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Efficient Electromagnetic Wave Absorption and Thermal Infrared Stealth in PVTMS@MWCNT Nano‑Aerogel via Abundant Nano‑Sized Cavities and Attenuation Interfaces

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Nano-Micro Letters 2024年第1期16卷 370-383页

作者： Haoyu Ma Maryam Fashandi Zeineb ben rejeb Xin Ming Yingjun Liu Pengjian Gong Guangxian Li Chul B.Park College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan University24 Yihuan RoadNanyiduanChengdu 610065SichuanPeople’s Republic of China Microcellular Plastics Manufacturing Laboratory Department of Mechanical and Industrial EngineeringUniversity of Toronto5 King’s College RoadTorontoON M5S 3G8Canada Jiangsu JITRI Advanced Polymer Materials Research Institute Tengfei Building88 Jiangmiao RoadJiangbei New DistrictNanjing 211800JiangsuPeople’s Republic of China MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringInternational Research Center for X PolymersZhejiang University38 Zheda RoadHangzhou 310027People’s Republic of China

Pre-polymerized vinyl trimethoxy silane(PVTMS)@MWCNT nano-aerogel system was constructed via radical polymerization,sol-gel transition and supercritical CO_(2)*** fabricated organic-inorganic hybrid PVTMS@MWCNT aerogel structure shows nano-pore size(30-40 nm),high specific surface area(559 m^(2)g^(−1)),high void fraction(91.7%)and enhanced mechanical property:(1)the nano-pore size is beneficial for efficiently blocking thermal conduction and thermal convection via Knudsen effect(beneficial for infrared(IR)stealth);(2)the heterogeneous interface was beneficial for IR reflection(beneficial for IR stealth)and MWCNT polarization loss(beneficial for electromagnetic wave(EMW)attenuation);(3)the high void fraction was beneficial for enhancing thermal insulation(beneficial for IR stealth)and EMW impedance match(beneficial for EMW attenuation).Guided by the above theoretical design strategy,PVTMS@MWCNT nano-aerogel shows superior EMW absorption property(cover all Ku-band)and thermal IR stealth property(ΔT reached 60.7℃).Followed by a facial combination of the above nano-aerogel with graphene film of high electrical conductivity,an extremely high electromagnetic interference shielding material(66.5 dB,2.06 mm thickness)with superior absorption performance of an average absorption-to-reflection(A/R)coefficient ratio of 25.4 and a low reflection bandwidth of 4.1 GHz(A/R ratio more than 10)was experimentally obtained in this work.

关键词： Nano-pore size Heterogeneous interface Electromagnetic wave absorption Thermal infrared stealth Nano-aerogel

Tunisian DREEM: Nursing Students’ Perception of the Learning Environment

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Open Journal of Nursing 2022年第11期12卷 745-757页

作者： rejeb Imen Samet Amal ben Amor Mouna Talbi Aziza Denguir Hichem Emergency Department University Hospital of Gabes Gabes Tunisia Faculty of Medicine University of Sfax Sfax Tunisia Cardiology Department University Hospital of Gabes Gabes Tunisia

Objectives: The evaluation of the learning environment has become critical to professional development and student success. This study aims to evaluate the viewpoints of nursing sciences students on the learning environment using the Dundee Ready Education Environment Measure (DREEM) at a Higher Institute of Nursing Sciences in Tunisia. Methods: A descriptive cross-sectional study was performed on 200 students at the Higher Institute of Nursing Sciences. The Dundee Ready Education Environment Measure was used as a worldwide tool. Descriptive statistics and one-way analysis of variance with a post hoc Tukey-Kramer multiple comparisons test were used for data analysis. Results: The total mean score on the 50-item DREEM inventory was 111.9 out of a maximum of 200. Students’ perceptions of learning, their teachers, their academic self, and of the atmosphere were more positive than negative. Student social self-perception was negatively evaluated. Students were not satisfied with the support system in the institute. The DREEM score was significantly higher for the students in the first year of study (P Conclusion: This is the first study in Tunisia assessing the nursing learning environment;it showed a positive assessment. Therefore, improvements are required, especially in the learning and social domains of the educational environment.

