Papers by Keyword: Room Temperature

Abstract: The adsorption performance of commercial activated carbon (AC) for formaldehyde at room temperature was investigated. The BET surface area of AC is 805 m²/g, and the average pore diameter of AC was found to be 2.9 nm by the nitrogen adsorption method. The result of the adsorption capacity of AC showed that the removal ratio of formaldehyde was obviously increased with adsorption time in the first 5 hours and then was almost unchanged. The highest removal ratio of formaldehyde by AC is ~92%. The cycle test of the formaldehyde removal by AC indicated that the highest removal ratio of formaldehyde declined slightly with cycles and kept unchanged after 4 cycles. The lowest removal ratio of formaldehyde by commercial AC at room temperature still reached 80%.

Abstract: Silicon wafer bonding opens possibilities in creating MEMS devices and anodic bonding is found to be the most relevant wafer bonding technique process in constructing and packaging MEMS. This paper reports on the bond strength comparison between silicon and different glass based materials via anodic bonding. Two types of glass based surface used pyrex and soda lime glass. Bonding temperature is set at room temperature while a high direct current voltage of 15kV. Experiments were carried out using an in-house designed anodic bonder and the bond strength were measured using a bond strength tester. The anodic approach process was done in two sets which are before and after the cleaning process for each sample. Results show that all samples showed higher bond strength after the cleaning process. Silicon-soda lime glass have higher bonding strength of 1950 Pa compared to silicon-pyrex bonding which only gives 1850 Pa of bond strength.

Abstract: Use TPEG and AA , Through free radical polymerization in normal temperature conditions, Synthesis of the high-performance polycarboxylate superplasticizer. The results showed that, Room temperature synthesis of polycarboxylate superplasticizer with high temperature (60°C) synthesis of polycarboxylate superplasticizer have same performance. The synthesis process without heating, Production water without deionized water, To save energy, To greatly reduce the cost.

Abstract: The room-temperature ferromagnetism of Cr-doped cerium oxide (Ce_0.96Cr_0.04O_2δ) nanopowders synthesized using a sol-gel process is reported in this paper. XRD and Raman spectroscopy confirm that the Cr atoms successfully displaced some of the Ce atoms in the CeO₂ lattice without forming any impure phases. The results also confirmed that all calcined samples exhibited a single-phase fluorite structure. The crystallite size (as confirmed by XRD) and the particle size (as confirmed by Raman spectroscopy) increased as the calcination temperature increased. Magnetic measurements indicated that the room-temperature ferromagnetism of the sample was sensitive to the calcination temperature. When the calcination temperature increased, the saturation magnetization decreased while the coercivity increased, which corresponds to less dense and larger particles. The calcined sample at 400°C exhibited superior magnetic properties with the highest saturation magnetization (M_s) of 2.5 × 10^-2 emu/g (H_c ~ 1.27 kOe). The results of the Raman and X-ray photoelectron spectroscopies suggest that the nature of the observed room temperature ferromagnetism in the samples are likely a result of the oxygen vacancies induced by Cr-doping in CeO₂.

Abstract: In order to study the effect of the pH value of reaction system on the properties of polycarboxylate-based superplasticizers (PC) and on the cement workability, the PC are synthesized in different pH environments from 3 to 11 at room temperature. The results show the water-reducing performance of PC can be tuned by controlling the pH value of reaction system at room temperature, which affects not only the efficiency and rate of redox initiator systems but also the reactivity of active monomers.

Abstract: Effects of different methods of gas package on Steamed stuffed bun at room temperature in its shelf life were investigated. The Steamed stuffed bun were packaged under air, N₂ ,CO₂,or O₂, respectively, and then stored 45 days at 25°Cafter the high temperature sterilization. After the sterilization and during storage, the changes of Colorimetric, TPA , and Total viable count were determined. The results showed that carbon dioxide packaging can fully maintain the colorimetric in the high-temperature sterilization. Combining the results of the TPA and other results, carbon dioxide packaging has a better elasticity and chewiness. The package in carbon dioxide could improve the quality of steamed stuffed bun.

Abstract: Effects of different methods of gas package on freshness of harvested fresh Sweet Corn, at room temperature in its shelf life were investigated. The harvested fresh Sweet Corn were packaged under vacuum, air, N₂ or CO₂, respectively, and then stored 90 days at 30°Cafter the high temperature sterilization. After the sterilization and during storage, the changes of aerobic plate count, water content, soluble sugar content, and TPA were determined. The results showed that compared with others, the package with N₂ could inhibit the growth of microorganisms, kept the content of water, soluble sugar and fat. After 90 days, TPA showed that the package in nitrogen could improve the quality of sweet corns.

Abstract: EHD (Electrohydrodynamic) patterning forming micro structures with UV light curable materials at room temperature is investigated in this paper. It is a process for fabricating patterns on polymer film by applying electrical field to the template and the substrate as an electrode pair. The maintaining time of EHD patterning is reduced from several hours to tens of minutes by using UV curable polymer with low viscosity. The flat template generates the periodic pillars with micro scale. The periodic pillars with different period are obtained by varying the applied voltage in the different phase of experiment. The micro scale replication with good fidelity is produced by using patterned template made of doped silicon wafer.

Abstract: Combining the experimental teaching in polytechnic, the room temperature distribution of the experimental classroom in summer was analyzed by temperature measure and computer simulation. The results provide the foundation for the rationalization distribution of experimental equipment, person and air conditioner in experimental classroom. It helps to optimize teaching environment, reduce energy wastage, and avoid the hidden trouble bringing by hot summer.

Abstract: Effects of different methods of gas package on freshness of harvested waxy maize at room temperature in its shelf life were investigated. The harvested waxy maize were packaged under vacuum, air, N2 or CO2, respectively, and then stored 90 days at 30°Cafter the high temperature sterilization. After the sterilization and during storage, the changes of aerobic plate count, water content, soluble sugar content, and sensory evaluation were determined. The results showed that compared with others, the package with N2 could inhibit the growth of microorganisms, kept the content of water, soluble sugar and fat. After 90 days, the sensory evaluation could show that waxy maize of N2 package had better tasty and aroma.