Technology progress and institutional investors

Lepton pair decays of theKLmeson in the light-front model

“…(3.27) do not agree with the recent global fitted value ofρ = 0.224 ± 0.038 [36,42], which may not be unexpected since (i) we have not included various possible ranges ofm t (m t ), |V cb |, and quark masses in the calculation and (ii) we still need to fix n in Eq. (3.2) and modify the form of C W (q 2 ) [43]. However, the important message here is that the LD dispersive contribution in K L → µ + µ − is calculable in the LFQA.…”

“…For K L → µ + µ − , we have demonstrated that the long-distance dispersive contribution is possibly small. However, to get a meaningful constraint on the CKM parameters, further theoretical studies [43] as well as more precise experimental data such as those from NA48 at CERN [33] on the spectra of the pair decays are needed. Finally, we remark that our approach cannot calculate the absolute decay widths of K L → l + l − γ and K L → γγ.…”

Design of an all-weather water extraction system based on solar energy and diurnal temperature difference

“…The amount of fresh water on the earth is only 2.53% of the total global water, of which 68.7% is solid glaciers, which are located in high mountains and polar regions that are difficult to use, and some of the freshwaters are buried deep underground and difficult to extract. With the deteriorating environment, these freshwater resources are becoming more and more scarce, especially in arid and island areas [1,2].…”

“…It should be noted that the water extraction system is affected by the local weather, humidity, the size of the diurnal temperature difference, and other related factors, and is a typical multiple linear regression model problem, so the daily water production is not yet the same. It has been experimentally verified that the greater the diurnal temperature difference, the lower the degree of barometric pressure variation, and the higher the humidity at the location of the system installation, the higher the water production and storage efficiency [8,9]. From the social and economic point of view, the device can reduce the economic losses and energy losses in the process of inter-basin water transfer implemented in China to solve water resources problems, including the cost of transportation and use of energy, time costs, water supply costs, etc.…”