Combining the first-principles calculations and structural enumeration with recognition,the delithiation process of LiNiO_(2)is investigated,where various supercell shapes are considered in order to obtain the formati...Combining the first-principles calculations and structural enumeration with recognition,the delithiation process of LiNiO_(2)is investigated,where various supercell shapes are considered in order to obtain the formation energy of Li_(x)NiO_(2).Meanwhile,the voltage profile is simulated and the ordered phases of lithium vacancies corresponding to concentrations of 1/4,2/5,3/7,1/2,2/3,3/4,5/6,and 6/7 are predicted.To understand the capacity decay in the experiment during the charge/discharge cycles,deoxygenation and Li/Ni antisite defects are calculated,revealing that the chains of oxygen vacancies will be energetically preferrable.It can be inferred that in the absence of oxygen atom in high delithiate state,the diffusion of Ni atoms is facilitated and the formation of Li/Ni antisite is induced.展开更多
Complex-shaped optical lenses are of great interest in the areas of laser processing,machine vision,and optical communications.Traditionally,the processing of complex optical lenses is usually achieved by precision ma...Complex-shaped optical lenses are of great interest in the areas of laser processing,machine vision,and optical communications.Traditionally,the processing of complex optical lenses is usually achieved by precision machining combined with post-grinding or polishing,which is expensive,labor-intensive and difficult in the processing of ultra-complex optical lenses.Additive manufacturing is an emerging technology that provides significant advantages in producing highly intricate optical devices.However,the layer-by-layer method employed in such manufacturing processes has resulted in low printing speeds,as well as limitations in surface quality.To address these challenges,we apply tomographic volumetric printing(TVP)in this work,which can realize the integrated printing of complex structural models without layering.By coordinating the TVP and the meniscus equilibrium post-curing methods,ultra-fast fabrication of complex-shaped lenses with sub-nanometric roughness has been achieved.A2.5 mm high,outer diameter 9 mm spherical lens with a roughness value of RMS=0.3340 nm is printed at a speed of 3.1×10^(4)mm^(3)h^(-1).As a further demonstration,a complex-shaped fly-eye lens is fabricated without any part assembly.The designed spherical lens is mounted on a smartphone’s camera,and the precise alignments above the circuit board are captured.Upon further optimization,this new technology demonstrates the potential for rapid fabrication of ultra-smooth complex optical devices or systems.展开更多
Corallorhiza sinensis,a new species of mycoheterotrophic orchid from western Sichuan,China,is described and illustrated based on molecular and morphological evidence.It is morphologically similar to Corallorhiza trifi...Corallorhiza sinensis,a new species of mycoheterotrophic orchid from western Sichuan,China,is described and illustrated based on molecular and morphological evidence.It is morphologically similar to Corallorhiza trifida,but can be distinguished by bigger flowers,both sepals and petals with 3 veins,and longer lateral lobes of lip.To distinguish the new Corallorhiza species and explore its phylogenetic position within subtribe Calypsoinae,this study employed sequences of the nuclear ribosomal DNA(nrDNA)and whole plastome assembled from the genome skimming approach.The plastome is 148,124 bp in length,including a pair of inverted repeats(IRs)of 26,165 bp,a large single-copy region(LSC)of 82,207 bp,and a small single-copy region(SSC)of 13,587 bp.Further,phylogenetic analyses were performed using nrDNA sequence and 79 coding sequences(CDSs)from 26 complete plastomes of subtribe Calypsoinae.The phylogenetic tree based on nrDNA sequence suggested that Corallorhiza is a monophyletic group,and strongly support C.sinensis as sister to the rest species of Corallorhiza.The plastid tree showed that 10 Corallorhiza species grouped into two clades and C.sinensis is most closely related to the North American C.striata and C.bentleyi instead of Oreorchis foliosa and O.angustata in the same clade.The plastid tree and nrDNA tree indicate Oreorchis is a paraphyletic.Although the topological conflicts are displayed between plastome and nrDNA phylogenies of C.sinensis,it is still the most closely related to Corallorhiza.Comparative analysis showed that C.sinensis populations are characteristic of the intermediate morphological traits between Corallorhiza and Oreorchis.The finding of this new species from China shed new light on the phylogeny of Oreorchis and Corallorhiza.展开更多
Objective:To analyse the rar gene repertoire and characterise the rhondroitin sulphate A (CSA)-binding activity of the Duffy-binding like(I)BI.) domains encoded by the var2csa gene of a Plasmodium falciparum(P.falcipa...Objective:To analyse the rar gene repertoire and characterise the rhondroitin sulphate A (CSA)-binding activity of the Duffy-binding like(I)BI.) domains encoded by the var2csa gene of a Plasmodium falciparum(P.falciparum) isolate in Hainan Province,China.Methods:The sequences of var DBL1 regions were PCR-amplified,sequenced and the sequence characteristics was bioinformalically analysed.Recombinant proteins encoded by the var2csa genes were expressed and purified.The binding activities of the recombinant proteins to CSA receptor was detected by ELISA assays.Results:Fifty six unique DBI.a sequences were obtained,and the sequences represented similar diversity to the var genes of the genome parasite 3D7.There are two var2csa genes in the P.falciparum isolated from Hainan Province.Unlike in other falciparum parasites such as HB3,the two var2csa genes are more diverged.The receptor-binding capacity of DBL-5εand DBI.-6 e domains of HN var2CSA was studied.Conclusions:This work represented the diversity of rar genes of a P.falciparum isolate in China.展开更多
