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Influence of English Proficiency on Postgraduate Students＇ Use of Language Learning Strategies

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Sino-US English Teaching 2011年第12期8卷 766-772页

作者： ouYANG ou-chun Jiangxi University of Science and Technology （Nanchang Campus） Nanchang China

This study investigated the use of language learning strategies by a group of postgraduate students in a Chinese university. The emphasis was on the influence of L2 （second language） proficiency on learners＇ strategy use, aiming to look at how proficiency affects the use of LLS （language learning strategies） among postgraduate students learning EFL （English as a foreign language）, and to reveal some distinctive features in postgraduate students＇ use of learning strategies. Findings from this study have suggested a number of implications for the classroom teaching. Teachers should recognize that some strategies might be more suited to some learners than to others due to individual differences. Learners needed further training in the use of all learning strategies

关键词： LLS (language learning strategies) postgraduate students English proficiency

Assessment of the Genetic Relationship and Diversity of Mango and Its Relatives by cpISSR Marker

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Agricultural Sciences in China 2007年第2期6卷 137-142页

作者： HE Xin-hua guo Yong-ze LI Yang-rui ou Shi-jin Guangxi Crop Genetic Improvement and Biotechnology Laboratory Guangxi Academy of Agricultural Sciences Nanning 530007 P.R. China College of Agriculture Guangxi University Nanning 530004 P.R.China

Chloroplast inter-simple sequence repeat markers in mango were developed and used to analyze the genetic relationship and diversity of mango and its relatives. Thirty-six mango cultivars （Mangifera indica L.） and its relative species collected from the fruit germplasm collection in the Guangxi Academy of Agricultural Sciences, China, were examined by ISSR-PCR with chloroplast DNA （cpDNA）. Eight better primers for chloroplast DNA that provided reproducible, polymorphic DNA amplification patterns were screened from 50 ISSR primers and used for UPGMA analysis. According to the band patterns with 8 primers for chloroplast DNA, all cultivars tested were distinguished from each other and these showed ample genetic diversity; the average percentage of polymorphism was 77.2%. The 36 samples could be clustered into four groups by UPGMA analysis at the coefficient 0.74. The results indicated that the cplSSR marker was a new powerful tool for the identification of mango cultivars or its relative species, and their genetic relationship analysis and diversity evaluation.

关键词： Mangifera indica ISSR cpDNA genetic relationship genetic diversity

Hyperbolicity of elliptic Lagrangian orbits in the planar three body problem

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Science China Mathematics 2014年第7期57卷 1539-1544页

作者： ou YuWei Department of Mathematics Shandong University

The linear stability of Lagrangian elliptic equilateral triangle homographic solutions in the classical planar three body problem depends on the mass parameter β = 27（m1m2 ＋ m2m3 ＋ m3m1）/（m1 ＋ m2 ＋ m3）2∈ [0,9] and the eccentricity e ∈ [0,1）.In this paper we use Maslov-type index to study the stability of these solutions and prove that the elliptic Lagrangian solutions is hyperbolic for β ＆gt; 8 with any eccentricity.

关键词： planar three-body problem Lagrangian solution hyperbolicity Maslov-type index

PDK1 promotes breast cancer progression by enhancing the stability and transcriptional activity of HIF-1α

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Genes & Diseases 2024年第4期11卷 353-367页

作者： Yu Wei Dian Zhang He Shi Husun Qian Hongling Chen Qian Zeng Fangfang Jin Yan Ye Zuli ou Minkang guo Bianqin guo Tingmei Chen Key Laboratory of Clinical Laboratory Diagnostics(Ministry of Education) College of Laboratory MedicineChongqing Medical UniversityChongqing 400016China Chongqing Key Laboratory of Translational Research for Cancer Metastasis and Individualized Treatment Chongqing University Cancer HospitalChongqing 400030China

