The Experts below are selected from a list of 312 Experts worldwide ranked by ideXlab platform

Huili Shao - One of the best experts on this subject based on the ideXlab platform.

  • A study on the Flow Stability of regenerated silk fibroin aqueous solution.
    International Journal of Biological Macromolecules, 2005
    Co-Authors: Hong Wang, Yaopeng Zhang, Huili Shao
    Abstract:

    The Flow Stability of silk fibroin (SF) aqueous solutions with different concentrations under different temperatures was investigated. It was found that the Flow Stability decreased quickly with the increase of solution concentration and temperature. X-ray diffraction, Fourier transform infrared (FTIR) and Raman spectroscopy analysis showed that silk fibroin in aqueous solution was mainly in random coil and α-helix conformation. However, it turned into α-helix and β-sheet conformation after gelation, and both silk I and silk II crystalline structures appeared accordingly. The investigation implies that the original dilute regenerated SF aqueous solution should be stored under low temperature and concentrated just before spinning.

  • A study on the Flow Stability of regenerated silk fibroin aqueous solution.
    International journal of biological macromolecules, 2005
    Co-Authors: Hong Wang, Yaopeng Zhang, Huili Shao
    Abstract:

    The Flow Stability of silk fibroin (SF) aqueous solutions with different concentrations under different temperatures was investigated. It was found that the Flow Stability decreased quickly with the increase of solution concentration and temperature. X-ray diffraction, Fourier transform infrared (FTIR) and Raman spectroscopy analysis showed that silk fibroin in aqueous solution was mainly in random coil and alpha-helix conformation. However, it turned into alpha-helix and beta-sheet conformation after gelation, and both silk I and silk II crystalline structures appeared accordingly. The investigation implies that the original dilute regenerated SF aqueous solution should be stored under low temperature and concentrated just before spinning.

Hong Wang - One of the best experts on this subject based on the ideXlab platform.

  • The Reasonable Distance of Unsignalized Crosswalks Based on Traffic Flow, Stability, and Efficiency
    ICCTP 2009, 2009
    Co-Authors: Shunying Zhu, Jing Xia, Hong Wang, Bing Liu
    Abstract:

    The distance of midblock crosswalks directly influences traffic Flow Stability and operating efficiency. Considering the present situation of urban transportation in China, the reasonable distance of midblock unsignalized crosswalks was studied combined with the characteristics of vehicle traffic Flow and pedestrian Flow. In the peak hour traffic environment, eleven kinds of pedestrian crossing distance were designed (150m~400m, gap is 25m) in simulation model Vissim. Data of average speed time series, vehicular delay and pedestrian delay under time scales of 1s, 5s and 10s were obtained. The largest Lyapunov index of average speed time series was used to identify the influence of crosswalk distance over vehicle traffic Flow Stability. Vehicular delay and pedestrian delay were utilized to reflect the relationship among the distance of midblock crosswalks, vehicle Flow efficiency and pedestrian crossing efficiency. This research takes the midblock management mechanism into consideration, balances the relationship among traffic Flow Stability, efficiency and pedestrian efficiency, and puts forward the recommended midblock crosswalk distance.

  • A study on the Flow Stability of regenerated silk fibroin aqueous solution.
    International Journal of Biological Macromolecules, 2005
    Co-Authors: Hong Wang, Yaopeng Zhang, Huili Shao
    Abstract:

    The Flow Stability of silk fibroin (SF) aqueous solutions with different concentrations under different temperatures was investigated. It was found that the Flow Stability decreased quickly with the increase of solution concentration and temperature. X-ray diffraction, Fourier transform infrared (FTIR) and Raman spectroscopy analysis showed that silk fibroin in aqueous solution was mainly in random coil and α-helix conformation. However, it turned into α-helix and β-sheet conformation after gelation, and both silk I and silk II crystalline structures appeared accordingly. The investigation implies that the original dilute regenerated SF aqueous solution should be stored under low temperature and concentrated just before spinning.

  • A study on the Flow Stability of regenerated silk fibroin aqueous solution.
    International journal of biological macromolecules, 2005
    Co-Authors: Hong Wang, Yaopeng Zhang, Huili Shao
    Abstract:

    The Flow Stability of silk fibroin (SF) aqueous solutions with different concentrations under different temperatures was investigated. It was found that the Flow Stability decreased quickly with the increase of solution concentration and temperature. X-ray diffraction, Fourier transform infrared (FTIR) and Raman spectroscopy analysis showed that silk fibroin in aqueous solution was mainly in random coil and alpha-helix conformation. However, it turned into alpha-helix and beta-sheet conformation after gelation, and both silk I and silk II crystalline structures appeared accordingly. The investigation implies that the original dilute regenerated SF aqueous solution should be stored under low temperature and concentrated just before spinning.

Yaopeng Zhang - One of the best experts on this subject based on the ideXlab platform.

  • A study on the Flow Stability of regenerated silk fibroin aqueous solution.
    International Journal of Biological Macromolecules, 2005
    Co-Authors: Hong Wang, Yaopeng Zhang, Huili Shao
    Abstract:

    The Flow Stability of silk fibroin (SF) aqueous solutions with different concentrations under different temperatures was investigated. It was found that the Flow Stability decreased quickly with the increase of solution concentration and temperature. X-ray diffraction, Fourier transform infrared (FTIR) and Raman spectroscopy analysis showed that silk fibroin in aqueous solution was mainly in random coil and α-helix conformation. However, it turned into α-helix and β-sheet conformation after gelation, and both silk I and silk II crystalline structures appeared accordingly. The investigation implies that the original dilute regenerated SF aqueous solution should be stored under low temperature and concentrated just before spinning.

