Abstract: Filter caps 200, 400, 500, 600, 700 are provided that include internal geometry that modulate flow characteristics above the surface of a membrane filter held within the filter cap 200, 400, 500, 600, 700. The internal geometry in some cases provide for recirculation within the filter cap 200, 400, 500, 600, 700 that provides a cross flow element across the filter membrane that reduces clogging of the filter.

Abstract: A foldable convertible stroller for children, converting between stroller (concealed-stroller and open-stroller), playpen (full or partial), and folded configurations, featuring four U-shaped chassis support bars movable about joint side-hubs into a raised deployed position when fully expanded, when in a concealed-stroller or the playpen configuration, or a lowered deployed position when partially expanded, when in an open-stroller configuration, and foldable into a folded configuration by collapsing into a nested arrangement. The stroller further features a foldable base support, a circumferential main curtain spanning between the base and the upper front and rear support bars for surrounding the stroller in a playpen configuration, an optional foldable rest, and an optional handle portion of an upper rear support bar that allows selectively erecting and folding. A complementary method for converting the stroller between the configurations is also provided.

Abstract: A solar electricity generation system including a solar energy-to-electricity converter having a solar energy receiving surface including at least an electricity-generating solar energy receiving surface and a plurality of reflectors arranged to reflect solar energy directly onto the solar energy receiving surface, each of the plurality of reflectors having a reflecting surface which is configured and located and aligned with respect to the solar energy receiving surface to reflect specular solar radiation with a high degree of uniformity onto the solar energy receiving surface, the configuration, location and alignment of each of the reflectors being such that the geometrical projection of each reflecting surface is substantially coextensive with the electricity-generating solar energy receiving surface.

Abstract: A solar electricity generation system including a solar energy-to-electricity converter having a solar energy receiving surface including at least an electricity-generating solar energy receiving surface and a plurality of reflectors arranged to reflect solar energy directly onto the solar energy receiving surface, each of the plurality of reflectors having a reflecting surface which is configured and located and aligned with respect to the solar energy receiving surface to reflect specular solar radiation with a high degree of uniformity onto the solar energy receiving surface, the configuration, location and alignment of each of the reflectors being such that the geometrical projection of each reflecting surface is substantially coextensive with the electricity-generating solar energy receiving surface.

Abstract: A solar electricity generation system including a solar energy-to-electricity converter having a solar energy receiving surface including at least an electricity-generating solar energy receiving surface and a plurality of reflectors arranged to reflect solar energy directly onto the solar energy receiving surface, each of the plurality of reflectors having a reflecting surface which is configured and located and aligned with respect to the solar energy receiving surface to reflect specular solar radiation with a high degree of uniformity onto the solar energy receiving surface, the configuration, location and alignment of each of the reflectors being such that the geometrical projection of each reflecting surface is substantially coextensive with the electricity-generating solar energy receiving surface.