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Articles by Yang Dan
Total Records ( 2 ) for Yang Dan
  Yang Dan , Geng Ye-Liang and Hu Jian-Ping
  This study presents transmission gate flip-flop standard cells with channel length and dual-threshold techniques and their low-voltage operating. The proposed transmission gate flip-flops have the same structure with the basic master-slave transmission gate one using multiplexers, but the different place is the feedback path (non-critical path). In the non-critical path, the dual-channel length flip-flop uses high threshold devices while the dual-threshold flip-flop uses gate-length modulation device. Three flip-flop standard cells are investigated from 0.5 to 1.2 V in term of Energy Delay Product (EDP) with HSPICE at a SMIC 130 nm technology. The dual-threshold flip-flop standard cell achieves considerable leakage reductions and gate-length biasing flip-flop standard cell achieves the lowest total energy consumption in all the cells. The results demonstrate that scaling supply voltage using dual-threshold CMOS (low threshold and ultra high threshold) and gate-length biasing are advantageous, especially in low voltage regions (800-900 mv) which yield the best EDP.
  YANG Dan , QI Shi-Hua , ZHANG Jia-Quan , TAN Ling-Zhi , ZHANG Jun-Peng , ZHANG Yuan , XU Feng , XING Xin-Li , HU Ying , CHEN Wei , YANG Jun-Hua and XU Mei-Hui
  A soil survey was conducted in Zhangzhou City, an important agricultural region in south of the Fujian Province, China. 93 surface soil samples were collected in the paddy fields, vegetable lands, orchards and tea plantations from Zhangzhou City. An additional soil profile was sampled in a paddy field as previous research had indicated high concentrations of organochlorine pesticides (OCPs) in the paddy fields. Dichlorodiphenyltrichloroethanes (DDTs) ranged from 0.64–78.07 ng g−1 dry weight and hexachlorocyclohexanes (HCHs) ranged from 0.72–30.16 ng g−1 dry weight in the surface soil of the whole study region. Ratios of α-HCH/γ-HCH < 4 and o, p′-DDT/p, p′-DDT > 1 in all soil samples suggested that lindane and dicofol were widely applied in this region in the past. Concentrations of HCHs and DDTs in soils from the four land use types followed the orders: paddy fields > vegetable lands > tea plantations > orchards and tea plantations > orchards > paddy fields > vegetable lands, respectively. Analyses of the data showed no correlation (r < 0.1) between elevation and OCPs contents in paddy fields, orchards and vegetable lands, indicated no significantly different features in distribution of HCHs and DDTs in the soils from low lying plains and mountains and the unsystematic usage of OCPs, and highlighted the fragmented nature of agricultural production in Zhangzhou, as well as the reemission of OCPs from the soils, where high OCPs concentrations were found, in Longhai of Zhangzhou. In addition, no obvious relationship between the OCPs and total organic carbon (TOC) (r < 0.3) was observed in the soil profile. The mean contribution of dicofol in total DDTs was 66% in the whole Zhangzhou region. The approximate burdens of HCHs and DDTs in the surface layer of 0–20 cm were 0.44 and 1.55 t, respectively. The storage of both HCHs and DDTs in soil surface layer (0–20 cm) accounts for 40% burden of the soil layer of 0–50 cm (1.10 t HCHs and 3.87 t DDTs), in which the highest concentrations of OCPs were observed in soil profile.
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