The Experts below are selected from a list of 529677 Experts worldwide ranked by ideXlab platform

Akira Harada - One of the best experts on this subject based on the ideXlab platform.

  • Highly Flexible, Tough, and Self-Healing Supramolecular Polymeric Materials Using Host–Guest Interaction
    Macromolecular Rapid Communications, 2015
    Co-Authors: Masaki Nakahata, Yoshinori Takashima, Akira Harada
    Abstract:

    Flexible, tough, and self-healable polymeric materials are promising to be a solution to the Energy Problem by substituting for conventional heavy materials. A fusion of supramolecular chemistry and polymer chemistry is a powerful method to create such intelligent materials. Here, a supramolecular polymeric material using multipoint molecular recognition between cyclodextrin (CD) and hydrophobic guest molecules at polymer side chain is reported. A transparent, flexible, and tough hydrogel (host–guest gel) is formed by a simple preparation procedure. The host–guest gel shows self-healing property in both wet state and dry state due to reversible nature of host–guest interaction. The practical utility of the host–guest gel as a scratch curable coating is demonstrated.

  • Highly Flexible, Tough, and Self‐Healing Supramolecular Polymeric Materials Using Host–Guest Interaction
    Macromolecular Rapid Communications, 2015
    Co-Authors: Masaki Nakahata, Yoshinori Takashima, Akira Harada
    Abstract:

    Flexible, tough, and self-healable polymeric materials are promising to be a solution to the Energy Problem by substituting for conventional heavy materials. A fusion of supramolecular chemistry and polymer chemistry is a powerful method to create such intelligent materials. Here, a supramolecular polymeric material using multipoint molecular recognition between cyclodextrin (CD) and hydrophobic guest molecules at polymer side chain is reported. A transparent, flexible, and tough hydrogel (host–guest gel) is formed by a simple preparation procedure. The host–guest gel shows self-healing property in both wet state and dry state due to reversible nature of host–guest interaction. The practical utility of the host–guest gel as a scratch curable coating is demonstrated.

Tirthabir Biswas - One of the best experts on this subject based on the ideXlab platform.

  • swiss cheese inhomogeneous cosmology and the dark Energy Problem
    Journal of Cosmology and Astroparticle Physics, 2008
    Co-Authors: Tirthabir Biswas, Alessio Notari
    Abstract:

    We study an exact Swiss-cheese model of the universe, where inhomogeneous LTB patches are embedded in a flat FLRW background, in order to see how observations of distant sources are affected. We focus mainly on the redshift, both perturbatively and non-perturbatively: the net effect given by one patch is suppressed by (L/RH)3 (where L is the size of one patch and RH is the Hubble radius). We disentangle this effect from the Doppler term (which is much larger and has been used recently (Biswas et al 2007 J. Cosmol. Astropart. Phys. JCAP12(2007)017 [astro-ph/0606703]) to try to fit the SN curve without dark Energy) by making contact with cosmological perturbation theory. Then, the correction to the angular distance is discussed analytically and estimated to be larger, , perturbatively and non-perturbatively (although it should go to zero after angular averaging).

  • swiss cheese inhomogeneous cosmology the dark Energy Problem
    arXiv: Astrophysics, 2007
    Co-Authors: Tirthabir Biswas, Alessio Notari
    Abstract:

    We study an exact swiss-cheese model of the Universe, where inhomogeneous LTB patches are embedded in a flat FLRW background, in order to see how observations of distant sources are affected. We find negligible integrated effect, suppressed by (L/R_{H})^3 (where L is the size of one patch, and R_{H} is the Hubble radius), both perturbatively and non-perturbatively. We disentangle this effect from the Doppler term (which is much larger and has been used recently \cite{BMN} to try to fit the SN curve without dark Energy) by making contact with cosmological perturbation theory.

Alessio Notari - One of the best experts on this subject based on the ideXlab platform.

  • swiss cheese inhomogeneous cosmology and the dark Energy Problem
    Journal of Cosmology and Astroparticle Physics, 2008
    Co-Authors: Tirthabir Biswas, Alessio Notari
    Abstract:

    We study an exact Swiss-cheese model of the universe, where inhomogeneous LTB patches are embedded in a flat FLRW background, in order to see how observations of distant sources are affected. We focus mainly on the redshift, both perturbatively and non-perturbatively: the net effect given by one patch is suppressed by (L/RH)3 (where L is the size of one patch and RH is the Hubble radius). We disentangle this effect from the Doppler term (which is much larger and has been used recently (Biswas et al 2007 J. Cosmol. Astropart. Phys. JCAP12(2007)017 [astro-ph/0606703]) to try to fit the SN curve without dark Energy) by making contact with cosmological perturbation theory. Then, the correction to the angular distance is discussed analytically and estimated to be larger, , perturbatively and non-perturbatively (although it should go to zero after angular averaging).

