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Search Results: 1 - 10 of 126957 matches for " LI Qiyue "
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An Energy-Efficient MAC Protocol Using Dynamic Queue Management for Delay-Tolerant Mobile Sensor Networks
Jie Li,Qiyue Li,Yugui Qu,Baohua Zhao
Sensors , 2011, DOI: 10.3390/s110201847
Abstract: Conventional MAC protocols for wireless sensor network perform poorly when faced with a delay-tolerant mobile network environment. Characterized by a highly dynamic and sparse topology, poor network connectivity as well as data delay-tolerance, delay-tolerant mobile sensor networks exacerbate the severe power constraints and memory limitations of nodes. This paper proposes an energy-efficient MAC protocol using dynamic queue management (EQ-MAC) for power saving and data queue management. Via data transfers initiated by the target sink and the use of a dynamic queue management strategy based on priority, EQ-MAC effectively avoids untargeted transfers, increases the chance of successful data transmission, and makes useful data reach the target terminal in a timely manner. Experimental results show that EQ-MAC has high energy efficiency in comparison with a conventional MAC protocol. It also achieves a 46% decrease in packet drop probability, 79% increase in system throughput, and 25% decrease in mean packet delay.
The Experimental Investigation of Recirculation of Air-Cooled System for a Large Power Plant  [PDF]
Wanli Zhao, Qiyue Wang, Peiqing Liu
Energy and Power Engineering (EPE) , 2010, DOI: 10.4236/epe.2010.24041
Abstract: The paper introduces thermal buoyancy effects to experimental investigation of wind tunnel simulation on direct air-cooled condenser for a large power plant. In order to get thermal flow field of air-cooled tower, PIV experiments are carried out and recirculation ratio of each condition is calculated. Results show that the thermal flow field of the cooling tower has great influence on the recirculation under the cooling tower. Ameliorating the thermal flow field of the cooling tower can reduce the recirculation under the cooling tower and improve the efficiency of air-cooled condenser also.
Soil Compaction Effect of Bagged Grouting Piles in Saturated Soft Clay Subgrade

