中國新冠肺炎疫情持續升溫,廣東省深圳市13日突然宣布,自14日起實施封閉式管理,全員接受第3輪篩檢;與此同時,上海市13日也公告,配合疫情防控工作,上海所有客運站14日起暫停營運。
綜合中媒報導,與香港緊鄰的廣東省深圳市近期疫情擴散,13日宣布全市公車、地鐵等大眾運輸,14日至20日期間停駛,全市社區進入「封閉式管理」,所有人員居家辦公,除餐廳和民生必須行業,所有商店暫停營業,人員減少非必要流動,形同封城。
消息一出,不少深圳市民趕緊前往超市搶購糧食及日用品,從網上流傳的影像可以看見,結帳隊伍大排長龍,部分貨架上的商品也被掃空。
另一方面,上海市也因本土疫情持續延燒,先於12日發布公告,呼籲市民非必要不離開上海,要離開以及進入上海的人員,必須持有48小時內PCR檢測陰性報告。
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The log-periodic antenna as known as LPDA is a wideband directional antenna that provides gain and directivity combined over a wide band of frequencies.
Both Log-Periodic Antennas and Yagi antennas are high gain directional antennas. The main difference between these antennas is that Log-Periodic Antennas support wider frequency bandwidths and are physically much larger than Yagi antennas.
The log-periodic dipole array typical VSWR is 2:1 and operates over a much wider bandwidth and will have a lower gain for an equivalent number of elements.
In terms of its specification, a typical log periodic antenna might provide between 3 and 6 dB gain over dipole for a bandwidth of 2:1 while retaining a VSWR level of better than 1.3:1. With this level of performance, it is ideal for many applications, although a log-periodic antenna will be much larger than a Yagi of an equivalent gain.
EMC/EMI pre-compliance test antenna.
Very high gain over the full frequency range.
Meets latest EMC standards up to 7GHz.
Suitable even for immunity measurements
上海市交通部門13日也表示,上海全部客運自3月14日起停駛。據統計,從本月1日至12日,上海在這一輪疫情中已累計本土確診病例40例,本土無症狀感染者512例;16個行政區中,除了崇明區以外,均已發現感染者。
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