'; OutString += ''; OutString += NavBar; if (Feedback.length>0){ OutString += '' } OutString += '

'; OutString += ''; OutString += Feedback; OutString += '

'; //Write it to the frame TopFrame.document.clear(); TopFrame.document.open(); TopFrame.document.write(OutString); TopFrame.document.close(); } function DisplayExercise(){ //Build the output string var OutString = ''; OutString += ''; OutString += '

'; OutString += ''; OutString += TitleCode; OutString += ''; OutString += NavBar; OutString += '

'; if (WordBox.length > 0){ OutString += WordBox; } OutString += ''; OutString += BuiltCloze; OutString += '

'; if (is.CRAPBrowser){OutString=ResolveAllURLs(OutString);} //Write it to the frame BottomFrame.document.clear(); BottomFrame.document.open(); BottomFrame.document.write(OutString); BottomFrame.document.close(); } function ShowClue(ItemNum){ //alert(ItemNum); State[ItemNum][0] = 1; WriteFeedback(I[ItemNum][2]); } function SaveCurrentAnswers(){ for (var i=0; i-1){ FirstBit = InString.substring(0, i); LastBit = InString.substring(i + Token.length, InString.length); InString = FirstBit + Replacement + LastBit; i = InString.indexOf(Token); } return InString; } I = new Array(); I[0] = new Array(); I[0][1] = new Array(); I[0][1][0] = new Array(); I[0][1][0][0]='alimentatore'; I[0][2]=''; I[1] = new Array(); I[1][1] = new Array(); I[1][1][0] = new Array(); I[1][1][0][0]='semionda'; I[1][2]=''; I[2] = new Array(); I[2][1] = new Array(); I[2][1][0] = new Array(); I[2][1][0][0]='semiperiodo'; I[2][2]=''; I[3] = new Array(); I[3][1] = new Array(); I[3][1][0] = new Array(); I[3][1][0][0]='carica'; I[3][2]=''; I[4] = new Array(); I[4][1] = new Array(); I[4][1][0] = new Array(); I[4][1][0][0]='Q'; I[4][2]=''; I[5] = new Array(); I[5][1] = new Array(); I[5][1][0] = new Array(); I[5][1][0][0]='frequenza'; I[5][2]=''; Text = new Array(); Text[0]='In un '; Text[1]=' stabilizzato a doppia '; Text[2]=' il condensatore elettrolitico presente C viene ricaricato ad ogni semiperiodo, ma deve fornire tutta la corrente erogata dall\'alimentatore fino alla semionda successiva.
Durante tale '; Text[3]='. per t=T/2, approssimando la curva di scarica in modo lineare, la quantit\u00E0 di '; Text[4]=' elettrica che il condensatore dovr\u00E0 fornire \u00E8 Q=Io*T/2 mentre la tensione non dovr\u00E0 variare pi\u00F9 di un certo deltaV (non volendo scendere al di sotto di un certo livello minimo di tensione).
Quindi la capacit\u00E0 cercata \u00E8 data dal rapporto tra '; Text[5]=' e deltaV:
C=Io*T/2/deltaV; essendo f=1/T la '; Text[6]=' del generatore di tensione, la formula diventa:
C=Io/(2*f*deltaV)'; State = new Array(); function StartUp(){ var i = 0; State.length = 0; for (i=0; i -1){ var TotalChars = GetGapValue(i).length; State[i][3] = (TotalChars-State[i][1])/TotalChars; if (State[i][0] > 0){State[i][3] = State[i][3]/2;} if (State[i][3]<0){State[i][3] = 0;} State[i][4] = 1; } else{ //Otherwise, add zero to the array and increment the hints for this item, as a penalty State[i][1]++; State[i][3] = 0; //then set the flag AllCorrect = 0; } } } //Calculate the total score var TotalScore = 0; for (i=0; i'; } Output += YourScoreIs + ' ' + TotalScore + '%.
'; if (AllCorrect == 0){ Output += '
' + Incorrect; } BuildExercise(); WriteFeedback(Output); DisplayExercise(); RestoreCurrentAnswers(); } function TrackFocus(BoxNumber){ CurrentWord = BoxNumber; } function CheckBeginning(Guess, Answer){ var OutString = ''; var i = 0; var UpperGuess = ''; var UpperAnswer = ''; if (CaseSensitive == false) { UpperGuess = Guess.toUpperCase(); UpperAnswer = Answer.toUpperCase(); } else { UpperGuess = Guess; UpperAnswer = Answer; } while (UpperGuess.charAt(i) == UpperAnswer.charAt(i)) { OutString += Guess.charAt(i); i++; } OutString += Answer.charAt(i); return OutString; } function FindLongest(InArray){ if (InArray.length < 1){return -1;} var Longest = 0; for (var i=1; i InArray[Longest].length){ Longest = i; } } return Longest; } function GetGapValue(GNum){ var RetVal = ''; if ((GNum<0)||(GNum>=I.length)){return RetVal;} if (eval('BottomFrame.document.Cloze.Gap' + GNum) != null){ RetVal = eval('BottomFrame.document.Cloze.Gap' + GNum).value; RetVal = TrimString(RetVal); } else{ RetVal = State[GNum][5]; } return RetVal; } function SetGapValue(GNum, Val){ if ((GNum<0)||(GNum>=I.length)){return;} if (eval('BottomFrame.document.Cloze.Gap' + GNum) != null){ eval('BottomFrame.document.Cloze.Gap' + GNum).value = Val; } } function FindCurrent() { var x = 0; FoundCurrent = -1; //Test the current word: //If it's state is not set to already correct, check the word. if (State[CurrentWord][4] != 1){ if (CheckAnswer(CurrentWord, false) < 0){ return CurrentWord; } } x=CurrentWord + 1; while (x -1){return ''} RightBits = new Array(); for (var i=0; i 0){ SetGapValue(CurrGap, HintString); State[CurrGap][1] = State[CurrGap][1] + 1; } WriteFeedback(GiveHint); } function Blank(){ return '

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