检索结果-南通市图书馆

Lateral ring compression test applied to a small caliber steel jacket:Identification of a constitutive model

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2024年第6期36卷 133-148页

作者： yann Coget Yael Demarty Christophe Czarnota Anthony Bracq Jean-Sebastien Brest Alexis Rusinek French-German Research Institute of Saint-Louis 5 Rue Du General Cassagnou68300 Saint-LouisFrance Laboratoire d'Etude des Microstructures et de Mecanique des Materiaux(LEM3) CNRSUniversite de LorraineArts&Metiers ParisTechF-57000 MetzFrance

The evolution of threats and scenarios requires continuous performance improvements of ballistic protections for armed *** a modeling point of view,it is necessary to use sufficiently precise material behavior models to accurately describe the phenomena observed during the impact of a projectile on a protective *** this context,the goal of this paper is to characterize the behavior of a small caliber steel jacket by combining experimental and numerical *** experimental method is based on the lateral compression of ring specimens directly machined from the thin and small *** speeds and temperatures are considered in a quasi-static regime in order to reveal the strain rate and temperature dependencies of the tested *** Finite Element Updating Method(FEMU)is *** results are coupled with an inverse optimization method and a finite element numerical model in order to determine the parameters of a constitutive model representative of the jacket *** of the present model are verified against experimental results and a parametric study as well as a discussion on the identified material parameters are *** results indicate that the strain hardening parameter can be neglected and the behavior of the thin steel jacket can be described by a modeling without strain hardening sensitivity.

关键词： Full metal jacket ammunition Lateral ring compression Inverse identification Numerical simulation

Association of the immediate perioperative dynamics of circulating DNA levels and neutrophil extracellular traps formation in cancer patients

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Precision Clinical Medicine 2024年第2期7卷 93-108页

作者： Andrei Kudriavtsev Brice Pastor Alexia Mirandola Ekaterina Pisareva yann Gricourt Xavier Capdevila Alain R.Thierry Philippe Cuvillon Institut de Recherche en Cancerologie de Montpellier INSERM U1194Universite de MontpellierMontpellier 34298France Institut regional du Cancer de Montpellier Montpellier 34298France Department of Anaesthesiology and Pain Management Centre Hospitalo-Universitaire(CHU)CaremeauPlace du Professeur DebreNimes 30400France University of Montpellier Montpellier 34298France Division of Anaesthesia Intensive Care Pain and Emergency MedicineMontpellier University HospitalMontpellier 34090France Montpellier NeuroSciences Institute INSERMU1298University of MontpellierMontpellier 34295Franc

Objectives:Elevated circulating DNA(cirDNA)concentrations were found to be associated with trauma or tissue damage which suggests involvement of inflammation or cell death in post-operative cirDNA *** carried out the first prospective,multicenter study of the dynamics of cirDNA and neutrophil extracellular trap(NETs)markers during the perioperative period from 24 h before surgery up to 72 h after curative surgery in cancer ***:We examined the plasma levels of two NETs protein markers[myeloperoxidase(MPO)and neutrophil elastase(NE)],as well as levels of cirDNA of nuclear(cir-nDNA)and mitochondrial(cir-mtDNA)origin in 29 colon,prostate,and breast cancer patients and in 114 healthy individuals(HI).Results:The synergistic analytical information provided by these markers revealed that:(i)NETs formation contributes to post-surgery conditions;(i)post-surgery cir-nDNA levels were highly associated with NE and MPO in colon cancer[r=0.60(P<0.001)and r=0.53(P<0.01),respectivelyl,but not in prostate and breast cancer;(i)each tumor type shows a specific pattern of cir-nDNA and NETs marker dynamics,but overall the pre-and post-surgery median values of cir-nDNA,NE,and MPO were significantly higher in cancer patients than in ***:Taken as a whole,our work reveals the association of NETs formation with the elevated cir-nDNA release during a cancer patient's perioperative period,depending on surgical procedure or cancer *** contrast,cir-mtDNA is poorly associated with NETs formation in the studied perioperative period,which would appear to indicate a different mechanism of release or suggest mitochondrial dysfunction.

