Experimental investigations on the resistance performance of a high-speed partial air cushion supported catamaran

Yang, Jinglei,Lin, Zhuang,Li, Ping,Guo, Zhiqun,Sun, Hanbing,Yang, Dongmei The Society of Naval Architects of Korea 2020 International Journal of Naval Architecture and Oc Vol.12 No.1

The partial air cushion supported catamaran (PACSCAT) is a novel Surface Effect Ship (SES) and possesses distinctive resistance performance due to the presence of planing bottom. In this paper, the design of PACSCAT and air cushion system are described in detail. Model tests were carried out for Froude numbers ranging from 0.1 to 1.11, the focus is on the influence of air cushion system on resistance characteristics. Drag-reducing effect of air cushion system was proved by means of contrast tests in cuhionborne and non-cushionborne mode. Wave-making characteristics reflect that the PACSCAT would eventually enter planing regime, in which the air could just escape under the seals and the hull body could operate in a steady state. To acquire different air cushion pressure, air flow rate and leakage height were adjusted during tests. Experimental results show that the resistance performance in planing regime would decrease evidently as the increased air flow rate, however, the scheme with medium leakage height presents the best resistance performance in the hump region.

Magnetoelectric characteristics around resonance frequency under magnetic field in Pb(Zr, Ti)O3/Terfenol-D laminate composite

Yang-Yang Guo,Jian-Ping Zhou,Peng Liu 한국물리학회 2010 Current Applied Physics Vol.10 No.4

Dependence of magnetoelectric modulus and phasic difference on the bias magnetic field was studied in a magnetoelectric Pb(Zr, Ti)O3/Terfenol-D laminate composite. The shifts of both magnetoelectric resonant peak and phasic bounce under the bias magnetic field lead to a nonlinear relationship between them. The acoustic velocity of Terfenol-D has a nonlinear dependence on magnetic field, resulting in a similar relationship between the acoustic velocity of the composite and magnetic field. As a result, the magnetoelectric modulus and phase around the resonance frequency exhibit very sensitive dependences on the bias magnetic field.

LONG-TERM VARIATION STUDY OF CATACLYSMIC VARIABLES WITH PALOMAR TRANSIENT FACTORY

YANG, MICHAEL TING-CHANG,CHOU, YI,HU, CHIN-PING,SU, YI-HAO,HSIEH, HUNG-EN,LIN, CHING-PING,CHUANG, PO-SHENG,LIAO, NAI-HUI The Korean Astronomical Society 2015 天文學論叢 Vol.30 No.2

The Palomar Transient Factory is a project making use of a Schmidt 48 inch telescope located on the Palomar Mountain, which is surveying the sky with dynamical cadences. It was deployed in 2009 and the observed sky region is over 1200 square degrees. We have studied the long-term periodic variabilities of the known galactic cataclysmic variables (CVs). More than 20 of the sources had been found to have long term periodic signals, ranging from several tens of days to several hundreds of days. Some possible scenarios are proposed to explain the results, such as a magnetic field change of the companion star, precession of the accretion disk, triple systems and superoutburst cycles. Some preliminary discussion will be presented in this article.

IWApriori: An Association Rule Mining and Self-updating Method Based on Weighted Increment

Yang Yang,Na An,Ping Xie,Zhongdi Ge,Jing Dong,Yonghua Huo 한국통신학회 2020 한국통신학회 APNOMS Vol.2020 No.09

The mining of association rules plays an important role in fault prediction. Many studies have shown that there is an obvious temporal and spatial correlation between the failure records of the cluster system. Therefore, most cluster system failure prediction engines are built based on causal correlation analysis between log events. However, the original system log file usually contains a large number of invalid records (duplicate or non-fault related records), which makes the mining of event correlation extremely difficult and seriously affects the efficiency and accuracy of fault prediction. Therefore, this paper proposes an association rule mining and self-updating method based on weighted increment, named IWApriori (improved weighted Apriori algorithm). The method includes two important steps: 1) log preprocessing; 2) mining and updating of association rules based on improved algorithm IWApriori. This method can effectively improve the rule completeness and realize the efficient mining and updating of rules in the whole life cycle of the system. In addition, we used the real log data set Blue Gene/L to validate our method. The results show that our association rule mining method is better than other methods in terms of time performance, space performance and the effectiveness of mining rules.

