We consider a sensorless approach to feeding parts on a conveyor belt using pins (rigid barriers) to topple parts into desired orientations. Given the n-sided 2D convex projection of an extruded polygonal part, its center of mass (COM), and coefficients of friction, we develop an O(n) algorithm to compute the toppling graph, a new data structure that represents the mechanics of toppling includi...

A compact optical package for mounting a VCSEL or PIN array has been developed. Each package couples an array to a fiber ribbon terminated with a commercial MT ferrule. The package is fabricated with beryllium oxide (BeO), allowing efficient removal of the heat produced by the array. The package is quite compact as it is significantly smaller than an MT ferrule. The design simplifies testing an...

We report on the demonstration of a broadband (60 GHz), spectrally hitless, compact (20 microm x 40 microm), fast (7 ns) electro-optical switch. The device is composed of two coupled resonant cavities, each with an independently addressable PIN diode. This topology enables operation of the switch without perturbing adjacent channels in a wavelength division multiplexing (WDM) system.

In this paper, we proposed a novel structure for designing all optical filter based on photonic crystal structure. In designing the proposed filter, we simply employed a point defect localized between input and output waveguides as wavelength selecting part of the filter. The initial form of this filter is capable of selecting optical waves at =1560 nm, the transmission efficiency of the filte...

In this work we present a high-speed optical receiver with external large-area photodiode. The optical receiver is realized in 0.35μm SiGe BiCMOS technology. The input circuit is a two-transistor transimpedance amplifier using an common-emitter and an emitter-follower configuration. An external silicon PIN photodiode of a squared area of 0.25mm2 with a rise time of 0.4ns at 850nm light is used....

In this paper, we present two algorithms based on the Froidure-Pin Algorithm for computing a finite semigroup. If U is any semigroup, and A be a subset of U , then we denote by 〈A〉 the least subsemigroup of U containing A. If B is any other subset of U , then, roughly speaking, the first algorithm we present describes how to use any information about 〈A〉, that has been found using the Froidure-...

Problems occurring in the use of external fixators for bone fractures include pin-bone interface necrosis, infection, and loosening. These may be initiated and enhanced by pin-bone interface stress levels. Based on stress data from finite element method (FEM) models, an analytical "closed-form" model of the local pin-bone configuration in long-bone fracture fixation is developed. This model is ...

A planar microstrip ring resonator structure on alumina was developed using the commercial FEM software COMSOL. Design parameters were evaluated, eventually leading to an optimized design of a miniaturized microwave gas sensor. The sensor was covered with a zeolite film. The device was successfully operated at around 8.5 GHz at room temperature as a humidity sensor. In the next step, an additio...

Abstract Polyindole is considered an excellent conducting polymer with interested properties for different applications. A novel polyindole (PIn)/CuInS (CIS)/ZnS quantum dots (QDs) nanocomposite was synthesized via in situ polymerization of PIn presence CIS/ZnS QDs. By investigating the effect QDs on optical PIn, it found that band gaps QDs, and PIn/CIS/ZnS were 3.24 eV, 4.68 eV 3.44 respective...

This paper discussed the synthesis of LTA zeolite from Pinheiro clay (PIN) aiming for adsorption CO2. To obtain LTA-PIN zeolite, PIN was submitted to acid treatment, followed by calcination and hydrothermal treatment. These treatments promoted reorganization crystalline structure PIN, leading with 95.79% purity confirmed XRD, SEM, XRF, FTIR results. The performance similar one standard zeolite....