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Tian Wei,Hu Fang,Zhou Xiuneng 한국조직공학과 재생의학회 2021 조직공학과 재생의학 Vol.18 No.6
Background: The long-term stability for both the patient and periodontist remains an important priority after connective tissue graft to manage the gingival recession cases. The goal of this analysis was to assess and compare the connective tissue graft with Pouch/Tunnel technique versus connective tissue graft with coronally advanced tunnel flap for the treatment of maxillary recession cases in severe periodontitis. Methods: The total sample size was comprised of 200 subjects. The control group, coronally advanced flap along with connective tissue graft (CTG) was comprised of 100 samples and test group, pouch/tunnel technique with connective tissue graft (POT + CTG) was also comprised of 100 samples. The clinical findings included medium root coverage (MRC) and absolute root (CRC) coverage, gingival (GT) distribution and keratinized tissue (KT) gain. Esthetic findings were also evaluated. All findings analyzed initially after 6th months and have been expanded to 4 years. Results: There were no major variations between the MRC and CRC patient classes with non significant values. In the POT + CTG category, GT and KT improvements were slightly greater at 4 years, with a substantial improvement in texture in control group. Conclusion: Pouch/Tunnel technique along with connective tissue graft allows for the clinical coverage of gingival recessions that is equivalent to Coronally advanced flap with CTG, however this may improves the gingival thickness, KT and esthetic performance.
Tianwei Tan,Zheng Wang,Liyang Zhang 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.6
This paper describes a fed-batch fermentation protocol about production of selenium-enriched yeast. Saccharomyces cerevisiae GS2 was selected because of its high tolerance to selenium. The strain GS2 was tested and 122±0.5 g·l−1 dry cell weight was obtained after 30 h cultivation through feed back control of feed rate of glucose according to the concentration of ethanol and dissolved oxygen. Furthermore, the optimal pattern of Na2SeO3 addition was 9 mg Na2SeO3 against 1 g DCW at late exponential phase. With the combination of glucose feeding and Na2SeO3 addition,the final dry cell biomass reached 102±0.4 g·l−1 and a Se uptake level of 2,020±13 mg·Kg−1 was achieved in a 5 l fermentor after 38 h cultivation.
Development and Analysis of Negative Stiffness Friction Damping Device
Tianwei Sun,Lingyun Peng,Xiaojun Li,Yingjie Kang,Yuke Deng 대한토목학회 2021 KSCE Journal of Civil Engineering Vol.25 No.7
A new type of negative stiffness friction damping device (NSFDD) was developed in this study, which can solve the problem of poor energy dissipation of the existing passive negative stiffness damping device. The friction force is generated by squeezing the friction plate with the preloaded nitrogen spring vertically. When the NSFDD is working, the friction plate causes the nitrogen spring to rotate and negative stiffness force and friction force are generated. The results of the performance test show that the NSFDD can achieve negative stiffness in the hysteretic model. Comparing with the existing negative stiffness device, the NSFDD has larger stroke, more stable negative stiffness and better energy dissipation capacity. The finite element software has been used to simulate the low cycle reciprocation of a structure, and the results show that the NSFDD reduces the stiffness of the structure while increasing the damping of the structure. The results of the simulation and analysis of the shock absorption plan of the NSFDD show that the NSFDD reduces the stiffness of the floor, thereby effectively control on the shear force, displacement and acceleration response of the structure.
Elastro-hydrodynamic lubrication model of multi-decked foil thrust bearing with copper wire support
Tianwei Lai,Yu Guo,Wei Wang,Shuangtao Chen,Yu Hou 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.9
Copper wire supported foil thrust bearing (CWFTB), which can be applied in high speed turbo-expander, adopts underlying flat foil as elastic supporting that interconnected with copper wires. In this paper, finite element model of the thrust bearing is developed incorporating the fluid film and foil deflections. Fluid-structure interaction (FSI) is realized through serial solution of the fluid Reynolds equation and the plate Kirchhoff equation. Pressure profile of the gas film and deflections of the top foil and bottom foil are obtained through iteration. Static bearing performance such as bearing load and friction torque of the bearing are evaluated concerning bearing configuration such as taper/land ratio, taper height and copper wire arrangements. The finite element numerical results are validated with data from experiments.
