86,659 research outputs found
F. Pisanelli, L. Toppan, Confini di-versi. Frontiere, orizzonti e prospettive della poesia italofona contemporanea, Firenze, FUP, 2020
No full textRecensione a F. Pisanelli, L. Toppan, Confini di-versi
Análise comparativa de normas para a punção em lajes de concreto armado
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia Civil, Florianópolis, 2010Os sistemas estruturais usados em pavimentos de concreto armado, em que as lajes se apóiam diretamente sobre os pilares, sem o uso de vigas, têm, entre suas características, a existência de tensões concentradas elevadas nas ligações laje-pilar, tensões estas que podem até levar à ruína. A esse efeito dá-se o nome de punção. Como a ruptura das ligações por punção é do tipo frágil, sem aviso, é extremamente importante que seja feita a verificação da resistência da ligação. As crescentes inovações técnicas e a análise dos critérios normativos propostos pelo ACI 318/08, BS 8110/97, NBR 6118/03 e EUROCODE 2/04 para o dimensionamento ao esforço de punção em lajes lisas de concreto armado são as diretrizes da elaboração do presente estudo. Dentro deste cenário, o objetivo desta dissertação é avaliar a acessibilidade, aplicabilidade, limitações e economia destes critérios por meio da comparação de resultados obtidos na análise de pilares internos em três configurações diferentes de lajes, variando suas espessuras. Foram analisados os seguintes parâmetros: a) para laje sem armadura de punção, compararam-se as relações entre tensões resistentes e solicitantes; as máximas reações que podem ser aplicadas à laje; a proporcionalidade do efeito dos momentos em relação a uma carga simétrica; excentricidades médias em relação às reações máximas suportadas pela Norma Britânica e um coeficiente estipulado para simular o efeito dos momentos fletores supondo-se uma carga de reação simétrica. B) para lajes com armadura de punção, compararam-se as relações entre tensões resistentes e solicitantes e o consumo de armadura de punção necessária segundo as recomendações de cada norma.The structural systems in reinforced concrete, where the slab is directly supported by the columns, without the use of beams, has, among its aspects, the existence of great tensions distributed in small areas, which can lead the structure to collapse. This effect is called punching shear. As the punching shear collapse occurs without warning, it is of extreme importance that the slab-column resistance verification is made. The increasing technical innovations and analysis of normative criteria proposed by ACI 318/08, BS 8110/97, NBR 6118/03 and EUROCODE 2 / 04 for punching analysis in flat slabs of reinforced concrete are the guidelines of this study. In this scenario, the main objective of this work is to evaluate these punching shear design procedures in terms of accessibility, applicability, limitations and economy, comparing the results obtained on analysis of a internal column in three different slabs configurations, varying their thicknesses. The following parameters had been analyzed and compared, as the recommendations of each code: a) for slabs without links, the relation between the resisted and applied tension, the maximum actions that can be applied, the representativeness of the unbalanced moment to the load reaction, and a increase coefficient to consider the effects of unbalanced moments; b) for slabs with links, the relation between resisted and applied tension and the armor consumption necessary to resist the loads for each case had been compared, according the recommendations of each code
Comprehensive Assessment of Context-Adaptive Street Lighting: Technical Aspects, Economic Insights, and Measurements from Large-Scale, Long-Term Implementations
No full textThis paper addresses the growing importance of efficient street lighting management, driven by rising electricity costs and the need for municipalities to implement cost-effective solutions. Central to this study is the UNI 11248 Italian regulation, which extends the European EN 13201-1 standard introduced in 2016. These standards provide guidelines for designing, installing, operating, and maintaining lighting systems in pedestrian and vehicular traffic areas. Specifically, the UNI 11248 standard introduces the possibility to dynamically adjust light intensity through two alternative operating modes: (a) Traffic Adaptive Installation (TAI), which dims the light based solely on real-time traffic flow measurements; and (b) Full Adaptive Installation (FAI), which, in addition to traffic measurements, also requires evaluating road surface luminance and meteorological conditions. In this paper, we first present the general architecture and operation of an FAI-enabled lighting infrastructure, which relies on environmental sensors and a heterogeneous wireless communication network to connect intelligent, remotely controlled streetlights. Subsequently, we examine large-scale, in-field FAI infrastructures deployed in Vietnam and Italy as case studies, providing substantial measurement data. The paper offers insights into the measured energy consumption of these infrastructures, comparing them to that of conventional light-control strategies used in traditional installations. The measurements demonstrate the superiority of FAI as the most efficient solution
