2results about How to "Reduce freshness" patented technology

The utility model relates to the technical field of box wallboard, disclose a kind of box wallboard structure of high efficiency prevents cold bridge, including refrigeration box, and refrigeration box two sides symmetry are provided with wallboard, and wallboard includes veneer, and fill slot is opened in veneer, and heat preservation board is provided in veneer, and inner layer soft board is provided on veneer, and hollow layer is provided between heat preservation board and inner layer soft board, and hollow layer is filled with argon, and heat insulation in refrigeration box can be realized using heat preservation board, and hollow layer is arranged between inner layer soft board and heat preservation board, when pork impacts inner layer soft board, inner layer soft board will be appropriately deformed, while argon in hollow layer will be compressed, and then the impact force brought by pork impacting inner layer soft board is consumed, while argon is lower than air heat conduction coefficient, to further improve the temperature insulation effect of box wallboard, avoid the heat conduction path at its fracture after heat preservation layer fracture, and then cold bridge appears, improve the refrigeration effect of the pork transported, and guarantee the freshness of pork.

The invention relates to the technical field of Internet of Things wireless communication, in particular to an information age minimization method and device for an opportunistic channel access system, the system comprises a base station and N Internet of Things devices, and the method comprises the following steps: each active device competes for a channel access right in a discrete time slot with a competition probability p; the winning device evaluates the channel gain and calculates the unloading rate, and decides whether to access according to the comparison with an unloading rate threshold r; the accessed equipment unloads data to the base station; the base station calculates the average information age in the observation period; and p and r optimized by a hierarchical iteration solving algorithm are fed back to each piece of Internet of Things equipment. Through joint optimization of two parameters and combination of an opportunity channel access mechanism, the defects that information freshness is insufficient and a non-convex problem is difficult to solve are overcome, the channel utilization efficiency is improved, and the method is suitable for a multi-device real-time data transmission scene.