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Intermodal four-wave mixing (FWM) in photonic waveguides offers a promising approach for efficient terahertz (THz) wave generation, crucial for advanced photonic systems. This study explores the potential of germanium (Ge) waveguides, leveraging their distinct dispersion profiles in transverse electric (TE), and transverse magnetic (TM) modes to achieve phase-matching for FWM. We conducted a numerical analysis of two waveguide geometries, ridge and plane, to optimize THz generation efficiency. Also, by optimizing waveguide geometry, it is possible to achieve higher conversion efficiency and broader THz bandwidth. The results demonstrate that Ge waveguides, particularly when utilizing same-phase laser pulses, can significantly enhance THz radiation and exhibit lower losses compared to traditional silicon-based designs. The findings suggest that integrating these optimized Ge waveguides with existing photonic components could lead to more versatile and efficient THz systems. [ABSTRACT FROM AUTHOR]

Background and aim: the aim of present study was evaluateSurvival and Technical Complication Rate of Partial and Full- Arch All- Ceramic Implant- Supported Fixed Dental Prostheses. Methods: From the electronic databases, PubMed, Scopus, LILACS, Web of Science, EBSCO, LIVIVO, and Embase have been used to perform a systematic literature over the last fiveyears between 2015 and 2021. Effect sizewith 95% confidence interval, random effect model and REMLmethod were calculated. The Meta analysis have been evaluated with the statistical software Stata/MP v.16 (The fastest version of Stata). Results: 372 studies (Partial FDPs (n=154) and Full-arch FDPs (n=218)) were selected to review the abstracts, the full text of 97 (Partial FDPs (n=45) and Full-arch FDPs (n=52)) studies was reviewed. Finally, seven studies were selected. Implant survival rate of Partial FDPs and Full-arch FDPs was 98% (ES, 98% 95 % CI 94%, 100%)and 98% (ES, 98% 95 % CI 95%, 100%), respectively. Overall Prosthesis survival rate of Partial FDPs and Full-arch FDPs was 97% (ES, 97% 95 % CI 94%, 100%). Conclusions: meta-analysis showed survival rate of implants and prostheses in Partial FDPs and Full-arch FDPs is high. The rate of technical complications for Partial FDPs and Full-arch FDPs was about 65%. [ABSTRACT FROM AUTHOR]

Recently, bottled water consumption has been increased in Iran, because of the priority change from tap water to bottled water usage; therefore, conducting studies on quality control of the bottled drinking waters seems very necessary. In this study, a comparison between the amounts of mineral elements present in 10 bottled water brands from the Kohgiluyeh-va-Boyer Ahmad Province market, SW Iran, and recommended limits by national and international standards and guidelines for drinking water was carried out, with the aim to assess the quality of bottled waters as an outdoor supply source for drinking water. The chosen bottled water brands were analyzed for more than 50 physicochemical parameters, using inductively coupled plasma optical emission spectrometry (ICP-OES), ionic chromatography (IC), hydride generation atomic absorption spectroscopy (HGAAS), spectrophotometry, titration, and conductometry standard methods. The comparison between obtained results and Iranian, United States Environmental Protection Agency (USEPA) and World Health Organization (WHO) standards and guidelines showed that all levels of analyzed parameters do not exceed the permitted limits, indicating that the bottled waters have safe quality for drinking use. Results revealed that bottled waters are a valid substitute of tap water, especially for outdoor drinking purpose. Nevertheless, the mineral elements such as Ca, Mg, Na, and K are not provided by the bottled waters in sufficient levels needed daily by human body. [ABSTRACT FROM AUTHOR]