Application of Multi Objective HFAPSO algorithm for Simultaneous Placement of DG, Capacitor and Protective Device in Radial Distribution Network

In this paper, simultaneous placement of distributed generation, capacitor bank and protective devices are utilized to improve the efficiency of the distribution network. The objectives of the problem are reduction of active and reactive power losses, improvement of voltage profile and reliability indices and increasing distribution companies’ profit. The combination of firefly algorithm, particle swarm optimization and analytical hierarchy process is proposed to solve the multi-objective allocation problem. The proposed method is implemented on IEEE 69-bus and also an actual 22-bus distribution systems in Tehran-Iran. Test results approve the effectiveness of the proposed method for improved reliability and network performance of the distribution network

Prediction of cyberchondria based on components of anxiety sensitivity and intolerance of uncertainty among students of Tabriz universities in 2015

زمینه و هدف: جستجوی اینترنتی اطلاعات پزشکی، جز فعالیت های متداول به شمار می رود. اخیراً پژوهشگران شروع به مطالعه درباره چرخه‌ ای آزار دهنده از نگرانی های مرتبط با سلامت جسمانی و جستجوی اینترنتی اطلاعات پزشکی تحت عنوان «سایبرکندوریا» کرده اند. هدف از مطالعه حاضر معرفی حساسیت اضطرابی و عدم تحمل بلاتکلیفی به عنوان 2 پیش بین مهم برای سایبرکندوریا است. روش بررسی: در این مطالعه توصیفی- تحلیلی که بین دانشجویان دانشگاه‌ های تبریز (سراسری تبریز و پیام نور) در سال 1394 انجام شد؛ 228 نفر (154 نفر پسر و 74 نفر دختر) به روش نمونه گیری در دسترس انتخاب شده و به پرسش نامه شدت سایبرکندوریا، مقیاس حساسیت اضطرابی و مقیاس عدم تحمل بلاتکلیفی پاسخ دادند. برای تحلیل داده ها از روش همبستگی پیرسون و تحلیل رگرسیون استفاده شد. یافته ها: یافته ها نشان داد که حساسیت اضطرابی و عدم تحمل بلاتکلیفی همبستگی نسبتاً بالایی با سایبرکندوریا دارند. از میان مولفه های حساسیت اضطرابی، نگرانی های بدنی و نگرانی های شناختی توان پیش بینی سایبرکندوریا را داشتند؛ همچنین هر 2 مولفه عدم تحمل بلاتکلیفی، یعنی IU بازدارنده و IU آینده نگرانه به خوبی توانستند علائم سایبرکندوریا را پیش بینی کنند. نتیجه گیری: یافته های این پژوهش بر اهمیت حساسیت اضطرابی و عدم تحمل بلاتکلیفی در شکل گیری و تداوم سایبرکندوریا صحه گذاشت؛ بنابراین این 2 عامل را می توان به عنوان ریسک فاکتورهای مهمی برای سایبرکندوریا مطرح کرد

A cost-effective and efficient framework to determine water quality monitoring network locations

A crucial part in designing a robustwater qualitymonitoring network is the selection of appropriatewater quality sampling locations. Due to cost and time constraints, it is essential to identify and select these locations in an accurate and efficientmanner. Themain contribution of the present article is the development of a practical methodology for allocating critical sampling points in present and future conditions of the non-point sources under a case study of the Khoywatershed in northwest Iran,where financial resources andwater quality data are limited. To achieve this purpose, the rivermixing lengthmethod (RML)was applied to propose potential sampling points. A new non-point source potential pollution score (NPPS) was then proposed by the analytic network process (ANP) to classify the importance of each sampling point prior to selecting the most appropriate locations for a river system. In addition, an integrated cellular automata–Markov chainmodel (CA–Markov)was applied to simulate future change in non-point sources during the period 2026–2036. Finally, by considering anthropogenic activities through land-usemapping, the hierarchy value, the non-point source potential pollution score values and budget deficiency in the study area, the seven sampling pointswere identified for the present and the future. It is not expected, however, that the present location of the proposed sampling pointswill change in the future due to the forthcoming changes in non-point sources. The current study provides important insights into the design of a reliable water quality monitoring network with a high level of assurance under certain changes in non-point sources. Furthermore, the results of this study should be valuable for water quality monitoring agencies looking for a cost-effective approach for selecting sampling locations

