Magnetostatica yahoo dating

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FISICA Experience to date in Africa and elsewhere suggests that a number of factors are important for successful CLTS ( Box 3). Email: [email protected]; [email protected] [email protected] /qĐ-ttg dated nov. Fizic ă General ă -. curs magnetostatica. magnetostatica. studiaz ă c â. Introduccion a La Magnetostatica y Electrostatica. Baixar. Pular para a Instead of using the mean salary to describe how Yahoo pays its employees. Example: She created a plot of the dates of the pennies. 8. weighed each of.

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The browser made its public debut on May 23, The service was shut down in October along with other Yahoo services as part of the Microsoft and Yahoo search deal. The name SearchMonkey is an homage to Greasemonkey. Officially the product name has no space and two capital letters. At one point it was the third-most-browsed site on the World Wide Web. Yahoo Tech was a website that provided product information and setup advice to users.

Yahoo launched the website in May On March 11,Yahoo closed down the service and redirected users to Yahoo's technology news section. Yahoo Koprol was an Indonesian geo-tagging website that allowed users to share information about locations without the use of a GPS device. Koprol was acquired by Yahoo [] a year following its inception and, in1. However, eighty percent of users were Indonesian.

La iradierea materialelor cu fluente laser la limita pragului de ablatie apar pe suprafata acestora structuri periodice induse de radiatia optica polarizata liniar.

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Perioada structurilor este mult sub lungimea de unda nm a laserului Ti: In cazul pulsurilor laser in domeniul femtosecundelor, perioada acestora variaza de la cateva zeci pana la sute de nanometri, in functie de conditiile de iradiere si de natura de materialului. Filme metalice din nichel, crom, platina, titan, depuse pe substrat de siliciu si sticla, au fost procesate prin scanare cu fascicul laser pulsat la diferite energii pe puls si viteze de scanare.

La diferite conditii de iradiere s-au observat formarea a trei tipuri de structuri periodice: In cazul cromului s-a observat un al patrulea tip de nanostructuri, similar celor de tipul II, insa cu perioada de aproximativ de patru ori mai mica decat a celor de tip I. S-a constatat ca orientarea structurilor nu depinde de directia de scanare cu laserul a suprafetei, ci urmareste doar directia de polarizare a laserului. Din caracterizari SEM s-a determinat formarea unor fire metalice cu lungimi de ordinul micrometrilor si grosimi de zeci-sute de nm.

Masurari SEM "cross-section" au pus in evidenta adancimii ale structurilor periodice de pana la nm, comparabile cu grosimea filmelor metalice.

S-a mai determinat ca formarea acestora are loc in urma topirii si resolidificarii materialului si nu in urma ablatiei localizate, asa cum sugereaza teoriile interferentiale existente. Cristalele fotonice au proprietatea de a bloca transmisia radiatiei pentru anumite domenii de lungimi de unda, fapt care permite obtinerea de circuite de tip jonctiuni in Y cu unghi larg in cristale fotonice [].

Pentru imbunatatirea performantelor este nevoie de utilizarea unui material cu indice mare de refractie precum nitrura de siliciu. Au fost analizate structuri de cristal fotonic de tip hexagonal cu atomi circulari obtinuti prin corodarea stratului de nitrura de siliciu si cu ghiduri de unda obtinute prin indepartarea atomilor pe anumite portiuni.

A fost simulata propagarea radiatiei cu lungimea de unda de nm printr-un divizor de radiatie cu o intrare si doua iesiri care consta in jonctiunea in Y propriu-zisa si doua deviatii. Pentru scaderea nivelului de pierderi s-a luat in considerare racorduri la 30 de grade dintre ghidul de intrare si cele doua brate ale jonctiunii precum si intre bratele jonctiunii si ghidurile de iesire.

Simularea modului de propagare al radiatiei prin divizorul de radiatie a fost realizata cu ajutorul pachetului de simulare OptiFDTD. A fost utilizata o simulare tip 2D ca urmare a utilizarii metodei indicelui efectiv. Din rezultatele simularii s-a obtinut un divizor de putere care are o eficienta apropiata de cea ideala.

