Yuchao Zhao

Learn More
Since the discovery of carbon nanotubes in 1991 by Iijima, there has been great interest in creating long, continuous nanotubes for applications where their properties coupled with extended lengths will enable new technology developments. For example, ultralong nanotubes can be spun into fibres that are more than an order of magnitude stronger than any(More)
Microstructures and mechanical properties of equal-channel angular pressing (ECAP) processed and naturally aged ultrafine grained (UFG) and coarse grained (CG) 7075 Al alloys as well as their evolutions during annealing were investigated. After the same natural aging, the tensile yield strength, ultimate strength, and microhardness of the UFG samples were(More)
Probabilistic emission inventories were developed for 1, 3-butadiene, mercury, arsenic, benzene, formaldehyde and lead for Jacksonville, Florida. Maximum Likelihood Estimation (MLE) or Method of Matching Moments (MOMM) is used to fit parametric distributions to empirical emission factor data to represent inter-unit variability. For data sets that contain(More)
Selective loss of leptin receptors in the ventromedial hypothalamic nucleus results in increased adiposity and a metabolic syndrome. 2008. Alterations in hepatic glucose and energy metabolism as a result of calorie and carbohydrate restriction. Inhibition of growth hormone signaling by the fasting-induced hormone FGF21. requirement for geranylgeraniol in(More)
Data sets used to estimate emission factors for air toxics often contain several values reported only as below detection limit. Such data sets are referred to as "censored." Typical approaches to dealing with censored data sets include replacing censored values with arbitrary values of zero, one-half of the detection limit, or the detection limit. Based(More)
During the 1980s and 1990s, a host of experiments on the micrometer and submicrometer scale, including microinden-tation [15], microtorsion [29, 30], and microbending [28], revealed a strong size effect on the yield strength and hardening of metals. Similar size effects were observed also in metal matrix composites with particle diameters in the micrometer(More)
Probabilistic emission inventories were developed for 1, 3-butadiene, mercury, arsenic, benzene, formaldehyde and lead for Jacksonville, Florida. Maximum Likelihood Estimation (MLE) or Method of Matching Moments (MOMM) is used to fit parametric distributions to empirical emission factor data to represent inter-unit variability. For data sets that contain(More)
Disclaimer This paper has not been subject to any EPA review. Therefore, it does not necessarily reflect the views of the Agency and no official endorsement should be inferred. The opinions, findings, and conclusions expressed represent those of the authors and not necessarily the EPA. Any mention of company or product names does not constitute an(More)
Two-dimensional Monte Carlo simulation can be used to estimate the variability and uncertainty of emissions of urban air toxics for use in human exposure and risk analysis. The key steps in the two-dimensional approach include fitting a parametric distribution to data representing variability in emissions, and to use a method such as bootstrap simulation to(More)
The study was undertaken to find whether microinjection of vasopressin (AVP) into the rostral ventrolateral medulla (rVLM) affects blood pressure (BP) and blood viscosity in rats and to analyze the effects of AVP-ergic mechanism in the rVLM on stress-induced hyperviscosity of rats. The results are as follows. (1) Microinjection of AVP into the rostral(More)
  • 1