中文字幕理伦午夜福利片_成人黄色在线免费观看_欧美黑人巨大videos极品_国产精品无码久久久久久_少妇人妻真实偷人精品视频_av在线高清观看_欧美黑人狂躁日本寡妇_国产精品久久久久久久久久免费看_大伊香蕉精品视频在线天堂_国产成人av片在线观看_av中文字幕不卡_丰满少妇大力进入av_亚洲欧美国产免费综合视频_玩弄人妻奶水无码av在线_精品无码一区二区三区电影_欧美丰满一区二区免费视频_国产亚洲欧洲综合5388_人人妻人人添人人爽日韩欧美_无码日韩人妻av一区免费_欧美激情网站

污水處理廠運維知識點大總結(八)

2023-01-05  來自: 環保水圈 瀏覽次數:369

五十四、校準曲線的檢驗

1、線形檢驗

即檢驗曲線的準確度。對于以4~6個濃度單位所獲得的測量信號值繪制的校準曲線,一般要求其相關系數|r|0.9990,否則應找出原因加以糾正,重新繪制出合格的檢驗曲線。

污水處理廠


2、截距檢驗

即檢驗校準曲線的準確度。在線形檢驗合格的基礎上對其進行線性回歸*,得出回歸方程y=a+bx。然后將所得截距a0t檢驗,當取置信水平、經檢驗無顯著性差異時,a可做0處理,方程簡化為y=bx,移項得x=y/b。在線性范圍內、可代替查閱校準曲線,直接將樣品測量信號經空白校正后,計算出試樣濃度。

a與有顯著性差異時,即示代表校準曲線得回歸方程的計算結果準確度不高,應找出原因并予以糾正后,重新繪制校準曲線并經線性檢驗合格,再計算回歸方程,經截距檢驗合格后投入使用。

回歸方程如不經上述檢驗和處理,即直接投入使用,必將給測定結果引入差值相當與截距a的系統誤差。

3、斜率檢驗

即檢驗分析方法的靈敏度。方法的靈敏度是隨實驗條件的變化而變化的。在完全相同的分析條件下,僅由于操作中的隨機誤差所導致的斜率變化不應超出允許范圍,此范圍因分析方法的精度不同而異。

五十五、標準物質對比分析

1、量值傳遞

將實驗室配制的樣品或控制樣品等,通過與標準參考物的對比,檢查它們的濃度值的誤差并加以修正。

2、儀器標定

對于采用直接定量法的儀器,采用標準參考物對儀器進行標定。

3、對照分析

在進行試樣分析的同時,用相近濃度的標準參考物或其稀釋液進行分析,根據標準參考物的實測值與保證值的符合程度,能夠確定試樣分析結果的準確度是否可以接受。

4、質量考核

以標準參考物作為未知樣,考核實驗室內分析人員的技術水平或實驗室間分析結果的相符程度,從而幫助分析人員發現問題和保證實驗室間數據的可比性。

五十六、事故預案

應包括:事故報警、應急處理、事故調查、責任處理、事故預防(工程技術措施、教育措施、管理措施)、事故報告、事故信息傳達。事故預案各步驟的參與者應在事故預案中有明確的規定(并應包含緊急聯系方式等),如事故調查由技術負責人和部門的負責人來完成。

五十七、電氣機械設備故障

1、事故報警

電氣設備和機械設備報警包括自動報警裝置報警和操作人員在巡檢過程中發現設備故障報警,發現事故報警后應立即向控制室報告,控制室在接到事故報警后應立即著手進行處理。設備事故報警后立即停止報警設備的運行并開啟備用設備維持正常運行。

操作人員到報警設備現場進行調整處理。如果報警設備沒有備用設備,則在停止運行后立即調整上、下游工藝流程的運行參數并立即通知值班負責人加強監控和派操作人員至報警設備處調整參數。