Pyruvate dehydrogenase kinase 1(PDK1)phosphorylates the pyruvate dehydroge-nase complex,which inhibits its *** pyruvate dehydrogenase complex inhibits the tricarboxylic acid cycle and the reprogramming of tumor cell metabolism to glycolysis,which plays an important role in tumor *** study aims to elucidate how PDK1 pro-motes breast cancer *** found that PDK1 was highly expressed in breast cancer tissues,and PDK1 knockdown reduced the proliferation,migration,and tumorigenicity of breast cancer cells and inhibited the HIF-1α(hypoxia-inducible factor 1α)*** investigation showed that PDK1 promoted the protein stability of HIF-1αby reducing the level of ubiquitination of HIF-1α.The HIF-1αprotein levels were dependent on PDK1 kinase ***,HIF-1αphosphorylation at serine 451 was detected in wild-type breast cancer cells but not in PDK1 knockout breast cancer *** phosphorylation of HIF-1αat Ser 451 stabilized its protein levels by inhibiting the interaction of HIF-1αwith von Hippel-Lindau and prolyl hydroxylase *** also found that PDK1 enhanced HIF-1αtranscriptional *** summary,PDK1 enhances HIF-1αprotein stability by phosphorylating HIF-1αat Ser451 and promotes HIF-1αtranscriptional activity by enhancing the binding of HIF-1αto ***1 and HIF-1αform a positive feedback loop to promote breast cancer progression.

关键词： Breast cancer HIF-1α PDK1 Protein phosphorylation Transcriptional activity

Long-range asymmetric Cherenkov radiation

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Science China(Physics,Mechanics & Astronomy) 2024年第4期67卷 170-171页

作者： Gang Zhong Qingdong ou Macao Institute of Materials Science and Engineering(MIMSE) Faculty of Innovation EngineeringMacao University of Science and TechnologyTaipaMacao 999078China

Cherenkov radiation(CR)is gaining increasing attention as a high-output power Terahertz radiation source,and it plays a significant role in particle detectors,accelerators,and space science[1].This captivating phenomenon was first observed by Cerenkov in 1934 and was later explained theoretically by Tamm and Frank in 1937,earning them the Nobel Prize in Physics in *** occurs when charged particles move faster than the phase velocity of light in a specific medium.

关键词： asymmetric faster explained

The Physiological and Molecular Responses of Arabidopsis thaliana to the Stress of Oxalic Acid

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Agricultural Sciences in China 2009年第7期8卷 828-834页

作者： CHEN Xiao-ting LIN Jie SHAO Xue-feng ou Xiao-ming WANG Zong-hua LU guo-dong College of Life Sciences Fujian Agriculture and Forestry University Fuzhou 350002 P.R.China Key Laboratory of Bio-Pesticide and Chemistry Biology Ministry of Education Fuzhou 350002 P.R.China

Many fungal phytopathogens can secrete oxalic acid （OA）, which is the crucial pathogenic determinant and plays important roles in pathogenicity and virulence of pathogen during infection process. However, how plants respond to OA stress still needs further characterization. In this study, we observed the physiological and molecular responses of Arabidopsis thaliana to OA stress. The leaves of 6-wk-old A. thaliana were sprayed with OA and distilled water respectively, and 0, 2, 4, 8, 12, and 24 h later, the leaves were collected and the contents of MDA, H2O2, and GSH, and the activities of CAT, SOD, and POD were determined and the expressions of PR1 and PDF1.2 were also studied. Under the stress of 30 mmol L-1 OA, SOD activity was first enhanced to reduce the accumulation of O2.-. But immediately, POD, CAT, and GSH all decreased extremely resulting in the accumulation of H2O2, and the MDA content increased 24 h later. GSH activity was enhanced significantly at 24 h after OA used. However, H2O2 wasn＇t eliminated at the same time, suggesting that the activity inhibitions of POD and CAT might be the reasons that caused Arabidopsis cells＇ impairment under OA stress. RT-PCR results indicated that PDF1.2, a marker gene of the JA/ET signaling was significantly induced; PR1, an indicator gene in SA signaling, was slighlty induced from 8 to 12 h after OA stress. In conclusion, Arabidopsis may recruit metabolism of reactive oxygen, both JA/ET and SA signaling pathways to respond to OA stress. These results will facilitate our further understanding the mechanisms of plant response to OA and OA-dependent fungal infection.

