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1 previous
1. adjective1) (coming before) früher [Anstellung, Gelegenheit]; [Tag, Morgen, Abend, Nacht] vorher; vorig [Besitzer, Wohnsitz]the previous page — die Seite davor
2) (prior)2. adverbprevious to — vor (+ Dat.)
previous to — vor (+ Dat.)
previous to being a nurse, she was... — bevor sie Krankenschwester wurde, war sie...
* * *['pri:viəs]- academic.ru/57844/previously">previously- previous to* * *pre·vi·ous[ˈpri:viəs]adj attr, invall the singer's \previous engagements... alle bisherigen Auftritte des Sängers...\previous conviction Vorstrafe fno \previous experience required keine Vorkenntnisse erforderlich\previous holder/owner Vorbesitzer(in) m(f), voriger [o früherer] Besitzer/vorige [o frühere] Besitzerin2. (preceding) vorig, vorhergehendcould you please repeat the \previous question? könnten Sie die letzte Frage bitte wiederholen?on my \previous visit to Florida bei meinem letzten Besuch in Floridaon the \previous day am Tag davor [o zuvor]the \previous evening/week der Abend/die Woche zuvorthe \previous speaker der Vorredner/die Vorrednerinthe \previous summer im vorigen Sommer\previous year Vorjahr nt, Vorjahresperiode f, Vorjahresabschnitt m\previous year's balance Vorjahresbilanz f\previous year's figure Vorjahreszahl fthe \previous ten years die vergangenen [o letzten] zehn Jahre* * *['priːvɪəs]adj1) (= immediately preceding) vorherig; page, day vorhergehend; year vorangegangen; (with indef art) früherthe previous page/day/year — die Seite/der Tag/das Jahr davor
the/a previous holder of the title — der vorherige/ein früherer Titelträger
in previous years — in früheren Jahren, früher
he's already been the target of two previous attacks — er war schon das Opfer von zwei früheren Angriffen
in a previous incarnation or life — in einem früheren Leben; (fig) früher im Leben
from a previous relationship — aus einer früheren Beziehung
he beat his previous best (Sport) — er hat seine bisherige Höchstleistung überboten
have you made any previous applications? — haben Sie sich davor or früher schon einmal beworben?
on a previous occasion — zuvor, bei einer früheren Gelegenheit
no previous experience necessary — Vorkenntnisse (sind) nicht erforderlich
previous owner — Vorbesitzer(in) m(f)
3)previous to — vor (+dat)
previous to going out — bevor ich/er etc ausging
* * *previous [ˈpriːvjəs; -vıəs]A adj1. vorher-, vorausgehend, Vor…:he has had no previous convictions er ist nicht vorbestraft;previous endorser, previous holder WIRTSCH Vormann m (beim Wechsel);previous knowledge Vorkenntnisse pl;without previous notice ohne vorherige Ankündigung;previous owner Vorbesitzer(in), frühere(r) Besitzer(in);previous question PARLa) Br Antrag, die Debatte zu beenden, um eine Abstimmung zu verhindern,b) Antrag, ohne weitere Debatte abzustimmen;previous year Vorjahr n2. umg verfrüht, voreiligprevious to moving here he lived in Glasgow bevor er hierher zog, lebte er in Glasgow* * *1. adjective1) (coming before) früher [Anstellung, Gelegenheit]; [Tag, Morgen, Abend, Nacht] vorher; vorig [Besitzer, Wohnsitz]2) (prior)2. adverbprevious to — vor (+ Dat.)
previous to — vor (+ Dat.)
previous to being a nurse, she was... — bevor sie Krankenschwester wurde, war sie...
