scholarly journals Electronic nose – an instrument for odour nuisances monitoring

2019 ◽  
Vol 100 ◽  
pp. 00079 ◽  
Author(s):  
Bartosz Szulczyński ◽  
Jacek Gębicki
Keyword(s):  
Electronic Nose ◽  
Complex Mixture ◽  
Point Of View ◽  
Masking Effect ◽  
Component Mixture ◽  
Electronic Noses ◽  
On Line ◽  
High Concentrations ◽  
Mixture Samples ◽  
Human Sense

An increasingly frequent problem of people living in urban agglomerations is the occurrence of odour nuisance. Although the source of these nuisances is different, their common feature is that they are a complex mixture of odour compounds with different odour thresholds. However, from a practical point of view, the most valuable would be a direct link between the odour intensity and the results of on-line analytical air monitoring. Such a possibility is created by the use of electronic noses (devices that are supposed to imitate the human sense of smell) to measure odours. The paper presents the use of an electronic nose combined with multiple liear regression model (MLR) to determine the odour intensity of the two-component mixture samples of commonly known odour compounds: trimethylamine (TMA) and triethylamine (TEA) in concentration range 50–200 ppm v/v. The obtained results were compared with the theoretical values determined using Zwaardemaker and euclidean additivity (EA) models. For high concentrations of substances in the mixtures (> 150 ppm v/v), the masking effect was observed.

scholarly journals Recording the Fragrance of 15 Types of Medicinal Herbs and Comparing Them by Similarity Using the Electronic Nose FF-2A

Chemosensors ◽  
2022 ◽  
Vol 10 (1) ◽  
pp. 20
Author(s):  
Emi Tsuchitani ◽  
Mayumi Nomura ◽  
Miyuki Ota ◽  
Erika Osada ◽  
Nobutake Akiyama ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Electronic Nose ◽  
Human Body ◽  
Complex Mixture ◽  
Medicinal Herbs ◽  
Gas Chromatography Mass Spectrometry ◽  
Absolute Value ◽  
Reference Axis ◽  
Human Sense

Medical herbs have been recognized till now as having different constituents that act on the human body. However, the fragrance of herbs is a complex mixture of odors, which makes it difficult to qualify or quantify the scent objectively on the human sense of smell. In this study, aromas of 15 medicinal herbs were recorded using an electronic nose FF-2A, and their characteristics were compared with aroma samples of wine such as Le Nez du Vin, to determine which wine aromas are similar to each medicinal herb. Thereafter, the aromas of the 15 herbs were standardized to create a reference axis for the aroma of each herb, and the similarity of tea herbs to the reference axis was examined. Additionally, the results were compared with those obtained by gas chromatography-mass spectrometry (GC-MS). In FF-2A, the measured scent is recorded as an absolute value. We succeeded in calculating the similarity of the scents of other herbs with the axes of the scent of each herb by standardizing their scents and creating new axis data. Conversely, although GC-MS is able to identify the components and concentrations of fragrances, an electronic nose can analyze fragrances in a way that is uncommon with GC-MS, such as comparison of similarities between fragrances.

Classification of Ear, Nose, and Throat Bacteria Using a Neural-Network-Based Electronic Nose

MRS Bulletin ◽  
2004 ◽  
Vol 29 (10) ◽  
pp. 709-713 ◽  
Author(s):  
Ritaban Dutta ◽  
Julian W. Gardner ◽  
Evor L. Hines
Keyword(s):  
Feature Extraction ◽  
Electronic Nose ◽  
Clustering Algorithms ◽  
Complex Mixture ◽  
Complex Data ◽  
Electronic Noses ◽  
Combined Use ◽  
Precise Diagnosis ◽  
Nose And Throat

AbstractThis article describes the use of an electronic nose (the Cyranose 320) to sense and identify three species of bacteria responsible for ear, nose, and throat (ENT) infections. Gathered data were a complex mixture of different chemical compounds. An innovative approach for classifying the bacteria data was investigated by using a combination of several clustering algorithms. The best results suggest that the three classes of bacteria examined can be predicted with up to 98% accuracy, allowing more precise diagnosis of ENT infection in patients. This type of bacteria data analysis and feature extraction is difficult, but it can be concluded that combined use of the analysis methods described here can solve the feature extraction problem with very complex data and enhance the performance of electronic noses.

scholarly journals Use of Electronic Noses for Diagnosis of Digestive and Respiratory Diseases through the Breath

Biosensors ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 35 ◽  
Author(s):  
Carlos Sánchez ◽  
J. Santos ◽  
Jesús Lozano
Keyword(s):  
Electronic Nose ◽  
Detrimental Effect ◽  
Point Of View ◽  
Diagnostic Methods ◽  
Electronic Noses ◽  
Medical Sector ◽  
Volatile Organic ◽  
Potential Applications ◽  
Electronic Nose Technology

The increased occurrence of chronic diseases related to lifestyle or environmental conditions may have a detrimental effect on long-term health if not diagnosed and controlled in time. For this reason, it is important to develop new noninvasive early diagnosis equipment that allows improvement of the current diagnostic methods. This, in turn, has led to an exponential development of technology applied to the medical sector, such as the electronic nose. In addition, the appearance of this type of technology has allowed the possibility of studying diseases from another point of view, such as through breath analysis. This paper presents a bibliographic review of past and recent studies, selecting those investigations in which a patient population was studied with electronic nose technology, in order to identify potential applications of this technology in the detection of respiratory and digestive diseases through the analysis of volatile organic compounds present in the breath.

