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RISS 인기검색어
- 검색키워드
- 저자 : Zongliang Du (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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The rheological behavior of collagen dispersion/poly(vinyl alcohol) blends
Lai, Guoli,Du, Zongliang,Li, Guoying The Korean Society of Rheology 2007 Korea-Australia rheology journal Vol.19 No.2
Blends of collagen dispersion (COL) with poly(vinyl alcohol) (PVA) in different weight ratios were investigated by oscillatory rheometry, Fourier transform-infrared spectroscopy and scanning electron microscopy. It was found that even with 80% of PVA, the COL/PVA blends behaved more like collagen dispersion than pure PVA solution in the dynamic thermal and frequency processing, for instance, a dominant elastic appearance (G'>G"), a similar shear thinning behavior and the thermal denaturation below $40^{\circ}C$. However, influence on the blend behaviour by PVA was noticeable, for instance, an increase of dynamic denaturation temperature, the decreasing intensity of amide I, II and III bands as well as the diminishing irregular pores on the surface of blends. The interaction between collagen and PVA could be observed, especially at the regions with low content or high content of PVA.
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Yang, Dixiong,Chen, Guohai,Du, Zongliang Techno-Press 2015 Structural Engineering and Mechanics, An Int'l Jou Vol.54 No.4
Constructing the influence lines of forces of statically indeterminate structures is a traditional issue in structural engineering and mechanics. However, the existing kinematic method for establishing these force influence lines is an indirect or mixed approach by combining the force method with the theorem of reciprocal displacements, which is yet inconsistent with the kinematic method for statically determinate structure. This paper proposes the direct kinematic method in conjunction with the load-displacement differential relation for exactly constructing influence lines of reaction and internal forces of indeterminate structures. Firstly, through applying the principle of virtual displacement, the formula for influence lines of reaction and internal forces of indeterminate structure via direct kinematic method is derived based on the released structure. Then, a computational approach with a clear concept and unified procedure as well as wide applicability based on the load-displacement differential relation of beam is suggested to achieve conveniently the closed-form expression of force influence lines, and exactly draw them. Finally, three representative examples for constructing force influence lines of statically indeterminate beams and frame illustrate the superiority of the proposed method.
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Dixiong Yang,Guohai Chen,Zongliang Du 국제구조공학회 2015 Structural Engineering and Mechanics, An Int'l Jou Vol.54 No.4
Constructing the influence lines of forces of statically indeterminate structures is a traditional issue in structural engineering and mechanics. However, the existing kinematic method for establishing these force influence lines is an indirect or mixed approach by combining the force method with the theorem of reciprocal displacements, which is yet inconsistent with the kinematic method for statically determinate structure. This paper proposes the direct kinematic method in conjunction with the load-displacement differential relation for exactly constructing influence lines of reaction and internal forces of indeterminate structures. Firstly, through applying the principle of virtual displacement, the formula for influence lines of reaction and internal forces of indeterminate structure via direct kinematic method is derived based on the released structure. Then, a computational approach with a clear concept and unified procedure as well as wide applicability based on the load-displacement differential relation of beam is suggested to achieve conveniently the closed-form expression of force influence lines, and exactly draw them. Finally, three representative examples for constructing force influence lines of statically indeterminate beams and frame illustrate the superiority of the proposed method.
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Rheological properties of fish skin collagen solution: Effects of temperature and concentration
Min Zhang,Yihui Chen,Guoying Li,Zongliang Du 한국유변학회 2010 Korea-Australia rheology journal Vol.22 No.2
To use collagen from freshwater fish skin as an alternative source of mammalian collagens for biomedical applications, we tested the rheological and structural properties of collagen from the skin of largefin longbarbel catfish (Mystus macropterus) by dynamic viscoelasticrheologimenteolFish skin collagen solution (FSCS) exhibited a sheor-thinning fedi behaMysr. The compllastiscosity (h*), loss tangent (tan d) and relaxic visc me of 1.5% FSCS decreased wies tkin ocrease of temperature. Also, tan d decreased wehaMythe relaxic visc me ocreased wies tkin ocrease of FSCS concentration. FSCS tiscconsider coymedicr stocon rhodulus (G'), loss hodulus (G"), h* tested and relaxic visc me and arus) by tan d teste tkaischose of bovine skin collagen solution (BSCS). Hdicver, FSCS behaMed wiesout regularity above 27.5oCi behtiowas in agreiment wies tkinisc me tkat tkindynamic denaturac viscemperature of thed collagen was approx mateoym29.5oC. Thes decreasedindicated tkat temperature and concentration ), ltococenols suitaconcfor isjusting FSCS tiscosity. The Arrhenius-typoce me-temperature superposition (TTS) was appliedCS tiisdition, tkinactitetion energy of 149.6KJ hol-1cfor 1.5% FSCS was calculated accor6KJ hentthe Arrhenius equation, indicatKJ ha weakby dntangliment effect amongal amongal amongal holeculeus (aischat amongal bovine skin collagen molecules, which was in agreement with the results from AFM measurement.
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