  • swiss cheese inhomogeneous cosmology the dark Energy Problem
    arXiv: Astrophysics, 2007
    Co-Authors: Tirthabir Biswas, Alessio Notari
    Abstract:

    We study an exact swiss-cheese model of the Universe, where inhomogeneous LTB patches are embedded in a flat FLRW background, in order to see how observations of distant sources are affected. We find negligible integrated effect, suppressed by (L/R_{H})^3 (where L is the size of one patch, and R_{H} is the Hubble radius), both perturbatively and non-perturbatively. We disentangle this effect from the Doppler term (which is much larger and has been used recently \cite{BMN} to try to fit the SN curve without dark Energy) by making contact with cosmological perturbation theory.

Masaki Nakahata - One of the best experts on this subject based on the ideXlab platform.

  • Highly Flexible, Tough, and Self-Healing Supramolecular Polymeric Materials Using Host–Guest Interaction
    Macromolecular Rapid Communications, 2015
    Co-Authors: Masaki Nakahata, Yoshinori Takashima, Akira Harada
    Abstract:

    Flexible, tough, and self-healable polymeric materials are promising to be a solution to the Energy Problem by substituting for conventional heavy materials. A fusion of supramolecular chemistry and polymer chemistry is a powerful method to create such intelligent materials. Here, a supramolecular polymeric material using multipoint molecular recognition between cyclodextrin (CD) and hydrophobic guest molecules at polymer side chain is reported. A transparent, flexible, and tough hydrogel (host–guest gel) is formed by a simple preparation procedure. The host–guest gel shows self-healing property in both wet state and dry state due to reversible nature of host–guest interaction. The practical utility of the host–guest gel as a scratch curable coating is demonstrated.

  • Highly Flexible, Tough, and Self‐Healing Supramolecular Polymeric Materials Using Host–Guest Interaction
    Macromolecular Rapid Communications, 2015
    Co-Authors: Masaki Nakahata, Yoshinori Takashima, Akira Harada
    Abstract:

    Flexible, tough, and self-healable polymeric materials are promising to be a solution to the Energy Problem by substituting for conventional heavy materials. A fusion of supramolecular chemistry and polymer chemistry is a powerful method to create such intelligent materials. Here, a supramolecular polymeric material using multipoint molecular recognition between cyclodextrin (CD) and hydrophobic guest molecules at polymer side chain is reported. A transparent, flexible, and tough hydrogel (host–guest gel) is formed by a simple preparation procedure. The host–guest gel shows self-healing property in both wet state and dry state due to reversible nature of host–guest interaction. The practical utility of the host–guest gel as a scratch curable coating is demonstrated.

Kangwen Sun - One of the best experts on this subject based on the ideXlab platform.

  • a theoretical study of rotatable renewable Energy system for stratospheric airship
    Energy Conversion and Management, 2017
    Co-Authors: Mingyun Lv, Weiyu Zhu, Huafei Du, Junhui Meng, Jun Li, Kangwen Sun
    Abstract:

    Abstract Renewable Energy system is very critical for solving the Energy Problem of a long endurance stratospheric airship. Output performance of the traditional solar array fixed on the upper surface of the airship remains to be improved to reduce the area and weight of renewable Energy system. Inspired by the solar tracking system and kirigami, a rotatable renewable Energy system (mainly including solar array) is designed to improve the current status of the Energy system. The advantages of the rotatable solar array are studied using a MATLAB computer program based on the theoretical model established in this paper. The improvements in output Energy and required area of the solar array were compared between the traditional airship and improved one. Studies had shown that the rotatable renewable Energy system made the total weight of Energy system decreased by 1000 kg when the maximum design speed of the airship was greater than 22 m/s. The results demonstrate that the rotatable renewable Energy system for the airship can be a good way to improve the output performance of solar array, and the conceptual design and theoretical model suggest a pathway towards solving the Energy Problem of a stratospheric airship.

  • output performance analyses of solar array on stratospheric airship with thermal effect
    Applied Thermal Engineering, 2016
    Co-Authors: Jun Li, Dongjie Tan, Mingyun Lv, Weiyu Zhu, Kangwen Sun, Yuanyuan Zhang
    Abstract:

    Abstract Output performance analyses of the solar array are very critical for solving the Energy Problem of a long endurance stratospheric airship, and the solar cell efficiency is very sensitive to temperature of the solar cell. But the research about output performance of solar array with thermal effect is rare. This paper outlines a numerical model including the thermal model of airship and solar cells, the incident solar radiation model on the solar array, and the power output model. Based on this numerical model, a MATLAB computer program is developed. In the course of the investigation, the comparisons of the simulation results with and without considering thermal effect are reported. Furthermore, effects of the transmissivity of external encapsulation layer of solar array and wind speed on the thermal performance and output power of solar array are discussed in detail. The results indicate that this method is helpful for planning Energy management.