Confidentiality of Statistical Records: A Threat-Monitoring Scheme for On Line Dialogue

1976 ◽  
Vol 15 (01) ◽  
pp. 36-42 ◽  
Author(s):  
J. Schlörer
Keyword(s):  
Statistical Data ◽  
Cost Benefit ◽  
Data Bank ◽  
High Ratio ◽  
Point Of View ◽  
Data Sets ◽  
Monitoring Scheme ◽  
Access Controls ◽  
On Line ◽  
Bona Fide

From a statistical data bank containing only anonymous records, the records sometimes may be identified and then retrieved, as personal records, by on line dialogue. The risk mainly applies to statistical data sets representing populations, or samples with a high ratio n/N. On the other hand, access controls are unsatisfactory as a general means of protection for statistical data banks, which should be open to large user communities. A threat monitoring scheme is proposed, which will largely block the techniques for retrieval of complete records. If combined with additional measures (e.g., slight modifications of output), it may be expected to render, from a cost-benefit point of view, intrusion attempts by dialogue valueless, if not absolutely impossible. The bona fide user has to pay by some loss of information, but considerable flexibility in evaluation is retained. The proposal of controlled classification included in the scheme may also be useful for off line dialogue systems.

scholarly journals New system of employment forecasting in Poland

2014 ◽  
Vol 15 (2) ◽  
pp. 75-90
Author(s):  
Łukasz Arendt
Keyword(s):  
Labour Market ◽  
Econometric Models ◽  
Point Of View ◽  
Labour Market Policy ◽  
Market Policy ◽  
On Line ◽  
New System

Abstract The goal of the paper was to describe the system of employment forecasting in Poland and to present forecasts results. The paper described the main assumptions and elements of the system of employment forecasting (the structure of econometric models and on-line forecasting tool). It also elaborated on employment forecasts at national, regional and occupational levels. The analysis of forecasts enabled drawing some conclusions, important from the point of view of the perspectives of the Polish labour market and the labour market policy.

scholarly journals Electronic nose based on nanoweights, expectation and reality

2017 ◽  
Vol 89 (10) ◽  
pp. 1587-1601 ◽  
Author(s):  
Tatyana Anatolievna Kuchmenko
Keyword(s):  
Electronic Nose ◽  
Raw Materials ◽  
Visual Image ◽  
Quantitative Information ◽  
Volatile Components ◽  
Integral Image ◽  
Standard Samples ◽  
Wine Quality ◽  
Electronic Noses ◽  
Complicated Task

AbstractOne of the topical approaches in analysis – outside the framework of traditional ones – is the formation of an integral “image” of the object. There are several approaches to solving the issue of obtaining as much information about the sample by a certain portion of its properties or its composition as possible. The first approach is forming a visual image (diagram) of several different properties of the analyzed sample, for example, the content of certain metals, acids, volatile components and some other indicators of wine quality. The consolidated image of a sample enables us to distinguish samples identical or similar in the selected properties from crucially different ones, even in case of an acceptable change of each indicator. Or else, using the consolidated image one can evaluate the direction of an image shift of a certain sample compared to the set of standard samples. The analysis of the geometry of the sample image by diverse indicators affords ground for assumption of the reasons for this deviation, as well as identification of falsification, or even solution of a more complicated task: detecting the area of growth of raw materials. The second approach is close to the first one in terms of methodology, but it digitizes properties using detectors and presents this as an image (“visual print” of response) of signals of these detectors on some components of the sample (presence, content). The feature of this approach is the use of a detector system that is non-selective and cross-sensitive to certain sample components. These sample images are produced using a system of “electronic nose”. “Visual prints” of array signals of different character sensors contain qualitative and quantitative information about the part of the analyzed sample which is sorbed by sensors. Despite the uncertainty of this information, “electronic noses” of piezoelectric type are widely used in the analysis of samples with complex varying composition.

scholarly journals Monitoring of Grid Scientific Workflows

2008 ◽  
Vol 16 (2-3) ◽  
pp. 205-216
Author(s):  
Bartosz Balis ◽  
Marian Bubak ◽  
Bartłomiej Łabno
Keyword(s):  
Real Life ◽  
Scientific Workflow ◽  
Point Of View ◽  
Scientific Workflows ◽  
Monitoring Data ◽  
Monitoring Point ◽  
Loosely Coupled ◽  
Provenance Data ◽  
On Line ◽  
Monitoring Architecture