* * *adj.bisherig adj.vor... adj.vorhergehend adj.vorherig adj.vorherigen adj. -
2 form
1. nounform of address — [Form der] Anrede
in human form — in menschlicher Gestalt; in Menschengestalt
in the form of — in Form von od. + Gen.
in book form — in Buchform; als Buch
take form — Gestalt annehmen od. gewinnen
3) (printed sheet) Formular, das4) (Brit. Sch.) Klasse, die5) (bench) Bank, diepeak form — Bestform, die
out of form — außer Form; nicht in Form
in [good] form — (lit. or fig.) [gut] in Form
she was in great form at the party — (fig.) bei der Party war sie groß in Form
on/off form — (lit. or fig.) in/nicht in Form
on/judging by [past/present] form — (fig.) nach der Papierform
true to form — (fig.) wie üblich od. zu erwarten
8) (etiquette)good/bad form — gutes/schlechtes Benehmen
9) (figure) Gestalt, die10) (Ling.) Form, die2. transitive verbbe formed from something — aus etwas entstehen
3) sich (Dat.) bilden [Meinung, Urteil]; gewinnen [Eindruck]; fassen [Entschluss, Plan]; kommen zu [Schluss]; (acquire, develop) entwickeln [Vorliebe, Gewohnheit, Wunsch]; schließen [Freundschaft]4) (constitute, compose, be, become) bilden3. intransitive verbSchleswig once formed [a] part of Denmark — Schleswig war einmal ein Teil von Dänemark
(come into being) sich bilden; [Idee:] sich formen, Gestalt annehmen* * *I 1. [fo:m] noun2) (a kind, type or variety: What form of ceremony usually takes place when someone gets a promotion?) die Art3) (a document containing certain questions, the answers to which must be written on it: an application form.) das Formular4) (a fixed way of doing things: forms and ceremonies.) die Formalität5) (a school class: He is in the sixth form.) die Klasse2. verb2) (to come into existence; to take shape: An idea slowly formed in his mind.) Gestalt annehmen3) (to organize or arrange (oneself or other people) into a particular order: The women formed (themselves) into three groups.) formieren4) (to be; to make up: These lectures form part of the medical course.) bilden•- academic.ru/28940/formation">formation- be in good form
- in the form of II [fo:m] noun(a long, usually wooden seat: The children were sitting on forms.) die Bank* * *[fɔ:m, AM fɔ:rm]I. nthe dictionary is also available in electronic \form es ist auch eine elektronische Version des Wörterbuchs erhältlichflu can take several different \forms eine Grippe kann sich in verschiedenen Formen äußernart \form Kunstform f\form of exercise Sportart f\form of government Regierungsform f\form of a language Sprachvariante flife \form Lebensform f\form of transport Transportart f\forms of worship Formen fpl der Gottesverehrungsupport in the \form of money Unterstützung in Form von Geldhelp in the \form of two police officers Hilfe in Gestalt von zwei Polizeibeamtenthe training programme takes the \form of a series of workshops die Schulung wird in Form einer Serie von Workshops abgehaltenin any [shape or] \form in jeglicher Formhe's opposed to censorship in any shape or \form er ist gegen jegliche Art von Zensurin some \form or other auf die eine oder andere Artapplication \form Bewerbungsbogen mbooking \form BRITreservation \form AM Buchungsformular ntentry \form Anmeldeformular morder \form Bestellschein mprinted \form Vordruck mher slender \form ihre schlanke Gestaltthe lawn was laid out in the \form of a figure eight der Rasen war in Form einer Acht angelegtthey made out a shadowy \form in front of them vor ihnen konnten sie den Umriss einer Gestalt ausmachenthe human \form die menschliche Gestaltto take \form Form [o Gestalt] annehmen\form and content Form und Inhaltshape and \form Form und GestaltI really need to get back in \form ich muss wirklich mal wieder etwas für meine Kondition tunto be in excellent [or superb] \form in Topform seinto be in good \form [gut] in Form seinto be out of \form nicht in Form seinthe whole team was on good \form die ganze Mannschaft zeigte vollen Einsatzshe was in great \form at her wedding party bei ihrer Hochzeitsfeier war sie ganz in ihrem ElementSunset's recent \forms are excellent die letzten Formen von Sunset sind hervorragendto study the \form die Form prüfenwhat's the \form? was ist üblich [o das übliche Verfahren]?conventional social \forms konventionelle Formen gesellschaftlichen