Effects of electromagnetic field and asymmetric Gaussian potential on low energy state energy of bound polaron in quantum well

Wang Ying-Hao,Chen Ying-Jie,Shao Feng-Lan 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.77 No.7

In this article, effects of electromagnetic field and asymmetric Gaussian potential (AGP) on the bound polaron's low energy state in quantum well are explored theoretically by the Lee-Low-Pines unitary transformation and Pekar type variational method. The variation of the ground state energy and the first excited state energy of the polaron with the Coulomb bound potential (CBP) strength at different electron-phonon coupling (EPC) constants, electric field (EF) strengths, heights and ranges of the AGP and magnetic field adjustment lengths are obtained. Our numerical results indicate that the polaron's low energy state depends on the EPC constant, the EF strength, the AGP's height and range and the CBP strength.

The Influence of a Second Metal on the Ni/SiC Catalyst for the Methanation of Syngas

( Lan Lan Song ),( Yue Yu ),( Xiao Xiao Wang ),( Guoq Jang Jin ),( Ying Yong Wang ),( Xiang Yun Guo ) 한국화학공학회 2014 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.52 No.5

The catalytic performance of silicon carbide supported nickel catalysts modified with or without secondmetal (Co, Cu and Zn) for the methanation of CO has been investigated in a fixed-bed reactor using a feed consisting of25% CO and 75% H2 without any diluent gas. It has been found that the introduction of Co species can clearly improvethe catalytic activity of Ni/SiC catalyst, whereas the addition of Cu or Zn can result in a significant decrease in the catalyticactivity. The characterizations by means of XRD, TEM, XPS, CO-TPD and H2-TPR indicate that the addition ofCo could decrease the particle size of active metal, increase active sites on the surface of methanation catalyst, improvethe chemisorption of CO and enhance the reducibility of methanation catalysts. Additionally, the special interaction betweenCo species and Ni species is likely favorable for the dissociation of adsorbed CO on the surface of catalyst, and this mayalso contribute to the high activity of 5Co-Ni/SiC catalyst for CO methanation reaction. For 5Cu-Ni/SiC catalyst and 5Zn-Ni/SiC catalyst, Cu and Zn species could cover partial nickel particles and decrease the chemisorption amount of CO. These could be responsible for the low methanation activity. In addition, a 150h stability test under 2 MPa and 300 oCshowed that 5Co-Ni/SiC catalyst was very stable for CO methanation reaction.

Diversity in life history of queen and worker honey bees, Apis mellifera L.

Ying Wang,Lan-Ting Ma,Baohua Xu 한국응용곤충학회 2015 Journal of Asia-Pacific Entomology Vol.18 No.2

Queen and worker European honey bees (Apis mellifera L.) have similar growth trends but differ greatly in their morphology, physiology, function and developmental timeline. Here, the life history of queen and worker bees was characterized, and reference pictures are provided. The developmental rate of workers was found to differ as much as 3 days, even if the two types of bees were laid within 12 h of each other. We also present some interesting phenomena with regards to the developmental stages of queen and worker bees.

siRNAs Derived from Cymbidium Mosaic Virus and Odontoglossum Ringspot Virus Down-modulated the Expression Levels of Endogenous Genes in Phalaenopsis equestris

Lan, Han-hong,Wang, Cui-mei,Chen, Shuang-shuang,Zheng, Jian-ying The Korean Society of Plant Pathology 2019 Plant Pathology Journal Vol.35 No.5

Interplay between Cymbidium mosaic virus (CymMV)/Odontoglossum ringspot virus (ORSV) and its host plant Phalaenopsis equestris remain largely unknown, which led to deficiency of effective measures to control disease of P. equestris caused by infecting viruses. In this study, for the first time, we characterized viral small interfering RNAs (vsiRNAs) profiles in P. equestris co-infected with CymMV and ORSV through small RNA sequencing technology. CymMV and ORSV small interfering RNAs (siRNAs) demonstrated several general and specific/new characteristics. vsiRNAs, with A/U bias at the first nucleotide, were predominantly 21-nt long and they were derived predominantly (90%) from viral positive-strand RNA. 21-nt siRNA duplexes with 0-nt overhangs were the most abundant 21-nt duplexes, followed by 2-nt overhangs and then 1-nt overhangs 21-nt duplexes in infected P. equestris. Continuous but heterogeneous distribution and secondary structures prediction implied that vsiRNAs originate predominantly by direct Dicer-like enzymes cleavage of imperfect duplexes in the most folded regions of the positive strand of both viruses RNA molecular. Furthermore, we totally predicted 54 target genes by vsiRNAs with psRNATarget server, including disease/stress response-related genes, RNA interference core components, cytoskeleton-related genes, photosynthesis or energy supply related genes. Gene Ontology classification showed that a majority of the predicted targets were related to cellular components and cellular processes and performed a certain function. All target genes were down-regulated with different degree by vsiRNAs as shown by real-time reverse transcription polymerase chain reaction. Taken together, CymMV and ORSV siRNAs played important roles in interplay with P. equestris by down modulating the expression levels of endogenous genes in host plant.

