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A new species of the genus Leptolalax (Anura： Megophryidae) from southern Vietnam

Zoological Research 2018年第3期39卷 185-201页

作者： tang van duong Dang Trong Do Chung Dac Ngo Truong Quang Nguyen Nikolay A. Poyarkov Vietnam National Museum of Nature Vietnam Academy of Science and Technology Hanoi Vietnam Department of Vertebrate Zoology Biological FacultyLomonosov Moscow State University Moscow 119234 Russia Faculty of Natural Sciences Phu Yen University Tuy Hoa Phu Yen Vietnam College of Education Hue University Hue Vietnam Institute of Ecology and Biological Resources Vietnam Academy of Science and Technology Hanoi Vietnam Graduate University of Science and Technology Vietnam Academy of Science and Technology Cau Giay Hanoi Vietnam Joint Russian- Vietnamese Tropical Research and Technological Center Nghia Do Cau Giay Hanoi Vietnam

We describe a new species of megophryid frog from Phu Yen Province in southern Vietnam. Leptolalax macrops sp. nov. is distinguished from its congeners by a combination of the following morphological attributes：（1） body size medium （SVL 28.0-29.3 mm in three adult males, 30.3 mm in single adult female）; （2） supra-axillary glands present, creamy white; ventrolateral glands indistinct; （3） tympanum externally distinct; （4） dorsal skin roughly granular with larger tubercles, dermal ridges on dorsum absent; （5） rudimentary webbing present between fingers I-II and I1-111; rudimentary webbing between all toes; fingers and toes without dermal fringes; （6） in life ventral surface greyish-violet with white speckling; （7） supratympanic fold distinct, dark brown in life; （8） iris bicolored, typically golden in upper half, fading to golden green in lower half; （9） tibia short （TbL/SVL 0.44-0.45 in males）; and （10） eyes large and protuberant （ED/SVL 0.15-0.16 in males） From all congeners for which comparable sequences are available, the new species differs markedly in the 16S rRNA mitochondrial gene sequence （P-distance〉5.7%）. The new species is currently known only from montane evergreen tropical forests of Song Hinh District, Phu Yen Province, and M＇Drak District of Dak Lak Province at elevations of 470-630 m a.s.l.. We suggest the new species should be considered as Data Deficient following the IUCN＇s Red List categories. We also report a previously unknownLeptolalax mtDNA lineage from an evergreen tropica forest in the Hoa Thinh District of Phu Yen Province which may also represent an undescribed species.

关键词： Leptolalax macrops sp. nov. Phu YenProvince Dak Lak Province Southern coastal regionof Vietnam

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A new genus and three new species of miniaturized microhylid frogs from Indochina(Amphibia: Anura:Microhylidae: Asterophryinae)

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Zoological Research 2018年第3期39卷 130-157页

作者： Nikolay A.Poyarkov Chatmongkon Suwannapoom Parinya Pawangkhanant Akrachai Aksornneam tang van duong Dmitriy V.Korost Jing Che Department of Vertebrate Zoology Biological Faculty Lomonosov Moscow State University Joint Russian-Vietnamese Tropical Research and Technological Center 3. Division of Fishery School of Agriculture and Natural Resources University of Phayao 4. Department of Zoology Faculty of Science Kasetsart University Vietnam National Museum of Nature Vietnam Academy of Science and Technology Petroleum Geology Department Geological Faculty Lomonosov Moscow State University 7. State Key Laboratory of Genetic Resources and Evolution Kunming Institute of Zoology Chinese Academy of Sciences Southeast Asia Biodiversity Research Institute Chinese Academy of Sciences

We report on the discovery of a new genus of microhylid subfamily Asterophryinae from northern and eastern Indochina, containing three new *** Gen. nov. are secretive miniaturized frogs(SVL<21 mm) with a mostly semi-fossorial lifestyle. To assess phylogenetic relationships, we studied 12 S rRNA – 16 S rRNA mt DNA fragments with a final alignment of 2 591 bp for 53 microhylid species. Morphological and osteological characters were analyzed using micro-CT scanning and used to describe the new genus. Results of phylogenetic analyses assigned the new genus into the mainly Australasian subfamily Asterophryinae as a sister taxon to the genus Siamophryne from southern Indochina. The three specimens collected from Gia Lai Province in central Vietnam, Cao Bang Province in northern Vietnam, and Chiang Rai Province in northern Thailand proved to be separate species, different both in morphology and genetics(genetic divergence 3.1%≤P≤5.1%). Our work provides further evidence for the "out of Indo-Eurasia"scenario for Asterophryinae, indicating that the initial cladogenesis and differentiation of this group of frogs occurred in the Indochina Peninsula. To date, each of the three new species of Vietnamophryne Gen. nov. is known only from a single specimen; thus,their distribution, life history, and conservation status require further study.