Positive Association of TEAD1 With Schizophrenia in a Northeast Chinese Han Population

Yang Sun,Lin Wen,Yi-Yang Luo,Wen-Juan Hu,Hui-Wen Ren,Ye Lv,Cong Zhang,Ping Gao,Li-Na Xuan,Guan-Yu Wang,Cheng-Jie Li,Zhi-Xin Xiang,Zhi-Lin Luan 대한신경정신의학회 2023 PSYCHIATRY INVESTIGATION Vol.20 No.12

Objective Schizophrenia is a complex and devastating psychiatric disorder with a strong genetic background. However, much uncertainty still exists about the role of genetic susceptibility in the pathophysiology of schizophrenia. TEA domain transcription factor 1 (TEAD1) is a transcription factor associated with neurodevelopment and has modulating effects on various nervous system diseases. In the current study, we performed a case–control association study in a Northeast Chinese Han population to explore the characteristics of pathogenic <i>TEAD1</i> polymorphisms and potential association with schizophrenia.Methods We recruited a total of 721 schizophrenia patients and 1,195 healthy controls in this study. The 9 single nucleotide polymorphisms (SNPs) in the gene region of <i>TEAD1</i> were selected and genotyped.Results The genetic association analyses showed that five SNPs (rs12289262, rs6485989, rs4415740, rs7113256, and rs1866709) were significantly different between schizophrenia patients and healthy controls in allele or/and genotype frequencies. After Bonferroni correction, the association of three SNPs (rs4415740, rs7113256, and rs1866709) with schizophrenia were still evident. Haplotype analysis revealed that two strong linkage disequilibrium blocks (rs6485989-rs4415740-rs7113256 and rs16911710-rs12364619-rs1866709) were globally associated with schizophrenia. Four haplotypes (C-C-C and T-T-T, rs6485989-rs4415740-rs7113256; G-T-A and G-T-G, rs16911710-rs12364619-rs1866709) were significantly different between schizophrenia patients and healthy controls.Conclusion The current findings indicated that the human <i>TEAD1</i> gene has a genetic association with schizophrenia in the Chinese Han population and may act as a susceptibility gene for schizophrenia.

Effects of Ga-doping on the microstructure and magnetic properties of MnBi alloys

Yang, Yang,Kim, Jong-Woo,Si, Ping-Zhan,Qian, Hui-Dong,Shin, Yongho,Wang, Xinyou,Park, Jihoon,Li, Oi Lun,Wu, Qiong,Ge, Hongliang,Choi, Chul-Jin Elsevier 2018 JOURNAL OF ALLOYS AND COMPOUNDS Vol.769 No.-

<P><B>Abstract</B></P> <P>The low temperature phase Mn<SUB>55</SUB>Bi<SUB>45-<I>x</I> </SUB>Ga<SUB> <I>x</I> </SUB> (<I>x</I> = 0, 1, 3, 5, and 10) alloys were prepared by induction melting process with subsequent low temperature annealing. The effects of Ga-doping on the crystal structure and magnetic properties of the alloys were systematically studied. The room temperature coercivities of Mn<SUB>55</SUB>Bi<SUB>45-<I>x</I> </SUB>Ga<SUB> <I>x</I> </SUB> after ball milling increased from 1.43 T for <I>x</I> = 0 to 1.66 T for <I>x</I> = 5, while the saturation magnetization decreased from 60.7 Am<SUP>2</SUP>/kg (<I>x</I> = 0) to 45.1 Am<SUP>2</SUP>/kg (<I>x</I> = 5). The maximum energy product (<I>BH</I>)<SUB>max</SUB> of Mn<SUB>55</SUB>Bi<SUB>44</SUB>Ga powders reached 7.87 MGOe. The Curie temperature of the Mn<SUB>55</SUB>Bi<SUB>45-<I>x</I> </SUB>Ga<SUB> <I>x</I> </SUB> alloys increased from 633 K to 658 K with increasing Ga concentration in the range of 0 ≤ <I>x</I> ≤ 5.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Effects of doping Ga on the microstructural and magnetic properties of MnBi alloy. </LI> <LI> The MnBi-Ga powders are achieved by surfactant assisted high energy ball milling. </LI> <LI> The maximum energy produce (<I>BH</I>)<SUB>max</SUB> shows 7.87 MGOe for Mn<SUB>55</SUB>Bi<SUB>44</SUB>Ga sample. </LI> <LI> The coercivity of Mn<SUB>55</SUB>Bi<SUB>40</SUB>Ga<SUB>5</SUB> after ball milling reached 1.66 T at room temperature. </LI> <LI> The elevated curie temperature (<I>T</I> <SUB>c</SUB>) by doping Ga makes it a possible candidate for high temperature applications. </LI> </UL> </P>

The effects of composition on microstructure and magnetic properties of MnBi alloys

Yang Yang,Yongho Shin,Hui-Dong Qian,Ping-Zhan Si,Jihoon Park,Oi Lun Li,Jong-Woo Kim,Chul-Jin Choi 한국자기학회 2018 한국자기학회 학술연구발표회 논문개요집 Vol.2018 No.11

Two-dimensional multiple-snapshot grid-free compressive beamforming

Yang, Yang,Chu, Zhigang,Ping, Guoli Elsevier 2019 Mechanical systems and signal processing Vol.124 No.-

<P><B>Abstract</B></P> <P>Compressive beamforming with planar microphone arrays can effectively achieve the two-dimensional direction-of-arrival (DOA) estimation and strength quantification of acoustic sources. This paper focuses on developing a multiple-snapshot grid-free method and comparing it against the existing grid-based and single-snapshot grid-free ones. The minimization of the atomic norm of multiple-snapshot microphone pressure induced by acoustic sources and the matrix pencil and pairing method are utilized jointly. The former is utilized to denoise the measured pressure and therefore obtain the pressure from acoustic sources. The latter is utilized to estimate DOAs and quantify strengths. Both simulations and experiments demonstrate the advantages of the developed method. For sources that are active across multiple snapshots, it can overcome the basis mismatch conundrum of the grid-based compressive beamforming. When the sources are uncorrelated or partially correlated in both spatial and temporal dimensions, it outperforms the single-snapshot grid-free compressive beamforming in terms of denoising, DOA estimation and strength quantification accuracy and resolution. These advantages stand up whether a standard uniform rectangular array or a non-uniform array constituted by a small number of microphones is utilized.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A two-dimensional multiple-snapshot grid-free compressive beamforming method is proposed. </LI> <LI> It can overcome the basis mismatch conundrum of the grid-based method. </LI> <LI> It enjoys obvious advantages over the single-snapshot grid-free method. </LI> </UL> </P>

Enhanced CO2/N2 separation performance in HP-Cu-BTCs by modifying the open-metal sites and porosity using added templates

Ping Yang,Rujin Zhou,Youhua Zhang,Shui Cao,Dan Zhang,Hongbing Ji,Linhai Duan,Xiuhong Meng 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.3

HP-Cu-BTCs (CTAB), HP-Cu-BTC(N,N), HP-Cu-BTC(SDBS) series with open metal coordination site Cu(I), cage window sites, tunable porosity, high specific surface area, cavity, etc., were synthesized using cationic surfactant (cetyltrimethylammonium bromide, neutral organic amine, and an anionic surfactant as templates, respectively, A variety of techniques were used to analyze the materials before and after CO2 cycle adsorption at 303K. A high BET specific surface area (1,194.06 m2/g) and total pore volume (0.63 cm3/g) were found in the synthesized HP-Cu-BTC(NN). The synthesized HP-Cu-BTC(N,N) not only has high CO2 adsorption capacity (7.4293 mmol/g) but also good selectivity (37.20) for adsorption separation of CO2/N2. Besides, FT-IR spectroscopy, CO2-TPD curves and adsorption kinetic curve demonstrated that the adsorption mechanism of synthesized HP-Cu-BTC(N,N) was mainly attributable to physisorption and it could be regenerated at relatively low temperature. The mesoporous structure not only improves the uptake capacity but also improves the diffusion and mass transfer of CO2. At the same time, the CO2-TPD showed that the HP-Cu-BTCs may have two major adsorption sites. One is to absorb CO2 molecules through van der Waals forces. The other is the electrostatic interaction of the open Cu sites with CO2. Therefore, the CO2/N2 adsorption selectivity of HP-Cu-BTC(N,N) is significantly higher than that of conventional Cu-BTC. After five consecutive adsorption/desorption cycles, the adsorbents retained an excellent adsorption property. Thus, it is a very good adsorbent for the CO2 capture.

Comparison of Gadobenate Dimeglumine and Gadopentetate Dimeglumine for Breast MRI Screening: a Meta-analysis

Yang, Xiao-Ping,Han, Yue-Dong,Ye, Jian-Jun,Chen, Gang,Luo, Ying,Ma, Hong-Xia,Yu, Xue-Wen,Niu, Juan-Qin,Ren, Fang-Yuan,Guo, You-Ming Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.12

Background: As a common and essential contrast medium at present, gadobenate dimeglumine has shown better performance than some other agents when applied to Breast Magnetic Resonance Imaging Screening (Breast MRI Screening). Nevertheless, reports on the diagnostic performance of these two mediums (gadobenate dimeglumine and gadopentetate dimeglumine) are not completely consistent. Objective: To assess the diagnostic value of gadobenate dimeglumine and gadopentetate dimeglumine for Breast MRI Screening in patients suffering from breast cancer and to provide more convinced evidence to guide clinical practice in terms of appropriate contrast agents. Data Sources and Review Methods: Original articles in English and Chinese published before January 2013 were selected from available databases (The Cochrane Library, PUBMED, EMBASE, Chinese Biomedical Literature Database, Chinese Scientific Journals Full-text Database, Chinese Journal Full-text). The criteria for inclusion and exclusion were based on the standard for diagnosis tests. Meta-Disc software (Version 1.4) was used for data analysis. Then, the area under curve (AUC) of SROC and the spearman rank correlation of sensitivity against (1-specificity) were calculated. Results: Total of 17 researches involving 1934 patients were included. The pooled sensitivity of gadobenate dimeglumine and gadopentetate dimeglumine were 0.99 (0.97, 1.00) and 0.93 (0.88, 1.00) respectively. The pooled specificity for these two contrast agents were 0.924 (0.902, 0.943) and 0.838 (0.817, 0.858) respectively, and the AUC of SROC curve were 0.9781 and 0.9215 respectively. Conclusions: Gadobenate dimeglumine can be regarded as a more effective and feasible contrast medium for Breast MRI Screening. At least 5% differences in diagnostic performance are usually considered as clinically relevant.