Structural behavior of the stiffened double-skin profiled composite walls under compression

Ying Qin,Yong-Wei Li,Xu-Zhao Lan,Yu-Sen Su,Xiang-Yu Wang,Yuan-De Wu 국제구조공학회 2019 Steel and Composite Structures, An International J Vol.31 No.1

Steel-concrete composite walls have been proposed and developed for applications in various types of structures. The double-skin profiled composite walls, as a natural development of composite flooring, provide structural and architectural merits. However, adequate intermediate fasteners between profiled steel plates and concrete core are required to fully mobilize the composite action and to improve the structural behavior of the wall. In this research, two new types of fasteners (i.e., threaded rods and vertical plates) were proposed and three specimens with different fastener types or fastener arrangements were tested under axial compression. The experimental results were evaluated in terms of failure modes, axial load versus axial displacement response, strength index, ductility index, and load-strain relationship. It was found that specimen with symmetrically arranged thread rods sustained more stable axial strain than that with staggered arranged threaded rods. Meanwhile, vertical plates are more suitable for practical use since they provide stronger confinement to profiled steel plate and effectively prevent the steel plate from early local buckling, which eventually enhance the composite action and increase the axial compressive capacity of the wall. The calculation methods were then proposed and good agreement was observed between the test results and the predicted results.

The International Influence of China’s Equipment Manufacturing Industry: Evidence from the WIOT

Wang Ying,Li Lan 한국유통과학회 2016 유통과학연구 Vol.14 No.10

Purpose - This study analyzes economic relations and mutual influence in the global equipment manufacturing industry (EMI) and China’s influence. Research design, data, and methodology - Data were collected from the World Input-Output Database (WIOT), looking at 16 countries. The sample time period was 2002-2011. Influence and motivation coefficients were calculated. Results - 1) China’s EMI showed a very strong influence coefficient, even surpassing world industrial powers like Japan, the USA, Germany, and Korea. 2) As for influence on added-value, China’s EMI motivation coefficient was ranked third in 2011, which meant it had a negligible effect on added-value. 3) From 2002 to 2011, both the influence and motivation coefficients of China’s EMI rose. Conclusions – China’s EMI has strong influence and motivation coefficients. It has a significant impact on the world EMI, especially on the total output of the global EMI. Additionally, during 2002 to 2011, the ranking of China’s EMI motivation coefficient improved year over year, and its economic efficiency obviously improved. By 2011, China’s EMI’s international influence was second only to the US and Japan.

Alterations in protein and amino acid metabolism in honeybees (Apis mellifera) fed different L-leucine diets during the larval stage

Lan-Ting Ma,Ying Wang,Weixing Zhang,HongfangWang,Zhenguo Liu,Baohua Xu 한국응용곤충학회 2016 Journal of Asia-Pacific Entomology Vol.19 No.3

L-Leucine is an important factor for growth and development in animals. However, very little is known about the nutritional role and physiological function of L-leucine in honeybees. In this study,we determined the effects of Lleucine supplementation on protein synthesis and amino acid balance in honeybee larvae. First instar larvaewere fed different L-leucine diets (6.45, 8.45 and 10.45 mg/g) during the entire larval stage. After the larvae egested urate crystals, we analyzed the protein and amino acid metabolism indexes in the larvae. There was little effect of L-leucine on larval body weight and body protein content, but the hemolymph protein concentrations were higher in 8.45 and 10.45 mg/g groups than 6.45 mg/g group. Compared to the 6.45 mg/g group, L-leucine significantly increased the contents of Ala, Leu, Lys and Met in 8.45 mg/g group and continued to be increased in 10.45 mg/g group. L-Leucine affected many TOR signaling pathway- and L-leucine metabolism-related genes, including tor, 4Ebp1, bcaat et al. Moreover, aspartate aminotransferase (AST), alanine aminotransferase (ALT), creatine kinase (CK) and lactate dehydrogenase (LDH) activities as well as the triglycerides (TG), total cholesterol (TCHO), uric acid (UA) and urea nitrogen (URER) contents in haemolymph were significantly different among treatments. These results suggested that many factors involved in the metabolism of L-leucine and larval hemolymph play important roles in honeybee protein synthesis and amino acid balance.