Enhancing Wi-Fi Coverage Through ZigBee Mesh Network of Energy Scan Devices
No full textIn this demo we present a solution for detailed coverage assessment and failures recovery in an IEEE 802.11 Wi-Fi network deployed in highly dynamical environment (e.g., where signal propagation is impacted by frequent topological changes). Monitoring of the electromagnetic energy received by an Access Point (AP) is performed by multiple battery-powered ZigBee-compliant devices dislocated in the environment. The key is a novel use of the Energy Detection Scan functionality implemented in the IEEE 802.15.4 standard. ZigBee devices wirelessly send their readings to a coordinator device which is in turn connected to a workstation. The latter serves as a i) configuration spot of the ZigBee network, ii) concentrator and data processor/visualizer, and iii) actuator. Such coordinating workstation can indeed detect and switch off an AP that is deemed ineffective (due to, e.g., damages or unfavorable propagation conditions), and start up one or more pre-deployed backup APs, so that coverage is preserved and clients can seamlessly keep on performing their activities. Hence, our scheme optimizes the performance of a Wi-Fi network by means of a low-cost, independent and self-maintaining mesh network, while strongly limits human intervention
B-C SYSTEM APPROACH TO MINIMAL MODELS. 1. THE GENUS ZERO CASE
No full textWe present a method based on real weight b-c system to study conformal minimal models. In particular it reproduces the results of the Coulomb gas approach, while shedding light on the topological origin of the charge at infinity
REAL WEIGHT B-C SYSTEMS AND CONFORMAL FIELD THEORY IN HIGHER GENUS
No full textWe define bases for differentials with real weight λ on higher genus Riemann surfaces and the corresponding b-c systems. We generalize them by defining real weight bases and b-c systems describing spin field or vertex insertions at specified points of the Riemann surface. We use this formalism to calculate various kinds of correlation functions of λ-spin fields, for rational λ. We also compute the basic correlation functions of chiral vertex insertions in minimal models
Variations on the Author
No full text“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Complete Pathologic Response Following Preoperative Chemoradiation Therapy for Middle to Lower Rectal Cancer Is Not a Prognostic Factor for a Better Outcome
No full textPURPOSE:
The aim of this study was to evaluate factors associated with pathologic tumor response following pre-operative chemoradiation therapy, and the prognostic impact of pathologic response on overall and disease-free survival.
METHODS:
Between 1994 and 2002, 132 patients underwent chemoradiation therapy followed by surgery for middle to lower rectal cancer. After excluding 26 cases (metastatic cancer, n = 13; nonradical surgery, n = 6; local excision procedure, n = 4; non-5-fluorouracil-based chemotherapy, n = 2; incomplete data on preoperative chemoradiation therapy regimen used, n = 1), the remaining 106 patients were included in the study. Variables considered were the following: age, gender, tumor location, pretreatment T and N stage, modality of 5-fluorouracil administration, total radiotherapy dose delivered, chemoradiation therapy regimen used (Regimen A: chemotherapy (bolus of 5-fluorouracil and leucovorin, days 1-5 and 29-33) + radiotherapy (45 Gy/25 F/1.8 Gy/F); Regimen B: chemotherapy (5-fluorouracil continuous venous infusion +/- weekly bolus of carboplatin or oxaliplatin) + radiotherapy (50.4 Gy/28 F/1.8 Gy/F)), time interval between completion of chemoradiation therapy and surgery, postoperative chemotherapy administration, surgical procedures, pT, pN, and pTNM stage, and response to chemoradiation therapy defined as tumor regression grade, scored from 1 (no tumor on surgical specimen) to 5 (absence of regressive changes). Statistical analysis was performed by means of logistic regression analysis (Cox's model for overall and disease-free survival).
