ejectors and mechanical vacuum systems
Micro Electronic and Mechanical Systems 2009 Part 1 ppt
... Micro Electronic and Mechanical Systems, Edited by Kenichi Takahata p cm ISBN 978-953-307-027-8 Preface The miniaturization and performance improvement in semiconductor devices and integrated circuits ... developments in micro electronic and mechanical systems The book addresses a wide range of fundamental and practical issues related to MEMS, advanced metal-oxide-semiconductor (MOS) and complementary MOS ... “bulk“ microdevice and (b) “3-D membrane microdevice“ Micro Electronic and Mechanical Systems The purpose of this chapter is to introduce the concept of 3-D membrane microdevices and highlight some...
Ngày tải lên: 21/06/2014, 18:20
Micro Electronic and Mechanical Systems 2009 Part 2 pot
... methanol reformer and the combustor 34 Micro Electronic and Mechanical Systems 2.4 Results and discussion The performance of the reformer was measured at various test conditions and an optimum operation ... 2.03% CH4, and 25% CO2 was used in the test of PROX reactor The carbon monoxide conversion increased with the oxygen-to-carbon ratio and the reactor 44 Micro Electronic and Mechanical Systems temperature ... function of the duration 240 48 Micro Electronic and Mechanical Systems Conclusion and future research 5.1 Conclusion The design, fabrication and performance evaluation of micro methanol reformer...
Ngày tải lên: 21/06/2014, 18:20
Micro Electronic and Mechanical Systems 2009 Part 3 ppt
... very rich and diverse group in itself and includes a number of subclasses Some of those include 78 Micro Electronic and Mechanical Systems nanopatterning/deposition of various planar and 3D structures ... various size-exclusion-based separations and extractions to molecular 80 Micro Electronic and Mechanical Systems and microbial sieves for separation and purification of organic agents (for instance, ... Electronic and Mechanical Systems There are several main classes of inorganic freestanding structures in dependence on their composition The simplest one includes pure element nanomembrane and may...
Ngày tải lên: 21/06/2014, 18:20
Micro Electronic and Mechanical Systems 2009 Part 6 pptx
... Micro Electronic and Mechanical Systems the repeatability, accuracy and data reliability of various measurement methods for mechanical properties of MEMS materials, the manufacturing and testing technology ... composition, pressure, temperature, frequency and power of a discharge, flow rate and configuration, etc Because of numerous 186 Micro Electronic and Mechanical Systems and complex interconnections of the ... determining mechanical properties of freestanding thin films and MEMS materials Journal of the Mechanics and Physics of Solids, 51, (2003) 47-67, ISSN: 0022-5096 Sharpe, W.N.Jr (2001) Mechanical...
Ngày tải lên: 21/06/2014, 18:20
Micro Electronic and Mechanical Systems 2009 Part 10 ppt
... ratio of: (a) - (30/70) wt.%, (b) - (50/50) wt.% and (c) (70/30) wt.% 312 Micro Electronic and Mechanical Systems The different initial Ti/Al ratio and the resulting different annealing temperatures ... the interface and in the contact layer The presence of carbon in the contact layer and at the interface could become a potential source of contact 314 Micro Electronic and Mechanical Systems degradation ... vacancies Both oxygen 320 Micro Electronic and Mechanical Systems vacancies and unsaturated Si atoms in the oxide are concentrated mostly near the interface and they both act as the trapping centers...
Ngày tải lên: 21/06/2014, 18:20
Micro Electronic and Mechanical Systems 2009 Part 12 pot
... 1.), three hidden units, and one output unit Weights and thresholds are given in Table 380 Micro Electronic and Mechanical Systems No Hidden-layer neurons (First figure stands for the input neuron) ... (for example, OC3G stands for open gate of transistor T3, and SC1DG stands for drain and gate shorted in transistor T1, Table 1.) As opposed to (Stopjakova et al., 2004) and some others, the ... W+ and W- in Table 1.) were introduced, totalling 10 faults per transistor The soft faults considered here are 392 Micro Electronic and Mechanical Systems expected to model design errors and, ...
Ngày tải lên: 21/06/2014, 18:20
Micro Electronic and Mechanical Systems 2009 Part 15 pot
... comparison to the standard h.263 code References Amer, A and E Dubois (2005) “Fast and Reliable structure-oriented Video Noise compression standards”, Proc SPIE, Vol CR60: Standards and Common Interfaces ... cylindrical and spherical coordinate systems 2.1 Introduction Classical expression for free photon energy is: 2 E = c p x + p y + p z2 , (1.1) where c is the light velocity in vacuum and px, py and pz ... Electronic and Mechanical Systems are very similar to (3.4) Comparing (3.4) to (3.5) we can establish the correspondence ˆ ˆ ˆ between spin operator components and matrices α , β and χ : ˆ ˆ...
