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Search Results: 1 - 10 of 118809 matches for " ZHANG Jing-jing "
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Study on Magnetic Properties of Dy0.15Fe1.85O3 Magnetic Nanoparticles at Low Temperature
ZHANG Mao-Run, SUN Jing-Jing, CHEN Jing
无机材料学报 , 2012, DOI: 10.3724/sp.j.1077.2012.12018
Abstract: Dy0.15Fe1.85O3 magnetic nanoparticles were prepared by coprecipitation-phase transfer method, and the effect of temperature variation on the magnetic properties of the nanoparticles at low temperature were investigated. The chemical composition, morphology, crystalline structure and magnetic properties of the samples at low temperature were characterized by X-ray fluorescence spectrometer(XRF), transmission electron microscope (TEM), X-ray diffraction (XRD) and super-conducting quantum magnetometer (SQUID). The results show that metal ions in the sample are mainly Dy3+ and Fe3+ whose mass fractions are 12.17% and 51.88%, respectively. The average diameter of the samples is ca. 15 nm. The magnetic particles are spherical with face-centered cubic spinel structure and complete crystalline. The saturation magnetization (MS) and coercivity (HC) of the samples increase with the decrease of temperature in the range of 56.5 K and 200.2 K. When the temperature exceeds or is equal to 142.8 K, the magnetic properties of the samples is at the superparamagnetic state. While the temperature is below 142.8 K, the superparamagnetic state is converted to ferromagnetic state.
GPU-Based 3D Cone-Beam CT Image Reconstruction for Large Data Volume
Xing Zhao,Jing-jing Hu,Peng Zhang
International Journal of Biomedical Imaging , 2009, DOI: 10.1155/2009/149079
Abstract: Currently, 3D cone-beam CT image reconstruction speed is still a severe limitation for clinical application. The computational power of modern graphics processing units (GPUs) has been harnessed to provide impressive acceleration of 3D volume image reconstruction. For extra large data volume exceeding the physical graphic memory of GPU, a straightforward compromise is to divide data volume into blocks. Different from the conventional Octree partition method, a new partition scheme is proposed in this paper. This method divides both projection data and reconstructed image volume into subsets according to geometric symmetries in circular cone-beam projection layout, and a fast reconstruction for large data volume can be implemented by packing the subsets of projection data into the RGBA channels of GPU, performing the reconstruction chunk by chunk and combining the individual results in the end. The method is evaluated by reconstructing 3D images from computer-simulation data and real micro-CT data. Our results indicate that the GPU implementation can maintain original precision and speed up the reconstruction process by 110–120 times for circular cone-beam scan, as compared to traditional CPU implementation.
Synthesis of N-substituted Acridinediones and Polyhydroquinoline Derivatives in Refluxing Water
Jing-Jing Xia,Ke-Hua Zhang
Molecules , 2012, DOI: 10.3390/molecules17055339
Abstract: Acridinediones were synthesized by the one-pot Hantzsch condensation of an aromatic aldehyde, 5,5-dimethyl-1,3-cyclohexanedione, and aniline/4-methylaniline in re?uxing water. This method has then been extended to the four-component reaction of an aromatic aldehyde, 5,5-dimethyl-1,3-cyclohexanedione, ethyl acetoacetate and ammonium acetate for the synthesis of polyhydroquinoline derivatives. This is an environmentally friendly and efficient procedure providing?good to excellent yields.
Bis{2,2′-[(2-aminoethyl)azanediyl]diethanaminium} di-μ-sulfido-bis(disulfidogermanate)
Chao Xu,Jing-Jing Zhang,Taike Duan,Qun Chen
Acta Crystallographica Section E , 2012, DOI: 10.1107/s160053681200092x
Abstract: In the title compound, (C6H20N4)2[Ge2S6], the dimeric [Ge2S6]4 anion is formed by two edge-sharing GeS4 tetrahedral units. The average terminal and bridging Ge—S bond lengths are 2.158 (14) and 2.276 (6) , respectively. The anions and the diprotonated ammonium cations are organized into a three-dimensional network by N—H...S and N—H...N hydrogen bonds.
Pyrimidine-2-carboxamide
Bing-Yu Zhang,Qian Yang,Jing-Jing Nie
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536807062770
Abstract: In the crystal strucuture of the title compound, C5H5N3O, which was obtained upon recrystallization of 2-cyanopyrimidine from aqueous sodium hydroxide, the amide group is twisted with respect to the aromatic ring by 24.9 (1)°. π–π stacking is observed between partially overlapped rings at a face-to-face separation of 3.439 (6) . The structure features a centrosymmetric pair of intermolecular N—H...O hydrogen bonds. Another N—H...O hydrogen bond between adjacent molecules links them into a helical chain motif.