关键词： Arabidopsis thaliana oxalic acid physiological response signaling pathway

Experimental Study of Air Layer Drag Reduction with Bottom Cavity for A Bulk Carrier Ship Model

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China Ocean Engineering 2019年第5期33卷 554-562页

作者： WU Hao ou Yong-peng Key Laboratory of High Performance Ship Technology (Wuhan University of Technology) Ministry of Education Wuhan 430063 China School of Transportation Wuhan University of Technology Wuhan 430063 China College of Naval Architecture and Ocean Engineering Naval University of Engineering Wuhan 430033 China

Air lubrication by means of a bottom cavity is a promising method for ship drag reduction. The characteristics of the bottom cavity are sensitive to the flow field around the ship hull and the effect of drag reduction, especially the depth of the bottom cavity. In this study, a ship model experiment of a bulk carrier is conducted in a towing tank using the method of air layer drag reduction (ALDR) with different bottom cavity depths. The shape of the air layer is observed, and the changes in resistance are measured. The model experiments produce results of approximately 20% for the total drag reduction at the ship design speed for a 25-mm cavity continuously supplied with air at Cq = 0.224 in calm water, and the air layer covers the whole cavity when the air flow rate is suitable. In a regular head wave, the air layer is easily broken and reduces the drag reduction rate in short waves, particularly when λ/Lw1 is close to one;however, it still has a good drag reduction effect in the long waves.

关键词： air layer drag reduction bulk carrier model test depth of cavity air layer shape

Amides as surrogates of aldehydes for C–C bond formation:amide-based direct Knoevenagel-type condensation reaction and related reactions

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Science China Chemistry 2020年第1期63卷 11-15页

作者： Wei ou Pei-Qiang Huang Department of Chemistry Fujian Provincial Key Laboratory of Chemical Biology College of Chemistry and Chemical Engineering Xiamen University

Aldehydes are perhaps the most versatile compounds that enable many C-C bond forming reactions,which are not amenable for other subclasses of carbonyl *** report the first use of amides as surrogates of aldehydes for C-C bond formation,namely,the direct Knoevenagel-type condensation based on *** one-pot method consists of controlled reduction of an amide with LDBIPA[LiAlH(iBu)2(OiPr)],Lewis acid-mediated release of a reactive iminium ion intermediate,nucleophilic addition,and in situ elimination of *** reaction shows good functional group *** also demonstrated that the Schwartz reagent could be used as an alternative of *** employment of nitromethane and a silyl enol ether as the nucleophiles opens an avenue for the unprecedented amide-based nitro-aldol condensation reaction and aldol condensation reaction,respectively.

关键词： amides Knoevenagel condensation C–C bond formation one-pot reaction amide transformation

Micro-scale photon source in a hybrid cQED system

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Chinese Physics B 2021年第4期30卷 92-96页

作者： Ming-Bo Chen Bao-Chuan Wang Si-Si Gu Ting Lin Hai-ou Li Gang Cao guo-Ping guo Key Laboratory of Quantum Information CASUniversity of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China Origin Quantum Computing Company Limited Hefei 230026China

Conerent photon source is an important element that has been widely used in spectroscopy,imaging,detection,and teleportation in quantum ***,it is still a challenge to realize micro-scale coherent emitters in semiconductor *** report the observation of gain in a cavity-coupled GaAs double quantum dot system with a voltage bias across the *** characterizing and analyzing the cavity responses to different quantum dot behaviors,we distinguish the microwave photon emission from the signal *** study provides a possibility to realize micro-scale amplifiers or coherent microwave photon sources in circuit quantum electrodynamics(cQED) hybrid systems.

关键词： SQUID array resonator double quantum dot electron-photon coupling photon emission