long-focus mirror

1) зеркало, отражатель, рефлектор || зеркальный

2) физ. зеркальная ловушка

3) плоскость симметрии, зеркальная плоскость

1.objective 2.lens 3.object-glass

раздвижная зрительная труба

telescope

1.объектив 2.передняя линза 3.объект

SUBJECT AREA: Electricity, Electronics and information technology, Telecommunications

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At the age of 17 Hertz entered the Gelehrtenschule of the Johaneums in Hamburg, but he left the following year to obtain practical experience for a year with a firm of engineers in Frankfurt am Main. He then spent six months at the Dresden Technical High School, followed by year of military service in Berlin. At this point he decided to switch from engineering to physics, and after a year in Munich he studied physics under Helmholtz at the University of Berlin, gaining his PhD with high honours in 1880. From 1883 to 1885 he was a privat-dozent at Kiel, during which time he studied the electromagnetic theory of James Clerk Maxwell. In 1885 he succeeded to the Chair in Physics at Karlsruhe Technical High School. There, in 1887, he constructed a rudimentary transmitter consisting of two 30 cm (12 in.) rods with metal balls separated by a 7.5 mm (0.3 in.) gap at the inner ends and metallic plates at the outer ends, the whole assembly being mounted at the focus of a large parabolic metal mirror and the two rods being connected to an induction coil. At the other side of his laboratory he placed a 70 cm (27½ in.) diameter wire loop with a similar air gap at the focus of a second metal mirror. When the induction coil was made to create a spark across the transmitter air gap, he found that a spark also occurred at the "receiver". By a series of experiments he was not only able to show that the invisible waves travelled in straight lines and were reflected by the parabolic mirrors, but also that the vibrations could be refracted like visible light and had a similar wavelength. By this first transmission and reception of radio waves he thus confirmed the theoretical predictions made by Maxwell some twenty years earlier. It was probably in his experiments with this apparatus in 1887 that Hertz also observed that the voltage at which a spark was able to jump a gap was significantly reduced by the presence of ultraviolet light. This so-called photoelectric effect was subsequently placed on a theoretical basis by Albert Einstein in 1905. In 1889 he became Professor of Physics at the University of Bonn, where he continued to investigate the nature of electric discharges in gases at low pressure until his death after a long and painful illness. In recognition of his measurement of radio and other waves, the international unit of frequency of an oscillatory wave, the cycle per second, is now universally known as the Hertz.

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See also: Heaviside, Oliver

opinion, notion, conviction, belief.

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► nombre femenino

1 (juicio) opinion, view

■ en mi opinión in my opinion, in my view

■ este colegio no me merece muy buena opinión I have a poor opinion of that school

\

cambiar de opinión to change one's mind

la opinión pública public opinion

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SF opinion, view

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femenino opinion

- opinión pública

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= claim, contention, feedback, judgement [judgment], regard, view, say, voice, perception.

Ex. The final justification is to be found in the claim that SLIS provide a form of information education that is not provided elsewhere.

Ex. The main contentions are that it would serve both the long-term interests of authors and publishers and the interests of users of information.

Ex. The statements are framed one at a time, and feedback is available at each stage, hence the term 'interactive searching'.

Ex. In my judgment, these changes will come about in one of two ways.

Ex. Their sheer institutional standing and regard have had a bearing upon the creation of a situation which is a good deal better than it might otherwise have been.

Ex. There is an alternative method for the design of subject retrieval devices, and that is to build languages or schemes which depend upon some theoretical views about the nature and structure of knowledge.

Ex. I've seen people clamor for a say and when it's given to them they don't take it.

Ex. I am particularly interested in hearing from practicing music and digital librarians, those in industry, and those who have had experience with other evaluation programmes, though all voices are welcomed.

Ex. Nevertheless, citation indexes do seek to link documents according to their content (or at least the perception of their content held by the author of the source work).

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* a la opinión pública = in the public eye.

* ante la opinión pública = in the public eye.

* apoyar un opinión = support + contention.

* artículo de opinión = discussion article, discussion paper, opinion article, feature article, opinion piece, op-ed.

* atrincherado en las opiniones de Uno = set in + Posesivo + opinions.

* cambiar de opinión = change + Posesivo + mind, change + feet, change + Posesivo + tune.

* cambiar de opinión a mitad de camino = change + horses in midstream.

* cambio de opinión = change of heart, change of mind.

* columna de opinión = op-ed.

* compartir la opinión de que = share + the view that.

* dar la opinión sobre = give + opinion on.

* dar una opinión = offer + opinion.

* de acuerdo con + Posesivo + opinión = in + Posesivo + view, in + Posesivo + opinion.

* defender un opinión = support + view.

* diferencia de opinión (sobre) = difference of opinion (on).

* diferencias de opinión = shades of opinion.

* discrepacia de opiniones = conflict of opinions.

* divergencia de opinión = divergence of opinion.

* división de opiniones = division of opinion, split decision, divided opinions.

* documento de opinión = discussion document.

* empresa dedicada a los sondeos de opinión = polling firm, polling agency.

* en contra de la opinión general = contrary to popular belief.

* en la opinión de = in the opinion of.

* en mi opinión = to my mind, in my opinion, to the best of my knowledge, in my view, to my knowledge, in my books.

* en + Posesivo + opinión = to + Posesivo + mind.

* escuchar la opinión de Alguien = hear + opinion.

* es mi opinión = my two cents' worth.

* expresar la opinión = volunteer + view.

* expresar la opinión de uno = make + Posesivo + feelings known, put + viewpoint across.