关键词： Vietnamophryne Gen. nov. Vietnamophryne inexpectata sp. nov. Vietnamophryne orlovi sp. nov. Vietnamophryne occidentalis sp. nov. Siamophryne Gastrophrynoides mtDNA micro-CT scanning Vietnam Thailand Herpetofauna Amphibia Biogeography Taxonomy Indochina

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Inheritance of the exciton geometric structure from Bloch electrons in two-dimensional layered semiconductors

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Frontiers of physics 2024年第4期19卷 25-35页

作者： Jianju tang Songlei Wang Hongyi Yu Guangdong Provincial Key Laboratory of Quantum Metrology and Sensing&School of Physics and Astronomy Sun Yat-sen University(Zhuhai Campus)Zhuhai 519082China State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-sen University(Guangzhou Campus)Guangzhou 510275China

We theoretically studied the exciton geometric structure in layered semiconducting transition metal *** on a three-orbital tight-binding model for Bloch electrons which incorporates their geometric structures,an effective exciton Hamiltonian is constructed and solved perturbatively to reveal the relation between the exciton and its electron/hole *** show that the electron−hole Coulomb interaction gives rise to a non-trivial inheritance of the exciton geometric structure from Bloch electrons,which manifests as a valley-dependent center-of-mass anomalous Hall velocity of the exciton when two external fields are applied on the electron and hole constituents,*** obtained center-of-mass anomalous velocity is found to exhibit a non-trivial dependence on the fields,as well as the wave function and valley index of the *** findings can serve as a general guide for the field-control of the valley-dependent exciton transport,enabling the design of novel quantum optoelectronic and valleytronic devices.

关键词： transition metal dichalcogenides exciton geometric structure Berry curvature van der Waals stacking

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Structure-Preserving Recurrent Neural Networks for a Class of Birkhoffian Systems

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Journal of Systems Science & Complexity 2024年第2期37卷 441-462页

作者： XIAO Shanshan CHEN Mengyi ZHANG Ruili tang Yifa LSEC ICMSECAcademy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing 100190China School of Mathematical Sciences University of Chinese Academy of SciencesBeijing 100049China School of Mathematics and Statistics Beijing Jiaotong UniversityBeijing 100044China

In this paper,the authors propose a neural network architecture designed specifically for a class of Birkhoffian systems—The Newtonian *** proposed model utilizes recurrent neural networks(RNNs)and is based on a mathematical framework that ensures the preservation of the Birkhoffian *** authors demonstrate the effectiveness of the proposed model on a variety of problems for which preserving the Birkhoffian structure is important,including the linear damped oscillator,the van der Pol equation,and a high-dimensional *** with the unstructured baseline models,the Newtonian neural network(NNN)is more data efficient,and exhibits superior generalization ability.

关键词： Birkhoffian system k(z,t)-symplectic neural networks recurrent neural network

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Theoretical study on magnetocaloric effect and its electric-field regulation in CrI_(3)/metal heterostructure

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Science China(Physics,Mechanics & Astronomy) 2024年第2期67卷 134-141页

作者： Weiwei He Ziming tang Qihua Gong Min Yi Wanlin Guo State Key Laboratory of Mechanics and Control for Aerospace Structures Key Laboratory for Intelligent Nano Materials and Devices of Ministry of EducationInstitute for Frontier ScienceNanjing University of Aeronautics and AstronauticsNanjing 210016China MIIT Key Laboratory of Aerospace Information Materials and Physics College of PhysicsNanjing University of Aeronautics and AstronauticsNanjing 211106China

The extraordinary properties of a heterostructure by stacking atom-thick van der Waals(vdW)magnets have been extensively ***,the magnetocaloric effect(MCE)of heterostructures that are based on monolayer magnets remains to be ***,we deliberate MCE of vd W heterostructure composed of a monolayer CrI_(3)and metal atomic layers(Ag,Hf,Au,and Pb).It is revealed that heterostructure engineering by introducing metal substrate can improve MCE of CrI_(3),particularly boosting relative cooling power to 471.72μJ m^(-2)and adiabatic temperature change to 2.1 K at 5 T for CrI_(3)/*** improved MCE is ascribed to the enhancement of magnetic moment and intralayer exchange coupling in CrI_(3)due to the CrI_(3)/metal heterointerface induced charge *** field is further found to tune MCE of CrI_(3)in heterostructures and could shift the peak temperature by around 10 K in CrI_(3)/Hf,thus manipulating the working temperature window of *** theoretical results could enrich the research on low-dimensional magnetocaloric materials.

