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Search Results: 1 - 10 of 88398 matches for " Hui-jun Zhao "
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New bactericide derived from Isatin for treating oilfield reinjection water
Gang Chen, Hui-jun Su, Min Zhang, Fang Huo, Jie Zhang, Xiao-jiang Hao, Jing-rui Zhao
Chemistry Central Journal , 2012, DOI: 10.1186/1752-153x-6-90
Abstract: The roots and the leaves of the plant, Strobilanthes cusia (Nees) Kuntze of the Acanthaceae family that is widely distributed in northern and central China, have been used in traditional Chinese medicine to treat a variety of ailments caused by microorganisms and virus. It is suggested that the demonstrated use can be extended to processing oilfield water to remove or reduce bacteria before the water is re-injected into formations via wells.The alkaloid isatin or indole-2-3-dione (Figure 1) is a compound found in Strobilanthes cusia (Nees) Kuntze and many other plants such as genus Isatis, Calanthe discolor LINDL, Couroupita guianensis Aubl. and in mammalian tissue [1]. It has versatile bioactivity [2] and it is used to synthesize a large variety of heterocyclic compounds in preparing drugs [3-7]. Isatin Schiff bases are reported to have antibacterial activity against Bacillus subtilis[8], Gram(+) and Gram(?) bacterial strains [9] and Magnaporthe grisea[10] among others. The compound has been produced industrially and can thus be used for large-scale applications such as treating oilfield water before re-injection.Isatin (1?mmol) was dissolved in methanol (20?ml) and a methanol solution of 1.2?mmol amino compound (10?ml) was added dropwise, until the disappearance of isatin, as evidenced by thin-layer chromatography. The solvent was removed in vacuo and the residue was separated by column chromatography (silica gel, petroleum ether/ ethyl acetate?=?1:1?~?1:3?v/v), to give the product. Single crystals of the compound 4 suitable for X-ray analysis was obtained on slow evaporation of a methanol solution (30?ml) of the product (30?mg) over a period of 7 d.Intensity data for colorless crystals of compound 4 was collected at 150?K on a Bruker SMART 1000 CCD fitted with Mo Ka radiation. The data sets were corrected for absorption based on multiple scans [11] and reduced using standard methods [12]. The structures was solved by direct-methods [13] and refined by a full-matr
Active radial basis function sliding mode controller for unified chaotic system with disturbance and uncertainties