李启月, 吴正宇, 张电吉
LI Qiyue
, WU Zhengyu, ZHANG Dianji

- , 2018, DOI: 10.3969/j.issn.0258-2724.2018.05.020
Abstract: 为研究饱和软黏土路基条件下布袋注浆桩的挤土效应,以布袋注浆桩加固某饱和软黏土路基工程为例,通过现场试验对桩体成型过程中的桩周土体位移和超静孔隙水压力进行了分析.运用测斜管监测了成桩时桩周土体的水平位移,得到了土体位移的分布特征和土体位移随注浆压力与时间的变化规律;运用孔压计监测了成桩时桩周土体中超静孔隙水压力,得到了超静孔隙水压力的分布规律与变化趋势.试验结果表明:成桩后,桩周土体水平位移呈现“马鞍形”分布,在距离地表0.1~0.3倍和0.8~1.0倍的桩长位置处出现最大位移;桩体成型挤土产生水平位移的范围约为桩径的6倍;桩体养护成型后,标准施工下的注浆压力对挤土效应的影响甚微,同时桩周土体水平位移会出现明显回弹,回弹位移值为注浆当天的40%~60%;超静孔隙水压力在前10 d消散较快,超静孔隙水压比随土体与桩体间距离的增加而呈现近似于线性规律的衰减,其影响范围约为10倍桩径.
:To study the soil compaction effect of bagged grouting piles in saturated soft clay roadbeds,field tests were conducted on roadbeds reinforced with bagged grouting piles to analyse the displacement of the soil and the applied super-static pore pressure occurring during pile formation. First,the horizontal displacement of the soil was monitored by using the inclined pipe,and the distribution characteristics of soil displacement and variation in soil displacement with grouting pressure and time were obtained. Second,the super-static pore pressure in the soil was monitored by using a sensor to measure the hole pressure,and the distribution and trend of the super-static pore pressure were obtained. The test results indicate that the horizontal displacement of the soil around the pile has a saddle-shaped distribution,and the soil exhibits maximum displacement at a distance of 0.1-0.3 times and 0.8-1.0 times the pile length. The range of influence of the horizontal displacement caused by soil compaction is approximately six times the pile diameter. After the pile has been cured,the grouting pressure has little influence on the compaction effect. Furthermore,after curing,the horizontal displacement of the soil around the pile shows a significant rebound,which amounts to approximately 40%-60% of the displacement on the day of grouting. The super-static pore pressure dissipates rapidly during the first 10 days and decreases linearly with increasing distance from the centre of the pile. The range of influence of the super-static pore pressure is approximately 10 times the pile diameter
Try a Theory Management in of Make People the Center
Qianxing Zhu,Qiyue Ma
International Journal of Business and Management , 2009,
Abstract: This text discussed what is manage of make people the center, how attain to make people the center, and emphasize the management principle that we insist to make people the center, the construction has the modern management style of[with] Chinese special features, since is in ancient people's inheritting of this thought and promote, and then is constucting the experience summary of modern management style road of having the Chinese special features.
A Modified Delta-Shaped Gastroduodenostomy in Totally Laparoscopic Distal Gastrectomy for Gastric Cancer: A Safe and Feasible Technique
Changming Huang, Mi Lin, Qiyue Chen, Jianxian Lin, Chaohui Zheng, Ping Li, Jianwei Xie, Jiabin Wang, Jun Lu
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0102736
Abstract: Background The present study introduced a modified delta-shaped gastroduodenostomy (DSG) technique and assessed the safety, feasibility and clinical results of this procedure in patients undergoing totally laparoscopic distal gastrectomy (TLDG) for gastric cancer (GC). Materials and Methods A total of 102 patients with distal GC undergoing TLDG with modified DSG between January 2013 and December 2013 were enrolled. A retrospective study was performed using a prospectively maintained comprehensive database to evaluate the results of the procedure. Univariate and multivariate analyses were performed to estimate the predictive factors for postoperative morbidity. Results The mean operation time was 150.6±30.2 min, the mean anastomosis time was 12.2±4.2 min, the mean blood loss was 48.2±33.2 ml, and the mean times to first flatus, fluid diet, soft diet and postoperative hospital stay were 3.8±1.3 days, 5.0±1.0 days, 7.4±2.1 days and 12.0±6.5 days, respectively. Two patients with minor anastomotic leakage after surgery were managed conservatively; no patient experienced any complications around the anastomosis, such as anastomotic stricture or anastomotic hemorrhage. Univariate analysis showed that age, gastric cancer with hemorrhage and cardiovascular disease combined were significant factors that affected postoperative morbidity (P<0.05). Multivariate analysis found that gastric cancer with hemorrhage was the independent risk factor for the postoperative morbidity (P = 0.042). At a median follow-up of 7 months, no patients had died or experienced recurrent or metastatic disease. Conclusions The modified DSG was technically safe and feasible, with acceptable surgical outcomes, in patients undergoing TLDG for GC, and this procedure may be promising in these patients.
Research on Different Feature Parameters in Speaker Recognition  [PDF]
Qiyue Liu, Mingqiu Yao, Han Xu, Fang Wang
Journal of Signal and Information Processing (JSIP) , 2013, DOI: 10.4236/jsip.2013.42014

Feature parameters extraction is critical for speaker recognition research. The paper presents the function of pitch, formant and Mel frequency central coefficient (MFCC) in speaker recognition. It can increase the identification rate effectively for feature parameter sorts the speech corpus. Using Euclid Distance to compare feature parameters is very effective.