关键词： magnetocaloric effect heterostructure metal substrate

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STRONG INSTABILITY OF STANDING WAVES FOR A SYSTEM NLS WITH QUADRATIC INTERACTION

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Acta Mathematica Scientia 2020年第2期40卷 515-528页

作者： van duong DINH Laboratoire Paul PainleveUMR 8524 Universitede Lille CNRS59655 Villeneuve d'AscqCedexFrance Department of Mathematics HCMC University of Pedagogy280 An Duong VuongHo Chi MinhVietnam

We study the strong instability of standing waves for a system of nonlinear Schr¨odinger equations with quadratic interaction under the mass resonance condition in dimension d=5.

关键词： System NLS quadratic interaction ground states instability blow-up

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Evaluation of the binding affinity and antioxidant activity of phlorizin to pepsin and trypsin

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Food Science and Human Wellness 2024年第1期13卷 392-400页

作者： Jing Zhang Lan tang Xia Hu Zhen Zeng Wen Wu Fang Geng Hui Li Di Wu Meat Processing Key Laboratory of Sichuan Province School of Food and Biological EngineeringChengdu UniversityChengdu 610106China School of Chemical Engineering Sichuan UniversityChengdu 610065China

Phlorizin(PHL)is a natural compound with strong antioxidant properties mainly found in *** this paper,the interaction mechanism of PHL with pepsin and trypsin was comparatively evaluated by computer simulation,fluorescence spectra,circular dichroism(CD),and Fourier transform infrared(FT-IR)spectra at a molecular *** spectra showed that PHL quenches the pepsin/trypsin by static *** parameters indicated that PHL binds to pepsin mainly through hydrogen bonds and van der Waals forces,and that of trypsin was electrostatic *** ground state complexes PHL and protease have a moderate affinity of 105 L/mol PHL binds more strongly to trypsin than to *** and FT-IR spectra results showed that pepsin/trypsin decreased theβ-sheet content and slightly changed its secondary structure upon *** experimental results are mutually verified with the predicted computer-aid simulation *** PHL and trypsin binding,the antioxidant capacity of PHL was ***,the antioxidant capacity of PHL was decreased after binding to *** work elucidates the binding of PHL binding mechanisms to pepsin/trypsin and provides useful information for the digestion of PHL to improve the application of PHL in food processing.

关键词： Interaction Phlorizin Pepsin Trypsin Antioxidation

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Two-dimensional polarized MoSSe/MoTe2 van der Waals heterostructure: A polarization-tunable optoelectronic material

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Frontiers of physics 2024年第1期19卷 251-257页

作者： Fahhad Alsubaie Munirah Muraykhan Lei Zhang Dongchen Qi Ting Liao Liangzhi Kou Aijun Du Cheng tang School of Chemistry and Physics Centre for Materials ScienceQueensland University of TechnologyBrisbaneQLD 4001Australia School of Mechanical Medical and Process EngineeringQueensland University of TechnologyBrisbaneQLD 4001Australia

Two-dimensional (2D) heterostructures have shown great potential in advanced photovoltaics due to their restrained carrier recombination, prolonged exciton lifetime and improved light absorption. Herein, a 2D polarized heterostructure is constructed between Janus MoSSe and MoTe_(2) monolayers and is systematically investigated via first-principles calculations. Electronically, the valence band and conduction band of the MoSSe−MoTe_(2) (MoSeS−MoTe_(2)) are contributed by MoTe_(2) and MoSSe layers, respectively, and its bandgap is 0.71 (0.03) eV. A built-in electric field pointing from MoTe_(2) to MoSSe layers appears at the interface of heterostructures due to the interlayer carrier redistribution. Notably, the band alignment and built-in electric field make it a direct z-scheme heterostructure, benefiting the separation of photogenerated electron-hole pairs. Besides, the electronic structure and interlayer carrier reconstruction can be readily controlled by reversing the electric polarization of the MoSSe layer. Furthermore, the light absorption of the MoSSe/MoTe_(2) heterostructure is also improved in comparison with the separated monolayers. Consequently, in this work, a new z-scheme polarized heterostructure with polarization-controllable optoelectronic properties is designed for highly efficient optoelectronics.

