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ITC/USA 2009 Conference Proceedings / The Forty-Fifth Annual International Telemetering Conference and Technical Exhibition / October 26-29, 2009 / Riviera Hotel & Convention Center, Las Vegas, Nevada

Chan Lai To = 硏究巨磁阻自旋閥磁記錄頭的靈敏度與溫度之關係 / 陳麗圖. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2000. / Includes bibliographical references (leaves 80-83). / Text in English; abstracts in English and Chinese. / Chan Lai To = Yan jiu ju ci zu zi xuan fa ci ji lu tou de ling min du yu wen du zhi guan xi / Chen Litu. / Abstracts --- p.ii / 論文摘要 --- p.iii / Acknowledgements --- p.iv / Table of Contents --- p.v / List of Figures --- p.viii / Abbreviations --- p.xi / Chapter Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- History of Data Storage in Computers --- p.1 / Chapter 1.2 --- Structure and Working Principle of the Recording Head of a Magnetic Disk Storage device --- p.2 / Chapter 1.2.1 --- Structure of a Current Magnetic Recording Head --- p.2 / Chapter 1.2.2 --- Principle of Recording --- p.6 / Chapter 1.2.2.1 --- General Operating Principle of a Magnetic Recording Head --- p.7 / Chapter 1.2.2.2 --- Principle of Recording using AMR Elements --- p.9 / Chapter 1.2.2.3 --- Principle of Recording using GMR Elements --- p.14 / Chapter 1.3 --- Reliability of Magnetic Recording Heads --- p.23 / Chapter 1.3.1 --- Importance in the Determination of Reliability of Magnetic Recording Heads --- p.23 / Chapter 1.3.2 --- Current Relevant Reliability Issues in the Field --- p.23 / Chapter 1.4 --- Objectives of the Thesis Work --- p.24 / Chapter Chapter 2 --- Methodology --- p.25 / Chapter 2.1 --- Sample Preparation --- p.25 / Chapter 2.2 --- Principle of Amplitude Thermal Robustness Measurements --- p.28 / Chapter 2.2.1 --- Black's Equation --- p.28 / Chapter 2.2.2 --- Thermal Coefficient (TC) or Temperature Resistivity Coefficient Test --- p.29 / Chapter 2.2.3 --- Temperature Rise (TR) --- p.31 / Chapter 2.2.4 --- Thermal Electrical (TE) Stress Test (Accelerated Test) --- p.34 / Chapter 2.2.5 --- Maximum MR Resistance for Normal Device Operation --- p.38 / Chapter 2.3 --- Magnetic Field Effects Induced by the Biasing Current in an ATR Measurement --- p.40 / Chapter Chapter 3 --- Experimental Results and Data Analysis --- p.41 / Chapter 3.1 --- Results of the ATR Measurement --- p.43 / Chapter 3.1.1 --- Thermal Coefficient (TC) Test Result --- p.43 / Chapter 3.1.2 --- Temperature Rise (TR) Results --- p.48 / Chapter 3.1.3 --- Thermal Electrical (TE) Stress Test Result --- p.51 / Chapter 3.1.4 --- Maximum MR Resistance for Normal Device Operation --- p.60 / Chapter 3.2 --- Preliminary Data from the Magnetic Field Effects Induced by the Biasing Current in an ATR Measurement --- p.61 / Chapter Chapter 4 --- Discussion of Results and Failure Mechanisms --- p.62 / Chapter 4.1 --- Summary of the ATR characteristics of GMR heads --- p.62 / Chapter 4.2 --- "Comparison of ATR characteristics of AMR and GMR, and Discussion of Failure Mechanisms" --- p.63 / Chapter 4.2.1 --- ATR characteristics and Failure Mechanisms of AMR --- p.63 / Chapter 4.2.1.1 --- Summary of ATR characteristics of AMR heads --- p.63 / Chapter 4.2.1.2 --- Electromigration (EM) Induced Failure in AMR --- p.65 / Chapter 4.2.1.3 --- Diffusion Induced Failure in AMR --- p.67 / Chapter 4.2.2 --- Possibility of Diffusion Induced Failure in GMR --- p.68 / Chapter 4.2.3 --- Possibility of EM Induced Failure in GMR --- p.69 / Chapter 4.3 --- Magnetic-field Dependent ATR characteristics of GMR --- p.69 / Chapter 4.3.1 --- Temperature Dependence of the Exchange Coupling Field --- p.70 / Chapter 4.3.2 --- Rotation or Reversal of Magnetic Moments of the Pinned Layer --- p.75 / Chapter 4.3.3 --- Relaxation of the Magnetization of the Pinning Layer --- p.77 / Chapter Chapter 5 --- Conclusions and Suggestions for Future Work --- p.78 / References --- p.80

Han, Qinglong. / Thesis Ph.D. Chinese University of Hong Kong 2016. / Includes bibliographical references (leaves 141-148). / Abstracts also in Chinese. / Title from PDF title page (viewed on 25, October, 2016).

