This paper presents a study on the motion response of a tension-leg platform(TLP) under first-and second-order wave forces, including the mean-drift force, difference and sum-frequency forces. The second-order wave fo...This paper presents a study on the motion response of a tension-leg platform(TLP) under first-and second-order wave forces, including the mean-drift force, difference and sum-frequency forces. The second-order wave force is calculated using the full-field quadratic transfer function(QTF). The coupled effect of the horizontal motions, such as surge, sway and yaw motions, and the set-down motion are taken into consideration by the nonlinear restoring matrix. The time-domain analysis with 50-yr random sea state is performed. A comparison of the results of different case studies is made to assess the influence of second-order wave force on the motions of the platform. The analysis shows that the second-order wave force has a major impact on motions of the TLP. The second-order difference-frequency wave force has an obvious influence on the low-frequency motions of surge and sway, and also will induce a large set-down motion which is an important part of heave motion. Besides, the second-order sum-frequency force will induce a set of high-frequency motions of roll and pitch. However, little influence of second-order wave force is found on the yaw motion.展开更多
This report investigated the ordering of the alky chain of sphingomyelin(SMs) monolayers induced by cholesterol at the air/water interface using high-resolution broadband sum frequency generation vibrational spectrosc...This report investigated the ordering of the alky chain of sphingomyelin(SMs) monolayers induced by cholesterol at the air/water interface using high-resolution broadband sum frequency generation vibrational spectroscopy(HR-BB-SFG-VS). The SFG spectra of the three nature sphingomyelin/cholesterol mixture monolayers with two concentrations of the cholesterol at the air/water interface are performed under different polarization combination. A new resolved CH_2 symmetric stretching(d^+, ～2834 cm^(-1))and the CH3 symmetric stretching(r^+,～2874 cm^(-1)) mode are applied to characterize the conformational order in the sphingomyelin/cholesterol mixture monolayers. It was found that the cholesterol make the sphingosine backbones more conformational order. During this process, the conformational order of the N-linked acyl chain remains unaltered. Moreover, the sphingosine backbones of SMs have much larger contributions to gauche defects of SMs than one in the N-linked acyl chain. These results presented here not only shed lights on understanding of the interactions of sphingomyelin molecules with cholesterol molecules at interface but also demonstrates the ability of HR-BB-SFG to probe such complicated molecular systems.展开更多
Let Fp be the finite field of p elements with p prime.If A is a subset of Fp and g is an element of F*p with order ν,then max{|A + g·A|,|A·A|}>> (ν/(ν + |A|2) )1/12|A|13/12.
In this paper,we study the joint limit distributions of point processes of exceedances and partial sums of multivariate Gaussian sequences and show that the point processes and partial sums are asymptotically independ...In this paper,we study the joint limit distributions of point processes of exceedances and partial sums of multivariate Gaussian sequences and show that the point processes and partial sums are asymptotically independent under some mild conditions.As a result,for a sequence of standardized stationary Gaussian vectors,we obtain that the point process of exceedances formed by the sequence(centered at the sample mean) converges in distribution to a Poisson process and it is asymptotically independent of the partial sums.The asymptotic joint limit distributions of order statistics and partial sums are also investigated under different conditions.展开更多
In this paper, I propose an overall model of the semantic and semiotic functions of money and capital forms, based on an ecological view of human activity and a theory of the origin of money(coined precious metals). T...In this paper, I propose an overall model of the semantic and semiotic functions of money and capital forms, based on an ecological view of human activity and a theory of the origin of money(coined precious metals). The meaning of money is replaced in a structured human perspective, and a critical discussion is outlined on the grounds of the material and capital flows and functions identified. The madness of money follows from the separation of economy and ecology. That madness causes serious damage, especially under certain circumstances that the structural analysis can identify. Finally I add some new considerations on the psycho-semiotic implications of the analysis. The societal structure discussed can be interpreted in terms that have strikingly direct correspondence to those describing semiotic aspects of language and the human psyché, where the concepts of meaning and madness are immediately pertinent.展开更多
The authors first derive the normal expansion of the joint density function of two orderstatistics from the uniform distribution and then, using the approximation, establish a wayto estimate the normal convergence rat...The authors first derive the normal expansion of the joint density function of two orderstatistics from the uniform distribution and then, using the approximation, establish a wayto estimate the normal convergence rate for trimmed sums. For applications, the convergencerates for the intermediately trimmed sums and heavily trimmed surns are found out.展开更多
基金supported by the National Natural Science Foundation of China(Nos.51239008 and 51279130)
文摘This paper presents a study on the motion response of a tension-leg platform(TLP) under first-and second-order wave forces, including the mean-drift force, difference and sum-frequency forces. The second-order wave force is calculated using the full-field quadratic transfer function(QTF). The coupled effect of the horizontal motions, such as surge, sway and yaw motions, and the set-down motion are taken into consideration by the nonlinear restoring matrix. The time-domain analysis with 50-yr random sea state is performed. A comparison of the results of different case studies is made to assess the influence of second-order wave force on the motions of the platform. The analysis shows that the second-order wave force has a major impact on motions of the TLP. The second-order difference-frequency wave force has an obvious influence on the low-frequency motions of surge and sway, and also will induce a large set-down motion which is an important part of heave motion. Besides, the second-order sum-frequency force will induce a set of high-frequency motions of roll and pitch. However, little influence of second-order wave force is found on the yaw motion.
