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Search Results: 1 - 10 of 59839 matches for " Xiu-Juan Jiang "
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catena-Poly[[silver(I)-μ-4,4′-bipyridine-κ2N:N′] 4-[2-(4-carboxyphenyl)-1,1,1,3,3,3-hexafluoropropan-2-yl]benzoate]
Xiu-Juan Jiang
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812015322
Abstract: Assembly of the flexible dicarboxylic ligand 4-[2-(4-carboxyphenyl)-1,1,1,3,3,3-hexafluoropropan-2-yl]benzoate and 4,4′-bipyridine as co-ligand with AgI ions resulted in the formation of the polymeric title compound, {[Ag(C10H8N2)](C17H9F6O4)}n, in which the metal atoms are bridged by the 4,4′-bipyridine ligands, generating cationic chains extending along [010]. The dihedral angles between the benzene rings in the anion and the pyridine rings in the cation are 72.42 (9) and 9.36 (10)°, respectively. The molecular conformation of the anion is stabilized by intramolecular C—H...F hydrogen bonds. In the crystal, the anions interact with the cationic chains via C—H...O hydrogen bonds, forming layers parallel to (001), in which weak π–π stacking interactions [centroid–centroid distances = 3.975 (3)–4.047 (3) ] involving the pyridine rings of adjacent 4,4′-bipyridine ligands are present. The planes are further assembled into a three-dimensional network by O—H...O hydrogen bonds.
4-Amino-3,5-bis(2-pyridyl)-4H-1,2,4-triazole–benzene-1,2,3-tricarboxylic acid–water (1/1/2)
Xiu-Juan Jiang
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810010470
Abstract: Cocrystallization of 4-amino-3,5-bis(2-pyridyl)-1,2,4-triazole (2-bpt) with hemimellitic acid (benzene-1,2,3-tricarboxylic acid) dihydrate (H3HMA·2H2O) produces the supramolecular title compound, C12H10N6·C9H6O6·2H2O. Intermolecular N—H...N hydrogen bonds are observed between the terminal pyridyl and amino groups of the 2-bpt molecule and the dihedral angles between the central ring and the pendant pyridine rings are 3.4 (7) and 13.8 (7)°. In the structure, homosynthons of graph set R22(8) are observed to form centrosymmetric H3HMA dimers, which are extended into a two-dimensional supramolecular layer via intermolecular O—H...N and C—H...O hydrogen bonds and π–π stacking interactions [centroid–centroid distance = 3.541 (3) ]. In addition, interlayer uncoordinated water molecules connect the layers through O—H...O hydrogen bonds, generating a three-dimensional network.
The Detection of Lethal Effects of Algal Derived DMSP of Pleurochrysis carterea on Artemia salina

WANG Xiu-juan,ZHOU Cheng-xu,YAN Xiao-jun,JIANG Ying,

生态毒理学报 , 2010,
Abstract: Pleurochrysis carterea has significant lethal effect on Artemia salina. However, the mechanism needs further explanations. In order to analyze whether the algal-derived DMSP and its degradation products DMS and acrylic acid are the reasons that cause the death of A. salina, the quantitative changes of DMSP and its cleavage products from P. carterae cell under the predation pressure of A.salina have been studied. The direct effects of DMSP, DMS and acrylic acid on A. salina have been studied as well. The results show that, no toxic effect was observed when high volatile DMS was introduced in the system. Concentration and time dependent lethal effects were observed when 0.08~1.0mM of DMSP or acrylic acid was repeatedly added to Artemia salina. However, from the results of the pH test, the repeatedly adding reagent caused significant decline in pH, which might be the direct reason for the death of A. salina. The amounts of cellular DMSP and its cleavage products did not reach the lethal level to A. salina. However, base on the theoretical calculations, the accumulation amounts of DMSP and related cleavage products inside A. salina were significant to cause low pH pulses, which might be a reason that caused the death of A. salina.
Research on the diffraction characteristics of phase modulated laser beams dispersed spectrally