Umgangsa matter of \form eine Formsachepartners of employees are invited as a matter of \form die Partner der Angestellten werden der Form halber eingeladenfor \form['s sake] aus Formgründento run true to \form wie zu erwarten [ver]laufentrue to \form he arrived an hour late wie immer kam er eine Stunde zu spätwhat's the infinitive \form of the verb? wie lautet der Infinitiv von dem Verb?to have \form vorbestraft sein[printing] \form [Satz]form fmatter and \form Stoff und Form19.II. vt1. (shape)▪ to \form sth etw formen\form the dough into balls den Teig zu Bällchen formenthese islands were \formed as a result of a series of volcanic eruptions diese Inseln entstanden durch eine Reihe von Vulkanausbrüchen2. (arrange)▪ to \form sth etw bildenthey \formed themselves into three lines sie stellten sich in drei Reihen aufto \form a circle/queue einen Kreis/eine Schlange bildento \form groups Gruppen bilden3. (set up)▪ to \form sth etw gründenthe company was \formed in 1892 die Firma wurde 1892 gegründetthey \formed themselves into a pressure group sie gründeten eine Pressuregroupto \form a band eine Band gründento \form committee/government ein Komitee/eine Regierung bildento \form friendships Freundschaften schließena newly-\formed political party eine neu gegründete politische Parteito \form a relationship eine Verbindung eingehen4. (constitute)▪ to \form sth etw bilden [o darstellen]the trees \form a natural protection from the sun's rays die Bäume stellen einen natürlichen Schutz gegen die Sonnenstrahlen darto \form part of sth Teil einer S. gen sein5. LINGto \form a sentence/the past tense/a new word einen Satz/die Vergangenheit[szeit]/ein neues Wort bilden▪ to \form sth/sb etw/jdn formenthe media play an important role in \forming public opinion die Medien spielen eine große Rolle bei der öffentlichen Meinungsbildungto \form sb's character jds Charakter formenhis strong features \formed into a smile of pleasure ein vergnügtes Lächeln legte sich auf seine markanten Züge* * *[fɔːm]1. n1) Form fforms of worship — Formen pl der Gottesverehrung
a form of apology —
in the form of — in Form von or +gen; (with reference to people) in Gestalt von or +gen
water in the form of ice —
her letters are to be published in book form — ihre Briefe sollen in Buchform or als Buch erscheinen
4) (ART, MUS, LITER: structure) Form fthe plural form — die Pluralform, der Plural
7) no pl (= etiquette) (Umgangs)form fhe did it for form's sake — er tat es der Form halber
it's bad form — so etwas tut man einfach nicht
8) (= document) Formular nt, Vordruck m9) (= physical condition) Form f, Verfassung fto be in fine or good form — gut in Form sein, in guter Form or Verfassung sein
to be on/off form — in/nicht in or außer Form sein
he was in great form that evening —
past form — Papierform f
on past form — auf dem Papier
10) (esp Brit: bench) Bank f12) no pl (Brit inf= criminal record)
to have form — vorbestraft sein13) (TECH: mould) Form f14)See:= forme2. vt1) (= shape) formen, gestalten (into zu); (GRAM) plural, negative bilden3) (= develop) liking, desire, idea, habit entwickeln; friendship schließen, anknüpfen; opinion sich (dat) bilden; impression gewinnen; plan ausdenken, entwerfen4) (= set up, organize) government, committee bilden; company, society, political party gründen, ins Leben rufen5) (= constitute, make up) part, basis bildenthe committee is formed of... — der Ausschuss wird von... gebildet
6) (= take the shape or order of) circle, pattern bildenor line (US) — eine Schlange bilden
3. vi1) (= take shape) Gestalt annehmen2) (ESP MIL) sich aufstellen or formieren, antreten/into two lines —
to form into a square to form into battle order — sich im Karree aufstellen sich zur Schlachtordnung formieren
