Analysis and Identification of Off-Odor Compounds in Electronic Systems

2006 ◽  
Author(s):  
Mary Ann Nailos ◽  
Dan Stein ◽  
Lawrence T. Nielsen ◽  
Anna Iwasinska
Keyword(s):  
Volatile Compounds ◽  
Electronic Systems ◽  
Detection Thresholds ◽  
Detection And Identification ◽  
Odor Compounds ◽  
Novel Method ◽  
Odor Analysis ◽  
Analytical System ◽  
Task Perception ◽  
Analytical Tools

Abstract The detection and identification of substances that give rise to aromas and off-odors is often a difficult task. Perception of odors is very subjective and odor detection thresholds vary from person to person. The identification of trace levels of compounds responsible for perceived odors is difficult using conventional analytical tools. This paper will focus on a novel method for sampling and analyzing aromatic volatile compounds using an analytical system specifically designed for odor analysis.

scholarly journals Minor Volatile Compounds in White Wines from Canary Islands, Madeira, and Pico (Azores) by Headspace Solid-Phase Microextraction-Gas Chromatography-Mass Spectrometry: A Qualitative Study

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
S. J. Pérez-Olivero ◽  
J. P. Pérez Trujillo ◽  
J. E. Conde
Keyword(s):  
Volatile Compounds ◽  
Canary Islands ◽  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Gas Chromatography Mass Spectrometry ◽  
White Wines ◽  
Headspace Solid Phase Microextraction ◽  
Detection And Identification ◽  
Analytical System

Application of headspace solid-phase microextraction (HS-SPME) coupled with high-resolution gas chromatographic (HRGC) analytical system was studied for detection and identification of volatile compounds in wines. Four different SPME fibers were tested, and 138 different compounds were detected and identified. The best fiber for the determination of different groups of compounds was selected. Using these results, a comparative study of Madeira, Tenerife (Canary Islands), and Pico (Azores) was carried out.

Near Field EMC Scanning Method Based on an E-Field Collapse

2015 ◽  
Author(s):  
Jeff Dunnihoo ◽  
Pasi Tamminen ◽  
Toni Viheriäkoski
Keyword(s):  
Near Field ◽  
Electronic Systems ◽  
Inexpensive Method ◽  
Scanning Method ◽  
Field Information ◽  
Novel Method ◽  
Near Field Scanning

Abstract In this study we present a novel method to use a field collapse method together with fully automated near field scanning equipment to construct E- and H-field information of a system during transient ESD events. This inexpensive method provides an alternative way for system designers to validate and analyze the EMC/ESD capability of electronic systems without TLP pulsers, ESD simulators, or precision inductive current probes.

scholarly journals DIGITALIZATION AS A DIRECTION OF TRANSFORMATION OF CRIMINAL PROCEEDINGS

2021 ◽  
pp. 96-102
Author(s):  
T. О. Pavlova
Keyword(s):  
Information And Communication Technologies ◽  
Personal Data ◽  
Communication Technologies ◽  
Cyber Attacks ◽  
Electronic Systems ◽  
Criminal Proceedings ◽  
Systematic Analysis ◽  
Information And Communication ◽  
Legislative Changes ◽  
Analytical System