Jiang Xiu-Juan,Zhou Shen-Lei,Lin Zun-Qi,Zhu Jian,

物理学报 , 2006,
Abstract: It is simulated numerically the transmission of beams phase modulated and spectrally dispersed by the unit for smoothing by spectral dispersion put in the laser driver for inertial confinement fusion. The results show that the diffraction spot of a spectrally dispersed beam becomes larger and its near-field uniformity is improved, while there exists area where the intensity is nearly even within the far-field spot. The effects of the main parameters of the electro-optic phase modulator and the grating in the unit on the diffraction characteristics of the beams are further discussed, and it is found that intensity modulation emerges in the far-field spot under some conditions.
Improving of the irradiation uniformity on targets with a diffraction-weakened lens array and spectral dispersion smoothing

Jiang Xiu-Juan,Zhou Shen-Lei,Lin Zun-Qi,Zhu Jian,

物理学报 , 2006,
Abstract: A scheme employing a lens array and the technique of smoothing by spectral dispersion is presented for uniform irradiation on targets in inertial confinement fusion. Quasi-near field spots with a profile of sharp edge and flat top can be obtained with a diffraction-weakened lens array, while the speckles imposed on the spot by beamlets interference can be smoothed by spectral dispersion. Simulation results indicate that this scheme is a good candidate for improving the irradiation uniformity. The dependence of the smoothing performance on the characteristics of phase modulation and dispersion is further discussed, and it is found that parameters of the system of spectral dispersion and lens array must be chosen carefully to make optimal compromise between uniformity and usable energy of the laser beam.
Smoothing of small on-target spots produced by frequency-tripled beams using lens arrayand spectral dispersion

Jiang Xiu-Juan,Li Jing-Hui,Li Hua-Gang,Zhou Shen-Lei,Li Yang,Lin Zun-Qi,

物理学报 , 2012,
Abstract: The performances of the smoothing of small target spots with a lens array (LA) and two-dimensional smoothing by spectral dispersion (2D SSD) in frequency-tripled high-power laser driver are numerically studied. Intensity distributions and spatial power spectra of the spots are analyzed. Simulative results show that LA can reduce the near-field nonuniformity of the beam and control the envelope of on-target intensity distribution. The 2D SSD has obvious effects in eliminating high-contrast intensity modulation, even in the case that the spots are very small. The results indicate that SSD mainly smoothes the intensity modulation at low-to-middle spatial frequency for small spots, and this would lead to the modifying of the spot profile, while for large spots, SSD sweeps the fine speckle structure to reduce nonuniformity at middle-to-high frequency. These results are valuable for choosing the suitable beam smoothing method in indirect-drive experiment.
Characteristics and Loads of Key Sources of Pollutions Discharged into Beishi River, Changzhou City

