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Search Results: 1 - 10 of 44005 matches for " Yahong Wu "
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Preparation of N, N, N′, N′-tetrakis-(2-benzimidazolylmethyl)-1,2-ethanediamine and crystal assemblies of the relative complexes  [PDF]
Shanling Tong, Yahong Wu, Zhaoyong Tian, Yan Yan
Open Journal of Inorganic Chemistry (OJIC) , 2012, DOI: 10.4236/ojic.2012.24011
Abstract: N, N, N′, N′-tetrakis-(2-benzimidazolylmethyl)-1, 2-ethanediamine(TBIMEDA), was prepared by reaction of ethylenediamine tetra-acetic acid disodium salt(EDTA) with 1, 2-diaminobenzene in a refluxed glycol solution, and furthermore, three allomeric complexes[(MIITBIMEDA) SO4·5H2O, M = Cd, Co, Ni] were selfassembled by solvothermal method based on reaction of this ligand with the relative sulfates respectively. These allomeric complexes were characterized by elemental analysis and IR spectroscopy and their crystal structures were determined by single crystal X-ray structural analysis. In the crystal architecture of these complexes, every metal(II) ion is chelated by one neutral TBIMEDA ligand to form an octahedral core with configuration of five heterocyclic rings (five- member ring). These cores then were linked to- gether by multi hydrogen bond interactions with sul- fate ions and water molecules to construct their 3D crystal architectures.
Assembly of Covalently Inorganic-Organic Hybrid Molecular Framework Based on Porphyrin and Phthalocyanine Derivatives—Sensitizer for Dye Sensitized Solar Cells  [PDF]
Hui Lin, Yahong Wu, Shanling Tong, Sheng Hu, Hengde Li, Chuanyi Pan, Yan Yan
Open Journal of Inorganic Chemistry (OJIC) , 2018, DOI: 10.4236/ojic.2018.81001
Abstract: The research on sensitizer for dye sensitized solar cells based on (metallo)porphyrin/phthalocyanine materials were reviewed, and experimental design and assembly method were advised. Latest progress and research status of sensitizer dyes based on metalloporphyrins applied in dye sensitized solar cells was summarized. The preparation and construction of sensitizer electrodes and dye sensitized solar cells based on metal organic frameworks (MOFs) of (metallo)porphyrin/phthalocyanine were projected.
Preparation of Single Substituted Phenyl Porphyrins Form Meso-Tetraphenyl Porphyrin-Synthetic Example from Symmetric Porphyrin into Asymmetric Porphyrins  [PDF]
Hui Lin, Xiaoting Chen, Yahong Wu, Shanling Tong, Sheng Hu, Jian Yu, Yan Yan
Open Journal of Inorganic Chemistry (OJIC) , 2018, DOI: 10.4236/ojic.2018.81002
Abstract: Two asymmetric porphyrins, 5-(4-chloromethylphenyl)-10, 15, 20-triphenyl porphyrin and 5-(4-formylphenyl)-10, 15, 20-triphenyl porphyrin, were successfully prepared by the symmetric meso-tetraphenyl porphyrin and relative molecular configurations and properties were characterized by spectral determinations. This work presented an example for synthesis of asymmetric porphyrin derivatives from the symmetric porphyrin. Both asymmetric porphyrins are reactive in molecular assembly, the concerned reactions including alkylation with Grignard reagents, etherification with alcohols, aldol condensation and Mannich reaction for modification and enhancing their functionality. In this work, the reaction conditions were improved, synthetic strategy and route were confirmed.
Bis{2-[(4-chlorophenyl)iminomethyl]pyrrol-1-ido-κ2N,N′}bis(dimethylamido-κN)titanium(IV) toluene monosolvate