* expresar la opinión de uno sobre = give + Posesivo + thoughts on.

* expresar opinión = express + view.

* expresar opinión (sobre) = express + opinion (on).

* expresar + Posesivo + opinión = find + Posesivo + (own) voice, find + voice, find + a voice.

* expresar una opinión = voice + opinion.

* expresar una opinión sobre = state + opinion on, venture + opinion on.

* formarse una opinión = form + impression.

* grupo de opinión = focus group.

* haber división de opiniones = be split on, opinion + be divided.

* haber división de opiniones entre los críticos = critics + be divided.

* influir en la opinión pública = shape + public opinion, influence + public opinion.

* intercambiar opiniones = exchange + views, share + opinions.

* intercambio de opiniones sobre = exchange of opinion on.

* la opinión de otra persona = a second opinion.

* líder de opinión = opinion leader.

* manipular la opinión = manipulate + opinion.

* mantener una opinión = hold + view, hold + opinion.

* mi opinión = my two cents' worth.

* moldear la opinión pública = mould + public opinion.

* ofrecer una opinión = offer + opinion.

* opinión consensuada = consensus of opinion.

* opinión de la mayoría = majority opinion.

* opiniones diferentes = contrasting opinions.

* opiniones diversas = mixed reactions, mixed reviews.

* opiniones divididas = divided opinions.

* opiniones opuestas = contrasting opinions.

* opinión + estar dividida = opinion + be divided.

* opinión general = consensus, consensus of opinion, accepted wisdom, conventional wisdom.

* opinión general, la = received wisdom, the.

* opinión generalmente aceptada = conventional wisdom.

* opinión mayoritaria = majority opinion.

* opinión personal = personal opinion.

* opinión pública = outside-world, public opinion.

* opinión pública, la = public mind, the.

* opinión (sobre) = opinion (on).

* pedir la opinión sobre = ask for + opinion on.

* recabar la opinión = canvass + opinion.

* recabar la opinión pública = gauge + public opinion.

* recabar la opinión sobre = gauge + opinion on.

* recabar opiniones = solicit + input.

* recabar opinión sobre = elicit + opinion on.

* recabar + Posesivo + opinión = gauge + Posesivo + reaction.

* recabar una opinión = solicit + opinion.

* recibir opiniones diversas = receive + mixed reviews.

* reservarse la opinión = reserve + judgement.

* respaldar una opinión = buttress + claim, support + view.

* según la opinión de = in the opinion of.

* según mi opinión = to the best of my knowledge.

* según + Posesivo + opinión = in + Posesivo + view, in + Posesivo + opinion.

* ser de la opinión de que = be of the opinion that, be of the view that.

* sondear la opinión pública = gauge + public opinion.

* sondear la opinión sobre = gauge + opinion on.

* sondeo de opinión = opinion poll, Gallup poll, perceptions study, opinion polling.

* sondeo de opinión por teléfono = telephone opinion poll.

* sondeo de opinión pública = public opinion poll.

* sondeo informal de opinión = straw poll.

* sostener la opinión = argue.

* sostener una opinión = hold + view, hold + opinion.

* tener derecho a expresar + Posesivo + opinión = be entitled to + Posesivo + own opinion.

* tener la opinión = it + be + Posesivo + understanding.

* tener opinión = take + view.

* tener una opinión = take + viewpoint, hold + view, hold + opinion.

* tener una opinión sobre = have + an opinion on.

* una segunda opinión = a second opinion.

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femenino opinion

- opinión pública

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opinión (sobre)

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opinion

no comparto tu opinión sobre este tema I do not share your view o opinion o I disagree with you on this subject

¿cuál es tu opinión sobre el programa? what do you think of the program?

¿qué opinión le merece esta nueva producción? ( frml); what is your opinion of this new production?

en mi opinión fue un error in my opinion it was a mistake

cambió de opinión he changed his mind

es de la opinión de que no se les debe pegar a los niños she doesn't believe in hitting children, she is of the opinion that you mustn't hit children

importantes sectores de opinión piensan que … significant bodies of opinion think that …

es una cuestión de opinión it's a matter of opinion

no tengo muy buena opinión de él I don't think very highly of him, I don't have a very high opinion of him

la opinión pública public opinion

un cambio en la opinión pública a change in public opinion

no se puede engañar a la opinión pública con falsas promesas you cannot fool people o the public with false promises

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◊ en mi opinión in my opinion;

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opinión nf

opinion;

en mi opinión no deberíamos ir in my opinion, we shouldn't go;

es mi opinión personal that's my personal opinion;

¿cuál es tu opinión al respecto? what's your opinion o view on this matter?;

después de escuchar distintas opiniones sobre el tema… after hearing different views on the matter…;

compartir una opinión to share a view o an opinion;

he cambiado de opinión I've changed my mind;

expresar o [m5] dar una opinión to give an opinion;

reservarse la opinión to reserve judgment;

ser de la opinión de que to be of the opinion that;

ser una cuestión de opinión to be a matter of opinion;

tener buena/mala opinión de alguien to have a high/low opinion of sb

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f opinion;

la opinión pública public opinion;

en mi opinión in my opinion;

tener buena/mala opinión de alguien think highly/little of s.o.

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opinión nf, pl - niones : opinion, belief

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opinión n opinion / view

1) линза

2) объектив; окуляр; лупа

3) фотографировать

4) линзовая антенна

5) нефт. линзовидная залежь, линза || отлагаться в виде линзовидной залежи

6) акустическая линза

7) электронная линза