Experimental detection

Xem 1-20 trên 116 kết quả Experimental detection
  • In a literature review of DRESCHER-KADEN et al. (1992) including 900 papers published since 1977, residue data about the level of organic pollutants in German sewage sludges were collected. 332 organic compounds with known or suspected toxic effects have been detected in sewage sludges, 42 of them regularly, most of them within the range of g/kg to mg/kg dry matter. Except volatile and easily degradable chemicals, the residue level increases from raw to digested sludge.

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  • A small part of the absorbed light energy in the photosynthesis process is lost during the migration from the pigment antenna to the reaction centers and are dissipated by a number of non-photochemical processes, including heat, and re-emission of a small but easily detectable amount (2-5% in vivo) of the absorbed radiation. This re-emission occurs at longer wavelengths in the red and far-red spectral regions and is termed as Chlorophyll Fluorescence (ChlF) (Shreiber, 1983; Backer & Bradbury, 1981)....

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  • Bronchiolitis. Bronchiolitis occurs predominantly in the first year of life and with decreasing frequency in the second and third years. The clinical features are rapid breathing and lower chest wall indrawing, fever in one-third of cases, and wheezing (Cherian and others 1990). Inflammatory obstruction of the small airways, which leads to hyperinflation of the lungs, and collapse of segments of the lung occur. Because the signs and symptoms are also characteristic of pneumonia, health workers may find differentiating between bronchiolitis and pneumonia difficult.

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  • Smear microscopy and culture forms the backbone of tuberculosis (TB) laboratory investigations in tertiary healthcare facilities which have a large number of cases and financial constraints. The present study aimed to re-evaluate the efficiency of smear microscopy and culture on Lowenstein Jensen (LJ) medium for acid fast bacilli (AFB) isolated from patients with pulmonary tuberculosis. 210 samples were processed for detection of AFB by Ziehl Neelsen (ZN) staining. Concentration method of N-acetly-L-cystein-NaOH was used and the samples were isolated on LJ medium. AFB was seen in 168 (80.

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  • This paper studies the problem of identifying erroneous/correct sentences. The problem has important applications, e.g., providing feedback for writers of English as a Second Language, controlling the quality of parallel bilingual sentences mined from the Web, and evaluating machine translation results. In this paper, we propose a new approach to detecting erroneous sentences by integrating pattern discovery with supervised learning models. Experimental results show that our techniques are promising. ...

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  • This paper proposes a supervised learning method for detecting a semantic relation between a given pair of named entities, which may be located in different sentences. The method employs newly introduced contextual features based on centering theory as well as conventional syntactic and word-based features. These features are organized as a tree structure and are fed into a boosting-based classification algorithm. Experimental results show the proposed method outperformed prior methods, and increased precision and recall by 4.4% and 6.7%. ...

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  • Link detection has been regarded as a core technology for the Topic Detection and Tracking tasks of new event detection. In this paper we formulate story link detection and new event detection as information retrieval task and hypothesize on the impact of precision and recall on both systems. Motivated by these arguments, we introduce a number of new performance enhancing techniques including part of speech tagging, new similarity measures and expanded stop lists. Experimental results validate our hypothesis. ...

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  • This paper presents a solution to find Hot-IPs by using non-adaptive group testing approach. The proposed solution has been implemented in combination with the distributed architecture and parallel processing techniques to quickly detect HotIPs in ISP networks. Experimental results can be applied to detect Hot-IPs in ISP networks.

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  • The findings show that spider-net like ZnO nanofibers with a diameter of 60 – 100 nm were successfully synthesized without any incorporation of impurities into the nanofibers. The FESEM images also reveal that each nanofiber is composed of many nanograins. The combination of experimental and calculated X-ray diffraction data indicate that ZnO nanofibers were crystallized in hexagonal wurtzite structure.

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  • This paper presents the results of an experimental study of three samples containing various elements in the near-surface layers. The depth profiles of all the elements of different atomic masses from hydrogen to silver were investigated by Rutherford Backscattering Spectrometry (RBS) and Elastic Recoil Detection Analysis (ERDA). The experiments were performed by using the low-energy (about 2 MeV) 4He+ ion beams.

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  • In this work, we suggest simple setups, which resort to neither any extra quantum resources nor controlled-Hadamard gates, to observe such superpositions as well as entanglement-separability superpositions with tunable entanglement degree. The suggested setups can also serve as an interaction-free method to detect partially absorbing objects.

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  • The synthesis, characteristics and applications of the rhodamine derivative-based fluorescent chemodosimeter RT for detection of mercury ions have been studied at the B3LYP/LanL2DZ level of theory. The calculated results confirmed the presence of spirolactam ring in RT molecule. The Hg(II) ions reacted with RT to form RG, accompanied by the formation of guanidine ring and the spirolactam ring-opening in RG, turning on the fluorescence of RG. These results were in a good agreement with experimental investigations.

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  • The term "biometrics" is derived from the Greek words bio means “life” and metric means “to measure”. In this paper, a detailed experimental study of physiology biometrics (face, iris) detection, face detection algorithms based on “Skin Color” has been made.

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  • Bacterial biofilms are regarded to be the primary aetiological factor in the initiation of gingival inflammation and subsequent destruction of periodontal tissues (Offenbacher 1996) and three major specific pathogens have been repeatedly identified as etiologic agents, namely Aggregatibacter (Actinobacillus) actinomycetemcomitans (Aa), Porphyromonas gingivalis (Pg) and Tannerella forsythia (Tf) (Socransky et al. 1998).

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  • This study uses what Cresswell (2003) refers to as a ‘mixed methods approach’, one that combines quantitative and qualitative data collection and a ‘sequential explanatory strategy’ in which the collection and analysis of the quantitative data is followed by the collection and analysis of the qualitative data (p 215).

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  • This book focuses on the basic electrochemical applications of DNA in various areas, from basic principles to the most recent discoveries. The book comprises theoretical and experimental analysis of various properties of nucleic acids, research methods, and some promising applications.

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  • A study to measure indoor concentrations and emission rates of volatile organic compounds (VOCs), including formaldehyde, was conducted in a new, unoccupied manufactured house installed at the National Institute of Standards and Technology (NIST) campus. The house was instrumented to continuously monitor indoor temperature and relative humidity, heating and air conditioning system operation, and outdoor weather. It also was equipped with an automated tracer gas injection and detection system to estimate air change rates every 2 h.

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  • Human-Robot Interaction (HRI) has been an important research area in last decade. When the robot has become increasingly more flexible, they were useful in a variety of robot and human applications are expected in teract very closely. Therefore becomes necessary to understand the nature human-computer interaction to information tools and techniques can be developed to allows humans and robots to work together seamlessly, strong and natural. Research on human-machine interaction are diverse and include a variety of topics....

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  • High distribution uniformity and low application rate, at frequent irrigation cycles, provide maximum control and monitoring of the wetted and aerated soil profile, which is essential for the shallow root system of the lettuce. Low application rate (3-5 mm/h): allows optimal absorption of water into the soil with no run-off, even on slopes. Low droplet impact: preserves soil structure and prevents crust formation to allow perfect germination and development.

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  • The Terrorism Risk Insurance Extension Act of 2005 requires the President’s Working Group on Financial Markets (PWG) to perform an analysis regarding the long- term availability and affordability of insurance for terrorism risk, including group life coverage; and coverage for chemical, nuclear, biological, and radiological events; and to submit a report of its findings to Congress by September 30, 2006.

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