Zhou Chen,Jian Wu,Yahong Li,Bin Hu
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812014961
Abstract: The mononuclear title compound, [Ti(C11H8ClN2)2(C2H6N)2]·C7H8, was synthesized by the reaction of N-(4-chlorophenyl)-2-pyrrolylcarbaldimine with Ti(C2H6N)4. The TiIV ion is situated on a twofold rotation axis and displays a distorted octahedral geometry defined by four N atoms from two 2-[(4-chlorophenyl)iminomethyl]pyrrol-1-ide ligands and two N atoms from two dimethylamine ligands. The Ti—Npyrrole bond length [2.1041 (19) ] is longer than the Ti—Ndimethylamine bond length [1.9013 (19) ]; the imine N atom exhibits the longest Ti—N bond [2.3152 (17) ]. The toluene solvent molecule is located on a twofold rotation axis running through the C atom of the methyl group. Consequently, the H atoms of the latter are rotationally disordered. The compound contains no markable hydrogen-bonding interactions.
Risk factors of inflammatory bowel disease in the North-Western Chinese population.
Yahong Li,Shengjun Wu,Jie Liang,Xia Zhu
Journal of Research in Medical Sciences , 2007,
Abstract: BACKGROUND: The aim of study was to screen the risk factors of inflammatory bowel disease (IBD) in north-western Chinese population by case investigation. METHODS: 72 determined IBD patients and 72 paired healthy subjects were surveyed with an organized inventory comprising of relevant items to IBD. Cox regression method was used to screen the statistically significant risk factors for IBD. RESULTS: Cox regression indicated the statistical significance in stress, milk and fried food over the other postulated risk factors for IBD in the north-western Chinese population. CONCLUSIONS: Stress, milk and fried food are the potential risk factors for IBD in the north-western Chinese population. KEY WORDS: Inflammatory bowel disease, north-western Chinese population, risk factors.
Flow characteristics and reaction properties of carbon dioxide in microtubules and porous media
RenBao Zhao,XiangAn Yue,YaHong Wu,ShaoLiang Xu,Fei Wang,YongLi Hou
Chinese Science Bulletin , 2008, DOI: 10.1007/s11434-008-0456-5
Abstract: Carbon dioxide reacts with porous media while flowing through them enhancing their permeability. Its flow behavior as well as the permeability enhancement effects were studied in synthetic cores, natural cores and microtubes with an inner diameter of 5 μm. The results show that the permeability of H2O-saturated cores (containing carbonate ingredients) was enhanced by increasing the injection volume of a CO2-H2O solution. This enhancement is attributable to carbon dioxide’s corrosion, which is justified by SEM scanning. The same phenomenon occurs with a CO2-H2O solution in microtubes, but for a different reason. The gas flow velocity of carbon dioxide in microtubes was approximately 100% faster than that of nitrogen because of the scale and the squeezing effects. Carbon dioxide molecules dissolved in water accelerate the diffusion rate of water molecules within the boundary layer, which in turn diminishes the thickness of the water film and enlarges the effective pore size. This flow behavior facilitates the injection of carbon dioxide into low-permeability reservoirs for oil-displacement and formation energy buildup purposes. This behavior also increases the potential for carbon dioxide channeling or release from the formation.
A capacity-maximization-based adaptive modulation and power allocation algorighm fo multicarrier systems

