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Search Results: 1 - 10 of 59019 matches for " Changwei Yang "
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Effect of upper contact line on sliding behavior of water droplet on superhydrophobic surface
ChangWei Yang,PengFei Hao,Feng He
Chinese Science Bulletin , 2009, DOI: 10.1007/s11434-009-0029-2
Abstract: With a low surface energy, high apparent contact angle(>150°) and low sliding angle(<5°), superhydrophobic surface has recently been attracting a great deal of attention. The true factor determining the sliding angle still remains unclear. In this paper, various superhydrophobic silicon surfaces with pillars are fabricated by photolithography and hydrophobized with octadecyltrichlorosilane (OTS). Relations between sliding angles and micro-structured surfaces are being investigated in detail with 10 mg water droplets in C-B state and mixed state. Experimental pictures and data show that the sliding angle is independent of pillar heights from 20 to 80 μm, increasing the space between pillars causes decrease in sliding angle, and increasing the side lengths of pillars causes increase in sliding angle. Moreover, the sliding angle is irrelevant to the state of interfacial contact area of water-solid and lower contact line. It is concluded that the sliding angle of water droplet on the micro-structured surface is merely determined by the upper contact line.
Effect of upper contact line on sliding behavior of water droplet on superhydrophobic surface

ChangWei Yang,PengFei Hao,Feng He,

科学通报(英文版) , 2009,
Abstract: With a low surface energy, high apparent contact angle(>150°) and low sliding angle(<5°), superhydrophobic surface has recently been attracting a great deal of attention. The true factor determining the sliding angle still remains unclear. In this paper, various superhydrophobic silicon surfaces with pillars are fabricated by photolithography and hydrophobized with octadecyltrichlorosilane (OTS). Relations between sliding angles and micro-structured surfaces are being investigated in detail with 10 mg water droplets in C-B state and mixed state. Experimental pictures and data show that the sliding angle is independent of pillar heights from 20 to 80 μm, increasing the space between pillars causes decrease in sliding angle, and increasing the side lengths of pillars causes increase in sliding angle. Moreover, the sliding angle is irrelevant to the state of interfacial contact area of water-solid and lower contact line. It is concluded that the sliding angle of water droplet on the micro-structured surface is merely determined by the upper contact line. Supported by the National Natural Science Foundation of China (Grant Nos. 10672089 and 10872106)
Therapeutic Angiogenesis of PLGA-Heparin Nanoparticle in Mouse Ischemic Limb
Lishan Lian,Feng Tang,Jing Yang,Changwei Liu,Yongjun Li
Journal of Nanomaterials , 2012, DOI: 10.1155/2012/193704
Abstract: Objective. To evaluate the possibility and efficacy of the nanoparticle encapsulating heparin as a novel delivery system to treat ischemic disease. Methods. Firstly, to synthesize the PLGA heparin and test the surface morphology, the average diameter, the loading efficiency, and the release time in vitro, then inject the PLGA heparin into mouse ischemic limbs to observe the perfusion recovery with LDPI at the time of postischemic 7, 14, 21, and 28 days, and, finally, test the expression of VEGF and HGF, the number of the neovessels and record the necrotic score of ischemic limbs. Results. The surface morphology of the PLGA heparin was smooth, the average diameter was 297 nm, the loading efficiency was 5.35%, and the release period maintained for 14 days. In animal experiment, the perfusion recovery, HGF expression level, and capillary density in PLGA-heparin group were significantly higher than that in control group, and this was consistent with less ischemic limb necrosis. Conclusion. Nanoparticle encapsulating heparin could be successful and efficient in ischemic disease. The therapeutic angiogenesis of PLGA heparin might be due to the prolongation of its biological effects with stimulating growth factor expression.
Successful Remove of a Metal Axletree Causing Penile Strangulation in a 19-Year-Old Male by Degloving Operation
Weidong Gan,Rong Yang,Changwei Ji,Huibo Lian,Hongqian Guo
Case Reports in Medicine , 2012, DOI: 10.1155/2012/532358
Abstract: Penile strangulation caused by foreign bodies mostly occurs in adolescents and adult males. When it happens, foreign bodies are often not easy to be removed. Penile strangulation is a rarely described urological emergency, especially in the adolescent population. This paper demonstrates the successful removal of a metal axletree causing penile strangulation in a 19-year-old male with the help of degloving operation.
Knockdown of Akt Sensitizes Osteosarcoma Cells to Apoptosis Induced by Cisplatin Treatment
Guoyou Zhang,Ming Li,Xiaodong Zhu,Yushu Bai,Changwei Yang
International Journal of Molecular Sciences , 2011, DOI: 10.3390/ijms12052994
Abstract: Akt plays an important role in the inhibition of apoptosis induced by chemotherapy and other stimuli. We therefore investigated if knockdown of Akt2 promoted drug-induced apoptosis in cultured osteosarcoma cells in vitro. SAOS-2 cells were transfected with Akt2 siRNA. The sensitivity of the transformed cell line to the chemotherapeutic drug cisplatin was assessed. Reduced expression of Akt2 did not directly inhibit the growth rate of the transfected cells; however, it significantly increased their sensitivity to cisplatin. Knockdown of Akt2, together with cisplatin treatment, promoted the expression of p53 up-regulated modulator of apoptosis (PUMA). It is possible that the augmentation of cisplatin cytotoxicity may be mediated by PUMA activation. The results of this study suggest that knockdown of Akt2 expression may have therapeutic applications in enhancing the efficacy of chemotherapy in patients with osteosarcoma.
Numerical Simulation of Emission Characteristics for Single-Cylinder Diesel Engine  [PDF]
Changwei Ding, Weijun Liu
Energy and Power Engineering (EPE) , 2016, DOI: 10.4236/epe.2016.82008
Abstract: First, the geometry model and the calculation mesh of single-cylinder direct injection diesel engine are built, using ESE module of the 3D simulation software AVL FIRE v2014 [1]. Then, by setting appropriate boundary condition, initial condition and calculating step length, and selecting spray, the burning emissions on model and on the basis of adjusting the parameters, a scientific and reasonable simulation platform is built. Emission characteristics of single-cylinder diesel engines in oxygen-enriched, oxygen-enriched + EGR (inlet adding CO2), and separately using EGR would be studied. It is concluded that EGR synergy oxygen-enriched combustion is beneficial to exhaust treatment and 21% CO2 + 23% oxygen content is the optimal matching to improve diesel engine exhaust emissions.
Effects of ion concentration and natural organic matter on arsenic(V) removal by nanofiltration under different transmembrane pressures
Yang Yu,Changwei Zhao,Yangui Wang,Weihong Fan,Zhaokun Luan,
Yang Yu
,Changwei Zhao,Yangui Wang,Weihong Fan,Zhaokun Luan

