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Search Results: 1 - 10 of 33101 matches for " Liye Feng "
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Synthesis of SnO2/TiO2 nanocomposite photocatalysts by supercritical fluid combination technology
Jingchang Zhang,Liye Feng,Jia Wei,Xuehua Guo,Weiliang Cao
Chinese Science Bulletin , 2006, DOI: 10.1007/s11434-006-2083-3
Abstract: SnO2/TiO2 nanocomposite photocatalysts were prepared from TiCl4 and SnCl4·5H2O by supercritical fluid combination technique (SCFCT). This novel SCFCT is a combination of supercritical fluid drying method and sol-gel method. The XRD, TEM and FTIR results show that a new kind of active particle (Ti, Sn)O2 has formed and there is no sign of SnO2 crystals observed in the range of the doping concentration studied. The samples’ photocatalytic activity was evaluated by the degradation of acrylic acid. The results indicate that the SnO2/TiO2 nanocomposite photocatalysts prepared through SCFCT show significant improvement in catalytic activity as compared to pure TiO2 or SnO2/TiO2 catalysts prepared by traditional drying (TD). The effect of H2O2 (0.167 v%) on the photodegradation was also investigated. After the addition of H2O2, the chemical oxygen demand (COD) of acrylic acid, which had been treated with (15.1 mol%) SnO2/TiO2 nanocomposite photocatalysts for 3 h, was reduced from 400–500 to 20 mg/L.
Second generation YBCO coated conductors: A review
Yanwei Ma,Liye Xiao
Chinese Science Bulletin , 2004, DOI: 10.1007/BF03183707
Abstract: The advance in first generation Bi-2223 HTS wire has enabled the demonstration of superconducting power cables, magnetic energy-storage devices, transformers, fault current limiters and motors. However, the low irreversibility field (H*) prevents application of Bi-2223 at 77 K in any significant field. Worldwide activities are therefore, focused on developing a second-generation HTS technology based on YBCO, for whichH* (77 K) ~ 7 T. In this paper, we discuss the status and commercial prospects of second generation HTS wire technologies. In addition, we review the recent results and discuss the prospects of future applications.
A Compact Approximate Solution to the Kondo Problem
Gerd Bergmann,Liye Zhang
Physics , 2007, DOI: 10.1103/PhysRevB.76.064401
Abstract: A compact approximate groundstate of the Kondo problem is introduced. It consists of four Slater states. The spin up and down states of the localized d-impurity are paired with two localized s-electron states of opposite spin. All the remaining s-electron states are rearranged forming two new optimal orthonormal bases. Through a rotation in Hilbert space the two localized states (and the rest of the bases) are optimized by minimizing the energy expectation value. The ground-state energy E and the singlet-triplet excitation energy dE are calculated numerically. Although the two energies can differ by a factor of 1000, they are obtained simultaneously. The singlet-triplet excitation energy dE is proportional to exp[-1/2Jg] and quite close to the Kondo temperature k_BT_K. The cases for anti-ferromagnetic (J>0) and ferromagnetic (J<0) coupling are investigated.
The Helicity Amplitude for $1/2$ and $3/2^+$ Baryon in the Pseudo-Meson Photoproduction in the Quark Model
Leihua Liu,Liye Xiao
Physics , 2015,
Abstract: We derive the separate helicity amplitudes involving the partial wave analysis in the process of pseudo-scalar meson photon productions with $J^P=3/2^+$, which is independent on model. According to parity, the general amplitude in the case of $J^P=1/2^-$ is given out. We prove this general amplitude is corresponding to the situation of $\lambda=-1$ as adopting the circular polarization. Finally, the formulas of scattering amplitudes involving the photon-meson production with $J^P=3/2^+$ are obtained from the chiral quark model.
Taichi Softball as a Novel Chinese Health-Promoting Exercise for Physical Health: A Systematic Review and Meta-Analysis  [PDF]
Liye Zou, Huiru Wang, Mark Zhang, Zhongjun Xiao, Qun Fang
Open Journal of Preventive Medicine (OJPM) , 2017, DOI: 10.4236/ojpm.2017.72002
Abstract: Background: Taichi softball was voted as one of the most popular health-promoting exercises in the category of ball games, which is attributed to that Taichi softball is not only beneficial for lower extremity-related physical health (e.g., balance, leg strength, and flexibility), but can also develop manipulative skill and hand-eye coordination (eating, bathing, dressing, bathing required manipulative skills, grips movement and strength). However, the positive effects of Taichi softball on physical health have rarely been investigated. Therefore, the purpose of this systematic review was to evaluate the effect of Taichi softball on physical health. Methods: Five electronic databases were used to conduct literature searches. Two review authors independently extracted data in a standardized manner. The methodological quality of studies included was independently evaluated according to the Cochrane Collaboration’s for Assessing Risk of Bias from the Cochrane Handbook for Systematic Review Interventions. The standard mean difference (SMD) and 95% confidence interval (CI) using more conservative random effects model were calculated. Results: The sample size of 411 participants ranged from 32 to 150 in the RCTs, along with a wide age range from 18 to 75. The length of Taichi softball intervention peri-ods in the eligible studies ranged from 12 weeks to 12 months. The participants in the studies consisted of healthy college students, patients with Type 2 diabe-tes, and older adults from community centers. Six randomized controlled trials were used for the meta-analysis. The aggregated results are in favor of Taichi softball on improving physical health in participants with healthy status and Type 2 Diabetes Mellitus. The improvement on the primary components of the physical health consisted of handgrip strength (SMD, -0.6, 95% CI -0.84 to 0.36, p < 0.00001), trunk flexibility (SMD, -0.4, 95% CI -0.74 to -0.05, p = 0.03), static (SMD, -0.73, 95% CI -0.94 to -0.51, p < 0.00001) and dynamic balance (SMD, -0.68, 95% CI -1.2 to -0.17, p = 0.009). Conclusions: Taichi softball appears to be beneficial for improving physical health (hand strength, physical balance, flexibility, aerobic endurance, resting heart rate, diastolic and systolic pressures) among healthy adults and patients with Type 2 Diabetes. However, because of the low methodological quality of assessment, ill-designed experimental designs, and small study size, a definite conclusion of Taichi softball improving physical health can be confirmed along with high-quality studies with long follow-up.
MANAGEMENT AND UTILIZATION OF THE WIND-DRIFT SAND LAND
风沙化土地的整治与利用

