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Measurements of the Electrical Incidence Angle Modifiers of an Asymmetrical Photovoltaic/Thermal Compound Parabolic Concentrating-Collector

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Engineering（科研） 2013年第1期5卷 37-43页

作者： Bernardo Ricardo Davidsson Henrik Gentile Niko gomes Joao Gruffman Christian Chea Luis Mumba Chabu Karlsson Bjorn Energy and Building Design Lund UniversityLundSweden Solarus Sunpower AB StockholmSweden Finsun AB AlvkarlebySweden Universidade eduardo Mondlane MaputoMozambique University of Zambia LusakaZambia Division of Energy Engineering Malardalen UniversityVasterasSweden

Reflector edges, sharp acceptance angles and by-pass diodes introduce large variations in the electrical performance of asymmetrical concentrating photovoltaic/thermal modules over a short incidence angle interval. It is therefore important to quantify these impacts precisely. The impact on the electrical performance of the optical properties of an asymmetrical photovoltaic/thermal CPC-collector was measured in Maputo, Mozambique. The measurements were carried out with the focus on attaining a high resolution incidence angle modifier in both the longitudinal and transversal directions, since large variations were expected over small angle intervals. A detailed analysis of the contribution of the diffuse radiation to the total output was also carried out. The solar cells have an electrical efficiency of 18% while the maximum measured electrical efficiency of the collector was 13.9 % per active glazed area and 20.9 % per active cell area, at 25 °C. Such data make it possible to quantify not only the electrical performance for different climatic and operating conditions but also to determine potential improvements to the collector design. The electrical output can be increased by a number of different measures, e.g. removing the outermost cells, turning the edge cells 90°, dividing each receiver side into three or four parts and directing the tracking, when used, along a north-south axis.

关键词： CPC-collector PVT hybrid incidence angle modifier asymmetric collector electrical efficiency

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Construction of a Small Scale Laboratory for Solar Collectors and Solar Cells in a Developing Country

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Engineering（科研） 2013年第1期5卷 75-80页

作者： Gentile Niko Davidsson Henrik Bernardo Ricardo gomes Joao Gruffman Christian Chea Luis Mumba Chabu Karlsson Bjorn Energy and Building Design Lund UniversityLundSweden Solarus Sunpower Sweden AB StockholmSweden Finsun AB AlvkarlebySweden Universidade eduardo Mondlane MaputoMozambique University of Zambia LusakaZambia Division of Energy Engineering Malardalen UniversityVasterasSweden

In the field of renewable energy, self-provided research in developing countries is barely present, but most welcomed. The creation of know-how and self-development of technologies should reduce the dependence on industrialized countries for both materials and knowledge. This work presents technological and social issues related to the construction of a low budget solar laboratory in Mozambique. The goal is to demonstrate that scientific level research can be carried out in developing countries by using affordable solutions without sacrificing quality of the results. For this investigation, a solar laboratory was built in 2011 at Universidade eduardo Mondlane of Maputo. The laboratory enables measurements?to evaluate solar?thermal and?photovoltaic-thermal?hybrid collectors.?Thanks to the?flexibility of the system,?students and teaching staff can?add/remove equipment and develop customised local research programs. In addition, a course on the principles of solar energy and collector simulation for local students was taught. The needed data acquisition devices usually used in Europe were compared with cheaper and easy-maintenance ones. Calibration and estimation of the uncertainty were successfully performed. Approximately 9% of inaccuracy in the measurement was introduced by the cheaper equipment, but the investment cost was reduced by more than 90%. Other issues, results and future recommendations are shown.

关键词： solar thermal solar hybrid small-scale laboratory scientific research developing country Mozambique

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Endoscopic ultrasound artificial intelligence-assisted for prediction of gastrointestinal stromal tumors diagnosis:A systematic review and meta-analysis

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World Journal of Gastrointestinal Endoscopy 2023年第8期15卷 528-539页

