可多次塑型、易修复及耐低温的三维动态高分子结构

三维动态高分子结构可在外界刺激下发生可逆的形状改变,但仅采用通常的平面高分子材料,其形成的三维动态结构形成后难以更改,损坏后不易修复,低温下无法使用.最近,将碳纳米管与液晶型类玻璃高分子结合,制备了新型的纳米复合材料薄膜,通过光照对平面材料进行加工,不仅可实现三维动态结构的灵活设计和简易制备,而且结构可多次改变和修复,在低至零下130℃的条件下仍可以使用.     

Exact solution of multidimensional hyper‐radial Schrödinger equation for many‐electron quantum systems

In quantum theory, solving Schrödinger equation analytically for larger atomic and molecular systems with cluster of electrons and nuclei persists to be a tortuous challenge. Here, we consider, Schrödinger equation in arbitrary N‐dimensional space corresponding to inverse‐power law potential function originating from a multitude of interactions participating in a many‐electron quantum system for exact solution within the framework of Frobenius method via the formulation of an ansatz to the hyper‐radial wave function. Analytical expressions for energy spectra, and hyper‐radial wave functions in terms of known coefficients of inverse‐power potential function, and wave function parameters have been obtained. A generalized two‐term recurrence relation for power series expansion coefficients has been established. © 2016 Wiley Periodicals, Inc.     

One-loop formulas for H → Zνlνl for l = e, μ, τ in 't Hooft-Veltman gauge

In this paper, we present analytical results for one-loop contributions to the decay processes \begin{document}$ H\rightarrow Z \nu_l\bar{\nu}_l $\end{document} (for \begin{document}$ l = e, \mu, \tau $\end{document}). The calculations are performed within the Standard Model framework in the 't Hooft-Veltman gauge. One-loop form factors are then written in terms of scalar one-loop functions in the standard notations of \begin{document}$ {\tt LoopTools}$\end{document}. As a result, one-loop decay rates for the decay channels can be evaluated numerically by using the package. Furthermore, we analyze the signals of \begin{document}$ H\rightarrow Z \nu_l\bar{\nu}_l $\end{document} via the production processes \begin{document}$ e^-e^+ \rightarrow ZH^* \rightarrow Z (H^* \rightarrow Z \nu_l\bar{\nu}_l) $\end{document}, including the initial beam polarizations at future lepton colliders. The Standard Model backgrounds, such as the processes \begin{document}$ e^-e^+ \rightarrow \nu_l\bar{\nu}_l ZZ $\end{document}, are also examined in this study. Numerical results indicate that one-loop corrections make contributions of approximately 10% to the decay rates. These are sizeable contributions and should be taken into account at future colliders. We show that the signals \begin{document}$ H\rightarrow Z\nu_l\bar{\nu}_l $\end{document} are clearly visible at the center-of-mass energy \begin{document}$ \sqrt{s}=250 $\end{document} GeV and are difficult to probe in higher-energy regions owing to the dominant backgrounds.     

Studies of anticancer drug cytotoxicity based on long‐term HepG2 spheroid culture in a microfluidic system

Cell‐on‐a‐chip systems have become promising devices to study the effectiveness of new anticancer drugs recently. Several microdevices for liver cancer culture and evaluation of the drug cytotoxicity have been reported. However, there are still no proven reports about high‐throughput and simple methods for the evaluation of drug cytotoxicity on liver cancer cells. The paper presents the results of the effects of the anticancer drug (5‐fluorouracil, 5‐FU) on the HepG2 spheroids as a model of liver cancer. The experiments were based on the long‐term 3D spheroid culture in the microfluidic system and monitoring of the effect of 5‐FU at two selected concentrations (0.5 mM and 1.0 mM). Our investigations have shown that the initial size of the spheroids has influence on the drug effect. With the increase of the spheroids diameter, the drug resistance (for the two tested 5‐FU concentrations) decreases. This phenomenon was observed both through cells metabolism analysis, as well as changes in spheroids sizes. In our research, we have shown that the lower 5‐FU (0.5 mM) concentration causes higher decrease in HepG2 spheroids viability. Moreover, due to the microsystem construction, we observe the drug resistance effect (10th day of culture) regardless of the initial size of the created spheroids and the drug concentration.     