The article is devoted to the study of the influence of the process of digitalization on the transformation of modern criminal proceedings, the functioning of the institution of justice in general. The introduction of electronic criminal proceedings in our country is due to the development of a modern electronic society and trends in the introduction of information and communication technologies in the world. Electronic criminal proceedings is a “smart” information and analytical system that digitizes paper documents, allows the exchange of files within the framework of criminal proceedings. It is proposed to carry out a detailed and systematic analysis of the provisions of the current national legislation in order to introduce the appropriate substantiated legislative changes and consolidate the concept, stages, and algorithm of the electronic criminal proceedings; the introduction of electronic criminal proceedings on the basis of the functioning of Unified Register of Pre-trial Inquiry. Electronic criminal proceedings are an inevitable phenomenon of the modern information world. For the quality of operation of electronic criminal proceedings, it is necessary to take into account the advantages and risks of the functioning of a “smart” system. The advantages of introducing electronic criminal proceedings include: saving money and time; reduction of terms for consideration of procedural documents; simplification of access of subjects of criminal proceedings within their competence to procedural materials; increasing the efficiency of the investigation of criminal proceedings and so on. The introduction of electronic criminal proceedings should take place quite deliberately, with the understanding that digital technologies will inevitably affect relationship between people and the formation of their thinking. We believe that digital intelligence is not capable to replace a specialist completely. The digitalization of criminal proceedings will entail certain risks and difficulties. It is necessary to protect the collected personal data, which will prevent the drafting of clone documents and the «leaking» of confidential information in connection with cyber-attacks. It is also necessary to protect the provision of necessary equipment for law enforcement officers and judges in the field; the need to integrate among themselves the working electronic systems of the pre-trial inquiry bodies and the court; training of personnel capable of working with digital computer technologies and so on.

scholarly journals Investigation of body secretions as bioindicators in cattle estrus detection

2020 ◽  
Vol 44 (5) ◽  
pp. 1070-1086
Author(s):  
Özgül ANİTAŞ ◽  
Serap GÖNCÜ
Keyword(s):  
Volatile Compounds ◽  
Accurate Determination ◽  
Body Fluids ◽  
Gas Chromatography Mass Spectrometry ◽  
Animal Reproduction ◽  
Artificial Nose ◽  
Odor Compounds ◽  
Cattle Reproduction ◽  
Volatile Chemical Compounds

The accurate determination of estrus has a fundamental role in cattle reproduction management. The determination of volatile chemical compounds (pheromones) secreted only during estrus in all body fluids can be used for determining accurate estrus time and artificial insemination time and have a potential role in technological animal reproduction control. In this study, Holstein cows were synchronized and their sudor, urine, feces, milk, saliva, vaginal secretions, and blood samples were taken in the preestrus, estrus, and postestrus periods and analyzed by gas chromatography-mass spectrometry for determination of volatile odor compounds. A total of 531 volatile compounds were detected in the preestrus period, 538 in the estrus period, and 494 in the postestrus period. Among these, 8 compounds were found to be common in all body fluids and the ratio of these compounds to those detected in all body fluids was 2.6%. Especially in the estrus, 3-methyl pentane, hexanal, 4-methylphenol (p-cresol), phenylacetaldehyde, 3-phenylpropiononitrile, 1 H-indole, cyclotetrasiloxane octamethyl and pentane 2-methyl were detected. Biotechnology devices such as artificial nose with sensors can be developed, recognizing estrus-specific volatile compounds detected from all body fluids only in estrus period.

scholarly journals Degradation of Preservatives with the Formation of Off-Odor Volatile Compounds—The Case of Strawberry-Flavored Bottled Water

Beverages ◽  
2020 ◽  
Vol 6 (4) ◽  
pp. 67
Author(s):  
Barbara Sokołowska ◽  
Marzena Połaska ◽  
Agnieszka Dekowska ◽  
Łukasz Woźniak ◽  
Marek Roszko
Keyword(s):  
Liquid Medium ◽  
Volatile Compounds ◽  
Sodium Benzoate ◽  
Sorbic Acid ◽  
Final Concentration ◽  
Bottled Water ◽  
Potassium Sorbate ◽  
Numerous Species ◽  
Flavored Water ◽  
Odor Compounds

