Renewables-2017

New kind of waterskiing/barefoot skiing. [4028]-27.07.2019 Author: Judbarovski, systems engineering, principle inventor, retired judbarovski@gmail.com , Israel From idea to invention passed three days, and that delay was used for better understanding, why waterskiing now used in two variants only: (1) with a help of motto-boat towing or (2) cable waterskiing (see Wikipedia)   Water skiing/barefoot skiing is excellent and healthy as fitness and water sport. It activates all muscles, including legs' ones. And it doesn’t need special weather and geographic conditions. Moreover it can be used in severe weather conditions as an extreme sport. My offer is simple, small and light equipment of quite safe usage. In my case a rider doesn’t need a help of other persons and their boat, and even no skis as a variant. The rider can start with himself, and can safe himself if accidents. The rider needs the towing thing too, and it is a motorized and controlled lifesav

Topic: Waste to Energy About typical mistakes of ideas to collect and even to sort the waste plastic Author: David Judbarovski, systems engineering, principle inventor, retired judbarovski@gmail.com , Israel I can’t deny a desirability to extract the waste plastic from nature and human living environment, even if being expensive in reasonable limits. Moreover, it can be profitable business in some practical cases. But to collect and even to sort any waste plastic at home before throwing, it is counterproductive and non-comfortable, and can be even not healthy, especially if food plastic. Much more reasonable the waste plastic to be thrown jointly with other unsorted home garbage to municipal garbage container for following garbage industrial treatment, e.g. for its gasification, and a most economical and clean way can be high temperature catalytic water steam reforming, and its high temperature heat as a by-product and its main product being   syngas (i.e. mix of hyd

Electronic Wrist Watch charged practically instantly Author: David Judbarovski, 79, systems engineering, principle inventor, retired judbarovski@gmail.com , Israel Ordinary, electronic wrist watch consumes about 50.0 mWh in a year. In my case, it is ordinary looked wrist watch with quartz pulse generation, alarm and LED lighting, can be equipped by a tiny Li-ion rechargeable battery of some tens milligram by weight. Being equipped additionally by conventional ultracapacitor of about 3.0 gram weigh (e.g. PHV-5R4H155-R), it allows to charge the watch practically instantly for about a month without new portion of charging being 4.0 mWh = 15.0 Joules Being ones in a month procedure, it can prolong the battery lifetime for many years and for ultracapacitor too, if being supposed their shelf live so long.   Two kinds of chargers are possible, the both can be small and light by weight: (1) an electrical one, or (2) powered by muscle force if being far from electricity s

Daewoo Shipbuilding & Marine Engineering Co., Ltd, South Korea Dear gentlemen! July 9, 2019 Please, permit me to present you a revolutionary fresh look on ships’ design. It allows a heavy warship of 75-150 km/h instead of ordinary 55 km/m with the same displacement and higher power. It allows a supertanker of your last design (30 km/h, so 14 days for 10.000 km long) to be substituted by single ship of 30 times less DWT, and 30 times quicker, about 120,000 kW, and sufficiently cheaper OPEX. It can be effective used for cheapest delivery: fresh agriculture products, oil, natural gas without its liquefying, other mass cargo for a long distance and up to 900 km/h, and as a military quick response.   Really: Surface ships’ and submarines’ power consume is proportional to cube of their speed V m/s (1) W ~ V^3 = k * V^3 * B (beam) * H (draft) (kW), while my concept’s power is proportional to the speed (2) W ~ V = V * H^2 * B (kW) Indeed: For that pur