Search results for "EWS"

Recensione di GALLIANI C., SCHERINI R. & PIGLIA A., 2017. Dragonflies and damselflies of Europe. A scientific approach to the identification of Europ…

2018

Recensione di GAUCI C., 2018. Dragonflies and damselflies of the Maltese islands. Birdlife Malta, Malta: 1-150. € 20

2018

Recensione di LEHMANN A. W. & NÜSS H., 2015. Libellen. Bestimmungsschüssel für Nord und Mitteleuropa. Deutscher Jugendbund für Naturbeobachtung, 200 …

2018

Segregation of lipid in Ir-dye/DMPA mixed monolayers as strategy to fabricate 2D supramolecular nanostructures at the air–water interface

2008

A novel pseudospherical fluorinated iridium(III) derivative, Ir-dye/PF6, [Ir(F2-ppy)2(bpy)]PF6 (F2-ppy = 2-(2,4-difluoro)phenylpyridine, bpy = 2,2′-bipyridine), has been organized by using a lipid matrix, DMPA (dimyristoyl-phosphatidic acid), in several molar ratios at the air–water interface. The molecular organization of both components and the degree of miscibility in the different mixed films have been inferred by surface techniques such as π–A isotherms, ellipsometry, reflection spectroscopy, Brewster angle microscopy (BAM), and IR spectroscopy for the LB films, additionally the results have been discussed according to the additivity rule. The equimolecular Ir-dye/DMPA mixture leads to…

PLZT Electro-optic Q-switch for Er:Cr:YSGG laser

1999

Q-switching of the Er:Cr:YSGG laser at 2.79 micrometers is realized using electrooptic modulators of PLZT X/65/35 ceramics. The high (but slow as compared with single crystals) electrooptical effect in PLZT allowed to construct Q-switches with an aperture larger than 4 X 4 mm 2 , small lengths of 3 - 6 mm, with a control voltage of 1000 - 1500 V. Q-switching is realized using modulators in two modes--as a (lambda) /2 switch placed into the laser cavity at the Brewster angle avoiding reflection losses and as a (lambda) /4 switch with higher single pass losses due to Fresnel reflections. A higher laser output was obtained using (lambda) /2 switching. The obtained pulses had a halfwidth of 150…

A Simple Apparatus for the Determination of the Optical Constants and the Thickness of Absorbing Thin Films

2001

We report on a simple and inexpensive apparatus useful for measuring the optical constants n, k and the thickness of weakly absorbing thin films. The measurement is based on an accurate determination of the reflectance and transmittance of a specimen illuminated by a laser beam. The laser beam is incident on a transparent substrate coated with the film to be evaluated, with an angle of incidence equal to the Brewster angle for the substrate, and its polarization can be switched between the p and s states. If the thickness is known to be within a presumptive range, measurements of the p and s reflectance and transmittance allow a calculation of the optical constants n, k and the thickness of…

Improvement of solid state Er:YAG pulse laser performance for use in medicine

1999

The large quadratic electro-optic effect of PLZT ceramics allows to design small size modulators for the solid state infrared Er:YAG laser (lasing at (lambda) equals 2.94 micrometers - the most pronounced absorption band of water), which has found application in medicine for efficient ablation of hard and soft tissues. In the free-running mode, the Er:YAG laser emits spikes that form the pulse envelope with duration of 150 - 800 microsecond(s) . An extracavity PLZT 8.5/65/35 ceramics modulator (aperture of 4 X 6 mm2 and length of 18 mm) was used to obtain (Pi) -shaped segments with the rise and decay times less than 5 microsecond(s) . That allows to reduce considerably the fraction of the p…

Bridging the gap between research and practice : using phenomenographic findings to develop training for career practitioners

2021

AbstractThis study contends that phenomenography offers both a useful research method and practical tools for developing education and training for career practitioners. After introducing the basic principles of phenomenography, the study reviews previous research on its potential in developing pedagogical practices. It explores how the phenomenographic findings were utilized to design an online skills training programme for career practitioners. The study finds that phenomenographic research serves three practical pedagogical purposes: (1) revealing how learners understand certain concepts or phenomena, (2) elucidating how these understandings differ; and (3) identifying critical aspects i…

"A 304-year experiment which worked some but not all of the time" : Britain and British identities in three English, Scottish and Welsh newspapers in…

2014

Britannia ja sen eri maat ovat unionin pitkän historian kuluessa kohdanneet lukuisia muutoksia ja haasteita. Viimeaikaisimmat näistä haasteista ovat liittyneet esimerkiksi siihen miten unionia ja sen maita hallitaan: vuonna 1997 unionin valtaa hajautettiin sisäisille paikallishallinnoille, jonka jälkeen muun muassa Wales on saavuttanut laajemmat oikeudet omien lakien säätämiseen ja Skotlanti on syksyllä 2014 äänestämässä mahdollisesta itsenäisyydestä. Tällaiset kehitykset herättävät kysymyksiä siitä, miten unioni nykyään toimii, kuinka vahvasti sen eri maat ovat sidoksissa toisiinsa, ja miltä sen tulevaisuus näyttää. Tämän tutkielman tarkoitus on tarkastella sitä, miten Britanniaa ja britti…

Mnemoniskie paņēmieni drukātajos sludinājumos

2021

Mūsdienās reklāmas tiek lietotas, lai ietekmētu patērētāju lēmumu pieņemšanu, un tajās tiek lietotas dažādas reklāmas metodes. Līdztekus citām metodēm, reklāmās tiek lietoti arī mnemoniskie paņēmieni, kas palīdz labāk atcerēties reklāmas tekstus. Šī darba mērķis ir izpētīt mnemoniskos paņēmienus un analizēt mnemonisko paņēmienu biežumu Lielbritānijas laikrakstos, izmantojot kvalitatīvās un kvantitatīvās pētījumu metodes - diskursa un biežuma analīzi. Kopumā tika analizēti četrpadsmit laikraksti, lai tajos atrastu mnemonisks ierīces. Šī pētījuma rezultāti apstiprina, ka 61 no 247 laikrakstu reklāmām ir mnemoniskie paņēmieni, visos 14 Lielbritānijas laikrakstos katrā laikraksta numurā ir vism…