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Resurvey After 20 Years:Updating the Distribution,Population,and Potential Threats of the Chinting Alpine Toad

Asian Herpetological Research 2024年第2期15卷 73-81页

作者： Yuezheng FAN Qingfeng CHEN yuwen cheng Kaicheng TANG Ling SUN Yonghao HUANG Lan ZHAO Dong LIANG Xiaoyi WANG Junhua HU chengdu Institute of Biology Chinese Academy of SciencesChengdu 610041SichuanChina University of Chinese Academy of Sciences Beijing 100049China The State-owned Forest Farm of Hongya County Meishan 620360SichuanChina Sichuan Mt.Emei Forest Ecosystem National Observation and Research Station Leshan 614201SichuanChina

Considering the increased anthropogenic impacts,species with a limited range and low detectability often lack fundamental information and conservation actions,placing them at a high risk of *** Chinting alpine toad Scutiger chintingensis is a rare mountain amphibian endemic to the eastern margin of the Qinghai-Xizang Plateau in *** its whole distribution range,only three known populations(Wolong,Emei,and Wawu)exist and no recent population status report has been documented for this species over the past two *** 2020 to 2023,we investigated the species distribution,and assessed the risk factors for the main *** recorded this species in all distribution areas,and updated a new distribution site with a lower elevation *** relative population density was 0.024±0.012 ind./m^(2)on Mount Emei,whereas only 0.008±0.017 ind./m^(2)on Mount *** significant difference was observed in the number of individuals between the two populations;however,the relative population density was significantly *** and waste discharge resulting from the construction of scenic areas,as well as disturbances from tourism,were the primary anthropogenic factors that influenced the survival of this *** results provide the updated information on the distribution and population status of the Chinting alpine toad,and suggest that unrecorded populations,as well as a wider elevation range,may exist for this *** findings emphasise the importance of timely updates of species distribution and population information and offer a basis for the future conservation of endangered amphibians.

关键词： distribution endemic amphibian population size Scutiger chintingensis threat factor

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Performance of a tubular oxygen-permeable membrane reactor for partial oxidation of CH_4 in coke oven gas to syngas

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Journal of Natural Gas Chemistry 2010年第3期19卷 280-283页

作者： yuwen Zhang Hongwei cheng Jiao Liu Weizhong Ding Shanghai Key Laboratory of Modern Metallurgy ＆ Materials Processing Shanghai University Shanghai 200072 China

A gas-tight BaCo 0.7 Fe 0.2 Nb 0.1 O 3-δ（BCFNO） tubular membrane was fabricated by hot pressure *** a membrane reactor with BCFNO tubular membrane and Ag-based sealant was readily constructed and applied to partial oxidation of CH4 in coke oven *** 875 ℃,95% of methane conversion,91% of H 2 and as high as 10 ml cm-2·min-1 of oxygen permeation flux were *** was a good match in the coefficient of thermal expansion between Ag-based alloy and BCFNO membrane *** tubular BCFNO membrane reactor packed with Ni-based catalysts exhibited not only high activity but also good stability in hydrogen-enriched coke oven gas（COG） atmosphere.

关键词： tubular oxygen-permeable membrane reactor partial oxidation coke oven gas hydrogen production

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Promoting polysulfide conversions via cobalt single-atom catalyst for fast and durable lithium-sulfur batteries

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Nano Research 2023年第7期16卷 9335-9343页

作者： Ziwei Wang yuwen cheng Shanying Wang Jie Xu Bo Peng Dan Luo Lianbo Ma Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials&School of Materials Science and Engineering Anhui University of TechnologyMaanshan 243002China School of Information and Optoelectronic Science and Engineering South China Normal UniversityGuangzhou 510006China Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and Technology(HKUST)Clear Water BayHong Kong 999077China

Although promising strategies have been developed to resolve the critical drawbacks of lithium-sulfur(Li-S)batteries,the intractable issues including undesirable shuttling of polysulfides and sluggish redox reaction kinetics have still been unresolved ***,a cobalt single-atom(CoSA)catalyst comprising of atomic Co distributed homogeneously within nitrogen(N)-doped porous carbon(Co-NPC)nanosphere is constructed and utilized as a separator coating in Li-S *** Co-NPC exposes abundant active sites participating in sulfur redox reactions,and remarkable catalytic activity boosting the rapid polysulfide *** a result,Li-S batteries with Co-NPC coating layer realize significantly enhanced specific capacity(1295 mAh·g^(-1)at 0.2 C),rate capability(753 mAh·g^(-1)at 3.0 C),and long-life cyclic stability(601 mAh·g^(-1)after 500 cycles at 1.0 C).Increasing the areal sulfur loading to 6.2 mg·cm^(-2),an extremely high areal capacity of 7.92 mAh·cm^(-2)is *** in situ X-ray diffraction,density functional theory calculations,and secondary ion mass spectrometry confirm the high catalytic capability of CoSA towards reversible polysulfide *** study supplies new insights for adopting single-atom catalyst to upgrade the electrochemical performance of Li-S batteries.

