Green hydrogen and fuel cell systems

Karakoc, Tahir Hikmet/0000-0001-8182-8667WOS: 000321547900001This special issue consists of original, peer-reviewed articles, most of which were presented at the Sixth International Green Energy Conference (IGEC-6), held in Eskisehir, Turkey, on 5–9 June 2011

Phosphorus and humic acid application alleviate salinity stress of pepper seedling

Humic acid is a commercial product that contains many elements which improve the soil fertility and increase the availability of nutrient elements. It consequently affects plant growth and yield and ameliorates the deleterious effects of salt stress. The objective of the study was to determine the effect of humic acids and phosphorus on growth and nutrient content of pepper seedlings (cv. Demre) grown under moderate salt stress in growth chamber conditions. Applications of different levels of phosphorus [0 (P0), 50 (P1), 100 (P2) and 150 (P3) mg kg-1] and humic acid [0 (HA0), 750 (HA1) and 1500 (HA2) mg kg-1] to growing media containing moderate salt dose (8 mM NaCl treatment) were studied. The study was replicated four times with 20 plants in each replicate. Humic acid (HA) and phosphorus applications increased the growth and growth parameter of plants. In company, effects of HA and P application was more effective on growth and growth parameter than each separate effect. The optimum total yield was obtained from 69 mg kg-1 P application with HA2 doses according to regression analysis. Humic acid application significantly increased N, P, K, Ca, Mg, S, Mn and Cu contents of shoot of pepper seedling. Also, N, P, K, Ca, S, Fe, Mn, Zn and Cu contents of root were increased with humic acid application. Na contents of both shoot and root of pepper decreased with increased humic acid doses. It can be concluded that high humic acid doses has positive effects on salt tolerance based on the plant growth parameters and nutrient contents. The present study suggests that HA treatments can ameliorate the deleterious effects of salt stress on pepper plants and HA could offer an economical and simple application to reduce problems of pepper production in moderately saline soil.Keywords: Nutrient uptake, plant growth parameter, salt stress, pepperAfrican Journal of Biotechnology Vol. 9(36), pp. 5845-5851, 6 September, 201

Spontaneous Herniation of Temporomandibular Joint through the External Auditory Canal

Spontaneous herniation of the temporomandibular joint (TMJ) through the external auditory canal (EAC) is a relatively rare condition. It was first described by Hawke in 1987. In this article, 2 cases with spontaneous herniation of TMJ were reported together with clinical and radiological features, as well as the updated literature.The first case was a 56-year-old female patient, and she applied to our clinic because of itching at the EAC. On physical examination, herniation of the TMJ to the left EAC was detected. On computerized tomography, there was a bony defect at the anterior portion of the left EAC. The second case was a 52-year-old female, and she attended our clinic with sore throat. On routine physical examination, herniation of the TMJ through the left EAC was detected. Both patients were asymptomatic; none of them underwent surgery and follow-up visits were recommended.In the presence of herniation of the TMJ, a bony defect between the posterior wall of the glenoid cavity and anterior part of the EAC should be taken into consideration. Treatment of TMJ herniation through the EAC is controversial, and presence and the degree of the symptoms are the factors which were taken into consideration for management

Letter from the guest editors

According to the International Civil Aviation Organization, the world aviation air traffic has grown by an average yearly rate of 5% over the last thirty years, until the devastating downturn brought on by the COVID crisis of 2020. Regardless of the current situation, there are still a number of issues and challenges that the industry is confronted with, not the least of which are related to sustainability, the conversion to electrical usage, the challenge of increasing propulsion efficiency in conventional propulsion, the digital transformation of the entire ecosystem, etc. In response, system developers and researchers in the field are working on a number of key technologies and methodologies to solve some of these issues. The Sustainable Aviation Research Society (SARES), a global organization that seeks to encourage research in this area and helps disseminate knowledge via conferences and symposia, has been organizing meetings to promote sustainable aviation over the five years. Three of these are the International Symposium on Sustainable Aviation (ISSA), International Symposium on Electric Aviation and Autonomous Systems (ISEAS), and the International Symposium on Aircraft Technology, MRO, and Operations (ISATECH)

Alpha-lipoic acid intoxication in an adolescent girl: Case report and review of the literature

Alpha-lipoic acid is a widely used medication that does not need a prescription. Although it is safely used in adults, hitherto no safe dose for children has been reported, and there is no known antidote. The medical literature provides four reports of alpha-lipoic acid intoxication in the pediatric population to date. This case-report is the lowest known dose of alpha-lipoic acid intake leading to poisoning in a teenager.Alfa-lipoik asit, reçeteleme gerektirmeyen, yaygın olarak kullanılan bir ilaçtır. Yetişkinlerde güvenle kullanılırken çocuklar için güvenli doz aralığı belirlenmemiştir ve bilinen bir antidotu yoktur. Dizinde dört adet alfa lipoik asit zehirlenmnesi olgusu sunulmuştur. Şu ana kadar çocuklarda adet alfa lipoik asit zehirlenmesine neden olan en düşük dozu olgumuzla bildirmekteyizWOS:00058038850001

The Role of Computerized Tomography for the Evaluation of Head Trauma in Children

