[en] The dynamical Lie algebraic approach developed by Y. Alhassid and R.D. Levine combined with the intermediate picture is applied to the study of translational-vibrational energy transfer in the collinear collision between an atom and an anharmonic oscillator. By solving equations of motion for the group parameters under the first-order approximation of the group parameters, the authors calculate the vibrational transition probabilities of anharmonic molecule scattering with an atom in the intermediate picture. Numerical test calculations are carried out for the collinear scattering system HBr + He; the results show that the dynamical Lie algebraic approach can be useful for the description of atom-molecule collision phenomena

[en] Structural, magnetic, and calorimetric properties are reported for the La_1-xPr_xBa₂Cu₃O₇ solid solution. The structure remains orthorhombic with lattice parameter increases from a=0.3872, b=0.3927, and c=1.1709nm for PrBa₂Cu₃O₇ to a=0.3903, b=0.3944, and c=1.1801nm for LaBa₂Cu₃O₇. Substitution of Pr for La depresses T_c from 90 to 52 K for La_0.5Pr_0.5Ba₂Cu₃O₇, which was reported to be a nonsuperconductor. The Pr antiferromagnetic ordering temperature T_N decreases monotonically from 18 K for PrBa₂Cu₃O₇ to 6 K for La_0.8Pr_0.2Ba₂Cu₃O₇. Thus there is a large range of coexistence of superconductivity and antiferromagnetism for 0.2≤x≤0.5. The superconductivity and anomalous Pr ordering will be discussed with the R_1-xPr_xBa₂Cu₃O₇ systems (R=Y, Nd - Lu). [copyright] 2001 American Institute of Physics

[en] An analysis is made of experimental data of NbN thin films prepared by reactive sputtering. Results show that the magnetic field variation of the pinning force density F_p could be fitted to the Kramer relation, F_papprox.b¹2/(1-b)₂, where b is the normalized induction. A study has been made of the flux pinning mechanisms in films. We have also compared the J_c(H) of NbN with those of other high field superconductors, foreseeing the possibility of technical applications of B1 compounds

[en] The interactions between magnetron-sputtered Cu and PECVD amorphous SiCOF film have been studied via Auger electron spectroscopy (AES), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), etc. At the initial sputtering deposition of copper, Cu(II) is formed, then Cu(I) appears, and Cu(0) grows finally. This is likely attributed to high energetic copper atoms or clusters penetrating into the SiCOF film and cleaving Si-O bonds. Additionally, the annealing at 400 deg. C in high pure N₂ leads to the formation of Cu₂O phase at the full expense of Cu phase, subsequently, CuO phase comes into being together with a decrease in Cu₂O phase after annealing at 500 deg. C. Possible reason is that annealing at different temperatures causes a special ratio of Cu/O in some special diffusion area, which determines the formation of reactive production between Cu and SiCOF. Furthermore, C-Cu bond is not formed during sputtering deposition of copper, and even after the annealing

[en] The time-independent energy sudden (ES) representation is defined through application of the energy shift operator S = exp[-(h-ß_n)partial/partialepsilon], where h is the internal (molecular) Hamiltonian. Our introduction of S follows from an earlier study by Chang, Eno, and Rabitz where exp[-iht], which ''factors out'' internal motion, was used to define the time-dependent ES representation. Exact integral equations for the scattering wave function within the ES representation are derived, the leading terms being the approximate ES wave function. Corrections to the ES wave function are nonsingular and involve the generalized potential increment V = S^-₁VS-V, where V is the interaction potential. Boundary conditions and transition amplitudes are discussed, as is the connection between wave functions in the ES and the original representations

[en] Infrared multiphoton vibrational excitation of the linear triatomic molecule has been studied using the quadratic anharmonic Lie-algebra model, unitary transformations, and Magnus approximation. An explicit Lie-algebra expression for the vibrational transition probability is obtained by using a Lie-algebra approach. This explicit Lie-algebra expressions for time-evolution operator and vibrational transition probabilities make the computation clearer and easier. The infrared multiphoton vibrational excitation of the DCN linear tri-atomic molecule is discussed as an example

[en] The transport properties of NSTX plasmas obtained during the 2008 experimental campaign have been studied and are reported here. Transport trends and dependences have been isolated, and it is found that both electron and ion energy transport coefficients have strong dependences on local values of n(del)T, which in turn is strongly dependent on local current density profile. Without identifying this dependence, it is difficult to identify others, such as the dependence of transport coefficients on B_p (or q), I_p and P_heat. In addition, a comparison between discharges with and without Lithium wall conditioning has been made. While the trends in the two sets of data are similar, the thermal transport loss, especially in the electron channel, is found to strongly depend on the amount of Lithium deposited, decreasing by up to 50% of its no-Lithium value.

[en] To investigate the effect of remifentanil combined anesthesia on serum cytokines and oxidative stress indices in patients undergoing laparoscopic surgery for colon cancer. Study Design: Experimental study. Place and Duration of Study: Department of Anesthesiology, Yuhuangding Hospital Affiliated to Qingdao University, Yantai, China, from May 2016 to March 2018. Methodology: A total of 154 patients undergoing laparoscopic surgery for colon cancer were randomly divided into control group and observation group, with 77 cases in each group. Control group received fentanyl combined anesthesia, and observation group received remifentanil combined anesthesia. Levels of serum cytokines IL-8, IL-6, CRP, TNF-αand the levels of oxidative stress indices SOD, MDA, CAT, and GSH on the first day after operation were compared. Occurrence of adverse reactions during anesthesia recovery was observed and recorded in both groups. Results: On the first day after surgery, levels of serum cytokines IL-8, IL-6, CRP, TNF-α and MDA in the observation group were lower than those in the control group (all p<0.001); levels of serum SOD, GSH, and CAT in the observation group were higher than those in the control group (all p<0.001). The frequency of adverse reactions such as nausea and vomiting, chills, restlessness, cough, and tachycardia in the observation group was lower than that in the control group (p=0.029, 0.016, 0.009, 0.025, and 0.003, respectively). Conclusion: Compared with fentanyl combined anesthesia, the remifentanil combined anesthesia can significantly reduce serum levels of cytokines IL-8, IL-6, CRP, TNF-α and oxidative stress level, and is, therefore, more secure for patients undergoing laparoscopic surgery for colon cancer. (author)

[en] This paper is concerned with the complete periodic antisynchronization issue of memristor-based neural networks with mixed time-varying delays. Under the framework of Filippov solutions of the differential equations with discontinuous right-hand side, based on Mawhin-like coincidence theorem in set-valued analysis theory, the proof of the existence of periodic solution is presented. By applying the Lyapunov-Krasovskii functional approach, adaptive controller is designed and unknown control parameters of the slave system are determined by adaptive laws, and the complete periodic adaptive antisynchronization condition is addressed to ensure the slave system global antisynchronization with the master system. An illustrative example is given to demonstrate the effectiveness of the obtained results. (author)

No abstract available