Rock-breaking analysis model of new drill bit with tornado-like bottomhole model

Jia-lin Tian,Chang-fu Yuan,Lin Yang,Chuan-hong Fu,Gang Liu,Zhi Yang,Chun-ming Wu 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.4

For improving the rock-breaking efficiency of oil and gas drill bits, a new drill bit is presented with tornado-like bottomhole model(named swirling cutting bit). The new drill bit cutter breaks rock with shocking and cutting effect during the drilling process, and theelements on largest ring cross the borehole center with high speed. It can effectively improve the center rock-breaking efficiency. Meanwhile,for all cutters on different rings breaking rock at the same time, it can optimize the rock-breaking volume of each element andimprove the bit service life. To analyze the interaction features between cutters and rock, the position equations are established by thecylindrical coordinates and complex movement principles, and then the velocity and acceleration equations can be obtained. Based on thenumerical example results, this paper analyzes the bottomhole model, the contact section, and the distribution features of velocities andaccelerations on different rings. By analyzing the acceleration results, we can study the failure mechanism of cutters. At the same time,lab experiments test the bottomhole model and rock-breaking features, and it verifies the accuracy of calculation method and equations. Moreover, the analysis method and models are also applicable to other types of bits or composite bits, and the inputting parameters needcorresponding adjustment for different type of bits.

Research on Analysis of Sports Video Multi-Pattern Fusion

Jia Wang,Haitao Yang,Yang Wang,Jingmeng Sun 보안공학연구지원센터 2015 International Journal of Database Theory and Appli Vol.8 No.6

In order to effectively integrate multimodal information and multilayer constraints, we present a unified probabilistic framework for sports video analysis. Based the framework, three instances of statistical models are constructed and compared. Experimental results indicate our method with multimodal fusion processes semantic events in sports video more effectively.

Facile preparation and characterization of tough poly(vinyl alcohol) organohydrogels with low friction and self-cleaning properties

Jia Yang,Jiajia Hao,Chen Tang,Yaxin Guo,Mingxin Guo,Zhipeng Li,Shuzheng Liu,Hui Yu,Gang Qin,Qiang Chen 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.116 No.-

Although many hydrogels have been applied to wearable sensors, it is still challenging to simultaneouslyrealize hydrogels with optical transparency, superior mechanical properties, excellent sensing performance,and anti-freezing by using inexpensive raw materials and an easy preparation process. Herein,using ethylene glycol/H2O (EG/ H2O) as a solvent, poly(vinyl alcohol)/EG organohydrogel (PVA/EGOHG) was prepared by a simple heating and frozen-thawing method. Owing to the multifunctionalityof EG (i.e., physical cross-linker, anti-freezer and co-solvent), PVA/EG OHG demonstrated excellent integratedproperties, including high strength, high toughness, and anti-freezing performances. Besides, PVA/EG OHG also showed low friction, self-cleaning, and frost resistance properties. After the introduction ofLiCl, ionically conductive PVA/EG @LiCl organohydrogel was served as a self-cleaning strain sensor, whichcould be long-term stable to detect the motions of human under room and low temperatures. The studyprovides to further understanding of the organohydrogel, which will help us design next-generationhigh-performance organohydrogels.

Double-Matching Resource Allocation Strategy in Fog Computing Networks Based on Cost Efficiency

Jia, Boqi,Hu, Honglin,Zeng, Yu,Xu, Tianheng,Yang, Yang The Korean Institute of Communications and Informa 2018 Journal of communications and networks Vol.20 No.3

Fog computing is an advanced technique to decrease latency and network congestion, and provide economical gains for Internet of Things (IoT) networks. In this paper, we investigate the computing resource allocation problem in three-layer fog computing networks. We first formulated the resource allocation problem as a double two-sided matching optimization problem. Then, we propose a double-matching strategy for the resource allocation problem in fog computing networks based on cost efficiency, which is derived by analysing the utility and cost in fog computing networks. The proposed double-matching strategy is an extension of the deferred acceptance algorithm from two-side matching to three-side matching. Numerical results show that high cost efficiency performance can be achieved by adopting the proposed strategy. Furthermore, by using the proposed strategy, the three participants in the fog computing networks could achieve stable results that each participant cannot change its paired partner unilaterally for more cost efficiency.

Mitochondrial citrate accumulation drives alveolar epithelial cell necroptosis in lipopolysaccharide-induced acute lung injury

Yang Hui-Hui,Jiang Hui-Ling,Tao Jia-Hao,Zhang Chen-Yu,Xiong Jian-Bing,Yang Jin-Tong,Liu Yu-Biao,Zhong Wen-Jing,Guan Xin-Xin,Duan Jia-Xi,Zhang Yan-Feng,Liu Shao-Kun,Jiang Jian-Xin,Zhou Yong,Guan Cha-Xi 생화학분자생물학회 2022 Experimental and molecular medicine Vol.54 No.-

Necroptosis is the major cause of death in alveolar epithelial cells (AECs) during acute lung injury (ALI). Here, we report a previously unrecognized mechanism for necroptosis. We found an accumulation of mitochondrial citrate (citratemt) in lipopolysaccharide (LPS)-treated AECs because of the downregulation of Idh3α and citrate carrier (CIC, also known as Slc25a1). shRNA- or inhibitor–mediated inhibition of Idh3α and Slc25a1 induced citratemt accumulation and necroptosis in vitro. Mice with AEC-specific Idh3α and Slc25a1 deficiency exhibited exacerbated lung injury and AEC necroptosis. Interestingly, the overexpression of Idh3α and Slc25a1 decreased citratemt levels and rescued AECs from necroptosis. Mechanistically, citratemt accumulation induced mitochondrial fission and excessive mitophagy in AECs. Furthermore, citratemt directly interacted with FUN14 domain-containing protein 1 (FUNDC1) and promoted the interaction of FUNDC1 with dynamin-related protein 1 (DRP1), leading to excessive mitophagy-mediated necroptosis and thereby initiating and promoting ALI. Importantly, necroptosis induced by citratemt accumulation was inhibited in FUNDC1-knockout AECs. We show that citratemt accumulation is a novel target for protection against ALI involving necroptosis.