Guo Hui-Jun,Liu Ding,Zhao Guan-Zhou,

物理学报 , 2011,
Abstract: An adaptive active radial basis function (RBF) sliding mode controller is designed to control a unified chaotic system with parametric uncertainties under external disturbance. The controlled system is divided into a controllable subsystem and a free subsystem. Based on the controllable canonical form of controllable sub-system's state errors at the target points, a sliding surface is defined as the only input to the RBF controller. The weight of the controller is tuned on-line based on the sliding mode rea...
Ductile fracture behavior of TA15 titanium alloy at elevated temperatures
Lei Yang,Bao-yu Wang,Jian-guo Lin,Hui-jun Zhao,Wen-yu Ma
- , 2015, DOI: https://doi.org/10.1007/s12613-015-1171-2
Abstract: To better understand the fracture behavior of TA15 titanium alloy during hot forming, three groups of experiments were conducted to investigate the influence of deformation temperature, strain rate, initial microstructure, and stress triaxiality on the fracture behavior of TA15 titanium alloy. The microstructure and fracture surface of the alloy were observed by scanning electronic microscopy to analyze the potential fracture mechanisms under the experimental deformation conditions. The experimental results indicate that the fracture strain increases with increasing deformation temperature, decreasing strain rate, and decreasing stress triaxiality. Fracture is mainly caused by the nucleation, growth, and coalescence of microvoids because of the breakdown of compatibility requirements at the α/β interface. In the equiaxed microstructure, the fracture strain decreases with decreasing volume fraction of the primary α-phase (αp) and increasing α/β-interface length. In the bimodal microstructure, the fracture strain is mainly affected by α-lamella width.
Effects of aluminum and titanium on the microstructure of ODS steels fabricated by hot pressing
Qian Zhao,Li-ming Yu,Yong-chang Liu,Yuan Huang,Zong-qing Ma,Hui-jun Li
- , 2018, DOI: https://doi.org/10.1007/s12613-018-1667-7
Abstract: Three oxide-dispersion-strengthened (ODS) steels with compositions of Fe?14Cr?2W?0.2V?0.07Ta?0.3Y2O3 (wt%, so as the follows) (14Y), Fe?14Cr?2W?0.2V?0.07Ta?1Al?0.3Y2O3 (14YAl), and Fe?14Cr?2W?0.2V?0.07Ta?0.3Ti?0.3 Y2O3 (14YTi) were fabricated by hot pressing. Transmission electron microscopy (TEM) was used to characterize the microstructures and nanoparticles of these ODS steels. According to the TEM results, 14Y, 14YAl, and 14YTi ODS steels present similar bimodal structures containing both large and small grains. The addition of Al or Ti has no obvious effect on the microstructure of the steels. The spatial and size distribution of the nanoparticles was also analyzed. The results indicate that the average size of nanoparticles in the 14YTi ODS steel is smaller than that in the 14YAl ODS steel. Nanoparticles such as Y2O3, Y3Al5O12 and YAlO3, and Y2Ti2O7 were identified in the 14Y, 14YAl, and 14YTi ODS steels, respectively.
Expression of PaEXP1 from Phytolacca acinosa seedling in response to adversity

WANG Hui,SUN Tao,ZHAO Hui-Jun,CHAI Tuan-Yao,

中国科学院研究生院学报 , 2010,
Abstract: With a full length cDNA of expansin, designed PaEXP1, was cloned in Phytolacca acinosa by the Homology-based cloning method. The PaEXP1 consisted of 1128 bp with an open reading frame of 759 bp that code a protein of 252 amino acids. Structural analysis showed that the eight cysteine residues and the HFD(His-Phe-Asp) sequence are near the N-terminal end, four tryptophan residues near the C-terminal end of predicted PaEXP1. The phylogenetic tree showed that PaEXP1 belonged to the α-expansion protein family. PaEXP1 was preferentially expressed in root. The expression of PaEXP1were strongly inhibited by various abiotic stress, such as the low temperature, salt, heavy metals and osmotic stress. The expression of PaEXP1 in yeast increased the average diameter of yeast, indicating PaEXP1 involved in cell wall expansion.
Properties of photon counting imaging system with Si thin films

