Writer as Activist, Activist as Writer

This brief essay describes the quandry and found guidelines of balancing art and activism, specifically as a writer. Examples come from the author\u27s own work

Three axis controller Patent

Unitary three-axis controller for flight vehicles within or outside atmospher

Low pressure chemical vapour deposition at quasi-high flow

A new chemical vapour deposition (CVD) technique is presented. It is especially advantageous for the deposition of compound materials. The technique improves the uniformity and reproducibility of the deposition. The economical use of gaseous reactants is improved by a factor varying between 5 and 20. This is important in the case of expensive metal-organic CVD methods. The method consists in the manifold repetition of the following sequence: evacuation, filling and deposition in a horizontal tube reactor. The filling time of 50 ms is short compared with the deposition period 1 s.\ud \ud The advantages of the method are demostrated with results for the deposition of undoped, phosphorus-doped and boron-doped silicon and SiO2.\u

Low Phosphorus Concentrations in Si by Diffusion from Doped Oxide Layers

The diffusion of phosphorus into silicon from doped oxide layers, deposited at low temperatures, has been studied in order to achieve reproducible impurity distributions with surface concentrations varying from 5 × 1015 to 1018 atoms/cm3. Special attention has been given to the differences arising from indiffusion in an N2 or in an O2 ambient. The dependence on the temperature of the diffusion coefficients of phosphorus in silicon and in silicon dioxide is determined at a surface concentration of 5 × 1016 atoms/cm3

Initial results from flight testing a large, remotely piloted airplane model

The first four flights of a remotely piloted airplane model showed that a flight envelope can be expanded rapidly and that hazardous flight tests can be conducted safely with good results. The flights also showed that aerodynamic data can be obtained quickly and effectively over a wide range of flight conditions, clear and useful impressions of handling and controllability of configurations can be obtained, and present computer and electronic technology provide the capability to close flight control loops on the ground, thus providing a new method of design and flight test for advanced aircraft

In Situ Growth Rate Measurement of Selective LPCVD of Tungsten

The reflectance measurement during the selective deposition of W on Si covered with an insulator grating is proven tobe a convenient method to monitor the W deposition. The reflectance change during deposition allows the in situ measurementof the deposition rate. The influence of surface roughening due to either the W growth or an etching pretreatmentof the wafer is modeled, as well as the effect of selectivity loss and lateral overgrowth

A versatile micro-scale silicon sensor/actuator with low power consumption

We designed a CMOS compatible hot-surface silicon device operating at a power down to sub-µW. It has a pillarshaped structure with a nano-size (10-100 nm) conductive link between the electrodes separated by a SiO2 layer. The device is capable of maintaining a µm-size hot-surface area of several hundred degrees centigrade due to non-radiative recombination of carriers in a thin (13 nm) poly silicon surface layer. Such a device can be used as a light source, a heat source, as well as a sensitive detector of light and heat. As a direct application, we demonstrate the feasibility to perform as an adsorption-desorption sensor, and as a unit for activating chemisorption/decomposition (i.e. micro-reactor)