关键词： lithium-sulfur batteries polysulfide shuttling sluggish redox kinetics cobalt single-atom catalyst catalytic capability

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Ti基MXenes表面氮气还原机理的第一性原理研究

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安徽工业大学学报（自然科学版） 2024年第3期41卷 265-275页

作者：邵翠萍王文杰程育汶安徽工业大学材料科学与工程学院安徽马鞍山243002 安徽工业大学先进金属材料绿色制造与表面技术教育部重点实验室安徽马鞍山243002

基于第一性原理,计算二维过渡金属碳氮化物(MXenes)Ti_(2)CT_(2)和Ti_(3)C_(2)T_(2)(T=O^(*)或OH^(*))催化剂表面N_(2)吸附前后的态密度(DOS)、反应中间结构的吉布斯自由能(△G)、差分电荷(CDD)、功函数φ及活化能(E_(a)),探究OH^(*)终端MXene表面发生N_(2)还原反应(NRR)反应的机制。结果发现:N_(2)在Ti_(2)CO_(2)和Ti_(3)C_(2)O_(2)表面发生物理吸附(△q≈0e),在Ti_(2)C(OH)_(2)和Ti_(3)C_(2)(OH)_(2)表面发生化学吸附(△q>0.2e),Ti_(2)CO_(2)(η_(NRR)=2.13 V)和Ti_(3)C_(2)O_(2)(η_(NRR)=2.03 V)催化剂由于过高的加氢过电位(η_(NRR))而不利于发生NRR;Ti_(2)C(OH)_(2)和Ti_(3)C_(2)(OH)_(2)表面可在起始步骤N_(2)吸附时提供H原子,并通过Enzymatic机制发生NRR,相应的ηNRR分别降至0.29,0.38 V;此外,η_(NRR)与功函数φ存在ηNRR=0.44φ−0.71函数关系,线性相关系数(R^(2))为0.97,两者存在较大的线性相关性;在^(*)OH终端与^(*)O终端表面N 2p轨道和O 2p轨道能级杂化强度不同,导致OH^(*)MXene的NRR活性不同。由此认为,N_(2)在Ti_(2)C(OH)_(2)和Ti_(3)C_(2)(OH)_(2)表面的N_(2)通过“N_(2)+2^(*)H=^(*)N_(2)H_(2)”进行吸附,然后沿Enzymatic机制进行NRR。

关键词：二维过渡金属碳氮化物氮气还原加氢第一性原理

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Comparative analysis of the intestinal tract microbiota and feeding habits of five sympatric flycatchers

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Avian Research 2022年第3期13卷 379-389页

作者： Zhehan Dong Shangmingyu Zhang yuwen cheng Xingcheng He Ian Haase Yi Liang Yong Jiang Yongjie Wu Key Laboratory of Bio-Resources and Eco-Environment Ministry of EducationCollege of Life ScienceSichuan UniversityChengdu610065China The General Work Station of Protected Area of Sichuan Province Sichuan Forestry and Grassland BureauChengdu610081China Administration of Gongga Mountain National Nature Reserve KangdingGanzi Tibetan Autonomous Prefecture626000China

Gut microbiota and host interactions co-evolve and develop into stably adapted microbial communities and play vital roles in maintaining the health of *** is supposed to be an important driver of differences in gut microbiota,but previous studies would commonly use literature depictions,which are essential but inaccurate,to explain the effects of diet on the gut microbiota of wild *** this study,we collected intestinal samples from five sympatric flycatchers to compare the gut microbial differences using bacterial 16S rRNA genes from Illumina MiSeq *** 1,642,482 quality-filtered sequences from 1816S rRNA libraries were obtained and distinct compositions and diversities of gut microbiota were found in five *** gut microbiota is mainly from the four bacterial phyla of Proteobacteria,Firmicutes,Actinomycetes,and Bacteroidetes,but at the genus level showed a significant *** predictions revealed that the metabolic capacity of the gut microbiota of five flycatchers is greatly distinguished at KEGG level *** multiple food fragments showed a significant correlation with gut ***,the significant differences in the specific composition of the diets of the five insectivorous flycatchers indicated the differentiation of dietary *** study of the gut microbiota and feeding habits of sympatric flycatchers would increase the understanding of the gut microbial diversity of wild birds,and also improve our cognition of the co-evolution and co-adaptation within the host gut microbiota relations.

