397 research outputs found
Stabilization of injection-locked lasers using spatial mode interference
No full textWe report the use of spatial-mode-interference, or tilt-locking, for the active stabilization of injection-locking of a Nd:YAG laser. We show that this control scheme is robust and adds negligible frequency noise to the injection-locked laserOttaway, D.J.; Gray, M.B.; Shaddock, D.A.; Hollitt, C.; Veitch, P.J.; Munch, J.; McClelland, David Ernes
Second-generation laser interferometry for gravitational wave detection: ACIGA progress
No full textReasonable event rate gravitational wave astronomy in the audio frequency detection band will require improving the sensitivity of long-baseline interferometer-based gravitational wave detectors currently under construction by at least a factor of 10. In this summary we report research being carried out by the Australian Consortium for Interferometric Gravitational Astronomy towards this end.D E McClelland, S M Scott, M B Gray, D A Shaddock, B J Slagmolen, A Searle, D G Blair, L Ju, J Winterflood, F Benabid, M Baker, J Munch, P J Veitch, M W Hamilton, M Ostermeyer, D Mudge, D Ottaway and C Hollit
Squeezed vacuum phase control at 2 μm
No full textWe demonstrate phase control for vacuum-squeezed light at a 2 μm wavelength, which is a necessary technology for proposed future gravitational wave observatories. The control scheme allowed examination of noise behavior at frequencies below 1 kHz and indicated that squeezing below this frequency was limited by dark noise and scattered light. We directly measure 3.9±0.2 dB of squeezing from 2 kHz to 80 kHz and 14.2±0.3 dB of antisqueezing relative to the shot noise level. The observed maximum level of squeezing is currently limited by photodetector quantum efficiency and laser instabilities at this new wavelength for squeezed light. Accounting for all losses, we conclude the generation of 11.3 dB of squeezing at the optical parametric oscillator.M. J. YAP, D. W. GOULD, T. G. MCRAE, P. A. ALTIN, N. KIJBUNCHOO, G. L. MANSELL, R. L. WARD, D. A. SHADDOCK, B. J. J. SLAGMOLEN, AND D. E. MCCLELLAN
Effect of LT-M mixture on the population of citrus nematode, Tylenchulus semipenetrans Cobb. in shaddock yard
No full text白柚屬於多年生果樹，無法以輪作方式減少病蟲害發生，在土壤環境條件適合植物寄生性線蟲生長的誘因下，線蟲病害遂成為白柚產業急需解決之重要問題。本省白柚線蟲病害經初步調查發現，以柑橘線蟲最為普遍且線蟲族群密度最高。目前防治柑橘線蟲的方法主要為施用殺線蟲劑，但是使用化學藥劑不僅會造成水源環境污染，破壞生態體系平衡，更可引起人畜中毒，影響消費及環保層面甚廣，並且導致殘毒累積及污染問題愈趨嚴重，而且多種劇毒之殺線蟲劑即將面臨被禁用的命運，因此發展非農藥防治的方法來管理作物線蟲病害是刻不容緩且應走的方向。近年來，國立中興大學植物病理學系植物線蟲病害研究室成功研製利用蝦蟹殼粉、糖蜜、篦麻粕、海草粉及黃豆粉所混合製成具有防治植物線蟲病害的LT-M有機添加物，利用此一添加物防治白柚柑橘線蟲其結果明顯發現，在處理組施用LT-M有機添加物與10%歐殺滅後，與對照組相比，顯著降低柑橘線蟲族群密度，並能抑制柑橘線蟲的族群高峰，如此增強植株生長勢及根系養分、水分的利用，可使白柚植株結果率增加及降低落果情形，提高果實甜度及重量，達到產質的提升，LT-M有機添加物處理組的結果率、結果數目及單果重明顯比10%歐殺滅處理組及對照組多出許多，此外處理組的白柚果實平均甜度亦比對照組多出1.5度。
Plant diseases caused by parasitic nematodes are widespread in Taiwan. The most destructive species in shaddock yard is citrus nematode, Tylenchulus semipenetrans, which causes serious problems. Current management of citrus nematode primarily relies on application of nematicide, however, because chemicals create a potential hazard to the environment and human health, alternatives to nematicides are desirable. Based on the effectiveness of controlling tested nematodes in the greenhouse, Laboratory for Management of Plant-parasitic Nematode Diseases, Department of Plant Pathology, NCHU has developed the mixtures - 40% crab shell powder, 40% castor pomace, 5% soybean powder, 10% marine algae powder and 5% molasses was formulated and added Streptomyces saraceticus, then named Lively Tiller Mixture (LT-M). The effect of LT-M mixture on the population of citrus nematode in shaddock yard has been conducted. The result showed that LT-M, applied at the rate of 20kg per shaddock tree, decreased significantly (P=0.05) the population density of citrus nematode compared to untreated control. Besides, LT-M also increased the percentage of fruiting, number of fruit, single fruit weight and sugar content during the two harvest seasons, respectively
The effect of a decentralized breathalyzer system on the DWI arrest rate in Houston
