高性能精梳机的质量

描述了立达E65/E75新型精梳机的特征,包括工艺过程和所加工的精梳条的特点.E65/E75已在工艺和技术上实现了高性能棉精梳的新概念.目前在纺纱厂生产高质量纱线时可以达到450钳次/min.     

On the decomposition of the 0.6LiBH4-0.4Mg(BH4)2 eutectic mixture for hydrogen storage

The dehydrogenation reaction of the 0.6LiBH₄-0.4Mg(BH₄)₂ eutectic system was investigated by Temperature-Programmed-Desorption and Pressure-Composition-Isotherm methods, in the range of 25–540 °C and 0.1–150 bar of p(H₂). A sequence of four decomposition steps was found by TPD measurements; they occur at 235, 315, 365 and 460 °C for p(H₂) = 3 bar, with a clear T decrease with respect to pure LiBH₄ and Mg(BH₄)₂. In the PCI experiments, the first two steps could not be resolved but appeared merged in a single process. The amounts of H₂ release at each step and the Δ_rH and Δ_rS values derived from van’t Hoff plots were analyzed and compared with known results for relevant possible reactions. A scheme of interpretation was then proposed for all four processes. In particular, a fraction of LiBH₄ and Mg(BH₄)₂ would react together in the range of 300–350 °C according to 2LiBH₄ + Mg(BH₄)₂ → 2B + 2LiH + MgB₂ + 7H₂, thus explaining the quite large H₂ yield therein observed. The first and fourth steps correspond to decompositions of pure remaining Mg(BH₄)₂ and LiBH₄, respectively, and the third one to dehydrogenation of MgH₂ produced in the first step.     

Modified synthesis of [Fe/LiF/C] nanocomposite, and its application as conversion cathode material in lithium batteries

In an attempt to enhance the energy storage capacity and discharge voltage, a new cathode material based on ferrocene and LiF for lithium-ion batteries has been explored [Fe/LiF/C] nanocomposite (1) has been synthesized by pyrolysis of a ferrocene/LiF mixture at 700 °C using a rotating quartz tube setup in a furnace. The structure and morphology of the composite were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), Brunauer-Emmer-Teller (BET) analysis, Raman, and Mössbauer spectroscopy. The nanocomposite is composed of well-defined nanotubes which are interlinked by graphitic shell-type structures containing uniformly distribution of Fe, Fe-C, and LiF nanoparticles. The binder-free nanocomposite cathode showed enhanced electrochemical performance with the reversible specific capacity of 230 mAh g⁻¹ (1.3-4.3 V) at 20.8 mA g⁻¹ at room temperature. It exhibited a remarkable cyclic stability and good rate capability performances. The morphology of 1 was changed by ball milling, and the resulting nanocomposite 2 did not show any cyclic stability as a cathode. Thus, the cyclic stability and rate capability performances of 1 were attributed to its structure and morphology.     

On negative differential resistance in hydrodynamic simulation of partially depleted SOI transistors

We show that the negative differential resistance in the I/sub d/-V/sub ds/ characteristics observed in hydrodynamic transport simulations of partially depleted silicon-on-insulator MOSFETs disappears if the nonlocality of tunneling effects are properly accounted for in the recombination-generation process.     

An attempt to model the human body as a communication channel

Using the human body as a transmission medium for electrical signals offers novel data communication in biomedical monitoring systems. In this paper, galvanic coupling is presented as a promising approach for wireless intra-body communication between on-body sensors. The human body is characterized as a transmission medium for electrical current by means of numerical simulations and measurements. Properties of dedicated tissue layers and geometrical body variations are investigated, and different electrodes are compared. The new intra-body communication technology has shown its feasibility in clinical trials. Excellent transmission was achieved between locations on the thorax with a typical signal-to-noise ratio (SNR) of 20 dB while the attenuation increased along the extremities.     

Scaling of strained-Si n-MOSFETs into the ballistic regime and associated anisotropic effects

The dependence of the strain-induced on-current improvement in n-MOSFETs on scaling and the crystallographic orientation of the channel is investigated by self-consistent full-band Monte Carlo simulation. For a channel orientation along the <110> direction, the enhancement decreases weakly from almost 40% to 30% as the effective gate length is reduced from 75 to 25 nm. For the <100> direction, the improvement is about 10% higher. The anisotropy of the drain current, which vanishes for small drain voltages, is attributed to the different band curvatures above 100 meV. This feature appears to be crucial for quasi-ballistic transport of the electrons in the high longitudinal field as they enter the source-side of the channel.