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Mitogenome-based phylogeny of mosquitoes(Diptera:Culicidae)

Insect Science 2024年第2期31卷 599-612页

作者： de-hong chen Shu-Lin He Wen-Bo Fu Zhen-Tian Yan Yun-Jian Hu Huan Yuan Ming-Bin Wang Bin chen Chongqing Key Laboratory of Vector Insects Institute of Entomology and Molecular BiologyChongqing Normal UniversityChongqingChina

Mosquitoes are of great medical significance as vectors of many deadly *** have been widely used in phylogenetic studies,but mitogenome knowledge within the family Culicidae is limited,and Culicidae phylogeny is far from *** this study,we surveyed the mitogenomes of 149 Culicidae species,including 7 newly sequenced *** analysis of 149 mosquito mitogenomes shows gene composition and order to be identical to that of an ancestral insect,and the AT bias,length variation,and codon usage are all consistent with that of other reported Dipteran *** analyses based on the DNA sequences of the 13 protein-coding genes from the 149 species robustly support the monophyly of the subfamily Anophelinae and the tribes Aedini,Culicini,Mansonini,Sabethini,and *** resolve ambiguous relationships between clades within the subfamily Culicinae,we performed topological tests and show that Aedini is a sister to Culicini and that Uranotaenini is a sister to(Mansonini)+(Toxorhynchitini+Sabethini).In addition,we estimated divergence times using a Bayesian relaxation clock based on the sequence data and 3 fossil calibration *** results show mosquitoes diverged during the Early Jurassic with massive Culicinae radiations during the Cretaceous,coincident with the emergence of angiosperms and the burst of mammals and ***,this study,which uses the largest number of Culicidae mitogenomes sequenced to date,comprehensively reveals the mitogenome characteristics and mitogenome-based phylogeny and divergence times of Culicidae,providing information for further studies on the mitogenome,phylogeny,evolution,and taxonomic revision of Culicidae.

关键词： characterization Culicidae evolution mitogenomes mosquitoes phylogeny

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Electrochemical formation of La-Al intermetallic compounds in fluoride melts

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Rare Metals 2023年第9期42卷 3170-3176页

作者： Ping Pan Shi-hong Yan Lin Zhou de-hong chen hong-Bo Yang Rui-Ying Miao National Engineering Research Center for Rare Earth Materials General Research Institute for Nonferrous MetalsBeijing100088China Grirem Advanced Materials Co. Beijing100088China

The electrochemical formation of La-Al alloys in LiF-CaF_(2)molten salt on a molybdenum electrode at 1123 K was investigated by electrochemical techniques,such as cyclic voltammetry,square-wave voltammetry and open-circuit *** formation signals of four types of Al-La intermetallic compounds were *** Al-La alloy was obtained through galvanostatic electrolysis at 2.5 A·cm^(-2)for 3 *** phase composition and microstructure of the electrolytic products were analysed by X-ray diffraction(XRD)and scanning electron microscopy with energy-dispersive spectroscopy(EDS).XRD results show that the phase compositions of the alloys are Al_(11)La_(3)and Al,and EDS results reveal 26.7 at%La in the alloy.

关键词： Co-reduction Lanthanum aluminium alloys Molten fluorides

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Formation mechanism and preparation of YAl_(2) intermetallics by electro-deoxidation with different sintering conditions

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Rare Metals 2023年第3期42卷 1067-1074页

作者： Yue-Shan Wei Shi-hong Yan Lin Zhou de-hong chen Rui-Ying Miao Zhi-Qiang Wang National Engineering Research Center for Rare Earth Materials General Research Institute for Nonferrous MetalsBeijing 100088China Grirem Advanced Materials Co. Beijing 100088China

A study was carried out on the preparation of YAl_(2) intermetallics from mixed oxide precursors using the method of electro-deoxidation.Y2O_(3) and Al_(2)O_(3) mixed in molar proportions of 1:2 were sintered at temperatures ranging from 800 to 12000C for different *** sintered pellet was then electrolyzed in a molten CaCl_(2) at850℃using a graphite anode at a potential of 3.1 *** this work,effects of sintering on the composition and the oxygen content in cathodic products were studied by X-ray diffraction(XRD)and oxygen-nitrogen *** mainly affects the porosity of the pellets,and it is found that porosity decreases gradually with the increase in sintering temperature and the extension of sintering *** sintered at 9000C for 4 h,the oxygen content in the cathodic product decreases to 1.85 wt%,and the efficiency of electro-deoxidation is 94.48%.At the same time,the mechanism of electrolysis was *** results suggest that the formation of YAl_(2) is a multi-step *** the reduction process from mixed oxides Y2O_(3)/Al_(2)O_(3) to YAl_(2) included many intermediate materials,such as YAlO_(3),Y3Al5O12 and YAl3,YAl_(2) intermediate alloy was prepared finally.