Foods preserved with sorbic acid or its salts can undergo spoilage with the formation of chemicals characterized by odors of plastic, hydrocarbons, or kerosene. 1,3-pentadiene, which is formed through the decarboxylation of sorbic acid or its salts, is one such compound. Numerous species of molds and yeasts have been reported as capable of degrading sorbic acid. This work is aimed to identify the off-odor compounds in samples of strawberry-flavored water preserved with potassium sorbate and sodium benzoate. In addition, the mold isolated from this drink was evaluated for the ability to form undesirable compounds, and the results revealed the presence of 1,4-pentadiene and benzaldehyde in the tested samples. The mold isolated from the samples was identified as Penicillium corylophilum. During its 5-day incubation at 25 °C in a liquid medium, potassium sorbate added at a final concentration of 200 and 400 mg/L was completely assimilated by the growing mycelium and converted into 1,4-pentadiene. The concentration of the latter was determined as 46.5 and 92.6 mg/L, respectively. The decrease in the concentration of sodium benzoate exceeded 53% in the broth spiked at 200 mg/L and 23% at 400 mg/L, resulting in the formation of benzaldehyde.

scholarly journals Rhythmic auditory stimuli modulates movement recovery to perturbation during locomotion

2021 ◽  
pp. jeb.237073
Author(s):  
Deepak K. Ravi ◽  
Marc Bartholet ◽  
Andreas Skiadopoulos ◽  
Jenny A. Kent ◽  
Jordan Wickstrom ◽  
...  
Keyword(s):  
Recovery Time ◽  
Complex Dynamics ◽  
Center Of Mass ◽  
Intrinsic Property ◽  
Auditory Stimuli ◽  
Bipedal Locomotion ◽  
Comprehensive Understanding ◽  
Locomotor System ◽  
Novel Method ◽  
Analytical Tools

The capacity to recover after a perturbation is a well-known intrinsic property of physiological systems, including the locomotor system, and can be termed resilience. Despite an abundance of metrics proposed to measure the complex dynamics of bipedal locomotion, analytical tools for quantifying resilience are lacking. Here, we introduce a novel method to directly quantify resilience to perturbations during locomotion. We examine the extent to which synchronizing stepping with two different temporal structured auditory stimuli (periodic and 1/f structure) during walking modulates resilience to a large unexpected perturbation. Recovery time after perturbation was calculated from the horizontal velocity of body's center of mass. Our results indicate that synchronizing stepping with 1/f stimulus elicited greater resilience to mechanical perturbations during walking compared to the periodic stimulus (3.3 seconds faster). Our proposed method may help to gain a comprehensive understanding of movement recovery behavior of humans and other animals in their ecological contexts.

scholarly journals FRUIT ODOR COMPOUNDS INHIBIT POSTHARVEST FUNGAL DECAY OF STRAWBERRIES AND RASPBERRIES

HortScience ◽  
1992 ◽  
Vol 27 (6) ◽  
pp. 677a-677
Author(s):  
Steven F. Vaughn ◽  
Gayland F. Spencer
Keyword(s):  
Shelf Life ◽  
Volatile Compounds ◽  
Alternaria Alternata ◽  
Fungal Growth ◽  
Rhizopus Stolonifer ◽  
Fungal Decay ◽  
Fruit Odor ◽  
Odor Compounds ◽  
Fruit Damage ◽  
Low Levels

The shelf-life of strawberries and raspberries is limited primarily due to losses from fungal decay. During ripening, these fruits release numerous volatile compounds, some of which have been shown to have antifungal activities. We examined fifteen volatiles released by both fruits for the prevention of postharvest fungal decay. Benzaldehyde, 1-hexanol and 2-nonanone completely inhibited all fungal growth on fruit at gas headspace concentrations of 0.1 μl/ml, while causing little damage to the fruit. However, greater levels of these compounds, although completely inhibiting fungi, generally caused some fruit damage. Headspace concentrations of these compounds at 0.04 μl/ml or greater completely inhibited the growth of Botrytis cinerea and Alternaria alternata in culture but higher levels were required to inhibit Colletotrichum gloeosporoides and Rhizopus stolonifer. These results suggest that these compounds could be used to effectively prevent fungal decay if constant, low levels could be maintained in the headspace surrounding the fruit.

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