关键词： Perception Learning Environment Nursing Student DREEM Tunisia

A Complex Interrelationship between Rectal Temperature and Dairy Cows’ Performance under Heat Stress Conditions

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Open Journal of Animal Sciences 2016年第1期6卷 24-30页

作者： Meriem rejeb Raoudha Sadraoui Taha Najar Moncef ben M’rad National Agronomic Institute in Tunis Animal Production Department University of Carthage Tunis Tunis Tunisia

Upper limit of thermal stability and subsequent rise of thermoregulatory functions are affected by body temperature. This study was designed to determine the effects of rectal temperature (RT) on dairy cows’ performance (heart rates (HR), respiratory rates (RR), milk yield (MY), dry matter intake (DMI), digestibility, plasma concentration of vitamin C under hot climate. This study was carried out in 2009, in north-west of Tunisia using 30 Holstein cows in mid lactation. The experiment was performed in spring (15th of February-15th of March: P1) and summer (1st-30th of August: P2). On each test day, temperature-humidity index (THI), RT, HR, RR, MY, DMI, digestibility and plasma VC concentration were determined. All this parameters were affected (P 2 and r (correlation coefficient) of the regressions. R2 in regressions on RT (R2 (RT, DMI) = 0.92 (P 2 (RT, MY) = 0.91 (P 2 in regressions on THI (R2 (THI, DMI) = 0.76 (P 2 (THI, MY) = 0.63 (P 2 in regressions on RT confirms that rectal temperature constitutes a larger component of total variance of responses in dairy cows to hot environmental temperature.

关键词： Heat Stress Rectal Temperature Dairy Cows Temperature-Humidity Index

prévention des blessures sportives:quelle place pour l’intervention psychologique?

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prévention des blessures sportives:quelle place pour l’int...

Role of Coelioscopy in the Etiologic Diagnosis of Exudative Ascites of Unknown Origin of the Women

第8届全国运动心理学学术会议

作者： nadia gaoua-jari riadh ben rejeb mokhtar chtara Centre National de la Médecine et des Sciences du sport

＜正＞Objectifs:Le but de cette étude était de déterminer l’impact de certains facteurs psychologiques sur l’apparition de blessures sportives chez les athlètes d’élite Tunisiens.

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Journal of Cancer Therapy 2015年第5期6卷 466-471页

作者： Mohamed ben Mabrouk Aida ben Slama Trabelsi Mohamed ben rejeb Hanène Jaziri Mehdi Ksiaa Sassi Bouguizane Badreddine Sriha Ali Jmaa Ali ben Ali Department of Digestive Surgery Sahloul Hospital Sousse Tunisia Department of Gastroenterology Sahloul Hospital Sousse Tunisia Department of Preventive Medicine Sahloul Hospital Sousse Tunisia Department of Gynecology Farhat Hached Hospital Sousse Tunisia Department of Pathology Farhat Hached Hospital Sousse Tunisia

Introduction: The aim of this study was to clarify the role of laparoscopy in the etiological diagnosis of exudative ascites of unknown origin in women. Materials and Methods: This?was?a prospective study from 2007 to 2012, including 83 women with exudative ascites of unknown origin and had a laparoscopy diagnostic purpose. Results: Carcinomatosis and peritoneal tuberculosis were the two most common causes found in 31% (26 cases) and 66% (55 cases) of cases respectively. The average age of the patients was 56 years. Weight loss and abdominal pain were the most frequent, observed symptoms in 71 cases (85.5%) and 53 cases (63.8%) respectively. The CT scan abnormalities noted?were a peritoneal thickening in 32 cases (38.5%), peritoneal nodules in 15 cases (18%), and agglutination of the digestive handles in 12 cases (14.4%). Laparoscopic Visual diagnosis was in favor of a peritoneal carcinomatosis in 32 cases (38.5%), peritoneal tuberculosis in 45 cases (54.2%), and non specific infection in 6 cases (7.3%). The histological diagnosis was a peritoneal carcinomatosis in 26 cases (31%), and peritoneal tuberculosis in 55 cases (66%). The positive predictive value of laparoscopic vision Diagnostics in Peritoneal tuberculosis was 100% and the negative predictive value was 73.7%. In peritoneal carcinomatosis, the positive predictive value was 81.3% and the negative predictive value was 100%. Conclusion: The etiologic diagnosis of exudative ascites in women is difficult despite the availability of several tests. Currently, laparoscopy with peritoneal biopsy remains the gold standard for etiologic diagnosis.

