Effect of relative humidity on non-refractory submicron aerosol evolution during summertime in Hangzhou, China

Abstract

To realize cooperative computation and communication in a relay mobile edge computing system, we develop a hybrid relay forward protocol, where we seek to balance the execution delay and network energy consumption. The problem is formulated as a nondifferentialbe optimization problem which is nonconvex with highly coupled constraints. By exploiting the problem structure, we propose a lightweight algorithm based on inexact block coordinate descent method. Our results show that the proposed algorithm exhibits much faster convergence as compared with the popular concaveconvex procedure based algorithm, while achieving good performance.

Simulation and analysis of heat transfer performance of electrical heating fabric at low temperature based on skin tissue

“…3. Heat transfer of the skin-electrical heating fabric system 3.1 Combined model of the skin-electrical heating fabric system Referring to the previous research of other members of our laboratory (Chen et al, 2018;Chen, 2018), the combined model of skin-electrical heating fabric was established. shows that the schematic diagram of the combined model.…”

“…Each zone of the combined model should be endowed with actual material properties. The parameters of electrical heating fabric are shown in Table 3 (Chen, 2018). The same cell size as the skin model is 0.25 mm for meshing and 164,923 cells, and 53,463 nodes can be obtained.…”

“…Referring to the previous experiment, the related parameters are given. Here, a is 0.12 m, b is 0.07 m, c is 0.001 m and three heating powers are 2.88 W, 4.08 W and 5.55 W, respectively (Chen, 2018). It is calculated that the heat generation loads are 200,000 W/m 3 , 283,333 W/m 3 and 381,944 W/m 3 respectively.…”

“…Referring to a previous study (Chen, 2018), the initial temperature of the human back wearing an electrical heating vest was actually measured as 318C, and the temperature reached 33.28C, 33.98C and 34.68C after electrification for 600 s when the powers of the heating element were 2.88 W, 4.08 W and 5.55 W, respectively at an ambient temperature of 10 8C. In the present study, the ambient temperature was set at 108C and the convective heat transfer coefficient was regarded as 10 W/(m 2 •k) setting the initial temperature of each zone of the skin model to the temperature obtained from experiment when the ambient temperature is 108C in Table 2 (In order to reduce the experimental error caused by different initial temperatures, the initial temperature setting in the following is consistent with it).…”

Air pollution control for a green future

“…baghouse filters or breathing masks regarding pressure drop and filtration efficiency. Chen et al (2018) investigated the effect of relative humidity (RH) on non-refractory submicron aerosol evolution during summertime in Hangzhou, China. The evolution and size distribution of submicron aerosols, including organic and inorganic species, are explored by the high-resolution time-of-flight aerosol mass spectrometry (HR-ToF-AMS) method under a variety of RH levels.…”