Zhao Yahong,Zhang Zhongpei,Wu Weiling,

电子与信息学报 , 2003,
Abstract: In this paper, the optimization of channel capacity (equivalent to data throughput) is proposed for variable-rate service, which is solved with the Lagrangian multiplier method based on a simplified BER formula for m-QAM modulation. The closed-form solution for the optimization problem is given and the practical constraint of positive power and modulation mode allocation is solved by null transmission on those deep-faded subcarriers. Finally discrete modulation mode (0, QPSK, 16QAM and 64QAM) is used to approach the optimally allocated continuous modulation mode, and simulation results demonstrate that the capacity loss from this approaching is negligible and QoS is guaranteed.
Biocompatibility studies of silk fibroin-based artificial nerve grafts in vitro and in vivo

Chen Xuemei,Yang Yumin,Wu Jian,Zhao Yahong,Ding Fei,Gu Xiaosong,

自然科学进展 , 2007,
Characterization and Synthesis through Fast Phase-Transfer of Oil-Soluble Double-Coordinated Tea-Polyphenols Arsenic  [PDF]
Wenfu Zhou, Yahong Chen, Lin Zhang
Journal of Biosciences and Medicines (JBM) , 2014, DOI: 10.4236/jbm.2014.25004
Abstract: Fast phase-transferring was adopted in ethanol solution at the condition of n (oil-soluble tea pol-yphenol): N (As3﹢) = 2:1, 4:1, 6:1, pH = 4.0, temperature 40°C - 45°C, action period of 15 h to compose the target, of which the productivity was 59%, UV was 267.50, 218.00, 220.50 nm, FTIR was 6291, 34158.6, 2850.2, 1708.2; 1457.3; 1370.4, 1224.2, 1144.0, 760.5 cm﹣1, fluorescence value λmax = 257, 591.1, 593.7, 590.3, 591.0, 591.5, XRD λ/nm is 3.6974, 4.186, 12.0762, 15.4747, 1H-NMRδ = 0.782, 1.193, 1.483 - 1.586, 1.959 - 2.184, 2.479, 3.116, 3.970 - 3.981, 5.231 - 5.753, 6.537 - 7.300. Finally it was ascertained through XRD as double-coordinated polycrystal compound.
The Time Distribution and Guide Analysis of Visiting Behavior of Tour ism Website User s

LU Zi,ZHAO Yahong,WU Shifeng,HAN Bing,

地理学报 , 2007,
Abstract: This paper obtained detailed data from many kinds of online survey systems and website traffic statistic tools. The data are summarized using time-distributing characteristics of the browsing behavior of tourism website visitors on daily, weekly and yearly bases. Under this condition, this paper analyzed the relationship of the traffic of tourism websites and the tourists. Four questions are researched: (1) the self characteristics of website, the comparison of China and foreign countries, and the comparison of southern and northern regions in China; (2) the comparison between the whole internet browsing with different kinds of websites browsing; (3) the comparison of the internet and tradition media; and (4) the guide of tourism website information flow to realistic tourists flow. The time-distributing characteristics of the browsing behavior of tourism website visitors on daily, weekly and yearly bases: Daily: (1) the characteristic is bimodal distribution, 10:00 am and 14:00 pm are the summit, and 20:00-22:00 pm is high frequency stage. The browsing time variation is different in China and other countries, and in northern and southern China. There is close connection in browsing behavior of users and their habits. (2) There are great differences in the browsing time-stage of tourism websites, the whole Internet and the main websites. (3) The time characteristic and reason of browsing behavior of users can be explained from the deep level of users' identity variable. (4) The browsing behavior of tourism websites is different from the looking and hearing behavior of TV media: the time-distributing of net media is dispersive, and the net-usage rate is higher beyond the golden stage. (5) Overall, the tourist traffic daily is the same with the usage trend of tourism websites. From time to time, the information flow does not guide to people flow. Weekly: (1) the self characteristic has no obvious difference in China and foreign countries, and in southern and northern regions. The time distribution of browsing behavior of users is low at weekends and high on weekdays. (2) There are similar characteristics and different characteristics when comparing the whole internet with other types of websites. The usage rate is low at weekends and high on weekdays, which is the same compared with other type websites, mainly because the users get some outdoor activities such as sport. (3) The usage type of tourism website appears "Z-shaped" distribution pattern, and the using trend of websites is complementary each other with tourist distribution. The browsing traffic of tourism website is high on weekdays and low at weekends, and people flow is low on weekdays and high at weekends. Yearly: (1) the self characteristic is the complicated multiple characteristic type. There are obvious differences between China and other countries, and between southern and northern regions. The traffic of websites that has no obvious regionality is the highest before golden week yea
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