LIU Zhixiang,LI Xibing,ZHAO Guoyan,LI Qiyue,WANG Weihua,

岩石力学与工程学报 , 2010,
Abstract: According to experimental results of four kinds of cemented backfills with the ratios of cements to tailings 1∶4,1∶8,1∶10 and 1∶12,the laws of three-dimensional energy dissipation of backfill are presented during the course of breakage. According to the characters of stress transfer and energy release in rock mass during deposit exploiting,the laws of energy release in excavated rock mass are researched;and the results show that the deeper ore body in underground is,or the bigger the elastic modulus of rock mass is,as well as the lower the Poisson(s ratio of rock mass is,the higher the energy release in excavated rock mass is. With the characters of energy dissipation in coupling action between backfill and rock mass,their reasonable matches can be explored,and the feasibility,in which the lowest ratio 1∶12 of cement to tailings can be adopted in Anqing Copper Mine,is verified. The results show that the matching coefficient K between backfill and rock mass correlates with three- dimensional geostresses,mechanical parameters of backfill and rock mass;and it is necessary to design reasonable compression strength of backfill and to realize reasonable match between backfill and rock mass under different mining conditions.
Aerosol retrieval and atmospheric correction of HJ-1 CCD data over Beijing

FANG Li,YU Tao,GU Xingf,WANG Shupeng,GAO Jun,LIU Qiyue,

遥感学报 , 2013,
Abstract: Compared to moderate/low resolution satellite sensors for aerosol detection, the high spatial resolution of HJ-1 CCD camera (30 m) provides an opportunity to easily find spectrally pure pixels (SPP) over urban areas. In this study, we developed an SPP algorithm for urban Aerosol Optical Depth (AOD) retrieval using HJ-1 CCD data. Pixel Purity Index (PPI) is used to identify the pure pixels in the image. The surface reflectances of the pure pixels were estimated from the multi-temporal CCD measurements of HJ-1A and HJ-1B based on the surface Bi-directional Reflectance Distribution Function (BRDF) model. Then the AOD can be retrieved from satellite measurements. The comparison with ground-based AErosol RObotic NETwork AERONET AOD measurements shows good performance of our algorithm. A significant correlation coefficient with R=0.83 was obtained with a linear regression slope close to 1 and a intercept of 0.053. With the retrieved AOD as an input, HJ-1CCD data over urban areas was significantly improved after the atmospheric correction.
Application of liquid CO2 phase change rock breaking technology in metro foundation pit excavation

LI Qiyue
, LIU Xiaoxiong, WU Zhengyu, XIE Xiaofeng

- , 2018,
Abstract: 针对硬岩地质的地铁基坑开挖工程,传统的炸药破岩技术存在着炸药审批困难、储存运输风险高和爆破能量难以控制等问题。为解决上述问题,以长沙某地铁基坑开挖工程为背景,运用液态CO2相变破岩技术替代传统炸药爆破进行破岩开挖,并对其破岩效果和安全性进行分析与监测。研究结果表明:液态CO2相变破岩技术在破岩效果上能替代传统炸药爆破的方式,在安全性上符合爆破安全规程规定,可在类似硬质岩体的开挖工程中推广使用。
In the subway excavation project of hard rock geology, the traditional explosive breaking technology has the problems such as the difficulty of the examination and approval, the high storage and transportation risk, and the difficult control of blasting energy and so on. Aimed at the above problems, the Changsha subway excavation project as the background, the liquid CO2 phase change rock breaking technology was used to replace the traditional blasting for rock excavation, rock breaking efficiency and safety were analyzed and monitored. The results show that the liquid CO2 phase change rock breaking technology can replace the traditional explosive blasting method in rock breaking efficiency, comply with safety regulations for blasting in safety, and can be used in similar hard rock excavation engineering application

Mei Qiyue,

岩石力学与工程学报 , 2001,
Abstract: Tianhuangping pumped storage power station is located in Anji County, Zhejiang Province. The field of 500 KV switch yard is a pivotal project of the power station and formed by excavating mountain slope. The rock slope slid above the switch yard field during construction period on March 10, 1996. According to the research and treatment on this slope sliding, the forming conditions, influence factors and working mechanism of slope sliding are studied.
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