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Search Results: 1 - 10 of 42760 matches for " Yuxiang Xu "
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Influences of SiO2/Na2O Molar Ratio on Aging and Chemical Modification of Water Glass  [PDF]
Huan Yang, Hailan Xu, J. Kriss Frank, Guangtong Xu, Weiwei Huan, Chaoying Ni, Yuxiang Yang
Open Journal of Inorganic Chemistry (OJIC) , 2016, DOI: 10.4236/ojic.2016.62008
Abstract: In this paper, the content of water glass before and after adding modifying agent was measured by Trimethylsilyl-gas-chromatography. The experimental results showed that different modulus of water glass could generate different content of mono-silicate acid and oligomeric silicate acid in water glass. After a period of storage, different modulus of water glass led to decrease of silicate content at different levels. Because higher content of Na2O in water glass tended to incur the alkaline polymerization, the occurrence of depolymerization of silicate species would lead to an increase of oligomeric silicate species, resulting in a drawback of silicate species content after a period of storage. And contrary to that, lower content of Na2O in water glass tended to incur the acidic polymerization. When the modifying agent was added to the newly made water glass, the amount of mono-silicate acid and oligomeric silicate acid also decreased. In modified water glass, the change of each silicate acid species was less than that in unmodified water glass. These results showed that the modifying agent retarded the aging of water glass. It had remarkable significance on the theory and practical application of water glass chemistry.
Isolation of a Microorganic Strain for the High Volume Degradation of Aniline Blue and Its Application in Natural Sewage Treatment  [PDF]
Wenhao Li, Cheng Li, Yuxiang Xu, Qin Wang, Xin Ma, Shouwen Chen, Jun Yu, Yong Yang
Computational Molecular Bioscience (CMB) , 2018, DOI: 10.4236/cmb.2018.84008
Abstract: Aniline blue, one of the triphenylmethane dyes, is the most commonly produced and used of these dyes yet it is also the most dangerous and the most serious cause of pollution amongst them. An exploration of aniline blue degradation is likely to facilitate an understanding of the degradation mechanism for a range of related dyes. In this study, we managed to isolate a particular strain of microorganism, identified to be Lysinibacillus fusiformis N019a, which showed a significant capacity for aniline blue degradation in both laboratory tests and natural sewage treatment. In analysis aided by a UV-Visible spectrophotometer, we found that 96.7% of aniline blue had degraded within 24 hours under laboratory conditions. When treating natural sewage, 80.1% of the aniline blue was removed after just 16 hours. Further analysis has shown that Lysinibacillus fusiformis N019a has a strong resistance to Cu2+, Mn2+, Zn2+, and Pb2+
Study on Optimizing Nutrition and Fermentation Conditions for Compound Bacillus spp.  [PDF]
Yanyan Li, Yuxiang Xu, Wenhao Li, Yong Yang, Lin Wang, Jun Yu, Changjun Wang, Xihong Li
American Journal of Molecular Biology (AJMB) , 2019, DOI: 10.4236/ajmb.2019.92007
Abstract: In order to improve the spore yield of compound Bacillus spp. (B. amyloliquefaciens, B. laterosporus and B. megaterium), the effects of nutrient conditions including carbon source, nitrogen source, mineral salt and fermentation conditions including the inoculum age, inoculation amount, loading volume of liquid and initial pH on the spore yield were studied. The results indicated that the optimized medium was glucoses 20 g/L, soybean meal 30.0 g/L, K2HPO4 1.0 g/L; fermentation temperature is 37, the inoculum age 12 h, initial pH 7.0, 2% inoculation amount, loading volume of liquid 20 mL/250 mL. Under the optimized conditions of culture medium and fermentation for compound Bacillus spp., spore yield was 10.24 times more than the initial medium, and the spore formation rate reached more than 90%.
Terahertz Metamaterial-Based Microbolometers Fabricated by Conventional MEMS  [PDF]
Tianhong Ao, Xiangdong Xu, Yu Gu, Zhegeng Chen, Yadong Jiang, Xinrong Li, Yuxiang Lian, Fu Wang, Qiong He
Optics and Photonics Journal (OPJ) , 2016, DOI: 10.4236/opj.2016.68B036
37 μm × 37 μm array of metamaterial-based microbolometers was designed and successfully fa-bricated by conventional MEMS technology. FTIR measurements reveal that the as-designed mi-crobolometers exhibit a high absorption of ~31.5% at 3.93 THz. In contrast, no response can be detected from those microbolometers without metamaterials. The experimental results have been confirmed by simulations.
The Influence of PbI2 on Characteristic of Organic-Inorganic Hybrid Perovskite Thin Films  [PDF]
Yuze Peng, Yuxiang Wu, Linlin Tang, Juan Li, Jian Xu, Yangyang Du, Like Huang, Hongkun Cai, Jian Ni, Jianjun Zhang
Modeling and Numerical Simulation of Material Science (MNSMS) , 2017, DOI: 10.4236/mnsms.2017.74004
Abstract: Organic-inorganic hybrid perovskite materials have attracted significant research efforts because of their outstanding properties. Meanwhile the crystallization of organic-inorganic hybrid perovskite materials can significantly influence the films quality. Here, we research the influence of the characteristics of PbI2 thin film on final perovskite films and the mechanisms of film formation based on the two-step sequential deposition method. We found that the characteristics of PbI2 thin film, such as the grain size, the grain shape, the surface roughness and the film densification, have significant effects on the final perovskite films due to different film crystallization process. According to the analysis on the characteristics of the perovskite films obtained from different PbI2precursor, we suggested that the formation of perovskite film begins from the PbI2 crystals expanding when they are converted to MAPbI3 perovskite by migration of MA+ cations from the grain boundaries.
