THE REQUIRED ACOUSTIC PARAMETERS SIMPLIFICATION OF INVISIBILITY CLOAKS AND CONCENTRATORS USING THE IMPEDANCE-TUNABLE COORDINATE TRANSFORMATION

The required acoustic parameters simplification of invisibility cloaks and concentrators using the impedance-tunable coordinate transformation

Abstract Transformation acoustics, as an unconventional theory, provides a powerful tool to design various kinds of acoustic devices with excellent functionalities.However, the required ideal parameters, which are prescribed by the method, are both complex and hard to implement-even using acoustic metamaterials.Furthermore, simplified parameter mat

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Dermatological Problems of Brachycephalic Dogs

Brachycephalic dogs are not only affected by brachycephalic Skincare and Hygiene Products obstructive airway syndrome (BOAS), but are also frequently referred to veterinary dermatologists for skin conditions, with English bulldogs and pugs particularly over-represented.Some skin diseases, such as skin fold dermatitis, are directly associated with t

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Non-fatal drug overdose among persons who inject drugs during first two years of the COVID-19 pandemic in New York City: Prevalence, risk factors

Background: We examined non-fatal drug overdoses during the COVID-19 pandemic among persons who inject drugs (PWID) in New York City (NYC).Methods: We recruited 275 PWID through respondent driven sampling and staff outreach from Oct.2021-Sept.2022 and enrolled in a cross-sectional survey.Information was collected on demographics, drug use behaviors

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Acute Diacetylmorphine (Heroin) Intoxication (Review)

This review Læbebalsam presents current data on the mechanism of action, selective toxicity, toxicokinetics and toxicodynamics of diacetylmorphine (heroin).Acute diacetylmorphine poisoning is considered under taking into account the developing a critical state, in which the poisoning severity is determined by severe metabolic disorders associated

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