Structural Dynamics Analysis and Optimization of an Oil-Free Piston Air Compressor Based on Vibration and Noise Characteristics by Xiaoqing Sun, Yi Shen, Lai Yang, Huafang Liang

“…To address the broadband noise and vibration problems of a new oil-free piston air compressor, we developed a hybrid optimization method that combines experimental testing, theoretical evaluation, and numerical simulation. …”
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Perforated Duodenal Ulcer in a Young Nepalese Girl: An Infrequent Diagnosis for Age by Ashish Lal Shrestha, Anusha Shrestha

“…Clinical examination revealed florid peritonitis, and abdominal radiographs showed free peritoneal air. At emergency laparotomy, PDU was noted with general peritoneal contamination. …”
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Traumatic J-Pouch Perforation following a Blunt Abdominal Injury by Leonid Drober, David Hochstein, Hany Bahouth

“…Computed tomography showed free peritoneal air and fluid in the abdomen mandating an exploratory laparotomy. …”
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Diagnostic Colonoscopy Leading to Perforated Appendicitis: A Case Report and Systematic Literature Review by Daniel Paramythiotis, Konstantinia Kofina, Vasileios Papadopoulos, Antonios Michalopoulos

“…A 60-year-old female patient underwent a colonoscopy during the investigation of nontypical abdominal pain without pathologic findings. 24 hours after the examination she presented gradually increased right lower quadrant abdominal pain and a CT scan was performed, showing an inflammation of the appendiceal area with free peritoneal air. Through laparotomy, perforated appendicitis was diagnosed and an appendectomy was performed. …”
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Letter and Person Recognition in Freeform Air-Writing Using Machine Learning Algorithms by Huseyin Kunt, Zeki Yetgin, Furkan Gozukara, Turgay Celik

“…Unlike user authentication where person recognition depends on predefined content, such as a passcode or signature, person recognition here depends on the underlying writing style of the writer in free-form. The free-form air-writing indicates the user freedom to select any letter with any size (varying from a quarter to the full size of an A4 page) to write on the air. …”
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A satellite-based analysis of semi-direct effects of biomass burning aerosols on fog and low-cloud dissipation in the Namib Desert by A. Mass, A. Mass, H. Andersen, H. Andersen, J. Cermak, J. Cermak, P. Formenti, E. Pauli, E. Pauli, J. Quinting

“…BBAs are transported to the Namib along moist free-tropospheric air by a large-scale anticyclonic recirculation pattern. …”
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