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農(nóng)業(yè)噴灌旋轉(zhuǎn)噴頭的工作原理誰(shuí)知道？請(qǐng)教一下，謝謝！

無(wú)限愛(ài)63254 2016-04-20 00:35:01 317  瀏覽

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  • 侉寫(xiě)甭5za5 2016-04-21 00:00:00
    利用水噴出的壓力打擊彈簧，在利用彈簧反彈的力量進(jìn)行旋轉(zhuǎn)。

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農(nóng)業(yè)噴灌旋轉(zhuǎn)噴頭的工作原理誰(shuí)知道？請(qǐng)教一下，謝謝！
　
2016-04-20 00:35:01 317 1
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2017-10-06 03:43:52 371 1
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條件有很多 重賞中?。?！
2016-02-15 16:08:45 523 1
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請(qǐng)問(wèn)有我是一名大學(xué)生是學(xué)的光電子專(zhuān)業(yè)老師Z近安排了一份作業(yè)給我們就是讓我們?cè)诰W(wǎng)上查找一篇關(guān)于液位傳感器的資料要求要知道其工作原理和原理圖，方框圖每個(gè)組成部分是怎么工作的可... 請(qǐng)問(wèn)有我是一名大學(xué)生 是學(xué)的光電子專(zhuān)業(yè) 老師Z近安排了一份作業(yè)給我們 就是讓我們?cè)诰W(wǎng)上查找一篇關(guān)于 液位傳感器的資料 要求要知道其工作原理和原理圖，方框圖 每個(gè)組成部分是怎么工作的 可是我在網(wǎng)上查了好久也沒(méi)查到我需要的資料 查到相關(guān)的也是一些不齊全的 希望好心的人 能幫助一下我 因?yàn)槊魈煸缟暇鸵蛔鳂I(yè)了 在找不到 就要挨老師的 罵了 展開(kāi)
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2018-12-08 10:01:26 291 0
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2006-06-01 23:35:50 446 1
請(qǐng)教電感三點(diǎn)式振蕩電路工作原理
如題。分析下圖中震蕩電路的工作原理。問(wèn)題1，振蕩信號(hào)在哪里輸出？問(wèn)題2，這個(gè)電路是如何把12v的直流信號(hào)變成帶頻率的交流正弦波信號(hào)的，關(guān)鍵元件是哪些？問(wèn)題3，附帶分析電路簡(jiǎn)圖中... 如題。分析下圖中震蕩電路的工作原理。問(wèn)題1，振蕩信號(hào)在哪里輸出？問(wèn)題2，這個(gè)電路是如何把12v的直流信號(hào)變成帶頻率的交流正弦波信號(hào)的，關(guān)鍵元件是哪些？問(wèn)題3，附帶分析電路簡(jiǎn)圖中，電容C2、C3的作用？謝謝指教！ 展開(kāi)
2012-05-26 22:39:23 591 2
請(qǐng)教英語(yǔ)高人，幫忙翻譯一下．急用，謝謝?。?！
Theelementalcontentofrawmaterials，phosphogypsum，substrate(potassiumsalt)，products(superphosphateand“Amofoska”)，soil，andgrasswasdeterminedusingconventionalandepithermaln... The elemental content of raw materials， phosphogypsum， substrate (potassium salt)， products (superphosphate and “Amofoska”)， soil， and grass was determined using conventional and epithermal neutron activation analysis using the IBR-2 pulsed fast reactor at Frank Laboratory of Neutron Physics (FLNP)， Joint Institute for Nuclear Research (JINR)， Dubna， Russia. The analytical procedure was described elsewhere by Frontasyeva and Pavlov [15]. Quality control was based on the application of certified reference materials (CRMs): IAEA-336 (lichens)， IAEA-SDM (lake sediment) and IAEA-SL1 (soil). The certified values and the results obtained by NAA were compared (Table 2). Concentrations of most elements were in good agreement with the CRMs except for Ti， Ni， Ce， Eu， Dy and Rb， which differed from the certified value as follows: Ti - 41.7 %， Ni - 26.5 %， Ce - 24.3 %， Eu - 32.9 % and Dy - 33.3 % in IAEA-SL1 (soil) and Rb - 20.6 % in IAEA-336 (lichens). For the 21 elements in agreement with the certified values the bias observed was below 20 %. For 11 elements (Al， V， Mn， As， Br， Sc， Cr， Sm， Na， Co and Sb)， the bias ranged from 0.03 % to 5 %， for 5 elements (Fe， Zn， Ba， Th and Cs) the bias was greater than 5 % but lower than 10 %， and for 5 elements (La， Tb， Hf， Ta and U) the bias was determined to be between 10 % and 20 %. Samples of raw materials， phosphogypsum， substrate， products， soil (of about 0.1 g)， and grass (0.3 g) were irradiated in cadmium-screened channels 1 and 2 of the pneumatic “Regata” system described elsewhere by Frontasyeva and Pavlov [15]. In order to determine elements associated with long-lived radionuclides， samples were irradiated for 100 hours. Spectra of induced gamma activity were recorded after 4 and 20-24 days of cooling. Short irradiations， 5 minutes for grass samples and 60 seconds for the remaining samples， allowed determination of Al， Ca， Cl， I， K， Na， Mg， Mn， Ti and V. Gamma-ray spectra were recorded after 5 and 12 minutes after irradiation. Data processing was performed using software developed at FLNP JINR [16， 17]. All gamma-spectrometers and counting electronics were made at JINR [16]. The software developed at FLNP JINR for peak searching， peak fitting， and nuclide identification routines were used for processing the amplitude spectra [16]. In the case of the lack of analytical data， there was a half of the detection limit inserted for each analyte [18]. Principal component analysis (classical PCA and fuzzy PCA) was performed as a tool for searching the possible correlations between environmental and industrial samples that could implicate the impact of phosphatic fertilizer production on the environment adjacent to the plant. 請(qǐng)給一個(gè)比較能看懂的翻譯，謝謝. 展開(kāi)
2007-06-03 08:49:34 477 1

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