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Search Results: 1 - 10 of 42889 matches for " HUANG Gang "
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An Index Measuring the Interannual Variation of the East Asian Summer Monsoon--The EAP Index
An Index Measuring the Interannual Variation of the East Asian Summer Monsoon ——The EAP Index

HUANG Gang,
HUANG
,Gang

大气科学进展 , 2004,
Abstract: Based on the EAP (East Asia/Pacific) teleconnection in the summer circulation anomalies over the Northern Hemisphere,an index measuring the strength of the East Asian summer monsoon,i.e.,the socalled EAP index,is defined in this paper.From the analyses of observed data,it is clearly shown that the EAP index defined in this study can well describe the interannual variability of summer rainfall and surfaceair temperature in East Asia,especially in the Yangtze River valley and the Hualhe River valley,Korea,and Japan.Moreover,this index can also reflect the interannual variability of the East Asian summer monsoon system including the monsoon horizontal circulation and the vertical-merldional circulation cell over East Asia.From the composite analyses of climate and monsoon circulation anomalies for high EAP index and for low EAP index,respectively,it is well demonstrated that the EAP index proposed in this study can well measure the strength of the East Asian summer monsoon.
Cooperative Loss Recovery for Reliable Multicast in Ad Hoc Networks  [PDF]
Mengjie HUANG, Gang FENG, Yide ZHANG
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2010, DOI: 10.4236/ijcns.2010.31010
Abstract: Providing reliable multicast service is very challenging in Ad Hoc networks. In this paper, we propose an efficient loss recovery scheme for reliable multicast (CoreRM). Our basic idea is to apply the notion of cooperative communications to support local loss recovery in multicast. A receiver node experiencing a packet loss tries to recover the lost packet through progressively cooperating with neighboring nodes, upstream nodes or even source node. In order to reduce recovery latency and retransmission overhead, CoreRM caches not only data packets but also the path which could be used for future possible use to expedite the loss recovery process. Both analytical and simulation results reveal that CoreRM significantly improves the reliable multicast performance in terms of delivery ratio, throughput and recovery latency compared with UDP and PGM.
Spatial and temporal variations of light rain events over China and the mid-high latitudes of the Northern Hemisphere
Gang Huang,GuanHuan Wen
Chinese Science Bulletin , 2013, DOI: 10.1007/s11434-012-5593-1
Abstract: Based on observed daily precipitation data, monthly gridded radiosonde upper air temperature and sea surface temperature data from the UK Met Office Hadley Centre, monthly surface air temperature from the Climatic Research Unit at the University of East Anglia and the NCEP/NCAR monthly reanalysis data, this study investigates the spatial and temporal variations of light rain events over China and the mid-high latitudes of the Northern Hemisphere during 1961–2010, and discusses the relationship between the change of light rain events and atmospheric stability, sea surface temperature and atmospheric circulation. The light rain events over East China display a decreasing trend of 3.0%/10 a in summer and winter half years. Over Northwest China, an increasing trend of 4.1%/10 a is found in winter half years, but there is no trend in summer half years. Using empirical orthogonal function (EOF) analysis, it is found that the first two principal components of light rain events over the mid-high latitudes of the Northern Hemisphere show long time scale variations in summer and winter half years. The first EOF modes (EOF1s) for summer and winter half years both depict a long-term increase in light rain events over North America and Southern Europe as well as Northwest China (except in summer half years), and a long-term decrease over most of the Eurasia (Central Europe, Eastern Europe, North Asia and East China). The second EOF mode (EOF2) for summer half year shows that light rain events increase over North America, Southern Europe and South China, but decrease over Eurasia north of 45°N from 1961 to early 1980s, while the trends reverse from late 1980s to 2010. The second EOF mode (EOF2) for winter half years indicates that light rain events increase over North America and South and North China, but decrease over Eurasia north of 40°N from 1961 to early 1980s, while the trends reverse from late 1980s to 2009. Correlation analysis and linear regression analysis suggest that EOF1s may be related to the change in atmospheric static stability associated with global warming, and EOF2s are possibly linked to the AMO.
The East Asian summer monsoon circulation anomaly index and its interannual variations
Gang Huang,Zhongwei Yan
Chinese Science Bulletin , 1999, DOI: 10.1007/BF02885855
Abstract: Based on the concept of East Asia-Pacific (EAP) teleconnection which influences East Asian summer monsoon, an index for East Asian summer monsoon circulation anomaly was defined and it was pointed out that this index can describle the interannual variation character of summer climate in East Asia, especially in the Yangtze River and Huaihe River Valley.
Logbook Language Characteristics and Recordation Requirement
Gang Huang,Jiang Shen
English Language Teaching , 2011, DOI: 10.5539/elt.v4n2p107
Abstract: With a view of the deficiency irregular phenomena existing in logbook recordation among Chinese crewmembers, this paper analyzed the language characteristics and recording requirement of logbook, expounded how to employ accurate, concise and precise words to record logbook, listed out matters to be paid attention to in the process of recording the logbook and took examples to make an analysis, with expectation to bring advantages for Chinese crewmembers to improve their competency of recording the logbook.
Study on the Impact of Perceived Network Externalities on Consumers’ New Product Purchase Intention  [PDF]
Yong Zhang, Gang Wan, Liuting Huang, Qiong Yao
Journal of Service Science and Management (JSSM) , 2015, DOI: 10.4236/jssm.2015.81012
Abstract: In the network economy era, the impact of network externalities on consumers’ new product purchase intention is increasingly significant. However, there is little empirical researches to explore the relationship between these two constructs. This research utilizes the Technology Acceptance Model (TAM) and combines it with perceived risk theory analyzing the relationship between perceived network externalities and new product purchase intention. The results of our empirical study show direct and indirect relationship. The perceived network externalities can influence consumers’ new product purchase intention directly. In addition, they have an indirect impact by influencing the perceived usefulness, perceived ease of use, and perceived risk.
Measurement of the free concentrations of alkyl phenols and bisphenol A to determine their biodegradation kinetics by activated sludge
Gang Shen,Jun Huang,Gang Yu
Chinese Science Bulletin , 2007, DOI: 10.1007/s11434-007-0377-8
Abstract: A negligible depletion-solid phase microextraction (nd-SPME) method is developed to measure free concentrations of two alkyl phenols (4-t-octylphenol, nonylphenol) and bisphenol A in activated sludge, with which aerobic biodegradation kinetics of three pollutants was determined. For the degradation of octylphenol, nonylphenol and bisphenol A, the apparent rate constant based on total concentration is 0.02, 0.01 and 0.03 h 1, respectively; with the half life being 34.9, 54.3 and 22.3 h correspondingly. Meanwhile, real rate constants based on free concentration are 0.74, 0.60 and 1.03 h 1, respectively; with the half life being 0.9, 1.2 and 0.7 h accordingly. Differences between two constants revealed that desorption of targeted pollutants from activated sludge should be the rate-limiting step. Compared to the rapid biodegradation of alkyl phenols and bisphenol A in free state, the desorption of pollutants from the sludge is relatively slow, which made the apparent biodegradation rate constants much lower.
Simulation of the East Asian Subtropical Westerly Jet Stream with GFDL AGCM (AM2.1)
HUANG Gang,LIU Yong,
HUANG Gang
,LIU Yong