关键词： circulating DNA perioperative period neutrophil extracellular traps neutrophil elastase myeloperoxidase minimal residualdisease

Physicochemical and Thermal Properties of Some Key Tropical Sawdust Woods for Energy Production

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Sustainable Bioenergy Systems 2024年第1期14卷 1-22页

作者： Davy Fiwa Kaoke yann Le Brech Emmanuel Talla Anthony Dufour Patrick Mountapmbeme Kouotou Department of Chemical Engineering School of Chemical Engineering and Mineral Industries University of Ngaoundere Ngaoundere Cameroon National Advanced School of Engineering of Maroua University of Maroua Maroua Cameroon Laboratory of Reactions and Process Engineering University of Lorraine-France Nancy France Higher Institute of Agriculture Wood Water and Environment University of Ebolowa Ebolowa Cameroon

In South Saharan countries, 85% of the population uses biomass as a primary energy source. Cameroon presents one of the highest biomass energy and sawmills produce important sawdust resources which are not used and are burnt in piles leading to significant air toxic emissions. Therefore, we have to valorize industrially these available sawdusts. This study focuses on the physicochemical and thermochemical analysis of Ayous, Sapelli and Tali sawdust. The proximate and ultimate analysis, particle size, structural composition, as well as heavy metal content and calorific value were determined. In addition, the thermogravimetric mass losses were also estimated. The results showed that high water contents (24% - 41%) were recorded in the raw sawdust, and the thermal treatment reduced these contents from 78% to values in the range of 4% - 9%. The values for ash and volatile matter content were respectively between 0.25% - 0.74% and 68% - 76%. The LHV is higher in Ayous (17.5 MJ/kg) and Sapelli (16.8 MJ/kg) than that of Tali (15.7 MJ/kg). The concentration of heavy metals is very low in each species. Extractives are more present in Tali (16.06%) than in the other sawdusts. Pyrolysis of sawdust shows the typical decomposition of hemicellulose (270˚C - 325˚C), cellulose (325˚C - 400˚C) and lignin (200˚C - 550˚C) with a maximum loss of 75% at 370˚C and the melting point is 320˚C. The results of the sawdust parameters determined in the paper can be valorized to reduce pollutants emissions by developing the efficiency and effectiveness of biomass energy processes and promoting the use of biomass as a sustainable alternative to traditional fossil fuels.

关键词： Wood Sawmills Sawdust Combustion Energy

Thermophysical, Mechanical and Durability Characterization of Adobe Bricks Reinforced with Fonio (Digitaria exilis) Sounds

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Materials Physics and Chemistry 2024年第8期14卷 146-164页

作者： Colbert Babé Etienne yanné Souaibou Mojonda Lémankréo Bakaiyang Bernard Kola Gustave Assoualaye Layndé Tawé Raidandi Danwé Dieudonné Kidmo Kaoga Noël Djongyang Department of Renewable Energy National Advanced School of Engineering of Maroua University of Maroua Maroua Cameroon Department of Civil Engineering and Architecture National Advanced School of Engineering of Maroua University of Maroua Maroua Cameroon University Institute of Wood Technology University of Yaound I Yaound Cameroon Energy Rsearch Laboratory Institute of Geological and Mining Research Yaound Cameroon

Buildings constructed using modern materials such as cement are energy-intensive, facilitate heat transfer and thus promote warming inside the building. However, the Sudano-Sahelian regions have a hot climate occupying a large period of the year, thus requiring not only sustainable construction materials, but also which provide thermal comfort in the building by limiting the energy demand for air conditioning. These qualifications are important for sub-Saharan African countries in general and those of the Sudano-Sahelian zone in particular, which need ecological materials with good thermal performance to limit heating inside buildings. This study is an energy recovery of agricultural waste in buildings with a view to offering the populations of the northern regions of Cameroon suitable materials at lower cost for the construction of buildings. The soil used for this study was extracted from the locality of Yagoua where the populations make abundant use of mud bricks. Fonio waste was incorporated at low levels into the earth bricks, particularly at 0%, 1%, 2%, 3%, and 4%, with a view to strengthening their thermophysical and mechanical properties. The results obtained indicate that earth bricks reinforced with 4% waste showed better thermal and mechanical insulation properties compared to other formulations with an improvement of 16% and 78% respectively compared to the unreinforced samples. This research allows us to conclude that fonio waste can be used practically without expense in the building with a view to its energy recovery and will promote not only thermal comfort and the limitation of the energy supply for air conditioning, but the construction of more sustainable buildings with a cleaner environment.