Electromechanical Impedance Response of a Cracked Timoshenko Beam
Yuxiang Zhang,Fuhou Xu,Jiazhao Chen,Cuiqin Wu,Dongdong Wen
Sensors , 2011, DOI: 10.3390/s110707285
Abstract: Typically, the Electromechanical Impedance (EMI) technique does not use an analytical model for basic damage identification. However, an accurate model is necessary for getting more information about any damage. In this paper, an EMI model is presented for predicting the electromechanical impedance of a cracked beam structure quantitatively. A coupled system of a cracked Timoshenko beam with a pair of PZT patches bonded on the top and bottom surfaces has been considered, where the bonding layers are assumed as a Kelvin-Voigt material. The shear lag model is introduced to describe the load transfer between the PZT patches and the beam structure. The beam crack is simulated as a massless torsional spring; the dynamic equations of the coupled system are derived, which include the crack information and the inertial forces of both PZT patches and adhesive layers. According to the boundary conditions and continuity conditions, the analytical expression of the admittance of PZT patch is obtained. In the case study, the influences of crack and the inertial forces of PZT patches are analyzed. The results show that: (1) the inertial forces affects significantly in high frequency band; and (2) the use of appropriate frequency range can improve the accuracy of damage identification.
Research and applications of biochip technologies
Junquan Xu,Xuezhong He,Yuxiang Zhou,Litian Liu,Jing Cheng
Chinese Science Bulletin , 2000, DOI: 10.1007/BF02884651
Abstract: Biochip as a new research field has enjoyed its rapid development in the past 10 years. Using microfabrication technology, thousands or hundred thousands of biological molecules can be assembled on a centimeter square microchip. Those chip-based devices can be used to analyze mutations, antigens, cells, etc. Compared with the traditional analytical instruments, chip-based micro total analytical systems have many advantages, such as reduced size, lower consumption of both reagents and energy, contamination-free, etc. Biochip technology is believed to revolutionize the future research in life sciences, disease diagnosis, drug discovery, forensic sciences and outer space exploitation in the coming century.
Physicochemical Properties and Antioxidant Activities of Luteolin-Phospholipid Complex
Keyong Xu,Benguo Liu,Yuxiang Ma,Jiquan Du,Guanglei Li,Han Gao,Yuan Zhang,Zhengxiang Ning
Molecules , 2009, DOI: 10.3390/molecules14093486
Abstract: luteolin and phospholipid complex was prepared to improve the lipophilic properties of luteolin. The physicochemical properties of the complex were analyzed by ultraviolet-visible spectrometry (UV), infrared spectrometry (IR), X-ray diffractometry (XRD) and differential scanning calorimetry (DSC). The results showed that luteolin and phospholipid in the complex were joined by non-covalent-bonds and did not form a new compound. It was found that the complex was an effective scavenger of DPPH radicals, with an IC50 value of 28.33 μg/mL. In the Rancimat antioxidant test using lard oil as substrate, the complex also showed the strong antioxidant activity.
The early-warning effects of assimilation of the observations over the large-scale slope of the “World Roof” on its downstream weather forecasting
ShiQiu Peng,XiangDe Xu,XiaoHui Shi,DongXiao Wang,YuXiang Zhu,JingJiao Pu
Chinese Science Bulletin , 2009, DOI: 10.1007/s11434-008-0560-6
Abstract: To improve the numerical simulation of the severe snow storms occurred in the south of China and the middle/lower reaches of Changjiang River during January of 2008, the observations from the automatic weather stations (AWS) over the Qinghai-Xizang Plateau (QXP) and its surrounding areas were assimilated into the Weather Research and Forecasts (WRF) model using multi-cycle 3-dimensional variational data assimilation (3DVAR). Due to the large-scale special topography of the QXP and its surrounding areas which may reach up to the mid-troposphere, the AWS located at different height on the deep slope of the plateau are different to those located on plains and take a role analogous in some extent to that of radio soundings in obtaining the vertical “profile” information of the atmosphere, and have the advantages in the aspects of sampling frequency, location/height fixing, and synchronization. The information captured by these AWS may carry the early-warning “strong signals” in the upstream sensitive area for the downstream weather systems to the east of the plateau and thus the assimilation of these AWS data is expected to lead to significant improvements on the simulation of the severe weather system occurred in its downstream areas through adjusting the 3-dimensional structures of the atmospheric thermal-dynamics for the initial conditions of the model. This study indicates that the assimilated information of moisture, temperature and pressure carried in the observations of AWS over the Qinghai-Xizang Plateau and its surrounding areas is very important and useful in the forecasting of precipitation in its downstream areas.

Zhang Xuan,Fang Shunming,Chen Xu,Zhou Yuxiang,

生物物理学报 , 1999,
Abstract: The effects of rare earth ions (Ln3 ) on the activity of Ca2 -Mg2 -ATPase stimulated by calmodulin (CaM) have been studied. The results revealed that the curve of Ca2 -Mg2 -ATPase activity stimulated by CaM in different Ln3 concentration is apparently biphase. Ln3 can activate CaM at low concentration, but they have inhibitive function at high concentration. Some Ln3 (Sm3 ) only shows inhibitive effect. In the absence of CaM, Ln3 inhibits the basic activity of Ca2 -Mg2 -ATPase at high concentration. The molecular mechanism of interaction between Ln3 and CaM has been studied primarily by CD spectroscopy.
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