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Nonlinear electronic and ultrafast optical signatures in chemical vapor-deposited ultrathin PtS_(2) ribbons

Nano Research 2022年第5期15卷 4366-4373页

作者： Shaolong jiang Jin Yang Liang Zhu Jiafeng Xie Weiteng Guo Erding Zhao Chaoyu Chen Tianwu Wang Fuhai Su Yanfeng Zhang Junhao Lin Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices and Department of Physics Southern University of Science and TechnologyShenzhen 518055China Key Laboratory of Materials Physics Institute of Solid State PhysicsHFIPSChinese Academy of SciencesHefei 230031China University of Science and Technology of China Hefei 230026China Great Bay Area Research Institute Aerospace Information Research Institute(AIR)of Chinese Academy of Science(CAS)Guangzhou 510700China Shenzhen Institute for Quantum Science and Engineering and Department of Physics Southern University of Science and TechnologyShenzhen 518055China International Quantum Academy and Shenzhen BranchHefei National LaboratoryFutian DistrictShenzhen 518048China School of Materials Science and Engineering Peking UniversityBeijing 100871China

The emerging two-dimensional(2D)platinum disulfide(PtS_(2))has driven increasing attentions due to its high electron mobility,good air-stability,and strong interlayer interaction which leads to a widely tunable electronic structure.However,a detailed study on its covalent-like layer-dependent properties remains infant.Herein,we demonstrate the successful production of ultrathin 1T-PtS_(2) ribbons with thickness centralized almost at monolayer 1L-4L and large domain size up to 210 μm on Au foils using chemical vapor deposition(CVD)technique,which enables macro-and microscopic study of its extraordinary layer-dependent features with precise control of the number of layers.Using electron energy loss spectroscopy(EELS)and optical pump-probe spectroscopy(OPPS),we reveal that both the electron and ultrafast optical absorption signals of the as-grown 2D PtS_(2) show strong nonlinear layer-dependent responses which manifest discriminated transition in 1L-4L PtS_(2) ribbons.The layer-dependent nonlinear response of 2D PtS_(2) can be well interpreted in the frame of calculated electron and phonon structures.These achievements offer a platform for successfully fabricating large-sized ultrathin 2D PtS_(2) and facilitating our knowledge about its electronic and optoelectronic properties.

关键词： platinum disulfide(PtS_(2)) chemical vapor deposition electronic transition saturable absorption optical pump-probe spectroscopy

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Salt-assisted growth and ultrafast photocarrier dynamics of large-sized monolayer ReSe2

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Nano Research 2020年第3期13卷 667-675页

作者： Shaolong jiang Jin Yang Yuping Shi Jing Zhao Chunyu Xie Liyun Zhao Jiatian Fu Pengfei Yang Yahuan Huan Qin Xie Huachao jiang Qing Zhang Xianlong Wang Fuhai Su Yanfeng Zhang Department of Materials Science and Engineering College of EngineeringPeking UniversityBeijing100871China Key Laboratory of Materials Physics Institute of Solid State PhysicsChinese Academy of SciencesHefei230031China University of Science and Technology of China Hefei230026China Center for Nanochemistry(CNC) Beijing National Laboratory for Molecular SciencesCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing100871China

Owing to its anisotropic optical and electrical properties,rhenium diselenide(ReSe2)has garnered considerable attention recently as a candidate material for polarization-sensitive photodetectors.However,the direct and controllable synthesis of large-sized ReSe2 with a uniform thickness is still a great challenge.Herein,we have refined the synthesis method to obtain uniform monolayer ReSe2 flakes with a size of up to^106μm on sapphire via an ambient-pressure chemical vapor deposition technique using Na promoter from sodium chloride.Interestingly,optical pump-probe spectroscopy revealed a fast switching from saturable absorption(SA)to absorption enhancement(AE)in subpicosecond time scale,followed by a slower decay induced by exciton recombination.Furthermore,both AE and SA signals exhibited clear angular dependence with a periodicity of 180°,which reflected the dichroism in nonlinear absorption dynamics.In addition,the photocarrier dynamics including free-carrier transport and subpicosecond relaxation due to exciton formation or surface trapping was probed using time resolved terahertz spectroscopy.We believe that our study serves as a reference for atomically controlled synthesis of large-sized ReSe2 and provides useful insights on its optoelectronic properties for novel device applications.