Din punct de vedere experimental s-a fabricat un cristal fotonic cu o jonctiune in Y prin scrierea cu fascicul de electroni a unui strat de PMMA. Structura obtinuta experimental probeaza fezabilitatea realizarii de circuite optice pe baza de cristale fotonice, utilizand litografia cu fasicul de electroni. Referinte bibliografice [1] Y. B 27, The platform comprises the magneto-plasmonic sensor, the surface plasmon resonance detection module, the electromagnet providing the oscillating magnetic field with controlled field strength and frequency with actuation role for MOSPR and the flow-through chamber with integrated microfluidics.

The physical transduction principle is based on the combination of the magneto-optic activity of magnetic materials and plasmonic properties of selected metallic layers. The actual structure of layers was optimized using a Transfer Matrix approach based on the magneto-optical activity of the trilayers as a function of the thickness and position of the Cr, Co and Au layers, and has been constructed in house via physical vapor deposition of thin layers of Cr, Au and Co.

Such combination can produce a significant enhancement of the SPR effects that strongly depends on the optical properties of the surrounding medium, allowing its use for biosensing applications2. Calibration curves based on solutions with different refractive indices show a steeper slope in the case of the magneto-optical sensor proving an increased sensitivity. The sensing avenues emphasizing analytical capabilities of the platform e.

Lucrari sectiunea oral Acknowledgment: Selected References [1] B. Armelles, Optics Letters, 31, 8 [2] D. Wolf, Principles of optics: Oxford; New York, B,— Metode moderne de analiza nedistructiva cu radiatii X: Sunt prezentate unele rezultate obtinute in metrologia nanotehnologiilor de producere a nanomaterialeleor carbonice grafene, oxizi de grafenaZnO, etc. Keith Bowen; Brian K. Budianu IMT- Bucharest TiO2 samples for solar cells applications were prepared by the electrochemical oxidation of pure titanium thin film deposited onto various substrate types including silicon, SiO2 and borosilicate glass.

Titanium layers of 90 nm thickness were deposited on substrate by DC magnetic sputtering. The influence of anodizing parameters on the surface morphology was investigated in detail to optimize the process in order to obtain the porous structure.

The best results have been obtained using fluorine-containing electrolyte. After anodization, samples were washed in distilled water, dried with nitrogen and treated at different temperature from to 0C for oxidation. Thickness dependence of TiO2 layers and pores geometry on the parameters of anodizing process was established from the SEM.

The formation process of the porous structure and the change in surface morphology induced by heat treatments is evident. The surface chemical compositional analyses of TiO2 anodization and annealing films were performed by Fourier transform infrared spectroscopy FTIR. The IR spectra of the sample of titanium metallic film deposited on silicon substrate, puts in evidence the native tendency of titanium to oxidize in air, demonstrated by the appearance a spectral bands in the region cm-1, bands can be attributed to Ti-O bonds.

Spectral band centered at cm-1 is characteristic mode of vibration of Ti-O-Ti bonding of anatase — phase. From the Raman spectra one can conclude that the titania undergo following structural transformation at each stage of annealing process. At sample treated at 0C, anatase phase becomes the major one proved by the bands at cm-1 and cm-1 of Eg Raman active mode in anatase crystal.

Lucrari sectiunea oral References 1. Yuan et al, J. Indian Academy Science, PV — 6, pp. Ignat, Eveline Popovici, V. Radulescu, Biblioteca Academiei Romane Lucrari sectiunea poster Baicea, Stefan Ioan Voicu, V. Studii de preparare, caracterizare si evaluare in vitro. Una din modalitatile de realizare a transportului transdermic al medicamentelor prin piele este utilizarea nanoveziculelor elastice. Lucrarea prezinta studiile experimentale de preparare si caracterizare a unor nanovezicule elastice, transferozomi si etozomi, cu drospirenona 1un hormon cu proprietati asemanatoare progesteronului, utilizat in terapia de substitutie hormonala si pentru contraceptiein vederea realizarii unui sistem transdermic.