关键词： Yttrium aluminum oxide Molten salts YAl_(2)alloy Electro-deoxidation

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Synthesis of Monodisperse α-Fe_2O_3 Particles in Short Periods

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Chinese Chemical Letters 2003年第3期14卷 323-326页

作者： Yu Ting ZHAO de hong chen Dai Rong chen Xiu Ling JIAO department of Chemistry Shandong UniversityJinan 250100

Monodisperse a-Fe2O3 particles with different particle size (ca. 62010 nm or 604 nm) have been successfully prepared by hydrothermal method in short periods. In this process, the crystal-growing inhibitor (DBS) favor... 详细信息

关键词： Hematite hydrothermal method monodisperse particles.

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Synthesis of NiFe_2O_4 Powders Well defined in Size and Morphologies

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Chinese Chemical Letters 2002年第4期13卷 389-392页

作者： Yu Ting ZHAO de hong chen Dai Rong chen Xiu Ling JIAO department of Chemistry Shandong UniversityJinan 250100

The uniform NiFe2O4 powders with different particle size and morphologies (octahedral, cubic and spherical) have been prepared from different precursors via hydrothermal process. The nanocrystallines derived from pre... 详细信息

关键词： Nickel ferrite hydrothermal method superparamagnetism.

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Removal and occurrence state transformation of Ti impurity in Gd metal

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Rare Metals 2021年第8期40卷 2320-2326页

作者： Zhen-Fei Yang Si-Ming Pang Shi-hong Yan hong-Bo Yang Xiao-Wei Zhang Qiong Zhu de-hong chen Dao-Gao Wu General Research Institute for Nonferrous Metals Beijing100088China National Engineering Reseach Center for Rare Earth Materials Grirem Advanced Materials Co.Ltd.Beijing100088China

The interaction mechanism of B and Ti in liquid Gd metal was theoretically analyzed,and the occurrence state transformation and removal of Ti impurity were experimentally analyzed in this *** research results indicated that the B additive reacted with the Ti impurity in liquid Gd metal to form the high-melting-point TiB_(2)at 1673 *** to the low density of TiB_(2)that is far lower than that of Gd,TiB_(2)floated up to the liquid surface,and then,the Ti impurity could be effectively removed from Gd *** melting time and increasing B additive amount could increase Ti removal rate,but the increase in the rate slows beyond a certain duration and B *** recommended operating parameter,melting time of 60 min and B additive content of 0.1394 wt%could reduce Ti content from 0.1534 wt%to 0.0433 wt%,and the removal rate was 71.9%.

关键词： Gd metal Ti impurity B additive TiB_(2)

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Migration regularities of impurities C,O,Fe,Co and Ni and effect of crystal transition on C,O and Fe in purification of metal La by solid-state electrotransport

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Rare Metals 2021年第10期40卷 2985-2992页

作者： Jia-Min Zhong de-hong chen Si-Ming Pang Zong-An Li Lin Zhou Zhi-Qiang Wang National Engineering Research Center for Rare Earth Materials Grirem Advanced Materials Co.Ltd.Beijing 100088China

Migration regularities of impurities C,O,Fe,Co and Ni and the effect of crystal transition on C,O and Fe in purification of metal La by solid-state electrotransport(SSE)were *** impurity migration direction,removal extent and difficulty were intuitively judged by impurity residual rate distribution *** is indicated that major impurities Fe,Co,Ni,C and O in metal La are found to significantly migrate to anode and migration effects are much better with the increase in temperature and prolongation of time in purification of La by *** Fe,Co and Ni in La may be fast diffusion elements,which are very extreme to be removed,and removal difficulty is in the order of Fe

