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  • 葡萄牙語的學習

    我想請教一下台灣有哪裡可以學葡萄牙語的場所或教人葡萄牙語語法的書刊

    附帶一提 我學葡萄牙語是希望能夠學到精通 了解複雜的文法 而不是像英語

    只會HOW ARE YOU GOOD MORNING這樣的表面功夫

    4 個解答語言5 年前
  • 員工下班時被遺忘

    倘若在下班期間有員工暫時沒離開(可能去跑廁所) 結果被其他同事疏忽被鎖在公司裡出不去 有這種可能嗎 倘若發生這種事應該怎麼做?

    1 個解答其他:工作與就業6 年前
  • 翻譯一段科技英文

    以下的英文請網友們翻譯一下吧

    The use of luminol for direct chemiluminescent detection of NO2 was demonstrated to have greater inherent sensitivity than the indirect ozone chemiluminescence detection, with reported detection limits of 30 ppt (Wendel et al. 1983). The luminol detection system uses a gas-liquid reaction leading to light emission with a maximum at approximately 425 nm. This emission, at the maximum sensitivity for most photomultiplier tubes, is responsible for the increased detection sensitivities. The biggest problem with the luminol method for direct measurement of NO2 has been interference from other soluble oxidants, particularly peroxyacyl nitrates (PANs).

    3 個解答語言8 年前
  • 翻譯一段科技英文

    以下的英文請網友們幫忙翻譯一下吧

    The main problem with this method is inherent difficulty in detecting the emitting species (excited NO2). This species emits over a broad region beginning at approximately 660 nm, with a maximum at 1,270 nm; thus, a red-shifted photomultiplier is required for detection.

    3 個解答語言8 年前
  • 翻譯一段科技英文

    以下的英文 請網友們翻譯一下吧

    We modified the first instrument by replacing the Unisearch (Scintrex) LMA-3 luminol detection system with a newly designed reaction cell and a Hamamatsu photon-counting detection module (HC-135).

    The reaction cell has a wick design similar to that of the commercial cell (Unisearch). However, our cell has been reconstructed to reduce dead volume and to deliver the effluent of the capillary column directly to the face of the wick. This increases sensitivity and reduces peak width, enabling shorter analysis times. An electronic sampling valve is used to collect a 5-cm3 air sample and inject it onto a 30-ft-long DB-1 capillary GC column for separation of NO2 and PAN. Synchronous control of the sample injection and data collection is accomplished with Labview 6.0 graphical programming software (National Instruments) operating in a Windows 2000 environment. This software package also allows for real-time integration of the chromatographic peaks and final storage of both the raw data and integrated values in spreadsheet format.

    2 個解答語言8 年前
  • 翻譯一段科技英文

    以下的英文請網友們翻譯一下吧

    The simultaneous measurement of NO2 and PAN enables determination of levels of the peroxyacetyl radical in the air, as PAN is in thermal equilibrium with the peroxyacetyl radical and NO2 (Gaffney et al. 2002). Past measurements of PAN and NO2 with this method were made in Centerton, New Jersey; Deer Park, Texas; and Phoenix, Arizona. We redesigned our previous instrument to make it smaller and lighter for easy deployment on aircraft platforms and modified the software to allow real-time data integration and synchronous operation of sample injection and data collection. In this work, we review the method and highlight the modifications made to the instrument, including a new cell design that enables easy monitoring of luminol detection with a Hamamatsu HC-135 photon counting system. We present data taken onboard the National Oceanic and Atmospheric Administration (NOAA) Twin Otter in the recent Bay Region Atmospheric Chemistry Experiment (BRACE) in Tampa, Florida, in May 2002. The NO2 concentrations measured by the fast GC-luminol technique are compared with simultaneous onboard measurements made by photolytic conversion of NO2 to NO followed by ozone chemiluminescence.

    2 個解答語言8 年前
  • 翻譯一段科技英文

    以下的英文請網友翻譯一下吧

    Along with NO2, PANs are important trace gas species associated with photochemical air pollution. The PANs are a class of organic oxidants having the general chemical structure RC=OO-O-NO2. Peroxyacetyl nitrate (PAN) is the primary peroxyacyl nitrate produced during the oxidation of hydrocarbons in the presence of NO and NO2. PAN is in thermal equilibrium with the peroxyacetyl radical (RC=O-OO.) and NO2 (Gaffney et al. 1989). Because PAN is a trapped peroxy radical, it is an important indicator species of the photochemical age of an air parcel, as well as a means for long-range transport of NO2 leading to the regional formation of ozone and other oxidants. Typically, PAN is measured by using a gas chromatograph (GC) with electron capture detection (ECD). Once automated, this method has been shown to be reliable and quite sensitive, allowing PAN to be measured in the troposphere at levels of low parts per trillion. Unfortunately, a number of other atmospheric gases (e.g., O2, Freons, H2O) also have strong ECD signals or act as inferences and limit the speed with which the analysis can be completed. Typically measurements are obtained at 15- to 30-min resolution. Currently, the shortest ECD analysis time for PAN is approximately 5 min (Williams et al. 2000).

