Abstract: One aspect of the invention provides a gas heater including: a structure that defines a gas flow path having an upstream end and a downstream end; a first heating element positioned in the upstream end of the flow path; a second heating element positioned downstream of the first heating element in the flow path; and a third heating element positioned downstream of the second heating element in the flow path. The second heating element has a larger cross-sectional dimension than the first heating element. The third heating element has an equal or larger cross-sectional dimension than the second heating element. The first heating element, the second heating element, and the third heating element are an identical material.

Abstract: Protective headgear that is wearable on a head of a user and may be configured to provide impact protection and contaminant protection. The protective headgear may comprise a helmet configured to protect the user's head against impacts and a contaminant blocker configured to protect against contaminants (e.g., infectants), such as pathogens (e.g., viruses, bacteria, or other microorganisms) or other biohazards, chemical hazards, or other hazardous substances, transmittable to or from the user (e.g. as part of spatter, an aerosol, or other droplets). The helmet and the contaminant blocker may be configured to connect or otherwise interact with one another to be usable together. This may facilitate their use to enhance protection of the user and/or an environment of the user, while maintaining performance of the user, including by providing breathability, being spatter proof, ensuring proper vision, being antifogging, being customizable, and/or having other desirable attributes.

Abstract: Protective headgear that is wearable on a head of a user and may be configured to provide impact protection and contaminant protection. The protective headgear may comprise a helmet configured to protect the user's head against impacts and a contaminant blocker configured to protect against contaminants (e.g., infectants), such as pathogens (e.g., viruses, bacteria, or other microorganisms) or other biohazards, chemical hazards, or other hazardous substances, transmittable to or from the user (e.g. as part of spatter, an aerosol, or other droplets). The helmet and the contaminant blocker may be configured to connect or otherwise interact with one another to be usable together. This may facilitate their use to enhance protection of the user and/or an environment of the user, while maintaining performance of the user, including by providing breathability, being spatter proof, ensuring proper vision, being antifogging, being customizable, and/or having other desirable attributes.

Abstract: Processes for producing intermediate materials used for perfumery, specifically, epimerized cyclohexenyl ketones, are disclosed. Processes for employing the epimerising reaction in an Aldol condensation reaction are also disclosed.

Abstract: Process for the conversion of sodium bromide to anhydrous hydrobromic acid and sodium bisulfate, said process with the following sequential steps: reaction of sodium bromide and sulfuric acid in a solution of water to produce hydrobromic acid and sodium bisulfate wherein the conversion of sodium bromide is greater than about 99%; adsorption of iron bromide onto a solid adsorbent; separation of hydrobromic acid and water from the sodium bisulfate; separation and drying of hydrobromic acid; and solidification of the sodium bisulfate into a flaked or granular form.

Abstract: A dispersion for making impression which are capable of gradually releasing antiseptic agent to the surface. The dispersion includes a silicone, a hydrophobic antiseptic agent which is incorporated into the silicone, with the concentration of hydrophobic agent in the dispersion being in the range of about 0.1% to 1% by weight of the total weight of the dispersion. The hydrophobic antiseptic agent is a mixture which includes a chelating agent, a phospholipid membrane attacking agent, and either a virus nucleocapsid attacking agent or a bacteria receptor site attacking agent.

Abstract: A reversible track section for a toy car circuit. The reversible track section has a length, two opposite ends, two opposite sides, a top surface and a bottom surface. The reversible track section includes a thin, elongated plate including a central recess on the top surface. The central recess is of given height and rectangular cross-section and extends over the length defining two narrow pathways on the bottom surface, and includes a pair of longitudinal flanges on each of the opposite sides extending perpendicular to the top surface and towards the bottom surface. The longitudinal flanges are of the same height as the central recess and each is provided with an integral, outwardly projecting extension of constant width.

Abstract: An all electrolytic method for quickly and efficiently producing a well roughened, substantially non-directional, fine honeycomb surface on an aluminum sheet which is characterized by excellent adhesion to coatings and therefore suitable for making lithographic printing plates. The method comprises graining said aluminum sheet with alternating current for less than about 10 seconds in a first aqueous electrolyte solution containing hydrochloric acid, washing and drying the resulting grained aluminum sheet, and then further graining said dried aluminum sheet with alternating current for less than about 10 seconds, preferably 5 to 10 seconds, in a second aqueous electrolyte solution containing nitric acid alone or admixed with hydrochloric acid to obtain the substantially non-directional, fine honeycomb surface on said aluminum sheet.