Ngày tải lên: 21/06/2014, 18:20
Mechanisms and Mechanical Devices Sourcebook - Chapter 3
... APPLICATIONS Viscous liquid adhesives are used to glue fabrics and paper, apply paper labels, make cardboard and wooden boxes and shoes, and bind books Specially designed machines are required if ... would bend and jam Avoid these designs, if possible—Especially if automatic assembly methods will be employed A rotary screw-feed handles screws, headed pings, shouldered shafts, and similar ... lifts the capacitor and it is carried to the required position by the action of a cam and follower Label feed Labels are taken out of the hopper by a carrying arm with a vacuum unit to hold the...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 4
... 4, and T3/T4 = L3/L4 = 2/3, where T3 and T4 are the numbers of teeth on gears and T1 and T2 will denote the numbers of teeth on gears and 98 and S = ∆θ 3/θ30 Hence θ30(1 + S)L3 = 360º For S = and ... = r4 and r2 = r3, there is no “differential motion” and the output remains stationary Thus if one gear pair, say and 4, is made partly circular and partly noncircular, then where r2 = r3 and r1 ... pulleys, and linkages (see drawing) instead of the usual genevas or cams is capable of cyclic start -and- stop motions with smooth acceleration and deceleration Developed by Eric S Buhayar and Eugene...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 5
... Dynamic and static balancing is simplified when an expanding wheel is attached to a nonexpanding main wheel As a pulley, an expanding wheel can have a steel band fastened to only one section and ... 11:45 AM Page 134 TWELVE EXPANDING AND CONTRACTING DEVICES Parallel bars, telescoping slides, and other devices that can spark answers to many design problems Figs and Expanding grilles are often ... steel band, or rope around the drum is fastened to the driving and driven members; sprocket-wheels and chain can replace the drum and belt GEARS Fig Matching gear-segments Fig 10 Racks and coupled...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 6
... Bearing adjustment This screw arrangement is a handy way for providing bearing adjustment and overload protection Rapid and slow feed With left- and right-hand threads, slide motion with the nut locked ... boasts high mechanical stability for use in precision instruments and that there be a zero gap between sector and saddle nut Pivots with a Twist A pair of opposed, taut, flexible bands in combination ... frictionless, stictionless and negligible hysteresis characteristics The bearing is radiation-resistant and can be used in high vacuum conditions or in environments where there is dirt and contamination...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 7
... increasing mechanical advantage to counteract the resistance of the material being compressed A rotating handwheel with a differential screw moves nuts A and B together, and links I and II are ... DIFFERENTIAL WINCH TO CONTROL SYSTEMS Known for its mechanical advantage, the differential winch is a control mechanism that can supplement the gear and rack and four-bar linkage systems in changing rotary ... equations of motion Fig A standard differential winch consists of two drums, D1 and D , and a cable or chain which is anchored on both ends and wound clockwise around one drum and counterclockwise around...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 8
... power losses in the gears and bearings and from windage and churning of lubricant gear power: A gear’s load and speed capacity, determined by gear dimensions and type Helical and helical-type gears ... motor comparable in size and power to those used in standard reel-to-reel recorders, and a large bi-peripheral flywheel and sturdy capstan that reduces wow and flutter and drives the tape A patent ... manufacturing and alignment and (2) thermal and vibrational changes in the sizes and positions of the meshing components One of the benefits is a reduction of gear-toothcontact noise and vibration...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 9
... requirements of MIL-E-5400, class and MILK-3926 specifications Applications were seen in counter and reset switches and controls for machines and machine tools, radar systems, and precision potentiometers ... faster Edges of the clutch bands carry the entire load, and there is also a compound action of one band upon another As the torque builds up, each band pushes down on the band beneath it, so each ... bi-directional slip and independent torque capacities for the two directions of rotation It requires two springs, one right-handed and one left-handed, for coupling the input, intermediate and output...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 10
... on winding reels and similar drives, or for driving independent parts of a machine in synchronism MECHANICAL DRIVES A band brake is used on coil winders, insulation winders, and similar machines ... between the pin and the rotating finger must be shorter than the thread pitch so the pin can clear the finger on the first reverse-turn The rubber ring and grommet lessen the impact and provide a ... help reduce the impact force 347 Sclater Chapter 10 5/3/01 1:07 PM Page 348 MECHANICAL SYSTEMS FOR CONTROLLING TENSION AND SPEED The key to the successful operation of any continuous-processing...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 11
... completely encased and cannot expand beyond its original diameter The standard pump is made of bronze and will handle volumes to 15 gpm The Squeegee develops a vacuum of 25 in of mercury and will work ... a vacuum before connecting a diffusion pump; to evacute light bulbs and electronic tubes, and to vacuum dry and distill Single pumps draw vacuums from to microns; in series to 0.5 micron, and ... liquids and semisolids, pump vacuums, and boost oil pressure ORIGINALLY DESIGNED for use in the marine field, this gearless pump was made from stainless steel, monel, and bronze for handling...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 13
... opposite sense to ψ14, ψ13 and ψ12 This establishes points A′2, A′3 and A′4, but here A′3 and A′4 coincide because of symmetry of A3 and A4 about A0B0 Draw lines A1A′2 and A1A′4, and the perpendicular ... landinggear retraction systems, and it can be applied to any four-bar linkage designs that meet the requirements discussed here 447 Sclater Chapter 13 5/3/01 1:32 PM Page 448 DESIGN CURVES AND ... Over-centering toggle mechanisms, as shown in Fig 1, are widely used in mechanical and electrical switches, latch mechanisms and mechanical overload controls These toggles also serve as: (1) detents...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 14
... elements and icons, and 2D drafting and detailing capability, which support design collaboration and compatibility among CAD, CAM, and computer-aided engineering (CAE) applications Designers and engineers ... interconnect plane and three mechanical layers can be micromachined, and SUMMiT V Technology, a similar five-level process except that four mechanical layers can be micromachined Sandia offers this ... microelectromechanical systems (MEMS) LIGA permits the fabrication of larger, thicker, and more durable components with greater height-to-width ratios They can withstand high pressure and temperature...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 15
... revised and edited the Second Edition of Mechanisms and Mechanical Devices Sourcebook after the death of Mr Chironis The late Nicholas P Chironis developed the concept for Mechanisms and Mechanical ... in the military/aerospace industry and a Boston engineering consulting firm before changing his career path to writing and editing on electronics and electromechanical subjects He was a staff ... Sourcebook, and was the author/editor of the First Edition He was a mechanical engineer and consultant in industry before joining the staff of Product Engineering magazine as its mechanical design...
Ngày tải lên: 22/10/2012, 14:26