Covert communication technology makes wireless communication more secure,but it also provides more opportunities for illegal users to transmit harmful information.In order to detect the illegal covert communication of...Covert communication technology makes wireless communication more secure,but it also provides more opportunities for illegal users to transmit harmful information.In order to detect the illegal covert communication of the lawbreakers in real time for subsequent processing,this paper proposes a Gamma approximation-based detection method for multi-antenna covert communication systems.Specifically,the Gamma approximation property is used to calculate the miss detection rate and false alarm rate of the monitor firstly.Then the optimization problem to minimize the sum of the missed detection rate and the false alarm rate is proposed.The optimal detection threshold and the minimum error detection probability are solved according to the properties of the Lambert W function.Finally,simulation results are given to demonstrate the effectiveness of the proposed method.展开更多
In order to better promote extension and application of fertigation technology,this paper elaborates major technical issues. It presents pipeline diameter control and increasing the uniformity in selection of methods ...In order to better promote extension and application of fertigation technology,this paper elaborates major technical issues. It presents pipeline diameter control and increasing the uniformity in selection of methods of irrigation system types and in the process of system design. Besides,it introduces characteristics and use methods of main fertilizer application equipment,filter,and control devices. In addition,it lists amount of fertilizer application and irrigation according to target yield of crops,and describes major attentions for selection of fertilizers,irrigation,and soil moisture control.展开更多
The manganese-catalyzed dehydrogenative coupling between methanol and amines for the synthesis of ureas and polyureas is described. Importantly, catalytic efficiency can be improved by the newly synthesized MACHO liga...The manganese-catalyzed dehydrogenative coupling between methanol and amines for the synthesis of ureas and polyureas is described. Importantly, catalytic efficiency can be improved by the newly synthesized MACHO ligands. Furthermore, this highly atom-economical protocol demonstrates a broad substrate scope with good functional group tolerance, producing H_(2)as the sole byproduct. Mechanistic studies disclose that formamide is formed through manganese-catalyzed formylation of amine with methanol.Subsequent dehydrogenation affords a transient isocyanate, which is attacked by another equivalent of amine to provide the final product.展开更多
Dear Editor,Neurodevelopmental disorders include a wide range of conditions such as epilepsy,intellectual disability,and autism spectrum disorder.These disorders commonly cooccur in patients,which suggests that they s...Dear Editor,Neurodevelopmental disorders include a wide range of conditions such as epilepsy,intellectual disability,and autism spectrum disorder.These disorders commonly cooccur in patients,which suggests that they share a common etiology[1,2].Genetic advances resulting from sequencing techniques over the past few years have greatly expanded our understanding of neurodevelopmental disorders.展开更多
A series of nickel-doped copper tungstate/oxygen-rich TiO_(2) heterojunction-constructed composites of xNi-CuWO_(4)/OTiO_(2) were successfully prepared to demonstrate the enhancement of the visible-light photoactivity...A series of nickel-doped copper tungstate/oxygen-rich TiO_(2) heterojunction-constructed composites of xNi-CuWO_(4)/OTiO_(2) were successfully prepared to demonstrate the enhancement of the visible-light photoactivity through promoting the photogenerated charge carrier separation efficiency.Of all these composites,0.2Ni-CuWO_(4)/OTiO_(2) exhibits excellent and stable visible light photoactivity for the photooxidative coupling of benzylamine to the corresponding N-benzyl-1-phenymethanimine(BPMI)in air atmosphere.The conversion of benzylamine and the selectivity to BPMI reach 97%and 99%,respectively.The catalyst shows good cyclability with the conversion of benzylamine decreasing just by 22%after being repeated six times with the well-maintained selectivity of BPMI.The composite also exhibits excellent photo-bactericidal ability,which greatly inhibits the reproducing of both the Gram-positive bacteria(e.g.,S.epidermidis)and Gram-negative bacteria(e.g.,E.coli).展开更多
Dear Editor,Hamanaka et al.first reported semaphorin 6B(SEMA6B)(MIM 608873)as a causative gene for progressive myoclonic epilepsy(PME)in 2020[1].They reported that four variants occurred in the last exon of SEMA6B in ...Dear Editor,Hamanaka et al.first reported semaphorin 6B(SEMA6B)(MIM 608873)as a causative gene for progressive myoclonic epilepsy(PME)in 2020[1].They reported that four variants occurred in the last exon of SEMA6B in five unrelated individuals with PME.The clinical presentations of these patients harboring truncated SEMA6B de novo variants(DNVs)were characterized by progressive neurological decline(age of onset:about 2 years old)and myoclonic epilepsy(age of onset:1 year 5 months to 6 years old).展开更多
基金supported by the National Natural Science Foundation of China(NSFC)(Grant No.62101441)Young Talent fund of University Association for Science and Technology in Shaanxi,China(Grant No.20210111)+4 种基金National Key Research and Development Program of China(Grant No.2021YFC2203503)the Fundamental Research Funds for the Central Universities(Grant No.QTZX23065)the Key Research and Development Program of Shaanxi in Industrial Domain(Grant No.2021GY-103)the National Key Laboratory Foundation 2022-JCJQ-LB-006(Grant No.6142411222203)the graduate innovation fund of Xi’an University of Posts and Electrical University(Grand No.CXJJZL2023002)。
文摘Covert communication technology makes wireless communication more secure,but it also provides more opportunities for illegal users to transmit harmful information.In order to detect the illegal covert communication of the lawbreakers in real time for subsequent processing,this paper proposes a Gamma approximation-based detection method for multi-antenna covert communication systems.Specifically,the Gamma approximation property is used to calculate the miss detection rate and false alarm rate of the monitor firstly.Then the optimization problem to minimize the sum of the missed detection rate and the false alarm rate is proposed.The optimal detection threshold and the minimum error detection probability are solved according to the properties of the Lambert W function.Finally,simulation results are given to demonstrate the effectiveness of the proposed method.
基金Supported by Key Foundation Project of Zhejiang Province(2012c16002)Local SciTech Cooperation Project of Zhejiang Academy of Agricultural Sciences(LS20140007)
文摘In order to better promote extension and application of fertigation technology,this paper elaborates major technical issues. It presents pipeline diameter control and increasing the uniformity in selection of methods of irrigation system types and in the process of system design. Besides,it introduces characteristics and use methods of main fertilizer application equipment,filter,and control devices. In addition,it lists amount of fertilizer application and irrigation according to target yield of crops,and describes major attentions for selection of fertilizers,irrigation,and soil moisture control.
基金the financial support from the Fundamental Research Funds for the Central Universities (No.2232022A-09)the National Natural Science Foundation of China(No. 22001033)Natural Science Foundation of Shanghai (No.20ZR1401100)。
文摘The manganese-catalyzed dehydrogenative coupling between methanol and amines for the synthesis of ureas and polyureas is described. Importantly, catalytic efficiency can be improved by the newly synthesized MACHO ligands. Furthermore, this highly atom-economical protocol demonstrates a broad substrate scope with good functional group tolerance, producing H_(2)as the sole byproduct. Mechanistic studies disclose that formamide is formed through manganese-catalyzed formylation of amine with methanol.Subsequent dehydrogenation affords a transient isocyanate, which is attacked by another equivalent of amine to provide the final product.
基金supported by the Science and Technology Department of Hunan Province,China(2017JJ3142).
文摘Dear Editor,Neurodevelopmental disorders include a wide range of conditions such as epilepsy,intellectual disability,and autism spectrum disorder.These disorders commonly cooccur in patients,which suggests that they share a common etiology[1,2].Genetic advances resulting from sequencing techniques over the past few years have greatly expanded our understanding of neurodevelopmental disorders.
基金financially supported by NSFC(52063026,21563026)the Program for Changjiang Scholars and Innovative Research Team in University(IRT15R56)+2 种基金the Innovation Team Basic Scientific Research Project of Gansu Province(1606RJIA324)the Science,Technology Program of GansuProvince(19JR2RA020)Education Department of Gansu Province:Excellent Graduate Student"lnnovation Star"Project(2021CXZX001).
文摘A series of nickel-doped copper tungstate/oxygen-rich TiO_(2) heterojunction-constructed composites of xNi-CuWO_(4)/OTiO_(2) were successfully prepared to demonstrate the enhancement of the visible-light photoactivity through promoting the photogenerated charge carrier separation efficiency.Of all these composites,0.2Ni-CuWO_(4)/OTiO_(2) exhibits excellent and stable visible light photoactivity for the photooxidative coupling of benzylamine to the corresponding N-benzyl-1-phenymethanimine(BPMI)in air atmosphere.The conversion of benzylamine and the selectivity to BPMI reach 97%and 99%,respectively.The catalyst shows good cyclability with the conversion of benzylamine decreasing just by 22%after being repeated six times with the well-maintained selectivity of BPMI.The composite also exhibits excellent photo-bactericidal ability,which greatly inhibits the reproducing of both the Gram-positive bacteria(e.g.,S.epidermidis)and Gram-negative bacteria(e.g.,E.coli).
基金This work was supported by the National Natural Science Foundation of China(81801136)Major Scientific and Technological Projects for Collaborative Prevention and Control of Birth Defects in Hunan Province(2019SK1010,2019SK1012,and 2019SK1014)+2 种基金the National Key R&D Program of China(2019YFC1005100)the Chinese Postdoctoral Science Foundation(2019M662804)the Natural Science Foundation of Hunan Province(2020JJ4854).
文摘Dear Editor,Hamanaka et al.first reported semaphorin 6B(SEMA6B)(MIM 608873)as a causative gene for progressive myoclonic epilepsy(PME)in 2020[1].They reported that four variants occurred in the last exon of SEMA6B in five unrelated individuals with PME.The clinical presentations of these patients harboring truncated SEMA6B de novo variants(DNVs)were characterized by progressive neurological decline(age of onset:about 2 years old)and myoclonic epilepsy(age of onset:1 year 5 months to 6 years old).