Zhao Fei-Fei,Liu Yong-An,Hu Hui-Jun,Zhao Bao-Sheng,

物理学报 , 2010,
Abstract: The Si thin films on ceramic substrates,which were fabricated by electron beam evaporation,were applied as charge induction layers in photon counting imaging system with induction readout. The structures and micrograph of Si thin films were studied. The X-ray diffraction (XRD) analysis and field emission scanning electron microscopy (FESEM) images indicate that the thin film has amorphous structure and is coarse due to the lattice boundary of ceramic substrate. The experimental setup was established and the detector resolution,counting rate,pulse height distribution curves etc., with different Si film thickness were compared. The results suggest that the film thickness influences on spatial resolution less than on the counting rate. Moreover,the properties of the system with Si and Ge thin films of the same resistance were compared,which shows that the properties such as distortion,counting rate and dark count rate are better with the Si films.
Excess dietary cholesterol may have an adverse effect on growth performance of early post-larval Litopenaeus vannamei
Jin Niu, Peng-Fei Chen, Li-Xia Tian, Yong-Jian Liu, Hei-Zhao Lin, Hui-Jun Yang, Gui-Ying Liang
Journal of Animal Science and Biotechnology , 2012, DOI: 10.1186/2049-1891-3-19
Retrospective analysis for thirty-nine patients with solitary fibrous tumor of pleura and review of the literature
Wei Guo, Hua-Liang Xiao, Yao-Guang Jiang, Ru-Wen Wang, Yun-Ping Zhao, Zheng Ma, Hui-Jun Niu
World Journal of Surgical Oncology , 2011, DOI: 10.1186/1477-7819-9-134
Abstract: From January 2004 to December 2008, 39 patients underwent surgical resection of SFTP in our department. All patients had clinical follow-up by the same team of surgeons. The mean follow-up was 40.3 months.A local removal of the neoplasm was accomplished by video-assisted thoracic surgery (VATS) in 9 patients (group A) and by thoracotomy in 30 patients (group B) respectively. Comparing with group B, operations in group A took significantly less operative time, blood loss and spent less time in the intensive care unit and hospital. All specimens were positive for CD34 and Bcl-2. One patient developed recurrence, and the remaining 38 patients are alive and disease free at the end of follow-up.Malignant SFTP still had the potential recurrence. VATS represents the more acceptable choice for the selected patients with SFTP.As a rare primary neoplasm arising from mesenchymal cells in the areolar tissue subjacent to the mesothelial-lined pleura, the solitary fibrous tumor of the pleura (SFTP) was first mentioned by Wagner in 1870 [1], and the pathologic description did not appear until 1931 [2]. Due to the rarity of SFTP, there were only fewer than 800 cases reported before 2002 [3], and the understanding of this disease still remains unclear. Moreover, controversy about the origin of this uncommon tumor led to a variety of terms applied to the tumor in earlier years, such as localized pleural mesothelioma, pleural fibroma, localized fibrous mesothelioma, submesothelial fibroma, and localized fibrous tumor [3].SFTP is a mesenchymal tumor that tends to involve the pleura, although it has also been described in other thoracic areas (mediastinum, pericardium and pulmonary parenchyma) and in extrathoracic sites (meninges, epiglottis, salivary glands, thyroid, kidneys and breast) [3,4]. SFTP usually presents as a peripheral mass abutting the pleural surface, to which it is attached by a broad base or, more frequently, by a pedicle that allows it to be mobile within the pleural c
A simulation experiment system for X-ray pulsar based navigation

Hu Hui-Jun,Zhao Bao-Sheng,Sheng Li-Zhi,Yan Qiu-Rong,

物理学报 , 2011,
Abstract: A simulation experiment system for X-ray pulsar based navigation is setup in order to study the key technologies of X-ray pulsar navigation. The system consists of X-ray pulsar source generator, super sensitive X-ray photon counting detector, charge sensitive amplifier, shaping amplifier, time measurement, X-ray pulse profile reconstruction and pulse time of arrival (TOA) measurement. The system can simulate the X-ray pulsar source with different intensities, period and pulse profile. The TOA of individual X-ray photon is recorded, the pulse profile is reconstructed with these data. And by comparing the measured pulse profile with the standard pulse profile of the X-ray pulsar source generator, the pulse TOA is calculated. The construction and the principle of the simulation experiment system are introduced and experiment results are presented.
大气和海洋科学快报 , 2010,
Abstract: This paper addresses the ‘ice-free Arctic’ issue under the future global warming scenario. Four coupled climate models used in the third phase of the Coupled Model Intercomparison Project (CMIP3) were selected to project summer climate conditions over East Asia once the Arctic becomes ice-free. The models project that an ice-free Arctic summer will begin in the 2060s under the SRESA1B (according to IPCC Special Reports on Emissions Scenarios) simulations. Our results show that the East Asian summer monsoons will tend to be stronger and that the water vapor transport to central northern China will be strengthened, leading to increased summer precipitation in central northern China. The models also project an intensified Antarctic Oscillation, a condition which favors increased precipitation in South China’s Yangtze River Valley. The overall precipitation in Northwest China is projected to increase under ice-free Arctic summer conditions.
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