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[en] Variation of cleanliness and distribution of inclusions in thickness and width direction of highcarbon chromium bearing steel billets has been studied using total oxygen and nitrogen analysis and SEM/EDS, and the growth behavior of inclusions during solidification was studied with the help of solidification model. The region wit h relatively high total oxygen contents in the cross profile of billets is between inner arc side 3/16 and outer arc side 1/4; between left edge side 5/16 and right edge side 5/16. The formation sequence of inclusions is MgO-Al2O3 > TiN > MnS. MnS could wrap MgO-Al2O3 and reduces the damage to steel matrix caused by the latter, but generally could not effectively wrap TiN. Besides, TiN could wrap MgO-Al2O3 before MnS, which would weaken the protective capacity of MnS. Moreover, compared with MgO-Al2O3 inclusions, the sizes of TiN inclusions are generally larger. Thus the control of TiN inclusions should be strengthened. In hickness direction, the maximum size regions of TiN and MnS inclusions are inner arc side 1/3 and outer arc side 1/3; in width direction, the regions are edge side 1/3. During bearing processing, these regions and the regions with high total oxygen content should be avoided.
[es]La distribución de inclusiones en las secciones transversales y longitudinales de barras de acero para rodamientos al cromo con alto contenido de carbono se ha estudiado determinando el contenido total de nitrógeno y oxígeno y mediante SEM/EDS. El crecimiento de inclusiones durante la solidificación se estudió con la ayuda del modelo de solidificación. La zona con contenido total de oxígeno relativamente alto en la sección transversal de las barras, es entre el arco interior de 3/16 y el exterior 1/4; entre el borde izquierdo 5/16 y el derecho 5/16. La secuencia de formación de las inclusiones es MgO-Al2O3 > TiN > MnS. El MnS podría envolver a los óxidos de magnesio y aluminio (MgO-Al2O3) y reducir el daño causado al acero, pero generalmente no podría envolver al TiN. Aparte, el TiN podría envolver a los óxidos de magnesio y aluminio (MgO-Al2O3) antes que al MnS, debilitando de este modo la capacidad protectora del MnS. Además, en comparación con las inclusiones de MgO-Al2O3, las inclusiones de TiN son generalmente más grandes, por lo que es necesario controlar la formación de estas inclusiones. En la sección longitudinal, el tamaño máximo de las inclusiones de TiN y MnS son arco interno 1/3 y exterior 1/3; en la dirección del ancho, las regiones son borde 1/3. Estas regiones y las aquellas con altos contenido de oxígeno deben evitarse en el procesado de rodamientos.
[en] The phase structure of the U(1)L x U(1)R symmetric lattice Yukawa-model with a mirror pair of fermion fields is explored by numerical Monte Carlo simulation. Its implications on the continuum physics are discussed. (orig.)
[en] We study the improvement of Kennedy-Kuti's linear accept/reject algorithm with different ordering criterion and modified Bhanot-Kennedy estimator of eΔH to reduce probability-bound violation. A new stochastic Monte Carlo algorithm to accommodate the probability-bound violation is proposed
[en] Strategies for treating thoracic and liver tumors using pencil beam scanning proton therapy Thoracic and liver tumors have not been treated with pencil beam scanning (PBS) proton therapy until recently. This is because of concerns about the significant interplay effects between proton spot scanning and patient’s respiratory motion. However, not all tumors have unacceptable magnitude of motion for PBS proton therapy. Therefore it is important to analyze the motion and understand the significance of the interplay effect for each patient. The factors that affect interplay effect and its washout include magnitude of motion, spot size, spot scanning sequence and speed. Selection of beam angle, scanning direction, repainting and fractionation can all reduce the interplay effect. An overview of respiratory motion management in PBS proton therapy including assessment of tumor motion and WET evaluation will be first presented. As thoracic tumors have very different motion patterns from liver tumors, examples would be provided for both anatomic sites. As thoracic tumors are typically located within highly heterogeneous environments, dose calculation accuracy is a concern for both treatment target and surrounding organs such as spinal cord or esophagus. Strategies for mitigating the interplay effect in PBS will be presented and the pros and cons of various motion mitigation strategies will be discussed. Learning Objectives: Motion analysis for individual patients with respect to interplay effect Interplay effect and mitigation strategies for treating thoracic/liver tumors with PBS Treatment planning margins for PBS The impact of proton dose calculation engines over heterogeneous treatment target and surrounding organs I have a current research funding from Varian Medical System under the master agreement between University of Pennsylvania and Varian; L. Lin, I have a current funding from Varian Medical System under the master agreement between University of Pennsylvania and Varian.; H. Li, Na
[en] The valence band electronic structures of the III-V phosphides BP, GaP, and InP were investigated using soft x-ray fluorescence spectroscopy and compared with band structure calculations using full-potential linearized augmented plane wave method based on density functional theory. The P L2,3 spectra of these phosphorus compounds are reported and compared with the calculated (s+d)-local partial densities of states (LPDOS's). For BP, the B K spectrum is also reported. Generally good agreement is obtained between the spectra and calculated LPDOS's. Two other interesting results were found. The normally suppressed P L1 spectrum was observed in resonance with the B K spectrum of BP. Also, strong resonant inelastic x-ray scattering was observed at the Ga M2,3 edge associated with energy loss to local electronic excitations from the Ga d states, permitting the Ga d states to be accurately located with respect to other band features
[en] Institute of Nuclear Energy Research in Taiwan initiated the program aimed at the study of plasma melting process for improving the technology of low-level radioactive waste treatment
[ru]Институт исследований по ядерной энергии на Тайване (INER) начал программу изучения процесса плазменного плавления с целью улучшить технологии обработки радиоактивных отходов низкой удельной активности
[en] Some simple properties in the solution of the random phase approximation are discussed. By solving the problem in the Tamm-Dancoff approximation, we can obtain immediately a solution with good accuracy for the random phase approximation together with the RPA ground state wave function. The physical picture of the correlated ground state is suggested. (orig.)
[en] In this paper the theoretical breakdown of the minimal standard model in four dimension is investigated when the mass of the Higgs particle is larger than the weak interaction scale. The triviality arguement for an upper bound on the Higgs mass is made quantitative on the lattice in large scale simulations of the spontaneously broken Higgs sector. The authors obtain an upper bound mH ≅640 GeV on the Higgs mass at a dimensionless correlation length ξ = 2 in lattice units.units