Experimental study on CO2 bubble dynamics under different solution viscosity and absorbent concentration

Yang Jia-xi,Gao Dan,Qi You-wei,Zhang Heng 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.8

Carbon dioxide (CO2) emitted by fossil energy combustion is related to the greenhouse effect. To furtherstudy the motion dynamics of CO2 bubbles in various solutions so as to better absorb them, a CO2 bubble experimentalplatform was built. The growth and motion of a single CO2 bubble were experimented in five concentrations ofNaOH, NaHCO3 solutions and five viscosity deionized waters, photographed with a high-speed camera and importedinto PyCharm for analysis. Based on this, four kinds of CO2 bubbles were experimentally studied. The results show thatthe viscosity leads to the increase of rising time; the maximum rise time is 0.518 s when the viscosity is 100 mPa·s, theaspect ratio  of CO2 bubble in solution, there will be an “L” distribution, and the minimum rise time is close to risingafter the bubble is separated from the injector. NaHCO3 inhibits the reaction between NaOH solution and CO2, resultingin the cross-section ratio  change decreasing. The concentration of NaOH solution most conducive to CO2absorption is 0.039 g/ml and 0.058 g/ml.

Identification and Association of SNPs in TBC1D1 Gene with Growth Traits in Two Rabbit Breeds

Yang, Zhi-Juan,Fu, Lu,Zhang, Gong-Wei,Yang, Yu,Chen, Shi-Yi,Wang, Jie,Lai, Song-Jia Asian Australasian Association of Animal Productio 2013 Animal Bioscience Vol.26 No.11

The TBC1D1 plays a key role in body energy homeostasis by regulating the insulin-stimulated glucose uptake in skeletal muscle. The present study aimed to identify the association between genetic polymorphisms of TBC1D1 and body weight (BW) in rabbits. Among the total of 12 SNPs detected in all 20 exons, only one SNP was non-synonymous (c.214G>A. p.G72R) located in exon 1. c.214G>A was subsequently genotyped among 491 individuals from two rabbit breeds by the high-resolution melting method. Allele A was the predominant allele with frequencies of 0.7780 and 0.6678 in European white rabbit (EWR, n = 205) and New Zealand White rabbit (NZW, n = 286), respectively. The moderate polymorphism information content (0.25<PIC<0.50) was present in both breeds. The association analysis revealed that genotypes GA and AA had higher 35 d body weight (BW) than genotype GG in both EWR (p<0.01) and NEW (p<0.05). For the 56 d BW and 70 d BW traits, genotypes AA and GA were higher than genotype GG in both two breeds, the difference was not significant (p>0.05). Our results implied that the c.214G>A of TBC1D1 gene might be one of the candidate loci affecting the trait of 35 d BW in the rabbit.

The study of Harvest System for Organic Perishable Vegetable in Plugs

( Jia-ming Yang ),( Xie-zhi Li ),( Kuang-wen Hsieh ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1

Vegetable is the indispensable food for the daily life of mankind. Due to the demand for increasing the quality of vegetable in Taiwan, the protected culture must be developed for cultivation of vegetable. There are two common approaches of cultivation, including seeding and plug transplant, and both approaches require much labor. By applying the Organic Perishable Vegetable in Plugs planted, the labor problem in the past for plug seeding, sprout cultivation, transplantation and harvesting could be improved. Besides, the yield and quality could be increased. However, the short of labor is still a major problem for harvesting. This study would develop a set of harvesting machinery that is applicable for Organic Perishable Vegetable in Plugs. This could reduce the time and labor for harvesting in fields, and reach the objectives of saving of labor and increasing the productivity.

U.S. INTEREST RATES AND PORTFOLIO INVESTMENTS IN LATIN AMERICA

Jia wen Yang People&Global Business Association 1997 Global Business and Finance Review Vol.2 No.1

This paper analyzes the relationship between U.S. interest rates and portfolio investments in four Latin American countries: Argentina, Brazil, Chile, and Mexico. The paper finds that U.S. interest rate fluctuations have a significant negative impact on capital flows to these countries, including direct investment and other capital as well as portfolio capital flows. Differences do exist across countries and they relate to country-specific macroeconomics policies and financial reforms. The findings of this study have important implications for international monetary and financial issues and macroeconomic policies in emerging markets.

Numerical study on aerodynamics of banked wing in ground effect

Jia, Qing,Yang, Wei,Yang, Zhigang The Society of Naval Architects of Korea 2016 International Journal of Naval Architecture and Oc Vol.8 No.2

Unlike conventional airplane, a WIG craft experiences righting moment and adverse yaw moment in banked turning in ground effect. Numerical simulations are carried out to study the aerodynamics of banked wing in ground effect. Configurations of rectangular wing and delta wing are considered, and performance of endplates and ailerons during banking are also studied. The study shows that righting moment increase nonlinearly with heeling angle, and endplates enhance the righting. The asymmetric aerodynamic distribution along span of wing with heeling angle introduces adverse yaw moment. Heeling in ground effect with small ground clearance increases the vertical aerodynamic force and makes WIG craft climb. Deflections of ailerons introduce lift decrease and a light pitching motion. Delta wing shows advantage in banked turning for smaller righting moment and adverse yaw moment during banking.