关键词： Feeding habit Gastrointestinal tract Gut microbiota Insectivorous Muscicapidae Sympatric

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A high torque dual 3-phase permanent magnet vernier machine with strong fault-tolerance

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Science China Technological Sciences 2024年第10期67卷 3275-3284页

作者： XU yuwen WANG Bo WANG RongXin cheng Ming HUA Wei School of Electrical Engineering Southeast University

The field modulation effect has been proposed and investigated in various electric machine topologies. Among them, permanent magnet vernier machines(PMVMs) have attained intensive research due to the high torque density and simple ***, the performance of PMVMs in terms of fault tolerance is seldom mentioned. This article proposes a novel dual 3-phase fault-tolerant PMVM with segregated concentric windings. Benefiting from the field modulation effect, the PMVM can generate high torque with low PM flux. The low PM flux also implies small fault currents in the short-circuit case. Therefore, the PMVM exhibits inherent good fault-tolerant capability without sacrificing torque performance. Two independent 3-phase modular winding sets are adopted to improve redundancy. To realize the physical and electrical isolation, each winding set is controlled by a standard 3-phase inverter. The healthy performance and fault tolerance of the proposed machine are evaluated by finite element analysis and verified by experimental tests. The results infer its advantages in healthy conditions and various fault scenarios,including open-circuit, short-circuit, and interturn short-circuit conditions.

关键词： fault-tolerant capability segregated windings field modulation permanent magnet vernier machine

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Altitudinal migration behavior patterns of birds on the eastern slope of ***,China

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Avian Research 2023年第3期14卷 385-393页

作者： Ian Haase Zhengwei Liu Shangmingyu Zhang Zhehan Dong yuwen cheng Kaize Feng Kexin Peng Jianghong Ran Yongjie Wu Key Laboratory of Bio-Resources and Eco-Environment Ministry of EducationCollege of Life SciencesSichuan UniversityChengdu610065China

Many bird species in montane regions exhibit altitudinal migration behavior;however,altitudinal migration of birds is still understudied,especially in ***(7556 m) is the highest peak of the Hengduan Mountains in Southwest *** steep elevation gradient and the high bird diversity make the eastern slope of ***(Hailuo Valley) an ideal place for studying the altitudinal migration behavior patterns of *** synchronously recorded the local bird diversity,temperature and humidity at two sites(1800 and 3000 m a.s.l.) during three migration seasons from September 2020 to June 2021 to identify birds exhibiting altitudinal migration *** our surveys,we recorded 146 bird species in total and 20 passerine bird species were altitudinal migrants according to our altitudinal migration *** those 20 altitudinal migrant species,eight bird species displayed a typical altitudinal migration pattern(upward migration during the breeding season and downward migration during the non-breeding season).Moreover,temperature was correlated with the daily number of individuals(DNI) at each study ***,increasing temperatures possibly caused upward migration of birds(DNI decreased at 1800 m and increased at 3000 m) and vice *** further elaborate,the Rufousgorgeted Flycatcher(Ficedula strophiata),the species with the most prominent altitudinal migration behavior,initiated upward migration at a temperature of 11-12℃ at 1800 m and initiated downward migration at a temperature of 12-13℃ at 3000 ***,humidity was positively correlated with the ***,increasing humidity(equals to increasing rainfall or snow) possibly caused downward migration of birds(DNI increased) and vice ***,bird species exhibiting a typical altitudinal migration behavior pattern are feeding on ***,the spatial and temporal changes of the invertebrate biomass might be an important ecological driver for the altitudinal migration of invertiv

关键词： Altitudinal migration Birds Hengduan Mountains Humidity Invertebrate biomass Mt.Gongga Temperature

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Ecological traits affect the seasonal migration patterns of breeding birds along a subtropical altitudinal gradient