Nuclear mass measurements provide valuable information on the nuclear binding energy which reflects the summed result of all interactions among its constituent protons and neutrons. The systematic and accurate knowled...Nuclear mass measurements provide valuable information on the nuclear binding energy which reflects the summed result of all interactions among its constituent protons and neutrons. The systematic and accurate knowledge of nuclear masses have wide application in many areas of subatomic physics ranging from nuclear structure and astrophysics to the fundamental interactions and symmetries depending on the achieved mass precision[1].展开更多
Isochronous mass spectrometry (IMS) in storage rings is a powerful tool for mass measurements of exotic nucle with very short half-lives down to several tens of microseconds, using a multicomponent secondary beam sepa...Isochronous mass spectrometry (IMS) in storage rings is a powerful tool for mass measurements of exotic nucle with very short half-lives down to several tens of microseconds, using a multicomponent secondary beam separated in-ight without cooling. However, the inevitable momentum spread of secondary ions limits the precision of nuclear masses determined by using IMS.展开更多
A radioactive nucleus is characterized with an intrinsic half-life. However, for a nuclear species, the half-lives inneutral atoms could be very different from that in highly charged ions. The half-lives of some highl...A radioactive nucleus is characterized with an intrinsic half-life. However, for a nuclear species, the half-lives inneutral atoms could be very different from that in highly charged ions. The half-lives of some highly charged ionshave been directly measured at GSI for multiple motivations[1]. In the same case, the nuclear state(i:e the isomer)may be in the range of several tens of microseconds and their half-live can be measured using isochronous massspectrometry. The J = 8+ isomeric state in 94Ru was chosen to test this method. The half-life of this isomer is71 s [2] in neutral atoms, and the excitation energy is 2.64 MeV. The internal conversion coefficient of this decayin neutral atom is 0.335. So its half-life in the bare nucleus would be modified to be 94.78 s when the internalconversion channel is blocked.展开更多
基金Project supported by the Science Fund of the Guangdong Major Project of Basic and Applied Basic Research,China(Grant No.2019B030302011)the Fund of the Science and Technology Program of Guangzhou,China(Grant No.202201010090)。
文摘Combining the first-principles calculations and structural enumeration with recognition,the delithiation process of LiNiO_(2)is investigated,where various supercell shapes are considered in order to obtain the formation energy of Li_(x)NiO_(2).Meanwhile,the voltage profile is simulated and the ordered phases of lithium vacancies corresponding to concentrations of 1/4,2/5,3/7,1/2,2/3,3/4,5/6,and 6/7 are predicted.To understand the capacity decay in the experiment during the charge/discharge cycles,deoxygenation and Li/Ni antisite defects are calculated,revealing that the chains of oxygen vacancies will be energetically preferrable.It can be inferred that in the absence of oxygen atom in high delithiate state,the diffusion of Ni atoms is facilitated and the formation of Li/Ni antisite is induced.
基金supported by the National Natural Science Foundation of China(Grant No.51875253 and No.51935012)the Jiangsu Provincial Key Research and Development Program(BE2022069-2)the Western Light Project of Chinese Academy of Sciences(sbzg-zdsys-202007)。
文摘Complex-shaped optical lenses are of great interest in the areas of laser processing,machine vision,and optical communications.Traditionally,the processing of complex optical lenses is usually achieved by precision machining combined with post-grinding or polishing,which is expensive,labor-intensive and difficult in the processing of ultra-complex optical lenses.Additive manufacturing is an emerging technology that provides significant advantages in producing highly intricate optical devices.However,the layer-by-layer method employed in such manufacturing processes has resulted in low printing speeds,as well as limitations in surface quality.To address these challenges,we apply tomographic volumetric printing(TVP)in this work,which can realize the integrated printing of complex structural models without layering.By coordinating the TVP and the meniscus equilibrium post-curing methods,ultra-fast fabrication of complex-shaped lenses with sub-nanometric roughness has been achieved.A2.5 mm high,outer diameter 9 mm spherical lens with a roughness value of RMS=0.3340 nm is printed at a speed of 3.1×10^(4)mm^(3)h^(-1).As a further demonstration,a complex-shaped fly-eye lens is fabricated without any part assembly.The designed spherical lens is mounted on a smartphone’s camera,and the precise alignments above the circuit board are captured.Upon further optimization,this new technology demonstrates the potential for rapid fabrication of ultra-smooth complex optical devices or systems.
