Acoustic valve capable of selective and non-linear filtering of sound
    61.
    发明授权
    Acoustic valve capable of selective and non-linear filtering of sound 失效
    声门能对声音进行选择性和非线性过滤

    公开(公告)号:US6068079A

    公开(公告)日:2000-05-30

    申请号:US909429

    申请日:1997-08-11

    IPC分类号: A61F11/08 A61B7/02

    CPC分类号: A61F11/08 A61F2011/085

    摘要: Acoustic valve capable of selective and non-linear filtering of sound and placeable in a perforated ear plug. The acoustic valve consists of a tube enclosing two rigid disks axially spaced opposite each other, each of the disks containing at least one perforation. The total perforated surface of at least one disk is between 0.03 and 0.5 mm.sup.2.

    摘要翻译: 能够选择性和非线性地过滤声音并放置在穿孔耳塞中的声阀。 声阀由包围两个彼此轴向间隔开的刚性盘的管组成,每个盘包含至少一个穿孔。 至少一个盘的整个有孔表面在0.03和0.5平方毫米之间。

    Metal vapor laser tube
    62.
    发明授权
    Metal vapor laser tube 失效
    金属蒸气激光管

    公开(公告)号:US4694463A

    公开(公告)日:1987-09-15

    申请号:US870384

    申请日:1986-06-04

    IPC分类号: H01S3/03 H01S3/038 H01S3/097

    CPC分类号: H01S3/038 H01S3/031

    摘要: According to the invention, the metal vapor laser tube comprises a cylindrical plasma tube (1), which is located inside a leak-proof container (2) and which is surrounded by a thermal insulating material, an electrode (6) at each end of the plasma tube, and a cylindrical return conductor (9) coaxial to the plasma tube (1) which is connected with one of the electrodes, and characterized in that the return conductor (9) has a radius R of about: ##EQU1## where: e=exponential function,r=radius of the plasma tube, expressed in centimeters,dE/dV=energy density of the plasma, expressed in millijoules per cubic centimeter,ro=specific resistance of the plasma, expressed in Ohms.times.centimeter,U=electrical field, expressed in volts per centimeter.

    摘要翻译: 根据本发明,金属蒸汽激光管包括圆柱形等离子体管(1),其位于防漏容器(2)的内部并被绝热材料包围,电极(6)在每一端 等离子体管和与等离子体管(1)同轴的圆柱形返回导体(9),其与一个电极连接,并且其特征在于,所述返回导体(9)的半径R为大约:其中 :e =指数函数,r =等离子体管的半径,以厘米表示,dE / dV =等离子体的能量密度,以毫焦耳/立方厘米表示,ro =等离子体的电阻率,以欧姆浓度计表示,U =电 场,以伏/厘米表示。