3854 research outputs found
Sort by
Measuring Dependence in Uncertainty Should Start in the Introduction to Probability and Statistics
Get PDFMethods and Apparatus for Electrical Stimulation
Get PDFA method of treating a neurological condition in a patient, the method including the step of applying an electrical stimulation from conductors to the patient\u27s head at a stimulation application site. In some embodiments, the electrical stimulation includes a composite electrical signal further comprising at least one signal form configured to provide long-term treatment of the neurological condition and at least one signal form configured to provide analgesia for short-term pain relief. The invention also provides an electrical stimulation apparatus having an electrical signal generator adapted to provide an electrical signal form configured to provide long-term treatment of a neurological condition and to provide an electrical signal form configured to provide analgesia for short-term pain relief
Harmonic Forcing of a Two-Segment Elastic Rod
No full textThis work is on the motions of non-homogeneous elastic rods. In a previous work the natural frequencies and associated mode shapes were determined for a two-segment rod, in which the geometric and material properties were constant in each segment. Here the steady state response due to harmonic forcing is investigated using two strategies. The first employs the exact displacement equations. For harmonic forcing in time, the response is periodic and general solutions to the resulting differential equations can, in principle, be found for each segment. The constants involved are found from boundary and interface conditions and then response, as a function of forcing frequency, can be obtained. The procedure is cumbersome and problematic if the forces vary spatially, due to difficulties in finding “particular integrals”. An alternative method is developed in which geometric and material discontinuities are modeled by continuously varying functions (here logistic functions). This leads to a single differential equation with variable coefficients, which is solved numerically using MAPLE®’s PDE solver. For free-fixed boundary conditions and spatially constant force good agreement is found between the two methods, lending confidence to the continuous varying approach, which is then used to obtain response for spatially varying forces
Fiber-Optic Sensor Assembly
Get PDFA fiber-optic force and displacement sensor includes a mirror comprising a plurality of sectors extending from a center point to a peripheral edge. Each of the sectors has a high reflectance corresponding to only one of a plurality of single wavelength light beams having different wavelengths transmitted from a laser light source. A method of measuring force and displacement includes measuring the radiant flux between each of a plurality of reflected single wavelength light beams that change as the area of the sectors are displaced towards and away from a center of projection of a combination light beam that comprises the plurality of single wavelength light beams projected towards the center point of the mirror when the mirror is in a rested position. Forces acting upon the mirror are measured as a function of the displacement of the mirror and the transverse and the axial stiffness of a connector
SMaRT as a Cryptographic Processor
Get PDFSMaRT is a 16-bit 2.5-address RISC-type single-cycle processor, which was recently designed and successfully mapped into a FPGA chip in our ECE department. In this paper, we use SMaRT to run the well-known encryption algorithm, Data Encryption Standard. For information security purposes, encryption is a must in today’s sophisticated and ever-increasing computer communications such as ATM machines and SIM cards. For comparison and evaluation purposes, we also map the same algorithm on the HC12, a same-size but CISC-type off-the-shelf microcontroller, Our results show that compared to HC12, SMaRT code is only 14% longer in terms of the static number of instructions but about 10 times faster in terms of the number of clock cycles, and 7% smaller in terms of code size. Our results also show that 2.5- address instructions, a SMaRT selling point, amount to 45% of the whole R-type instructions resulting in significant improvement in static number of instructions hence code size as well as performance. Additionally, we see that the SMaRT short-branch range is sufficiently wide in 90% of cases in the SMaRT code. Our results also reveal that the SMaRT novel concept of locality of reference in using the MSBs of the registers in non-subroutine branch instructions stays valid with a remarkable hit rate of 95%
Organic Resin Laminate, Methods of Making and Ssing the Same, and Articles Comprising the Same
Get PDFAn organic resin laminate comprising an organic resin substrate and a multilayer coating system thereon has weather resistance and mar resistance. The multilayer coating system includes an outermost layer (I) which is a hard film resulting from plasma polymerization of an organosilicon compound and an intermediate layer (II) which is a cured film of a composite coating composition (2) comprising inorganic oxide nanoparticle and vinyl copolymer
Roots Air Management System with Integrated Expander
Get PDFPEM fuel cells remain an emerging technology in the vehicle market with several cost and reliability challenges that must be overcome in order to increase market penetration and acceptance. The DOE has identified the lack of a cost effective, reliable, and efficient air supply system that meets the operational requirements of a pressurized PEM 80kW fuel cell as one of the major technological barriers that must be overcome. This project leveraged Roots positive displacement development advancements and demonstrated an efficient and low cost fuel cell air management system. Eaton built upon its P-Series Roots positive displacement design and shifted the peak efficiency making it ideal for use on an 80kW PEM stack. Advantages to this solution include: • Lower speed of the Roots device eliminates complex air bearings present on other systems. • Broad efficiency map of Roots based systems provides an overall higher drive cycle fuel economy. • Core Roots technology has been developed and validated for other transportation applications. Eaton modified their novel R340 Twin Vortices Series (TVS) Roots-type supercharger for this application. The TVS delivers more power and better fuel economy in a smaller package as compared to other supercharger technologies. By properly matching the helix angle with the rotor’s physical aspect ratio, the supercharger’s peak efficiency can be moved to the operating range where it is most beneficial for the application. The compressor was designed to meet the 90 g/s flow at a pressure ratio of 2.5, similar in design to the P-Series 340. A net shape plastic expander housing with integrated motor and compressor was developed to significantly reduce the cost of the system. This integrated design reduced part count by incorporating an overhung expander and motor rotors into the design such that only four bearings and two shafts were utilized
