【正文】 tes Clock Pulses for Display Circuit The function of this circuit is to supply one, two or three pulses at the output terminal R for each pulse generated at any of the terminals N or M, according to the voltage level at the input terminals J, K or L, output P will receive a pulse for each pulse generated at any of the input terminals N or function can be performed by the circuit shown in Figure 8, it consists of one ripple counter type 7493, one half of a dual JK masterslave flipflops circuit type 7476, three inverters, three 2input AND, one 3input AND, one 2input OR and one 3input OR a pulse is generated at either input terminals N or M, a high level voltage will be generated at the output Q of the will g a t e t h e I Khz signal to be connected to the input A of the ripple counter as well as to the output terminal one, two or three pulses are counted by the ripple counter, according to the level of voltage at the input terminals J, K and L, respectively, a high is generated to reset the counter and change the state of the flipflopsuch that Q bees , the 1 KHz signal is disabled to reach the outputerminal R or the input A of the ripple order to ensure the proper function of the circuit, the flipflop should be cleared whenever a new channel is has been achieved by the input 5 and will be explained later when describing the function of the channels rotary selector Circuit As shown in Figure 2, the display panel would contain three 4digit displays that give the sum of money required from each passenger separately as well as a one sixdigit display that gives the total ine of the possible wiring diagram for the display circuit is shown in Figure any of the rotary selector switches to fully clockwise direction will supply the corresponding display by5 volts through terminals 1, 2 and 3, corresponding display will be unblanked by supplying a low level of voltage through terminals A, C and G, terminals 8, D and H, respectively, at low level will keep them reset to corresponding display is then enabled by removing the low voltage from terminals B, D, and H, respectively, to be ready for counting the sum of money required from the corresponding passenger starting from counting pulses for these three displays are supplied through terminal total sum display will be enabled whenever any of the three displays is enabled(this is done by a 3input OR gate as shown in Figure 8).Retaining the contents of the last display will be done by unblanking it by supplying a low level of voltage to terminal I as shown in Figure 10 Over Between Time and Distance Fares In the following part, two different methods for changing over between time andistance fares are suggested: The first is to switch to time fare whenever the distance fare is less than the time , a simple look to fares table can show that time fare should be used whenever the taxicab moves with speed less than 50 m/ possible circuit that can perform this switching action is shown in Figure IO contains one rpm limit switch and a one inverter as well as two 2input AND contacts of the limit switch are normally closed and will be opened whenever the angular speed of the speedometer cablexceeds 50 second alternation is to connect the input of the inverter in Figure 10 the output terminal Q of the speedometer circuit, Figure this case, the switching into time fare will be done whenever the taxicab is at stand of the Rotary Selector Switches The voltage levels that should be supplied by the terminals of the rotary selector switches in order to ensure proper operation by the electronic circuit are given in Table of three rotary selector switches each witb four decks of five poles each, that satisfy the logic function of Table 3, is shown in Figure 10 any of the three switches into fully clockwise direction will pass through five function of the rotary selector switches can be described starting from the first position passing through variousteps until reaching the final position as follows: Initial position: In this position a low voltage level is applied to terminals I, 2 and 3, this will disconnect the 5 volts supply from the three first displays, set the three inputs of the number of passenger detection circuit CTI to low low voltage level is applied to terminals 8, D and H, this is to ensure that the total ine display is levels at terminals A, C, G and S are at no care I: Rotating any of the rotary selector switches one step toward clockwise direction will supply 5 volts to the corresponding display, provides a high level voltage at terminals 1, 2 or 3 indicating that one passenger have entered the high level voltage should be applied to terminals A, C or G in order to ensure that the corresponding display is still terminals B, D, H and S are kept 2: Rotating the rotary selector switch one step further, will change the state of voltages at terminal A, C or G to be at low level and unblanks the corresponding of voltages at terminals I, 2, 3 and S are remained B, D and H should be remained at low level to ensure that the corresponding readout is cleared to zero while unblanking the 、在不發(fā)達(dá)的國(guó)家，早上把人們從他們家送到工作的地方，然后下午送回來(lái)已成為一個(gè)大問(wèn)題，尤其是在大城市。在某些情況下（出租車的4個(gè)席位），他們可能只有出租車四分之一的收入（大部分的出租車司機(jī)）。我應(yīng)該指出，我所說(shuō)的長(zhǎng)期旅客指一個(gè)人或一組相關(guān)的人。因此，如果車速電纜耦合與速度傳感器，產(chǎn)生一個(gè)單脈沖每平方米的旅行距離，那么，我們的的士可以三倍于反模塊相與速度傳感器的單位。如果可以包含正弦波發(fā)生器的輸出連接到脈沖整形電路的永磁器件（2通用芯片二極管，1000歐姆的電阻和施密特觸發(fā)逆變器）。最后讀出的數(shù)據(jù)會(huì)包括停車的費(fèi)用等等費(fèi)用。它由五個(gè)部分指定的電腦符號(hào)與電話系統(tǒng)整合成為4個(gè)支撐電路，它們是：判斷乘客數(shù)量電路CT1，旅行距離電路CT2，等待時(shí)間電路CT3，時(shí)鐘脈沖顯示電路CT4。一種可能的邏輯圖的基礎(chǔ)上，上述源性表達(dá)。 J，K，L及F和一個(gè)輸出端N，這個(gè)電路的函數(shù)根據(jù)表格2的意思（車費(fèi)每2分鐘的等待時(shí)間）是在J，K和L分別供應(yīng)單脈沖到輸出端N時(shí)，提供單脈沖的輸出N。當(dāng)?shù)谝?，第二或第三個(gè)脈沖由漣波計(jì)數(shù)器開(kāi)始計(jì)數(shù)，J,K,L端會(huì)分別根據(jù)電壓的大小來(lái)使產(chǎn)生重置或者翻轉(zhuǎn)來(lái)改變狀態(tài)，然后Q端變?yōu)檩敵龅碗妷骸１３纸K端D和H在低級(jí)狀態(tài)下重置為零對(duì)應(yīng)的顯示分別通過(guò)終端B,D,H而改變低壓狀態(tài)，并準(zhǔn)備好從對(duì)應(yīng)的乘客那里計(jì)算出相應(yīng)的計(jì)數(shù)款額，計(jì)數(shù)脈沖這三個(gè)顯示器通過(guò)終端提供總額。功能選擇旋轉(zhuǎn)開(kāi)關(guān)功能選擇開(kāi)關(guān)旋轉(zhuǎn)的電壓應(yīng)提供的該終端的旋轉(zhuǎn)選擇開(kāi)關(guān)，以確保正常運(yùn)行的電子電路列于表3。終端1，2，3以及S上的電壓狀態(tài)保持不變。二、展示空間形態(tài)的特征展示空間必須滿足人的流動(dòng)或運(yùn)動(dòng)的基本需要，即在一定的時(shí)間過(guò)程中，通過(guò)對(duì)展示空間的認(rèn)知和感受來(lái)獲取信息。將展覽活動(dòng)在內(nèi)的多種文化活動(dòng)植入購(gòu)物領(lǐng)域，把人們從單調(diào)的購(gòu)物的環(huán)境中解脫出來(lái)，同時(shí)展覽活動(dòng)也成為商家品牌戰(zhàn)略的重要組成。漸進(jìn)線小組設(shè)計(jì)的梅塞德斯——奔馳博物館是一個(gè)不定形態(tài)展示空間的典型例子。展示形態(tài)中藝術(shù)和技術(shù)特點(diǎn)的結(jié)合體現(xiàn)，