Anchor Bolt Design

hi..

right now we have job to design the steel tank that using anchor bolt type M24,M32 & M 42 but we doesnt have the specification about that ( the lenght detail dimension and the allowable tensile, please help us

best regard

Noise Standard

Maximum noise levels at any location

an employee can reasonably be expected to occupy while

carrying out normal process or mechanical work functions shall not exceed 115 dBA at any time. Is this a "reasonably" noise level for a welding shop? Wich one is the noise standard in Europe?

Another step towards inexpensive hydrogen production from sunlight

Solar-powered splitting of water promises an attractive, clean energy source and numerous research projects around the world are working on making this process sufficiently efficient - reducing the systems' cost and extending their lifetimes - to be able to compete with dirty carbon fuels on an industrial scale. Natural photosynthesis uses chlorophyll to absorbe visible light and many solar hydrogen cells are imitating this process by using light-sensitive organic dye molecules as light absorbers and then transfer the absorbed energy to a catalyst that reduces protons to hydrogen. Researchers in the UK have now shown that an inexpensive and environmentally benign inorganic light harvesting nanocrystal array can be combined with a low-cost electrocatalyst that contains abundant elements to fabricate an inexpensive and stable system for photoelectrochemical hydrogen production.