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ASME International Mechanical engineering Congress and Exposition (IMECE2015)

作者： Salama, Mostafa vantsevich, vladimir v. Univ Alabama Birmingham Dept Mech Engn Birmingham AL 35233 USA

ISBN: (纸本)9780791857557

This paper presents a project developed at the University of Alabama at Birmingham (UAB) aimed to design, implement, and test an off-road Unmanned Ground vehicle (UGv) with individually controlled four drive wheels that operate in stochastic terrain conditions. An all-wheel drive off-road UGv equipped with individual electric dc motors for each wheel offers tremendous potential to control the torque delivered to each individual wheel in order to maximize UGv slip efficiency by minimizing slip power losses. As previous studies showed, this can be achieved by maintaining all drive wheels slippages the same. Utilizing this approach, an analytical method to control angular velocities of all wheels was developed to provide the same slippages of the four wheels. This model-based method was implemented in an inverse dynamics-based control algorithm of the UGv to overcome stochastic terrain conditions and minimize wheel slip power losses and maintain a given velocity profile. In this paper, mechanical and electrical components and control algorithm of the UGv are described in order to achieve the objective. optical encoders built-in each de motor are used to measure the actual angular velocity of each wheel. A fifth wheel rotary encoder sensor is attached to the chassis to measure the distance travel and estimate the longitudinal velocity of the UGv. In addition, the UGv is equipped with four electric current sensors to measure the current draw from each dc motor at various load conditions. Four motor drivers are used to control the de motors using National Instruments single-board RIO controller. Moreover, power system diagrams and controller pinout connections are presented in detail and thus explain how all these components are integrated in a mechatronic system. The inverse dynamics control algorithm is implemented in real-time to control each de motors individually. The integrated mechatronics system is distinguished by its robustness to stochastic external disturbance

关键词： Stochastic systems

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Recent experience with design and manufacture of cine lenses 16

Recent experience with design and manufacture of cine lenses

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Conference on current developments in Lens design and optical engineering XvI

作者： Thorpe, Michael D. Dalzell, Kristen E. Raytheon ELCAN Opt Technol Midland ON Canada

ISBN: (纸本)9781628417449

Modern cine lenses require a high degree of aberration correction over a large and ever expanding image size. At low to medium volume production levels, these highly corrected designs also require a workable tolerance set and compensation scheme for successful manufacture. In this paper we discuss the design and manufacture of cine lenses with reference to current designs both internal and in the patent literature and some experience in design, tolerancing and manufacturing these lenses in medium volume production.

关键词： lens design compensators manufacturability cine

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Analysis of three-element zoom systems for laser beam expanders with tunable-focus lenses 16

Analysis of three-element zoom systems for laser beam expand...

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Conference on current developments in Lens design and optical engineering XvI

作者： Kulmon, Pavel Miks, Antonin Novak, Pavel Novak, Jiri Czech Tech Univ Fac Civil Engn Dept Phys Prague 16629 Czech Republic

ISBN: (纸本)9781628417449

Our work is focused on the problem of a theoretical analysis of imaging properties and an initial optical design of a three-element zoom optical system for laser beam expanders using lenses with a tunable focal length. Equations that enable to calculate basic paraxial properties and parameters of such optical systems are derived Finally, the derived equations are applied on an example of calculation of parameters of the three-element zoom system for the laser beam expander.

关键词： geometric optical design first-order optics zoom lenses laser beam expander Gaussian beam tunable-focus lenses

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Compact Rotating In-Plane HTS Magnet for X-Ray Scattering Sample Environment

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IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIvITY 2016年第4期26卷

作者： Huang, T. Pooke, D. Chamritski, v. McCrohon, M. HTS 110 Ltd Lower Hutt 5010 New Zealand

We report the design and testing of a compact 0.8-T magnet for x-ray magnetic scattering and x-ray magnetic circular dichroism experiments;the magnet can be physically rotated around a stationary sample to provide field rotation in the plane of the sample. Taking an H-frame design split horizontally in the sample plane, the resulting optical access is over 270 degrees, delivering greater than 180. scattering angle over the total field-angle range, and with an axial (out of plane) opening angle of over 8 degrees. To provide compatibility with an existing ultrahigh-vacuum chamber, the magnet was designed in the form of a long cylinder, with an outer diameter restricted to less than 150 mm and with a sample bore close to 32 mm in diameter. To meet the challenging dimensional and optical access requirements, a partial magnetic circuit was employed with second-generation high-temperature superconducting (HTS) coils utilized for their high engineering current density. This magnet exemplifies the compact high-performance magnets that are possible with HTS technology.

