Search results for "monitor"
showing 10 items of 3841 documents
Analytical Method for Quantification of Several Phthalate Acid Esters by Gas Chromatography-Mass Spectrometry in Coffee Brew Samples
2022
Several phthalate acid esters (PAEs), often called phthalate esters or phthalates, are substances classified as harmful due to their carcinogenic and mutagenic properties, and moreover, as dangerous for humans because they interfere with the endocrine system. In general, phthalic esters are used as plasticizers for different polymers and more other consumer products. In the present study, we describe a simple method to quantify PAEs in coffee brew using a liquid-liquid extraction without purification processes through analysing the obtained organic phase by GCMS in the single ion monitoring mode. The totals of single PAEs, in coffee brew samples analysed by us, are in the range of 159-5305 …
Environmental Aspect Concerning Phthalates Contamination: Analytical Approaches and Assessment of Biomonitoring in the Aquatic Environment
2023
This review is a survey of recent progress in studies concerning the impact of phthalic acid esters in aquatic organisms. After introducing the classification, properties, sources, fate, and toxic effects related to phthalates, an overview of the techniques of extraction and analysis of these substances is provided. As a result, the general concepts of environmental bioindicators, biomonitoring systems, and other concepts related to phthalate contamination in the aquatic environment are presented. Recent bioaccumulation data of different phthalates are summarised in a table and organised according to the type of organism, tissue, and geographical area of sampling. Bioindicator organisms tha…
BEM analysis of a piezoelectric structural health monitoring system for delamination detection
2013
In the present work a piezoelectric based structural health monitoring (SHM) system is analyzed with the aim of assessing the ability of the piezoelectric patch to detect both edge and embedded delaminations proper of flange-skin composite laminated structures. he boundary element model is developed for piezoelectric solids and is implemented by taking advantage of the multidomain technique to model laminated and cracked configurations. A non-linear spring model interface is then implemented in conjunction with an iterative procedure allowing for the simulation of the finite stiffness of the bonding layers as well as of the non-penetration condition of the delamination surfaces. he dynamic …
On the use of the EMI for the health monitoring of bonded elements
2014
The low weight, robustness and fatigue resistance of adhesive joints make them suitable for structural joints. A fully developed nondestructive evaluation technique however is needed to monitor and assess the quality of bonded joints. In the present paper the application of the electromechanical impedance (EMI) technique is proposed. In the EMI method a piezoelectric transducer (PZT) is attached to the structure of interest. The high sensitivity and low power consumption make the EMI method feasible for real time structural health monitoring. In this study we investigated the sensitivity of the electromechanical response of a PZT to the curing and the quality of the adhesive used for bonded…
Pilsētu izplešanās ietekmes novērtēšana un priekšlikumi adaptīvai urbānai attīstības plānošanai
2020
Nekontrolēta pilsētu izplešanās un nekoordinēta apdzīvojuma struktūras attīstība rada ekonomiskas, sociālas, sabiedrības veselības un vides kvalitātes ietekmes. Ietekmes var izteikt kā publiskā sektora un mājsaimniecības izmaksu slogu, ko būtu iespējams samazināt īstenojot autores izstrādāto adaptīvas urbānās attīstības plānošanas pieeju vai citas pilsētu izplešanās attīstības plānošanas pieejas.. Maģistra darba ietvaros tiek demonstrēts pilsētu izplešanās ietekmes novērtēšanas pieejas potenciāls, un sniegti priekšlikumi adaptīvas attīstības plānošanai, lai veicinātu datos balstītu lēmumu pieņemšanu, teritorijas pārvaldības un plānošanas spēju pielāgoties mūsdienu strauji mainīgajiem apstāk…
Montesori pirmsskolas izglītības iestādes kvalitātes nodrošināšanas sistēma
2021
Maģistra darba tēma ir «Montesori pirmsskolas izglītības iestādes kvalitātes nodrošināšanas sistēma». Maģistra darba apjoms: 64 lpp., ietverti 26 attēli, 5 tabulas, 7 pielikumi, izmantotas 90 literatūras avoti. Maģistra darba mērķis ir veikt pētījumu, lai izstrādātu Montesori pirmsskolas kvalitātes kritērijus un kvalitātes nodrošināšanas sistēmu, ievērojot valsts prasības un alternatīvās izglītības modeļa specifiku. Maģistra darbā uzmanība tiek pievērsta izglītības kvalitātes evolūcijai, tās nozīmi agrīnā bērnībā un Latvijas monitoringa sistēmas analīzi agrīnas bērnības izglītības vadības koncepta ietvaros. Pārskats par Eiropas un Latvijas kvalitātes stratēģijām agrīnā bērnībā un aprūpē ir …
Propuesta de monitorización integral de la calidad ambiental del interior de la Iglesia de los Santos Juanes de Valencia
2020
Para la correcta conservación de los bienes de interés cultural (BIC), debe existir una óptima calidad ambiental interior. La monitorización de esta calidad ambiental, tradicionalmente, incluye el estudio de la humedad y la temperatura de los espacios interiores ya que es bien conocido que sus valores elevados y fluctuaciones rápidas pueden alterar los materiales constitutivos de las obras de arte. Sin embargo, hay muchos otros parámetros que se deben estudiar para tener una visión completa de los riesgos potenciales relacionados con ambientes patrimoniales. En este trabajo, planteamos la importancia de una monitorización integral sistemática de la calidad ambiental de un bien patrimonial q…
Hydrogeologinen WSN-ympäristömonitorointi : tapaustutkimus Kaitforsin patoalueen pohjavesien korkeusseurannan pilottijärjestelmästä
2017
Tämän pro gradu -tutkielman tavoitteena on selvittää Kaitforsin patoalueelle toteutetun pohjavesien monitorointiin Kokkolan yliopistokeskus Chydeniuksessa kehitetyn pilottijärjestelmän näkökulmasta, millaisin menetelmin vedenkorkeuksien ja veden laadun monitorointia voidaan IoT:n ja langattomien sensoriverkkojen asettamista lähtökohdista automatisoidusti suorittaa. Tämän lisäksi tutkimuksen tavoitteena on selvittää automatisoidun ympäristömonitoroinnin nykytilaa ja siihen kytkeytyviä kehityssuuntauksia. Tutkimuksessa perehdytään myös Kaitforsin patoalueelle asennetun pilottijärjestelmän IEEE 802.15.4 -standardiin perustuvaan langattoman sensoriverkon toimintaan ja siihen kytkeytyneiden sens…
Analysis of FBG reflection spectra under uniform and non-uniform transverse loads
2019
Loads applied transversely on the external surface of waveguides change their circular cross-sectional geometry generating birefringence. Due to this effect the reflected spectrum of a Fibre Bragg grating (FBG) undergoes a splitting of the single peak of the Bragg wavelength. In this work, we employed the Transfer Matrix Method (TMM) for x- and y-polarized wave-modes to model the uniform FBG reflection spectra for uniform and non-uniform transverse loads. We also performed experimental measurements for two different transverse load scenarios. The load profiles chosen for these experiments were applied on the FBG sensor through a block of steel and a roll bearing pin. Then, the modelled and …
Public-service provision in clientelist political settlements: Lessons from Ghana's urban water sector
2015
The politics of public-service delivery continues to be neglected under the supposedly more context-sensitive post-Washington Consensus. Using interviews and documentary evidence from Ghana, this article provides an account of the networks of political interference and informal practices in Ghana's public water utility. It argues that, in order to understand why private-sector participation succeeds or fails and why similar arrangements have different outcomes across developing countries, we need to examine the effects of the informal institutional context, particularly the country-specific political settlement in which public-service provision operates.