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Search Results: 1 - 10 of 23369 matches for " Bozhi Shi "
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An Index for Characterization of Natural and Non-Natural Amino Acids for Peptidomimetics
Guizhao Liang, Yonglan Liu, Bozhi Shi, Jun Zhao, Jie Zheng
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0067844
Abstract: Bioactive peptides and peptidomimetics play a pivotal role in the regulation of many biological processes such as cellular apoptosis, host defense, and biomineralization. In this work, we develop a novel structural matrix, Index of Natural and Non-natural Amino Acids (NNAAIndex), to systematically characterize a total of 155 physiochemical properties of 22 natural and 593 non-natural amino acids, followed by clustering the structural matrix into 6 representative property patterns including geometric characteristics, H-bond, connectivity, accessible surface area, integy moments index, and volume and shape. As a proof-of-principle, the NNAAIndex, combined with partial least squares regression or linear discriminant analysis, is used to develop different QSAR models for the design of new peptidomimetics using three different peptide datasets, i.e., 48 bitter-tasting dipeptides, 58 angiotensin-converting enzyme inhibitors, and 20 inorganic-binding peptides. A comparative analysis with other QSAR techniques demonstrates that the NNAAIndex method offers a stable and predictive modeling technique for in silico large-scale design of natural and non-natural peptides with desirable bioactivities for a wide range of applications.
Simultaneous Adsorption and Degradation of Cr(VI) and Cd(II) Ions from Aqueous Solution by Silica-Coated Fe0 Nanoparticles
Yongchao Li,Hongpu Ma,Bozhi Ren,Tielong Li
Journal of Analytical Methods in Chemistry , 2013, DOI: 10.1155/2013/649503
Abstract: Core-shell silica-coated Fe0 nanoparticles (Fe@SiO2) were prepared in one-step synthesis by aqueous reduction combined with modified St?ber method. The as-prepared Fe@SiO2 were then used for simultaneous removal of Cr(VI) and Cd(II) from aqueous solution. Batch tests indicated that Fe@SiO2 exhibited high removal capacity toward Cr(VI) and Cd(II). Cr(VI) was removed by Fe@SiO2 through reduction rather than adsorption, while Cd(II) removal was mainly through adsorption. The removal rate increased with increasing initial Fe NPs dose and decreased with increasing initial Cr(VI) and Cd(II) concentrations. Cd(II) adsorption was also strengthened by Cr(VI) reduction with the release of OH?. The removals of Cr(VI) and Cd(II) were weakened in the presence of cations or humic acid, as a result of aggregation and less active site of Fe@SiO2. Overall, the simply prepared Fe@SiO2 were potential material for the heavy metals removed from water. 1. Introduction Most heavy metals are toxic and carcinogenic even at very low concentrations and usually cause a serious threat to the environment and the public health. For example, Cr(VI) is a toxic, carcinogenic substance to human and animals [1]. Contrarily, Cr(III) is relatively nontoxic and an essential nutrient for human [2]. Cd(II) is also a potent carcinogen causing damage to the lungs, kidneys, liver, and reproductive organs [3, 4]. Therefore, US Environmental Protection Agency [5] regulates at least ten metals, including chromium and cadmium, as primary contaminants that must be removed from drinking water. There are various conventional techniques applied for removing heavy metals from water. Electroplating wastewater usually contains various heavy metals as cocontaminants; however, few studies have been reported on simultaneous removal of Cr(VI) and Cd(II) from wastewater. Among the different treatments for removing heavy metals, adsorption has been developed as a simple, efficient, and cost-effective method. Many of adsorbents such as clays, activated carbon, sewage sludge, and plant parts have been used for heavy metal removal [6–9]. But due to extremely small particle size and large surface area, iron nanoparticles (Fe NPs) with a high adsorption capacity are found to be one of the most effective adsorbents for removing heavy metals [10–12]. Moreover, Fe NPs have shown a high chemical reduction rate on several kinds of contaminants, including toxic metal ions [13–15]. For example, Ponder et al. [13] have found that Fe NPs acting as reductants could chemically reduce Cr(VI) to Cr(III). Besides, Fe NPs can
Static synthesis of high-quality MCM-22 zeolite with high SiO2/Al2O3 ratio
Zhicheng Liu,Shaodian Shen,Bozhi Tian,Jinyu Sun,Bo Tu,Dongyuan Zhao
Chinese Science Bulletin , 2004, DOI: 10.1360/03wb0167
Abstract: We demonstrate a synthesis method to broaden the range of SiO2/Al2O3 ratio (30–100) of high-silica MCM-22 zeolites by prolonging the aging time of the gel before the crystallization. The synthesis conditions such as silica sources, chemical compositions of initial gel and aging time of gel were investigated in detail. High quality MCM-22 products with various morphologies have been synthesized by optimize their synthesis conditions. Our results show that increasing of the aging time can make the gel be homogenization and promote their nucleus formation, which may avoid the formation of impurity phase and thus broaden the range of SiO2/Al2O3 ratio.
The experimental study on utilization of the urban sewage sludge in the process of sintering brick with fly-ash and clay
粉煤灰-粘土砖烧制过程处理城市污水污泥的试验研究

REN Bozhi,LONG Tengrui,CHEN Qiunan,
任伯帜
,龙腾锐,陈秋南

环境科学学报 , 2003,
Abstract: Possible utilization of urban sewage sludge, in the process of produetion of sintering brick with fly-ash and was investigatel. The results showed that the burning capacity of coal is raised and improved by adding 20 percent urban sludge containing 80 percent water into the coal. It did not affect the qualities of the sintering end products by adding 30 percent urban sludge contained 80 percent water into the fly-ash and clay. The 50 percent of urban sludge can be consummed in this process.
Static synthesis of high-quality MCM-22 zeolite with high SiO2/Al2O3 ratio
Static synthesis of high-quality MCM-22 zeolite with high SiO2/Al2O3 ratio