关键词： Solid-state electrotransport Puriﬁcation Lanthanum Impurity distribution Residual rate Crystal transition

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Electrode connection optimization for both temperature difference and purification of lanthanum rod during solid-state electrotransport

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Rare Metals 2023年第2期42卷 713-718页

作者： Jia-Min Zhong Zong-An Li Xiao-Wei Zhang Lin Zhou Zhi-Qiang Wang de-hong chen National Engineering Research Center for Rare Earth Materials Grirem Advanced Materials Co.Ltd.General Research Institute for Nonferrous MetalsBeijing100088China

In order to solve the problem of large temperature difference between the center and ends of the metallic rod in the purification process of solid-state electrotransport(SSE),three types of electrode connections of tantalum and the corresponding rods of metallic lanthanum were designed,the temperature distributions of three kinds of rod were measured,and the influence of temperature difference on the purification effect of solid-state electrotransport was *** results indicate that the maximum temperature difference of the rod will be significantly reduced through decreasing the cross section of electrode connection to make its unit length resistance close to that of rod,or increasing the unit length resistance of the section at both ends of the *** these two measures are adopted at the same time,the effect of decreasing rod temperature difference is the best in the present study,and the maximum temperature difference of the rod can be reduced to 29℃when the maximum temperature of the rod is 820℃.The migration velocity of the impurities at rod ends can be obviously improved after the rod temperature difference is reduced,which enables the purification effect and efficiency of solid-state electrotransport to be greatly raised;it is also found that the major impurities iron in metallic lanthanum migrates more easily than oxygen and carbon during the purification of metal lanthanum with solid-state electrotransport.

关键词： Solid-state electrotransport Electrode connection Temperature difference Metallic lanthanum Purification effect

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Migration regularities of impurity aluminum and copper in purification of metal lanthanum by solid-state electrotransport

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Rare Metals 2021年第8期40卷 2307-2312页

作者： Zhi-Qiang Wang Zong-An Li Jia-Min Zhong de-hong chen Xiao-Wei Zhang Lin Zhou National Engineering Research Center for Rare Earth Materials Grirem Advanced Materials Co.Ltd.General Research Institute for Nonferrous MetalsBeijing100088China

In view of the previous studies on the migrations of impurity aluminum(Al)and copper(Cu)in purification of rare earth metal by solid-state electrotransport(SSE),there are still some questions about that which direction they migrate to and whether there are significant migrations or *** metal lanthanum(La)was used as research object,and the effects of migration temperature and time on the distributions and migration regularities of impurity Al and Cu were investigated in the present study by increasing concentration of impurity Al and Cu in raw metal *** impurity migration direction and removal difficulty were intuitively judged by the residual rate distribution curve of *** is indicated that metal impurity Al and Cu in metal La at 800℃ with direct current are found to significantly migrate to anode and their residual rates near cathode decrease with the increase in migration temperature and prolongation of migration *** relatively large vapor pressure of Al and Cu makes their residual rate distribution curves being low in middle and high in *** metal La was continuously purified for 100 h at 800℃ by SSE,the residual rates of impurity Al and Cu at 20 mm from cathode are 68.43%and 57.43%,respectively,showing that Cu is much easier to be removed than Al.

关键词： Solid-state electrotransport Purification Residual rate Rare earth metal Lanthanum

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Mixed H_(∞)/Passive Exponential Synchronization for delayed Memristive Neural Networks with Switching Event-Triggered Control

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Journal of Systems Science & Complexity 2024年第1期37卷 294-317页

作者： WU Wenhuang GUO Lulu chen hong Shanghai Research Institute for Intelligent Autonomous Systems Tongji UniversityShanghai 200092China department of Control Science and Engineering Tongji UniversityShanghai 201804China

This paper is devoted to event-triggered synchronization of delayed memristive neural networks with H∞and passivity *** aim is to guarantee the exponential synchronization and mixed H∞and passivity control for memristive neural networks by using event-triggered ***,a switching system is constructed under the event-triggered control ***,by adopting a piece-wise Lyapunov functional,a sufficient condition is established for the exponential synchronization and mixed H_(∞)and passivity ***,an event-triggered controller design scheme is proposed using matrix decoupling ***,the effectiveness of the designed controller is exemplified by a numerical example.

关键词： Event-triggered control exponential synchronization memristive neural networks time delays.

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