国产高清精品综合在线网址_亚洲中文av一区二区三区_一本大道无码av天堂_av无码精品一区二区三区四区_日韩在线高清_亚洲一区二区三区在线网址_麻豆aaa级片_婷婷网亚洲色偷偷男人的天堂_综合精品在线_欧美黄色一区_成人网综合_美女18禁永久免费观看网站_伊人涩涩涩涩久久久av_国产一级性_亚洲两性_国产成人免费精品_日韩精品极品视频在线_5060午夜_欧美色图网址_久久av片免费一区二区三区

歡迎來到上海天道儀器有限公司網站!
咨詢電話:17765106485,17310506168

當前位置:首頁   >  產品中心  >  一.核生化監測報警系統  >  4.丙種射線報警器  >  巴林右旗縣景點人防丙種射線報警器BL-BZ031

巴林右旗縣景點人防丙種射線報警器BL-BZ031

簡要描述:丙種射線報警器是一款用于實時監測環境中丙種射線強度,并在射線強度超出安全閾值時及時發出警報的專業設備。巴林右旗縣景點人防丙種射線報警器BL-BZ031

  • 產品型號:
  • 廠商性質:生產廠家
  • 更新時間:2025-08-31
  • 訪  問  量:32

詳細介紹

丙種射線報警器

一、產品概述

丙種射線報警器是一款用于實時監測環境中丙種射線強度,并在射線強度超出安全閾值時及時發出警報的專業設備。丙種射線,即伽馬射線,具有的穿透能力,過量的丙種射線輻射會對人體健康和環境造成嚴重危害。本報警器通過高靈敏度的探測元件,能夠快速、準確地感知丙種射線的存在及強度變化,為人員安全和環境防護提供可靠保障。

二、工作原理  巴林右旗縣景點人防丙種射線報警器BL-BZ031

1. 射線探測:報警器內置專門針對丙種射線的探測器,常見的如閃爍探測器。當丙種射線進入探測器時,會與閃爍體相互作用,使閃爍體原子中的電子躍遷到較高能級。當這些電子回到基態時,會以光子的形式釋放能量,產生閃爍光。

2. 信號轉換:產生的閃爍光由光電倍增管接收,光電倍增管將光信號轉換為電信號。它通過一系列的倍增極,將微弱的光電流進行放大,使得輸出的電信號強度足以被后續電路處理。

3. 信號處理與分析:放大后的電信號傳輸至信號處理單元,該單元會對信號的頻率、幅度等參數進行分析。通過與預設的安全閾值進行對比,判斷當前環境中的丙種射線強度是否超標。

4. 報警輸出:若分析結果顯示射線強度超出安全閾值,報警器的報警模塊會立即啟動,通過聲光等方式發出警報,提醒周圍人員注意。

三、產品特點  巴林右旗縣景點人防丙種射線報警器BL-BZ031

1. 高靈敏度:采用*的探測技術和優質的探測元件,能夠精準檢測到極低強度的丙種射線,不放過任何可能存在的輻射風險。

2. 快速響應:從檢測到射線強度變化到發出警報,整個過程響應迅速,確保在最短時間內通知相關人員,以便及時采取防護措施。

3. 穩定性強:具備良好的抗干擾能力,在復雜的環境條件下,如高溫、潮濕、電磁干擾等,仍能穩定可靠地工作,保證測量數據的準確性和報警功能的正常運行。

4. 多種報警方式:提供聲光報警功能,發出的聲音響亮且具有辨識度,光線閃爍明顯,即使在嘈雜或光線較暗的環境中也能被清晰感知。

5. 數據記錄與顯示:部分型號的報警器還具備數據記錄功能,可存儲一定時間段內的射線強度數據,方便后續查詢和分析。同時,配備顯示屏,實時直觀地顯示當前環境中的丙種射線強度數值。

四、應用場景

1. 核工業領域:在核電站、核燃料加工廠等場所,用于監測工作區域內丙種射線的強度,保障工作人員的安全,防止因輻射過量引發健康問題。同時,也用于監測核廢料儲存和處理區域,確保核廢料的存放環境安全,避免射線泄漏對周邊環境造成污染。

2. 醫療行業:在醫院的科室,對使用丙種射線進行治療的區域進行實時監測,確保治療過程中患者和醫護人員所接受的輻射劑量在安全范圍內,防止不必要的輻射傷害。此外,在放射性藥物的生產和使用場所,也需要使用丙種射線報警器來保障操作環境的安全性。

3. 科研機構:在涉及到丙種射線研究的實驗室,如核物理實驗室、放射性同位素應用研究室等,用于監測實驗過程中產生的射線強度,為科研人員提供安全的實驗環境,保證科研工作的順利進行。

