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Effect of scramjet combustor configuration on the distribution of transverse injection kerosene
Pan Yu,Dai Junfei,Bao Heng 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.12
The effect of combustor configuration on the distribution of transverse injection kerosene was investigated in a direct-connected supersoniccombustor equipped with multi-cavities, at the inflow condition of Ma = 2.64. The combustor configuration included a single cavity,cavities in tandem and cavities in parallel. The distribution of kerosene injected upstream of a cavity was observed by high speedphotography. The experiments showed that the kerosene transverse jet shows strong turbulence characteristics. Only a small portion ofkerosene can be engulfed into the cavity, as the main portion is transported downstream in the core flow. Even with a high injection pressure,the kerosene jet from one side of the combustor cannot achieve a well distribution, since the kerosene cannot cross through the mainflow to reach the opposite side wall. Double cavities in tandem show a better performance in improving mixing and penetration for kerosenein the core flow, and the sequence of cavities seems have no effect on the injection. By increasing the fuel injection pressure, morekerosene is injected into the core flow, and less is engulfed into the cavity.
Fatty acid-binding protein 5 activates cyclooxygenase-2 and promotes hypoxic injury in LO2 cells
Pan Long,Pang Yihan,Xiao Heng,Deng Xin,Chen Qingsong 대한독성 유전단백체 학회 2022 Molecular & cellular toxicology Vol.18 No.1
Background Hepatic hypoxia always results in liver inflammation and dysfunction. Fatty acid-binding protein 5 (FABP5) has been reported as a hypoxia-inducible gene and a regulator of inflammatory reaction . Objective To evaluate the effects of FABP5 on hypoxic liver injury and its potential mechanisms. Results FABP5 was hypoxia-inducible expression in liver tissues and LO2 cells. The expression levels of IL6 and TNFα were upregulated with the increasing expression of FABP5 in LO2 cells. Downregulation of FABP5 expression decreased the expression levels of ALT, AST and increased cell viability of hypoxic LO2 cells. Downregulation of FABP5 expression inhibited the cyclooxygenase-2/prostaglandin E2 (COX-2/PGE2) pathway and decreased inflammatory reaction in hypoxic LO2 cells. Conclusions FABP5 was shown to activate COX-2/PGE2 pathway and promote hypoxic injury in LO2 cells. FABP5 may be a potential target for the treatment of hypoxic liver injury.
Chong‑pan Ma,Yang Zhang,Heng Zhang,Ai‑jun Gao,Yu Wang 한국섬유공학회 2023 Fibers and polymers Vol.24 No.10
Surface activation is an essential process in carbon fiber preparation for surface inertness of carbon fibers. In this study, X-ray photoelectron, Raman spectroscopies, dynamic contact angle, monofilament tensile strength and interfacial shear strength (IFSS) measurements were used to investigate the activation effects of NH4HCO3, NH4H2PO4, and NH4HSO4 electrolytes on carbon fiber surfaces under the same conductivity conditions. The results showed that the surface structures and properties of carbon fibers after treatment with different ammonium salts differed significantly. Oxidation by active oxygen [O] was stronger under acidic conditions, i.e., with NH4H2PO4 and NH4HSO4, than that under alkaline conditions, i.e., with NH4HCO3. However, when the acidity was too high, oxidation by active oxygen [O] was weakened by the effect of H+ concentration. The surface graphitization degree (R) of carbon fibers decreased slightly after treatment with the three ammonium salts because of the effects of active oxygen [O] and anionic etching or stripping. As the electrolyte acidity increased, the R decreased more significantly, and the monofilament tensile strength increased more significantly. The dynamic contact angle between the activated carbon fibers and deionized water after treatment with NH4H2PO4 was the lowest. The IFSS was the largest and was 52.3% higher than that before treatment.
