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Search Results: 1 - 10 of 10653 matches for " DU Xingwen "
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Dynamic Viscoelasticity of Polyester/Rubber Composites under Cyclic Loading
Yuyan LIU,Zhenhui TIAN,Zhimin XIE,Xingwen DU,
Yuyan LUY
,Zhenhui TIAN,Zhimin XIE and Xingwen DU Harbin Institute of Technology,Harbin,China

材料科学技术学报 , 2005,
Abstract: This paper focuses on the influence of dynamic viscoelasticity and surface temperature on the fatigue mechanism and fatigue lifetime of polyester/rubber composites. Rubber composites show significant viscoelasticity during fatigue process. The variations of dynamic elastic modulus, mechanical loss angle, loss energy per cycle exhibit different trend in fatigue initial stage and final stage. Due to high viscoelasticity high heat generation occurs under cyclic loading, which leads to a high surface temperature. It is found that the variation of specimen surface temperaturedepends strongly on cycling frequency and stress amplitude. SEM (scanning electron microscopy) observation and static residual stiffness studies reveal that the surface temperature affects fracture morphology and fatigue lifetime of rubber composites strongly because of heat aging.
Fatigue Damage Accumulation of Steel/rubber Composite
Zhenhui TIAN,Huifeng TAN,Xingwen DU,
Zhenhui TIAN
,Huifeng TAN and Xingwen DU Center for Composite Materials,Harbin Institute of Technology,Harbin,China

材料科学技术学报 , 2006,
Abstract: The fatigue damage accumulation of ±20°] laminated steel cord reinforced rubber composite under T-T loading was studied. Results indicate that the increase in the cyclic maximum strain exhibits three-stage tendency in the process of fatigue. The macroscopic fatigue damage initiates from the ends of steel cords in the form of cylindrical crack. Damage propagates along with the increase in crack numbers, the cord/matrix interface debonding and the growth of interply cracks. By using the dynamic creep as parameter, a linear fatigue damage accumulation model was established. This model can be used under dual loading conditions to estimate the residual fatigue life of the specimen.
The Effect of Ultrasonic Waves on Metal Mechanical Behavior

ZHENG Jinxin,WAN Zhimin,DU Xingwen,CHENG Jin,

实验力学 , 1998,
Abstract: The effect of ultrasonic waves on the mechanical properties of metal materials in investigated experimentally and theoretically. A new test system is developed. The tests on purple copper and low carbon steel specimens show that such material parameters as yielding stress, stiffening rate and elongation rate are all reduced due to the action of ultrasonic waves. The constitutive equations for metal materials under the action of ultrasonic waves are supposedly presented on the basis of theoretical analysis and test data.
An Experimental Study on the Progressive Damage of Fiber Laminated Cylindrical Shells Under Axial Compression

ZHENG Jinxin,YU Zengxin,WAN Zhimin,DU Xingwen,

实验力学 , 1999,
Abstract: The broken process of fiber composite laminated cylindrical shells under axial loading is investigated experimentally. It is found that the broken mode of specimens changes with the fiber angle of composites. Some problems involving fracture toughness and energy absorption of composites are discussed.

WANG Changguo,DU Xingwen,WAN Zhimin,

力学与实践 , 2006,
Abstract: The space inflatable structure is a new construction technology and is the main demanding object in the future space activities. The inflatable structure is mainly made up of membrane; therefore, the maintenance of the structural surface accuracy is one of the most important problems. Wrinkling is the unique characteristic of the flexible membranes, and the wrinkles degrade the surface accuracy and the structural performance, so, the study on wrinkles in membrane structures is desirable and essential. In this paper, a prediction model of wrinkles is proposed, based on the buckling theory, and the wrinkles, including the wrinkle amplitude, wrinkle wavelength and the critical compressive stress, in a rectangular membrane subjected to in-plane horizontal shearing loads are predicted using the method proposed in the present paper. The predicted results show good agreement with our recent experiments and the reported data.
Experimental Investigation of Folding Damage for the Rigidizable Carbon-Epoxy Composites
Youshan WANG,Zhimin XIE,Zhimin WAN,Xingwen DU,
Youshan WANG Zhimin XIE
,Zhimin WAN and Xingwen DU Center for Composite Materials,Harbin Institute of Technology,Harbin,China Analysis and Measurement Center,Harbin Institute of Technology,Harbin,China

材料科学技术学报 , 2005,
Abstract: This paper focused on the folding damage behavior of the space rigidizable materials in terms of 3-layer composite membranes. An experimental scheme was presented. The composite membranes were folded between the two plates for a short time, and then the unfolded composite membranes were compressively cured in an oven. By adjusting the displacement of one plate, the folding radius was changed. As expected, the strength and effective modulus of the cured composite membranes drop with decreasing the folding radius. When the strain controlled failure rule is applied to the composite membranes, a minimal folding radius can be reached, beyond which the membranes will keep intact. Furthermore, folding damage due to folding and unfolding processes was evaluated by a simplified model. Compared with the measured residual strength and effective modulus, calculated results have the same trend. A discrepancy is attributed to neglecting the effects of the transverse fibers and the matrix.
Water vapor transport over China and its relationship with drought and flood in Yangtze River Basin

