•A new renewable energy based heating system for buildings is presented.•A mathematical model of the systems is developed using a TRNSYS software.•System components models are validated with ...experimental data.•The system covers 100% of building heating demand.•The yearly average COP higher than 4.8 is achieved.
The Renewable Energy System for Residential Building Heating and Electricity Production (RESHeat) system has been realized for heating and cooling residential buildings. The main components of the RESHeat system are a heat pump, photovoltaic modules, sun-tracking solar collectors and photovoltaic/thermal modules, an underground thermal energy storage unit, and a ground heat exchanger. One of the main novelties of the RESHeat system is efficient ground regeneration due to the underground energy storage unit. During a heating season, a large amount of heat is taken from the ground. The underground energy storage unit allows the restoration of ground heating capability and the heat pump’s coefficient of performance (COP) to be kept high as possible for consecutive years. The paper presents an energy analysis for a residential building that is a RESHeat system demo site, along with integrating the RESHeat system with the building. The experimentally validated components coupled with the building model to achieve the system performance in TRNSYS software. The results show that the yearly average COP of the heat pump is 4.85 due to the underground energy storage unit. The RESHeat system is able to fully cover the heating demand of the building using renewable energy sources and an efficient underground energy storage system.
1950’li yıllardan itibaren gelişen tarım politikası gereği zirai alanların genişletilmesi kapsamında farklı illerde göller kurutulmuştur. Amik Gölü de bu kapsamda kurutulan göllerden birisidir. ...Antakya için bir zamanlar önemli bir yaşam kaynağı olan Amik Gölü kent tarihinde önemli bir yere sahiptir. Geçmişten bu yana su taşkınlarına sebep olan gölün Osmanlı dönemi, Fransız manda yönetimi ve Hatay devleti idaresinde de kurutulması gündeme gelmiştir. Bu girişimler Hatay’ın Türkiye’ye ilhak olmasından sonra da devam etmiştir. Cumhuriyet dönemi içinde 1970’li yıllarda kademeli olarak gölün kurutulması geçmişten bugüne kent gündeminde birçok tartışmayı da beraberinde getirmiştir. Bu çalışma, Amik Gölünün kurutulmasının iktisadi yönüne odaklanan bir bilimsel araştırma projesinin bir parçasıdır. Proje kapsamında detaylı literatür çalışması yapılmış ve bu minvalde geçmişte Antakya ve civarında seyahat eden seyyahların farklı dillerdeki eserleri incelenmiştir. Saha araştırmaları kapsamında eski göl aynası etrafında bulunan Arpahan, Küçükdalyan, Paşaköy, Bakras, Muratpaşa, Torun, Büyükdalyan, Serinyol ve Topboğazı köylerinden 19, gölü ticari olarak işletenler ve yakınlarından iki kişi, kentin kurum ve yöneticilerinden iki kişi olmak üzere toplamda 23 kişi ile etnografik görüşmeler gerçekleştirilmiştir. Çalışma kapsamında, elde edilen bilgiler doğrultusunda gölü kullanan kent sakinlerinin kurutma işlemiyle ilgili görüşlerinin ve kent belleğinde bıraktığı izlerin ortaya koyulması amaçlanmıştır.
This study investigated the potential strategies and related motivation factors that are required for the recruitment and retention of Generation Y, which is the fastest growing segment of today’s ...workforce that has higher expectations compared to previous generations. As Generation Y forms the majority of today's businesses and will have a significant role in shaping the future business world, managers and human resource specialists need effective strategic plans to attract this generation to their business. A survey prepared in the light of the studies in the literature was conducted on 100 human resources specialists and managers from 46 large-scale enterprises registered to the Gaziantep Chamber of Industry and Commerce. The study determined that the work-life balance, training opportunities and team work sub dimension, the leadership and mentoring programs sub dimension and the taking responsibility sub dimension, which motivate Generation Y, have effects on the strategies for the recruiting and retention of Generation Y.
Bu çalışmanın amacı, günümüz işletmelerinin çoğunluğunu oluşturması ve gelecekte iş dünyasının şekillenmesine büyük katkı sağlayacak olması nedeniyle etkili uygulamalara ihtiyaç duyacak olan insan kaynakları ve yöneticilerine, en hızlı büyüyen iş gücü, iş hayatına girmeye başlayan en son kuşak grubu olan ve diğer kuşaklardan farklı olarak iş hayatından yüksek beklentileri olan Y kuşağını işe alma ve işte tutma konusunda ne gibi stratejilere ihtiyaç duyacaklarını ve motivasyonu etkileyen unsurların bu stratejiler üzerindeki etkisini incelemektir. Araştırma amacıyla, Gaziantep ilinde Sanayi ve Ticaret Odasına kayıtlı 80 büyük ölçekli işletmeden 46'sında yer alan 100 insan kaynakları yönetici ve yetkilisine, literatür ışığında hazırlanan anketler uygulanmıştır. Araştırma sonucunda, Y kuşağının motivasyonunu etkileyen “iş yaşam dengesi, eğitim fırsatları ve takım çalışması”, “liderlik ve danışma programları” ve “sorumluluk alma” alt boyutları, onları işe alma ve işte tutma stratejileri üzerinde etkisi olduğu görülmüştür.
