摘要:
A method and device are disclosed for the determination of the environmental stress crack resistance (ESCR) of polymer articles made from polymers such as acrylonitrile-butadiene-styrene copolymers, polycarbonate, polystyrene and blends thereof. The method and device involve the external application of stress to an unstressed test article which has been exposed to a stress cracking agent. The stress is induced by means of a weight located below the horizontal plane of the plastic article. The time between the application of stress and the cracking of the test article is measured to compute a characteristic ESCR parameter and thereby evaluate the environmental stress crack resistance of the article.
摘要:
A method and device are disclosed for the determination of the environmental stress crack resistance (ESCR) of polymer articles made from polymers such as acrylonitrile-butadiene-styrene copolymers, polycarbonate, polystyrene and blends thereof. The method and device involve the external application of stress to an unstressed test article which has been exposed to a stress cracking agent. The stress is induced by means of a weight located below the horizontal plane of the plastic article. The time between the application of stress and the cracking of the test article is measured to compute a characteristic ESCR parameter and thereby evaluate the environmental stress crack resistance of the article.
摘要:
A heat dissipating device and method for dissipating waste heat produced by a solid state device, which includes (a) a solid state device and (b) a heat sink for dissipating waste heat produced by the solid state device which includes a base member being in thermal contact with the solid state device and a plurality of elongated heat conducting elements extending outwardly from the base member.
摘要:
Systems and methods are described for the construction of micro-optical couplers incorporating optical tapers to reshape multimode optical inputs. Incorporating tapers allows the spatial properties of the multimode inputs to be adjusted to match to the spatial properties of the output fiber, even in systems that are limited to unity-magnification imaging optics. In an exemplary embodiment, a larger-core multimode fiber and a smaller-core double-clad fiber are glued into a glass capillary, with the multimode fiber tapering to a smaller diameter inside the capillary. Polishing the capillary to expose the taper gives a multimode core that is smaller than the double-clad core. Imaging with unity magnification through a GRIN lenses and a dichroic reflector transfers the multimode input efficiently to the double-clad fiber with greater efficiency than would have been possible with the same optics and an untapered fiber. The dichroic reflector is transparent to a second singlemode signal input, which is collimated by a second GRIN lens and coupled to through the reflector to the core of the double-clad fiber. An isolator may be included in the signal beam path, and the double-clad fiber may be replaced by a double-clad gain fiber.
摘要:
Systems and methods for suppressing cladding modes at the signal wavelength in an optical fiber system utilizing an optical amplifier without perturbing the pump wavelength. An outer cladding of the gain fiber is removed providing a short section of a single mode fiber that does not guide the higher order modes, thus attenuating the higher order modes. Therefore, this system eliminates unwanted noise. In an embodiment, the modes are filtered at the end of the gain section of the optical fiber before splicing to an input fiber. Hydro florate etching can be utilized to remove the outer cladding. The resulting fiber maintains fundamental mode propagation and no mode mixing occurs while losing the higher order modes eliminating the noise.
摘要:
An apparatus for controlling the flow of a diluent to adjust the viscosity of a magnet wire coating enamel solution is disclosed. The apparatus comprises a flow loop, a pressure sensor, a proportional controller and a flow control valve.
摘要:
An ultra light, noise reducing composite (1) comprises an acoustically transparent, light weight film (6) between an underlay layer (5) and an air flow resistance layer (4). This composite allows to easily tune the acoustic properties by balancing the absorption and sound transmission behaviour of the composite (1). This air flow resistance layer (4) has an air flow resistance of between 500 Ns/m3 and 10,000 Ns/m3 and an area mass between 200 g/m2 and 3,000 g/m2. The underlay layer (5) has a stiffness value in the range between 100 Pa and 100,000 Pa. The light weight film (6) may consist of a synthetic foil and preferably has a thickness of 0.01 mm.
摘要翻译:一种超轻,降噪复合材料(1)包括在底层(5)和气流阻力层(4)之间的声透明的轻质薄膜(6)。 该复合物允许通过平衡复合材料(1)的吸收和声音传播行为来容易地调节声学性质。 该气流阻力层(4)的气流阻力为500Ns / m3〜10,000Ns / m3,面积质量为200g / m 3〜3,000g / m 2。 底层(5)的刚度值在100Pa〜100,000Pa的范围内,轻质薄膜(6)可以由合成箔构成,优选厚度为0.01mm。
摘要:
The present invention concerns an automotive protective mat (1), also known as throw in mat or protective mat. This mat comprises a microporous stiffening layer (2) (acoustical membrane). This layer may be composed of several sheets. The overall air flow resistance is between 500 Ns/m3–4000 Ns/m3. It is essential for this mat (1) that it is hydrophobic. In order to achieve an enhanced acoustical effectiveness a decoupling layer (6) is foreseen between the microporous stiffening layer (2) and the vehicle floor (8). This decoupling layer might be incorporated in the mat (1) or constituted by the underlaying carpet or sound absorber of the vehicle floor. Further layers or sheets such as adhesive layers, non skid layers, face fabrics or carpets and/or loft layers can be added to the claimed mat.
摘要翻译:本发明涉及汽车保护垫(1),也称为扔在垫子或保护垫中。 该垫包括微孔加强层(2)(声膜)。 该层可以由几张纸组成。 总气流阻力在500Ns / m 3 -4000Ns / m 3以下之间。 该垫(1)必须是疏水性的。 为了实现增强的声学效果,在微孔加强层(2)和车辆底板(8)之间预见到解耦层(6)。 该去耦层可以结合在垫子(1)中,或者由车底板的底垫地毯或吸声器构成。 另外的层或片如粘合层,非防滑层,面织物或地毯和/或阁楼层可以添加到要求保护的垫中。
摘要:
The optical output power from a GaInP based laser diode can be at least doubled by slight cooling of the device with thermoelectric cooling means when the diode is operated in a substantially room temperature environment.