* * *form [fɔː(r)m]A s1. Form f, Gestalt f:in the form of in Form von (od gen);in tablet form in Tablettenform2. TECH Form f:a) Fasson fb) Schablone f3. Form f:a) Art f:form of government Regierungsform;b) Art f und Weise f, Verfahrensweise f4. Formular n, Vordruck m:form letter Schemabrief m5. (literarische etc) Formform class LINGa) Wortart f,b) morphologische Klasse7. PHIL Form f:a) Wesen n, Natur fb) Gestalt f8. Erscheinungsform f, -weise f9. Sitte f, Brauch m10. (herkömmliche) gesellschaftliche Form, Manieren pl, Benehmen n:good (bad) form guter (schlechter) Ton;it is good (bad) form es gehört sich (nicht);for form’s sake der Form halber12. Zeremonie f13. MATH, TECH Formel f:form of oath JUR Eidesformelon form der Form nach;feel in good form sich gut in Form fühlen;at the top of one’s form, in great form in Hochform;be in very poor form in einem Formtief stecken15. a) ( besonders lange) Bank (ohne Rückenlehne)b) Br obs (Schul) Bank f16. besonders Br (Schul) Klasse f:form master (mistress) Klassenlehrer(in)18. Br sl Vorstrafen(liste) pl(f):he’s got form er ist vorbestraftB v/i1. formen, gestalten ( beide:into zu;after, on, upon nach):form a government eine Regierung bilden;form a company eine Gesellschaft gründen;they formed themselves into groups sie schlossen sich zu Gruppen zusammen;they formed themselves into two groups sie bildeten zwei Gruppen2. den Charakter etc formen, bilden3. a) einen Teil etc bilden, ausmachen, darstellenb) dienen als4. (an)ordnen, zusammenstellen6. einen Plan etc fassen, entwerfen, ersinnen8. Freundschaft etc schließen9. eine Gewohnheit annehmenC v/i* * *1. noun1) (type, style) Form, dieform of address — [Form der] Anrede
in human form — in menschlicher Gestalt; in Menschengestalt
in the form of — in Form von od. + Gen.
in book form — in Buchform; als Buch
take form — Gestalt annehmen od. gewinnen
3) (printed sheet) Formular, das4) (Brit. Sch.) Klasse, die5) (bench) Bank, diepeak form — Bestform, die
out of form — außer Form; nicht in Form
in [good] form — (lit. or fig.) [gut] in Form
she was in great form at the party — (fig.) bei der Party war sie groß in Form
on/off form — (lit. or fig.) in/nicht in Form
7) (Sport): (previous record) bisherige Leistungenon/judging by [past/present] form — (fig.) nach der Papierform
true to form — (fig.) wie üblich od. zu erwarten
8) (etiquette)good/bad form — gutes/schlechtes Benehmen
9) (figure) Gestalt, die10) (Ling.) Form, die2. transitive verb1) (make; also Ling.) bilden3) sich (Dat.) bilden [Meinung, Urteil]; gewinnen [Eindruck]; fassen [Entschluss, Plan]; kommen zu [Schluss]; (acquire, develop) entwickeln [Vorliebe, Gewohnheit, Wunsch]; schließen [Freundschaft]4) (constitute, compose, be, become) bildenSchleswig once formed [a] part of Denmark — Schleswig war einmal ein Teil von Dänemark
5) (establish, set up) bilden [Regierung]; gründen [Bund, Verein, Firma, Partei, Gruppe]3. intransitive verb(come into being) sich bilden; [Idee:] sich formen, Gestalt annehmen* * *Schulklasse f. n.Form -en f.Formblatt n.Formular -e n.Gattung -en f.Gestalt -en f.Schalung -en f. (seating) n.Schulbank m. v.bilden v.formen v.gestalten v. -
3 day
day [deɪ]1 noun∎ it's a nice or fine day c'est une belle journée, il fait beau aujourd'hui;∎ on a clear day par temps clair;∎ a summer's/winter's day un jour d'été/d'hiver;∎ to have a day out aller passer une journée quelque part;∎ a day at the seaside/the races une journée au bord de la mer/aux courses;∎ we went to the country for the day nous sommes allés passer la journée à la campagne;∎ to have a lazy day passer une journée à paresser;∎ literary when day is done quand le jour s'achève;∎ what day is it (today)? quel jour sommes-nous (aujourd'hui)?;∎ what day is she arriving (on)? quel jour arrive-t-elle?;∎ (on) that day ce jour-là;∎ (on) the day (that or when) she was born le jour où elle est née;∎ on the first/last day of the holidays le premier/dernier jour des vacances;∎ on a day like this/today un jour comme celui-là/aujourd'hui;∎ the day after, (on) the next or following day le lendemain, le jour suivant;∎ the day after the party le lendemain de ou le jour d'après la fête;∎ two days after the party le surlendemain de ou deux jours après la fête;∎ the day after tomorrow après-demain;∎ the day before, (on) the previous day la veille, le jour d'avant;∎ I had first met him two days before je l'avais rencontré l'avant-veille pour la première fois;∎ the day before yesterday avant-hier;∎ four days before/later quatre jours plus tôt/tard;∎ in four days, in four days' time dans quatre jours;∎ it took me four days to do it ça m'a pris quatre jours pour le faire;∎ once/twice a day une fois/deux fois par jour;∎ good day! bonjour!;∎ have a nice day! bonne journée!;∎ the other day l'autre jour;∎ Religion Day of Judgement (jour