关键词： ReSe2 chemical vapor deposition sodium chloride large size ultrafast photocarrier dynamics

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Influence of liquid water content on wind turbine blade icing by numerical simulation

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排灌机械工程学报 2019年第6期37卷 513-520页

作者： LI Yan SUN Ce jiang Yu YI Xian GUO Wenfeng WANG shaolong FENG Fang Heilongjiang Provincial Key Laboratory of Technology and Equipment for Utilization of Agricultural Renewable Resources in Cold Region Northeast Agricultural University Harbin Heilongjiang 150030 China State Key Laboratory of Aerodynamics China Aerodynamics Research and Development Center Mianyang Sichuang 621000 China College of Metallurgy & Energy North China University of Science and Technology Tangshan Hebei 063009 China

In order to research the influence of liquid water content ( LWC ) on blade icing of wind turbine, a numerical simulation method for blade icing was established. The numerical simulation was based on low speed viscous N-S equation. The trajectory equation of water droplets was established by Lagrangian method. The mass and energy conservation equations of the water droplets impacting on the surface of the blade were solved based on control body theory. Three sections along blade span wise of a 1.5 MW wind turbine were decided to simulate icing. Five kinds of LWC were selected for simulation including 0.2,0.4,0.6,0.8 and 1.0 g/m^3 under two ambient temperatures of -10 ℃ and -20 ℃. The medium volume droplet diameter ( MVD ) was 30μm. The simulations included icing shape on blade surface, dimensionless icing area and dimensionless maximum stagnation thickness. Furthermore, the flow fields around both the iced blade airfoil and the original one were simulated and analyzed. Accor-ding to the results, the typical icing characteristics of icing shape, icing area and thickness were greatly affected by the difference of LWCs. This study can provide theoretical reference for the research on antiicing and deicing of wind turbine blade.

关键词： wind turbine icing airfoil numerical simulation liquid water content

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Transcriptome analysis of purple pigment formation in Colocasia esculenta

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BIOCELL 2021年第3期45卷 785-796页

作者： FANGLIAN HE WEIQING DONG shaolong WEI ZUYANG QIU JINGLI HUANG HUIPING jiang SHIYU HUANG LILI LIU Biotechnology Research Institute Guangxi Zhuang Nationality Autonomous Region Academy of Agricultural SciencesNanning530007China Guangxi Zhuang Nationality Autonomous Region Academy of Agricultural Sciences Nanning530007China Lipu Municipal Bureau of Agriculture and Rural Affairs Lipu546600China College of Agriculture Guangxi UniversityNanning530004China

Taro(Colocasia esculenta(L.)Schott)is an important crop in Africa,Southeast Asia,and subtropics and is used as a food and medicine.The purple color pigmentation is an appealing character in taro.We sampled taro corms of the cultivar‘Lipu Taro’at four developmental stages,including LPYS1(without purple pigment,50 days of development(DOD)),LPYS2(very few purple pigments,75 DOD),LPYS3(moderate purple pigments,115 DOD)and LPYS4(high purple pigments,205 DOD).The purpose of our study was to identify the key genes underpinning the purple pigmentation in taro based on RNA-sequencing.Through RNA-Seq,6453 differentially expressed transcripts(DETs)were identified between purple and non-purple pigmented samples.We identified 41 and 12 flavonoid and anthocyanin related DETs transcripts,respectively.These DETs were upregulated at LPYS2,LPYS3,and LPYS4 as compared to LPYS1,indicating their positive contribution to the color formation in taro.Moreover,we identified several DETs encoding for transcription factors,including MYB and bHLH,known to be major regulators of structural genes involved in the flavonoid-anthocyanin pathway.Finally,we reported several plant hormones(ethylene,auxin,gibberellin,jasmonic acid,and cytokinin)related DETs,which are predicted to play important roles in the corm coloration.Different regulation of transcripts representing the flavonoid-anthocyanin biosynthesis pathway,plant hormone transduction pathway,and transcription factors may have key roles in purple pigmentation in taro.Our findings will facilitate future research on improving the quality and appeal of taro.

