L黚ao slow-release water-fertilizer-nutrition agent (LSWA) is a new and proven highly effective soil additive. This nutrient absorbent polymer dramatically conserves water and reduces fertilizer usage
The biggest barrier for photovoltaic (PV) utilization is its high cost, so the key for scale PV utiliza-tion is to further decrease the cost of solar cells. One
A measurement system was developed to measure the electron beam spectrum of the Beijing free-electron laser based on the optical transition radiation (OTR). Thi