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Ground-State Density Profiles of One-Dimensional Bose Gases with Anisotropic Transversal Confinement

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Chinese Physics Letters 2011年第7期28卷 59-61页

作者： hao ya-Jiang Department of Physics University of Science and Technology BeijingBeijing 100083

We investigate the ground-state density distributions of interacting one-dimensional Bose gases with anisotropic transversal *** the exact ground state energy density of homogeneous Bose gases with local density approximation,we determine the density distribution in each interacting regime for different anisotropic *** is shown that the transversal anisotropic parameter changes the density distribution obviously,and the observed density profiles on each orientation exhibit a difference of a factor.

关键词： parameters anisotropic gases

Changing structure of China's meat imports

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Journal of Integrative Agriculture 2015年第6期14卷 1081-1091页

作者： CHENG ya-hao Zhifeng Gao James Seale Jr. Department of Economics Nankai University Food and Resource Economics Department University of Florida

This paper discusses the determinants of meat imports of China. Results indicate that import demand is mostly determined by import price and real GDP. Imported price has a negative effect and real GDP has a positive influence on import quantity. Tariff does not have a significant effect. As GDP and consumption capacity increases, China has a large potential demand for meat imports. Some countries may gain if China＇s economy continues expanding, while others, like the United States, are the most sensitive to the trade policy of China.

关键词： imports Zealand expanding Australia income prices capita Fresh mostly accounting

Real-time label-free analysis of the thermostability of DNA structures using GelRed

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Nuclear Science and Techniques 2018年第10期29卷 148-154页

作者： ya-ya hao Lei Liu Lu-hao Zhang Qiu-Ling Huang Fei Wang Jiang Li Jia-Qiang Xu Li-Hua Wang NEST Lab Department of ChemistryCollege of ScienceShanghai UniversityShanghai 200444China Division of Physical Biology and Bioimaging Center CAS Key Laboratory of Interfacial Physics and TechnologyShanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 10049China

In biological systems, conformational transformations of nucleic acids play critical roles in genetic regulation. However, it remains a tricky task to design and optimize specific labeling strategies to track these *** this study, we exploited an intercalating fluorescent dye,GelRed, to characterize different DNA structures. We studied the correlation between fluorescence intensity and DNA structural properties. We showed that single-stranded DNAs with predicted self-folded secondary structures show much stronger fluorescence than those without such structures. For double-stranded DNAs, we observed that fluorescence intensity is positively correlated to their GCcontent. We also demonstrated that GelRed can be used to monitor DNA conformational changes upon temperature variations in real time. Based on these findings, we concluded that the fluorescence intensity of a GelRed-stained DNA structure has a good correlation with its thermostability in the form of a change in Gibbs free energy.

关键词： GelRed Secondary structure GC content Conformational transformation

Investigation of the decline of Ulva prolifera in the Subei Shoal and Qingdao based on physiological changes

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Journal of Oceanology and Limnology 2021年第3期39卷 918-927页

作者： ya hao Chen GUAN Xinyu Zhao Tongfei QU Xuexi TANG Ying WANG College of Marine Life Sciences Ocean University of ChinaQingdao 266100China Laboratory for Marine Ecology and Environmental Science Qingdao National Laboratory for Marine Science and TechnologyQingdao 266071China

It has been a scientific consensus that Ulva prolifera green tide that break out annually between May and August in the recent decade off eastern coast of Yellow *** investigate the ecological mechanism of the decline of *** green tide,we compared the physiological characteristics of *** samples collected in three stages of the green tide in Subei Shoal north Jiangsu,the initiation point,on May 10(early,the initiation),July 10(middle,the outbreak),and in Taipingjiao,Qingdao on August 10(late,the decline).Compared to the early samples,the middle,and late samples showed a lower chlorophyll content and photosynthetic e fficiency at a higher lipid peroxidation *** middle and later samples had fewer chloroplasts in the cells of *** than those in the early *** addition,the cells of *** sampled in the late stage showed ruptured and deformed cell *** in physiological function were reflected in the growth *** the middle and late *** samples presented negative growth *** analysis results show that the rising temperature was mainly responsible for the local decline of *** green *** high light-intensity that could induce the photoinhibition was also an important factor for the ***,*** population that remained in the Subei Shoal and those that northward drifted to Qingdao experienced the same decline processes:rising temperature and continuous high light conditions in the late phase of green tide reduced the photosynthetic capacity and destroyed the antioxidant system of the thallus,which lead to decrease of *** only difference is that the temperature in the Subei Shoal rose earlier than that in Qingdao;thus,*** remaining in the Subei Shoal went disappeared first.