RESULTS:
Median age of the 106 patients was 60 (range, 31-79) years and the male:female ratio, 66:40. Median distance of tumor from the anal verge was 6 (range, 1-11) cm. Pretreatment TNM stage, available in 104 patients, was cT3T4N0, n = 41; cT2N1, n = 9; cT3N1, n = 39; and cT4N1, n = 17. The median radiotherapy dose delivered was 50.4 (range, 40-56) Gy; 58 patients received 5-fluorouracil by continuous venous infusion, and carboplatin with oxaliplatin was added to the chemotherapy schedule in 71 cases. Patients were given Regimen A in 47 cases and Regimen B in 59. The median interval between chemoradiation therapy and surgery was 42.5 (range, 19-136) days, and 94 patients underwent a sphincter-saving procedure. Tumor regression grade, available in 104 cases, was 1, n = 19; 2, n = 18; 3, n = 15; 4, n = 13; and 5, n = 39. At a median follow-up of 42 (range, 1-110) months, 11 patients had died, and 95 were alive. None of the patients had local recurrences, but 13 had distant recurrences. At logistic regression analysis, the chemoradiation therapy regimen used was the only independent predictor of tumor response following preoperative chemoradiation therapy (odds ratio = 0.29, 95% confidence interval = 0.13-0.67, P = 0.003). At Cox's regression analysis, pretreatment T stage was the only independent prognostic factor for both disease-free survival (relative risk = 7.13, 95% confidence interval = 2.3-21.8, P = 0.001) and overall survival (relative risk = 4.83, 95% confidence interval = 1.1-19.9, P = 0.029).
CONCLUSIONS:
Tumor response following preoperative chemoradiation therapy is mainly related to the preoperative regimen used. For patients receiving preoperative chemoradiation therapy, pretreatment T stage, but not tumor response to preoperative chemoradiation therapy, is prognostic for outcome (both disease-free and overall survival)
Histological study of SlNPV infection on body weight and peritrophic membrane damage of Spodoptera litura larvae
No full textSanjaya, Machmudin D, Kurniawati ND. 2010. Kajian histologis infeksi SlNPV terhadap berat badan dan kerusakan
membran peritrofik larva Spodoptera litura. Nusantara Bioscience 2: 135-140. Pengaruh infeksi SlNPV pada berat badan dan kerusakan
membran peritrofik larva Spodoptera litura Fab. telah dilakukan. Metode yang digunakan adalah analisis probit, dan berdasarkan LD 50
virus yang terinfeksi untuk mengetahui berat badan dan kerusakan pasca infeksi. Kerusakan struktur histologi yang disebabkan oleh
infeksi SlNPV (0, 315, 390, 465, 540 dan 615 PIB/mL) diamati setelah 0, 12, 24, 72 dan 96 jam pasca infeksi. Preparasi histologis
dibuat dengan metode parafin setelah fiksasi dengan larutan Bouin, kemudian diiris setebal 7 um dan diwarnai dengan Hematoxilin-
Eosin. Hasil penelitian menunjukkan bahwa paparan SlNPV menyebabkan penurunan konsumsi pangan terutama pada 540 PIB/mL
dengan rata-rata 0.1675 mg. Pengamatan deskriptif pada struktur histologi membran peritrophic yang terkena infeksi SlNPV
menunjukkan kecenderungan kerusakan, sementara pada kontrol tidak ada kerusakan sama sekali. Semakin lama paparan virion di
dalam lumen midgut maka semakin tinggi terjadinya kerusakan membran peritrofik. Kerusakan paling parah terjadi 96 jam setelah
infeksi. Hasilnya membuktikan bahwa virion haNPV dapat menghancurkan struktur histologi midgut.
Kata kunci: SlNPV, Spodoptera litura, LD50, tingkat konsumsi, membran peritrophic
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