Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 22 for “"HDD"”.
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Acquisition behavior for a HDD interpolative timing recovery system
Thesis (S.B. and S.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, June 1999.
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Advancing Manufacturing Quality Control Capabilities Through The Use Of In-Line High-Density Dimensional Data
… recent advancements in high-density dimensional (HDD) measurement technologies, such as 3D laser scanners, data-sets consisting of an almost complete representation of a manufactured part's geometry can now be obtained. While HDD data measurement devices have traditionally been used in reverse …
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The oligomerisation of propene over nickel oxide silica alumina
… by homogeneous decomposition deposition (HDD) were investigated and compared with nickel oxide silica alumina catalysts prepared by the techniQues of impregnation (IMP) and co-precipitation (SG). Amongst others. the effect of the nickel content. reacti6n temperature and pressure, and water …
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Implications of climate change on energy demand and growing-degree days
… are heating-degree days and cooling-degree days (HDD/CDD hereafter). Since the WWII era, these simple indicators have proven useful to energy utilities and military installations to anticipate heating and cooling demand. Further, a metric used to estimate growing potential for various crops and …
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Multidimensional Warnings: Determining an Appropriate Stimulus for a Curve-Warning Device
… and subjective measurements. Objectively, the HDD and HUD were comparable with respect to performance, although the participants tended to favor the HDD in their subjective ratings. The throttle push-back did little to positively impact the performance measurements, and based on participant …
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Environmental considerations of pipeline installation methods through watercourses
Horizontal Directional Drilling (HDD) is a trenchless method used during pipeline installation that is effective at minimizing disturbance on the surrounding environment. The traditional method of pipeline installation under watercourses is termed isolated open-cut, where surface and subsurface …
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Low-temperature magnetic force microscopy with a simple design: analyzing the magnetic domains of a simple hard disk drive
… our new LT-MFM, we studied two hard disk drives (HDD) and have concluded that their magnetic domain structure closely matches with other former studies on similar HDD samples. In addition, with its simple design and open architecture, our homebuilt LT-MFM has proved, once again, that a low cost …
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Whistler Waves: Modeling and Observations
… attempt to understand the filtering aspects of HDD. Statistical analysis was done in a separate study to determine common parameters and characteristics of narrow and wide ducting events. A total of 213 events were cataloged where 164 were narrow events. The narrow HDD were found to most …
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Temperature Dependent Robust Control Of Hard Disk Drives Using Parameter Varying Techniques
A hard disk drive (HDD) is a device that stores digital data by writing and reading magnetic signals onto a disk using a magnetic transducer. The data is organized into circular tracks that are less than 100 nm wide. Modern HDDs use a dual-state actuator to position the transducer onto these …
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The role of heat assisted magnetic recording in future hard disk drive applications
… market for ultrahigh areal density HAMR-based HDDs. HAMR-based HDD for portable applications could very well be a disruptive technology in the magnetic recording industry. Companies that intend to profit from this technology need to invest on its development and must try to be first-to-volume …
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High moment shield structures for improved linear density capability in thin film recording heads
An essential part of Hard Disk Drive (HDD) Areal Density Capability (ADC) growth is improving the linear resolution of the reader. Increasing reader shield saturation magnetisation is an attractive means to enable this as dynamic permeability would be expected to improve, thereby providing greater …
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Advances in Modeling and Signal Processing for Bit-Patterned Magnetic Recording Channels with Written-In Errors
… the storage mechanism for the hard-disk drive (HDD) industry, allowing for growth in areal densities approaching 0.5 Tb/in2. Under the current system design, further increases are limited by the superparamagnetic effect where the medium's thermal energy destabilizes the individual bit domains …
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Observation and characterisation of magnetisation ripple using Lorentz transmission electron microscopy
… permalloy composition of Ni80Fe20 in hard disk (HDD) read-write head design. In this work a conventional TEM, and LTEM study was undertaken to investigate the effect of ultra-thin Ni79Fe21 seed layers on the physical and magnetic properties of Ni45Fe55. The dramatic effect of seed layer addition …
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The Relationship between Meat Consumption and the Biological Determinants of Cardiovascular Disease Risk
… (chole), high density lipoprotein-cholesterol (HDD, low density lipoprotein (LDL), very low density lipoprotein (VLDL), platelet factor four (PF4), and beta-thromboglobulin (BTG). In addition, the blood pressure (BP) was determined.</p> <p>The systolic (p<0.001) and diastolic BP (p=0.016) were …
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Increase Driving Situation Awareness and In-vehicle Gesture-based Menu Navigation Accuracy with Heads-Up Display
… outperformed the Heads-Down Display (HDD) in participants’ preference, perceived workload, level 1 situation awareness, and secondary-task performance. However, to achieve this, the participants compensated by having poor driving performance and relatively longer visual distraction. …
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Systems and applications for persistent memory
… While the existing storage technologies (e.g., HDD and flash-based SSD) are limited in their performance, the most prevalent memory technology (DRAM) is unable to address the capacity and cost requirements of these applications. Emerging byte-addressable, non-volatile memory technologies (such …
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Environmental Performance Evaluation of Heating and Cooling Between Sustainable and Conventional Office Building
… surveys, applying Heating Degree Data (HDD) Evaluation and undertaking Life Cycle Assessment (LCA). LCA has played a key role in evaluating the long run environmental performance of heating and cooling systems. The LCA evaluated two performance indicators: a) energy consumption of …
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Latency Tradeoffs in Distributed Storage Access
… become the norm as the data center storage, the HDD-based KV structures result in high read, write, and space amplifications which becomes detrimental to both the SSD’s performance and endurance. Also note that regardless of how the storage systems are deployed, access to large amounts of storage …
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Essays on the Short-Term Impact of Minimum Unit Pricing Policy in Scotland
… the daily limit on the heaviest drinking day (HDD) in the last 7 days for harmful drinkers by 13, 26 and 12 percent respectively – all three indicators of policy effect at the intensive margin. Given that MUP is a targeted intervention aimed at reducing alcohol consumption and related harms of …
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Dynamic and quasi-static contact and scratch analysis of micro-nanoscale thin solid films with application to magnetic storage hard disk drives
… and disk in magnetic storage hard disk drives (HDD). Similar contact problems are encountered during the operation of other micromechanical systems like RF-MEMS switches where surface damage is observed after cyclic contact. One of the most critical elements of multilayer contact analysis is …
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