Zhongxiang Pan,Heng Ma,Zhenyu Wu,Xiaohong Zhou 한국섬유공학회 2020 Fibers and polymers Vol.21 No.4
Transverse bending damage morphologies of carbon fiber composite tubes with different ply structures wereinvestigated by the micro-XCT characterization. Structural effects of the plain, twill and winding on the damage mechanismwere analyzed. The experimental results present fiber-resin cracking, interlayer delamination and fiber tows breakage withstructural deformation from the peak load to final catastrophic failure. Woven fabric plies in the plain and twill compositetubes cannot be effectively slipped because of their tight interlaced structures, which makes the load propagate along the warpand weft fiber tows, resulting in more fiber tows breakage under bending-induced stretching. There is no interlaced effect onthe failure mechanism for the winding tubes, resulting in a fact that the bending load can only be transferred from the fiberresinor the layer-to-layer interface, with more interlaminar slippage and obvious springback behaviors under in-plane shear. For investigating the interlaced effect on failure mechanism, plain and winding models under transverse bending wereestablished using continuous shell elements, and different constitutive description were used to simulate interlayer failure andintra-layer failure behaviors. By comparing the numerical results with the experimental ones, the influence of the fabricstructure on the failure behavior of the tube were analyzed.
Magnetite for phosphorus removal in low concentration phosphorus-contained water body
Xiang, Heng,Liu, Chaoxiang,Pan, Ruiling,Han, Yun,Cao, Jing Techno-Press 2014 Advances in environmental research Vol.3 No.2
Magnetite was chosen as a typical adsorbent to study its phosphate adsorption capacity in water body with low concentration of phosphorus (below $2mg\;PL^{-1}$). Magnetite was collected from Luoyang City, Henan Province, China. In this research, three factors have been studied to describe the adsorption of phosphate on magnetite, which was solution concentration (concentration ranging from 0.1 to $2.5mg\;PL^{-1}$), suspension pH (1 to 13) and temperature (ranging from $10^{\circ}C$ to $40^{\circ}C$). In addition, the modified samples had been characterized with XRD and FE-SEM image. The results show that iron ions contains in magnetite were the main factors of phosphorus removal. The behavior of phosphorus adsorption to substrates could be fitted to both Langmuir and Freundlich isothermal adsorption equations in the low concentration phosphorus water. The theoretical saturated adsorption quantity of magnetite is 0.158 mg/g. pH has great influence on the phosphorus removal of magnetite ore by adsorption. And pH of 3 can receive the best results. While temperature has little effect on it. Magnetite was greatly effective for phosphorus removal in the column experiments, which is a more practical reflection of phosphorous removal combing the adsorption isotherm model and the breakthrough curves. According to the analysis of heavy metals release, the release of heavy metals was very low, they didn't produce the secondary pollution. The mechanism of uptake phosphate is in virtue of chemisorption between phosphate and ferric ion released by magnetite oxidation. The combined investigation of the magnetite showed that it was better substrate for water body with low concentration of phosphorus.
Ju-Hua Wang,Xiu-Heng Xue,Jie Zhou,Cai-Yun Fan,Qian-Qian Xie,Pan Wang 대한기생충학열대의학회 2015 The Korean Journal of Parasitology Vol.53 No.3
Cryptosporidium andersoni ATP-binding cassette (CaABC) is an important membrane protein involved in substrate transport across the membrane. In this research, the nucleotide binding domain (NBD) of CaABC gene was amplified by PCR, and the eukaryotic expression vector of pEGFP-C1-CaNBD was reconstructed. Then, the recombinant plasmid of pEGFP-C1-CaNBD was transformed into the mouse intestinal epithelial cells (IECs) to study the iron transportation function of CaABC. The results indicated that NBD region of CaABC gene can significantly elevate the transport efficiency of Ca<SUP>2+</SUP>, Mg<SUP>2+</SUP>, K<SUP>+</SUP>, and HCO₃<SUP>-</SUP> in IECs (P<0.05). The significance of this study is to find the ATPase inhibitors for NBD region of CaABC gene and to inhibit ATP binding and nutrient transport of CaABC transporter. Thus, C. andersoni will be killed by inhibition of nutrient uptake. This will open up a new way for treatment of cryptosporidiosis.