Abstract: An elongate barrier comprising an elongate apertured load-bearing sheet material and an elongate apertured filter material attached to the load-bearing sheet material. The length of the filter material can be changed elastically so that the barrier material can be transported in the form of a roll which can be unrolled for installation.

Abstract: A control device which, when it is installed as part of a fence, allows a small animal to pass from a first side of the fence to the other side of the fence, but prevents an animal which has passed through the device from returning to the first side of the fence. The control device can comprise (1) a mouth which (i) is exposed on the first side of the fence and (ii) has an open cross-section, and (2) an extending passage which extends away from the mouth to an exit. The extending passage can narrow as it extends from the mouth to the exit.

Abstract: A fence for controlling the movement of animals. The fence comprises an elongate portion which is above ground level and which, in one way or another, make it more difficult for an animal to climb up the fence and/or deter an animal from attempting to climb up the fence. For convenience, the elongate portion is denoted a BB band. Fence components comprising BB bands, and methods for preparing them, are described.

Abstract: A control device which, when it is installed as part of a fence, allows a small animal to pass from a first side of the fence to the other side of the fence, but prevents an animal which has passed through the device from returning to the first side of the fence. The control device can comprise (1) a mouth which (i) is exposed on the first side of the fence and (ii) has an open cross-section, and (2) an extending passage which extends away from the mouth to an exit. The extending passage can narrow as it extends from the mouth to the exit.

Abstract: A protected drain assembly comprising a drain which is at least partially bordered by a hard surface, and which is protected by a drain cover assembly which comprises (A) a laminar sheet which (i) is on top of the drain and (ii) comprises a central portion which, when a sediment-containing liquid is placed on top of it, allows the liquid to pass through it, and (B) gaskets which (i) are attached to edges of the laminar sheet and (ii) secure the edges of the laminar sheet to the hard surface.

Abstract: A protected drain assembly comprising a drain which is at least partially bordered by a hard surface, and which is protected by a drain cover assembly which comprises (A) a polymeric sheet which is on top of the drain and (a) comprises a central portion which, when a sediment-containing liquid is placed on top of it, allows liquid to pass through it, or (b) is substantially impervious to water; and (B) gaskets which are attached to edges of the polymeric sheet and secure the edges of the polymeric sheet to the hard surface.

Abstract: A protected drain assembly comprising a drain which is at least partially bordered by a hard surface, and which is protected by a drain cover assembly which comprises (A) a polymeric sheet which (i) is on top of the drain and (ii) (a) is substantially impervious to water or (b) comprises a central portion which, when a sediment-containing liquid is placed on top of it, allows the liquid to pass through it, and (B) gaskets which (i) are attached to edges of the polymeric sheet and (ii) secure the edges of the polymeric sheet to the hard surface.

Abstract: An elongate barrier comprising an elongate apertured load-bearing sheet material and an elongate apertured filter material attached to the load-bearing sheet material. The length of the filter material can be changed elastically so that the barrier material can be transported in the form of a roll which can be unrolled for installation.

Abstract: An elongate barrier material comprising an elongate apertured load-bearing sheet material and an elongate apertured filter material attached to the load-bearing sheet material. The apertures in the filter material have an ASTM D-4751 size less than 500? and the size of the apertures in the load-bearing material is at least 4 times the size of the apertures in the filter material. The length of the filter material can be changed elastically so that the barrier material can be transported in the form of a roll which can be unrolled for installation.

Abstract: A protected drain assembly comprising a drain which is at least partially bordered by a hard surface, and which is protected by a drain cover assembly which comprises (A) a polymeric sheet which (i) is on top of the drain and (ii) (a) is substantially impervious to water or (b) comprises a central portion which, when a sediment-containing liquid is placed on top of it, allows the liquid to pass through it, and (B) gaskets which (i) are attached to edges of the polymeric sheet and (ii) secure the edges of the polymeric sheet to the hard surface.

Abstract: A protected drain assembly comprising a drain which is at least partially bordered by a hard surface, and which is protected by a drain cover assembly which comprises (A) a laminar sheet which (i) is on top of the drain and (ii) comprises a central portion which, when a sediment-containing liquid is placed on top of it, allows the liquid to pass through it, and (B) gaskets which (i) are attached to edges of the laminar sheet and (ii) secure the edges of the laminar sheet to the hard surface.

Abstract: Assemblies and methods for securing an elongate apertured fence to the ground. The fence includes an upper section which is apertured and which extends upwards from the ground, and a lower section which may or may not be apertured and which is not buried in the ground. The lower section is contacted by a footing member which is secured to the ground and which stabilizes the fence along a desired line along the ground. In some embodiments, the lower fence section is parallel to the ground, and at least part of the footing member lies between the lower fence section and the ground.

