Unlabelled: Forensic medical examination of the body of a dead person found in water gives the expert an additional task to determine the duration of his stay in the water. The answer to this question is of fundamental significance for the investigative authorities, since a dead person could have been submerged in the water to conceal the crime.
Objective: Objectification of experts' conclusions about the duration of corpse's stay in the water on indicators of dispersion of electrical conductivity of its skin.
Material And Methods: Research aimed at objectifying the conclusions of experts about the duration of corpse's stay in the water on the indicators of dispersion of electrical conductivity of its skin was conducted using the experimental material from the corpses of 68 persons of different sex and age, who died for different reasons.
Results: Three temperature ranges (1-24, 25-30, 31-40 °C) have been identified on the basis of regression analysis and mathematical models, describing the dynamics of electrical conductivity dispersion coefficient change depending on the duration of corpse's skin contact with the water of specified temperatures, have been created.
Conclusion: Formulas for calculating the period of interest for the researcher have been developed and the boundaries of confidence intervals for each temperature range have been determined, taking into account its diagnostic applicability. A computer program has been written to facilitate routine calculations on the proposed method in order to simplify the practical application of the suggested procedure.
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http://dx.doi.org/10.17116/sudmed20246705124 | DOI Listing |
Soft Matter
January 2025
Department of Mathematics, National Institute of Technology Durgapur, Durgapur-713209, India.
The present article deals with the modulation of oscillatory electroosmotic flow (EOF) and solute dispersion across a nanochannel filled with an electrolyte solution surrounded by a layer of a dielectric liquid. The dielectric permittivity of the liquid layer adjacent to supporting rigid walls is taken to be lower than that of the electrolyte solution. Besides, the aforesaid liquid layer may bear additional mobile charges, , free lipid molecules, charged surfactant molecules , which in turn lead to a nonzero charge along the liquid-liquid interface.
View Article and Find Full Text PDFPhys Chem Chem Phys
January 2025
School of Sciences, Beihua University, Jilin 132013, China.
The search for new anode materials with high lithium-ion battery (LIB) capacity has attracted considerable attention due to the increasing need for electrical power. Here, we utilized first-principles calculations to develop a honeycomb-structured BCN monolayer, which exhibits an ultra-high Li-ion storage capacity of 2244 mA h g as an anode material for LIBs. Furthermore, the calculations show that the BCN monolayer has a comparatively small diffusion barrier of 0.
View Article and Find Full Text PDFACS Nano
January 2025
School of Physics and Astronomy, Monash University, Clayton, Victoria 3800, Australia.
Van der Waals electrode integration is a promising strategy to create nearly perfect interfaces between metals and 2D materials, with advantages such as eliminating Fermi-level pinning and reducing contact resistance. However, the lack of a simple, generalizable pick-and-place transfer technology has greatly hampered the wide use of this technique. We demonstrate the pick-and-place transfer of prefabricated electrodes from reusable polished hydrogenated diamond substrates without the use of any sacrificial layers due to the inherent low-energy and dangling-bond-free nature of the hydrogenated diamond surface.
View Article and Find Full Text PDFRSC Adv
January 2025
Department of Electrical Engineering and Electronics, University of Liverpool Brownlow Hill Liverpool L69 3GJ UK
In response to the demand for epoxy-based dielectric substrates with low dielectric loss in high-frequency and high-speed signal transmission applications, this study presents a surface-engineered filler material. Utilizing ball-milling, surface-modified aluminum flakes containing organic (stearic acid) and inorganic (aluminum oxide) coatings are developed. Incorporation of the filler into the epoxy matrix results in a significant increase in dielectric permittivity, by nearly 5 times (from 4.
View Article and Find Full Text PDFACS Mater Au
January 2025
Department of Electrical and Electronic Engineering, Kyushu Institute of Technology, 1-1 Sensuicho, Tobataku, Kitakyushu, Fukuoka 804-8550, Japan.
Ionic gels (IGs), ionic liquids (ILs) dispersed in polymers, exhibit extremely low vapor pressure, electrochemical and thermal stability, and excellent mechanical characteristics; therefore, they are used for fabricating stretchable sensors, electrochemical transistors, and energy storage devices. Although such characteristics are promising for flexible and stretchable electronics, the mechanical stress-induced ruptured covalent bonds forming polymer networks cannot recover owing to the irreversible interaction between the bonds. Physical cross-linking via noncovalent bonds enables the interaction of polymers and ILs to form supramolecular IGs (SIGs), which exhibit favorable characteristics for wearable devices that conventional IGs with noncovalent bonds cannot achieve.
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