http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Ning-Ning Ji,Zhi-Qiang Shi,Ren-Gao Zhao,Ze-Bao Zheng,Zhi-Feng Li 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.4
A novel Schiff base N-(2,4-dinitro-phenyl)-N'-(1-phenyl-ethylidene)-hydrazine has been synthesized and structurally characterized by X-ray single crystal diffraction, elemental analysis, IR spectra and UV-vis spectrum. The crystal belongs to monoclinic with space group P21/n. The molecules are connected via intermolecular O-H···O hydrogen bonds into 1D infinite chains. The crystal structure is consolidated by the intramolecular N-H···O hydrogen bonds. weak intermolecular C-H···O hydrogen bonds link the molecules into intriguing 3D framework. Furthermore, Density functional theory (DFT) calculations of the structure, stabilities, orbital energies, composition characteristics of some frontier molecular orbitals and Mulliken charge distributions of the title compound were performed by means of Gaussian 03W package and taking B3LYP/6-31G(d) basis set. The time-dependent DFT calculations have been employed to calculate the electronic spectrum of the title compound, and the UV-vis spectra has been discussed on this basis. The results show that DFT method at B3LYP/6-31G(d) level can well reproduce the structure of the title compound.
Ji, Ning-Ning,Shi, Zhi-Qiang,Zhao, Ren-Gao,Zheng, Ze-Bao,Li, Zhi-Feng Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.4
A novel Schiff base N-(2,4-dinitro-phenyl)-N'-(1-phenyl-ethylidene)-hydrazine has been synthesized and structurally characterized by X-ray single crystal diffraction, elemental analysis, IR spectra and UV-vis spectrum. The crystal belongs to monoclinic with space group P21/n. The molecules are connected via intermolecular O-$H{\cdots}O$ hydrogen bonds into 1D infinite chains. The crystal structure is consolidated by the intramolecular N-$H{\cdots}O$ hydrogen bonds. weak intermolecular C-$H{\cdots}O$ hydrogen bonds link the molecules into intriguing 3D framework. Furthermore, Density functional theory (DFT) calculations of the structure, stabilities, orbital energies, composition characteristics of some frontier molecular orbitals and Mulliken charge distributions of the title compound were performed by means of Gaussian 03W package and taking B3LYP/6-31G(d) basis set. The time-dependent DFT calculations have been employed to calculate the electronic spectrum of the title compound, and the UV-vis spectra has been discussed on this basis. The results show that DFT method at B3LYP/6-31G(d) level can well reproduce the structure of the title compound.
Baseline-free damage detection method for beam structures based on an actual influence line
Ning-Bo Wang,Wei-Xin Ren,Tian-Li Huang 국제구조공학회 2019 Smart Structures and Systems, An International Jou Vol.24 No.4
The detection of structural damage without a priori information on the healthy state is challenging. In order to address the issue, the study presents a baseline-free approach to detect damage in beam structures based on an actual influence line. In particular, a multi-segment function-fitting calculation is developed to extract the actual deflection influence line (DIL) of a damaged beam from bridge responses due to a passing vehicle. An intact basis function based on the measurement position is introduced. The damage index is defined as the difference between the actual DIL and a constructed function related to the intact basis, and the damage location is indicated based on the local peak value of the damage index curve. The damage basis function is formulated by using the detected damage location. Based on the intact and damage basis functions, damage severity is quantified by fitting the actual DIL using the least-square calculation. Both numerical and experimental examples are provided to investigate the feasibility of the proposed method. The results indicate that the present baseline-free approach is effective in detecting the damage of beam structures.
Wavelet-based automatic identification method of axle distribution information
Ning-Bo Wang,Wei-Xin Ren,Zhi-Wei Chen 국제구조공학회 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.63 No.6
Accurately extracting the axle distribution information of a passing vehicle from bridge dynamic responses experiences a key and challenging step in non-pavement bridge weigh-in-motion (BWIM). In this article, the wavelet transformation is adopted and the wavelet coefficient curve is used as a substitute for dynamic response. The driving frequency is introduced and expanded to multi-axle vehicle, and the wavelet coefficient curve on specific scale corresponding to the driving frequency is confirmed to contain obvious axle information. On this basis, an automatic method for axle distribution information identification is proposed. The specific wavelet scale can be obtained through iterative computing, and the false peaks due to bridge vibration can be eliminated through cross-correlation analysis of the wavelet coefficients of two measure points. The integrand function that corresponds to the maximum value of the cross-correlation function is used to identify the peaks caused by axles. A numerical application of the proposed axle information identification method is carried out. Numerical results demonstrate that this method acquires precise axle information from the responses of an axle-insensitive structure (e.g., girder) and decreases the requirement of sensitivity structure of BWIM. Finally, an experimental study on a full-scale simply supported bridge is also conducted to verify the effectiveness of this method.
