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Search Results: 1 - 10 of 28426 matches for " Yunlin Sun "
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Analysis on the Effect of Shading on the Characteristics of Large-scale on-grid PV System in China  [PDF]
Yunlin Sun, Xiangzhi Li, Ruijiang Hong, Hui Shen
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B042
Abstract: Because of rich solar resource and low land cost, a lot of large-scale ground-based grid-connected PV systems have been built in Northwest China. In this paper, some shading phenomena on a grid-connected PV system inNorthwest Chinaare classified and analyzed. Through the I-V curve test of PV modules, it can be seen that dust influence system performance of the grid-connected PV system. And the experimental results have shown that shading could affect the electrical properties of PV modules. Meanwhile, same shading area on different shading positions could have different impacts on the identical PV module.
Exploring Pragmatic Failure into the Writing of Young EFL Learners: A Critical Analysis
Peter Yunlin Muir,Zongfang Xu
English Language Teaching , 2011, DOI: 10.5539/elt.v4n4p254
Abstract: This present study provides overviews of the phenomenon in EFL writing instruction in basic education in mainland China, which in its natural sense never proceeds among young learners at high school level. Then it investigated 34 students’ short in-class compositions. Beyond many spelling and syntactic errors, their pragmatic failures are therefore categorized into pragmalinguistic and sociopragmatic failures in accordance with Jenny Thomas (1983). It finds that pragmalinguistic failures are as follows: verbose appositions, combination of two subordinate clauses, misunderstandings of word meaning, Chinese construction of sentences, run-on sentences, independent subordinate clauses, the omission of relative pronouns and that sociopragmatic failure, considerably rare, lies in their perception and expression of specific Chinese-based pragmatic conventions. The author argues that the causes of pragmatic failure are their limited language proficiency and L1 pragmatic transfer. Based on the investigation and findings of the study, the author puts forward some tentative solutions to achieve pragmatic appropriateness in writing: (1) Appropriate in-class introduction of target language pragmatic knowledge and culture; (2) The awareness of distinguishing the target language with L1.
Attenuation of photosynthetically available radiation (PAR) in Meiliang Bay under different winds and waves

ZHANG Yunlin~,

应用生态学报 , 2005,
Abstract: Based on the successive underwater irradiance measurement in situ from Jul. 12 to 17 in 2003, the attenuation of photosynthetically available radiation (PAR) and euphotic depth in Meiliang Bay were analyzed under different winds and waves. The results showed that the downward PAR attenuation coefficients ranged from 2.63 to 4.7 m(-1), with an average of 3.63 +/- 0.47 x m(-1), and the corresponding euphotic depth ranged from 0.98 to 1.75 m, with an average of 1.29 +/- 0.18 m, which demonstrated that phytoplankton and macrophyte could not grow below 1.5 m due to the lack of adequate solar radiation. The total suspended solids resulted from wind and wave increased the attenuation of light, with the downward attenuation coefficients of PAR being 2.63, 3.72 and 4.37 x m(-1) under small, medium and large wind and wave, respectively. Significant linear correlations were found between transparence, PAR attenuation coefficient, euphotic depth and total suspended solid, especially inorganic suspended solid, while chlorophyll a was the most nonsignificant light attenuator. Multiple stepwise linear regressions showed that inorganic suspended solid was the most important light attenuator dominating the light attenuation in wind-exposed Meiliang Bay.
Analysis of solar radiation variations over Nanjing region in recent 40 years

ZHANG Yunlin,QIN Boqiang,CHEN Weimin,

地理学报 , 2003,
Abstract: The data utilized in this analysis consisted of extraterrestrial radiation, global radiation, diffuse radiation, direct radiation, total cloud cover and relative sunshine. The annual variations and trend were analyzed for monthly mean daily total global, direct, and diffuse radiation on a horizontal surface and for the relations between global, direct, diffuse radiation and relative sunshine, total cloud cover. The climatological calculation equations of global and direct radiation are put forward. The results show that global and direct radiations are characterized by decrease and diffuse radiation by increase. The main causes are due to the increase of concentration of suspended particles and atmospheric turbidities rather than cloud cover variations.
On Intelligence Mechanism and Soft Computing

Su Yunlin,

计算机科学 , 1994,
Abstract: This paper purports to explore the relation between intelligence mechanism and soft computing. It points out that while there is the seeking of precise and optimal solutions in human's intelligence mechanism, there is also the seeking of approximate and suboptimal solutions. This makes it possible to employ the soft computing to the research on intelligence mechanism, furthermore to spur the advance in the research on intelligence mechanism.

