水泥厂用耐热钢选材与结构

水泥厂用耐热钢配件使用寿命的长短直接影响水泥的产量,而制约配件组织性能的各合金元素含量,又直接影响水泥生产的成本。     

关于"顶水工作的太阳热水器"的设想

本文附图所示是顶水工作的太阳热水器的原理图。太阳光能被位于真空玻璃管（1）内的导热能力强的紫铜棒（2）吸收，并传给水箱（5）底部的紫铜板（3），水箱内的水主要用对流换热的方式吸取紫铜板的热量而加热升温。如果水温达不到所设定的值，可由电热元件（4）以接力的方式继续加热，直至达到设定的水温为止。热水由水箱和外壳（10）之间所填充的绝热材料保温。沐浴时，打开进水阀门，冷水从管（8）进入水箱，慢慢顶推热水经曲折通道从管（9）流出（近似于单向活塞流）至喷头淋下，直至冷水到达管（9）为止。此间，沐浴者享受着太阳的恩惠。曲折通道由水箱箱底紫铜板、箱顶、左右箱壁以及垂直安装的隔板组成，但曲折通道的尺寸要合理，既利于水的对流换热，又要让冷水能顶推着热水走而尽量减少冷热水的混合。当然隔板三边与水箱壁之间要密合，防止水在流动过程中短路。显然还有着单向活塞流功能的其它结构和方案。     

Audio-visual interaction in multimodal communication

Multimedia signal processing is more than simply “putting together” text, audio, images, and video. It is the integration and interaction among these different media that creates new systems and new research challenges and opportunities. In multimodal communication where speech is involved, audio-visual interaction is particularly significant     

低工作温度的氧化钨气敏材料

本文报道了一种可以在１００℃左右工作的氢化钨气敏材料，它对氢气和一氧化氮有很高的灵敏度和良好的选择性，并可对空气中的一氧化氮进行探测     

Fabrication and selective surface modification of 3-dimensionally textured biomedical polymers from etched silicon substrates

A new method is described for producing biomedically relevant polymers with precisely defined micron scale surface texture in the x, y, and z planes. Patterned Si templates were fabricated using photolithography to create a relief pattern in photoresist with lateral dimensions as small as 1 micron. Electroless Ni was selectively deposited in the trenches of the patterned substrate. The Ni served as a resilient mask for transferring the patterns onto the Si substrate to depths of up to 8.5 microns by anisotropic reactive ion etching with a fluorine-based plasma. The 3-dimensional (3-D) textured silicon substrates were used as robust, reusable molds for pattern transfer onto poly (dimethyl siloxane), low density poly (ethylene), poly (L-lactide), and poly (glycolide) by either casting or injection molding. The fidelity of the pattern transfer from the silicon substrates to the polymers was 90 to 95% in all three planes for all polymers for more than 60 transfers from a single wafer, as determined by scanning electron microscopy and atomic force microscopy. Further, the 3-D textured polymers were selectively modified to coat proteins either in the trenches or on the mesas by capillary modification or selective coating techniques. These selectively patterned 3-D polymer substrates may be useful for a variety of biomaterial applications.     

Tilted superlattice composition profile determined by photoluminescence and thermal disordering

The composition profile of an (AlAs)_1/2(GaAs)_1/2 tilted superlattice is characterized for the first time. The tilted superlattice sample is thermally disordered, and the energy of the direct band gap photoluminescence peak is measured as a function of increasing layer interdiffusion. The shift in the photoluminescence peak energy after completely disordering the tilted superlattice is 39 meV. A theoretical model is used to simulate the change in band gap as a function of layer interdiffusion for several composition profiles. The profile that gives the best fit to the experimental data is chosen. The tilted superlattice composition profile is found to be sinusoidal, varying from Al_0.40Ga_0.60As to Al_0.60Ga_0.40As.