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Search Results: 1 - 10 of 42681 matches for " Xu Demin "
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Comparative analgesic effect of Ligusticum chuanxiong pieces and its products in mice
GAO Demin,XU Lingchuan
Pharmacognosy Magazine , 2010,
Abstract: The present study was undertaken with the objective of finding out the comparative analgesic effect of Ligusticum chuanxiong (LC) pieces decoction, LC formula granule decoction, liquored LC pieces decoction and liquored LC formula granule decoction. The analgesic effects were analyzed using the hot plate and acetic-induced writhing test in mice, and antidysmenorrheic effect was observed with primary dysmenorrhea model. The results showed that four kinds of LC decoction had definite effect in delaying incubation period and decreasing the writhing frequency within 30 min. They also effectively relieved dysmenorrhea. Moreover, liquored LC had better analgesic effect than crude LC in four decoctions.
Successful treatment for acute aortic dissection in pregnancy---bentall procedure concomitant with cesarean section
Changfa Guo, Demin Xu, Chunsheng Wang
Journal of Cardiothoracic Surgery , 2011, DOI: 10.1186/1749-8090-6-139
Abstract: Acute aortic type A dissection in pregnancy is rare, however, of high risk for both the mother and the fetus. Concomitant diseases of Marfan and bicuspid aortic valve disease (BAVD) are of special interest. From Jan 2001 to April 2008, we had two cases of acute aortic dissection in pregnancy (one BAVD patient, and the other Marfan patient), 1.38% (2/145) in all acute aortic type A dissection cases.Case I. A 33-year-old Marfan woman, who had had a normal previous pregnancy, was referred because of the acute chest pain with back irradiation. She was at the 28 weeks' pregnancy this time. Echocardiography revealed moderate-severe aortic regurgitation, a dilated aortic root measuring 5.2 cm in diameter, and an acute aortic dissection involving the ascending aorta and the aortic arch, which was also verified by a computed tomography arteriogram (Figure 1-A, B).Case II. A 30-year-old woman at 32 weeks of gestation was admitted because of the acute onset of severe chest pain and dyspnea. Her chest x-ray revealed an enlarged heart shadow and widening of the mediastinum. Echocardiography revealed BAVD (Figure 2-A) with moderate aortic stenosis and regurgitation, a dilated aortic root measuring 4.6 cm in diameter, and an acute aortic dissection involving the ascending aorta, which was also verified by a computed tomography arteriogram (Figure 2-B).These two patients had a negative history of vascular events, high blood pressure, and previous vascular surgery. Under general anesthesia, the cardiopulmonary bypass was built by draining from right atrium and perfusion into the femoral artery or axillary artery. Cesarean section was performed immediately followed by Bentall procedure. After 24 hours of a regular intensive care unit (ICU) postoperative period, the patients were transferred to the ward and then discharged on the 7th postoperative day.Aortic dissection is rare in young woman, but when it does occur, it is often associated with pregnancy of highest incidence in the thi
ON THE HYDROGEN STORING PROPERTY OF Ti SYSTEM ALLOYS