S-a urmarit si influenta parametrilor de formulare asupra caracteristicilor nanoveziculelor: S-au preparat transferozomi prin metoda clasica a hidratarii filmului lipidic 2. Etozomii au fost preparati prin metoda descrisa de Touitou 3. Determinarea gradului de incorporare s-a efectuat prin determinarea cantitatii de drospirenona din 0,2 ml suspensie lipozomala, prin spectrofotometrie in UV si HPLC dupa prealabila separare a substantei neincorporate, prin centrifugarea la rpm, timp de 60 minute.

Distributia pe dimensiuni a nanoveziculelor s-a determinat cu apratul Mastersizer R, Malvern. Studiile de cedare in vitro s-au efectuat intr-o celula Franzt verticalamodificata, utilizand membrana de celofan standard. Experimentarile efectuate au demonstrat ca gradul de incorporare al drospirenonei in lipozomi precum si viteza de cedare a drospirenonei prin membrane sunt puternic influentate de compozitia transferozomilor raportul molar dintre fosfatidil colina, colat de sodiu si drospirenona si etozomilor procentul de alcool etilic, fosfatidil colina si drospirenona din formulare.

Bibliografie 1 Sitruk-Ware R. New progestagens for contraceptive use. Update,12 22. A novel ultradeformable vesicular carriers for transdermal drug delivery. Drug delivery technology,vol 5, no 3. Sectiunea A 1 Lucrari sectiunea poster Apoptoza este o forma de moarte celulara organizata si foarte strict controlata enzimatic.

In timpul apoptozei, membrana plasmatica genereaza corpii apoptotici CA. Pentru a facilita recunoasterea CA de catre fagocite, celula semnalizeaza mediului extracelular starea sa apoptotica prin modificarea moleculelor de fosfatidilserina si trasportul acestora de pe fata citosolica a membranei pe cea extracelulara Encyclopedia of Life Science, Apoptoza celulelor melanom B16 a fost studiata prin spectrometrie UV-viz si spectrometrie FTIR care permite identificarea legaturilor chimice superficiale ale probelor analizate: Din punct de vedere al atribuirii benzilor spectrale se disting trei domenii importante pentru studiul de fata: The developed protocols using this kind of material are advantageous in terms of simple experimentation, reusable catalyst, excellent yields of the products, short reaction time and preclusion of toxic solvents.

In this work, we have reported novel synthesis and characterization of supported SnO2 catalysts.

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The photocatalytic degradation of Eosin Y dye, an anionic xanthene fluorescent dye, has been investigated in aqueous heterogeneous solutions containing SnO2 as photocatalysts. Toxicity experiments showed a reduction of the toxicity of an eosin Y dye solution of photocatalytic treatment. Alergenii si microorganismele sunt prezente in viata noastra de zi cu zi fara ca noi sa le remarcam prezenta.

Ele vin in contact direct cu organismul prin ingerare, cu pielea umana, caile nazale sau prin intermediul textilelor. Acestea din urma pot sa contina sau nu si un material polimeric acrilic care prin reticulare sa asigure o rezistenta mai buna a filmului la suprafata textila. Moreover, their biocompatibility, high in vivo stability, low toxicity, high carrier capacity, feasibility of incorporation in their structure of both hydrophilic and hydrophobic drugs, and feasibility of variable routes of administration have improved their applicability.

In this work, SBA mesoporous silica was used as carrier for the following antihypertensive agents - Captopril the first ACE inhibitor and Aliskiren the first in a direct rennin inhibitor - in order to obtain controlled release formulation. The main advantages of the obtained drug delivery systems are the gradual drug release behavior and the lack of toxicity, which open the opportunity for their prospective uses as for considering them as potential formulations with only once daily administration.

Metoda TB este folosita cu succes pentru calculul proprietatilor electronice si optice atat la nivel empiric cat si ab-initio. Calitatea principala a metodei TB este faptul ca mentine caracterul atomistic al fenomenului descris, calitate care este esentiala pentru descrierea sistemelor nano. Datorita eficientei computationale, metoda TB empirica, care foloseste parametrii ajustabili in functie de experimente sau calcule mai exacte, este larg folosita pentru descrierea la nivel nanoscopic a structurilor si sistemelor complexe precum interfetele dintre solide, defectele din cristale, aliajele, materialele amorfe, nano-clusterii cat si dot-urile cuantice.

