No abstract

A miniaturized, triple-band, implantable antenna for biomedical applications is presented in this paper. The proposed antenna with dimensions of 8.1 mm × 8.1 mm × 0.64 mm, combined with a shorting pin and a ground slot, operates at bands between 401–406 MHz for the medical implant communications service (MICS); 1,395–1,400 MHz and 1,427–1,432 MHz for the wireless medical telemetry service (WMTS); and 2,400–2,500 MHz for industrial, scientific, and medical (ISM) applications. The antenna is deployed simultaneously for data transmission and wireless power transfer (WPT) at the two frequencies of communications and the ISM band, respectively. The antenna achieves peak gain values of -35.7 dBi, -25.1 dBi, and -19.5 dBi with the impedance bandwidths of 10.1%, 15.5%, and 9.58% at 402 MHz, 1.4 GHz, and 2.45 GHz, respectively. The experiments in the muscle tissue were implemented to demonstrate the reliability of the proposed antenna. To ensure safety standards in the human body environment, the specific absorption rate (SAR) value is simulated and evaluated thoroughly.

No abstract

Rhodium catalyst systems for hydroformylation has been researched widely in the literature. Using ionic liquid for rhodium-supported catalyst facilitates this reaction. In this work, TiO2 support was first time used. From the FT-IR, EPR, and surface area analysis, the components of supported ionic liquid phase can be seen after the impregnation of ionic liquid into the support’s porous structure. The main product for the ethylene conversion is propan-2-ol, as a subsequent hydrogenation product after hydroformylation. Pressure and temperature difference are evaluated to understand the influence on selectivity and product formation.

Isocyanate is a common name for chemical compounds containing one or more - NCO groups. There have been many studies showing that isocyanates pose a risk to human health when exposed and can cause occupational poisoning. When absorbed into the body, the isocyanates will be converted into the corresponding amines. Therefore, the determination of these diamines in urine will contribute to the assessment of exposure to isocyanates. This article presents a study on simultaneous determination of 4,4′-methylenedianiline (MDA), hexamethylene diamine (HDA), isophoron diamine (IPDA) in urine by liquid chromatography-tandem mass spectrometry (LC-MS/MS). The method detection limit (MDL) were 0.074, 0.059, and 0.053 ng/mL for HDA, MDA, IPDA, respectively. The method quantitation limit (MQL) were 0.243, 0.194 and 0.177 ng/mL for HDA, MDA, IPDA, respectively. The method's recovery ranged from 86.38 to 105.3% with the repeatability RSDr < 6%. The method was successfully applied to simultaneously determine the content of HDA, MDA and IPDA in 30 urine samples of workers at auto repair garages in Bac Ninh province. The results showed that HDA, MDA and IPDA were detected in these samples with different concentrations.