Search results for "note"
showing 10 items of 10709 documents
High-Sensitivity Whispering Gallery Mode Humidity Sensor Based on Glycerol Microdroplet Volumetric Expansion
2021
We demonstrate a highly sensitive whispering gallery mode (WGM) relative humidity (RH) sensor based on a glycerol microdroplet. WGMs were excited using a 760 nm tunable semiconductor laser. We used free space coupling, which is effective when using a liquid resonator. A detailed analysis of different parameters influencing the sensor’s characteristics (sensitivity, hysteresis, resolution, stability, and temperature) is presented. The sensitivity of the sensor is one of the highest reported (2.85 nm/% RH in the range 50–70% RH with the resolution 1 × 10−4% RH). This type of humidity sensor has several advantages, such as high sensitivity, extended lifetime, good repeatability, and low cost, …
Patterning of supported gold monolayers via chemical lift-off lithography
2017
The supported monolayer of Au that accompanies alkanethiolate molecules removed by polymer stamps during chemical lift-off lithography is a scarcely studied hybrid material. We show that these Au–alkanethiolate layers on poly(dimethylsiloxane) (PDMS) are transparent, functional, hybrid interfaces that can be patterned over nanometer, micrometer, and millimeter length scales. Unlike other ultrathin Au films and nanoparticles, lifted-off Au–alkanethiolate thin films lack a measurable optical signature. We therefore devised fabrication, characterization, and simulation strategies by which to interrogate the nanoscale structure, chemical functionality, stoichiometry, and spectral signature of t…
Prompt Determination of the Mechanical Properties of Industrial Polypropylene Sandwich Pipes
2021
A simple and prompt method to determine the mechanical properties of industrial multilayer extrusion polypropylene pipes for a gravity sewer network is suggested. The engineering formulas included for calculating the permissible thickness and relative position of a foam core in the pipes are based on a linear-elastic approximation and the rule of mixtures. The applicability of the approximation was justified experimentally during investigation of the effective tensile characteristics of single- and multilayer pipes and each layer specimen by using traditional tests and finite-element calculations. The results obtained were used to formulate engineering recommendations for calculations of th…
Nanofilm Low Cost Oxygen Sensors
2009
Abstract The resitivity change of ultra thin metals under air exposure is used for vacuum or inert gas packaging control. In order to reach low cost, single use applications, few nm thin Aluminum layers were deposited on PET substrates and combined with wireless electronic readout circuitry. The sensor respose is characterized by resistance changes and explained in terms of multiphase diffusion mechanisms which are very sensitive to technological parameters.
Synthesis of nanostructured protein–mineral-microcapsules by sonication
2022
We propose a simple and eco-friendly method for the formation of composite protein–mineral-microcapsules induced by ultrasound treatment. Protein- and nanoparticle-stabilized oil-in-water (O/W) emulsions loaded with different oils are prepared using high-intensity ultrasound. The formation of thin composite mineral proteinaceous shells is realized with various types of nanoparticles, which are pre-modified with Bovine Serum Albumin (BSA) and subsequently characterized by EDX, TGA, zeta potential measurements and Raman spectroscopy. Cryo-SEM and EDX mapping visualizations show the homogeneous distribution of the densely packed nanoparticles in the capsule shell. In contrast to the results re…
Observation of the Early Structural Changes Leading to the Formation of Protein Superstructures.
2014
Formation of superstructures in protein aggregation processes has been indicated as a general pathway for several proteins, possibly playing a role in human pathologies. There is a severe lack of knowledge on the origin of such species in terms of both mechanisms of formation and structural features. We use equine lysozyme as a model protein, and by combining spectroscopic techniques and microscopy with X-ray fiber diffraction and ab initio modeling of Small Angle X-ray Scattering data, we isolate the partially unfolded state from which one of these superstructures (i.e., particulate) originates. We reveal the low-resolution structure of the unfolded state and its mechanism of formation, hi…
A new forum for upconversion research: The UPCON conference
2019
International audience; The Conference and Spring School on Properties, Design and Applications of Upconversion Nanomaterials (UPCON) provides a new forum for all experts and newcomers in the field of upconversion research. On the occasion of the second UPCON 2018 in Valencia (Spain), we are pleased to present a collection of 12 reviews and research articles that reflect recent advances in upconversion materials, their unique luminescent properties and many applications spanning from nanoscale thermometry to biomedicine.
Dual Enzyme-Triggered Controlled Release on Capped Nanometric Silica Mesoporous Supports
2012
The development of nanoscopic hybrid materials equipped with “molecular gates” showing the ability of releasing target entrapped guests upon the application of an external trigger has attracted great attention and has been extensively explored during recent years.1 These nanodevices are composed of two subunits, namely, a suitable support and certain capping entities grafted on the surface of the scaffolding.2 The support is used as a suitable reservoir in which certain chemicals can be stored whereas the molecules grafted in the outer surface act as a “gate” and can control the release of the entrapped molecules at will. Both components are carefully selected and arranged in order to achie…
Valsts teritorijas atdalīšanās kā tiesu uz pašnoteikšanos viens no tiesiskajiem realizēšanas veidiem
2016
Ņemot vērā to, ka mūsdienu starptautiskajās tiesībās tautu tiesības uz pašnoteikšanos aizvien nav noregulētas pietiekoši skaidri un pastāv ļoti plaša viedokļu dažādība par to, kādos apstākļos tiesības uz pašnoteikšanos var tikt izmantotas, ir nozīmīgi analizēt šos jautājumus konstruktīvā un secīgā manierē. Atsaucoties uz iepriekš minēto, kā arī uz vienu no tiesību uz pašnoteikšanos īstenošanas veidiem, proti, valsts teritorijas atdalīšanos no jau pastāvošas valsts, kas beidzamajā laikā ir kļuvis īpaši aktuāls tieši dēļ notikumiem Krimā, autors pētījuma ietvaros pievērsīsies šo sarežģīto jautājumu risināšanai. Pētījuma rezultātā autors noteiks tiesību uz pašnoteikšanos dažādo dimensiju piemē…
Kriminālsods par ceļu satiksmes noteikumu un transportlīdzekļu ekspluatācijas noteikumu pārkāpšanu
2017
Bakalaura darba tēma ir „Kriminālsods pret ceļu satiksmes noteikumu un transportlīdzekļu ekspluatācijas noteikumu pārkāpšanu.” Darba ietvaros tiek pētītas un analizētas problēmas, kas saistītas ar noziedzīga nodarījuma kvalificēšanu krimināllikuma 260. panta ietvaros pret ceļu satiksmes noteikumu un transportlīdzekļu ekspluatācijas noteikumu pārkāpšanu. Darbā sīkāk tiek pētīta kriminālsodu piemērošanas prakse krimināllikuma 260. panta ietvaros, analizējot tiesas motivāciju un mērķus ar kādiem tiek pamatota attiecīgā kriminālsoda piemērošana. Kvalificējot noziedzīgu nodarījumu pēc krimināllikuma 260. panta problēmjautājumi ir vainas formas noteikšanā vai noziedzīgs nodarījums atzīstams par i…