du) jugement dernier;∎ Religion day of atonement jour m du Grand Pardon;∎ dish of the day plat m du jour;∎ day of reckoning jour de vérité;∎ any day now d'un jour à l'autre;∎ day after day, day in day out jour après jour;∎ for days on end or at a time pendant des jours et des jours;∎ from day to day de jour en jour;∎ to live from day to day vivre au jour le jour;∎ from one day to the next d'un jour à l'autre;∎ from that day on or onwards à partir de ce jour-là;∎ from that day to this depuis ce jour-là;∎ literary from this day forth à partir ou à compter d'aujourd'hui;∎ to the day I die or my dying day jusqu'à mon dernier jour;∎ I'd rather work in Madrid any day (of the week) je préférerais largement ou de loin travailler à Madrid;∎ you've done enough mischief for one day tu as fait assez de bêtises pour une seule journée;∎ humorous another day, another dollar ≃ c'est le train-train quotidien;∎ from day one depuis le premier jour;∎ one day un jour;∎ one of these days un de ces jours;∎ some day un jour;∎ she's seventy if she's a day elle a soixante-dix ans bien sonnés;∎ he doesn't look a day older than 40/you il n'a pas l'air d'avoir plus de 40 ans/d'être plus vieux que toi;∎ he doesn't look a day older than when I last saw him il n'a pas vieilli d'un poil depuis la dernière fois que je l'ai vu;∎ it's been one of those days! tu parles d'une journée!;∎ on this (day) of all days! justement aujourd'hui!;∎ of all (the) days to choose for a conference! quelle idée d'avoir choisi de faire une conférence justement aujourd'hui!;∎ let's make a day of it passons-y la journée;∎ that really made my day! ça m'a fait très plaisir;∎ it's not my (lucky) day ce n'est pas mon jour (de chance);∎ familiar that'll be the day! (it's highly unlikely) il n'y a pas de danger que ça arrive de sitôt!;∎ at the end of the day à la fin de la journée; figurative en fin de compte, au bout du compte;∎ to carry or win the day gagner la journée ou la bataille(b) (hours of daylight) jour m, journée f;∎ all day (long) toute la journée;∎ we haven't got all day nous n'avons pas que ça à faire;∎ to travel during the or by day voyager pendant la journée ou de jour;∎ to sleep during the or by day dormir le jour;∎ day and night, night and day jour et nuit, nuit et jour;∎ in the cold light of day the plan seemed unfeasible avec un peu de distance critique, le projet semblait infaisable(c) (working hours) journée f;∎ paid by the day payé à la journée;∎ to work a seven-hour day travailler sept heures par jour, faire des journées de sept heures;∎ how was your day?, what kind of day have you had? comment s'est passée ta journée?;∎ did you have a good day? tu as passé une bonne journée?;∎ it's been a hard/long day la journée a été dure/longue;∎ day off jour m de congé;∎ day of rest jour m de repos;∎ it's all in a day's work! ça fait partie du travail!(d) (often pl) (lifetime, era) époque f;∎ in Caesar's day du temps de César;∎ in the days of King Arthur, in King Arthur's day du temps du Roi Arthur;∎ in days to come à l'avenir;∎ in days gone by par le passé;∎ in those days à l'époque;∎ what are you up to these days? qu'est-ce que tu fais de beau ces temps-ci?;∎ honestly, teenagers these days! vraiment, les adolescents d'aujourd'hui!;∎ in the good old days dans le temps;∎ in my/our day de mon/notre temps;∎ in this day and age de nos jours, aujourd'hui;∎ he was well-known in his day il était connu de son temps ou à son époque;∎ in his working/married days du temps où il travaillait/était marié;∎ in his younger days dans son jeune temps, dans sa jeunesse;∎ the happiest/worst days of my life les plus beaux/les pires jours de ma vie;∎ during the early days of the strike/my childhood au tout début de la grève/de mon enfance;∎ he ended his days in poverty il a fini ses jours dans la misère;∎ her day will come son heure viendra;∎ he's had his day il a eu son heure;∎ he's/this chair has seen better days il/cette chaise a connu des jours meilleurs;∎ those were the days c'était le bon temps(e) (battle, game)∎ to win or to carry the day l'emporter;∎ to lose the day perdre la partie∎ to work days travailler de jourdans huit jours aujourd'huijour pour jour;∎ it's a year ago to the day il y a un an jour pour jour ou aujourd'huià ce jour, aujourd'hui encore►► day