Scientific workflows are a means of conducting in silico experiments in modern computing infrastructures for e-Science, often built on top of Grids. Monitoring of Grid scientific workflows is essential not only for performance analysis but also to collect provenance data and gather feedback useful in future decisions, e.g., related to optimization of resource usage. In this paper, basic problems related to monitoring of Grid scientific workflows are discussed. Being highly distributed, loosely coupled in space and time, heterogeneous, and heavily using legacy codes, workflows are exceptionally challenging from the monitoring point of view. We propose a Grid monitoring architecture for scientific workflows. Monitoring data correlation problem is described and an algorithm for on-line distributed collection of monitoring data is proposed. We demonstrate a prototype implementation of the proposed workflow monitoring architecture, the GEMINI monitoring system, and its use for monitoring of a real-life scientific workflow.

Molecular interactions shaping the tetraspanin web

2017 ◽  
Vol 45 (3) ◽  
pp. 741-750 ◽  
Author(s):  
Sjoerd J. van Deventer ◽  
Vera-Marie E. Dunlock ◽  
Annemiek B. van Spriel
Keyword(s):  
Molecular Interactions ◽  
Intracellular Signaling ◽  
Spatial Organization ◽  
Complex Mixture ◽  
Point Of View ◽  
Intramolecular Interactions ◽  
Fundamental Understanding ◽  
High Degree ◽  
Partner Proteins ◽  
Insight Into

To facilitate the myriad of different (signaling) processes that take place at the plasma membrane, cells depend on a high degree of membrane protein organization. Important mediators of this organization are tetraspanin proteins. Tetraspanins interact laterally among themselves and with partner proteins to control the spatial organization of membrane proteins in large networks called the tetraspanin web. The molecular interactions underlying the formation of the tetraspanin web were hitherto mainly described based on their resistance to different detergents, a classification which does not necessarily correlate with functionality in the living cell. To look at these interactions from a more physiological point of view, this review discusses tetraspanin interactions based on their function in the tetraspanin web: (1) intramolecular interactions supporting tetraspanin structure, (2) tetraspanin–tetraspanin interactions supporting web formation, (3) tetraspanin–partner interactions adding functional partners to the web and (4) cytosolic tetraspanin interactions regulating intracellular signaling. The recent publication of the first full-length tetraspanin crystal structure sheds new light on both the intra- and intermolecular tetraspanin interactions that shape the tetraspanin web. Furthermore, recent molecular dynamic modeling studies indicate that the binding strength between tetraspanins and between tetraspanins and their partners is the complex sum of both promiscuous and specific interactions. A deeper insight into this complex mixture of interactions is essential to our fundamental understanding of the tetraspanin web and its dynamics which constitute a basic building block of the cell surface.

It's YOUR Point of View…on Social Media

2010 ◽  
Vol 18 (4) ◽  
pp. 44-46
Author(s):  
Barbara Foster
Keyword(s):  
Social Media ◽  
New Technology ◽  
Point Of View ◽  
Emerging Trends ◽  
On Line ◽  
Trade Shows

For 20 years, Microscopy/Microscopy Education (MME) has been conducting market surveys for the industry, identifying emerging trends and, even more importantly, giving you, the practicing microscopist and spectroscopist, a chance to impact the direction of instrumentation via your input on our surveys. (Many of you remember us for the M&Ms we used to hand out in exchange for your input at key trade shows). The results of 20 years of your valued participation have been profound: new technology that fits your needs, coming on line faster and more economically.

Information Systems Outsourcing

2010 ◽  
pp. 412-427
Author(s):  
Ana André ◽  
Fernanda Sampaio
Keyword(s):  
Information Systems ◽  
Delphi Study ◽  
Service Providers ◽  
Point Of View ◽  
Common View ◽  
Risks And Benefits ◽  
Strategic Option ◽  
On Line ◽  
Great Relevance ◽  
Is Outsourcing

Information Systems (IS) Outsourcing has emerged as a strategic option to be considered and has been increasingly adopted by managers. However, many contracts still fail during their initial years, meaning that Outsourcing has also been subject to strong criticism. There are advantages to Outsourcing but also significant risks associated to it, and the assessment of both is therefore of great relevance for informed decision-making. The objective of this chapter is to determine to what extent a common view about risks and benefits associated to IS Outsourcing is shared by the Portuguese market players: Service Providers, Clients and Opinion Makers. In order to accomplish this, an on-line Delphi study was conducted, combined with the Q-sort technique, which allowed to obtain the perspective of each player on the risks and benefits IS Outsourcing. Comparing these perspectives it was possible to understand that the market players don’t share the same point of view.

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