关键词： Ulva prolifera green tide decline process photoinhibition lipid peroxidation

Preparation, Curing Reactivity and Thermal Properties of Titanium-doped Silicone Resins

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Chemical Research in Chinese Universities 2010年第5期26卷 851-856页

作者： WANG Xue-mei WU ya-hong hao Zhi-feng YU Jian YU Lin Faculty of Chemical Engineering and Light Industry Guangdong University of Technology Guangzhou 510006 P. R. China

Novel titanium-doped silicone resins were synthesized from low-cost silane monomers and tetrabutyl titanate as raw materials and hydrochloric acid as catalyst, with titanium element as dopant into principal chain of Si-O-Si. The resins were characterized by means of FTIR, IH NMR and 13C NMR spectra, their thermal properties and curing properties were investigated and their corresponding films were determined. The results show that the thermal stability and storage stability of the resins were influenced by the types of silane monomers containing dif- ferent carbon atomicities of organic group. The thermal stability of the titanium-doped silicone resin with a molar ratio of silane monomer B（n-propyl triethoxysilane） to silane monomer C（n-octyl triethoxysilane） being 1：1 is superior to that of the resin with a molar ratio of silane monomer B to silane monomer C being 1：3. However, the storage stability of the former is inferior to that of the latter. This work also showed that the synthesized titanium-doped silicone resins have the highest thermal stability up to 450--500℃ with an atomicity molar ratio of 1：4 of titanium to silicon in the reactants. But the best storage stability of the resin prepared from the reactants with an atomicity molar ratio of 1：6[n（Ti）：n（Si）] was obtained. The effect of the type and content of curing agent on the curing properties of the resin was also studied. Moreover, thermal mechanism and curing mechanism were proposed in this work.

关键词： Titanium-doped silicone resin Synthesis Thermal stability Curing Mechanism

Synthesis and Characterization of Picolinamide Calix[6]arenes Derivatives

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Chinese Chemical Letters 2006年第6期17卷 747-750页

作者： Dong Qing LIU ya Qing FENG hao Hui GU Wen Liang XU School of Chemical Engineering and Technology Tianjin University Tianjin 300072

Three full-substituted calix[6]arenes containing the picolinamide groups were synmesized and characterized by IR, ^1HNMR and MS, after series reactions, including lower rim etherification, upper rim ipso-nitration, re... 详细信息

关键词： Calixarene picolinamide synthesis characterization.

Primary squamous cell carcinoma of the liver:A case report

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World Journal of Clinical Cases 2022年第19期10卷 6744-6749页

作者： Li-Min Kang Di-Ping Yu Yong Zheng ya-hao Zhou Department of Hepatobiliary and Pancreatic Surgery Puer People's HospitalPuer 665000Yunnan ProvinceChina Department of Pathology Puer People's HospitalPuer 665000Yunnan ProvinceChina

BACKGROUND Squamous cell carcinoma(SCC)of the liver is rare,and is more commonly found in the skin,rectum,cervical or inguinal lymph *** SUMMARY A 73-year-old man had been experiencing right upper quadrant discomfort for some *** had a 50-year history of smoking and *** average,he smoked 20 cigarettes and consumed 200 *** didn’t have a history of hepatitis or ***,vomiting,jaundice,dysuria,chills,and abdominal distention were not observed at the time of *** in the right upper quadrant was found on physical examination,but there was no palpable abdominal *** obvious abnormalities in laboratory tests and tumor markers were *** plasma retention rate of indocyanine green(ICG)at 15 min was 1.35%.Subsequent abdominal ultrasonography showed a mixed echoic mass approximately 3.8 cm diameter in the left caudate lobe of the *** computed tomography confirmed a 3.0 cm×3.5 cm irregular mass with inhomogeneous density and moderate delayed enhancement in the left caudate lobe of the *** left caudate lobectomy was performed to remove the liver ***-operative findings confirmed a non-cirrhotic liver,with a 3 cm×3.5 cm white tumor mass in the left caudate lobe with no tumor rupture and no *** resection margin was 1.0 cm in *** We describe the first case of SCC in the left caudate lobe of the liver,which was successfully treated by surgical resection and postoperative *** tumor recurrence was observed during the 8-mo follow-up.