WOS: 000450536200007Amaç: Kafa travması çocukların acil servise sık başvuru nedenlerindendir. Travma nedeniyle iki yaş altı çocukların bilgisayarlı tomografi gerekliliği açısından değerlendirilmesi oldukça zordur. Bu çalışmanın amacı 2 yaş altı çocukların değerlendirilmesinde gereksiz kranial bilgisayarlı tomografi çekimine dikkat çekmektir. Gereç ve Yöntem: Acil Servise, yaşları 0-24 ay arası olan ve Ocak 2011 ile Aralık 2015 tarihleri arasında gelen kafa travmalı 183 olgunun kayıtları geriye dönük olarak incelenmiştir. Bulgular: Çalışmaya dahil edilen 183 olgunun, 93’ü erkek (%50,8), 90’ı kız (%49,2) ve hastaların yaşları ortalama 13.08±6.30 (en küçük 1, en büyük 24) ay idi. Kazaların 139’u (%76) düşme, 24’ü (%13,1) araç dışı trafik kazası, 20’si (%10,9) araç içi trafik kazası sonucu gerçekleşmişti. Olguların %12’sine kranial bilgisayarlı tomografi çekilmezken, %80’ine çekilmişti. Kranial bilgisayarlı tomografi çekilen hastaların 7’sinde (%3,8) frontal kemikte, 1’inde (%0,5) temporal kemikte, 5’inde (%2,7) oksipital kemikte, 5’inde (%2,7) parietal kemikte kırık saptandı. Hastaların yatış süresi 0.54±2,90 ( en küçük 0, en büyük 27) gün idi. Olguların hiçbirinde operasyon gereksinimi olmadı. Sonuç: İki yaş altı çocuklarda, kafa travmalarında bilgisayarlı tomografi çekilme oranındaki yükseklik dikkat çekici bulundu. Bu çalışma ile özellikle hafif kafa travmalı olgularda bilgisayarlı tomografi istenmesi için doğru endikasyon konulması, daha ayrıntılı ve objektif kriterleri belirleyen çalışmalar ile istemin azaltılması gerekliliği vurgulanmıştır.Objective: Head trauma is the cause of the most common reasons for pediatric emergency admissions. The decision for computerized tomography evaluation after minor head trauma is a challenge for children in nonverbal age. This study aims to draw attention to unnecessary cranial computerized tomography scanning in children under two years of age. Methods: The records of 183 head trauma cases between the ages of 0-24 months and between January 2011 and December 2015 were reviewed retrospectively. Results: Of the 183 patients included in the study, 93 were male (50.8%), 90 were female (49.2%), and the mean age of the patients was 13.08 +/- 6.30 months (the youngest 1 months-of-age, the oldest 24 months-of-age). The distribution of the causes of the head trauma was as follow 139 (76%) accidental, 24 (13,1%) non-vehicle traffic accidents and 20 (10,9%) traffic accidents occurred. Cranial computerized tomography was performed in 80% of the cases. Moreover, was not in 12% of the cases. Patients with cranial computerized tomography had 7% (3.8%) of the frontal bone, 1 (0.5%) temporal bone, 5 (2.7%) occipital bone, and 5 (2.7%) parietal a bone fracture was detected. The duration of hospitalization was 0.54 +/- 2.90 (min 0, max 27) days. None of the cases required an operation. Conclusion: In children under two years of age, the height of computerized tomography withdrawal in head trauma was remarkable. This study emphasizes the necessity of putting the right indications for computerized tomography prompting, especially those with mild head trauma, and reducing the need for more detailed and objective criteria

IGECVI-special issue-Energy and exergy modeling of advance energy systems

Karakoc, Tahir Hikmet Hikmet/0000-0001-8182-8667WOS: 000311873700001Dear Colleagues, Energy and exergy are unifying concepts that extend all sciences, and are of fundamental importance in issues of climate change and environment, and use of energy resources. Exergy analysis is a powerful thermodynamic technique for assessing and improving the efficiency of processes, devices and systems. Exergy applications are observed in various fields, including mechanical and chemical engineering as well as economics, management, physics and biology. Consequently, exergy analysis is used increasingly by industries and governments throughout the world, particularly with the aim of improving energy sustainability. Research and review articles on all facets of exergy and its applications, and on exergy-related topics, are sought for IGEC-VI Special Issue

Exergetic and exergo-economic analysis of a turboprop engine: a case study for CT7-9C

Karakoc, Tahir Hikmet Hikmet/0000-0001-8182-8667;WOS: 000309109900005The turboprop engine has played an important role in short haul commuter and military transport aircraft where high speed is not critical. It may provide the aviation sector with one of the most significant means of achieving reduced operating costs through reductions in fuel consumption. This paper deals with exergo-economic analysis of a modern turboprop engine (CT7-9C) with a free power turbine used for a medium-range twin-engine transport plane that was jointly developed as a regional airliner and military transport. the investigated main components of the engine are the compressor, the combustor, the gas generator, the power turbine and the exhaust. Exergetic parameters, along with exergo-economic parameters, have been calculated for each engine component.Anadolu UniversityAnadolu University; Rize UniversityRecep Tayyip Erdogan University; TUSAS Motor Industry; Turkish Air Force in TurkeyTurkish Air ForceThe authors would like to thank Anadolu University, Rize University, TUSAS Motor Industry and Turkish Air Force in Turkey for their financial, technical and knowledge support