No full textPurpose: The purpose of this study was to show that through the decentralization of the Houston Police Department’s breathalyzer system, the arrest rate for Driving While Intoxicated would increase significantly over the predicted trend. Method: Five breathalyzer instruments were placed at each of the five police sub-stations located throughout the City of Houston. Along with the breathalyzers, telecopying devices were also installed to simplify the booking process between the police and the district attorney. The project was set up to run for a six-month period from December 1976 to May, 1977. The project was further limited to the days of Thursday, Friday, and Saturday between the hours of 8:00 pm to 3:00 am. For the purpose of this study, the months of December, 196, January 1977, and February 1977 were selected to study the impact of the project. Base data on the DWI arrests for a three-year period prior to the implementation of the project was gathered and from that data a prediction, based on past trends, was made for the months of December 1976, January 1977, and February 1977.This prediction was further divided into the days the project would not be in effect. DWI arrest data was then analyzed and compared to the predicted trend of both project and non-project days to determine if a significant increase was realized. Finally, a chi square was applied to the accumulated data for DWI arrests to determine if in fact the arrests statistics followed the predicted trend. Findings: According to the DWI arrest statistics gathered, a significant increase in the number of suspects arrested for Driving While Intoxicated during project days was recorded, with the exception of December,1976, the first month of project implementation. December 1976 project and non-project days closely followed the predicted trend. The project days in January and February of 1977, experienced a significant increase in the number of suspects arrested for Driving While Intoxicated. Non-project days during this two-month period, closely paralleled the predicted trends. This data was confirmed by a chi square of both project and non-project day DWI arrest statistics
An optical fibre-based frequency dissemination network for Australia
No full textAn optical-fibre network is being planned for distribution of optical and microwave reference frequencies in Australia. This network would connect a number of research facilities and the National Measurement Institute (NMI), allowing long-range comparison of frequency standards to high precision and providing reference signals for a wide range of applications. First results for transfer in the laboratory achieve a fractional frequency stability of 7×10-17 at an averaging time of 104 s for the distribution of an 80 MHz radio frequency signal. We present details of the technique used to cancel noise introduced by the fibre, describe the all-digital radio-frequency phasemeter used to characterise performance, and outline plans for the further development of the network.Yabai He, Magnus T. L. Hsu, Malcolm B. Gray, Michael J. Wouters and R. Bruce Warrington, Andre N. Luiten, Brian J. Orr, Kenneth G. H. Baldwin and Daniel A. Shaddock, Guido Abe
A descriptive analysis of the relationship between drinking behavior and recidivism in the Texas Department of Corrections
No full textPurpose: The purpose of this study was to research the role of drinking behavior among a sample of Texas Department of Corrections' recidivists. This was done by investigating the connection of drinking behavior, both quantity and frequency with recidivism.
To investigate this area, the following questions were asked:
1.
What is the extent of alcohol use among Texas Department of Corrections' recidivists?
2.
What is the incidence of various types of drinking behavior found within the recidivist population?
3.
Are there any significant differences in drinking behavior when recidivists are categorized by selected demographic data?
4.
Are there any significant differences in drinking behavior when recidivists are categorized by offenses for which they are presently incarcerated?