关键词： Anthocyanin Colocasia esculenta Color formation Plant hormones Gene expression Transcription factors

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Scalable salt-templated directed synthesis of high-quality MoS_(2) nanosheets powders towards energetic and environmental applications

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Nano Research 2020年第11期13卷 3098-3104页

作者： Lijie Zhu Pengfei Yang Yahuan Huan Shuangyuan Pan Zhaoqian Zhang Fangfang Cui Yuping Shi Shaolong jiang Chunyu Xie Min Hong Jiatian Fu Jingyi Hu Yanfeng Zhang Department of Materials Science and Engineering College of EngineeringPeking UniversityBeijing100871China

Two-dimensional(2D)transition metal dichalcogenides(TMDCs)have emerged as perfect platforms for developing applications in nano-electronics,catalysis,energy storage and environmental-related fields due to their superior properties.However,the low-cost,batch production of high-quality 2D TMDCs remains a huge challenge with the existing synthetic strategies.Herein,we present a scalable chemical vapor deposition(CVD)approach for the batch production of high-quality MoS_(2) nanosheet powders,by using naturally abundant,water-soluble and recyclable NaCl crystal powders as templates.The high-quality MoS_(2) nanosheets powders are achieved by a facile water dissolution-filtration process,by virtue of the excellent dispersibility of the as-grown products in water.The internal mechanism for the scalable synthesis strategy is explored.The applications of the MoS_(2) nanosheets powders are also demonstrated as catalysts or adsorbents in hydrogen evolution reaction(HER)and organic dyes adsorption,respectively.This work should hereby pave ways for the mass production and application of powdery TMDCs in energetic and environmental related fields.

关键词： mass production salt-templated molybdenum disulfide chemical vapor deposition green transfer

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鸡传染性滑膜炎诊断与防治

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畜牧兽医科学（电子版） 2022年第3期 71-72页

作者：江少龙河北省邯郸市涉县农业农村局河北邯郸056400

鸡传染性滑膜炎是一种危害蛋鸡关节的传染性疾病,又称为滑液囊支原体病,具有极强的传染能力,在养殖群体中一旦传播流行,如果没有做好有效的封锁隔离和妥善有效的治疗,短时间内就会造成大面积的传染,甚至会危及鸡的正常生长,带来严重的... 详细信息

鸡传染性滑膜炎是一种危害蛋鸡关节的传染性疾病,又称为滑液囊支原体病,具有极强的传染能力,在养殖群体中一旦传播流行,如果没有做好有效的封锁隔离和妥善有效的治疗,短时间内就会造成大面积的传染,甚至会危及鸡的正常生长,带来严重的经济损失。该种疾病造成的威胁较为严重,需要养殖管理人员提高重视程度,加强对疾病的有效防范,确保在短时间内能够控制病情。该文探讨了鸡传染性滑膜炎的流行特征、临床症状、病理解剖,并提出了防治措施,希望对更好地防范该类疾病有一定作用。

关键词：鸡传染性滑膜炎诊断防治措施

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牛胃肠炎病因及防治措施

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畜牧兽医科学（电子版） 2022年第2期 76-77页

作者：江少龙河北省邯郸市涉县农业农村局河北邯郸056400

胃肠炎是牛养殖期间流行率较高的一类疾病的总称。牛胃肠炎发病原因复杂,饲养管理不科学、饲草质量不达标等,均可造成牛严重营养不良,身体抵抗力下降,继而病原微生物趁机入侵。由于牛胃肠炎的发病原因多种多样,在临床诊治中,要有效鉴别... 详细信息

胃肠炎是牛养殖期间流行率较高的一类疾病的总称。牛胃肠炎发病原因复杂,饲养管理不科学、饲草质量不达标等,均可造成牛严重营养不良,身体抵抗力下降,继而病原微生物趁机入侵。由于牛胃肠炎的发病原因多种多样,在临床诊治中,要有效鉴别具体原因,并在此基础上建立合理的管理方案,确保短时间内控制病情。该文探讨了牛胃肠炎的发病原因和防治措施,希望对广大同行有所帮助。

关键词：牛胃肠炎发病原因防治措施

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Stable and realistic crack pattern generation using a cracking node method

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Frontiers of Computer Science 2018年第4期12卷 777-797页

作者： Juan ZHANG Fuqing DUAN Mingquan ZHOU Dongcan jiang Xuesong WANG Zhongke WU Youliang HUANG Guoguang DU shaolong LIU Pengbo ZHOU Xiangang SHANG College of Computer Science and Technology Beijing Normal University Beijing 100875 China College of Art and Communication Beijing Normal University Beijing 100875 China School of Electronics Engineering and Computer Science Peking University Beijing 100871 China