2、應急處理

操作人員到達設備報警現場后,應立即調查和排除故障,并檢查設備性能。如果設備損壞,則應報值班負責人共同確認后通知檢修人員對設備進行檢修。

3、事故調查

事故應急處理完畢,應由技術負責人、當班負責人和當班操作人員組成事故調查組,對事故原因進行調查,并填寫事故調查表,事故調查表完成后應抄送動力維修部和廠長辦公室。

4、責任處理

事故原因調查完成后,技術負責人應根據事故造成事故的原因追究相關人員責任,提出責任處理書面建議,送廠長辦公室。由廠長作出書面事故責任處理決定并在廠內公告欄內張貼。

5、事故預防

事故預防應從工程技術措施、教育措施和管理措施等三個方面進行,事故預防方案應由技術負責人負責總結形成書面報告后,由廠長決定并付諸實施。

6、事故報告

事故報告包括事故調查、事故責任處理和事故預防等三個方面的書面報告。事故報告由動力維修部負責整理并歸檔。

7、事故信息傳達

吸取教訓,防止事故發生。

五十八、遇通知停電怎么辦

在接到通知停電后15分鐘內,應撤消所有的運行命令。即關停正在運轉的設備。(記下正在運行的設備編號,以便來電恢復正常運行)。

待設備停止運轉后,脫開PC機與PLC間的通訊電纜,然后通知電工發出可停電信號。

如停電需超過半小時以上,應關閉所有的PLC及其相應的UPS電源。以免UPS過放電影響其使用壽命。

來電后,應重新對各PLC站供電,并逐個使CPU復位,連接PC機與PLC0間的通訊電纜(此時PC機應已在Windows 95平臺上),啟動T800DDE檢查通訊情況,若動態掃描正常,再重新啟動INTOUCH Windows Viewer,并檢查PLC站間的連接通訊情況,無誤后進入其它操作界面重新開啟設備。

五十九、遇非正常停電后怎么辦

首先檢查PC機與各PLC站間的通訊環路是否暢通,各PLCCPU工作是否正常。若正常,立即詢問停電原因,需要多長時間恢復供電,若停電時間大于半小時以上,應分別關斷各PLC站的UPSPC機同時退出監控系統。若很快恢復供電,操作人員待供電恢復后立即檢查界面“20”觀察各PLC站以及通訊環路是否正常。

通訊系統顯示正常,方可進行其它的操作任務。

若通訊系統死機或局部死機,應分別對已死機的PLC站重新復位。(一種方法,切斷電源,稍等片刻,再合上電源;另一種方法,使用棒形跳線器按壓CPU上的Reset鈕,強迫CPU重新裝載程序)

若正常后再恢復運行操作。

為了避免來電所帶的負載同時啟動,在送電前要求電工通過MCC柜屏上的轉換開關來解除已有的運行命令,盡量使系統在來電后降低啟動負荷。以免啟動負載過大造成供電系統出現閃落保護。

六十、物資驗收

物資驗收工作包括憑證驗收、交貨時間驗收、物資數量驗收、物資質量驗收、附件、專用工具、產品圖紙說明書操作維護手冊和價格驗收等工作。物資驗收應以采購合同為依據,驗收工作應由相關采購人員和庫存管理人員共同進行完成。必要時應邀請技術負責人,化驗室負責人和檢修負責人共同驗收。

驗收工作的程序為:準備驗收→測試→入庫→記錄過程。

六十一、物資的保管

根據要保存物資的特點,結合當地的客觀條件并補充必要的措施以滿足存放的環境和擬訂管理的方法?;炇沂褂玫脑噭⑺幤泛偷椭狄缀钠罚瑧换炇覂Υ娌⒂苫炇疫M行管理,同時化驗室應定期向倉庫管理人員匯報保存情況。庫內物資管理要點為:

1、數量準

入庫物資應計量和在物資登記卡上登記并簽名。做到賬卡一致,數量準確。

2、規格清、貨位固定化

庫存物資要按類別和規格分別存放,標志明顯,做到不臟不亂;儀器設備和貴重物資專庫加鎖;小件物資要五五擺放便于清數,大批物資分批整齊存放;易燃易爆,要雙人雙鎖專庫按規定分別保管;回收廢舊物資應與采購的物資嚴格分開。物資發放原則是先入庫先使用。

3、庫容整齊

經常打掃,保持清潔,物資擺放整齊美觀,用“分區分類,四號定位,立牌立卡,五五擺放”的科學方法進行管理。

4、認真管理好庫房內空氣的溫度、濕度,根據物資的性能特點和氣候特點開關門窗并使用各種能控制和調節氣溫、濕度的設備,使物資保持儲存環境。

5、防霉、防蟲、防鼠工作要經?;?,必要時使用藥劑防霉變、殺滅害蟲和老鼠。

6、做好防火、防水、防盜工作,下班時要停電、停火和關閉門窗,特別要注意可以自燃物品的自燃條件,嚴防火災的發生,若安裝有防盜報警器應檢查是否正常工作。

7、倉庫物資的盤點,經常性的檢查和盤點庫存物資,如果出現物資短缺或損壞、變質、陳舊、失效的存貨要注明金額,同時列入待處理財產。同時要查明損失的原因和責任并在廠長審批后,按原因和責任處理后銷帳。

衡水市衡美水處理設備有限公司,專營 淺層砂過濾器 過濾器 全自動加藥裝置 原水處理設備 等業務,有意向的客戶請咨詢我們,聯系電話:0318-2987119

CopyRight ? 版權所有: 衡水市衡美水處理設備有限公司 技術支持:衡水航宇 網站地圖 XML

本站關鍵字: 反滲透設備


掃一掃訪問移動端
主站蜘蛛池模板: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |