Apodemus （mice） and Rattus （rats） are the top rodent reservoirs for zoonoses in China,yet little is known about their diversity.We reexamined the alpha diversity of these two genera based on a new collection of sp...Apodemus （mice） and Rattus （rats） are the top rodent reservoirs for zoonoses in China,yet little is known about their diversity.We reexamined the alpha diversity of these two genera based on a new collection of specimens from China and their cyt b sequences in GenBank.We also tested whether species could be identified using external and craniodental measurements exclusively.Measurements from 147 specimens of Apodemus and 233 specimens of Rattus were used for morphological comparisons.We analysed 74 cyt b sequences of Apodemus and 100 cyt b sequences of Rattus to facilitate phylogenetic estimations.Results demonstrated that nine species of Apodemus and seven species of Rattus,plus a new subspecies of Rattus nitidus,are distributed in China.Principal component analysis using external and craniodental measurements revealed that measurements alone could not separate the recognized species.The occurrence of Rattus pyctoris in China remains uncertain.展开更多
Flake graphite iron, compacted graphite iron and spheroidal graphite iron with various tensile strengths were cast. They were selected and grouped according to roughly the same tensile strength, and then the main cutt...Flake graphite iron, compacted graphite iron and spheroidal graphite iron with various tensile strengths were cast. They were selected and grouped according to roughly the same tensile strength, and then the main cutting force in each group was measured and compared. The microstructures of different cast irons were characterized. The relationship between the cutting force and microstructure was established. Results show that the graphite morphology in cast irons determines the strength. In order to obtain the same strength of the cast iron with sharply edged graphite, more or finer pearlite in the matrix is needed. Graphitic cast irons with high pearlite content and smaller pearlite interlamellar spacing have higher hardness. For the cast irons with different graphite morphologies, but almost the same tensile strength, the main cutting force is obviously different, along with the hardness. Harder cast irons have a greater cutting force, but the difference in cutting force is not proportional to hardness.展开更多
Pikas(Lagomorpha:Ochotonidae)are small mouselike lagomorphs.To investigate their adaptation to different ecological environments during their dispersal from the Qinghai-Xizang(Tibet)Plateau(QTP),we collected 226 pikas...Pikas(Lagomorpha:Ochotonidae)are small mouselike lagomorphs.To investigate their adaptation to different ecological environments during their dispersal from the Qinghai-Xizang(Tibet)Plateau(QTP),we collected 226 pikas and measured 20 morphological characteristics and recorded habitat information.We also sequenced the genome of 81specimens,representing 27 putative pika species.The genome-wide tree based on 4?090 coding genes identified five subgenera,i.e.,Alienauroa,Conothoa,Lagotona,Ochotona,and Pika,consistent with morphometric data.Morphologically,Alienauroa and Ochotona had similar traits,including smaller size and earlier divergence time compared to other pikas.Consistently,the habitats of Alienauroa and Ochotona differed from those of the remaining subgenera.Phylogenetic signal analysis detected 83 genes significantly related to morphological characteristics,including several visual and hearingrelated genes.Analysis of shared amino acid substitutions and positively selected genes(PSGs)in Alienauroa and Ochotona identified two genes,i.e.,mitochondrial function-related TSFM(p.Q155E)and low-light visual sensitivity-related PROM1(p.H419Y).Functional experiments demonstrated that TSFM-155E significantly enhanced mitochondrial function compared to TSFM-155Q in other pikas,and PROM1-419Y decreased the modeling of dynamic intracellular chloride efflux upon calcium uptake.Alienauroa and Ochotona individuals mostly inhabit different environments(e.g.,subtropical forests)than other pikas,suggesting that a shift from the larger ancestral type and changes in sensory acuity and energy enhancement may have been required in their new environments.This study increases our understanding of the evolutionary history of pikas.展开更多
At present what are the key points focused in the research of loop-delay estimation for the digital predistorter in the radio frequency （RF） power amplifier system is reducing its complexity of engineering realizati...At present what are the key points focused in the research of loop-delay estimation for the digital predistorter in the radio frequency （RF） power amplifier system is reducing its complexity of engineering realization and improving anti-jamming ability and computational speed. Besides, opening up its application scope should be contained. For these targets, a novel method including integer loop delay estimation and fractional part is proposed. The integer part applies amplitude-difference summation function and the fractional one adopts the method of finite impulse response （FIR） linear interpolation. The algorithm finds wide applications. What is more, strong anti-jamming ability and low complexity are also its merits. Simulation results support the above opinion. Digital predistortion （DPD） system based on this algorithm achieves good performance.展开更多
Insomnia is one of the most common clinical health problems,which can lead to a variety of complications and seriously affect human physical and mental health.Acupuncture has been used for treating insomnia for thousa...Insomnia is one of the most common clinical health problems,which can lead to a variety of complications and seriously affect human physical and mental health.Acupuncture has been used for treating insomnia for thousands of years,and is currently widely used as an alternative thehere is still a lack of up-to-date and comprehensive understanding of the mechanism of acupuncture for insorapy for insomnia all over the world.However,the mechanism of acupuncture for insomnia is still unclear,the mechanism research is relatively discrete,and tmnia.After summary and analysis in this study,it is found that acupuncture may improve sleeping by adjusting central neurotransmitter,insomnia-related hormone,circadian rhythm,sleep structure,and brain function.How to scientifically explain the scientific mechanism of acupuncture in treating insomnia has great challenges.I hope this study can provide reference for future research on the mechanism of acupuncture for insomnia.展开更多
Polarizers have always been an important optical component for optical engineering and have played an indispensable part of polarization imaging systems.Metasurface polarizers provide an excellent platform to achieve ...Polarizers have always been an important optical component for optical engineering and have played an indispensable part of polarization imaging systems.Metasurface polarizers provide an excellent platform to achieve miniaturization,high resolution,and low cost of polarization imaging systems.Here,we proposed freeform metasurface polarizers derived by adjoint-based inverse design of a full-Jones matrix with gradient-descent optimization.We designed multiple freeform polarizers with different filtered states of polarization(SOPs),including circular polarizers,elliptical polarizers,and linear polarizers that could cover the full Poincarésphere.Note that near-unitary polarization dichroism and the ultrahigh polarization extinction ratio(ER)reaching 50 d B were achieved for optimized circular polarizers.The multiple freeform polarizers with filtered polarization state locating at four vertices of an inscribed regular tetrahedron of the Poincarésphere are designed to form a full-Stokes parameters micropolarizer array.Our work provides a novel approach,we believe,for the design of meta-polarizers that may have potential applications in polarization imaging,polarization detection,and communication.展开更多
基金funded by the National Natural Science Foundation of China(3147011031301869+3 种基金31670388)Key Research Program of the Chinese Academy of Sciences(KJZD-EW-L07)Yunnan Applied Basic Research Projects(2014FB176)China Postdoctoral Science Foundation(2015M570801)
文摘Apodemus （mice） and Rattus （rats） are the top rodent reservoirs for zoonoses in China,yet little is known about their diversity.We reexamined the alpha diversity of these two genera based on a new collection of specimens from China and their cyt b sequences in GenBank.We also tested whether species could be identified using external and craniodental measurements exclusively.Measurements from 147 specimens of Apodemus and 233 specimens of Rattus were used for morphological comparisons.We analysed 74 cyt b sequences of Apodemus and 100 cyt b sequences of Rattus to facilitate phylogenetic estimations.Results demonstrated that nine species of Apodemus and seven species of Rattus,plus a new subspecies of Rattus nitidus,are distributed in China.Principal component analysis using external and craniodental measurements revealed that measurements alone could not separate the recognized species.The occurrence of Rattus pyctoris in China remains uncertain.
基金supported by the China’s National Overseas Study Fund(CSC201808180001)the National Natural Science Foundation of China(U1804146)the Program for Science and Technology Innovation Talents in Universities of the Henan Province(17HASTIT026)
文摘Flake graphite iron, compacted graphite iron and spheroidal graphite iron with various tensile strengths were cast. They were selected and grouped according to roughly the same tensile strength, and then the main cutting force in each group was measured and compared. The microstructures of different cast irons were characterized. The relationship between the cutting force and microstructure was established. Results show that the graphite morphology in cast irons determines the strength. In order to obtain the same strength of the cast iron with sharply edged graphite, more or finer pearlite in the matrix is needed. Graphitic cast irons with high pearlite content and smaller pearlite interlamellar spacing have higher hardness. For the cast irons with different graphite morphologies, but almost the same tensile strength, the main cutting force is obviously different, along with the hardness. Harder cast irons have a greater cutting force, but the difference in cutting force is not proportional to hardness.
基金supported by the National Natural Science Foundation of China(31470110,31970399)China National GeneBank(CNGB)。
文摘Pikas(Lagomorpha:Ochotonidae)are small mouselike lagomorphs.To investigate their adaptation to different ecological environments during their dispersal from the Qinghai-Xizang(Tibet)Plateau(QTP),we collected 226 pikas and measured 20 morphological characteristics and recorded habitat information.We also sequenced the genome of 81specimens,representing 27 putative pika species.The genome-wide tree based on 4?090 coding genes identified five subgenera,i.e.,Alienauroa,Conothoa,Lagotona,Ochotona,and Pika,consistent with morphometric data.Morphologically,Alienauroa and Ochotona had similar traits,including smaller size and earlier divergence time compared to other pikas.Consistently,the habitats of Alienauroa and Ochotona differed from those of the remaining subgenera.Phylogenetic signal analysis detected 83 genes significantly related to morphological characteristics,including several visual and hearingrelated genes.Analysis of shared amino acid substitutions and positively selected genes(PSGs)in Alienauroa and Ochotona identified two genes,i.e.,mitochondrial function-related TSFM(p.Q155E)and low-light visual sensitivity-related PROM1(p.H419Y).Functional experiments demonstrated that TSFM-155E significantly enhanced mitochondrial function compared to TSFM-155Q in other pikas,and PROM1-419Y decreased the modeling of dynamic intracellular chloride efflux upon calcium uptake.Alienauroa and Ochotona individuals mostly inhabit different environments(e.g.,subtropical forests)than other pikas,suggesting that a shift from the larger ancestral type and changes in sensory acuity and energy enhancement may have been required in their new environments.This study increases our understanding of the evolutionary history of pikas.
基金supported by the Circuit and System Foremost Discipline of Zhejiang Province under Grant No. ZZ050103-11
文摘At present what are the key points focused in the research of loop-delay estimation for the digital predistorter in the radio frequency （RF） power amplifier system is reducing its complexity of engineering realization and improving anti-jamming ability and computational speed. Besides, opening up its application scope should be contained. For these targets, a novel method including integer loop delay estimation and fractional part is proposed. The integer part applies amplitude-difference summation function and the fractional one adopts the method of finite impulse response （FIR） linear interpolation. The algorithm finds wide applications. What is more, strong anti-jamming ability and low complexity are also its merits. Simulation results support the above opinion. Digital predistortion （DPD） system based on this algorithm achieves good performance.
基金National Administration of Traditional Chinese Medicine(No.ZZ-06)。
文摘Insomnia is one of the most common clinical health problems,which can lead to a variety of complications and seriously affect human physical and mental health.Acupuncture has been used for treating insomnia for thousands of years,and is currently widely used as an alternative thehere is still a lack of up-to-date and comprehensive understanding of the mechanism of acupuncture for insorapy for insomnia all over the world.However,the mechanism of acupuncture for insomnia is still unclear,the mechanism research is relatively discrete,and tmnia.After summary and analysis in this study,it is found that acupuncture may improve sleeping by adjusting central neurotransmitter,insomnia-related hormone,circadian rhythm,sleep structure,and brain function.How to scientifically explain the scientific mechanism of acupuncture in treating insomnia has great challenges.I hope this study can provide reference for future research on the mechanism of acupuncture for insomnia.
基金supported by the National Key Research and Development Program of China(Nos.2022YFB3607300 and 2021YFB2802003)the National Natural Science Foundation of China(NSFC)(No.62075084)the Guangdong Basic and Applied Basic Research Foundation(No.2022B1515020004)。
文摘Polarizers have always been an important optical component for optical engineering and have played an indispensable part of polarization imaging systems.Metasurface polarizers provide an excellent platform to achieve miniaturization,high resolution,and low cost of polarization imaging systems.Here,we proposed freeform metasurface polarizers derived by adjoint-based inverse design of a full-Jones matrix with gradient-descent optimization.We designed multiple freeform polarizers with different filtered states of polarization(SOPs),including circular polarizers,elliptical polarizers,and linear polarizers that could cover the full Poincarésphere.Note that near-unitary polarization dichroism and the ultrahigh polarization extinction ratio(ER)reaching 50 d B were achieved for optimized circular polarizers.The multiple freeform polarizers with filtered polarization state locating at four vertices of an inscribed regular tetrahedron of the Poincarésphere are designed to form a full-Stokes parameters micropolarizer array.Our work provides a novel approach,we believe,for the design of meta-polarizers that may have potential applications in polarization imaging,polarization detection,and communication.