LI Yufeng,XU Demin,CHEN Yucai,

金属学报 , 1983,
Abstract:
The effect of co-catalysts on the morphology of isotactic polypropene prepared using metallocene catalyst
Mingge Zhang,Demin Xu,Han Hong,Cunyue Guo,Youliang Hu
Chinese Science Bulletin , 2002, DOI: 10.1360/02tb9182
Abstract: SiO2/rac-Me2Si[2-Me-4-Naph-Ind]2ZrCl2 was prepared and different co-catalysts were used in bulk polymerization of propene. The morphology of polypropene could be controlled by altering the co-catalysts. The isotactic polypropene with good morphology and high bulk density were prepared. The formation mechanism of active centers was proposed, by which the effect of co-catalysts on the morphology of polypeopene was analyzed.
Fibroblast-Like Cells Differentiated from Adipose-Derived Mesenchymal Stem Cells for Vocal Fold Wound Healing
Rong Hu, Wei Ling, Wen Xu, Demin Han
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0092676
Abstract: Tissue engineering has revealed the potential to regenerate injured vocal folds, and identification of the most suitable seed cells has remained a hot topic of research. The aim of this study was to implant fibroblast-like cells differentiated from adipose-derived mesenchymal stem cells (ADSCs) in a canine acute vocal fold wound model. We then sought to characterize changes in the extracellular matrix (ECM) proteins of vocal fold lamina propria. For this purpose, ADSCs were induced to differentiate into fibroblasts under the regulation of connective tissue growth factor in vitro. Cell surface proteins were identified by immunofluorescence staining. Thirty vocal folds of 17 canines were injured by localized resection and injected with fibroblast-like cells (differentiated ADSCs, dADSCs), ADSCs or vocal fold fibroblasts (VFFs). The morphology of vocal folds was observed, and the characteristics of ECM protein components (collagen, elastin, hyaluronic acid, decorin and fibronectin) were evaluated by immunofluorescence staining from 15 days to 6 months following implantation. The results showed that in vitro, the dADSCs showed morphology and cell surface protein expression similar to those of VFFs. After implantation in vivo, the surfaces of the recipient vocal folds became almost smooth in the dADSCs and ADSCs groups at 6 months but remained slightly concave and stiff in the VFFs group. The elastin fluorescence intensity increased significantly and was maintained at a high level in the dADSCs group. The collagen fluorescence intensity increased slightly in the dADSCs and ADSCs groups, whereas it demonstrated a more irregular arrangement in the VFFs group. The fluorescence intensity of hyaluronic acid, decorin and fibronectin was similar between the three implanted groups. These results indicated that dADSCs may confer an advantage for vocal fold wound healing. Furthermore, dADSCs have the ability to secrete ECM components in vivo, particularly elastin, which may be beneficial for vocal fold vibration recovery.
Fracture and Damage Behaviors of Concrete in the Fractal Space  [PDF]
Heng Zhang, Demin Wei
Journal of Modern Physics (JMP) , 2010, DOI: 10.4236/jmp.2010.11006
Abstract: The fracture toughness, the driving force and the fracture energy for an infinite plate with a fractal crack are investigated in the fractal space in this work. The perimeter-area relation is adopted to derive the transforma-tion rule between damage variables in the fractal space and Euclidean space. A plasticity yield criterion is introduced and a damage variable tensor is decomposed into tensile and compressive components to describe the distinct behaviors in tension and compression. A plastic damage constitutive model for concrete in the Euclidean space is developed and generalized to fractal case according to the transformation rule of damage variables. Numerical calculations of the present model with and without fractal are conducted and compared with experimental data to verify the efficiency of this model and show the necessity of considering the fractal effect in the constitutive model of concrete. The structural response and mesh sensitivity of a notched unre-inforced concrete beam under 3-point bending test are theoretical studied and show good agreement with the experimental data.
Lldpe prepared byin situ polymerization using a dualfunctional catalytic system of Ti(On-Bu)4 /ALEt3-Et(Ind)2-ZrCl2/MAO
Liu Zhongyang,Xu Demin,Guo Cunyue,Wang Jun,He Dawei,Hu Youliang
Chinese Science Bulletin , 2001, DOI: 10.1007/BF02901130
Abstract: Linear low-density polyethylene (LLDPE) was prepared byin situ polymerization using a dual-functional catalytic system containing Et(Ind)2ZrCl2/MAO and Ti(OnBu)4/AlEt3 used as co-polymerization catalyst and dimerization catalyst, respectively. The catalytic system showed high activity and the polymer with low melting point, narrow molecular weight distribution (MWD) and low crystallinity was produced.
Preparation of long-branched polyethylene byin situ polymerization using late transition metal and metallocene catalysts
Liu Zhongyang,Guo Cunyue,Ma Zhi,Wang Jun,Xu Demin,He Dawei,Hu Youliang
Chinese Science Bulletin , 2001, DOI: 10.1007/BF02901131
Abstract: Anin situ polymerization method was investigated to prepare long-branched polyethylene (LBPE) with ethylene alone and a single cocatalyst, methylalumoxane (MAO), by using a dual functional catalytic system containing late transition metal oligomerization catalyst and metallocene copolymerization catalyst. The obtained longbranched polyethylene has the characteristics of low melting point, high activity and well-dispersed sequence distribution.
Multidimensional Wavelet Networks Based on a Tensor Product Structure
基于张量积结构的多维小波网络(英文)

WAN Jian,XU Demin,HE Yuyao,
万 建
,徐德民,贺昱曜

控制理论与应用 , 2002,
Abstract: Based on the wavelet frame theory, a novel wavelet network for function learning in multidimensional spaces is proposed to avoid the 'curse of dimensionality'. The main feature of the proposed wavelet network is to multiply the reconstruction of each dimension in the output layer instead of adding them as usual. Thus a multidimensional wavelet frame will be generated automatically for approximation, and function learning can be realized through online or off-line adjustment of corresponding weight coefficients. Design methods for one_dimensional wavelet networks can also be generalized straightforwardly to multidimensional cases by using the tensor product structure. In the experiments, the multidimensional wavelet network performs well.
The effect of co-catalysts on the morphology of isotactic polypropene prepared using metallocene catalyst

ZHANG Mingge,XU Demin,HONG Han,GUO Cunyue,HU Youliang,

科学通报(英文版) , 2002,
Abstract: SiO2/rac-Me2Si2-Me-4-Naph-Ind]2ZrCl2 was prepared and different co-catalysts were used in bulk polymerization of propene. The morphology of polypropene could be controlled by altering the co-catalysts. The isotactic polypropene with good morphology and high bulk density were prepared. The formation mechanism of active centers was proposed, by which the effect of co-catalysts on the morphology of polypeopene was analyzed.
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