Methods: The methods used in the study were:
1. The administering of a structured questionnaire
entailing twenty-two questions in which demographic data, drinking behavior information and criminal background data were gathered on a sample of Texas Department of Corrections' recidivists.
2. To determine, by utilizing Chi Square analysis (x 2), the significance of drinking behavior to the selected demographic variables of race, age, education and offense for which presently incarcerated.
Findings:
1. The study indicates that there is a significant relationship between drinking behavior and the demographic variable, race.
2. Drinking behavior appears not to be significantly related to the demographic variables of age and educational attainment.
3. Drinking behavior appears not to be significantly related to type of crime for which the recidivists are presently incarcerated.
4. Use of alcoholic beverages occurs at a high frequency within the recidivist population.
5. The number of drinkers (83.3%) greatly outnumber the abstainers (11.7%).
6. And finally, approximately two-thirds of the recidivists sampled can be categorized as moderate to heavy drinkers
Alcohol: A social dilemma :a critical analysis of a course in alcohol education
No full textThe purpose of this research project was to evaluate a course designed to instruct students in all aspects of alcohol use and abuse. The origin of the study was the creation of a new course at the Institute of Contemporary Corrections and the Behavioral Sciences at Sam Houston State University. The course, entitled “Alcohol: A Social Dilemma,” gives a general overview of the facts, figures, and problems associated with alcohol consumption and abuse. Using the course as a dispensing agent, subjects were tested prior to, and after, introduction of the independent variable (knowledge) to ascertain if any knowledge increase had occurred, and if the subjects had experienced any attitude change toward the problem of alcohol abuse. Methodology: There were two types of tests utilized in the measurement of the subjects involved in the study. To measure the subjects’ knowledge increase, they were administered teacher made pre and post objective tests for each of the teaching units of the course. Semantic differential tests, as detailed by Osgood, Tannenbaum, and Suci, were administered to discover any attitude changes. Use of the incidental sample was defended because of the limited generalization for which the results are intended. For simplicity and clarity, the knowledge increase was tested in each of the seven teaching units of the course, and overall. The attitude change was measured overall, and also for the specific areas of alcohol, alcoholism, social drinking, and driving while intoxicated. The tests were created by the author and tested for reliability and validity. All proved to be homogeneous, and therefore showed significant odd-even reliability. Although it cannot be measured, the perceptual concept of face validity was shown to be sufficient. Design of the study was an attempt to meet the goals of all experiments, demonstrate a relationship between the dependent and independent variable, and be able to generalize the results to the population from which the sample was drawn. Data were evaluated using the standard t test for correlated data. Null hypotheses were used and were tested at the .01 level of proof. Rejection at this level indicated only a one in 100 chance of being wrong. Procedures for the evaluation of results were essentially those of al standard t tests. Null hypotheses were postulated showing no difference between the means being studied. Any differences found between the means of the pre and post tests were treated as deviations. Finally, all deviations were treated to see if they were significant. Findings: Of the nine hypotheses tested, the first eight had to do with knowledge increase. Of these eight, numbers one, two, three, four, five, six, and eight were rejected. The rejection of these hypotheses indicates a significant knowledge increase in the overall area of alcohol and alcohol abuse. The acceptance of hypothesis seven indicates that in the specific area of alcohol and public safety, classroom instruction did not produce a significant knowledge increase. Hypothesis nine was concerned with attitude change. The change was quite small, and since it was not large enough to be significant, hypothesis nine was accepted
Society Notes and Announcements. Seventh District (N. Y.) Dental Society
No full textEditors: Aug. 1859-July 1865, J. D. White, J. H. McQuillen, G. J. Ziegler.--Aug. 1865-Dec. 1871, J. H. McQuillen, G. J. Ziegler.--Jan. 1872-May 1891, J. W. White.--July 1891-Apr. 1930, E. C. Kirk (with L. P. Anthony, Dec. 1917-Apr. 1930).--May 1930-Dec. 1936, L. P. Anthony.Vols. 1-13 are called "new series."Merged in Jan. 1937 with: Journal of the American Dental Association, ISSN 1048-6364, to form: Journal of the American Dental Association and dental cosmos, ISSN 0375-8451
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