4. 公共安全領域:在邊境口岸、海關等場所,用于檢測過往貨物、行李等是否存在非法攜帶的放射性物質,防止放射性物質的非法流通,保障公眾健康和國家安全。此外,在發生核事故等緊急情況時,可用于快速確定受污染區域的射線強度,為應急救援和防護工作提供重要依據。

五、操作方法

1. 開機與初始化:接通報警器電源,按下電源開關,報警器將自動進行初始化自檢。自檢過程中,顯示屏會顯示相關信息,如設備型號、軟件版本等,同時報警指示燈和蜂鳴器也會短暫工作,以檢查其是否正常。若自檢通過,顯示屏將顯示當前環境中的丙種射線強度初始值。

2. 參數設置:根據實際使用需求,可通過操作面板上的按鍵對報警器的報警閾值、數據記錄間隔等參數進行設置。例如,在核工業特定工作區域,可根據該區域的安全標準設定相應的報警閾值。設置完成后,按下確認鍵保存設置。

3. 實時監測:設備正常運行后,將持續實時監測環境中的丙種射線強度,并在顯示屏上動態顯示當前強度數值。當射線強度接近報警閾值時,報警器可能會發出預報警提示,如指示燈閃爍頻率加快等,提醒用戶注意。

4. 報警處理:一旦射線強度超出設定的報警閾值,報警器將立即發出聲光報警。此時,相關人員應迅速按照預先制定的應急預案采取行動,如疏散人員、對輻射源進行隔離等。同時,可通過查看報警器的數據記錄或連接外部數據管理系統,進一步了解射線強度變化情況,為后續處理提供依據。

5. 關機:使用完畢后,按下電源開關關閉報警器電源。若設備長時間不使用,建議拔掉電源插頭,以避免不必要的電力消耗和潛在的設備故障。

六、維護保養

1. 定期清潔:定期使用干凈、柔軟的布擦拭報警器的外殼,去除灰塵和污漬,保持設備外觀整潔。注意避免使用含有腐蝕性成分的清潔劑,以免損壞外殼材質。對于探測器部分,要特別小心,避免碰撞和刮擦,如有必要,可使用專門的清潔工具進行清潔。

2. 性能檢測:按照規定的時間間隔(如每月或每季度)對報警器進行性能檢測。可使用標準的放射性源對探測器的靈敏度進行檢測,確保其能夠準確檢測到丙種射線。同時,檢查報警功能是否正常,包括聲光報警是否清晰、響亮。若發現設備性能出現偏差,應及時進行校準或維修。

3. 電池維護(若適用):對于采用電池供電的報警器,要注意電池的維護。定期檢查電池電量,當電量過低時,及時更換電池,以保證設備的正常運行。同時,按照電池的使用說明進行正確的充電和使用,避免過度充電或過度放電,延長電池使用壽命。

4. 存儲環境:若報警器需要長時間存儲,應將其放置在干燥、通風良好、溫度適宜的環境中,避免受潮、高溫或低溫等惡劣環境對設備造成損害。存儲時,最好將設備裝入專門的保護箱內,并定期取出進行通電檢查,確保設備處于良好的備用狀態。

七、注意事項

1. 專業操作:本報警器應由經過專業培訓的人員進行操作和維護,操作人員應熟悉設備的工作原理、操作方法及相關安全知識,避免因誤操作導致設備損壞或造成安全事故。

2. 輻射安全:在使用過程中,雖然報警器本身不會產生輻射,但應始終遵循輻射防護的基本原則,盡量減少不必要的輻射暴露。避免在報警器附近放置強放射性物質,以免對設備造成性損壞。

3. 校準與認證:報警器應定期進行校準,以確保其測量結果的準確性。校準工作應由具備相應資質的專業機構進行,并獲取相關的校準證書。同時,設備應符合國家和行業的相關安全標準和認證要求,以保證其質量和安全性。

4. 故障處理:若報警器在使用過程中出現故障,如報警異常、顯示錯誤等,應立即停止使用,并聯系專業的維修人員進行檢修。切勿自行拆解或維修設備,以免造成更嚴重的損壞或安全隱患。在故障未排除之前,不得將設備投入使用。


產品咨詢

留言框

  • 產品:

  • 您的單位:

  • 您的姓名:

  • 聯系電話:

  • 常用郵箱:

  • 省份:

  • 詳細地址:

  • 補充說明:

  • 驗證碼:

    請輸入計算結果(填寫阿拉伯數字),如:三加四=7
公司簡介  >  在線留言  >  聯系我們  >  

CONTACT

辦公地址:上海市奉賢區奉城鎮南奉公路686號4幢

TEL:17704076886

EMAIL:3154897564@qq.com
掃碼微信聯系
版權所有©2025 上海天道儀器有限公司 All Rights Reserved    備案號:滬ICP備2023003560號-1    sitemap.xml
主站蜘蛛池模板: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |