Study of the Absorptance of Si-gratings and of arrays of SiO2-filled trenches on Si-grating substrate

The purpose of this paper is to study the radiative properties of two model structures. The first model (A-1) is a rectangular grating of silicon (Si). The second one (A-2) is obtained from A-1 by filling their trenches by SiO2. These patterned wafers are characterized by three geometrical parameters, the period d, the filling factorand the thickness h. To derive and compute the radiative properties we use a rigorous coupled wave analysis (RCWA) method. Our attention is focused on the absorptance of these structures when they are illuminated by a monochromatic plane wave. We investigate the effect of the filling factor on the absorptance versus the direction of the incident wave. At specific angles of incidence the effect of the period is also studied. Besides, the influence of the thickness h on the absorptance is included throughout this work. At the wavelength = 632,8nm, we especially show that we can identify several perfect absorber model structures characterized by specific parameters and by accurate angle of incidence. We show that this will be done in both transverse electric (TE) and transverse magnetic (TM) polarization cases

Impact on survival of nuclear atypia in epithelioid malignant mesothelioma

Introduction: Malignant pleural mesothelioma is a rare tumour with a bad prognosis. The only consensual prognostic factorsare represented by the stage and the histologic type. Concerning the histologic type, epithelioid mesothelioma is known to havebetter prognosis in comparison with the sarcomatoid and biphasic types. Epithelioid mesotheliomas have been reported to bea heterogeneous prognostic group. Our aim was to assess the impact on the survival of different characteristics of epithelioidmesothelioma, including nuclear atypia, mitotic count, MIB-1 index, inflammatory host response, stromal desmoplasia, necrosis,vascular emboli and invasion depth. Material and methods: We performed a study of survival of 30 malignant pleural mesotheliomas according to the differentparameters studied. Results: The study included 26 women and 4 men. The mean age of the patients was 61 years. The microscopic exam concludedto an epithelioid mesothelioma in 17 cases, sarcomatoid mesothelioma in 4 cases and biphasic mesothelioma in 9 cases. The 17cases of epithelioid mesothelioma developed severe nuclear atypia in 6 cases and mild nuclear atypia in 11 cases. The mitoticcount and the MIB-1 score were respectively inferior to 5 mitoses/50 HPF and inferior to 10% in 11 cases and were superior to5 mitoses/50 HPF and superior to 10% in 6 cases. No vascular emboli were recorded. Tumour necrosis was reported in 1 case.The inflammatory host response was severe in 4 cases and mild in 13 cases. The tumoral stroma was desmoplastic in 4 cases.The invasion depth was superior to 0.5mm in 16 cases. The median overall survival amounted to 180 days. Nuclear atypia wasthe only feature that had impact on survival in the group of epithelioid mesothelioma. Conclusion: Our results highlight the correlation of nuclear atypia with survival

An uncommon subtype of breast carcinoma in a man: The pure mucinous carcinoma

Aim: Our purpose is to describe a new case of pure mucinous carcinoma in a man, to put emphasis on the rarity of this histologic subtype and the problems of management due to the fewer reported cases in the literature and to compare it with the female counterpart. Observation: We report the case of a 79- year-old man presenting as a nodular mass of the right breast. The clinical symptoms weren’t specific and the diagnosis was based on histological and immunohistochemical findings. Conclusion: Male breast carcinoma is rare compared to its female counterpart representing less than 2% of male breast carcinomas and 1% of all breast carcinomas. Pure mucinous carcinoma in male is an extremely rare histological subtype. It is a variety of carcinoma of the breast which is characterized by the production of an abundant extra-cellular and/or intra-cellular mucin. It has been regarded as one of the more benign forms of breast carcinomas. To our knowledge, about 30 cases of mucinous breast carcinoma in male have been reported in the English literature and only 10 cases of pure mucinous carcinoma have been described. In general, pure mucinous carcinomas have a favorable prognosis. Numerous studies have shown that breast carcinomas in male behave more aggressively compared to those in females. Further research is needed on male carcinomas as they are becoming more frequent

Castleman's Disease: An Intrapulmonary Form with Intrafissural Development

Castleman's disease (CD) is an uncommon, mainly benign, lymphoproliferative disorder of unknown etiology, mostly involving the mediastinum. Parenchymal lung involvement of the disease is exceedingly rare. We describe a case of CD in a 23-year-old woman with a 4-year history of recurring dyspnea and nonproductive cough, whose chest X-ray showed an abnormal shadow of the right hilum. Chest computed tomography confirmed the presence of a tissue-density mass of the right lower lobe, demonstrating poor contrast enhancement, associated with multiple laterotracheal and mediastinal lymphadenopathies. The patient underwent curative surgery, revealing a right hilar compressive mass, with an intrafissural development between the superior and middle lobes. Pneumonectomy was performed due to profuse bleeding. This case of CD is particular because of its unusual intrapulmonary location and its intrafissural development. Poor contrast enhancement is atypical in CD

Review of the literature about Thymic Carcinomas

Background: Thymic carcinomas (TC) are rare tumors with challenging diagnosis and management. We aimed to describe the clinical and microscopic characteristics of TC through a literature review.Results: 82 articles and abstracts were retained about 2913 TC. Our study contained 1760 men and 1153 women with a mean age of 55.32 years. The delay of diagnosis was specified in 10 cases and varied between 8 months and 2 years. Symptoms consisted mainly in chest pain and dyspnea. The Computed Tomography-scan&nbsp; (CT-scan) findings&nbsp; were&nbsp; specified&nbsp; in&nbsp; 63&nbsp; cases.&nbsp; Microscopic findings&nbsp; were&nbsp; noticed&nbsp; in 1766&nbsp; cases.&nbsp; They&nbsp; consisted&nbsp; mainly&nbsp; in&nbsp; squamous&nbsp; cell&nbsp; carcinoma&nbsp; in&nbsp; 1297&nbsp; cases&nbsp; and&nbsp; undifferentiated carcinoma in 239 cases. The patients presented stage 1 tumors in 165 cases, stage II in 362 cases, stage III in 1011 cases and stage IV in 1166 cases. The treatment modalities were noticed in 2803 cases. There was no consensus of the regimen of chemotherapy or the place of the radiation therapy but all studies highlighted the key role of the complete surgical resection when possible.Conclusion: Our&nbsp; results&nbsp; highlight&nbsp; the&nbsp; lack&nbsp; of&nbsp; consensual&nbsp; management&nbsp; of&nbsp; TC.&nbsp; The&nbsp; chemotherapy regimen,&nbsp; the&nbsp; second-line&nbsp; chemotherapy&nbsp; and&nbsp; the&nbsp; indications&nbsp; of&nbsp; radiation&nbsp; therapy&nbsp; seem&nbsp; non-consensual and&nbsp; need&nbsp; further&nbsp; studies.&nbsp; Many&nbsp; interrogations&nbsp; remain&nbsp; concerning&nbsp; the&nbsp; management&nbsp; of&nbsp; these&nbsp; tumors according&nbsp; to&nbsp; their&nbsp; histologic&nbsp; grade.&nbsp; The&nbsp; real&nbsp; place&nbsp; of&nbsp; targeted&nbsp; therapy&nbsp; remains&nbsp; to&nbsp; assess&nbsp; and&nbsp; the&nbsp; rare opinions published are based on rare and non-representative cases.</p

Cystic Micronodular Thymoma. Report of a Case

Micronodular thymoma is a rare subtype of thymoma with less than 20 cases published in the English literature. These tumours have been reported with thymoma or thymic cyst. The authors describe a new case of micronodular thymoma in a 68-year-old-patient which is well documented and particular by its cystic degeneration which hasn&rsquo;t been described yet. Micronodular thymoma is a rare variant of thymoma with a challenging diagnosis. Clinicians must be aware of this entity in order not to confuse it with a thymic cyst

Report of a Case

ABSTRACT Micronodular thymoma is a rare subtype of thymoma with less than 20 cases published in the English literature. These tumours have been reported with thymoma or thymic cyst. The authors describe a new case of micronodular thymoma in a 68-year-old-patient which is well documented and particular by its cystic degeneration which hasn&apos;t been described yet. Micronodular thymoma is a rare variant of thymoma with a challenging diagnosis. Clinicians must be aware of this entity in order not to confuse it with a thymic cyst

Towards big services: a synergy between service computing and parallel programming

International audienceOver the last years, cloud computing has emerged as a natural choice to host, manage, and provide various kinds of virtualized resources (e.g., software, business processes, databases, platforms, mobile and social applications, etc.) as on-demand services. This “servicelization” across various domains has produced a huge volume of data, leading to the emergence of a new service model, called big service. This latter consists of the encapsulation, abstraction and the processing of big data, allowing then to hide their complexity. However, this promising approach still lacks management facilities and tools. Indeed, due to the highly dynamic and uncertain nature of their hosting cloud environments, big services together with their accessed data need continuous management operations, so that to maintain a moderate state and high quality of their execution. In this context, frameworks for designing, composing, executing and managing big services become a major need. The purpose of this paper is to provide an understanding of the new emerging big service model from the lifecycle management phases’ point of view. We also study the role of big data frameworks and multi-cloud strategies in the provisioning of big services. A research road map on this topic will be summarized at the end of this paper