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Search Results: 1 - 10 of 34393 matches for " Xingwei Zhou "
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Construction of wavelet bases with hexagonal symmetry
Wenchang Sun,Xingwei Zhou
Chinese Science Bulletin , 1999, DOI: 10.1007/BF02885020
Abstract: A new method of the construction of bidimensional wavelet bases is presented. An example of orthonormal bases of compactty supported bidimensional wavelets with hexagonal symmetry is given.
Sampling theorem for multiwavelet subspaces
Wenchang Sun,Xingwei Zhou
Chinese Science Bulletin , 1999, DOI: 10.1007/BF02885844
Abstract: Sampling theorem on multiwavelet subspaces is established. Necessary and sufficient conditions are obtained. The result covers the Shannon’s sampling theorem and the early results on the sampling theorem for wavelet subspaces.
A class of irregular wavelet frames
Xingwei Zhou,Yongquan Li
Chinese Science Bulletin , 1997, DOI: 10.1007/BF02883048
Abstract:
Numerical Investigation on the Aerodynamic Characteristics of a Forward Flight Flapping Airfoil with Nonsymmetrical Plunging Motion
Zhang Xingwei,Zhou Chaoying
Information Technology Journal , 2011,
Abstract: The aim of this study is to investigate the influence of nonsymmetrical up-down plunging motion of a forward flight airfoil on its aerodynamic characteristics. Numerical simulations are carried out by using the finite volume method to solve the two-dimensional time-dependent incompressible Navier-Stokes equations. To study the influence of an oblique attack angle, the attack angle is selected from -5 to 10 with an increase of 2.5. For each attack angle, seven nonsymmetrical plunging models are examined. The vortex patterns in the wake of the airfoil corresponding to each case are also analyzed and two types of vortex formation are observed where one has two vortices shed in each plunging cycle and the other has four. The vortex pattern in the wake and the moving direction of the vortices are found to be predominantly determined by the plunging motion with different duration time ratio if the frequency and the amplitude of the plunging motion are fixed. It is found that the nonsymmetrical plunging motion alters the time of flow separation at the leading edge compared to the symmetrical one, which may result in higher propulsions. The moving direction of the vortices is also effected by the attack angle of the wing and the variation in the moving direction of the vortices can cause significant changes in propulsion and lift. The present work confirms that both the propulsive and lifting performance of an airfoil can be improved by a nonsymmetrical plunging motion.
Construction of wavelet bases with hexagonal symmetry