关键词： MoSSe MoTe2 photovoltaics ferroelectric heterostructure

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Transport of graphene oxide in the capillary fringe:Insights from sandbox experiments and numerical simulation

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Emerging Contaminants 2024年第3期10卷 103-110页

作者： Taotao Lu Feiyu Chen Xiaochen Liu Xue Bai Hao Peng Shuangcheng tang College of Hydraulic Science and Engineering Yangzhou UniversityYangzhou225009China Hydrogeology and Engineering Geology Institute of Hubei Geological Bureau Jinzhou434020China College of Environment and Civil Engineering Chengdu University of TechnologyChengdu610059China

Studying contaminant transport in the capillary fringe(CF),a crucial part of the vadose zone,offers insights into the mechanisms controlling pollution in soils and groundwater *** paper investigated contaminant transport in the CF by continuously injecting a conservative tracer(NaCl)and graphene oxide nanoparticle(GONP),an adsorptive contaminant,into a *** entering the CF from the unsaturated zone,both NaCl and GONP underwent lateral *** breakthrough curves(BTCs)for NaCl and GONP were derived from water samples collected at predetermined sampling ***,contaminant transport in the CF was modeled using a one-dimensionaletwo-dimensional(1D-2D)coupled hydrodynamic *** model incorporated lateral dispersivity(aL=1.198 cm)and longitudinal dispersivity(aT=0.286 cm),calculated using a point-by-point *** hydrodynamic dispersion coefficients obtained were then applied to the Brooks and Corey(BC)and the van Genuchten(VG)parametric *** BC model more accurately simulated the NaCl migration compared to the VG model,leading to its application in simulating GONP transport in the ***,the simulated BTCs for GONP showed a lag behind the measured data,especially at high ionic *** discrepancy was attributed to the variable adsorption partition coefficient of GONP under different ionic *** the experiment,GONP adsorption onto the porous media's surface altered the capillary dynamics,notably increasing capillary rise height,decreasing seepage velocity,and reducing GONP ***,it is necessary to consider the adsorption capacity of the contaminants in order to accurately assess their transport within the vadose zone.

关键词： Capillary fringe Transport Sandbox experiment Numerical simulation

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Highly efficient tunable photodetector with a bipolar response in van der Waals heterojunctions

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Science China(Technological Sciences) 2024年第2期67卷 639-646页

作者： SHI ChaoFan ZHANG Shi XIAO KeNing ZHANG LiBo HAN Li ZHU YuLin tang WeiWei LIU ChangLong LI GuanHai CHEN XiaoShuang College of Physics and Optoelectronic Engineering Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of Sciences Hangzhou310024China State Key Laboratory of Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai 200083China

The heterojunction integration of two-dimensional(2D)materials via van der Waals(vdW)forces,unencumbered by lattice and processing constraints,constitutes an efficacious approach to enhance the overall optoelectronic performance of photodetectors,due to an assortment of distinctive light-matter ***,vdW heterojunction photodetectors based on transition metal dichalcogenides(TMDs)face an inevitable trade-off between low dark currents and high responsivity,curtailing the application potential of myriad novel optoelectronic components in sensing,spectral,and communication *** this study,we present the successful actualization of a highly sensitive,self-powered,and gate-tunable bipolar response *** mechanisms underlying photocurrent generation were scrutinized via bias-,power-,and position-dependent mapping photoresponse measurements,identifying the photovoltaic effect,which is attributable to the Schottky junction’s built-in electric field,as the predominant *** prototype Au-WS2-graphene photodetector exhibits a remarkable light on/off ratio of 1.2×10^(6),a specific detectivity of 6.12×10^(11)cm H^(z1/2)W^(-1)with 20μs response time at 638 *** wide gate-tunable responsivity provides an adjustability scope,ranging from 0.9 to 3.1 A W^(-1).Notably,the device demonstrates an exceptional linear photocurrent response,with a linear dynamic range(LDR)value approximating 130 dB,which significantly surpasses that of other photodetectors based on TMDs.

关键词： WS2/graphene van der Waals heterojunction gate-tunable bipolar response

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