基金the National Natural Science Foundation of China(No.21227802)the National Natural Science Foundation of China(Nos. 21503235, 21673251)the ICCAS for Start-up Funding
文摘This report investigated the ordering of the alky chain of sphingomyelin(SMs) monolayers induced by cholesterol at the air/water interface using high-resolution broadband sum frequency generation vibrational spectroscopy(HR-BB-SFG-VS). The SFG spectra of the three nature sphingomyelin/cholesterol mixture monolayers with two concentrations of the cholesterol at the air/water interface are performed under different polarization combination. A new resolved CH_2 symmetric stretching(d^+, ～2834 cm^(-1))and the CH3 symmetric stretching(r^+,～2874 cm^(-1)) mode are applied to characterize the conformational order in the sphingomyelin/cholesterol mixture monolayers. It was found that the cholesterol make the sphingosine backbones more conformational order. During this process, the conformational order of the N-linked acyl chain remains unaltered. Moreover, the sphingosine backbones of SMs have much larger contributions to gauche defects of SMs than one in the N-linked acyl chain. These results presented here not only shed lights on understanding of the interactions of sphingomyelin molecules with cholesterol molecules at interface but also demonstrates the ability of HR-BB-SFG to probe such complicated molecular systems.
基金Supported by National Natural Science Foundation of China(Grant No.11271249)Specialized Research Fund for the Doctoral Program of Higher Education(Grant No.20120073110059)
文摘Let Fp be the finite field of p elements with p prime.If A is a subset of Fp and g is an element of F*p with order ν,then max{|A + g·A|,|A·A|}>> (ν/(ν + |A|2) )1/12|A|13/12.
基金Supported by National Natural Science Foundation of China(Grant No.11171275)the Program for Excellent Talents in Chongqing Higher Education Institutions(Grant No.120060-20600204)supported by the Swiss National Science Foundation Project(Grant No.200021-134785)
文摘In this paper,we study the joint limit distributions of point processes of exceedances and partial sums of multivariate Gaussian sequences and show that the point processes and partial sums are asymptotically independent under some mild conditions.As a result,for a sequence of standardized stationary Gaussian vectors,we obtain that the point process of exceedances formed by the sequence(centered at the sample mean) converges in distribution to a Poisson process and it is asymptotically independent of the partial sums.The asymptotic joint limit distributions of order statistics and partial sums are also investigated under different conditions.
文摘In this paper, I propose an overall model of the semantic and semiotic functions of money and capital forms, based on an ecological view of human activity and a theory of the origin of money(coined precious metals). The meaning of money is replaced in a structured human perspective, and a critical discussion is outlined on the grounds of the material and capital flows and functions identified. The madness of money follows from the separation of economy and ecology. That madness causes serious damage, especially under certain circumstances that the structural analysis can identify. Finally I add some new considerations on the psycho-semiotic implications of the analysis. The societal structure discussed can be interpreted in terms that have strikingly direct correspondence to those describing semiotic aspects of language and the human psyché, where the concepts of meaning and madness are immediately pertinent.
文摘The authors first derive the normal expansion of the joint density function of two orderstatistics from the uniform distribution and then, using the approximation, establish a wayto estimate the normal convergence rate for trimmed sums. For applications, the convergencerates for the intermediately trimmed sums and heavily trimmed surns are found out.