关键词： Ascites Exudative Laparoscopy Peritoneal Tuberculosis Peritoneal Carcinomatosis

Wegener’s Granulomatosis Presenting with Bilateral Excavated Nodules

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Open Journal of Pathology 2012年第2期2卷 26-28页

作者： Emna Braham Hajer Racil Houda ben rejeb Moncef Hamdane Abdellatif Chabou Faouzi El Mezni Department of Pathology Abderrahmen Mami Hospital Ariana Tunisia Department of Pneumology Abderrahmen Mami Hospital Ariana Tunisia

Wegener’s granulomatosis (WG) is a systemic inflammatory disease whose histopathologic features often include necrosis, granuloma formation, and vasculitis of small-to-medium-sized vessels. We report a new case of Wegener’s granulomatosis occurring in a 41-year-old man who was admitted for respiratory symptoms, fever, asthenia, night sweats and weight loss since one month. Chest X-ray and computed tomography showed multiple bilateral pulmonary excavated lesions. A trransparietal lung biopsy was performed. Histological examination showed an area of necrosis, surrounded by a palisade of histiocytes. Some of the histiocytes were multinucleated and formed true granulomas within the wall of the adjacent pulmonary artery. Serology was strongly positive for ANCA. A diagnosis of Wegener granulomatosis was conducted and the patient was started on cyclophosphamide and methylprednisolone as an initial treatment, with a favorable evolution.

关键词： Vasculitis Wegener Pathology Lung Granulomatous Inflammation

Children Flat Foot and Lower Limb Rotational Profile: A Cross-Sectional Descriptive Study

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Open Journal of Orthopedics 2015年第10期5卷 326-335页

作者： Jemni Sonia Lazreg Nadia Abid Manel Frioui Samia ben rejeb Mohamed Osman Walid Zaoui Afif Khachnaoui Faycel Department of Physical Therapy and Rehabilitation Sahloul Hospital Sousse Tunisia High School of Sciences and Technology of Health of Sousse Sousse Tunisia Community and Preventive Medicine Department Sahloul Hospital Sousse Tunisia Orthopedic Department Sahloul Hospital Sousse Tunisia

Flat foot in children is a common deformation, which appears during the first years of life. It requires a rigorous evaluation to rule out congenital or neurological abnormality. It is characterized by a decrease of the plantar concavity indeed collapse of the foot, often associated with other morphostatic deformations. The aim of this study is to find a correlation between the essential flat foot in children and lower limb disorders torsional. It is a cross-sectional descriptive study, recruiting 110 children (220 feet) aged between 3 and 6 years old. Each child was given an assessment of the morphology of the foot (Contact Index II…) and lower limb rotational profile (intoeing and femoral antétorsion and tibal torsion). Among 110 children, 21 (19.1%) have bilateral flat feet and 7 (6.4%) have unilateral flat feet, associated with an average value of Contact Index II equal to 0.921;the minimum value is 0.880 and the maximum value is 1.17. All children with flat feet have excessive femoral antétorsion;45 (92%) are associated with a hip intoeing and 38 (80%) present an insufficient external tibial torsion. The analysis of multiple regression shows a significantly elevated correlation among the flat foot and excessive internal rotation of the hip (F = 70.36, r = 0.77, P < 0.001), excessive femoral antetorsion (F = 54.78, r = 0.73, P < 0.001) and insufficient external tibial torsion (F = 7.79, r = 0.37, P < 0.001).

关键词： Children Essential Flat Foot Femoral Antétorsion Internal Rotation of the Hip Tibial Torsion