Zhicheng Liu,Shaodian Shen,Bozhi Tian,Jinyu Sun,Bo Tu,Dongyuan Zhao,
LIUZhicheng
,SHENShaodian,TIANBozhi,SUNJinyu,TUBo,ZHAODongyuan

科学通报(英文版) , 2004,
Abstract: We demonstrate a synthesis method to broaden the range of SiO2/Al2O3 ratio (30-100) of high-silica MCM-22 zeolites by prolonging the aging time of the gel before the crytallization. The synthesis conditions such as silica sources, chemical compositions of initial gel and aging time of gel were investigated in detail. High quality MCM-22 products with various morphologies have been synthesized by optimise their synthesis conditions. Our results show that increasing of the aging time can make the gel be homogenisation and promote their nucleus formation, which may avoid the for-mation of impurity phase and thus broaden the range of SiO2/Al2O3 ratio.
A High Efficiency Spread Spectrum Scheme Using Approximate Orthogonal Complex Sequences  [PDF]
Xiaohong SHI
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2010, DOI: 10.4236/ijcns.2010.31011
Abstract: This paper presents a high efficiency spread spectrum scheme using approximate orthogonal complex (AOC) sequences. In this scheme, the 64 AOC sequences picked up from 84 complex sequences space are employed for spreading spectrum. In modulation, 6 input bits is used to select one AOC sequence, and the selected sequence is then phase-rotated by another 2 input bits. In demodulator, a complex correlator detects the transmitted AOC sequence. Simulation results show that the proposed scheme has better BER performance than the existing complementary code keying (CCK) modulation scheme. For AOC, additional processing gain of 1.79dB can be obtained when the sequence length is 8.
Foundations of Intelligence Science  [PDF]
Zhongzhi Shi
International Journal of Intelligence Science (IJIS) , 2011, DOI: 10.4236/ijis.2011.11002
Abstract: In order to make significant progress toward achievement of human level machine intelligence a paradigm shift is needed. More specifically, the natural intelligence and artificial intelligence should be closely interacted in Intelligence Science study, instead of separate from each other. In order to reach the paradigm, brain science, cognitive science, artificial intelligence and others should cross-research together. Brain science explores the essence of brain, research on the principle and model of natural intelligence in molecular, cell and behavior level. Cognitive science studies human mental activity, such as perception, learning, memory, thinking, consciousness etc. Artificial intelligence attempts simulation, extension and expansion of human intelligence using artificial methodology and technology. All together pursue to explore the mechanism and principle of intelligence which is the engine of advanced science and technology. The paper will give the definition of intelligence and discuss ten big issues of Intelligence Science. The conclusion and perspective will be given in last section.
Numerical Study of Initial Soil Moisture Impacts on Regional Surface Climate  [PDF]
Xueli Shi
Atmospheric and Climate Sciences (ACS) , 2011, DOI: 10.4236/acs.2011.14019
Abstract: In this paper, the impacts of initial soil moisture (SM) over the Huaihe River Basin of China on the summertime climate have been investigated with a regional climate model. Three fourth-month-long simulations are made for two summers, the abnormal flooding in 2003 and normal climate in 2004. Besides control simulations (noted as CTL), sensitivity experiments have been conducted by assigning the initial soil moisture equals to 50% and 150% of the simulated soil moisture while keeping the others unchanged, which are noted as SM50 and SM150, respectively.The results show that effects of initial SM anomalies at late spring can last for the whole summer, and the increase of initial soil moisture (SM150) has more significant effects than the decreased one (SM50). The differences between sensitivity experiments and CTL mainly appear at surface and near-surface atmosphere. When increasing the initial SM, the latent heat flux and surface soil moisture are increased, correspondingly the sensible heat flux, temperature and radiation are all decreased. The changes of rainfall are not distinct between SM50 and SM150, which might be related to the processes within atmosphere, especially the humidity pattern.
Cost Optimal Selection of Storage Tanks in LPG Vaporization Station  [PDF]
Guohua Shi
Natural Resources (NR) , 2012, DOI: 10.4236/nr.2012.33021
Abstract: Liquefied petroleum gas (LPG) is an important urban gas source in China. Before supplied to customers by pipeline supply systems, LPG is stored in tanks in LPG vaporization stations. Designers usually decide the number and the size of storage tanks by their experience during constructions of vaporization stations. These decisions are usually not best and most economical. To solve the problem, a compact mixed integer nonlinear programming model has been developed in this paper. The objective is to minimize annual storage cost of the vaporization station. The model has been transformed into a general nonlinear programming model by transforming integer variables and 0-1 variables into continuous variables. One LPG vaporization station was taken as an example to illustrate the usage of the model. The results show that the optimal storage scheme can be determined accurately and quickly by the model and about 15% of storage cost can be saved every year after optimization.
A Cyclic Cosmological Model Based on the f(ρ) Modified Theory of Gravity  [PDF]
Yaoming Shi
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.48A004
Abstract:

We consider FLRW cosmological models for perfect fluid (with ρ as the energy density) in the frame work of the f(ρ) modified theory of gravity [V. N. Tunyak, Russ. Phys. J. 21, 1221 (1978); J. R. Ray, L. L. Smalley, Phys. Rev. D. 26, 2615 (1982)]. This theory, with total Lagrangian R-f(ρ), can be considered as a cousin of the F(R) theory of gravity with total Lagrangian F(R)-ρ. We can pick proper function forms f(ρ) to achieve, as the F(R) theory does, the following 4 specific goals, 1) producing a non-singular cosmological model (Ricci scalar and

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