叶片型线对离心油泵性能的影响

以65Y60型离心油泵为研究对象，研究了液体不同粘度下叶片型线对泵性能的影响。首先，利用本课题组独立开发的准三元叶片设计程序以反问题方式设计了两种型线。这两种型线叶片前半部分与原一元叶轮叶片的型线不同、后半部分与一元叶轮相同。然后在不同粘度下将三个叶轮进行性能对比实验。研究表明，叶片进口附近的型线的改变对泵性能有较大影响；适当增大叶轮后盖板流面上的叶片流体动力负荷有助于提高离心油泵输送粘油时的水力性能。     

Existence,uniqueness, and blow‐up rate of large solutions to equations involving the Laplacian on the half line

This paper shows the existence and the uniqueness of the nonnegative viscosity solution of the singular boundary value problem for t >0, , where f is a continuous non‐decreasing function such that f (0)?0, and h is a nonnegative function satisfying the Keller–Osserman condition. Moreover, when h (u )=u ^p with p >3, we obtain the global estimates for the classic solution u (t ) and the exact blow‐up rate of it at t =0. Copyright © 2017 John Wiley & Sons, Ltd.     

Measurement of the beam asymmetry in η photoproduction off the proton

The beam asymmetry, Σ , was measured at ELSA in the reaction p → ηp using linearly polarised tagged photon beams, produced by coherent bremsstrahlung off a diamond. The crystal was oriented to provide polarised photons in the energy range E _γ = 800 to 1400MeV with the maximum polarisation of P _γ = 49 % obtained at 1305MeV. Both dominant decay modes of the η into two photons and 3π⁰ were used to extract the beam asymmetry from the azimuthal modulation of the cross-section. The measurements cover the angular range Θ_cm ≃ 50 -150 degrees. Large asymmetries up to 80% are observed, in agreement with a previous measurement. The eta-MAID model and the Bonn-Gatchina partial wave analysis describe the measurements, but the required partial waves differ significantly.     

Uniformizable families of -motives

Abelian -modules and the dual notion of -motives were introduced by Anderson as a generalization of Drinfeld modules. For such Anderson defined and studied the important concept of uniformizability. It is an interesting question and the main objective of the present article to see how uniformizability behaves in families. Since uniformizability is an analytic notion, we have to work with families over a rigid analytic base. We provide many basic results, and in fact a large part of this article concentrates on laying foundations for studying the above question. Building on these, we obtain a generalization of a uniformizability criterion of Anderson and, among other things, we establish that the locus of uniformizability is Berkovich open.

     

Generalized vibrational perturbation theory for rotovibrational energies of linear,symmetric and asymmetric tops: Theory,approximations, and automated approaches to deal with medium‐to‐large molecular systems

Models going beyond the rigid‐rotor and the harmonic oscillator levels are mandatory for providing accurate theoretical predictions for several spectroscopic properties. Different strategies have been devised for this purpose. Among them, the treatment by perturbation theory of the molecular Hamiltonian after its expansion in power series of products of vibrational and rotational operators, also referred to as vibrational perturbation theory (VPT), is particularly appealing for its computational efficiency to treat medium‐to‐large systems. Moreover, generalized (GVPT) strategies combining the use of perturbative and variational formalisms can be adopted to further improve the accuracy of the results, with the first approach used for weakly coupled terms, and the second one to handle tightly coupled ones. In this context, the GVPT formulation for asymmetric, symmetric, and linear tops is revisited and fully generalized to both minima and first‐order saddle points of the molecular potential energy surface. The computational strategies and approximations that can be adopted in dealing with GVPT computations are pointed out, with a particular attention devoted to the treatment of symmetry and degeneracies. A number of tests and applications are discussed, to show the possibilities of the developments, as regards both the variety of treatable systems and eligible methods. © 2015 The Authors International Journal of Quantum Chemistry Published by Wiley Periodicals, Inc.