea mays using TALENs and the CRISPR/Cas system. We designed five TALENs targeting 4 genes, namely ZmPDS, ZmlPKIA, ZmlPK, ZmMRP4, and obtained targeting efficiencies of up to 23.1% in protoplasts, and about 13.3% to 39.1% of the transgenic plants were somatic mutations. Also, we constructed two gRNAs targeting the ZmlPK gene in maize protoplasts, at frequencies of 16.4% and 19.1%, respectively. In addition, the CRISPR/Cas system induced targeted mutations in Z. mays protoplasts with efficiencies （13.1%） similar to those obtained with TALENs （9.1%）. Our results show that both TALENs and the CRISPR/Cas system can be used for genome modification in maize.
基金supported by the Natural Science Foundationof China (10471065)the Natural Science Foundation of Guangdong Province (N04010474)
文摘We investigate the problem of growth order of solutions of a type of systems of non-linear algebraic differential equations, and extend some results of the growth order of solutions of algebraic differential equations to systems of algebraic differential equations.