  • A study on the Flow Stability of regenerated silk fibroin aqueous solution.
    International journal of biological macromolecules, 2005
    Co-Authors: Hong Wang, Yaopeng Zhang, Huili Shao
    Abstract:

    The Flow Stability of silk fibroin (SF) aqueous solutions with different concentrations under different temperatures was investigated. It was found that the Flow Stability decreased quickly with the increase of solution concentration and temperature. X-ray diffraction, Fourier transform infrared (FTIR) and Raman spectroscopy analysis showed that silk fibroin in aqueous solution was mainly in random coil and alpha-helix conformation. However, it turned into alpha-helix and beta-sheet conformation after gelation, and both silk I and silk II crystalline structures appeared accordingly. The investigation implies that the original dilute regenerated SF aqueous solution should be stored under low temperature and concentrated just before spinning.

Peter J Wellmann - One of the best experts on this subject based on the ideXlab platform.

  • Flow Stability convective heat transfer and chemical reactions in ammonothermal autoclaves insights by in situ measurements of fluid temperatures
    Crystals, 2020
    Co-Authors: Saskia Schimmel, Ines Kobelt, Lukas Heinlein, Annacarina L Kimmel, Thomas G Steigerwald, Eberhard Schlucker, Peter J Wellmann
    Abstract:

    A variety of functional nitride materials, including the important wide bandgap semiconductor GaN, can be crystallized in exceptionally good structural quality by the ammonothermal method. However, the further development of this method is hindered by a lack of access to internal process parameters including fluid temperatures, Flow Stability and reaction kinetics. Internal temperature measurements are thus introduced as a tool for in situ monitoring of fluid Flow Stability in ammonothermal reactors as well as chemical reactions associated with enthalpy changes. The temperature change of an internal thermocouple is studied numerically in order to estimate possible errors due to heat conduction along thermocouples as well as due to their heat capacity. Results from otherwise identical experiments conducted with air at ambient pressure and ammonothermal reaction medium, respectively, are compared. The comparison indicates that internal temperature distributions during ammonothermal growth of GaN cannot be determined by measurements using ambient pressure air instead of supercritical ammonia. Even an approximate determination is not feasible, given that the internal temperature gradients differ by a factor of seven, and that the Grashof- and Rayleigh numbers differ by approximately four orders of magnitude. Most importantly, convective heat transfer by supercritical ammonia is found to greatly influence the temperature distribution inside the reaction chamber and its walls, suggesting that it probably needs to be taken into account in numerical simulations of the global thermal field of ammonothermal reactors.

Yh Yang - One of the best experts on this subject based on the ideXlab platform.

  • Flow Stability of Supercritical Water Cooled Systems
    2006
    Co-Authors: X Cheng, B Kuang, Yh Yang
    Abstract:

    Research activities are ongoing worldwide to develop nuclear power plants with supercritical water cooled reactor (SCWR) with the purpose to achieve a high thermal efficiency and to improve their economical competitiveness. However, the strong variation of the thermal-physical properties of water in the vicinity of the pseudo-critical line results in challenging tasks in thermal-hydraulic design of a SCWR. One of the challenging tasks is to understand and to predict the dynamic behavior and Flow Stability of supercritical water cooled systems. Although extensive thermal-hydraulic research activities have been carried out worldwide, studies on Flow Stability of SC water cooled systems are scarce. The present study deals with the Flow behavior of SC water cooled systems. For this purpose the computer code SASC was developed, which is applied to a simplified cooling system. The effect of various parameters on the Flow behavior is investigated. The first results achieved up to now reveals a complicated dynamic performance of a system cooled by supercritical water. (authors)

  • Investigation on Flow Stability of Supercritical Water Cooled Systems
    2006
    Co-Authors: X Cheng, B Kuang, Yh Yang
    Abstract:

    The supercritical pressure water cooled reactor (SCWR) offers the potential for high thermal efficiencies and considerable plant simplifications1. One of the main features of supercritical water is the strong variation of their thermal-physical properties in the vicinity of the pseudo-critical line. This large variation of thermal-physical properties, especially the density variation, results in a serious concern of Flow inStability. Flow Stability is a crucial issue in the design and operation of SCW cooled systems. Theoretical investigations of the Flow Stability of supercritical fluids go back to the work of Zuber. In the cryogenic application, Flow inStability has also been intensively investigated for thermal-hydraulic systems cooled by supercritical fluids, e.g. supercritical helium3. In the frame of the development of supercritical CANDU (CANDU-X) reactors, Stability of supercritical water Flow in a single channel under natural circulation conditions was investigated by Chatoorgoon4. In that paper, supercritical Flow Stability was examined using a non-linear numerical code. In addition, a theoretical Stability criterion is also established to verify the numerical prediction. This theoretical model is based on the assumption of zero gradient of mass Flow by the heat power. However, the availability of this assumption is not proven, even for natural circulation loop. In the present paper, the new computer code SASC (System Analyzer of Super-Critical fluid Flows) has been developed. This code is applied to a simplified system cooled with supercritical water. The effect of various parameters on the Flow behavior and Flow Stability has been studied.