A solitary wave propagation of deoxyribonucleic acid(DNA)double helices has been *** stretch of the hydrogen bonds is considered as a nonlinear chain with cubic and quartic *** solitary wave solution can be obtained b...
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A solitary wave propagation of deoxyribonucleic acid(DNA)double helices has been *** stretch of the hydrogen bonds is considered as a nonlinear chain with cubic and quartic *** solitary wave solution can be obtained by using a homogeneous balance *** characteristic parameters of solitary wave,such as the stretch amplitude and width are *** is shown that the conformational transitions from B-DNA to A-DNA can occur in a certain condition.
The rust layer plays an important role in the corrosion of steel in chlorinated environments. Salt spray, po- tentiodynamic polarization curve and tensile test were conducted in laboratory for the specimens after two-...
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The rust layer plays an important role in the corrosion of steel in chlorinated environments. Salt spray, po- tentiodynamic polarization curve and tensile test were conducted in laboratory for the specimens after two-stage heat treatment. The influence of the alloying elements on mechanical properties and corrosion resistance of three kinds of steels was investigated by observing the microstructure and the morphologies of rust layer. The results show that the highest value （29%） of total elongation for steel A is obtained. The mechanical property of the specimen for steel C exhibits best strength ductility balance （21 384 MPa ·%） because of the presence of the multiphase microstructures after a two-stage heat treatment and the addition of the alloying elements. The corrosion products are known to be a complex mixture of Fe3O4 , Fe2O3 and α-FeOOH for steel C. The presence of the alloying elements results in the for mation of compact and dense rust layers in steel B and C. Passive film protects the substrate of TRIP （transformation induced plasticity） steel containing a complex mix of multiphase. Superior corrosion performance is exhibited for steel C with low alloying contents due to the enrichment of alloying elements within the rust layers.
The local conformational behavior of deoxyribonucleic acid(DNA)has been discussed by considering the electron-electron *** set up the coupled nonlinear equations to describe the interaction between the longitudinal di...
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The local conformational behavior of deoxyribonucleic acid(DNA)has been discussed by considering the electron-electron *** set up the coupled nonlinear equations to describe the interaction between the longitudinal displacement of DNA backbone and the electronic wave *** the case of approximated condition,we obtain the analytic solution of the electronic wave function and longitudinal *** influence of electron-electron interaction upon the parameters of conformational soliton such as the amplitude and width have been *** the increasing of electron-electron interaction,the amplitude and half-width will increase.
We have presented the electronic free energy with respect to the magnetization and the model of the electronic density of *** expression of the giant magnetore-sist^nce has been obtained by considering the spin splitt...
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We have presented the electronic free energy with respect to the magnetization and the model of the electronic density of *** expression of the giant magnetore-sist^nce has been obtained by considering the spin splitting of the electronic energy *** approach explained the temperature effect on the giant magnetoresistancG in magnetic multilayers.
A new composite material was fabricated by intercalating tin nanoparticles into graphite. The tin graphite intercalation compound（Sn-GIC） was prepared by the interactions of tin tetrachloride with KC8 （K-GIC） in t...
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A new composite material was fabricated by intercalating tin nanoparticles into graphite. The tin graphite intercalation compound（Sn-GIC） was prepared by the interactions of tin tetrachloride with KC8 （K-GIC） in tetrahydrofuran （THF）. As the anode of lithium ion batteries, Sn-GIC presents a steady reversible capacity（363 mA·h/g） and a good cycling performance in comparison with Sn and SnO2, it suggests that the association of tin with graphite not only improves the reversible capacities, but also prevents the volume changes resulted from lithium insertion and extraction with tin during a charge-discharge process.
Community plays an important role in the preservation of agricultural heritage system （AHS）. Recently, many AHS have been valorized as interesting resources for rural tourism. The expectations are that tourism devel...
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Community plays an important role in the preservation of agricultural heritage system （AHS）. Recently, many AHS have been valorized as interesting resources for rural tourism. The expectations are that tourism development （TD） can be supportive for the conservation of AHS while creating benefits for local communities. In this study, two mountainous pilot villages （Longxian and Xiaohuang） in a global conservation project for traditional agricutural systems - Globally Important Agricultural Heritage Systems （GIAHS） were selected to identify the relationship between AHS conservation and TD. The study undertook in-depth interviews, and questionnaires of village residents and informal discussions with local villagers. A t-test and a linear regression model were implemented to explore the comparative dimensions of the two communities with different geographical location, economic situation, and stage of TD. The research found some similarities and differences in the two mountainous communities during AHS conservation and TD. Firstly, AHS are preservaed well in both villages unconsiously, while the residents in Xiaohuang value more highly the heritage elements than the respondents in Longxian, and the villagers in Xiaohuang are more worried about their heritage system; Secondly, both villages expect lots of benefits from TD and they clearly perceive more positive than negative impact from tourism and thus approve TD, while the hugedifferent perception on transportation and accessibility in the two villages reflects the bottleneck of TD in Xiaohuang village. At the same time, the respondents from Xiaohuang perceive more positive and fewer negative impact from tourism than the respondents from Longxian. Thirdly, the respondents in the two villages all show positive attitudes towards participation in tourism mostly motivated by the high income expectation. The main factors to determine the community perception in two villages were also analyzed based on the data process. A lo
Stannous oxalate was prepared efficiently and characterized by XRD and FT-IR. It exhibited higher catalytic activity and had profitable effect than tetrabutyl titanate and stannous octoate for the synthesis of polytri...
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Stannous oxalate was prepared efficiently and characterized by XRD and FT-IR. It exhibited higher catalytic activity and had profitable effect than tetrabutyl titanate and stannous octoate for the synthesis of polytrimethylene terephthalate （PTT） via esterification-route. Over this catalyst, the degree of esterification of pure terephthalic acid was up to 94.4% at 260 ℃ after 1.5 h,while the intrinsic viscosity and content of terminal carboxyl groups of the corresponding PTT polyester, polymerized at 260 ℃,60 Pa for 2 h, was 0.8950 dL/g and 15 mol/t, respectively. Stannous oxalate was a promising catalyst for the synthesis of PTT polyester.
With the aid of an atomic force microscope(AFM),we study the interaction between linear DNA fragment and *** different cisplatin concentrations,the AFM used to observe the conformation of DNA has a gradual *** contour...
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With the aid of an atomic force microscope(AFM),we study the interaction between linear DNA fragment and *** different cisplatin concentrations,the AFM used to observe the conformation of DNA has a gradual *** contour length,the end-to-end distance and the local bend angles of the linear DNA fragment can be accurately *** persistence length of DNA interacting with cisplatin is decreased with the increasing cisplatin ***,it is demonstrated that the local bend angles of DNA chains are increased by the binding interaction of cisplatin.
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