Shao Liye,
邵立业

自然资源学报 , 1990,
Abstract: The wind-drift sand process refers to the process by which the wind-drift sand activities occur on the ground surface and the wind-drift sand geomorphic landscapes form in the areas outside the arid and semi-arid zones. It is a branch research following the research of desertification. The wind-drift sand land is both an available land resource and a source of pollutants of environmental pollution. For the wind-drift sand land, it ought to adopt the measures of management and effective utilization simultaneously Through investigation and demonstration, it has been found that the construction of biological engineering and the development of eco-ag-riculture are the best ways to manage and utilize the wind-drift sand land.
Discussions on the Architecture and Operation Mode of Future Power Grids
Liye Xiao,Liangzhen Lin,Yi Liu
Energies , 2011, DOI: 10.3390/en4071025
Abstract: The new energy revolution, of which the primary energy will be based on renewable energy sources and the terminal energy will be based on electric power, will have a revolutionary impact on the future power grids. In order to develop the corresponding power grid for the future energy system, first of all, the architecture and mode of operation of the future power grid must be investigated. In this paper, we suggest that the DC—dominant operation mode for transmission system, distribution network and distributed power system should be developed, and a MP-MC dominated transmission architecture (multiple powers to multiple consumers) and the two-way power exchange control (TPEC) should be employed to build “wide-area super virtual power plants” (WASVPPs) which cover all the major power plants in a wide range, allowing the consumers to obtain a stable and reliable supply of electricity from the “cloud powering” created by WASVPP and the distributed power system which is connected to the grid.
Application of high magnetic fields in advanced materials processing
Yanwei Ma,Liye Xiao,Luguang Yan
Chinese Science Bulletin , 2006, DOI: 10.1007/s11434-006-2218-6
Abstract: Recently, steady magnetic fields available from cryogen-free superconducting magnets open up new ways to process materials. In this paper, the main results obtained by using a high magnetic field to process several advanced materials are reviewed. These processed objects primarily include superconducting, magnetic, metallic and nanometer-scaled materials. It has been found that a high magnetic field can effectively align grains when fabricating the magnetic and non-magnetic materials and make inclusions migrate in a molten metal. The mechanism is discussed from the theoretical view-point of magnetization energy.
Classification of snow cover days in western China and comparison with satellite remote sensing data

LiYe He,DongLiang Li,Lian Chen,

寒旱区科学 , 2012,
Abstract:
Neutralizing antibody response in the patients with hand, foot and mouth disease to enterovirus 71 and its clinical implications
Chunfu Yang, Chaoyang Deng, Junfeng Wan, Liye Zhu, Qibin Leng
Virology Journal , 2011, DOI: 10.1186/1743-422x-8-306
Abstract: Historically, the outbreaks of HFMD (hand, foot and mouth disease) in European countries and the United States have been spontaneous and small in scale. Noticeably, there were also two large outbreaks with high mortality rates in Bulgaria (1975) [1] and Hungary (1978) [2]. In recent years numerous large outbreaks of HFMD have occurred in eastern and southeastern Asian countries and regions, including Malaysia [3], Singapore [4], Taiwan [5], Japan [6], South Korea [7], Vietnam [8] and mainland China [9]. HFMD has become an emerging disease in China since March 2008 [10]. Accumulating cases so far have reached 3.4 million, including nearly 1400 fatalities. It is worth mentioning that not only deaths have increased 156% over the last year, but the overall number of severe cases has also increased significantly. The noticeable difference of these outbreaks in China from other regions is that the circulating EV71 viruses are only from the C4 genotype [11], but the reasons for causing large outbreaks in China still remains largely unclear. Environmental, human genetic and immunological factors all have, most likely, contributed to it.In recent years, several EV71 vaccine candidates, including live-attenuated virus, inactivated whole virus, recombinant viral protein, virus-like particle and DNA vaccine, have been evaluated in animal studies [12-17]. The vaccine studies in animal models have demonstrated that neutralizing antibodies may play a critical role in protecting mice from the viral challenge [12,13,16]. EV71 vaccine clinical trials have been approved recently and will be soon carried out in China. Other than the target populations, it is difficult to predict what antibody titer will be considered as a protective level in the clinical trials. Probably the best way to discover this information is to study naturally-occurring EV71 infections in patients.Because the current outbreak in China began in March 2008 in the city of Fuyang, located in northwestern Anhui provi
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