This paper presents a method for simulating surface crack patterns appearing in ceramic glaze, glass, wood and mud. It uses a physically and heuristically combined method to model this type of crack pattern. A stress field is defined heuristically over the triangle mesh of an object. Then, a first-order quasi-static cracking node method （CNM） is used to model deformation. A novel combined stress and energy combined crack criterion is employed to address crack initiation and propagation separately according to physics. Meanwhile, a highest-stress-first rule is applied in crack initiation, and a breadth-first rule is applied in crack propagation. Finally, a local stress relaxation step is employed to evolve the stress field and avoid shattering artifacts. Other related issues are also discussed, such as the elimination of quadra- ture sub-cells, the prevention of parallel cracks and spurious crack procession. Using this method, a variety of crack patterns observed in the real world can be reproduced by changing a set of parameters. Consequently, our method is robust because the computational mesh is independent of dynamic cracks and has no sliver elements. We evaluate the realism of our results by comparing them with photographs of realworld examples. Further, we demonstrate the controllability of our method by varying different parameters.

关键词： crack pattern generation fracture simulation physically-based extend finite element method crack nodemethod

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Application of chemical vapor-deposited monolayer ReSe2 in the electrocatalytic hydrogen evolution reaction

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Nano Research 2018年第4期11卷 1787-1797页

作者： Shaolong jiang Zhepeng Zhang Na Zhang Yahuan Huan Yue Gong Mengxing Sun Jianping Shi Chunyu Xie Pengfei Yang Qiyi Fang He Li Lianming Tong Dan Xie Lin Gu Porun Liu Yanfeng Zhang Department of Materials Science and Engineering College of Engineering Peking University Beijing 100871 China Center for Nanochemistry (CNC) Beijing National Laboratory for Molecular Sciences College of Chemistry and Molecular Engineering Peking University Beijing 100871 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China School of Physical Sciences University of Chinese Academy of Sciences Beijing 100190 China Institute of Microelectronics Tsinghua National Laboratory for Information Science and Technology (TNList) Tsinghua University Beijing 100084 China Collaborative Innovation Center of Quantum Matter Beijing 100190 China Centre for Clean Environment and Energy Griffith University Gold Coast 4222 Australia

Controlled synthesis of structurally anisotropic rhenium diselenide （ReSe2） with macroscopically uniform and strictly monolayer thickness as well as tunable domain shape/size is of great interest for electronics-, optoelectronics-, and electrocatalysis-related applications. Herein, we describe the controlled synthesis of uniform monolayer ReSe2 flakes with variable morphology （sunflower- or truncated-triangle-shaped） on SiO2/Si substrates using different ambient-pressure chemical vapor deposition （CVD） setups. The prepared polycrystalline ReSe2 flakes were transferred intact onto Au foil electrodes and tested for activity in the hydrogen evolution reaction （HER）. Interestingly, compared to the compact truncated-triangle-shaped ReSe2 flakes, their edge-abundant sunflower-shaped counterparts exhibited superior electrocatalytic HER activity, featuring a relatively low Tafel slope of - 76 mV/dec and an exchange current density of 10.5 μA/cm2. Thus, our work demonstrates that CVD-grown ReSe2 is a promising two- dimensional anisotropic material for applications in the electrocatalytic HER.

关键词： rhenium diselenide,chemical vapor deposition（CVD）,monolayer,morphology control,hydrogen evolution reaction （HER）

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农村劳动力转移与乡镇负债破解

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当代经济研究 2006年第3期 52-56页

作者：蒋少龙西南财经大学四川成都610074

经济学家为我国“三农”问题政策的制定起了关键性作用。我国的“三农”问题具有长期性,要通过调整农业结构和农村经济结构,逐步解决农业、农民这一弱质产业和弱质群体的生存和发展问题。要从根本上解决农民进城的体制障碍,化解乡镇债务... 详细信息

经济学家为我国“三农”问题政策的制定起了关键性作用。我国的“三农”问题具有长期性,要通过调整农业结构和农村经济结构,逐步解决农业、农民这一弱质产业和弱质群体的生存和发展问题。要从根本上解决农民进城的体制障碍,化解乡镇债务,中央政府和地方政府(省级财政)应当埋单。

关键词：三农问题非农产业化劳动力转移农民进城乡镇负债

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