bed lit m de repos;American day camp centre m aéré;∎ the children go to day care les enfants vont à la garderie;day centre = centre d'animation et d'aide sociale;day cream crème f de jour;day job travail m principal;∎ familiar humorous don't give up the day job (to aspiring artist etc) je ne crois pas que tu es prêt pour une carrière professionnelle;day labourer journalier(ère) m,f;day nurse infirmier(ère) m,f qui est de service de jour;day nursery garderie f;Stock Exchange day order ordre m valable pour la journée;day pass (for skiing) forfait m journalier;School day pupil (élève mf) externe mf;∎ to be on day release être en formation continue en alternance;Railways day return aller-retour m valable pour la journée;day room salle f commune;day school externat m;∎ to work the day shift travailler de jour, être (dans l'équipe) de jour;∎ when do you go on day shift? quand est-ce que tu prends le service de jour?;Stock Exchange day trade opération f de journée;Stock Exchange day trader spéculateur(trice) m,f à la journée;day trip excursion f;day tripper excursionniste mf;day work travail m de jour -
4 Froude, William
SUBJECT AREA: Ports and shipping[br]b. 1810 Dartington, Devon, Englandd. 4 May 1879 Simonstown, South Africa[br]English naval architect; pioneer of experimental ship-model research.[br]Froude was educated at a preparatory school at Buckfastleigh, and then at Westminster School, London, before entering Oriel College, Oxford, to read mathematics and classics. Between 1836 and 1838 he served as a pupil civil engineer, and then he joined the staff of Isambard Kingdom Brunel on various railway engineering projects in southern England, including the South Devon Atmospheric Railway. He retired from professional work in 1846 and lived with his invalid father at Dartington Parsonage. The next twenty years, while apparently unproductive, were important to Froude as he concentrated his mind on difficult mathematical and scientific problems. Froude married in 1839 and had five children, one of whom, Robert Edmund Froude (1846–1924), was to succeed him in later years in his research work for the Admiralty. Following the death of his father, Froude moved to Paignton, and there commenced his studies on the resistance of solid bodies moving through fluids. Initially these were with hulls towed through a house roof storage tank by wires taken over a pulley and attached to falling weights, but the work became more sophisticated and was conducted on ponds and the open water of a creek near Dartmouth. Froude published work on the rolling of ships in the second volume of the Transactions of the then new Institution of Naval Architects and through this became acquainted with Sir Edward Reed. This led in 1870 to the Admiralty's offer of £2,000 towards the cost of an experimental tank for ship models at Torquay. The tank was completed in 1872 and tests were carried out on the model of HMS Greyhound following full-scale towing trials which had commenced on the actual ship the previous year. From this Froude enunciated his Law of Comparisons, which defines the rules concerning the relationship of the power required to move geometrically similar floating bodies across fluids. It enabled naval architects to predict, from a study of a much less expensive and smaller model, the resistance to motion and the power required to move a full-size ship. The work in the tank led Froude to design a model-cutting machine, dynamometers and machinery for the accurate ruling of graph paper. Froude's work, and later that of his son, was prodigious and covered many fields of ship design, including powering, propulsion, rolling, steering and stability. In only six years he had stamped his academic authority on the new science of hydrodynamics, served on many national committees and corresponded with fellow researchers throughout the world. His health suffered and he sailed for South Africa to recuperate, but he contracted dysentery and died at Simonstown. He will be remembered for all time as one of the greatest "fathers" of naval architecture.[br]Principal Honours and DistinctionsFRS. Honorary LLD Glasgow University.Bibliography1955, The Papers of William Froude, London: Institution of Naval Architects (the Institution also published a memoir by Sir Westcott Abell and an evaluation of his work by Dr R.W.L. Gawn of the Royal Corps of Naval Constructors; this volume reprints all Froude's papers from the Institution of Naval Architects and other sources as diverse as the British Association, the Royal Society of Edinburgh and the Institution of Civil Engineers.Further ReadingA.T.Crichton, 1990, "William and Robert Edmund Froude and the evolution of the ship model experimental tank", Transactions of the Newcomen Society 61:33–49.FMW -