Metodele TB empirice sunt pana la 3 ordine de marime mai rapide decat metodele ab-initio bazate pe metoda functionalei densitate density functional theory-DFT. Pe de alta parte, metoda TB ab-initio numita DFT-TB-LMTO DFT-tight-binding-linear muffin-tin orbitals nu are niciun parametru ajustabil si este utilizata nu numai pentru descrierea cristalelor dar si pentru sistemele de dimensionalitate redusa cum ar fi structurile in staturi de ordinul nanometrilor.

In aceasta lucrare voi aborda descrierea TB pentru o serie intreaga de sisteme si probleme cum ar fi: Referinte bibliografice [1] T. Valorile plasmatice cresc dupa 3h de la debutul IMA si revin la normal dupa h. Dinamica modificarilor concentratiilor plasmatice ale hFABP este foarte asemanatoare cu a mioglobinei Myonumai ca hFABP prezinta o specificitate si sensibilitate superioara fata de Myo 1. Recunoasterea specifica a anticorpului anti-hFABP pe suprafata, transformarea semnalului fizico-chimic produs de interactia cu proteina, intr-un semnal corespunzator electric, opticprocesarea si amplificarea semnalului, constituie elementele principale pentru alcatuirea acestui imunosenzor.

Desi numarul si varietatea metodelor utilizate in alcatuirea imunosenzorilor este foarte mare, totusi specificitatea si selectivitatea sunt date de componenta biologica: Au si SiO2 cu formare de monostraturi autoasamblate, pentru imobilizarea covalenta a anticorpilor specifici; 2 imobilizarea covalenta a proteinei-test albumina bovina serica BSA 3 caracterizarea suprafetelor functionalizate prin metode fizico-chimice: Formarea de filme organice subtiri pe suprafetele metalice utilizate le confera acestora proprietati superioare in construirea unor noi dispozitive de cuantificare a unor proteine de mare interes in diagnosticul IMA, cu inalta sensibilitate si specificitate si timp de raspuns rapid fata de metodele actuale.

Van der Voort D. Se studiaza comportarea nanoparticulelor superparamagnetice in camp magnetic. Sunt considerate situatiile cand acestea sunt izolate sau in zona senzorului realizat din straturi magnetice subtiri. Pentru diametrul nanoparticulelor a fost aleasa o valoare de nm si se considera permeabilitate magnetica relativa de aproximativ Curbele de magnetizare simulate pentru nanoparticule sunt in bun acord cu rezultate experimentale camp de saturatie, aspectul curbei, etc.

Pentru manipularea acestor nanoparticule se propune un model simplu de circuit electric, in forma de V.

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Se analizeaza profilul campului magnetic creat si sunt calculate fortele magnetice de interactie. Este evidentiat un efect de pozitionare cu precizie a nanoparticulelor.

Efecte de autoaranjare a nanoparticulelor in zona senzorului magnetic au fost puse, de asemenea, in evidenta. Acest aspect se datoreaza unor campuri magnetice, cu gradienti mari, generate de catre senzori. Pentru detectia nanoparticulelor au fost considerati senzori spintronici cu efect magnetorezistenta gigantica GMR si cu efect Hall planar PHE. Prin simulari micromagnetice s-au obtinut caracteristicile de detectie ale acestor senzori in functie de numarul de nanoparticule magnetice.

A fost pusa in evidenta o dependenta a caracteristicii de detectie de pozitia acestora in zona senzorului. In final sunt prezentate cateva rezultate experimentale preliminare obtinute de catre autori. Atomistilor bis, CP MG-7, Romania Lucrarea raporteaza sinteza si proprietatile vibrationale ale materialului compozit bazat pe poli o-fenilen diamina si nanotuburi de carbon, utilizand ca agenti de propagare a lantului macromolecular compusi cu proprietati oxidante diferite precum acidul fosformolibdic H3PMo12O40 x H2O si FeCl3.

