On the Steklov problem involving the p(x)-Laplacian with indefinite weight

Under suitable assumptions, we study the existence of a weak nontrivial solution for the following Steklov problem involving the $p(x)$-Laplacian $$\begin{cases}\Delta_{p(x)}u=a(x)|u|^{p(x)-2}u \quad \text{in }\Omega, \\ |\nabla u|^{p(x)-2}\frac{\partial u}{\partial \nu}=\lambda V(x)|u|^{q(x)-2}u \quad \text{on }\partial \Omega.\end{cases}$$ Our approach is based on min-max method and Ekeland's variational principle

Građevinski materijal kao performansa održive arhitekture u funkciji vrednovanja jedinice susedstva

Evolucija tehnologije materijala u poslednjim decenijama rezultirala je zanimljivim projektima usmerenim na očuvanje životne sredine, energije i smanjenje zagađenja. Načela modelovanja životne sredine uzeta su kao osnova za arhitektonsku misao, počev od ranih faza procesa projektovanja, završavajući odabirom odgovarajućeg građevinskog materijala za postizanje održivih zgrada. Problem je što su ova nastojanja ograničena u našem lokalnom okruženju i nisu shvaćena sa potrebnom ozbiljnošću. Istraživački problem se javlja usled zanemarivanje ekološkog aspekta (ekološkog sistema) prilikom odabira građevinskih materijala tokom procesa projektovanja za postizanje održivih zgrada. Cilj ovog istraživanja je otkrivanje mehanizama odabira građevinskih materijala radi poboljšanja funkcionalnih performansi i smanjenja negativnih uticaja na životnu sredinu i očuvanja njenih resursa i ekoloških sistema što je višemoguće prema ovim pokazateljima. Uvažavanje elemenata kao što su utelovljena energija, recikliranje i trajnost, ima za cilj da pomogne arhitektama i određenim inženjerima u donošenju odluka koje imaju značajan uticaj na postizanje nivoa održivosti objekata u lokalnom okruženju i mogućnost primene u Libiji. Hipoteza istraživanja rezimirana je u činjenici da je u savremenom pristupu projektovanju i rekonstrukciji objekata u građenoj sredini neophodno definisati nove metodološke i projektantske modele materijalizacije usklađene sa principima održive arhitekture. Primenjeni naučni metod je ispitivanje/eksploratorno istraživanje, u kome se preko modaliteta vrednosti posmatranih objekata, analizira predmet istraživanja u cilju provere naučne hipoteze i otkrivanja naučnog doprinosa

Impact of crosstalk into high resistivity silicon substrate on the RF performance of SOI MOSFET

Crosstalk propagation through silicon substrate is a serious limiting factor on the performance of the RF devices and circuits. In this work, substrate crosstalk into high resistivity silicon substrate is experimentally analyzed and the impact on the RF behavior of silicon-on-insulator (SOI) MOS transistors is discussed. The injection of a 10 V peak-to-peak single tone noise signal at a frequency of 3 MHz ( fnoise) generates two sideband tones of *−56 dBm separated by fnoise from the RF output signal of a partially depleted SOI MOSFET at 1 GHz and 4.1 dBm. The efficiency of the introduction of a trap-rich polysilicon layer located underneath the buried oxide (BOX) of the high resistivity (HR) SOI wafer in the reduction of the sideband noise tones is demonstrated. An equivalent circuit to model and analyze the generation of these sideband noise tones is proposed

Resectable gastric signet ring cell carcinoma: clinicopathological characteristics and survival outcomes