The link to subjective parameters and objective parameters in the field of room acoustics has been the source of much research. This thesis surveys some of the available objective room acoustical analysis methods, quantify their advantages and disadvantages with respect to the measurement of acoustical qualities of professionally operated critical listing rooms, and implements these methods in a range of critical listening rooms. In conjunction with the objective room analysis, a subjective component of research was also performed. A series of anechoically recorded standard instrument sounds were presented to professional listeners in their critical listening spaces with the listeners asked to alter the sounds to taste: to

Higher data rate hard disk drives(HDD) and improved read channel electronics are demanding preamplifier performance be extended well beyond 1 Gb/s. Historically, preamplifier power requirements were of low priority; however, with increased demand for battery powered devices such as laptops, MP3 players, personal video recorders, andmanyother wireless hand-held devices, power consumption has become an important design parameter.Furthermore, in order to continue to increase drive capacities, new read-write head technologies(vertical recording and TGMR heads) are demanding innovative preamplifier circuitsolutions.Today's production preamplifiers possess a wide band response of 2.5 MHz-600 MHz; however next generation preamplifiers willrequire response greater than 250 KHz-1 GHz.Low corner frequencies below 250 KHz present read recovery (sleep-to-read, write-to-read, etc) challenges which can limit drive capacity. This project targets a > 2 Gb/s TGMR (tunneling giantmagneto-resistive) read path for verticalrecording HDDs. A high performance BiCMOS process (IBM's 0.5?m 5HP process)is essential due to the large transconductances, low noise and highspeed requirements of the read path's first stage. System frequency limitations at the input are a result of the large TGMR read sensor and preamplifier input capacitance. Due to read head and preamplifier manufacturingvariations, resistive feedbackaroundthe firststage is usedto seta controlled input impedance targeted to match the interconnect transmission line. Head resistance variations lead to gain variations; however, the TGMR element becomes more sensitive with larger resistance. This, to a first order approximation, acts like an automatic gain control and reduces variations in gain due to the head.

The goal of this work is to design and fabricate an autonomous acoustic recording system which is low cost, reconfigurable and portable for acoustic research. The system consists of four components, including a compact single-board computer (Celeron 1G), a 12-bit A/D converter (PCM-3718HO), a 20/40 dB gain amplifier and an useful power management circuit board. C and LabVIEW programs with multiple threads are developed to control the I/O's, digitize the underwater acoustic signals and stream data to the hard disk continuously. Currently, the throughput of data stream attains to 83 kHz. It were tested by six significant experiments to show its feasibility. At first, taking the function generator as signal source to verify no distortion caused by the system. Two ITC-6050C hydrophones are connected to the system as the receivers. The system was tested with experimental propeller producing broadband noise to calibrate the hydrophones in the experimental sink. To verify their performance, the receivers also work with the calibrated one B & K 8104 for reference. In order to understand the influence of self-noise, the system is planned to record known signal producing by hydrophone CTG-0708. By repeating similar calibration experiment, the system operates with an autonomous recording system Bioacoustic probe to understand what deficiency we should improve afterward. Further, a field test was conducted in the designated natural laboratory of shallow bay area. Post-processing of the data resulted in range-frequency plot shows that the interference pattern reported in the literature was captured. According to above-mentioned tesing, the system can be applied to underwater acoustics. This system, connected with multiple hydrophones, will be applied in the research for target detection, the harbor protection and so on.

The construction industry is known for its high accident rate which leads to numerous fatalities every year. Currently, the Occupational Safety and Health Administration (OSHA) requires injury/illness recording forms to be completed only for injuries requiring medical treatment and fatalities. The assertion of this paper is that underlying problems can be best determined through the causes of first-aid injuries that have the potential to prevent serious injuries in the future. Therefore, by classifying and recording first-aid cases on project sites, the common trend type of injury can be followed and appropriate measures can be taken to eliminate hazards. The main objective of this research is to establish a comprehensive standardized database to record first-aid injury cases, injuries requiring medical treatment and fatalities all in one. The recording format described in this research will facilitate the analysis of the data in a more effective manner which can subsequently be used to develop pre-emptive measures to eliminate common causes for construction injuries. In order, to create the Form, 900 sets of injury data were obtained from an industrial construction firm and analyzed. These data provided a good indication of the classification system adopted by industries today. The proposed Injury and Illness Database/Form (I

The Historic American Buildings Survey (HABS) is one of the oldest federal programs in the United States. In 1933, the HABS culture of documentation started with the mission of creating a permanent record of the nation's architectural heritage. Since the inception of the program, the formal documentation methodology has been measured drawings, large-format photographs, and written histories. HABS documentation accentuates the act of drawing as a mediating conversation between the documenter and the historic environment. In a typical HABS project, the documenter is immersed in the historic setting by hand measuring the structure and creating field notes. The documenter's intimate access to the artifact develops his awareness of cultural heritage and helps cultivate an appreciation for the compositional sensibilities of the architectural precedents. However, the HABS culture of documentation has been fine-tuned to incorporate a number of digital technologies into documentation projects. When projects involve issues of logistics, time, and cost, HABS professionals utilize a host of digital methodologies to produce measured drawings. Although HABS prepares deliverables to meet the archival standards of the Library of Congress, the hardware and software necessary to recognize digital files have a limited lifespan that makes them unacceptable for use in the Library. Only measured drawings that use archival ink on stable translucent material, accompanied by negatives on safety film, can be submitted to the Library. Thus, if HABS pursued only digital technologies and deliverables, the effects of this approach on the quality of the documenter's engagement with cultural heritage would pose a significant question. This study addressed the question of how the HABS culture of documentation evolved in regards to drawing and technology, and how this relationship might be transformed in the future. Using HABS as a focus of inquiry is important in order to illuminate similar dynamics in heritage projects that utilize digital technologies. The methodology used in this study included a literature review, participant observations, and an analysis of documentation projects, as well as in-depth interviews with HABS staff, project participants, private practitioners, and academicians. The outcome of the study will be recommendations to heritage professionals for a future that resides in digital means without compromising the qualities that the HABS experience has offered to generation of documenters.