LI Chun-ping,JIANG Jian-guo,CHEN Ai-mei,WU Jia-ling,FAN Xiu-juan,YE Bin,

环境科学 , 2010,
Abstract: 以常州市老城区北市河为研究区域,对其汇水区域内的所有重点污染源的污水产生量、污染物性质及排污去向进行了详细调查和监测,利用确定的污染系数计算出各污染源的排污负荷.结果表明,除pH外,常州市的垃圾屋、垃圾转运站、公厕、餐饮等污染源排放的污水中SS、COD、BOD5、氨氮、TN、TP等浓度较高,远远超过了《污水综合排放标准》(GB 8978-1996)及《污水排入城市下水道水质标准》(CJ 3082-1999); 其中:垃圾转运站的COD最高达51700 mg/L,而公厕污水中氨氮和TN分别高达1616 mg/L和2044 mg/L.各污染源通过雨水管网进入河道的比例较高.排入北市河的年污染负荷源类型中,以餐饮业最多,其次是环卫设施;污染物以COD最高,为125.2 t/a;其次是BOD5,为40.53 t/a;因此,各污染源的COD和BOD5应为主要控制目标,且应首先对沿河餐饮和环卫设施进行截污治理.
Separate base usages of genes located on the leading and lagging strands in Chlamydia muridarum revealed by the Z curve method
Feng-Biao Guo, Xiu-Juan Yu
BMC Genomics , 2007, DOI: 10.1186/1471-2164-8-366
Abstract: The occurrence frequencies of bases of protein-coding genes in C. muridarum genome were analyzed by the Z curve method. It was found that genes located on the two strands of replication have distinct base usages in C. muridarum genome. According to their positions in the 9-D space spanned by the variables u1 – u9 of the Z curve method, K-means clustering algorithm can assign about 94% of genes to the correct strands, which is a few percent higher than those correctly classified by K-means based on the RSCU. The base usage and codon usage analyses show that genes on the leading strand have more G than C and more T than A, particularly at the third codon position. For genes on the lagging strand the biases is reverse. The y component of the Z curves for the complete chromosome sequences show that the excess of G over C and T over A are more remarkable in C. muridarum genome than in other bacterial genomes without separating base and/or codon usages. Furthermore, for the genomes of Borrelia burgdorferi, Treponema pallidum, Chlamydia muridarum and Chlamydia trachomatis, in which distinct base and/or codon usages have been observed, closer phylogenetic distance is found compared with other bacterial genomes.The nature of the strand biases of base composition in C. muridarum is similar to that in most other bacterial genomes. However, the base composition asymmetry between the leading and lagging strands in C. muridarum is more significant than that in other bacteria. It's supposed that the remarkable strand biases of G/C and T/A are responsible for the appearance of separate base or codon usages in C. muridarum. On the other hand, the closer phylogenetic distance among the four bacterial genomes with separate base and/or codon usages is necessary rather than occasional. It's also shown that the Z curve method may be more sensitive than RSCU when being used to quantitatively analyze DNA sequences.The compositional asymmetry between the leading and lagging strands in bacte
The Characters and Evolution of Minerogenetic Fluids of Changpu Tin Deposits

MA Xiu-juan,

地球学报 , 1995,
Abstract: 长埔矿区矿物中流体包裹体十分丰富,主要有液相包裹体、气相包裹体、含液态CO_2多相包裹体以及含子矿物多相包裹体。成矿作用阶段大致可分为锡石-石英-电气石阶段,锡石-硫化物阶段以及无矿石英阶段。各阶段叠加现象明显,3个阶段从早到晚温度、盐度有从高变低的趋势。矿区成矿温度范围160-410℃,最佳温度220-340℃,盐度为2-16W_(Nacl)%,压力为30-45MPa,相当于成矿深度1.2-1.8km。成矿流体主要来自于岩浆热液,晚期有大气降水的影响。流体沸腾温度为269.2℃,压力为12.5MPa,深度为0.5km。
Equitable utilisation and effective protection of sharing transboundary water resources:international rivers of western China

HE Da-ming,LIU Xiu-juan,

地理学报 , 2001,
Abstract: Western China includes 12 provincial divisions (the 7 provinces of Sichuan, Guizhou, Yunnan, Shaanxi, Gansu, Qinghai and; 5 autonomous regions of Tibet, Ningxia, Xinjiang, Inner Mongolia and Guangxi; and one city of Chongqing), which comprise 71.4% of the national land area, 28.5% of the national population and produce 17.5% of the national GDP in China. There are 17 countries that have riparian relationships with western China, most of which are water-short countries. All are listed by UN ESCAP as countries with potential water crisis. The co-operative development and coordinated management of international rivers in western China is an important step toward the implementation of the national Great Western Development program. Taking into account of the national strategy and object hierarchy, as well as the development demand of the western region, it is necessary to pursue the multi-disciplinary study of the equitable allocation, utilisation, and ecoenvironment protection of transboundary water resources in the region. Such efforts will undoubtedly provide scientific evidence and support for the decision-making of the environmental protection and ecological construction and management in the western regions, the enforcement of the sub-regional economic co-operation, mitigation of trans-boundary conflicts, and enhancing bio-diversity conservation.
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