5 parallel UPS system
параллельная система ИБП
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[Интент]Parallel Operation: The system shall have the option to install up to four (4) UPSs in parallel configuration for redundancy or capacity.
1. The parallel UPS system shall be of the same design, voltage, and frequency. UPS modules of different size ratings shall be permitted to be paralleled together for purposes of increased capacity or UPS module redundancy. The UPSs in the parallel configuration shall not be required to have the same load capacity rating.
2. Parallel Capacity: With N+0 system-level redundancy, up to 2MW of load can be supported by the system.
3. Parallel Redundancy: With N+1 system-level redundancy, up to 1.5MW of load can be supported by the system, and only the UPS being replaced must be isolated from the source (bypass operation is not required for the entire system during the UPS replacement procedure).
4. Output control: A load sharing circuit shall be incorporated into the parallel control circuits to ensure that under no-load conditions, no circulating current exists between modules. This feature also allows each UPS to share equal amounts of the total critical load bus. The output voltage, output frequency, output phase angle, and output impedance of each module shall operate in uniformity to ensure correct load sharing. This control function shall not require any additional footprint and shall be an integral function of each UPS. The static bypass switches shall be connected in parallel.
5. Parallel System Controls: To avoid single points of failure, the UPS system shall have no single dedicated control system designed to control the operation of the parallel UPS system. Control of and direction of parallel UPSs shall take place via a master/slave relationship, where the first UPS to receive logic power asserts itself as a master. In the event of a master failure, a slave UPS shall take the role of master and assume the responsibility of the previous master UPS. Regardless of which UPS is master or slave, user changes to the system status, such as request for bypass, can be done from any UPS connected to the bus and all UPS on the bus shall transfer in simultaneously.
6. Communication: Communication between modules shall be connected so that the removal of any single cable shall not jeopardize the integrity of the parallel communication system. Load sharing communications shall be galvanically isolated for purposes of fault tolerance between UPS modules. A UPS module's influence over load sharing shall be inhibited in any mode where the UPS inverter is not supporting its output bus. Transfers to and from bypass can be initiated from any online UPS in the system.
7. Display: Each UPS multi-color LCD touch screen user interface shall be capable of using an active touch screen mimic bus to show the quantity of UPS(s) connected to the critical bus, as well as the general status of each UPS, such as circuit breaker status information. Any touchscreen display shall support the configuration of the [entire parallel] system and shall provide event and alarm data for all UPSs in the parallel configuration. A Virtual Display Application shall be available for download to the customer’s computer and shalll support remote monitoring of a complete system with up to 4 UPSs in parallel.
8. Battery runtime: Each UPS must have its own battery solution. The battery solution for the entire system can be a combination of standard and third-party batteries, but each UPS must use only one battery solution – either standard or third-party batteries.
9. Switchgear: A custom switchgear option shall be required for parallel operation.
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