Studies on Rheological Behaviors of Bismaleimide Resin System for Resin Transfer Molding

AbstractThe rheological behavior of bismaleimide resin for resin transfer molding(RTM) was studied with DSC analysis and viscosity experiments. A rheological model based on the dual-Arrhenius equation was established and used to simulate the rheological behavior of the resin. The model predictions determined from the dual-Arrhenius equation were in good agreement with experimental data. The processing window of the resin system can be well determined based on the developed model. The rheological model is important for processing simulation and quality control of RTM processing for high performance composites

Determination of the superconducting gap in near optimally doped Bi_2Sr_{2-x}La_xCuO_{6+\delta} (x ~ 0.4) from low-temperature specific heat

Low-temperature specific heat of the monolayer high-Tc superconductor Bi_2Sr_{2-x}La_xCuO_{6+\delta} has been measured close to the optimal doping point (x ~ 0.4) in different magnetic fields. The identification of both a T^2 term in zero field and a \sqrt{H} dependence of the specific heat in fields is shown to follow the theoretical prediction for d-wave pairing, which enables us to extract the slope of the superconducting gap in the vicinity of the nodes (v_{\Delta}, which is proportional to the superconducting gap \Delta_0 at the antinodes according to the standard d_{x^2-y^2} gap function). The v_{\Delta} or \Delta_0 (~ 12 meV) determined from this bulk measurement shows close agreement with that obtained from spectroscopy or tunneling measurements, which confirms the simple d-wave form of the superconducting gap.Comment: 5 pages, 4 figures, 1 tabl

Methyl 3-methyl-5-oxo-4-(phenyl­hydrazono)-4,5-dihydro-1H-pyrazole-1-carbodithio­ate

The title compound, C12H11N4OS2, has been synthesized by the condensation reaction of 3-oxo-2-(phenyl­hydrazono)butanate and S-methyl­dithio­carbazate. The hydrazine unit and the pyrazole ring are coplanar [dihedral angle 3.8 (4)°] due to extensive conjugation and the N—H⋯O=C intra­molecular hydrogen bond. Two adjacent mol­ecules form dimers due to short C—H⋯O=C [R 2 2 (18)] and C—H⋯S=C [R 2 2 (22)] inter­molecular inter­actions. C—H⋯S—C [R 2 2 (14)] inter­actions link these dimers into ribbons in the [011] direction

Pair production of neutral Higgs bosons from the left-right twin Higgs model at the ILC and LHC

In the framework of the left-right twin Higgs model, we study pair production of the neutral Higgs bosons at the International Linear Collider ($ILC$) and the $CERN$ $LHC$. We find that the production cross section of the process $e^{+}e^{-}\to \phi^{0}h$ are at the level of several tens $fb$ at the $ILC$, the production cross section of the $\phi^{0}\phi^{0}$ pair and $\phi^{0}h$ pair are at the level of several hundreds $fb$ at the $LHC$. As long as the neutral Higgs boson $\phi^{0}$ is not too heavy, we conclude that its pair production might be used to test for the left-right twin Higgs model at the $LHC$ experiment or in the future $ILC$ experiment.Comment: Typo corrections, references adde

(3-{[N-(5-Chloro-2-hy­droxy­phen­yl)oxamo­yl]amino}­prop­yl)dimethyl­aza­nium perchlorate

In the title compound, C13H19ClN3O3 +·ClO4 −, the 3-(di­meth­yl­ammonio)­propyl group of the cation is disordered over two sets of sites with occupancies 0.772 (6) and 0.228 (6). The cations are joined by pairs of N—H⋯O hydrogen bonds into centrosymmetric dimers and these dimers are assembled into chains along the a-axis direction, also through N—H⋯O hydrogen bonds. The perchlorate anions are linked to the hy­droxy groups of the cations by O—H⋯O hydrogen bonds. The positively charged ammonium groups and the anions give rise to folded layers parallel to the ab plane

Confining charged particles with time-varying magnetic fields: toward non-torus configuration of fusion plasmas

We develop protocols to confine charged particles using time-varying magnetic fields and demonstrate the possible non-torus configuration resulting from the distribution of single-particle motion orbits. A two-step strategy is proposed to achieve this goal: preliminary protocols are contrived by solely considering the magnetic force; afterwards they are evaluated and selected through numerical solutions to the equation of motion, taking into account inductive electric fields. It is shown that a fine-tuned tangent-pulse protocol can maintain its centralized configuration even in the presence of associated electric fields, which illuminates an alternative approach to designing the confinement scenario for fusion plasmas.Comment: 5 pages, 3 figure