Abstract: A selectively absorbent layer for solar collectors, comprising a mixture of chromium oxides resulting from thermal decomposition of chromium hexacarbonyl or substituted chromium carbonyl. The absorbent layer is deposited from a process gas containing the carbonyl gaseous phase, oxygen, and inert carrier gas. An intermediate reflective layer is provided between the absorbent layer and the substrate.

Abstract: An improved solar-selective layer and method for producing the same on suitable substrates is discussed. In accordance with this invention, a metal layer is first of all deposited on a suitable substrate of a collector and is then oxidized at elevated temperature and pressure.

Abstract: A method for the production of homogeneous coatings of a substance comprising at least two metals and/or metal compounds on a substrate, which method comprises depositing the substance from a gas or liquid phase from dinuclear or polynuclear mixed metal compounds via a four step process comprising heating the substance to 85-90% of a final temperature over a period of 5 to 20 minutes, reducing the temperature to a second temperature which is 2/3 of said final temperature, maintaining the second temperature for 11/2 to 21/2 hours, raising the second temperature over a period of 20 to 40 minutes, and maintaining the final temperature for 1 to 2 hours. The coated materials are, for example, useful for coating solar collectors with an .alpha. of at least 0.70 and an .epsilon. no greater than 0.30.

Abstract: In order to improve the combustion of diesel engine fuels, mixtures of neutral salts of carboxylic acids and metals of Atomic Nos. 57 to 71 and free carboxylic acids are added thereto.

Abstract: Method for manufacturing solar absorption layers by electrodeposition of heavy metals, such as Ni and Co, from aqueous citrate solutions. The heavy metal citrates are produced by direct reaction of metal oxides or carbonates with citric acid. The electrolyte concentration is a maximum 5% and has a pH of between 8 and 11. The deposition process takes place at room temperature, bath voltages of 8 to 30 V, and current densities of 3 to 10 A/dm.sup.2. The layers produced by this method are well bonded black layers resistant to temperatures up to 700.degree. C.

Abstract: A thermoplastic moulding material utilizing Polyethylene having a molecular weight above 1,000,000 is provided. Moulding properties are improved by adding to the polymerizate a diphenylthiourea of the general formula: ##SPC1##Where R, and R.sub.2 are selected from the group consisting of hydrogen, alkyl groups with 1 to 8 carbon atoms and alkoxy groups with 1 to 4 carbon atoms. R, and R.sub.2 may be the same or different. Lubricants may also be added to the polymerizate.