Ren, Hong-Xuan,Chen, Xing,Huang, Xing-Jiu,Im, Maesoon,Kim, Dong-Haan,Lee, Joo-Hyung,Yoon, Jun-Bo,Gu, Ning,Liu, Jin-Huai,Choi, Yang-Kyu Royal Society of Chemistry 2009 Lab on a chip Vol.9 No.15
<P>We use a conventional and straightforward route to fabricate scalable morphology-controlled regular structures. This route is based on the etching of PDMS microlens array in CF<SUB>4</SUB> and CF<SUB>4</SUB>/O<SUB>2</SUB> plasma. PDMS microlens array can be changed to regularly isolated microdot structures array in CF<SUB>4</SUB> plasma. Microbowl shaped structures array can be reached in CF<SUB>4</SUB>/O<SUB>2</SUB> plasma. Moreover, a set of structures after CF<SUB>4</SUB> plasma treatment display superhydrophobicity, while a set of structures after CF<SUB>4</SUB>/O<SUB>2</SUB> plasma treatment present hydrophilicity. DNA molecules can be readily enriched on the hydrophilic surface. We believe that the regular structure array surfaces provide a useful inspiration towards biomolecular detection and transportation in biochips.</P> <P>Graphic Abstract</P><P>Morphology-controlled regular structures and their opposite wettabilities can be obtained based on the etching of PDMS microlens array in CF<SUB>4</SUB> and CF<SUB>4</SUB>/O<SUB>2</SUB> plasma. DNA molecules enrichment is also investigated. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b905804d'> </P>
Ultrasonic method for measuring the gas holdup of gas-liquid bubbly flow in a small-diameter pipe
Ning-De Jin,Zheng Gong,An Zhao,Lu-Sheng Zhai,Ying-Yu Ren 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.4
Based on ultrasonic sound pressure attenuation, the ultrasonic pulse transmission method is proposed for measuring gas holdup in gas-liquid two-phase bubbly flows. Two ultrasonic transducers are positioned on opposite sides of a vertical upward pipe with an inner diameter of 20 mm. To obtain the relationship between ultrasonic attenuation and gas holdup, the mean value of the first pulse sequence of ultrasonic signals is first extracted as the measured signal. We used the quick closing valve method to obtain the gas holdup as the set value. Second, the relationship between the gas holdup and measured ultrasonic signals was established. The experiment result shows that the ultrasonic attenuation rate is significantly different at low and high gas holdups, as indicated by the bubble size images with a high-speed camera. We also investigated the ultrasonic field distribution using numerical simulation. The bubble size has an important effect on the ultrasonic attenuation coefficient, which provides a further physical explanation and reference for the experimental phenomena.
Xiao Ning Liu,양철중,김지의,Zhen Wu Du,Ming Ren,Wei Zhang,Hong Yu Zhao,김경옥,노규철 대한정형외과학회 2018 Clinics in Orthopedic Surgery Vol.10 No.1
Background: To evaluate the influence of bone marrow aspirate concentrate (BMAC) on tendon-to-bone healing in a rabbit rotator cuff model and to characterize the composition of growth factors in BMAC. Methods: In this in vivo study, 40 rabbits were allocated into five groups: control (C), repair + saline (RS), repair + platelet-rich plasma (PRP; RP), repair + BMAC (RB) and repair + PRP + BMAC (RPB). A tear model was created by supraspinatus tendon transection at the footprint. Six weeks after transection, the torn tendon was repaired along with BMAC or PRP administration. Six weeks after repair, shoulder samples were harvested for biomechanical and histological testing. Ten rabbits were used for processing PRP and BMAC, followed by analysis of blood cell composition and the levels of growth factors in vitro . Results: The ultimate load-to-failure was significantly higher in RPB group compared to RS group (p = 0.025). BMAC-treated groups showed higher values of biomechanical properties than RS group. The histology of BMAC-treated samples showed better collagen fiber continuity and orientation than RS group. BMAC contained significantly higher levels of the several growth factors than PRP. Conclusions: Locally administered BMAC enhanced tendon-to-bone healing and has potential for clinical applications.