The purpose of this study is to determine the effects of the nano-particulate silicon dioxide (SiO2) material on the bending strength and modulus of elasticity in bending of some wood species. ...Oriental beech (Fagus orientalis L.) and sessile oak (Quercus petrea L.) woods species which are commonly used in the furniture industry were used in this study. Impregnation was carried out with the preparation of SiO2 at concentrations of 1% and 3% according to ASTM-D 1413-76 (1976) standards. According to the results, while solution concentration was increasing in both wood species, total retention (kg/m3) and percentage retention (%) values increased; air dry density (12%), bending strength and modulus of elasticity in bending decreased. The maximum mean values of bending strength and modulus of elasticity was in control samples of oriental beech and the minimum were in sessile oak wood with 3% concentration. These results can be related to the fact that the higher density of oriental beech wood (0.630-0.685 g/cm³). In both species of wood, impregnation with SiO2 resulted loss of about 3-5% in bending strength and 0.6-9% in modulus of elasticity.
Chlorophyll meter (SPAD) readings can play an important role in selecting promising lines for wheat breeding. Twenty five durum wheat (Triticum turgidum L. var. durum) genotypes were grown under ...irrigated and rainfed conditions at two locations in Diyarbakir, Turkey during 2005 and 2006. The aim of this study was to evaluate the genetic variation in SPAD readings, and to determine relationships among SPAD readings, grain yield, grain quality and yield parameters. SPAD readings were taken at heading and grain middle milky stages. SPAD readings exhibited greater genotypic variance compared with grain yield and protein content. Genotype by environment interaction variance did not associate with SPAD readings and, grain yield. At both measuring stages there were positive correlations between SPAD and grain yield. Correlation analysis revealed that grain yield under both rainfed and irrigated conditions was mostly determined by grain number. These results suggest that SPAD readings can be used as selection criteria to select durum wheat genotypes that are high yielding but without any decrease in grain protein content.
A great amount of energy is wasted in industry by machines that remain idle due to underutilisation. A way to avoid wasting energy and thus reducing the carbon print of an industrial plant is to ...consider minimisation of energy consumption objective while making scheduling decisions. To minimise energy consumption, the decision maker has to decide the timing and length of turn off/turn on operation (a setup) and also provide a sequence of jobs that minimises the scheduling objective, assuming that all jobs are not available at the same time. In this paper, a framework to solve a multiobjective optimisation problem that minimises total energy consumption and total tardiness is proposed. Since total tardiness problem with release dates is an NP-hard problem, a new greedy randomised multiobjective adaptive search metaheuristic is utilised to obtain an approximate pareto front (i.e. an approximate set of non-dominated solutions). Analytical Hierarchy Process is utilised to determine the 'best' alternative among the solutions on the pareto front. The proposed framework is illustrated in a case study. It is shown that a wide variety of dispersed solutions can be obtained via the proposed framework, and as total tardiness decreases, total energy consumption increases.
Objective: In this study, we aimed to evaluate the relationship between the laboratory parameters of mean platelet volume/lymphocyte ratio (MPVLR) and mean platelet volume/platelet ratio (MPVPR) with ...prognosis and mortality in patients with hospitalized glomerular filtration rate (GFR) <60 and a diagnosis of acute myocardial infarction (AMI). Method: This study was designed as a retrospective cohort study. Two hundred myocardial infarction (MI) patients over the age of 18 years and with GFR <60, who were hospitalized in our hospital between January 01, 2018 and January 01, 2021, were included in the study. The patients were divided into 2 groups, as the survivor and mortality groups. The two groups were compared in terms of demographic characteristics and clinical data (symptoms, comorbidities, laboratory findings, GFR, coronary angiography, drugs used and complications). MPVLR was found by dividing the mean platelet volume to lymphocyte count. MPVPR was found by dividing the mean platelet volume to platelet count. Results: The mean age of the survivor group was 64.3±10.4. In the mortality group, the mean age was 70.02±9.3. MPVLR levels were statistically significantly higher in the mortality group (8.39±5.9) compared to the survivor group (6.58±5.4) (p=0.011). However, MPVPR levels were statistically significantly lower in the mortality group (0.041±0.01) compared to the survivor group (0.044±0.01) (p=0.048). According to the results of ROC analysis in patients with mortality, sensitivity was 50.0% and specificity was 68.6% for MPVLR (p=0.010); sensitivity was 41.0% and specificity was 47.9% for MPVPR. The risk factors found to be significantly associated with mortality in the regression analysis included MPVPR β: 0.045, odds ratio (95% confidence interval): 0.945 (0.899- 1.001), p=0.032. Conclusion: As inexpensive and easily available new inflammatory markers, MPVLR and MPVPR were significantly higher in patients with GFR <60 and in those who died from AMI. In addition, MPVLR and MPVPR could predict mortality from MI.
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