Ma X.,China Institute of Metrology |
Tian G.,Shandong Product Quality Supervision and Inspection Research Institute |
Cao R.,China Institute of Metrology |
Li W.,China Institute of Metrology |
And 2 more authors.
CPEM Digest (Conference on Precision Electromagnetic Measurements) | Year: 2014
In this paper, a novel method to calibrate the leakage current measuring network is successfully designed by using high frequency voltage source. It has been verified that the measurement results consist with the requirements of IEC 60990. © 2014 IEEE.
Liang S.,Shandong University |
Shi Q.,Shandong University |
Shi Q.,Shandong Product Quality Supervision and Inspection Research Institute |
Gao X.,Shandong University |
Wang S.,Shandong University
Journal of Chemical Technology and Biotechnology | Year: 2015
BACKGROUND: This study attempts to elucidate the complex effect of Ca2+, an important divalent cation widely present in aqueous media, on perchlorate removal by autotrophic perchlorate reducing bacteria (PRB) associated with a zero-valent iron (ZVI) system. RESULTS: Batch flask test results showed that, in the presence of larger amounts of Ca2+, perchlorate removal initiated earlier and completed faster. According to the increase of differential chloride concentration, the respective contribution of biodegradation to perchlorate removal was evaluated and found to be improved with increasing amount of Ca2+. It appears that Ca2+ can delay pH increase by combining with OH- and can consequently extend biodegradation time. Despite the major contribution of biodegradation, when ZVI and Ca2+ co-existed, physiochemical perchlorate removal occurred earlier by both adsorption via surface charge neutralization and co-precipitation via formation of larger particles. The positive effect of Ca2+ was further evidenced in subsequent continuous column tests. As empty bed residence time (EBRT) was decreased, more reliable and effective perchlorate removal performance was observed with additional Ca2+ concentration of 240 mg L-1. CONCLUSION: Perchlorate removal by a PRB-ZVI system can be significantly improved with increasing amounts of Ca2+, which can be reasonably understood by the enhanced biodegradation and physiochemical removal process. © 2014 Society of Chemical Industry.
Xia P.,Shandong Product Quality Supervision and Inspection Research Institute |
Lu C.,Jinan Huaiyin District Real Estate Development Corporation |
Zou H.,Shandong Product Quality Supervision and Inspection Research Institute |
Zhang S.,University of Jinan
Hecheng Shuzhi Ji Suliao/China Synthetic Resin and Plastics | Year: 2012
Poly(trifluoroethylmethacrylate) (PTFEMA) with definite structure and narrow relative molecular mass distribution was synthesized by emulsion atom transfer radical polymerization (ATRP) process. The catalyst, initiator, emulsifiers, etc. affected the emulsion polymerization of ATRP. The emulsion prepared with non-ionic emulsifier polyoxyethylene oleyl ether was pretty stable and contained merely small amount of the gel generated in the polymerization, and the resultant polymer's experimental relative molecular mass was substantially consistent with the theoretical value. The relative molecular mass of the polymer was increased and the polymerization rate was accelerated gradually with the rise in the amount of the emulsifier, catalyst and initiator. PTFEMA emulsion having relative molecular mass of 1.44, particle size of 105.0 nm, particle size distribution of 0.211 and gel mass fraction of 15% could be prepared through the emulsion ATRP, and the emulsion could be kept in storage stably for three months.
Fu F.,Shandong University |
Tian L.-G.,Shandong Product Quality Supervision and Inspection Research Institute |
Tao J.-B.,Zhejiang Quality Inspection Institute of Science |
Cheng Y.-F.,Shandong Product Quality Supervision and Inspection Research Institute |
And 2 more authors.
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2013
Four fresh-water cultured pearls with different colors were measured and observed by Raman spectroscopy and high resolution scanning electron microscopy. The results showed that the morphologies of the exterior surface and fracture profile for the four pearls showed different characteristics. The surface of white and yellow pearls presents trim growth steps, but the growth steps of violet and purple pearls are disorder. Especially for the purple pearl, not only the growth steps are irregular, but also the surface owns more bunching steps and defects than others. As for the fracture surface observation, we found that the aragonite platelets thickness of white and yellow pearls was about 200-400 nm wheareas the aragonite lamina of violet and purple pearls ranked more densely and the thickness was about 100-300 nm. After etching by EDTA, it was discovered that there is organic matrix left between the lamina. The violet pearl was the easiest one to be etched by EDTA, and the purple pearl was the most difficult one, so it can be concluded that the purple pearl was very dense. That's why the purple pearl owns the best luster in the situation of bad exterior surface.
Zhang C.,Shandong University |
Gao C.,Shandong University |
Gao F.,Shandong University |
Wang J.,Shandong University |
And 3 more authors.
Petroleum Science | Year: 2014
A bipolymer maleic anhydride-methyl acrylate (MAMA) was synthesized from maleic anhydride and methyl acrylate based on molecular design. MAMA further reacted with oleylamine or octadecyl alcohol to generate two comb polymers called Oleamide-MAMA (NMAMA) and Octadecanol-MAMA (OMAMA), respectively. The structure of both the polymers was confirmed by their infrared spectral analysis (IR), gel permeation chromatography analysis (GPC) and differential scanning calorimeter (DSC). Moreover, the pour point depressing (PPD) properties of these comb polymers were examined experimentally. Experimental results showed that besides the molecular weight and concentration of the polymers, the length of side chains and the number of functional groups also had great influence on the pour point depressing performance. The π bonds and hydrogen bonds between depressants were the key factors for improving the pour point depressing properties. These results suggest that both OMAMA and NMAMA are potential pour point depressants for industry. © 2014 China University of Petroleum (Beijing) and Springer-Verlag Berlin Heidelberg.
Han P.,Qingdao University |
Gu Z.,Qingdao University |
Yu Y.,Shandong Product Quality Supervision and Inspection Research Institute |
Li P.Y.,Qingdao University |
Song G.J.,Qingdao University
Advanced Materials Research | Year: 2014
The EPDM/PP/OMMT nanocomposites were prepared with three different types of OMMT by melt extrusion method. The microstructure and mechanical properties of the nanocomposites were investigated. The intercalated structures of the nanocomposites were confirmed by transmission electron microscopy (TEM). The mechanical results showed that the OMMT (FMR242#) has the best reinforcement. When the content of OMMT was lower than 4wt. %, the mechanical properties of the nanocomposites improved greatly with the increase of the OMMT content. © (2014) Trans Tech Publications, Switzerland.