A novel electrochemical sensing method based on CuN-T/GCE modified electrode was developed for the sensitive and selective determination of sunset yellow (SY) in sports drinks. The research offers several advantages over existing techniques, such as rapid response time, low cost, and ease of operation. The modified electrode exhibited enhanced electrocatalytic activity towards SY oxidation compared to the bare electrode, resulting in an increased peak current and a reduced potential difference. The linear range of the method was from 50 nM to 10 µM, with a detection limit of 13 nM (S/N = 3). The reproducibility of the method was demonstrated with a relative standard deviation of 3.31

High-spin states of Kr-77 are studied via the fusion-evaporation reaction Zn-68(O-16, 2p5n)Kr-77 with the beam energy of 80 MeV provided by the Tandem accelerator at Japan Atomic Energy Agency (JAEA). The intensity of the beam is I similar to 1 pnA. In the present work, some new gamma transitions are found to constitute the new band of the proposed level scheme. It is very similar to the M1 transition from the level energy, so it is proposed that this band is the M1 band.

Nitrite has been widely used in industrial and agricultural production and commonly exists in food, drinking water, organisms and the environment. However, nitrite is a toxic contaminant that can be very harmful to humans. In recent years, various methods for detecting nitrite have been developed, among which electrochemical methods are favored for their simplicity, rapidity, sensitivity and low price. In this paper, a graphene supported nano-PdCo alloy catalyst is proposed for the preparation of electrochemical nitrite sensor. The results show that the as-prepared sensor has a good electrocatalytic effect on the detection of nitrite. The electrochemical sensor can be adopted for rapid detection of nitrite with a wide range of 20~1050 μM and the low detection limit of 7.7 nM. The proposed sensor has been successfully applied to the detection of nitrite in pure water, with the recovery rate being 99.17% to 107.24%, which indicates that the sensor has good stability and reproducibility.

In this paper, we suggest a theoretical model for creating a two-dimensional (2D) electromagnetically induced phase grating in a five-level quantum system interacting with a weak probe light, two coupling standing light in the x and y directions and a Laguerre–Gaussian (LG) field. By derivation of the Maxwell’s wave equation, we obtain the dynamic response of the probe light in the quantum system. Then, we perform the analytical solution of the probe susceptibility for obtaining the linear and nonlinear properties of the medium. By numerical calculations, we discuss the amplitude and phase modulations and Fraunhofer diffraction patterns of the probe light in different parametric conditions. We show that by adjusting the orbital angular momentum (OAM) of the LG light a 2D grating is observed. Moreover, we find that the probe energy can be transferred from zero order to high order of direction when we change the OAM number of LG light. Our proposed model may have potential applications in fundamental research and quantum information processing based on OAM light in quantum systems.