Geochemistry of hydrothermal alterations associated with epithermal gold mineralization in Masjeddaghi area, east of Jolfa, NW Iran

Two types of mineralization including porphyry copper and epithermal gold mineralization have occurred in relation with an intermediate volcano-plutonic complex in Masjeddaghi area. Different alterations including silica, advanced argillic, intermediate argillic and propylitic have been distinguished in relation with epithermal mineralization, which have a zonal pattern. Elemental mass gains and losses during alterations were calculated using Zr as an immobile monitor. Silica zone has enriched in SiO2 and relatively in Al2O3 and K2O, and has depleted in Na2O, MgO and CaO. Ba, Sr, Pb, Rb and Cu elements have also enriched. The advanced argillic zone shows enrichment in SO3, Al2O3, SiO2, K2O, MgO and L.O.I; and depletion in Fe2O3, CaO, Na2O, MnO and MgO. Barium, Cu, Sr and Zn have depleted in this zone. Propylitic zone has enriched in MgO, CaO, L.O.I and SiO2, and has depleted in Na2O and K2O. Geochemical and mineralogical evidences indicate that the hydrothermal leaching of mafic minerals in parent rocks and formation of quartz, kaolinite, sericite and alunite assemblage in advanced argillic zone; and chlorite, epidote and calcite assemblage in propylitic zone is responsible for the above mentioned chemical variations. It is likely that the gains and losses of elements have been controlled by agents such as water/rock ratios, temperature changes and chemistry of hydrothermal solutions. The CIA and MIA indicators in the altered rocks indicate the intensity of alteration in silica and advanced argillic zones in comparison with propylitic zone

The utility of syndecan-1 circulating levels as a biomarker in patients with previous or active COVID-19: a systematic review and meta-analysis

Abstract Background With the emergence of coronavirus disease of 2019 (COVID-19), several blood biomarkers have been identified, including the endothelial biomarker syndecan-1, a surface proteoglycan. In the current systematic review and meta-analysis, we aimed to assess the diagnostic and prognostic role of syndecan-1 in COVID-19. Methods PubMed, Embase, Scopus, and Web of Science, as international databases, were searched for relevant studies measuring blood syndecan-1 levels in COVID-19 patients, COVID-19 convalescents, and healthy control subjects, in patients with different COVID-19 severities and/or in COVID-19 patients with poor outcomes. Random-effect meta-analysis was performed using STATA to calculate the standardized mean difference (SMD) and 95% confidence interval (CI) for the comparison between COVID-19 patients and healthy control subjects or COVID-19 convalescents and controls. Results After screening by title/abstract and full text, 17 studies were included in the final review. Meta-analysis of syndecan-1 levels in COVID-19 compared with healthy control subjects revealed that patients with COVID-19 had significantly higher syndecan-1 levels (SMD 1.53, 95% CI 0.66 to 2.41, P < 0.01). In contrast, COVID-19 convalescent patients did not show significant difference with non-convalescents (SMD 0.08, 95% CI -0.63 to 0.78, P = 0.83). Regarding disease severity, two studies reported that more severe forms of the disease were associated with increased syndecan-1 levels. Moreover, patients who died from COVID-19 had higher syndecan-1 levels compared with survivors (SMD 1.22, 95% CI 0.10 to 2.33, P = 0.03). Conclusion Circulating syndecan-1 level can be used as a biomarker of endothelial dysfunction in COVID-19, as it was increased in COVID-19 patients and was higher in more severe instances of the disease. Further larger studies are needed to confirm these findings and further enlighten the role of syndecan-1 in clinical settings