作者： Rômulo Sérgio Araújo gomes Guilherme Henrique Peixoto de Oliveira Diogo Turiani Hourneaux de Moura Ana Paula Samy Tanaka Kotinda Carolina Ogawa Matsubayashi Bruno Salomão Hirsch Matheus de Oliveira Veras João Guilherme Ribeiro Jordão Sasso Roberto Paolo Trasolini Wanderley Marques Bernardo eduardo Guimarães Hourneaux de Moura Department of Gastroenterology Hospital das Clínicas da Faculdade de Medicina da Universidade de São PauloSão Paulo 05403-010Brazil Division of Hepatology and Endoscopy Department of GastroenterologyHarvard Medical SchoolBrigham and Women’s HospitalBostonMA 02115United States

BACKGROUND Subepithelial lesions(SELs)are gastrointestinal tumors with heterogeneous malignant *** ultrasonography(EUS)is the leading method for evaluation,but without histopathological analysis,precise differentiation of SEL risk is *** intelligence(AI)is a promising aid for the diagnosis of gastrointestinal lesions in the absence of *** To determine the diagnostic accuracy of AI-assisted EUS in diagnosing SELs,especially lesions originating from the muscularis propria *** Electronic databases including PubMed,EMBASE,and Cochrane Library were *** of any sex and>18 years,with SELs assessed by EUS AIassisted,with previous histopathological diagnosis,and presented sufficient data values which were extracted to construct a 2×2 *** reference standard was *** primary outcome was the accuracy of AI for gastrointestinal stromal tumor(GIST).Secondary outcomes were AI-assisted EUS diagnosis for GIST vs gastrointestinal leiomyoma(GIL),the diagnostic performance of experienced endoscopists for GIST,and GIST vs *** sensitivity,specificity,positive,and negative predictive values were *** corresponding summary receiver operating characteristic curve and post-test probability were also *** Eight retrospective studies with a total of 2355 patients and 44154 images were included in this *** AI-assisted EUS for GIST diagnosis showed a sensitivity of 92%[95%confidence interval(CI):0.89-0.95;P<0.01),specificity of 80%(95%CI:0.75-0.85;P<0.01),and area under the curve(AUC)of *** diagnosis of GIST vs GIL by AI-assisted EUS,specificity was 90%(95%CI:0.88-0.95;P=0.02)and AUC of *** experienced endoscopists’values were sensitivity of 72%(95%CI:0.67-0.76;P<0.01),specificity of 70%(95%CI:0.64-0.76;P<0.01),and AUC of 0.777 for *** GIST vs GIL,the experts achieved a sensitivity of 73%(95%CI:0.65-0.80;P<0.01)and an AUC of ***

关键词： Subepithelial lesions Ultrasound endoscopy Artificial intelligence

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Influence of Tomographic Slice Thickness and Field of View Variation on the Reproduction of Thin Bone Structures for Rapid Prototyping Purposes-An in Vitro Study

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Open Journal of Radiology 2013年第1期3卷 12-25页

作者： Maria Ines Meurer Kivia Pires Souza Aldo von Wangenheim Daniel Duarte Abdala Luis Felipe de Souza Nobre eduardo Meurer Jorge Vicente Lopes da Silva Department of Pathology Federal University of Santa CatarinaFlorianopolisBrazil Postgraduate Programme on Dento-Maxillo-Facial Radiology Health Sciences CenterFederal University of Santa CatarinaFlorianopolisBrazil Brazilian Institute for Digital Convergence Federal University of Santa CatarinaFlorianopolisBrazil Department of Computer Sciences Federal University of UberlandiaUberlandiaBrazil Department of Clinical Medicine Federal University of Santa CatarinaFlorianopolisBrazil Oral and Maxillofacial Surgery Homero de Miranda Gomes Regional HospitalSao JoseBrazil Renato Archer Center for Information Technology CampinasBrazil

This study assessed the influence of acquisition parameters of tomographic volumes on the reproduction of thin bone structures for rapid prototyping purposes. Two parameters were investigated: Field of View (FOV) and Slice Thickness (ST). The specimen was comprised of five pairs of 0.6 mm, 1.1 mm, 1.5 mm, 2.0 mm and 2.8 mm thick cortical bone plates. The plates were stuck into utility wax;the first plate of the pair was in vertical position while the second plate was oblique to the first one. Forty-five tomographic images were captured and separated into 3 groups of fifteen images. Each group had a specific FOV: 180 mm;250 mm and 430 mm, respectively. Within each of these three groups, tomographic slice thickness was varied for every five of the fifteen slices. Acquisitions were carried out with STs of 1 mm, 2.5 mm and 5 mm. The Cyclops Medical Station software was used in the voxel-to-voxel analysis of radiologic density, reaching a total of 1350 assessed images. ST and FOV variation influenced the reproduction of thin bone walls, and FOV was shown to be a very important parameter. The larger the acquisition FOV, the more reduction in the number of voxels within the range of reconstruction for cortical bone in all of the bone plates. The visual analysis of the images of very thin bone walls showed that there could be a sharp drop in the radiologic density value in several adjacent voxels, resulting in areas which might not be reproduced in the reconstruction.

关键词： Computed Tomography Rapid Prototyping Medical Rapid Prototyping Model

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Remaining Useful Life Prediction of Li-Po Batteries in UAVs Using Extended Kalman Filter

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Journal of Mechanics Engineering and Automation 2015年第12期5卷 687-690页

作者： Darielson A. Souza Joao L. O. Tortes Joao Paulo P. gomes Leonardo R. Rodrigues Romulo N. de C.Almeida Vandilberto P. Pinto Programa de Pos-Graduacao em Engenharia Eletrica e de Computacao Universidade Federal do Ceara Campus de Sobral Rua Coronel Estanislau Frota s/n Sobral - Ceara 620.010-560 Brazil Departamento de Engenharia Eletrica Universidade Federal do Ceara Campus de Sobral Rua Coronel Estanislau Frota s/n Sobral - Ceara 620. 010-560 Brazil Universidade Federal do Ceara Departamento de Computacao Rua Campus do Pici s/n 620.010-000 Brazil Divisao de Eletronica Instituto de Aeronautica e Espacao Praga Marechal Eduardo Gomes 50 Vila das Acacias Sao Jose dos Campos- SP 12.228-904 Brazil

The use of batteries in UAVs （unmanned aerial vehicles） has become common due to some advantages in comparison with internal combustion engines such as weight reduction and better power control. However, in these vehicles it is critical to monitor the RUL （remaining useful life） of the batteries. This information can be used, for instance, as a decision support tool to define which missions could be assigned to the UAV until the next battery recharge. This work presents a methodology to predict the RUL of Li-Po （Lithium-Polymer） batteries. The approach uses an extended Kalman filter and an exponential model for the degradation evolution. The proposed methodology uses time series of battery terminal voltages, assuming that the discharge occurs under a constant current condition. Different discharge current levels were *** results showed that the proposed methodology provides good results, despite its simplicity.

关键词： Extended Kalman filter Li-Po battery RUL estimation UAV.

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Prescription of Cancer Treatment Modalities in Developing Countries:Results from a Multi-Centre Observational Study

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Journal of Cancer Therapy 2014年第11期5卷 989-999页

作者： Rolando Camacho Diogo Neves Marion Pineros eduardo Rosenblatt Robert Burton Yaima Galán Feras Hawari Saadettin Kilickap Cláudia Naylor Florian Nicula Jesus Reno Bhawna Sirohi Tatiana Vidaurre Kazem Zendehdel International Atomic Energy Agency ViennaAustria Monash University MelbourneAustralia Ministry of Health La HabanaCuba King Hussein Cancer Centre AmmanJordan Hacettepe University Oncology Centre AnkaraTurkey National Cancer Institute Jose Alencar gomes da Silva Rio de JaneiroBrazil Institute of Oncology Prof.Dr.Ion Chiricuta Cluj-NapocaRomania National Institute of Oncology and Radiobiology La HabanaCuba Tata Memorial Hospital MumbaiIndia National Institute of Neoplastic Diseases LimaPeru Cancer Research Center Cancer Institute of IranTehran University of Medical SciencesTehranIslamic Republic of Iran