大气和海洋科学快报 , 2011,
Abstract: The present study validated the capability of the AM2.1, a model developed at NOAA’s Geophysical Fluid Dynamics Laboratory (GFDL), in reproducing the fundamental features of the East Asian Subtropical Westerly Jet Stream (EASWJ). The main behaviors of the EASWJ are also investigated through the reanalysis of observational NCEP/NCAR data. The mean state of the EASWJ, including its intensity, location, structure, and seasonal evolution is generally well-portrayed in the model. Compared with the observation, the model tends to reproduce a weaker jet center. And, during summer, the simulated jet center is northward-situated. Results also demonstrate the model captures the variability of EASWJ during summer well. The results of the empirical orthogonal function (EOF) applied on the zonal wind at 200 hPa (U200) over East Asia for both the observation and simulation indicate an inter-decadal shift around the late 1970s. The correlation coefficient between the corresponding principle components is as great as 0.42 with significance at the 99% confidence level.
The Interannual Variability of Summer Rainfall in the Arid and Semiarid Regions of Northern China and Its Association with the Northern Hemisphere Circumglobal Teleconnection

HUANG Gang,LIU Yong,HUANG Ronghui,

大气科学进展 , 2011,
Abstract: Using the latest daily observational rainfall datasets for the period 1961--2008, the present study investigates the interannual variability of June--September (JJAS) mean rainfall in northern China. The regional characteristics of JJAS mean rainfall are revealed by a rotated empirical orthogonal function (REOF) analysis. The analysis identifies three regions of large interannual variability of JJAS rainfall: North China (NC), Northeast China (NEC), and the Taklimakan Desert in Northwest China (TDNWC). Summer rainfall over NC is shown to have displayed a remarkable dry period from the late 1990s; while over NEC, decadal-scale variation with a significant decreasing trend in the last two decades is found, and over TDNWC, evidence of large interannual variability is revealed. Results also show that the interannual variability of JJAS rainfall in northern China is closely associated with the Northern Hemisphere circumglobal teleconnection (CGT). Correlation coefficients between the CGT index and regional-averaged JJAS mean rainfall over NC and NEC were calculated, revealing values of up to 0.50 and 0.53, respectively, both of which exceeded the 99% confidence level.
Simulative Study on HPGL Interpolation Control Algorithms
一种HPGL插补控制算法仿真研究

HUANG Gang,
黄刚

计算机科学 , 2011,
Abstract: 为使HPGL格式文件输出的折线光滑化,分析了该格式文件数据输出存在的弊端及通常的解决办法。在此基础上,提出了一种基于遗传算法的插值处理方法,对该算法进行了数学描述,并对插值处理过程进行了数学解析。仿真实验结果表明,在对HPGL格式文件输出的折线进行若千次的插值处理过程中,只要将插值控制在设定的精度范围内,最终的运动轨迹就会形成一条光滑的曲线。
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