环境科学学报(英文版) , 2013,
Abstract: The removal of As(V) from synthetic water was studied using four different nanofiltration (NF) membranes (ESNA-1-K1, NF270, ESNA-1-LF, and HODRA-CORE). The influences of ion concentration, transmembrane pressure (TMP), and the presence of natural organic matter (humic acid, HA) on the arsenic removal efficiency and permeate flux were investigated. The arsenic rejection of ESNA-1-LF was higher than those of the other membranes in all experiments (>94%), and the HODRA-CORE membrane gave the lowest removal of arsenic (<47%). An increase in the ion concentration in the feed solution and addition of HA decreased the arsenic rejection of the HODRA-CORE membrane. However, both increasing of the ion concentration and addition of HA made the rejection increased for the other membranes (ESNA-1-K1, NF270, and ESNA-1-LF). With increasing TMP, for all four NF membranes, increases in both arsenic rejection and permeate flux were observed. The permeate fluxes of the four NF membranes decreased to some extent after addition of HA to the solutions for operating time of 6 hr.
Bases for representation rings of Lie groups and their maximal tori
Changwei Zhou
Mathematics , 2015,
Abstract: A Lie group is a group that is also a differentiable manifold, such that the group operation is continuous respect to the topological structure. To every Lie group we can associate its tangent space in the identity point as a vector space, which is its Lie algebra. Killing and Cartan completely classified simple Lie groups into seven types. Representation of a Lie group is a homomorphism from the Lie group to the automorphism group of a vector space. In general represenations of Lie group are determined by its Lie algebra and its the connected components. We may consider operations like direct sum and tensor product with respect to which the representations of G form a ring R(G). Assume the group is compact. For every Lie group we may find a maximal torus inside of it. By projecting the representation ring of the Lie group to the representation ring of its maximal torus, we may consider to express R(T) elements as sums of products of base elements with R(G) elements. In 1970s Pittie and Steinberg proved R(T) is a free module over R(G) using homological algebra methods without specifying the bases in each seven types. In this senior project I found an explicit basis for the representation ring of the maximal torus of Lie group SUn in terms of the represenation ring of the Lie group itself. I also did some computation with SO2n.
Associations between Body Mass and the Outcome of Surgery for Scoliosis in Chinese Adults
Ziqiang Chen,Honglei Yi,Ming Li,Chuanfeng Wang,Jingtao Zhang,Changwei Yang,Yingchuan Zhao,Yanghu Lu
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0021601
Abstract: In this study we intended to prove that being overweight has an unfavorable impact on the surgical treatment outcome of adult idiopathic scoliosis (AdIS).
The Protective Effect of Bcl-xl Overexpression against Oxidative Stress-Induced Vascular Endothelial Cell Injury and the Role of the Akt/eNOS Pathway
Leng Ni,Tianjia Li,Bao Liu,Xitao Song,Genhuan Yang,Linfang Wang,Shiying Miao,Changwei Liu
International Journal of Molecular Sciences , 2013, DOI: 10.3390/ijms141122149
Abstract: Restenosis after intraluminal or open vascular reconstruction remains an important clinical problem. Vascular endothelial cell (EC) injury induced by oxidative stress plays an important role in the development of intimal hyperplasia. In this study, we sought to evaluate the protective effects of Bcl-xl overexpression in vitro on oxidative stress-induced EC injury and the role of the Akt/endothelial nitric oxide synthase (eNOS) pathway. Human umbilical vein endothelial cells (HUVECs) exposed to hydrogen peroxide (H 2O 2, 0.5 mM) were used as the experimental oxidative stress model. The Bcl-xl gene was transferred into HUVECs through recombinant adenovirus vector pAdxsi-GFP- Bcl-xl before oxidative treatment. Cell apoptosis was evaluated by Annexin V/propidium iodide and Hoechst staining, caspase-7 and PARP cleavage. Cell viability was assessed using the cell counting kit-8 assay, proliferating cell nuclear antigen (PCNA) immunocytochemical detection and the scratching assay. Expressions of Akt, phospho-Akt and eNOS were detected by Western blotting. Our results showed that H 2O 2 induced apoptosis and decreased the cell viability of HUVECs. Bcl-xl overexpression significantly protected cells from H 2O 2-induced cell damage and apoptosis and maintained the cell function. Furthermore, the level of phospho-Akt and eNOS protein expression was significantly elevated when pretreated with Bcl-xl gene transferring. These findings suggest that Bcl-xl overexpression exerts an anti-apoptotic and protective effect on EC function. The Akt/eNOS signaling pathway is probably involved in these processes.
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