关键词： Squamous cell carcinoma Liver Left caudate lobe Immunotherapy Case report

Electronic Structure and Optical-absorption Properties of C-, N-, and S-doped BiOCl: the First-principles Calculations

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Chinese Journal of Structural Chemistry 2019年第4期38卷 509-523页

作者： yaO Wen-Zhi yaO Jian-Bin ZHANG Xia MA ya-hao Department of Environmental and Municipal Engineering North China University of Water Resources and Electric Power Institute for Computational Materials Science School of Physics and Electronics Henan University Department of Information Engineering North China University of Water Resources and Electric Power

Impurity formation energy, electronic structure, and photocatalytic properties of C-, N-, or S-doped BiOCl are investigated by density-functional theory plus U calculations(DFT + U). Results show that the doping effect of S is better than that of C or N on the tunable photocatalytic activities of BiOCl. At low concentration, S-doped BiOCl systems are the most stable under Bi-rich growth conditions because of their lower impurity-formation energy. Compared with the electronic structures of S-doped BiOCl, C-or N-doped BiOCl have relatively deeper impurity energy levels appearing in their band gap(except Bi_(36)O_(35)NCl_(36)), which may act as photogenerated carrier-recombination centers and reduce photocatalytic activity. At high concentration, S is substituted on the O lattice site system, whereas some S 3p states mix with the valence band; this mixture leads to an obvious band-gap decrease and continuum-state formation above the valence-band edge of BiOCl. Such activity is advantageous to photochemical catalysis response. Compared with pure Bi OCl and a low-concentration S-doped system, a high-concentration S-doped system shows an obvious redshift on the absorption edge and has better photocatalytic O_2 evolution performance.

关键词： BiOCl C N S doping the first-principles electronic structures visible light absorption

Deciphering dynamic surface of PtRu alloy nanocatalysts to revisit their synergistic effects during the electrooxidation

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Science China Chemistry 2024年第7期67卷 2224-2233页

作者： Xiao-Chong Li Bo Wang Zhou Yu Qiang Wan Ju-Fang Zheng Emmanuel Maisonhaute Xiao-Shun Zhou ya-hao Wang Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Institute of Physical ChemistryZhejiang Normal UniversityJinhua 321004China Laboratoire Interface et Systèmes Electrochimiques CNRS UMR 8235Sorbonne UniversitéF-75252 Paris cedex 5France

Correlating dynamic structural transformation of catalysts with the surface intermediate species under operating conditions is critical for updating the understanding of structure–performance ***,we probe the electrochemical potentialdependent surface structures and adsorbed intermediates on PtRu binary alloy nanocatalysts to revisit its synergistic mechanisms for CO electrooxidation enhanced ***-situ spectral characteristics by using modified shell-isolated nanoparticle-enhanced Raman spectroscopy,show that in acidic solution,when the potential is positively scanned from 0.1 V to 1.5 V relative to reversible hydrogen electrode(RHE),the surface of the alloy catalyst evolves from metallic PtRu to adsorbed oxygen gradually covering and accumulating on Ru sites(denoted as PtRuO_(x),x≤2),forming segregated RuO_(2),and finally forming a threedimensional oxide layer(denoted as 3D PtRuO_(4)).Moreover,molecular evidence associated with periodic density functional theory calculations reveals that electronic effects promote ruthenium to become more oxidizable and *** particular,we found here that ^(*)O and ^(*)OH at surface RuO_(x) sites are highly efficient CO oxidation active species in comparison to the same entities adsorbed on metallic Ru *** work sheds light on the complex surface dynamic process of practical Pt-based binary nanocatalysts and improves the understanding of synergistic mechanism for the development of fuel cell devices.

关键词： in-situ Raman spectroscopy surface evolution bifunctional mechanism PtRu electrooxidation

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