He Tianwei 아시아경찰학회 2006 아시아경찰학회 국제학술회의 Vol.2006 No.-
Inadequate police strength is a long-standing problem of the public security departments, of grass root level public security departments in particular. In this paper, the impact and reasons of inadequate police strength on public security work are analyzed, basic principle on scientific setup of police strength resources are put forward. And based on scientific development concept, the paper also points out that the only way out is to intensify the reform, scientifically optimize the setup of police strength resource, effectively develop the potential of police strength resource, and continuously improve the efficiency of police affairs.
GAS OF 96 PLANCK COLD CLUMPS IN THE SECOND QUADRANT
Zhang, Tianwei,Wu, Yuefang,Liu, Tie,Meng, Fanyi American Astronomical Society 2016 The Astrophysical journal Supplement series Vol.224 No.2
<P>Ninety-six Planck cold dust clumps in the second quadrant were mapped with (CO)-C-12 (1-0), (CO)-C-13 (1-0), and (CO)-O-18 (1-0) lines at the 13.7 m telescope of Purple Mountain Observatory. (CO)-C-12 (1-0) and (CO)-C-13 (1-0) emissions were detected for all 96 clumps, while (CO)-O-18. (1-0) emissions were detected in 81 of them. Fifteen clumps have more than one velocity component. In the 115 mapped velocity components, 225 cores were obtained. We found that 23.1% of the cores have non-Gaussian profiles. We acquired the V-lsr, FWHM, and T-A of the lines. Distances, T-ex, velocity dispersions, N-H2, and masses were also derived. Generally, turbulence may dominant the cores because sigma(NT)/sigma(Therm) > 1 in almost all of the cores and Larson's relationship is not apparent in our massive cores. Virial parameters are adopted to test the gravitational stability of cores and 51% of the cores are likely collapsing. The core mass function of the cores in the range 0-1 kpc suggests a low core-to-star conversional efficiency (0.62%). Only 14 of 225 cores (6.2%) have associated stellar objects at their centers, while the others are starless. The morphologies of clumps are mainly filamentary structures. Seven clumps may be located on an extension of the new spiral arm in the second quadrant while three are on the known outer arm.</P>
Hongyan Huo,Tianwei Tan,Haijia Su 한국생물공학회 2008 Biotechnology and Bioprocess Engineering Vol.13 No.1
The complex technology of molecular imprinting with a photocatalytic reaction introduces novel ways of treating industrial and living sewage. This paper deals with the effects of trace TiO2 on Ag+-imprinted or non-imprinted adsorbents. NanoTiO2 was added during the preparation of the adsorbents. The performance of these adsorbents was compared with other common adsorbents, such as activated carbon and chitosan. TiO2 loading improved the adsorption ability for Ag+ of adsorbents. Adsorption equilibrium could be rapidly achieved at an initial Ag+ concentration of 200 mg/L under different light conditions (UV, visible light, and dark). After TiO2 loading, the maximal adsorption capacity of Ag+-imprinted and non-imprinted adsorb-ents was 25.0% higher, at 155.0 and 134.3 mg/g, respectively, at the initial Ag+ concentration of 1,000 mg/L. In order to understand the binding state of Ag, Ti on the adsorbents surface, FTIR, XPS were measured. The FTIR analysis, before and after adding TiO2, indicated that TiO2 bound with adsorbents through hydrogen bonding. XPS analysis, before and after adsorption, indicated Ag+ was reduced to Ag0 on the adsorbent surface, leading to an increased adsorption of Ag+.