Xuzhou Institute of Technology

About: Xuzhou Institute of Technology is a education organization based out in Xuzhou, China. It is known for research contribution in the topics: Catalysis & Computer science. The organization has 1696 authors who have published 1521 publications receiving 13541 citations.

Energy Levels, Wavelengths, Probabilities, and Oscillator Strengths of Transition for Ge-Like Pd, Ag, and Cd Ions

Abstract: High-accuracy calculations of energy levels, wavelengths, probabilities, and oscillator strengths of transition of resonance lines for Ge-like Pd, Ag, and Cd ions have been performed. For the accurate treatment of relativity, the contributions of Breit interactions and quantum electrodynamics correction were considered. The calculated values of energy levels and wavelengths, including core–valence corrections, are found to be in excellent agreement with other theoretical and experimental values for Ge-like Pd, Ag, and Cd ions. The number of energy levels and wavelengths we considered is larger than that of any other theoretical calculations. The transition probabilities are also given where no other theoretical results and experimental values are available.

Bilinear approaches for a finite-dimensional Hamiltonian system

Abstract: The paper investigates a finite-dimensional Hamiltonian system through bilinear approaches, i.e. the Hirota method and Wronskian technique. This system is obtained by constraining the potential of the sine-Gordon equation with a symmetry. We show that the potential can be a summation of squares of wave functions and these wave functions can be precisely described as Wronskians. Furthermore, our work also demonstrates that the bilinear approaches are efficient tools not only for partial differential equations but also for ordinary differential equations.

Extreme extensibility and size effects of high-carbon martensitic steel subjected to micro-rolling

Abstract: It is difficult for high-carbon quenched steel to deform plastically at room temperature;this has been attributed to the composition (high carbon content) and microstructure (martensite without plasticity), but the geometric scale of the sample has not previously been considered. In the present study, a quenched 9SiCr steel with an initial thickness of 400 mm was micro-rolled at room temperature in order to understand the size effects. It was found that the extensibility of the test steel was over 200%, and the hardness was 39% higher than that of the as-quenched steel. Additional research was performed to explore these novel findings. We found that the transverse compressive stress was increased by negative-roll-gap rolling, while the longitudinal and vertical compressive stresses were also increased because of the increase in contact surface area per unit volume;consequently, the hydrostatic stress also increased. These above factors are helpful to prevent edge-cracking and the formation of split ends in rolled products, and they also inhibit the generation and expansion of internal defects;hence the plasticity is improved. We refer to the above effects, which can be explained by conventional theories, as first-order size effects. However, once dislocations and voids arrive on the surfaces of the sample, they can be released and disappear, causing the plasticity to improve even more than usual when the specific surface area becomes very large. A ultrathin rolled product with a large specific surface area cannot be regarded as an ideal homogeneous, continuous, isotropic material. The surface effects of the thin-rolled product are referred to as second-order size effects. These results indicate that the traditional assumption that high-carbon martensite must have extremely low plasticity is no longer valid in the case of ultrathin rolled products, whose mechanical characteristics and physical essence can be understood only by considering two distinct orders of size effects.

Testing device and testing method for load-sensitive multitandem valve

Abstract: The invention discloses a testing device and testing method for a load-sensitive multitandem valve. The testing device comprises a first pressure sensor, a second pressure sensor and a ninth pressuresensor connected with a T port, a P port and an LS port of the load-sensitive multitandem valve. An oil outlet of an electric variable pump is connected with the P port of the load-sensitive multitandem valve through an oil supply pipeline. The oil supply pipeline is connected with a first proportional overflow valve and a first flow sensor. A control oil port of each reversing link is connected with a control oil source through two proportional pressure reducing valves. Two work oil ports of each reversing link are connected with an oil tank through two proportional overflow valves and provided with a flow sensor and a pressure sensor. The testing method includes the steps that the testing device is used for conducting a pressure loss test; the testing device is used for conducting a jiggle characteristic test; and the testing device is used for conducting a flow saturation resistance test. The testing device can meet the testing requirements for the pressure loss, jiggle characteristic and flow saturation resistance at the same time, and is high in testing accuracy. Through the testing method, the characteristic data can be accurately obtained.