关键词： HTS magnet magnetic x-ray scattering UHv XMCD

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current density of carriers and emission rate in zinc selenide LED

Current density of carriers and emission rate in zinc seleni...

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International Conference on Electronic design (ICED)

作者： U.K. Sahbudin M.H.A. Wahid P. Poopalan N.A.M. Ahmad Hambali M.M. Shahimin S.N. Ariffin N.N.A. Saidi M.A.M. Azidin Semiconductor Photonics & Integrated Lightwave Systems (SPILS) School of Microelectronic Engineering Universiti Malaysia Perlis Perlis Malaysia Semiconductor Photonics & Integrated Lightwave Systems (SPILS) School of Microelectronic Engineering Universiti Malaysia Perlis Arau Perlis MY Faculty of Engineering National Defence University of Malaysia (UPNM) Kuala Lumpur

ISBN: (纸本)9781509021611

This work is based on the development of LED using a circular chip of ZnSe. Proper analyses of the proposed LED are performed by adding optical transition and nonradiative recombination processes. The voltage applied to the ZnSe LED ranges from 0 v to 3.5 v. The current-voltage characteristic and the flow of current density are obtained. At 2.5 v, the carriers move towards n-contact hence reduces the internal quantum efficiency. The carriers are observed to drift in opposite direction of the electric field until recorded voltage of 3.5 v where both carriers in line with the electric field. The emission at low voltage in p-layer is localized and caused the efficiency to reduce considerably.

关键词： Light emitting diodes Charge carrier processes II-vI semiconductor materials Zinc compounds current density Radiative recombination

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Integration design of rigid endoscope with different viewing angles 16

Integration design of rigid endoscope with different viewing...

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Conference on current developments in Lens design and optical engineering XvI

作者： Zhang, Lingyun Cheng, Dewen Wang, Yongtian Beijing Inst Technol Sch Informat Sci & Technol Dept Optoelect Engn Beijing 100081 Peoples R China

ISBN: (纸本)9781628417449

High definition and magnification rigid endoscope is a significant equipment in the examination and surgery. In this paper, the design of a high definition (HD) rigid endoscope with zero viewing direction is presented with a FOv of 70. The entrance pupil is 0.3 mm, achieved for the first time to our best knowledge. For the fabricated prototype, the theoretical resolution is 22.3 lp/mm at an object distance of 20 mm, and the depth of field (DOF) is 115 mm The performance is proved to be great for observation during diagnosis and surgery. Besides, the endoscope with non-zero viewing direction is more needful in some conditions such as observing and diagnosing lesions on inner walls of organs and tissues. In this paper, we present two designs with non-zero viewing direction for better applications.

关键词： optical design rigid endoscope high definition depth of field stray light

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Novel hybrid III:v concentrator photovoltaic-thermoelectric receiver designs

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AIP Conference Proceedings 2017年第1期1881卷

作者： Tracy K. N. Sweet Matthew H. Rolley Martin J. Prest Gao Min Cardiff School of Engineering Cardiff University Queen’s Buildings The Parade Cardiff. CF24 3AA. UK

This paper presents the design, manufacture and electrical characterization of novel hybrid III:v Concentrator Photovoltaic-Thermoelectric receivers. Addition of an encapsulating and spectral homogenizing single active surface secondary optic lens increased the solar cell electrical power output from 7.66mW (ALPHA no cooling) to 18.20mW (KAPPA with TE cooling). The effective optical concentration of the optics, based on short circuit current, was x2.4. A linear irradiance vs maximum power receiver output relationship was observed (R2=0.9978), confirming good optical alignment during manufacture and likewise internal current matching of the series-connected triple-junction cell. An in-depth COMSOL model for simulated evaluation of the synergistic thermally-dependent parameters inherent to hybrid devices was built and experimentally validated.

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Evolution of Knowledge Science: Myth to Medicine: Intelligent Internet-Based Humanist Machines

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2016年

作者： Ahamed, Syed v.