    3 個解答語言8 年前
  • 翻譯一段科技英文

    想請網友們幫忙翻譯一下 因為是從pdf黨抓得所以有些亂

    For x = 0.05 and 0.09 samples, no satellite structure was observed above the Cu 2p3/2 peak, indicating that

    the only valence state of copper in these two samples is Cu(I). If Cu(II) is present in these glass samples, then

    the amount is too small to be detected by XPS. For the x --- 0.14 and 0.18 samples, there is a weak satellite at a

    binding energy ~ 9 eV greater than the main Cu 2p3/2 peak, indicating that both Cu(I) and Cu(II) coexist in

    these glass samples although, since the intensity of the satellite is very small compared to that observed in CuO,

    the amount of Cu(II) is expected to be small. As can be seen from Fig. 1, the intensity of the satellite for the

    x -- 0.14 sample is less than for the x = 0.18 sample. Furthermore, the Cu 2p3/2 peak width for the x < 0.14 samples is also smaller than that of the x = 0.18 sample (Table 2), and the Cu 2p binding energies of these three

    samples agree well with previously reported values for compounds containing Cu(I) [34]

    1 個解答語言8 年前
  • 翻譯一篇英文論文

    我有一篇英文論文 不過看不太懂

    能請造詣高深的網友翻譯一下嗎

    1 個解答其他:科學8 年前
  • 圓柱的論文搜尋

    我想要幾篇關於圓柱的論文 請網友幫忙一下吧

    1 個解答書籍與作家8 年前
  • 熱處理的過程與工具

    工程科學中熱處理操作主要分成什麼過程?做這種處理大都用什麼工具?

    拜託網友了!盡量詳細點!

    1 個解答工程學9 年前
  • 牛頓-拉福森法的方程組求解

    一聯立方程組x2+xy=10和y+3xy2=57 對x微分後為2x+y和3y2

    對y微分後為x和1+6xy

    倘若使用初始值x=1.5和y=3.5代入

    2x+y=2*1.5+3.5=6.5 3y2=3*3.5*3.5=36.75 x=1.5 1+6xy=1+6*1.5*3.5=32.5

    第一次的亞可比行列式為6.5*32.5-1.5*36.75=156.125

    初始猜測值為u=1.5*1.5+1.5*3.5-10=-2.5

    v=3.5+3*1.5*3.5*3.5-57=1.625

    得取新的x y值分別是

    x=1.5-[-2.5(32.5)-1.625(1.5)/156.125]=2.03603

    y=3.5-[1.625(6.5)-(-2.5)(36.75)/156.125]=2.84388

    然後再以x=2.03603和y=2.84388做初始值 反覆的做下去 直到x和y變成2和3為止

    以fortran來做該如何寫呢? thanks!

    1 個解答程式設計9 年前
  • 方程組的迭代法求解

    今有一聯立方程組x2+xy=10和y+3xy2=57 使用初始值x=1.5和y=3.5做計算

    一開始x=(10-xy)的開二次方

    y=(57-y)/3x的開二次方

    之後做運算x=10-1.5*3.5的開二次方為2.17945

    y=57-3.5/3*2.17945的開二次方為2.86051

    接著做第二次運算

    x=10-2.17945*2.86051的開二次方為1.94053

    y=57-2.86051/3*1.94053的開二次方為3.04955

    反覆做下去 直到x和y收斂到2和3為止

    倘若用fortran來寫 要怎樣做呢?拜託大家!

    1 個解答程式設計9 年前
  • 用割線法計算實根

    一方程式f(x)=0.95*x3-5.9*x2+10.9*x-6

    假設結果是0 x大約是3.34

    割線法計算為先套用2.5漢3.5這兩個值

    2.5代入方程式之後為-0.78125 3.5代入方程式之後為0.60625

    然後3.5-[0.60625(2.5-3.5)/-0.78125-0.60625]=3.063

    之後重新取3.5和3.063這兩個值

    3.063代入方程式之後為-0.6668

    然後3.063-[-0.6668(3.5-3.063)/0.60625-(-0.6668)]=3.29

    之後重新取3.063和3.29這兩個值

    3.29代入方程式之後為-0.17046

    然後3.29-[-0.17046(3.063-3.29)/-0.6668-(-0.17046)]=3.34

    我想用fortran程式配合這個割線方法 write出3.34這個實根

    應該怎麼寫呢? 拜託fortran厲害的朋友們!

    1 個解答程式設計9 年前
  • 用FORTRAN作割線法

    求出含數f(x)=-12-21x+18x2-2.4x3(三次曲線)之最小的實根 現在想用割線法計算

    直到百分容許誤差對應到三位有校位置為止

    我想用fortran程式來執行割線法 試問怎麼做呢? 22點!

    1 個解答程式設計9 年前
  • 有限制的等差級數

    試問用fortran如何寫一個程式-求1+2+3+4+5+6......+40之和 但總和超過1000即停止 並利用迴圈與exit指令?

    1 個解答程式設計9 年前
  • 閏年的程式寫法

    一年當中 若有366天則為閏年 其原則是以西元年為單位 逢4的倍數閏年 逢100的倍數不閏年 逢400的倍數恢復閏年 逢4000和10000的倍數再度取消閏年

    試問這程式若用fortran來寫的話 要怎樣寫出來呢?

    1 個解答程式設計9 年前
  • Java裡的程式問題

    請問在Java裡 public和private之間有何差異呢?是否都是宣告的意思?

    2 個解答程式設計10 年前
  • 一部電影的名稱

    我已不記的這部電影叫什麼 只記的一個特殊島嶼-消失島;座落在一個巨龜上面

    大家知道這部電影嗎?

    2 個解答電影10 年前