JIANG Xingwen,LI Yueqing,WANG Xin,

地理学报 , 2009,
Abstract: The characteristics of water vapor transport (WVT) over China and its relationship with precipitation anomalies in the Yangtze River Basin (YRB) are analyzed by using the upper-air station data in China and ECMWF reanalysis data in summer from 1981 to 2002. The results indicate that the first mode of the vertically integrated WVT is significant whose spatial distribution presents water vapor convergence or divergence in the YRB. When the Western Pacific Subtropical High (WPSH) is strong and shifts southward and westward, the Indian Monsoon Low Pressure (IMLP) is weak, and the northern part of China stands behind the middle and high latitude trough, a large amount of water vapor from the Bay of Bengal (BOB), the South China Sea (SCS) and the western Pacific forms a strong and steady southwest WVT band and meets the strong cold water vapor from northern China in the YRB, thus it is likely to cause flood in the YRB. When WPSH is weak and shifts northward and eastward, IMLP is strong, and there is nearly straight west wind over the middle and high latitude, it is unfavorable for oceanic vapor extending to China and no steady and strong southwest WVT exists in the region south of the YRB. Meanwhile, the cold air from northern China is weak and can hardly be transported to the YRB. This brings on no obvious water vapor convergence, and then less precipitation in the YRB.
Sinusoidal phase modulating interferometer for real-time surface profile measurement
He Guotian,Jiang Helun,Tan Xingwen
Optica Applicata , 2008,
Abstract: The optical interferometry for the surface profile measurement is high accuracy, non-contact, and has a wide application in industry and scientific research. In this paper, a sinusoidal phase modulating (SPM) interferometer to realize real-time surface profile measurement is proposed, and its measuring principle is analyzed theoretically. In the SPM interferometer, the interference signal is detected by a high speed image sensor based on a low-speed CCD and a signal processing circuit is used to obtain the phase of each point on the surface. Therefore, the surface profile can be measured real time. The experiments measuring the surface profile of a wedge-shaped optical flat show that the measurement time of the SPM interferometer is less than 10 ms, the repetitive measurement accuracy is 5.2 nm. The experimental results confirm the validity of the SPM interferometer, and the merits of the interferometer is simple structure, high measurement accuracy.
The comparison of the efficacy of swine FMD vaccine emulsified with oil adjuvant of ISA 201 VG or ISA 206 VG  [PDF]
Dong Li, Chunxue Zhou, Daliang She, Pinghua Li, Pu Sun, Xingwen Bai, Yingli Chen, Baoxia Xie, Zaixin Liu
Journal of Biosciences and Medicines (JBM) , 2013, DOI: 10.4236/jbm.2013.13005

The Seppic Company developed a new adjuvant Montanide ISA 201 VG, the upgraded version of Montanide ISA 206 VG, which keep the advantage and added some chemical components on the basis of ISA 206 to improve the cellular responses. The aim of the study is to compare the efficacy of swine FMD (foot-and-mouth) vaccine emulsified with oil adjuvant of ISA 201 or ISA 206 respectively. The pigs were vaccinated with FMD vaccine emulsified with inactive FMD type O antigen and adjuvant ISA 201 or ISA 206 respectively, according to 2.0 ml (1/1 dose), 0.67 ml (1/3 dose), 0.22 ml (1/9 dose) to calculate their PD50. The sera were collected from the vaccination of the day 0, 3, 7, 14, 21, 28 and the ELISA FMD type O antibody were detected. Furthermore, the PD50 were calculated after the pigs were challenged with virulent FMDV type O on 28 days post vaccination. The ELISA antibody titers of 201vaccine were significantly higher than that of 206 (except the third time). The fifty percent of protection dose (PD50) of 201 vaccine (PD50 = 15.59) was higher than that of 206 vaccine (PD50 = 10.05). The above data showed that the efficacy of the FMD vaccine emulsified with ISA 201 was better than which with ISA 206.

Gene expression profiling in a mouse model of infantile neuronal ceroid lipofuscinosis reveals upregulation of immediate early genes and mediators of the inflammatory response
Xingwen Qiao, Jui-Yun Lu, Sandra L Hofmann
BMC Neuroscience , 2007, DOI: 10.1186/1471-2202-8-95
Abstract: A total of 267 genes were significantly (approximately 2-fold) up- or downregulated over the course of the disease. Immediate early genes (Arc, Cyr61, c-fos, jun-b, btg2, NR4A1) were among the first genes upregulated during the presymptomatic period whereas immune response genes dominated at later time points. Chemokine ligands and protease inhibitors were among the most transcriptionally responsive genes. Neuronal survival factors (IGF-1 and CNTF) and a negative regulator of neuronal apoptosis (DAP kinase-1) were upregulated late in the course of the disease. Few genes were downregulated; these included the α2 subunit of the GABA-A receptor, a component of cortical and hippocampal neurons, and Hes5, a transcription factor important in neuronal differentiation.A molecular description of gene expression changes occurring in the brain throughout the course of neuronal ceroid lipofuscinosis suggests distinct phases of disease progression, provides clues to potential markers of disease activity, and points to new targets for therapy.An unusual group of lysosomal storage disorders, the neuronal ceroid lipofuscinoses, are characterized by retinal and cortical neurodegeneration with scant autofluorescent storage material that accumulates in the brain and peripheral tissues (reviewed in [1]). Distinct subsets of NCL are recognized based on characteristic appearance by electron microscopy that include granular osmiophilic deposits and/or various membrane profiles (curvilinear, fingerprint, and rectilinear) [2]. Autosomal recessive mutations in at least seven different genes are responsible for these disorders [3], and while the function of only a few is known, each appears to participate in some aspect of endo/lysosomal function [4]. The CLN1 (ceroid lipofuscinosis, neuronal-1) gene encodes a soluble lysosomal palmitoyl-protein thioesterase (PPT1) that functions to remove fatty acids (usually palmitate) from modified cysteine residues in proteins [5,6]. A growing number of s
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