TiNi-based shape memory alloys have been extensively investigated due to their significant applications, but a comprehensive understanding of the evolution of electronic structure and electrical transport in a system with martensitic transformations (MT) is still lacking. In this work, we focused on the electronic transport behavior of three phases in Ni$_{50-x}$Fe$_{x}$Ti$_{50}$ across the MT. A phase diagram of Ni$_{50-x}$Fe$_{x}$Ti$_{50}$ was established based on x-ray diffraction, calorimetric, magnetic, and electrical measurements. To reveal the driving force of MT, phonon softening was revealed using first-principles calculations. Notably, the transverse and longitudinal transport behavior changed significantly across the phase transition, which can be attributed to the reconstruction of electronic structures. This work promotes the understanding of phase transitions and demonstrates the sensitivity of electron transport to phase transition.

This paper analyzes the research progress of remote sensing technology in lake water environment monitoring in China in recent years, including the research progress of suspended matter concentration in water, the research progress of bloom characteristics and the research status of chlorophyll concentration A.Although great progress has been made in lake water environment monitoring, the use of remote sensing to capture the spectral characteristics of water remains to be strengthened. It is necessary to improve the lake remote sensing algorithm for long time series and large range.

The behavior of quantum dots (QDs) in penetration into cell nuclei is investigated. It is discovered that the combination of an organic fluorophore staining the nuclei and UV irradiation can cause QDs of certain size or surface modifications to be trapped inside the cell nuclei. These findings not only provide new insights for intracellular transportation of nanoparticles but also create unique opportunities for labeling biological events inside cell nuclei.

The advances in polarographic catalytic wave of organic compound in the presence of oxidant are reviewed with 62 references. The classification and name of the catalytic wave are proposed as follows: (1) the parallel catalytic wave, which includes the parallel catalytic wave, the induced adsorption-parallel catalytic wave and the association-parallel catalytic wave. (2) the parallel catalytic hydrogen wave, which includes the parallel catalytic hydrogen wave and the association-parallel catalytic hydrogen wave. The polarographic catalytic waves of organic compounds, such as protein, flavone, steroide, quinone, α, β-unsaturated carbonyl compound, nitrogen-containing substances and charged surfactants, and their application are briefly introduced.

A method for the determination of menadione was proposed. In 0.2 mol/L HOAc-NaOAc (pH 4.7) buffer solution containing 4.0 x 10(-3) mol/L KIO3, menadione yields a well-defined polarographic catalytic wave with a peak potential of -0.95 V (vs. SCE). The second order derivative peak current is linearly proportional to the menadione concentration in the range of 4.0 x 10(-8) -2.0 x 10(-6) mol/L with the correlation coefficient of 0.999 (n=8). The detection limit is 2.0 x 10(-8) mol/L. The sensitivity of the catalytic wave is 10 times higher than that of the corresponding reduction wave in the absence of KIO3. The proposed method was used to directly determine the menadione contents in clinical injections in good agreement with the labeled amount without preseparation. The mechanism of polarographic catalytic wave of menadione was discussed. The polarographic reduction wave of menadione itself in the acetate buffer solution is ascribed to that the carbonyl group of menadione is reduced in consecutive two electrons and two protons addition to hydroquinone via semiquinone (quinone-hydroquinone) free radical intermediates. In the presence of KIO3, the carbonyl group of menadione is chemically regenerated due to oxidation of semiquinone free radical intermediates by KIO3 and a series of its derived species formed during six-electron successive reduction process. The maximum current of the first charge transfer is enhanced, and the second electroreduction step of menadione is inhibited.