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Avian Research 2022年第4期13卷 429-436页

作者： yuwen cheng Zhixin Wen Xingcheng He Zhehan Dong Mingyu Zhangshang Dongrui Li Yan Wang Yong Jiang Yongjie Wu Key Laboratory of Bio-Resources and Eco-Environment Ministry of EducationCollege of Life ScienceSichuan UniversityChengdu610065China Key Laboratory of Zoological Systematics and Evolution Institute of ZoologyChinese Academy of SciencesBeijing100101China Administration of Gongga Mountain National Nature Reserve Ganzi Tibetan Autonomous PrefectureGanzi626000China

Altitudinal bird migration involves seasonal shifts up and down the altitude gradient *** as the place with the largest number of altitudinal migrants,has quite few related studies,especially for montane and temperate *** explore the potential drivers of seasonal altitudinal migration for birds in the middle of Hengduan Mountains,we conducted a three-year investigation on breeding and non-breeding season bird communities at eight elevational bands(1200–4200 m)in the Gongga *** examined the altitudinal migration patterns and relationships between seasonal distribution shifts and species'traits of 50 species with sufficient data recorded in both *** found that a large proportion of breeding birds underwent altitudinal migration and showed three migration patterns(downslope shift,upslope shift,no shift).Seasonal distribution shifts were mainly correlated with certain ecological *** breeding at high and mid-elevations,nesting in scrub and being omnivorous are more likely to show downslope movements during the non-breeding *** addition,territorially weaker species exhibited more diverse migration ***,we found the hand-wing index(HWI)was actually more convincing than body mass in explaining altitudinal *** results consolidate the studies of seasonal altitudinal migration in montane *** study could be used to bridge existing knowledge gaps that currently impeding effective conservation for montane avifaunas in the Hengduan Mountains.

关键词： Altitudinal migrant Breeding birds Functional traits Gongga mountain Migration patterns

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Linear shallow neural network to accelerate transmitter dispersion eye closure quaternary(TDECQ) assessment

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Science China(Information Sciences) 2024年第4期67卷 337-338页

作者： Junjiang XIANG Zejun CHEN Yijun cheng Hailin YANG Xuancheng HUO Meng XIANG Gai ZHOU yuwen QIN Songnian FU Institute of Advanced Photonics Technology School of Information EngineeringGuangdong University of Technology School of Optical and Electronic Information Huazhong University of Science and Technology Key Laboratory of Photonic Technology for Integrated Sensing and Communication Ministry of Education of ChinaGuangdong University of Technology Guangdong Provincial Key Laboratory of Information Photonics Technology Guangdong University of Technology

To support the ever-emerging capacity requirement of datacenter interconnection(DCI) applications, transmitter dispersion eye closure quaternary(TDECQ) has been proposed by IEEE802.3 standard [1], which is specifically employed for the four-level pulse amplitude modulation(PAM-4) signals. However, the traditional scheme of TDECQ assessment needs several iterative operations,

关键词： IEEE Standards

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硅胶印迹聚合物的制备及对钆离子吸附性能研究

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离子交换与吸附 2018年第1期34卷 19-28页

作者：程玉雯黎先财胡伟强南昌大学化学学院

选择聚乙烯亚胺为功能单体,利用3-氯丙基三乙氧基硅烷和戊二醛将Gd;交联包裹在硅胶表面接枝,制备硅胶印迹聚合物。通过红外光谱和热重分析研究印迹聚合物的结构性质,采用静态吸附实验对其吸附性能进行分析对比。实验结果表明,采用聚乙... 详细信息

选择聚乙烯亚胺为功能单体,利用3-氯丙基三乙氧基硅烷和戊二醛将Gd;交联包裹在硅胶表面接枝,制备硅胶印迹聚合物。通过红外光谱和热重分析研究印迹聚合物的结构性质,采用静态吸附实验对其吸附性能进行分析对比。实验结果表明,采用聚乙烯亚胺为功能单体制备的印迹聚合物对Gd;的最大吸附量可以达到82.72mg/g,通过对其进行热力学分析和动力学分析,得知基于硅胶表面制备的聚乙烯亚胺印迹聚合物对Gd;的吸附可以用Freundlich模型和准二级动力学模型描述,且粒子内扩散过程为其速控步骤。实验证明,该印迹聚合物对Gd;具有一定的选择性。

关键词：钆离子印迹聚合物聚乙烯亚胺选择性识别

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