基金Project of Orchid Biodiversity Survey of China from National Forestry and Grassland AdministrationNational Wild Plant Germplasm Resource Center for all kinds of support+1 种基金supported by the grants from the Second Tibetan Plateau Scientific Expedition and Research(STEP)program(2019QZKK0502)the National Natural Science Foundation of China(31970211)。
文摘Corallorhiza sinensis,a new species of mycoheterotrophic orchid from western Sichuan,China,is described and illustrated based on molecular and morphological evidence.It is morphologically similar to Corallorhiza trifida,but can be distinguished by bigger flowers,both sepals and petals with 3 veins,and longer lateral lobes of lip.To distinguish the new Corallorhiza species and explore its phylogenetic position within subtribe Calypsoinae,this study employed sequences of the nuclear ribosomal DNA(nrDNA)and whole plastome assembled from the genome skimming approach.The plastome is 148,124 bp in length,including a pair of inverted repeats(IRs)of 26,165 bp,a large single-copy region(LSC)of 82,207 bp,and a small single-copy region(SSC)of 13,587 bp.Further,phylogenetic analyses were performed using nrDNA sequence and 79 coding sequences(CDSs)from 26 complete plastomes of subtribe Calypsoinae.The phylogenetic tree based on nrDNA sequence suggested that Corallorhiza is a monophyletic group,and strongly support C.sinensis as sister to the rest species of Corallorhiza.The plastid tree showed that 10 Corallorhiza species grouped into two clades and C.sinensis is most closely related to the North American C.striata and C.bentleyi instead of Oreorchis foliosa and O.angustata in the same clade.The plastid tree and nrDNA tree indicate Oreorchis is a paraphyletic.Although the topological conflicts are displayed between plastome and nrDNA phylogenies of C.sinensis,it is still the most closely related to Corallorhiza.Comparative analysis showed that C.sinensis populations are characteristic of the intermediate morphological traits between Corallorhiza and Oreorchis.The finding of this new species from China shed new light on the phylogeny of Oreorchis and Corallorhiza.
基金supports to Q.Chen from the National Basic Research Program of China(973 Program,No.2007CB513100)national science and technology project(2008ZX-10004-011)NSFC grant to J.Yin (30771886),N.Jiang(81171592,)and Q.Chen(81130033)
文摘Objective:To analyse the rar gene repertoire and characterise the rhondroitin sulphate A (CSA)-binding activity of the Duffy-binding like(I)BI.) domains encoded by the var2csa gene of a Plasmodium falciparum(P.falciparum) isolate in Hainan Province,China.Methods:The sequences of var DBL1 regions were PCR-amplified,sequenced and the sequence characteristics was bioinformalically analysed.Recombinant proteins encoded by the var2csa genes were expressed and purified.The binding activities of the recombinant proteins to CSA receptor was detected by ELISA assays.Results:Fifty six unique DBI.a sequences were obtained,and the sequences represented similar diversity to the var genes of the genome parasite 3D7.There are two var2csa genes in the P.falciparum isolated from Hainan Province.Unlike in other falciparum parasites such as HB3,the two var2csa genes are more diverged.The receptor-binding capacity of DBL-5εand DBI.-6 e domains of HN var2CSA was studied.Conclusions:This work represented the diversity of rar genes of a P.falciparum isolate in China.
文摘Nuclear mass measurements provide valuable information on the nuclear binding energy which reflects the summed result of all interactions among its constituent protons and neutrons. The systematic and accurate knowledge of nuclear masses have wide application in many areas of subatomic physics ranging from nuclear structure and astrophysics to the fundamental interactions and symmetries depending on the achieved mass precision[1].
文摘Isochronous mass spectrometry (IMS) in storage rings is a powerful tool for mass measurements of exotic nucle with very short half-lives down to several tens of microseconds, using a multicomponent secondary beam separated in-ight without cooling. However, the inevitable momentum spread of secondary ions limits the precision of nuclear masses determined by using IMS.
文摘A radioactive nucleus is characterized with an intrinsic half-life. However, for a nuclear species, the half-lives inneutral atoms could be very different from that in highly charged ions. The half-lives of some highly charged ionshave been directly measured at GSI for multiple motivations[1]. In the same case, the nuclear state(i:e the isomer)may be in the range of several tens of microseconds and their half-live can be measured using isochronous massspectrometry. The J = 8+ isomeric state in 94Ru was chosen to test this method. The half-life of this isomer is71 s [2] in neutral atoms, and the excitation energy is 2.64 MeV. The internal conversion coefficient of this decayin neutral atom is 0.335. So its half-life in the bare nucleus would be modified to be 94.78 s when the internalconversion channel is blocked.