关键词： Durability Thermal Comfort Building Soil Fonio Faste

Breast Cancer in a Supernumerary Breast at the Yaoundé Gynaeco-Obstetric and Paediatric Hospital: About a Case

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Breast Cancer Research 2024年第3期13卷 43-48页

作者： Michel Auguste Mouelle Sarah Gaëlle Adiang Esther Meka Isidore Tompeen Christelle Djapa Claude Hector Mbia yann Eng Julius Sama Dohbit Zacharie Sando Oncology Department of the Yaound Gynaeco-Obstetric and Paediatric Hospital Yaound Cameroon Faculty of Medicine and Biomedical Sciences of Yaound University of Yaound I Yaound Cameroon Obstetrics and Gynaecology Department of the Yaound Gynaeco-Obstetric and Paediatric Hospital Yaound Cameroon Radiology and Medical Imaging Department of the Yaound Gynaeco-Obstetric and Paediatric Hospital Yaound Cameroon Pathology Department of the Yaound Gynaeco-Obstetric and Paediatric Hospital Yaound Cameroon

Accessory or ectopic breast tissue is an anomaly in the development of the breast. It is a rare condition that occurs along the embryological mammary line. In less than 1% of all breast cancers, supernumerary breast cancer is reported, with the axillary location being the most common in 60% to 90% of cases. Cancerous degeneration of this supernumerary breast tissue can pose a dual diagnostic and therapeutic problem. We report the case of locally advanced adenocarcinoma in a right supernumerary breast. This is a 75-year-old, grand-multiparous, postmenopausal, and known hypertensive patient on treatment. Family history was remarkable for brain cancer in her sister and oesophageal cancer in her mother. She consulted for a mass in the right axillary cavity on supernumerary breast evolving for a year. Clinical examination revealed a large, fixed, budding and haemorrhagic-ulcerated mass of the right axilla, with long axis measuring about 15 cm. There was as wella supernumerary breast on the left, but without particularity. A soft tissue ultrasound showed a large hypoechoicmass in the right axillary region of 116 mm with areas of central necrobiosis. Morphologically, the breasts were normal. A breast MRI revealed a subcutaneous mass in the right axillary cavity with skin ulceration and satellite lymphadenopathy. The extension assessment revealed liver metastases, and a biopsy of the mass revealed a breast adenocarcinoma. The case was the subject of a multidisciplinary consultation meeting following which a wide excision of the mass was indicated. The histo-pathology analysis results of the surgical specimen were in favour of a triple negative papillary adenocarcinoma. After a post-operative multidisciplinary consultation meeting, adjuvant chemotherapy was indicated. The development of supernumerary breasts depends on hormones, just like normal breasts. Breast cancer in accessory breast tissue is quite rare with the incidence being 6%. The most common pathology is invasive

关键词： Adjuvant Chemotherapy Papillary Adenocarcinoma Surgery Supernumerary Breast Treatment of Supernumerary Breast Cancer

男性雄激素性脱发患者毛囊皮脂腺单位的转录组学分析显示其细胞间连接网络发生改变

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中华皮肤科杂志 2024年第10期57卷 967-967页

作者： Elias Bou Samra yann Franck Mahé Mickael Le Balch Nükhet Cavusoglu Pierre Bouhanna Khalid Bakkar L'Oréal Research and Innovation Aulnay-sous-Bois France Bouhanna Hair Transplant Clinic Paris France

随着研究的不断深入,越来越多的证据表明,脱发的发病机制涉及多种生理途径,包括引起直接损伤的炎症细胞因子和趋化因子、调节形态发生的以Wnt/β-联蛋白(catenin)为主的信号通路以及系统性炎症和脂质代谢相关通路。根据个体的遗传背景... 详细信息

随着研究的不断深入,越来越多的证据表明,脱发的发病机制涉及多种生理途径,包括引起直接损伤的炎症细胞因子和趋化因子、调节形态发生的以Wnt/β-联蛋白(catenin)为主的信号通路以及系统性炎症和脂质代谢相关通路。根据个体的遗传背景、生活方式、性别和年龄,上述效应因子和靶点先后被不同程度地激活。因此,深入解析脱发患者特异性的病理生理机制,对于制定精准的治疗方案尤为重要。

关键词：病理生理机制雄激素性脱发炎症细胞因子细胞间连接系统性炎症趋化因子脂质代谢形态发生

Rupture behavior and deformation localization of the Kunlunshan earthquake (M_w7.8) and their tectonic implications

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Earth Sciences 2008年第10期51卷 1361-1374页

作者： KLINGER yann TAPPONNIER Paul Institut de Physique du Globe

Earthquake surface rupture is the result of transformation from crustal elastic strain accumulation to permanent tectonic deformation. The surface rupture zone produced by the 2001 Kunlunshan earth- quake (Mw7.8) on the Kusaihu segment of the Kunlun fault extends over 426 km. It consists of three relatively independent surface rupture sections: the western strike-slip section, the middle transten- sional section and the eastern strike-slip section. Hence this implies that the Kunlunshan earthquake is composed of three earthquake rupturing events, i.e. the Mw=6.8, Mw=6.2 and Mw≤7.8 events, respec- tively. The Mw≤7.8 earthquake, along the eastern section, is the main shock of the Kunlunshan earth- quake, further decomposed into four rupturing subevents. Field measurements indicate that the width of a single surface break on different sections ranges from several meters to 15 m, with a maximum value of less than 30 m. The width of the surface rupture zone that consists of en echelon breaks de- pends on its geometric structures, especially the stepover width of the secondary surface rupture zones in en echelon, displaying a basic feature of deformation localization. Consistency between the Quaternary geologic slip rate, the GPS-monitored strain rate and the localization of the surface rup- tures of the 2001 Kunlunshan earthquake may indicate that the tectonic deformation between the Ba- yan Har block and Qilian-Qaidam block in the northern Tibetan Plateau is characterized by strike-slip faulting along the limited width of the Kunlun fault, while the blocks themselves on both sides of the Kunlun fault are characterized by block motion. The localization of earthquake surface rupture zone is of great significance to determine the width of the fault-surface-rupture hazard zone, along which direct destruction will be caused by co-seismic surface rupturing along a strike-slip fault, that should be considered before the major engineering project, residental buildings and life

关键词： Tibetan Plateau Kunlunshan earthquake earthquake surface rupture zone deformation localization rupture behavior

Morphology and possible origins of the Perm anomaly in the lowermost mantle of Earth

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Earth and Planetary Physics 2021年第1期5卷 105-116页

作者： YuMei He LianXing Wen yann Capdeville Key Laboratory of Earth and Planetary Physics Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Mohe Observatory of Geophysics Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Laboratory of Seismology and Physics of Earth’s Interior School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China Department of Geosciences State University of New York at Stony BrookStony BrookNew YorkUSA Laboratoire de Planétologie et Géodynamique de Nantes UMR6112CNRSUniversitéde NantesNantesFrance

We have constrained a small-scale,dome-shaped low-velocity structure near the core-mantle boundary(CMB)of Earth beneath Perm(the Perm anomaly)using travel-time analysis and three-dimensional(3-D)forward waveform modeling of seismic data sampling of the *** best-fitting dome-shaped model centers at 60.0°E,50.5°N,and has a height of 400 km and a radius that increases from 200 km at the top to 450 km at the *** velocity reduction varies from 0%at the top to–3.0%at 240km above the CMB to–3.5%at the CMB.A surrounding 240-km-thick high-velocity D''structure has also been *** Perm anomaly may represent a stable smallscale chemical pile in the lowermost mantle,although the hypothesis of a developing mantle plume cannot be ruled out.

关键词： seismic velocity structure core-mantle boundary Perm anomaly chemical pile

Oozing sub-cutaneous masses due to histoplasmosis in a patient from Mali

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Medicine 2010年第2期3卷 158-159页

作者： yann A.Meunier Stanford Health Promotion Network Stanford School of Medicine

We presented the case of a 64 year old from Mali who was admitted to the hospital for "oozing sub-cutaneous masses".The diagnosis of African histoplasmosis was established by serology. Several courses of amphotericin ... 详细信息

关键词： Oozing Sub-cutaneous Masses Mali African histoplasmosis