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| 1 | A Systematic Assessment of Blood Lead Level in Children and Associated Risk Factors in China显示文摘In this study, we searched multiple databases for all relevant original articles (1996-2013). To investigate blood lead levels (BLL) and possible risk factors for lead exposure among children in China A total of 388 articles met our inclusion criteria. The overall geometric mean (GM) BLL was 71 IJ.g/L, and the prevalence of elevated BLL (EBLL, defined as BLL 〉_100 Ixg/L) was l&.4&% among children. The prevalence of EBLL remained significantly higher among boys. In children less than 6 years of age, there were significantly increasing trends in both BLL and prevalence of EBLL in an age-dependent manner. The ban on leaded gasoline significantly reduced the BLL as well as EBLL prevalence; however, children whose parents had lower educational levels or were exposed to lead in the workplace had a higher EBLL prevalence. Despite its decline over time, the average BLL among children in China remains higher than the average level most recently reported in the United States. Childhood lead poisoning remains a public health problem in China. | WANG Lu LI Zhen HUANG Shao Xin DU Chuang WANG Hong HE Li Ping BI Yong Yi SHI Yong WANG Chun Hong | 2015 | Biomedical and Environmental Sciences2015，28，8： | 6 |
| 2 | Dynamics of charge‐pump phase‐locked loops显示文摘 | Paul F. Curran Chuang Bi Orla Feely | 2013 | Int J Circ Theor Appl2013，，11： | 1 |
| 3 | Extinction of Top-predator in a Three-level Food-chain Mode显示文摘 | CHUANG HSIUNG CHIU SZE BI HSU | 1998 | Journal of Mathematical Biology1998，37，： | 1 |
| 4 | Hedgehog signaling in mature osteoblasts regulates bone formation and resorption by controlling PTHrP and RANKL expression显示文摘 | Mak K K Bi Y Wan C Chuang P T Clemens T Young M | | 0，，5： | 1 |
| 5 | Proppant transport in rough fractures of unconventional oil and gas reservoirs显示文摘A method to generate fractures with rough surfaces was proposed according to the fractal interpolation theory.Considering the particle-particle,particle-wall and particle-fluid interactions,a proppant-fracturing fluid two-phase flow model based on computational fluid dynamics(CFD)-discrete element method(DEM)coupling was established.The simulation results were verified with relevant experimental data.It was proved that the model can match transport and accumulation of proppants in rough fractures well.Several cases of numerical simulations were carried out.Compared with proppant transport in smooth flat fractures,bulge on the rough fracture wall affects transport and settlement of proppants significantly in proppant transportation in rough fractures.The higher the roughness of fracture,the faster the settlement of proppant particles near the fracture inlet,the shorter the horizontal transport distance,and the more likely to accumulate near the fracture inlet to form a sand plugging in a short time.Fracture wall roughness could control the migration path of fracturing fluid to a certain degree and change the path of proppant filling in the fracture.On the one hand,the rough wall bulge raises the proppant transport path and the proppants flow out of the fracture,reducing the proppant sweep area.On the other hand,the sand-carrying fluid is prone to change flow direction near the contact point of bulge,thus expanding the proppant sweep area. | YIN Bangtang ZHANG Chao WANG Zhiyuan SUN Baojiang GAO Yonghai WANG Xiaopeng BI Chuang ZHANG Qilong WANG Jintang SHI Juntai | 2023 | Petroleum Exploration and Development2023，50，3： | 0 |
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