Abstract: The movement of small vertebrates, e.g. endangered or threatened species, into and/or out of defined areas, e.g. construction sites, is controlled by use of a barrier fence which includes an apertured polymeric sheet. The polymeric sheet includes an upper portion which extends upwards from the ground and a lower portion which is buried in the ground. The polymeric sheet is formed by first and second sets of polymeric strands which are bonded to each other and are spaced apart from each other, thus providing apertures. The height and depth of the barrier fence and the size of the apertures prevent the small vertebrates from crossing the fence, and the apertures permit wind and water flow through the barrier fence.

Abstract: Sediment control devices include a planar apertured threshold member, a planar apertured outflow member, and a planar filter member between the threshold and outflow members. The members lie in parallel planes, and there is substantially no hollow space between the threshold member and the outflow member.

Abstract: Sediment control devices (SCDs) include an apertured threshold member and an apertured outflow member, and optionally a filter member between the threshold and outflow members. In some SCDs1 the outflow member has a smaller aperture size than the threshold member, or vice versa. In some SCDs, a filter is placed in front of the threshold member. In some SCDs, there is a substantially hollow sediment control chamber (SCC) between the threshold and outflow members; in others, there is little or no hollow space between the threshold and outflow members. The SCDs can be constructed so that they are resistant to damage by wheeled traffic. The SCDs can be used to control sediment in run-off from a construction site, as drain covers, or as retaining members for lawns or planting areas. A number of SCDs can be joined together to form assemblies which are useful for stabilizing a land mass, for example a gully or river bank.

Abstract: The movement of small vertebrates, e.g. endangered or threatened species, into and/or out of defined areas, e.g. construction sites, is controlled by use of a barrier fence which includes an apertured polymeric sheet. The polymeric sheet includes an upper portion which extends upwards from the ground and a lower portion which is buried in the ground. The polymeric sheet is formed by first and second sets of polymeric strands which are bonded to each other and are spaced apart from each other, thus providing apertures. The height and depth of the barrier fence and the size of the apertures prevent the small vertebrates from crossing the fence, and the apertures permit wind and water flow through the barrier fence.

Abstract: Sediment control devices (SCDs) include an apertured threshold member and an apertured outflow member, and optionally a filter member between the threshold and outflow members. In some SCDs the outflow member has a smaller aperture size than the threshold member, or vice versa. In some SCDs, a filter is placed in front of the threshold member. In some SCDs, there is a substantially hollow sediment control chamber (SCC) between the threshold and outflow members; in others, there is little or no hollow space between the threshold and outflow members. The SCDs can be constructed so that they are resistant to damage by wheeled traffic. The SCDs can be used to control sediment in run-off from a construction site, as drain covers, or as retaining members for lawns or planting areas. A number of SCDs can be joined together to form assemblies which are useful for stabilizing a land mass, for example a gully or river bank.

Abstract: Sediment collection devices (SCDs) which can be used to collect sediment from sediment-bearing liquid, for example runoff from construction sites, and which have improved durability, particularly when wheeled vehicles pass over them. The SCDs include a horizontal location member; and a generally vertical member comprising (1) a filter which has relatively small apertures therethrough, and (2) threshold and outflow members each of which have relatively large apertures therethrough and which together provide a sediment control chamber (SCC) between them. The height of the SCC is at least 1.5 times its width; and/or the SCC is shaped so that a vehicle wheel approaching the SCD contacts the SCD at a defined height and angle; and/or one or both of the threshold member and the outflow member has a bending or stiffening line such that different parts of the SCD respond differently to bending forces. Precursors and methods for making such SCDs are described.

Abstract: An improved high pressure sodium lamp is described utilizing a polycrystalline alumina arc tube that is hermetically sealed, at least at one end, with a polycrystalline alumina end closure. Said end closure novel member is shaped as a flat disc having the contour and size permitting partial insertion into the internal opening of said arc tube, along with having a larger size projection located adjacent one major surface of said disc externally of said arc tube and with said disc being hermetically sealed directly to said arc tube. In a preferred embodiment, said end enclosure member further includes a central aperture through which extends one of the thermionic electrodes contained within said arc tube.

Abstract: An improved high pressure sodium lamp is described utilizing a polycrystalline alumina arc tube that is hermetically sealed, at least at one end, with a polycrystalline alumina end closure. Said end closure novel member is shaped as a flat disc having the contour and size permitting partial insertion into the internal opening of said arc tube, along with having a larger size projection located adjacent one major surface of said disc externally of said arc tube and with said disc being hermetically sealed directly to said arc tube. In a preferred embodiment, said end enclosure member further includes a central aperture through which extends one of the thermionic electrodes contained within said arc tube.