Background: Treatment is an important component of a comprehensive cancer control approach and its outcomes strongly depend on infrastructure, equipment, human and financial resources available. Therefore it is imperative to generate evidence-based tools to assist health policy makers from low resourced countries in planning efficient and equitable treatment services for a defined population based on what it is feasible to these settings. Methods: The intended cancer spe-cific treatment planned and written in the patients’ medical record (treatment prescription) of untreated adult cancer cases (≥18 years of age), excluding non-melanoma skin cancer, was recorded in a chronological way from 1 January 2012 onwards in a group of eight comprehensive cancer centres located in middle income countries and offering the main modalities of cancer treatment (surgery, medical oncology and radiotherapy). Results: A total of 17,713 medical records were reviewed, of which 7106 (54.2%) met the eligibility criteria. Prescription of main cancer treatment modalities were distributed as follows: 57.6% for chemotherapy (n = 4093), 56.8% for surgery (n = 4038), and 46.8% for radiotherapy (n = 3327). There was a predominance of plans consisting of combined treatment modalities over monotherapy (55.2% versus 44.8%). At the time of diagnosis 54.3% of the cancer cases had disease that had spread beyond the primary site, 41.2% were considered as having local disease and in 4.5% of the cases the information on disease extension was unknown. Conclusions: The results obtained should be seen as an approximation of cancer treatment service demand based on what it is currently practiced and therefore feasible in developing countries, particularly in middle income countries.

关键词： Cancer Treatment Developing Countries Health Services Needs and Demand Resource Allocation Observational Study

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Temporomandibular Disorder in University Students of the Parque das Rosas Campus, Universidade Estácio de SáThat Practice Sports

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Health 2016年第1期8卷 18-23页

作者： Rosineli Paz Cabral Manuel eduardo Moiolli-Rodrigues Flávia Lima Kleinsorgen Motta Francisco Carlos Kleinsorgen de Souza Motta Juliana Rocha da Silva Larissa Malheiros Neide Martins Leonardo Trepte André Luiz G. Abrão Adalgisa Maiworm Luiz Carlos Oliveira Raphael Lemgruber Cardoso Adriano Arnóbio Giuseppe Antonio Presta Danúbia da Cunha de Sá Caputo Sebastião David Santos Filho Éric Heleno F. F. Frederico Mario Bernardo-Filho Severo de Paoli Universidade Estácio de Sá—Campus R9—GEPS R9 Rio de Janeiro Brasil Universidade Estácio de Sá—Campus Parque das Rosas Rio de Janeiro Brasil Departamento de Biofísica e Biometria Instituto de Biologia Roberto Alcantara Gomes Universidade do Estado de Rio de Janeiro Rio de Janeiro Brasil Programa de Pós-Graduacao em Fisiopatologia Clínica e Experimental Faculdade de Ciências Médicas Universidade do Estado do Rio de Janeiro Rio de Janeiro Brasil UniFacex—Centro Universitário do Facex Natal Brasil Programa de Pós-Graduacao em Biociências Instituto de Biologia Roberto Alcantara Gomes Universidade do Estado do Rio de Janeiro Rio de Janeiro Brasil

The stomatognathic system (SS) is a functional unit of the body that depends on the balance of several tissues. It consists of various structures, including the temporomandibular joint. Temporomandibular disorder (TMD) can occur due to alterations in the SS. The Fonseca Anamnestic Index (FAI) is a scale used to evaluate and to characterize the TMD Type: no DTM, mild, moderate and severe. The aim is to evaluate the prevalence of signs and symptoms related to TMD in university students of the Parque das Rosas Campus, Universidade Estácio de Sá that practice sports. This investigation was approved (CAAE number 325678413.9.0000.5284). Two hundred eighth students (110 male and 98 female, aged 19 - 35 years) accepted to be in this investigation. All the participants answered a General Questionnaire (GQ) and the FAI. The GQ had questions about the age, sex and the presence of TMD. The FAI was used. A statistical difference (p > 0.05) was not found about the presence of TMD. Among the female, an elevated number of the students with signal or symptoms related to the temporomandibular with statistic significance (p < 0.05) was observed. In the population without TMD, the prevalence of this disorder is higher between male than female. Considering the FAI, among the female students, there is a prevalence of the Mild Type. Considering the evaluation of the type of TMD among the male and female students no difference was found between male and female to the types mild and moderate, however, the prevalence of the severe Type is higher in female than in male with statistical significance. In conclusion, TMD is a relevant clinical condition with an important prevalence among the university students. Moreover, the type of the TMD could be considered due to prevalence of the Type Severe among the women.

关键词： Temporomandibular Disorder University Student Fonseca Anamnestic Index Prevalence

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