Wenchang Sun,Xingwei Zhou,

科学通报(英文版) , 1999,
Abstract: A new method of the construction of bidimensional wavelet bases is presented. An example of orthonormal bases of compactty supported bidimensional wavelets with hexagonal symmetry is given.
Clinical Study of Sulfotanshinone Sodium Injection in Treating Non-Ischemic Retinal Vein Occlusion  [PDF]
Bingwen Lu, Xingwei Wu
Chinese Medicine (CM) , 2015, DOI: 10.4236/cm.2015.62009
Abstract: Objectives: To study the effect of sulfotanshinone sodium (SS) injection in the treatment of non-ischemic retinal vein occlusion (RVO). Methods: Sixty-two RVO patients treated in our hospital between Jan. 2013 and Oct. 2014 were randomly divided into Control Group (30 patients; Bendazol tablets) and Treatment Group (32 patients, Bendazol tablets + SS injections), each with a follow-up period of 6 months. Statistical analysis was then performed on changes in visual acuity, central retinal thickness (CRT) and retinal circulation time (RCT) before and after the treatment. Results: After treatment, both Control Group and Treatment Group witnessed an improvement on visual acuity (Control Group: t = 2.103, p = 0.044; Treatment Group: t = 8.021, p = 0.000). Visual acuity could be greatly improved in Treatment Group when compared with Control Group, with significant differences (p < 0.01). Macular edema could be greatly relieved in Treatment Group measured by CRT (t = 2.571, p = 0.007) while the difference was of no statistical significance in Control Group (t = 1.016, p = 0.070). RCT were remarkably shortened in both groups (Control Group: t = 43.83, p = 0.000; Treatment Group: t = 27.34, p = 0.000), and when compared with Control group, the changes in Treatment Group were more significant (p < 0.05). Conclusion: SS injection could effectively improve the therapeutic effect in patients with non-ischemic retinal vein occlusion.
The Protective Effect of Compound Danshen Dripping Pills on Oxidative Stress after Retinal Ischemia/Reperfusion Injury in Rats  [PDF]
Bingwen Lu, Xingwei Wu
Chinese Medicine (CM) , 2015, DOI: 10.4236/cm.2015.62010
Abstract: Objective: To investigate the effect of Compound Danshen Dripping Pills (CDDP) on oxidative stress after ischemia/reperfusion (I/R) injury in the rat retina. Methods: Adult male SD rats were randomly divided into 3 groups: sham (group A), I/R (group B), and I/R plus CDDP (group C). Retinal ischemia/reperfusion injury (RIRI) was introduced by increasing the intraocular pressure (IOP) to 110 mmHg for 60 min via cannulation into the anterior chamber. Right after the insult, CDDP was administered intragastrically (450 mg/kg/d) for 7 days. The levels of malondialdehyde (MDA), the activities of superoxide dismutase (SOD), glutathione peroxidase (GSH-Px), and catalase (CAT) in the retinal tissues were determined on d1 and d7 after the ischemic insult. Results: Following ischemia, the MDA levels in group B and group C were significantly higher than those in group A (p < 0.01). CDDP significantly lowered MDA levels in group C when compared with group B (p < 0.01). The activities of SOD, GSH-Px and CAT were higher in group A than in group B and group C (p < 0.01). CDDP could increase the activities of SOD, GSH-Px and CAT remarkably in group C when compared with group B (p < 0.01). Conclusion: CDDP can protect the retina from I/R injury through reducing oxidative stress, and thus may be a promising method for the treatment of ischemic retinal disorders.
A Long-Term Study of Efficacy of Patients with Macular Edema Secondary to BRVO Treated with Ranibizumab Combined with Compound Salvia  [PDF]
Yalan Feng, Xingwei Wu
Chinese Medicine (CM) , 2015, DOI: 10.4236/cm.2015.63018
Abstract: Purpose: To study the long-term efficacy of intravitreal ranibizumab injection combined with in-travenous compound salvia injection drip in the treatment of patients with macular edema sec-ondary to branch retinal vein occlusion(BRVO). Methods: Sixty-five patients of branch retinal vein occlusion with macular edema were analyzed retrospectively. Thirty-seven patients in the treat-ment group were treated with ranibizumab injection combined with intravenous compound salvia injection drip, twenty-eight patients in the control group were treated with ranibizumab injection only. All patients were recorded and analyzed changes of clinical efficacy after 3 months, 6 months after a course of treatment of 6 months. Results: During 3 months after 6 months’ treatment, there were 5 patients having recurrence in the treatment group, while there were 9 in control group, the rate of recurrence between the two groups had significant difference (P < 0.05); during 3 - 6 months after a course of treatment, there were 2 patients having recurrence in the treatment group, while there were 4 in control group, the rate of recurrence between the two groups had significant difference (P < 0.05); however, the treatment group’s BCVA was better than control group, and the difference between the two groups had significance (P < 0.05). Conclusion: Ranibizumab injection combined with intravenous compound salvia injection drip could effectively reduce the impossibility of recurrence, improve the visual activity and bring better therapeutic efficacy in patients with macular edema secondary to branch retinal vein occlusion. The treatment showed great potential in the clinical use.
Retinal Functional Changes Measured by Microperimetry after Intravitreal Ranibizumab Injection and Sulfotanshinone Sodium Injection for Macular Edema Secondary to Retinal Vein Occlusion  [PDF]
Bingwen Lu, Xingwei Wu
Chinese Medicine (CM) , 2015, DOI: 10.4236/cm.2015.63020
Abstract: Objectives: To study the visual field changes after intravitreal ranibizumab (IVR) injection and sulfotanshinone sodium (SS) injection for macular edema (ME) secondary to retinal vein occlusion (RVO), and discuss the value of microperimetry as a routine diagnostic test in the follow-up of RVO patients. Methods: This was a retrospective, interventional, case-series study. Twelve eyes of 12 RVO patients, including 6 eyes with central RVO (CRVO) and 6 eyes with branch RVO (BRVO) were included. The eyes were treated with IVR (0.5 mg) injections and SS injections (20 mg per day, one week consecutively in one month). The outcomes measured included best corrected visual acuity (BCVA), central retinal thickness (CRT), mean defect (MD), pattern standard deviation (PSD), macular light sensitivity of the central 16 points in CRVO group and the central 8 points in BRVO group before and after the treatment. Statistical analyses were then performed on the main outcome measures. Results: An improvement of BCVA was found in all patients after treatment with significant difference (t = 7.74, p < 0.01). CRT improved from (700.3 ± 184.9) μm before treatment to (235.3 ± 36.5 μm) after treatment (t = 8.24, p < 0.01). As for the results of visual field, MD improved significantly (t = 5.83, p < 0.01), whereas the changes of PSD showed no significant importance (t = 2.17, p > 0.05). All RVO patients had their macular light sensitivity of the involved part improved significantly (t = 5.03, p < 0.01). Both the macular light sensitivity of the central 16 points in the CRVO group and the macular light sensitivity of the central 8 points in the BRVO group improved with statistical importance (t = 3.78, p < 0.05; t = 5.38, p < 0.01). The Pearson’s correlation was calculated among BCVA, MD, macular light sensitivity and CRT. No obvious significance was found between CRT and BCVA outcomes, whereas MD and mean macular light sensitivity outcomes were closely related to BCVA results in the BRVO group and the latter showed a more intimate correlation. No similar correlation was found in RVO and CRVO group. Conclusion: IVR injection and SS injection together could effectively improve the therapeutic effect in RVO patients with ME. Microperimetry could be used as a routine diagnostic test and a possible valuable tool in the follow-up of patients with RVO, especially in BRVO.
The influence of bioleaching on dewaterability of municipal sewage sludge
生物沥浸处理对城市污泥脱水性能的影响研究

SONG Xingwei,ZHOU Lixiang,
宋兴伟
,周立祥

环境科学学报 , 2008,
Abstract: 通过摇瓶培养试验研究了生物沥浸处理对城市污泥离心脱水率、污泥过滤比阻、泥饼压缩系数等脱水性能的影响,并分析了生物沥漫过程中污泥Ph、Fe2 、Fe2 、污泥颗粒Zeta电位、粳粒粒径分布的变化.研究表明,以亚铁和硫作为复合能源物质时,污泥经过生物沥浸处理后,其离心脱水率可从原始污泥的60%提高到74.4%;污泥比阻从处理前的1.83×109 s2·g-1下降到0.39×109 s2·g-1,降低了79%,压缩系数也从原始污泥的0.98降低为0.58,明显好于其他处理,达到不加絮凝剂而可直接机械压滤脱水的性能要求.研究还表明,污泥生物沥浸处理后.随着Ph的下降,污泥颗粒Zeta电位趋于零以及污泥20~60μm粒径范围的颗粒含量明显减少,可能是污泥脱水性能改善的重要原因之一.可见,污泥生物沥浸处理是一种在去除重金属的同时能够改善污泥脱水性能的技术.
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