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Design and Fabrication of a Low-Loss Microstrip Lowpass-Bandpass Diplexer for WiMAX Applications

China Communications 2020年第6期17卷 109-120页

作者： Leila Nouri salah yahya Abbas Rezaei Institute of Research and Development Duy Tan UniversityDa Nang 550000Vietnam Faculty of Electrical–Electronic Engineering Duy Tan UniversityDa Nang 550000Vietnam Department of Communication and Computer Engineering Cihan University-ErbilErbilKurdistan RegionIraq Department of Software Engineering Faculty of EngineeringKoya UniversityKoya KOY45Kurdistan RegionIraq Department of Electrical Engineering Kermanshah University of TechnologyKermanshahIran

This work presents a compact lowpass-bandpass microstrip diplexer with a novel *** consists of a lowpass filter integrated with a bandpass filter via a simple compact *** proposed bandpass filter consists of four rectangular patch cells and some thin *** step impedance structures,with a radial cell,are applied to achieve a lowpass frequency *** lowpass channel of the introduced diplexer has 2.64 GHz cut-off frequency,whereas,the bandpass channel center frequency is 3.73 GHz for WiMAX applications and covers the frequencies3.31 GHz to 4 *** addition to having novel structures,both filters have other advantages in terms of high return loss,low insertion loss and high *** presented microstrip diplexer has the compact size of 29 mm×13.8 mm×0.762 mm,calculated at 2.64 *** obtained insertion losses are 0.20 dB(for the first channel)and 0.25 dB(for the second channel),which make the proposed diplexer suitable for energy *** stopband properties of both bandpass and lowpass filters are improved by creating several transmission *** comparison results show that the lowest insertion losses,the minimum gap between channels,good return losses,and good isolation are obtained.

关键词： compact diplexer lowpass-bandpass low-loss microstrip selectivity

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Knowledge, Attitude, and Practice of Using Helmets in Children amongst Parents to Prevent Head Injuries: A Cross-Sectional Study in Riyadh, Saudi Arabia

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Open Journal of Pediatrics 2024年第2期14卷 255-265页

作者： Turki salah Aldeen Bukhari Abdullah yahya Aldhban Anas Abdulrahman Alqasem Dona Jamal Al Hatlani Hareth Aldosaimani Hamad A. Al Madi Khalid Alqahtani Prince Sultan Military Medical City Riyadh Saudi Arabia Emergency Department Disaster Medicine and Emergency Preparedness Prince Sultan Military Medical City Riyadh Saudi Arabia Emergency Department Asir Central Hospital Abha Saudi Arabia

Objectives: The primary objective was to characterize the range of Knowledge, Attitude, and Practice (KAP) of Helmet use in children amongst parents to prevent head injuries and death. Methods: This is a cross-sectional study, done by online survey using a snowball sampling technique, the number of included responses were 386 parents (Male and female) living in Riyadh Aged 21 - 60 years old or above. Results: The study showed that there is a difference in Parents’ belief in the importance of helmet use while riding a Bicycle vs Motorcycle/Quad bike and that was affected by parents’ education level, almost all the people who answered the survey (76.7%) agree that it is important for their children to wear a helmet when riding both a Bicycle and a Motorcycle or Quadbike with a cumulative percentage of (93.8%). And almost all agreed on multiple approaches to help increase helmet use be it by forcing rental shops to give out helmets, forcing sellers to recommend the use of helmets, increasing awareness campaigns, and imposing fines for not wearing helmets. Conclusions: This study is the first to explore Family helmet use while riding Bicycles and Motorcycles/Quad bikes. Although Parent’s belief in the importance of helmet use for their children was high, it is clear that the level of practice is low. With that the risk of head injuries might be high, our findings suggest that safety interventions for increasing pediatric helmet use are needed to increase helmet use and reduce the risk of head injury and hospitalization.

关键词： Head Trauma Head Injury Helmet Bicycle Motorcycle Quad Bike KAP Knowledge Attitude Practice

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