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Intraspecific Polymorphism of Rice Frog,Fejervarya multistriata(Anura: Ranidae),in Lingnan,Huangshan,China 被引量:2
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作者 Diancheng YANG Lifang PENG +1 位作者 jingcheng xu Song HUANG 《Asian Herpetological Research》 SCIE CSCD 2017年第1期22-26,共5页
Many anuran species exhibit striking color and/or pattern polymorphisms. We sampled 599 adult rice frogs, Fejervarya multistriata, from a rice paddy in the periphery of the Lingnan Nature Reserve (Huangshan, Anhui).... Many anuran species exhibit striking color and/or pattern polymorphisms. We sampled 599 adult rice frogs, Fejervarya multistriata, from a rice paddy in the periphery of the Lingnan Nature Reserve (Huangshan, Anhui). We recognized ten morphs based on three relatively stable and distinct morphological characters: dorsal ground color (green or gray), middorsal stripe (absence, wide, or narrow), occipital rusty spot (absence or presence). The grey individuals are more common and larger than the green individuals (frequency 88.1 vs. 11.9%, respectively) and (SVL 39.4-36.6 vs. 35.7-34.6 mm, respectively). There is a higher proportion of individuals with a middorsal stripe (59.7%) while absence of the occipital rusty spot is more common in the population (82.3%). We expect additional studies in different habitat types would help build our understanding of the relationship between color polymorphism and habitat, geography, and climate. 展开更多
关键词 dorsal ground color middorsal stripe occipital rusty spot frequency body size
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Coordination environments build up and tune a superior synergistic “genome” toward novel trifunctional (TM-N_(x)O_(4−x))@g- C_(16)N_(3)-H_(3): High-throughput inspection of ultra-high activity for water splitting and oxygen reduction reactions 被引量:1
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作者 Chunyao Fang Xian Wang +4 位作者 Qiang Zhang Xihang Zhang Chenglong Shi jingcheng xu Mengyu Yang 《Nano Research》 SCIE EI CSCD 2024年第4期2337-2351,共15页
Emerging as a prominent area of focus in energy conversion and storage technologies,the development of highly active metal-based single-atom catalysts(SACs)holds great significance in searching alternatives to replace ... Emerging as a prominent area of focus in energy conversion and storage technologies,the development of highly active metal-based single-atom catalysts(SACs)holds great significance in searching alternatives to replace precious metals toward the efficient,stable,and low-cost hydrogen evolution reaction(HER),as well as the oxygen evolution reaction(OER)and the oxygen reduction reaction(ORR).Combining the tremendous tunability of ligand and coordination environment with rich metal-based electrocatalysts can create breakthrough opportunities for achieving both high stability and activity.Herein,we propose a novel and stable holey graphene-like carbon nitride monolayer g-C_(16)N5(N_(4)@g-C_(16)N_(3))stoichiometries interestingly behaving as a natural substrate for constructing SACs((TM-N_(4))@g-C_(16)N_(3)),whose evenly distributed holes map rich and uniform nitrogen coordination positions with electron-rich lone pairs for anchoring transition metal(TM)atoms.Then,we employed density functional theory(DFT)calculations to systematically investigate the electrocatalytic activity of(TM-N_(4))@g-C_(16)N_(3) toward HER/OER/ORR,meanwhile considering the synergistic modulation of H-loading and O-coordination((TM-N_(x)O_(4-x))@g-C_(16)N_(3)^(-)H_(3),x=0–4).Together a“four-step procedure”screening mechanism with the first-principles high-throughput calculations,we find that(Rh-N_(4))and(Ir-N_(2)O_(2)-II)distributed on g-C_(16)N_(3)^(-)H_(3) can modulate the adsorption strength of the adsorbates,thus achieving the best HER/OER/ORR performance among 216 candidates,and the lowest overpotential of 0.098/0.3/0.46 V and 0.06/0.48/0.45 V,respectively.Additionally,the d-band center,crystal orbital Hamilton population(COHP),and molecular orbitals are used to reveal the OER/ORR activity source.Particularly,the Rh/Ir-d orbital is dramatically hybridized with the O-p orbital of the oxygenated adsorbates,so that the lone-electrons incipiently locate at the antibonding orbital pair up and populate the downward bonding orbital,allowing oxygenated intermediates to be adsorbed onto(TM-N_(x)O_(4-x))@g-C_(16)N_(3)^(-)H_(3) appropriately. 展开更多
关键词 single atom catalysts loading and coordination hydrogen evolution reaction oxygen evolution reaction oxygen reduction reaction
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光化学条件下(β-重氮-α,α-二氟乙基)膦酸酯与羧酸的酯化反应 被引量:1
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作者 刘江 徐敬成 +3 位作者 Romana Pajkert 梅海波 Gerd-Volker Röschenthaler 韩建林 《化学学报》 SCIE CAS CSCD 北大核心 2021年第6期747-750,共4页
利用可见光促进的O-H插入反应可以在温和条件下实现羧酸与原位生成的(β-重氮-α,α-二氟乙基)膦酸酯的酯化反应,以良好的产率得到了含有α,α-二氟甲基膦酸酯的羧酸酯类化合物.该反应操作简单,对于不同的官能团具有良好的适应性.因此,... 利用可见光促进的O-H插入反应可以在温和条件下实现羧酸与原位生成的(β-重氮-α,α-二氟乙基)膦酸酯的酯化反应,以良好的产率得到了含有α,α-二氟甲基膦酸酯的羧酸酯类化合物.该反应操作简单,对于不同的官能团具有良好的适应性.因此,这一反应为α,α-二氟甲基膦酸酯衍生物的合成提供了一种高效的策略. 展开更多
关键词 二氟重氮乙烷 (β-重氮-α α-二氟乙基)膦酸酯 可见光促进 O-H插入 掩蔽的卡宾
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Highly sensitive acetone gas sensor based on ultra-low content bimetallic PtCu modified WO3·H2O hollow sphere
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作者 Lifeng Deng Liping Bao +2 位作者 jingcheng xu DingWang Xianying Wang 《Chinese Chemical Letters》 SCIE CAS CSCD 2020年第8期2041-2044,共4页
Acetone is an important industrial raw material as well as biomarker in medical diagnosis.The detection of acetone has great significance for safety and health.However,high selectivity and low concentration(ppb level)... Acetone is an important industrial raw material as well as biomarker in medical diagnosis.The detection of acetone has great significance for safety and health.However,high selectivity and low concentration(ppb level)detection remain challenges for semiconductor gas sensor.Herein,we present a novel sensitive material with bimetallic PtCu nanocrystal modified on WO3·H2O hollow spheres(HS),which shows high sensitivity,excellent selectivity,fast response/recovery speed and low limit of detection(LOD)to acetone detection.Noteworthy,the response(Ra/Rg)of WO3·H2O HS sensor increased by 9.5 times after modification with 0.02%bimetallic PtCu nanocrystals.The response of PtCu/WO3·H2O HS to 50 ppm acetone is as high as 204.9 with short response/recovery times(3.4 s/7.5 s).Finally,the gassensitivity mechanism was discussed based on gas sensitivity test results.This research will offer a new route for high efficient acetone detection. 展开更多
关键词 Bimetallic nanocrystal WO3·H2O hollow spheres Two-dimensional materials Acetone gas sensors NANOCOMPOSITES
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