Su Yunlin,

软件学报 , 1993,
Abstract: This paper purports to present an assertional proof for Peterson-Fischer 2-mutual exclusion algorithm. According to Nancy A. Lynch of MIT1], this was an open problem. Hence the significance of this paper is to fill the gap.
An approach to the influence of industrial structure on urban ecological environment
Cui Fengjun,Ru Jiang,Xu Yunlin,
Cui Fengjun
,Ru Jiang,Xu Yunlin

环境科学学报(英文版) , 1994,
Abstract: dustrial structure is key link of man's action to ecological environmental system. Its combina-tion type and intensity determine, to a great extent, economic benefit, resources utilization efficiency andstress on environment. So the assessment to the rationality of industrial structure is of great importance. Inpresent paper, the research theories and ways on relationship between industrial structure and ecological en-vironmental systems were put forward. Environmental carrying capacity (ECC) was adopted to describequantitatively the relationship between man's social economic activity and environmental resources. At theend of this paper. analysis was made with Benxi City as an example.

LIU Hongyan,XU Yunlin,

生态学报 , 1996,
Abstract: After analyzing the main factors which affect algae growth in Jingbo Lake, a modelfor algae growth was constructed and the algal growth and eutrophication was predicted usinglaboratory and field data. In the algal growing season, N was not a main limiting factor in thelake. In July and August, P was the main limitation. In May, June, September and October,both P and temperature became limiting for algal growth. But with the increasing of P concentration, temperature became the main limitation, which played an adverse role in lake eutrophication. The model testing indicates that output of the model was able to reasonably reflect theregularity of algal growth in Jingbo Lake.
Research on Superplasticity and Superplastic Extrusion of MB26 Magnesium Alloy
Fuxiao CHEN,Juanhua SU,Yunlin YANG,Hongtao MA,

材料科学技术学报 , 2001,
Abstract: The superplastic flow characteristics of hot extruded MB26 Mg alloy under the conditions of tension are studied. The effects of deformation temperature and strain rate on superplasticity are analyzed. On the other hand, the superplastic extrusion of MB26 Mg alloy is also studied.
Lake Topography and Wind Waves Determining Seasonal-Spatial Dynamics of Total Suspended Matter in Turbid Lake Taihu, China: Assessment Using Long-Term High-Resolution MERIS Data
Yunlin Zhang, Kun Shi, Xiaohan Liu, Yongqiang Zhou, Boqiang Qin
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0098055
Abstract: Multiple comprehensive in situ bio-optical investigations were conducted from 2005 to 2010 and covered a large variability of total suspended matter (TSM) in Lake Taihu to calibrate and validate a TSM concentration estimation model based on Medium Resolution Imaging Spectrometer (MERIS) data. The estimation model of the TSM concentration in Lake Taihu was developed using top-of-atmosphere (TOA) radiance of MERIS image data at band 9 in combination with a regional empirical atmospheric correction model, which was strongly correlated with the in situ TSM concentration (r2 = 0.720, p<0.001, and n = 73). The relative root mean square error (RRMSE) and mean relative error (MRE) were 36.9% and 31.6%, respectively, based on an independent validation dataset that produced reliable estimations of the TSM concentration. The developed algorithm was applied to 50 MERIS images from 2003 to 2011 to obtain a high spatial and temporal heterogeneity of TSM concentrations in Lake Taihu. Seasonally, the highest and lowest TSM concentrations were found in spring and autumn, respectively. Spatially, TSM concentrations were high in the southern part and center of the lake and low in Xukou Bay, East Lake Taihu. The lake topography, including the water depth and distance from the shore, had a significant effect on the TSM spatial distribution. A significant correlation was found between the daily average wind speed and TSM concentration (r2 = 0.685, p<0.001, and n = 50), suggesting a critical role of wind speed in the TSM variations in Lake Taihu. In addition, a low TSM concentration was linked to the appearance of submerged aquatic vegetation (SAV). Therefore, TSM dynamics were controlled by the lake topography, wind-driven sediment resuspension and SAV distribution.
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