Search results for "Sensor"
showing 10 items of 4594 documents
A metal-responsive interdigitated bilayer for selective quantification of mercury( ii ) traces by surface plasmon resonance
2016
Reusable surface plasmon resonance chips allowing the quantitative and selective detection of mercury(II) ions in water at the 0.01 nM level are reported. The surface-modified gold sensor consists of a rarefied self-assembled monolayer of octanethiol topped with a Langmuir–Blodgett monolayer of an amphiphilic and highly-specific chelator. The interdigitated architecture confers to the bilayer a high packing density, surface coverage, and binding-group accessibility.
Datu noliktavas un datu ezera arhitektūras implementācija sensoru datiem
2021
Bakalaura darba mērķis ir datu noliktavas un datu ezera arhitektūras izpēte un realizācija priekš sensoru datu noglabāšanas. Sensoru datu apjoms strauji pieaug, kā arī pieaug vajadzība šos datus noglabāt tā, lai tie būtu izmantojami arī pēc ilgākiem laika periodiem priekš ilgtermiņa analizēšanas vai citiem nodomiem. Tiek apskatīta un izvēlēta viena no vairākām šāda veida arhitektūrām. Balstoties uz arhitektūras apraksta, tiek izpētīti un aprakstīti vajadzīgie rīki, kas ir vajadzīgi priekš šādas arhitektūras realizācijas. Sekojoši arhitektūra tiek daļēji realizēta. Ir izveidots datu ezers un sagatavoti rīki, lai varētu veidot datu noliktavu. Izveidotajā datu ezerā veiksmīgi ielādēti dati no …
De la perception sensorielle à la consommation du vin. Partie 1/2 : Mécanisme de la perception sensorielle : reflet de la réalité
2010
National audience; Afin de percevoir son environnement et de pouvoir réagir en conséquence, l’être humain est équipé de capteurs sensoriels. Ces capteurs constituent une interface entre le sujet et le monde extérieur et quelle que soit la stimulation extérieure, ils mettent en jeu les mêmes mécanismes sensoriels. Lorsque les capteurs sensoriels rentrent en contact avec un stimulus, les informations engendrées sont amplifiées, puis transmises au système nerveux central sous forme de signaux électriques (Mac Leod et Sauvageot, 1986) après avoir été progressivement filtrées, réduites et stabilisées. Ces informations électriques sont caractérisées d’une part par une masse globale d’activité, co…
Synergistic enhancement via plasmonic nanoplate-bacteria-nanorod supercrystals for highly efficient SERS sensing of food-borne bacteria
2017
Bio-sensing techniques utilizing metallic nanoparticles as a probe have gained more and more attention and play today an important role in the detection of bacteria. To date, although several sensing materials have been tested, there is still a long way to go to achieve a fast, low-cost, ultrasensitive and multifunctional substrate suitable for a universal biosensor for detection of bacterial cells. Here, we report a novel probe design based on anisotropic plasmonic nanoparticles organized to a biocompatible 3D bio-inorganic scaffold, i.e., nanoplate-bacteria-nanorod supercrystals (NBNS) with extremely high surface-enhanced Raman spectroscopic (SERS) activity as a model of synergistic plasm…
Sensoru, datu uzkrājēju un interaktīvās tāfeles lietojums fizikas mācību procesā
2013
Elektroniskā versija nesatur pielikumus
Spectral calibration of hyperspectral imagery using atmospheric absorption features
2006
One of the initial steps in the preprocessing of remote sensing data is the atmospheric correction of the at-sensor radiance images, i.e., radiances recorded at the sensor aperture. Apart from the accuracy in the estimation of the concentrations of the main atmospheric species, the retrieved surface reflectance is also influenced by the spectral calibration of the sensor, especially in those wavelengths mostly affected by gaseous absorptions. In particular, errors in the surface reflectance appear when a systematic shift in the nominal channel positions occurs. A method to assess the spectral calibration of hyperspectral imaging spectrometers from the acquired imagery is presented in this p…
Changes in surface stress, morphology and chemical composition of silica and silicon nitride surfaces during the etching by gaseous HF acid
2007
International audience; HF acid attack of SiO2 and Si3N4 substrates is analyzed to improve the sensitivity of a sensor based on inicrocantilever. Ex situ analysis of the etching using XPS, SIMS and AFM show significant changes in the anisotropy and the rate of the etching of the oxides on SiO2 and Si3N4 surface. Those differences influence the kinetic evolution of the plastic bending deflection of the cantilever coated with SiO2 and Si3N4 layer, respectively. The linear dependence between the HF concentration and the Si3N4 cantilever bending corresponds to a deep attack of the layer whereas the nonlinear behavior observed for SiO2 layer can be explained by a combination of deep and lateral …
2-3 gadus vecu bērnu sensoro spēju attīstība pirmsskolā
2017
Pedagoģiskajā procesā, strādājot ar 2-3 gadus veciem bērniem, novērots, ka bērnu interese un uzmanība ir vērsta uz daudzveidīgo priekšmetu vai objektu izpēti, raksturojumu un pielietojumu praktiskā darbībā, kas ir cieši saistīts ar vecumposma īpatnībām. Bērnu izziņas interese par priekšmetu krāsu, formu un lielumu sekmē sensoro spēju attīstību. Lai to aktīvi izmantotu, ir nepieciešama katra bērna spēju izpēte un novērtēšana. Sensoro spēju attīstībai ir jāpievērš liela uzmanība pedagoģiskajā procesā, jo šo spēju attīstība ietekmē bērnu domāšanu, uztveri, atmiņu un psihiskās izziņas procesus. Diplomdarba tēma: 2-3 gadus vecu bērnu sensoro spēju attīstība pirmsskolā. Darbs sastāv no 62 lpp, 3 …
Preattentive detection of rare audiovisual feature conjunctions by the human brain as reflected by the mismatch negativity
2007
Event-Related Potentials to Changes in Sound Intensity Demonstrate Alterations in Brain Function Related to Depression and Aging
2020
Measures of the brain’s automatic electrophysiological responses to sounds represent a potential tool for identifying age- and depression-related neural markers. However, these markers have rarely been studied related to aging and depression within one study. Here, we investigated auditory event-related potentials (ERPs) in the brain that may show different alterations related to aging and depression. We used an oddball condition employing changes in sound intensity to investigate: (i) sound intensity dependence; (ii) sensory gating; and (iii) change detection, all within a single paradigm. The ERPs of younger (18–40 years) and older (62–80 years) depressed female participants and age-match…