Compressive behavior of profiled double skin composite wall

Ying Qin,Yong-Wei Li,Yu-Sen Su,Xu-Zhao Lan,Yuan-De Wu,Xiang-Yu Wang 국제구조공학회 2019 Steel and Composite Structures, An International J Vol.30 No.5

Profiled composite slab has been widely used in civil engineering due to its structural merits. The extension of this concept to the bearing wall forms the profiled composite wall, which consists of two external profiled steel plates and infill concrete. This paper investigates the structural behavior of this type of wall under axial compression. A series of compression tests on profiled composite walls consisting of varied types of profiled steel plate and edge confinement have been carried out. The test results are evaluated in terms of failure modes, load-axial displacement curves, strength index, ductility ratio, and load-strain response. It is found that the type of profiled steel plate has influence on the axial capacity and strength index, while edge confinement affects the failure mode and ductility. The test data are compared with the predictions by modern codes such as AISC 360, BS EN 1994-1-1, and CECS 159. It shows that BS EN 1994-1-1 and CECS 159 significantly overestimate the actual compressive capacity of profiled composite walls, while AISC 360 offers reasonable predictions. A method is then proposed, which takes into account the local buckling of profiled steel plates and the reduction in the concrete resistance due to profiling. The predictions show good correlation with the test results.

Detrital zircon evidence for the antiquity of Taiwan

Ching-Ying Lan,Tadashi Usuki,Kuo-Lung Wang,Tzen-Fu Yui,Kazuaki Okamoto,Yuan-Hsi Lee,Takafumi Hirata,Yoshitaka Kon,Yuji Orihashi,Juhn G. Liou,Chun-Sun Lee 한국지질과학협의회 2009 Geosciences Journal Vol.13 No.3

In-situ U–Pb geochronology and Hf isotopic studies of zircons from the Pre-Tertiary basement complex and Eocene rocks of the Central Range of Taiwan were carried out to elucidate the history of detrital zircons older than 2.3 Ga. Zircons from the eastern Backbone Range and Eastern Central Range show Paleoproterozoic to late Neoarchean ages (2.3 –³2.5 Ga), whereas those from the Hsuehshan Range yield Neoarchean to Mesoarchean ages (2.6–3.2 Ga). The εHf(T) for the Paleoproterozoic to late Neoarchean zircons varies from –7.4 to +5.1, implying both juvenile crustal growth and reworking of old crusts. This dual origin could extend back to Mesoarchean–Paleoarchean (3.0–3.4 Ga) based on Hf isotopic model ages. Consistent but narrower εHf(T) values and Hf crustal model ages for zircons from Taiwan compared to Cathaysia suggest a possible common origin for these zircons, although Taiwan has a generally younger crustal evolution history than SE China.

Long Non-coding RNA CCAT1 Sponges miR-454 to Promote Chemoresistance of Ovarian Cancer Cells to Cisplatin by Regulation of Surviving

De-Ying Wang,Na Li,Yu-Lan Cui 대한암학회 2020 Cancer Research and Treatment Vol.52 No.3

Purpose Colon cancer-associated transcript 1 (CCAT1) was identified as an oncogenic long non-coding RNA (lncRNA) in a variety of cancers. However, there was a lack of understanding of the mechanism by which CCAT1 conferred cisplatin (also known as DDP) resistance in ovarian cancer cells. Materials and Methods Cell viability of A2780, SKOV3, A2780/DDP, and SKOV3/DDP cells upon cisplatin treatment was monitored by MTT assay. Quantitative reverse transcription polymerase chain reaction (qRT-PCR) detected the expression levels of CCAT1 and miR-454. The effect of sh-CCAT1 on cisplatin response was investigated in xenografts study. Bioinformatic analysis, luciferase reporter assay and qRT-PCR were conducted to validate the direct interaction among CCAT1, miR-454, and survivin. Apoptosis was determined by flow cytometry after dual staining of Annexin-V-FITC/propidium iodide, and the expression of apoptosis-related proteins Bcl-2, Bax and survivin were detected by qRT-PCR and Western blotting. Xenograft study was conducted to monitor in vivo tumor formation. Results CCAT1 was highly expressed in cisplatin-resistant ovarian cancer cell line A2780/DDP and SKOV3/DDP. Knockdown of CCAT1 restored sensitivity to cisplatin in vitro and in vivo. Our data revealed that silencing of CCAT1 promoted cisplatin-induced apoptosis via modulating the expression of pro- or anti-apoptotic proteins Bax, Bcl-2, and survivin. CCAT1 directly interacted with miR-454, and miR-454 overexpression potentiated cisplatin-induced apoptosis. Survivin was identified as a functional target of miR-454, restoration of survivin attenuated the effect of miR-454 on cisplatin response. In addition, miR-454 inhibitor or overexpression of survivin was found to abolish sh-CCAT1–induced apoptosis upon cisplatin treatment. Conclusion CCAT1/miR-454/survivin axis conferred cisplatin resistance in ovarian cancer cells.