Bis(pyrimidine-2-carboxylato-κ2N,O)copper(II)
Bing-Yu Zhang,Qian Yang,Jing-Jing Nie
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536807060977
Abstract: The title compound, [Cu(C5H3N2O2)2], was prepared in a water–ethanol solution containing 2-cyanopyrimidine, malonic acid and copper(II) nitrate trihydrate. The CuII ion, located on an inversion center, is chelated by two pyrimidine-2-carboxylate anions in a CuO2N2 square-planar geometry. The uncoordinated carboxylate O atom and pyrimidine N atoms are linked to adjacent pyrimidine rings via weak C—H...O and C—H...N hydrogen bonding. π–π Stacking is observed between nearly parallel pyrimidine rings, the centroid-to-centroid separation being 3.8605 (13) .
Piperazine-2,3,5,6-tetraone
Jing-Jing Jia,Xiu-Jin Meng,Shi-Zhang Liang,Shu-Hua Zhang
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810048075
Abstract: The molecule of the title compound, C4H2N2O4, is located around an inversion center and the four O atoms are in the 2,3,5,6-positions of the piperazine ring. In the crystal, bifurcated N—H...O hydrogen bonds link the molecules into a corrugated layer parallel to (101).
Piperazine-2,3,5,6-tetraone. Corrigendum
Jing-Jing Jia,Xiu-Jin Meng,Shi-Zhang Liang,Shu-Hua Zhang
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536810052712
Abstract: The correspondence author in the paper by Jia et al. [Acta Cryst. (2010), E66, o3315] is corrected.
Cloning, Identification, and Characterization of the rpoS-Like Sigma Factor rpoX from Vibrio alginolyticus
Jing-jing Zhao,Chang Chen,Lv-ping Zhang,Chao-qun Hu
Journal of Biomedicine and Biotechnology , 2009, DOI: 10.1155/2009/126986
Abstract: Vibrio alginolyticus ZJ-51 displays phase variation between opaque/rugose colonies (Op) and translucent/smooth colonies (Tr). These colony variants show great differences in biofilm formation and motility. In this study, a gene encoding for an rpoS-like sigma factor, rpoX, has been cloned and characterized. The absence of rpoX did not affect colony switching rate but did decrease biofilm formation in both the Op and the Tr variants. When challenged with hydrogen peroxide, the ΔrpoX in the Op background showed a slightly higher survival rate compared with the wild type, whereas survival was decreased in the Tr background. Deletion of rpoX in the Tr background resulted in a higher ability to resist ethanol challenges and to survive hyperosmolarity challenges, and in the Op background the opposite phenotype was observed. This indicates that the rpoX gene is involved in biofilm formation and stress response but the effects are controlled by colony phase variation in V. alginolyticus.
Genome-Wide Analysis of the Complex Transcriptional Networks of Rice Developing Seeds
Liang-Jiao Xue, Jing-Jing Zhang, Hong-Wei Xue
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0031081
Abstract: Background The development of rice (Oryza sativa) seed is closely associated with assimilates storage and plant yield, and is fine controlled by complex regulatory networks. Exhaustive transcriptome analysis of developing rice embryo and endosperm will help to characterize the genes possibly involved in the regulation of seed development and provide clues of yield and quality improvement. Principal Findings Our analysis showed that genes involved in metabolism regulation, hormone response and cellular organization processes are predominantly expressed during rice development. Interestingly, 191 transcription factor (TF)-encoding genes are predominantly expressed in seed and 59 TFs are regulated during seed development, some of which are homologs of seed-specific TFs or regulators of Arabidopsis seed development. Gene co-expression network analysis showed these TFs associated with multiple cellular and metabolism pathways, indicating a complex regulation of rice seed development. Further, by employing a cold-resistant cultivar Hanfeng (HF), genome-wide analyses of seed transcriptome at normal and low temperature reveal that rice seed is sensitive to low temperature at early stage and many genes associated with seed development are down-regulated by low temperature, indicating that the delayed development of rice seed by low temperature is mainly caused by the inhibition of the development-related genes. The transcriptional response of seed and seedling to low temperature is different, and the differential expressions of genes in signaling and metabolism pathways may contribute to the chilling tolerance of HF during seed development. Conclusions These results provide informative clues and will significantly improve the understanding of rice seed development regulation and the mechanism of cold response in rice seed.
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