ISBN: (数字)9780128093559

ISBN: (纸本)9780128054789

Evolution of Knowledge Science: Myth to Medicine: Intelligent Internet-Based Humanist Machines explains how to design and build the next generation of intelligent machines that solve social and environmental problems in a systematic, coherent, and optimal fashion. The book brings together principles from computer and communication sciences, electrical engineering, mathematics, physics, social sciences, and more to describe computer systems that deal with knowledge, its representation, and how to deal with knowledge centric objects. Readers will learn new tools and techniques to measure, enhance, and optimize artificial intelligence strategies for efficiently searching through vast knowledge bases, as well as how to ensure the security of information in open, easily accessible, and fast digital networks. Author Syed Ahamed joins the basic concepts from various disciplines to describe a robust and coherent knowledge sciences discipline that provides readers with tools, units, and measures to evaluate the flow of knowledge during course work or their research. He offers a unique academic and industrial perspective of the concurrent dynamic changes in computer and communication industries based upon his research. The author has experience both in industry and in teaching graduate level telecommunications and network architecture courses, particularly those dealing with applications of networks in *** a current perspective of developments in central, display, signal, and graphics processor-units as they apply to designing knowledge systemsOffers ideas and methodologies for systematically extending data and object processing in computing into other disciplines such as economics, mathematics, and managementProvides best practices and designs for engineers alongside case studies that illustrate practical implementation ideas across multiple domains

关键词： computing \u0026 security artificial intelligence

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Landsat-swath Imaging Spectrometer design 16

Landsat-swath Imaging Spectrometer Design

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Conference on current developments in Lens design and optical engineering XvI

作者： Mouroulis, Pantazis Green, Robert O. van Gorp, Byron Moore, Lori Wilson, Daniel W. Bender, Holly A. CALTECH Jet Prop Lab Pasadena CA 91109 USA

ISBN: (纸本)9781628417449

We describe the design of a high-throughput pushbroom imaging spectrometer and telescope system that is capable of Landsat swath and resolution while providing better than 10 nm per pixel spectral resolution. The design is based on a 3200 x 480 element x 18 mu m pixel size focal plane array, two of which are utilized to cover the full swath. At an optical speed of F/1.8, the system is the fastest proposed to date to our knowledge. The utilization of only two spectrometer modules fed from the same telescope reduces system complexity while providing a solution within achievable detector technology. Predictions of complete system response are shown. Also, it is shown that detailed ghost analysis is a requirement for this type of spectrometer and forms an essential part of a complete design.

关键词： Imaging spectrometer Landsat Dyson spectrometer

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Progress towards a multi-modal capsule endoscopy device featuring microultrasound imaging

Progress towards a multi-modal capsule endoscopy device feat...

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IEEE International Ultrasonics Symposium (IUS)

作者： Lay, H. S. Qiu, Y. Al-Rawhani, M. Beeley, J. Poltarjonoks, R. Seetohul, v. Cumming, D. Cochran, S. Cummins, G. Desmulliez, M. P. Y. Wallace, M. Trolier-McKinstry, S. McPhillips, R. Cox, B. F. Demore, C. E. M. Univ Glasgow Sch Engn Glasgow Lanark Scotland Heriot Watt Univ Sch Engn & Phys Sci Edinburgh Midlothian Scotland Penn State Univ Mat Res Inst University Pk PA 16802 USA Univ Dundee Sch Med Dundee Scotland Univ Toronto Phys Sci Platform Sunnybrook Res Inst Med Biophys Toronto ON Canada

ISBN: (纸本)9781467398978

current clinical standards for endoscopy in the gastrointestinal (GI) tract combine high definition optics and ultrasound imaging to view the lumen superficially and through its thickness. However, these instruments are limited to the length of an endoscope and the only clinically available, autonomous devices able to travel the full length of the GI tract easily offer only video capsule endoscopy (vCE). Our work seeks to overcome this limitation with a device ("Sonopill") for multimodal capsule endoscopy, providing optical and microultrasound (mu US) imaging and supporting sensors(1). mu US transducers have been developed with multiple piezoelectric materials operating across a range of centre frequencies to study viability in the GI tract. Because of the combined constraints of mu US imaging and the low power / heat tolerance of autonomous devices, a hybrid approach has been taken to the transducer design, with separate transmit and receive arrays allowing multiple manufacturing approaches to maximise system efficiency. To explore these approaches fully, prototype devices have been developed with PvDF, high-frequency PZT and PMN-PT composites, and piezoelectric micromachined ultrasonic transducer arrays. Test capsules have been developed using 3D printing to investigate issues including power consumption, heat generation / dissipation, acoustic coupling, signal strength and capsule integrity. Because of the high functional density of the electronics in our proposed system, application specific integrated circuits (ASICs) have been developed to realise the ultrasound transmit and receive circuitry along with white-light and autofluorescence imaging with single-photon avalanche detectors (SPADs). The ultrasound ASIC has been developed and the SPAD electronics and optical subsystem have been validated experimentally. The functionality of various transducer materials has been examined as a function of frequency and ultrasound transducers have been developed to operate

关键词： endoscopy microultrasound prototyping pre-clinical capsules

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