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Search Results: 1 - 10 of 23265 matches for " LiYe He "
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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:
Structural and Functional Changes in Subcortical Vascular Mild Cognitive Impairment: A Combined Voxel-Based Morphometry and Resting-State fMRI Study
Liye Yi, Jinhui Wang, Longfei Jia, Zhilian Zhao, Jie Lu, Kuncheng Li, Jianping Jia, Yong He, Chuanlu Jiang, Ying Han
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0044758
Abstract: The present study aimed to investigate changes in structural gray matter (GM) volume and functional amplitude of spontaneous low-frequency oscillations (LFO) and functional connectivity density in patients with subcortical vascular mild cognitive impairment (svMCI). Structural MRI and resting-sate functional MRI data were collected from 26 svMCI patients and 28 age- and gender-matched healthy controls. Structurally, widespread GM atrophy was found in the svMCI patients that resided primarily in frontal (e.g., the superior and middle frontal gyri and medial prefrontal cortex) and temporal (the superior and inferior temporal gyri) brain regions as well as several subcortical brain sites (e.g., the thalamus and the caudate). Functionally, svMCI-related changes were predominantly found in the default mode network (DMN). Compared with the healthy controls, the svMCI patients exhibited decreased LFO amplitudes in the anterior part of the DMN (e.g., the medial prefrontal cortex), whereas increased LFO amplitudes in the posterior part of the DMN (e.g., the posterior cingulate/precuneus). As for functional connectivity density, the DMN regions (e.g., the posterior cingulate/precuneus, the medial prefrontal cortex and the middle temporal gyrus) consistently exhibited decreased functional connectivity. Finally, the overall patterns of functional alterations in LFO amplitudes and functional connectivity density remained little changed after controlling for structural GM volume losses, which suggests that functional abnormalities can be only partly explained by morphological GM volume changes. Together, our results indicate that svMCI patients exhibit widespread abnormalities in both structural GM volume and functional intrinsic brain activity, which have important implications in understanding the pathophysiological mechanism of svMCI.
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.
苏云金芽胞杆菌cry1Ie新基因的克隆、表达与生物活性测定
Cloning, expression, and biological activity of a new cry1Ie gene from Bacillus thuringiensis strain

余宗兰,贺利业,龚莉,黄刚辉,李平,郑爱萍,Yu Zonglan,He Liye,Gong Li,Huang Ganghui,Li Ping,Zheng Aiping
- , 2016, DOI: 10.13802/j.cnki.zwbhxb.2016.02.004
Abstract: 为获得新的鳞翅目害虫杀虫基因,根据已知cry1I类基因编码区设计简并引物,采用直接克隆法,以苏云金芽胞杆菌(Bacillus thuringiensis,Bt)菌株BN23-5质粒DNA为模板进行扩增,并对得到的基因进行鉴定和分析。结果表明:克隆得到一个完整的cry1Ie基因,全长2160bp,由719个氨基酸组成,该氨基酸序列与已知的4种Cry1Ie蛋白不同,与Cry1Ie2和Cry1Ie3的氨基酸序列同源性最高,为95.4%,被国际Bt杀虫晶体蛋白基因命名委员会命名为Cry1Ie5(登录号为KJ710646)。将该基因插入表达载体pET-28a,转化大肠杆菌BL21(DE3),IPTG低温诱导成功表达,SDS-PAGE电泳验证其大小为81kD,与预测的分子量相符合。生物活性测定表明,Cry1Ie5表达的包涵体蛋白对小菜蛾和亚洲玉米螟具有杀虫活性,LC50分别为0.43μg/mL和48.39μg/mL;对棉铃虫的致死率不高,但能明显抑制其生长;对甜菜夜蛾没有杀虫活性。
In order to obtain novel lepidopteran insecticidal genes, PCR method was used for identification of cry1I-type gene from Bacillus thuringiensis(Bt) strains BN23-5. According to the NCBI open cry1I-type gene encoding area, a pair of degenerate primers was designed. A full-length cry1Ie gene was cloned by PCR amplification with B. thuringiensis strain BN23-5 as template. It contained an open reading frame of 2 160 bp nucleotides encoding a protein of 719 amino acids. Compared with other Cry1Ie protein, it shared 95.4% amino acid homology with Cry1Ie2 and Cry1Ie3. It was designated as Cry1Ie5 by Bacillus thuringiensis Insecticidal Crystal Proteins Nomenclature Committee and the NCBI accession number was KJ710646. It was constructed into the recombinant plasmid pET28a, and transformed into Escherichia coliBL21 (DE3). The result of SDS-PAGE indicated that cry1Ie5 could be expressed as 81 kD protein in E.coli BL21 (DE3) strain induced by IPTG. The bioassay results indicated that the Cry1Ie5 protein was highly toxic to the larvae of Plutella xylostella and Ostrinia furnacalis with a LC50 value of 0.43 μg/mL and 48.39 μg/mL, respectively; and had low activity against cotton bollworm, but could obviously inhibit the growth of it; it had no activity against beet armyworm.
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.
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