Utilizand spectroscopia Raman noi aratam ca interactia chimica a nanotuburilor de carbon cu un singur perete SWNTs cu H3PMo12O40 x H2O conduce la nanotuburi de carbon functionalizate cu polioxometalati SWNTs-PMo12structuri care pot fi folosite cu succes ca material activ de electrod pentru supercapacitorii electrochimici [1].

Un argument in acest sens este prezentat de noile linii Raman cu maximele situate la ca. Dispozitivele electronice pe SiC ofera posibilitatea functionarii la temperaturi ridicate si in medii ostile. Unul din factorii limitativi in domeniul temperaturilor de lucru este contactarea dispozitivului. Desi acesta permite functionarea la temperaturi ridicate maxim oC pana in prezent dispozitivele incapsulate depasesc foarte rar oC. Tehnologiile utilizate in cazul Si nu au fost dezvoltate pentru temperaturi mai mari de oC, deoarece dispozitivele nu functionau peste oC.

In cazul SiC este necesara conceperea unei tehnologii de contactare noi care sa nu limiteze functionarea dispozitivului in temperatura. Prezenta lucrare propune o solutie pentru contactarea senzorilor de temperatura realizati pe SiC, respectiv, utilizarea unei paste nanocompozit pe baza de Ag care sinterizeaza la temperaturi joase desi punctul de topire este peste oC.

Pasta a fost testata pentru o serie de aplicatii de putere la vehicule electricesisteme optice diode laser si LED de putere si module de comunicatii.

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In lucrare se prezinta structura nanocompozitului, tehnica de sinterizare, modul de folosire. Folosirea acestei paste pentru senzorii de temperatura ofera garantia unor contacte robuste pana la temperaturi de oC.

As the limited compatibility of this filler with most matrices constitutes an important bottleneck in the area of resulted nanocomposites, the focus of the work was to drive these materials into a regime where they can favorably interact with the matrix.

Through variation of gas composition and experimental parameters, the laser-induced pyrolysis leads to carbon nanoparticles with different morphologies and, favored by the radical mechanism of formation and the presence of heterogeneous atoms, allows the in-situ functionalization with appropriate reactive groups.

For carbon nanopowders with an apparent density of 0. Micro-structurare laser in materiale fotosensibile folosind absorbtia bifotonica. In urma absorbtiei neliniare au loc modificari fizico-chimice ale materialului la nivel submicrometric. In materialele de tip fotorezist folosite in fotolitografia clasica, transparente la radiatia NIR infrarosu apropiatputem focaliza pulsurile laser cu emisie la nm in volumul materialului fara ca radiatia optica sa fie absorbita la suprafata.

In procesul interactiei bifotonice, in centrul spotului laser focalizat unde intensiatea laser depaseste pragul efectului neliniar, materialul absoarbe doi fotoni la nm, cu energie echivalenta cu a unui singur foton la nm, initializand astfel procesul de fotopolimerizare a materialului.

Deoarece procesul are loc doar in centrul spotului laser focalizat, prin fotopolimerizarea de doi fotoni pot rezulta structuri cu dimensiuni sub limita de difractie. Prin deplasarea controlata de calculator a fascicolului laser focalizat prin volumul materialului transparent se poate genera practic orice structura 2D si 3D dupa un design prestabilit. In acesta lucrare prezentam metoda si instalatia de micro-structurare laser in materiale fotosensibile folosind absorbtia de doi fotoni, precum si structurile realizate.

Folosind algoritmi similari metodei de tip rapid-prototiping s-au obtinut microstructuri 3D cu aplicatii in domenii precum microfluidica, suporti biologici pentru inginerie tisulara, dispozitive fotonice, tinte pentru experimente cu laseri de mare putere.

Se investigheaza numeric prin simulari de tip diferente finite in domeniul timp FDTD proprietatiile modale si de cuplaj ale acestui tip de dispozitiv calculandu-se astfel caracteristica spectrala.

Se considera influenta pierderilor radiatiei in metal si se optimizeaza parametrii geometrici pentru obtinerea unui factor de calitate ridicat. Borel, Photonic-crystal waveguide biosensorOpt. Express 15