Background:Gastric signet ring cell carcinoma (SRCC) appears to have clinical features and survival rates particularly different from other histological types. The aim of this study was to investigate clinicopathological features and survival outcomes of SRCC and to compare them with non-signet ring cell carcinoma (NSRCC).Methods:We retrospectively studied 145 patients with non-metastatic gastric carcinoma who underwent gastrectomy in our institute from 2005 to 2015. Among them, 36 patients (9.4%) with SRCC were compared to 109 patients (90.6%) with NSRCC.Results:Patients with SRCC presented at a younger age (p=0.001) with more advanced stage III-IV disease (p=0.005) and advanced N stages with a higher rate of pN3 (p=0.0001), a higher number of invaded lymph nodes (p=0.002) and a higher rate of patients with a lymph node ratio exceeding 25% (63.9% vs 36.7, p=0.004). After a median follow up of 35.30 months, there was no significant difference in the 5 years overall (OS) survival between SRCC and NSRCC ((36.7% vs 45.7%, p=0.206).However, the 5 years progressive free survival (PFS) was significantly decreased in case of SRCC (38.7% vs 50.9%, p=0.038) with a higher rate of metastasis in (52.9% vs 29.5%, p=0.013) and peritoneal recurrence (35.3% vs 9.5%, p<0.0001). The main prognostic factors of PFS and OS in SRCC were tumoral stenosis, hypoprotidemia, tumor size, depth of invasion (p=0.001), perineural and lymphovascular invasion, the UICC stage and complete surgical resection.Conclusion:Gastric SRCC have a particular clinicopathological behavior compared to NSRCC suggesting its more aggressive character

Determinants of surgical morbidity in gastric cancer: experience of a single center and literature review

Background:This study aimed to evaluate the severity of intraoperative and post-operative complications of gastric cancer surgery and to investigate the predictive factors correlated to surgical morbidity.Methods:We included 145 patients operated for gastric cancer. We investigated the risk factors associated with complications, length of hospital stay, operative time, and intraoperative blood transfusion (BT). Significant risk factors were analyzed by multiple logistic regression analysis.Results:Postoperative complications occurred in 32 patients (22.1 %) and the rate of major complications was 7.6%. The rate of anastomotic fistula was 6.9% and was correlated to diabetes, tumor size, operative time, surgical margin, and extended lymphadenectomy. The mean risk factors for postoperative morbidity were the presence of comorbidities and ASA score (p = 0.021), intraoperative BT (p = 0.045) and prolonged operative time (p = 0.055).Conclusion:Surgical morbidity of gastric cancer is correlated to the extent of resection as well as the clinical and histological characteristics

Evaluation of aerosol optical thickness over Malaysia based on multi-source ground and satellite data

This study evaluates the spatiotemporal distribution of aerosol optical thickness (AOT) over Malaysia. The significance of aerosols in regional and global climate change assessment has become a pressing topic in recent climate discussions. Two different approaches are used in measuring AOT; satellite imagery and ground measurement approaches. However, the satellite approach is deemed the best way for monitoring the patterns and transport of aerosols largely due to its extensive spatial coverage and reliable repetitive measurements. The data in this study were obtained from a Sea-viewing Wide Field-of-view Sensor (SeaWiFS), a Multi-angle Imaging Spectroradiometer (MISR), and Moderate Resolution Imaging Spectroradiometer (MODIS) satellite sensors based on a NASA-operated Giovanni portal. Ground-based Aerosol Robotic Network (AERONET) datasets from two sites over the study area were also used. The results show that the highest AOT ground values of 1.93 and 2.00 were recorded in September 2015, at USM station and Kuching station, respectively. Throughout the 15 years of recorded data, the monthly average value of AOT reached its highest values in September, October, and November. In these months, the value of AOT went above 0.40, unlike in other months of the year. Significantly, the results indicate that Malaysian air quality can be evaluated based on AOT values, as these show the variation in optical properties of aerosol

Impact of Crosstalk into High Resistivity Silicon Substrate on the RF Performance of SOI MOSFET, Journal of Telecommunications and Information Technology, 2010, nr 4

Crosstalk propagation through silicon substrate is a serious limiting factor on the performance of the RF devices and circuits. In this work, substrate crosstalk into high resistivity silicon substrate is experimentally analyzed and the impact on the RF behavior of silicon-on-insulator (SOI) MOS transistors is discussed. The injection of a 10 V peak-to-peak single tone noise signal at a frequency of 3 MHz ( fnoisfnoise) generates two sideband tones of −56 dBm separated by fnoise from the RF output signal of a partially depleted SOI MOSFET at 1 GHz and 4.1 dBm. The efficiency of the introduction of a trap-rich polysilicon layer located underneath the buried oxide (BOX) of the high resistivity (HR) SOI wafer in the reduction of the sideband noise tones is demonstrated. An equivalent circuit to model and analyze the generation of these sideband noise tones is proposed