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On the vague DeMorgan complemented partially ordered sets and lattices
Eken 장전수학회 2009 Advanced Studies in Contemporary Mathematics Vol.19 No.2
Lattice theory is a basic topic of mathematics and many application areas. It is important and useful to fuzzily de¯ne the concepts in lattice theory. Therefore, this work contributes to mathematics in the following way: In this work, fuzzy partially ordered sets and fuzzy lattices that are many-valued logical counterparts to partially ordered sets and lattices in classical lattice theory have been studied on the basis of many-valued equivalence relations. Fuzzy DeMorgan complemented partially ordered sets and lattices are introduced by using many- valued equivalence relations. Furthermore, various non-trivial examples for these concepts are provided.
The effect of sweep angle on the limit cycle oscillations of aircraft wings
Eken, Seher,Kaya, Metin Orhan Techno-Press 2015 Advances in aircraft and spacecraft science Vol.2 No.2
This study focuses on the limit cycle oscillations (LCOs) of cantilever swept-back wings containing a cubic nonlinearity in an incompressible flow. The governing aeroelastic equations of two degrees-of-freedom swept wings are derived through applying the strip theory and unsteady aerodynamics. In order to apply strip theory, mode shapes of the cantilever beam are used. The harmonic balance method is used to calculate the frequencies of LCOs. Linear flutter analysis is conducted for several values of sweep angles to obtain the flutter boundaries.
Kingsley Ekene Nwagu1,Imo A. Ekpo,Benjamin Utip Ekaluo,Godwin Michael Ubi,Munachimso Odinakachi Elemba,Uzoh Chukwuma Victor 한국미생물·생명공학회 2019 한국미생물·생명공학회지 Vol.47 No.4
In this study we attempted to screen bacteria and fungi that generate electricity while treating wastewater using optimized double-chamber microbial fuel cell (MFC) system parameters. Optimization was carried out for five best exoelectrogenic isolates (two bacteria and three fungi) at pH values of 6.0, 7.5, 8.5, and 9.5, and temperatures of 30, 35, 40, and 45℃; the generated power densities were measured using a digital multimeter (DT9205A). The isolates were identified using molecular characterization, followed by the phylogenetic analysis of isolates with known exoelectrogenic microorganisms. The bacterium, Proteus species, N6 (KX548358.1) and fungus, Candida parapsilosis, S10 (KX548360) produced the highest power densities of 1.59 and 1.55 W/m2 (at a pH of 8.5 and temperatures of 35 and 40℃) within 24 h, respectively. Other fungi— Clavispora lusitaniae, S9 (KX548359.1) at 40℃, Clavispora lusitaniae, S14 (KX548361.1) at 35℃—and bacterium— Providencia species, N4 (KX548357.1) at 40℃—produced power densities of 1.51, 1.46, and 1.44 W/m2, respectively within 24 h. The MFCs achieved higher power densities at a pH of 8.5, temperature of 40℃ within 24 h. The bacterial isolates have a close evolutionary relationship with other known exoelectrogenic microorganisms. These findings helped us determine the optimal pH, temperature, evolutionary relationship, and exoelectrogenic fungal species other than bacteria that enhance MFC performance.
( Kingsley Ekene Nwagu ),( Imo A. Ekpo ),( Benjamin Utip Ekaluo ),( Godwin Michael Ubi ),( Munachimso Odinakachi Elemba ),( Uzoh Chukwuma Victor ) 한국미생물 · 생명공학회 2019 한국미생물·생명공학회지 Vol.47 No.4
In this study we attempted to screen bacteria and fungi that generate electricity while treating wastewater using optimized double-chamber microbial fuel cell (MFC) system parameters. Optimization was carried out for five best exoelectrogenic isolates (two bacteria and three fungi) at pH values of 6.0, 7.5, 8.5, and 9.5, and temperatures of 30, 35, 40, and 45℃; the generated power densities were measured using a digital multimeter (DT9205A). The isolates were identified using molecular characterization, followed by the phylogenetic analysis of isolates with known exoelectrogenic microorganisms. The bacterium, Proteus species, N6 (KX548358.1) and fungus, Candida parapsilosis, S10 (KX548360) produced the highest power densities of 1.59 and 1.55 W/m<sup>2</sup> (at a pH of 8.5 and temperatures of 35 and 40℃) within 24 h, respectively. Other fungi― Clavispora lusitaniae, S9 (KX548359.1) at 40℃, Clavispora lusitaniae, S14 (KX548361.1) at 35℃―and bacterium― Providencia species, N4 (KX548357.1) at 40℃―produced power densities of 1.51, 1.46, and 1.44 W/m<sup>2</sup>, respectively within 24 h. The MFCs achieved higher power densities at a pH of 8.5, temperature of 40℃ within 24 h. The bacterial isolates have a close evolutionary relationship with other known exoelectrogenic microorganisms. These findings helped us determine the optimal pH, temperature, evolutionary relationship, and exoelectrogenic fungal species other than bacteria that enhance MFC performance.
Nwagu, Kingsley Ekene,Ekpo, Imo A.,Ekaluo, Benjamin Utip,Ubi, Godwin Michael,Elemba, Munachimso Odinakachi,Victor, Uzoh Chukwuma The Korean Society for Microbiology and Biotechnol 2019 한국미생물·생명공학회지 Vol.47 No.4
In this study we attempted to screen bacteria and fungi that generate electricity while treating wastewater using optimized double-chamber microbial fuel cell (MFC) system parameters. Optimization was carried out for five best exoelectrogenic isolates (two bacteria and three fungi) at pH values of 6.0, 7.5, 8.5, and 9.5, and temperatures of 30, 35, 40, and 45℃; the generated power densities were measured using a digital multimeter (DT9205A). The isolates were identified using molecular characterization, followed by the phylogenetic analysis of isolates with known exoelectrogenic microorganisms. The bacterium, Proteus species, N6 (KX548358.1) and fungus, Candida parapsilosis, S10 (KX548360) produced the highest power densities of 1.59 and 1.55 W/m<sup>2</sup> (at a pH of 8.5 and temperatures of 35 and 40℃) within 24 h, respectively. Other fungi-Clavispora lusitaniae, S9 (KX548359.1) at 40℃, Clavispora lusitaniae, S14 (KX548361.1) at 35℃-and bacterium-Providencia species, N4 (KX548357.1) at 40℃-produced power densities of 1.51, 1.46, and 1.44 W/m<sup>2</sup>, respectively within 24 h. The MFCs achieved higher power densities at a pH of 8.5, temperature of 40℃ within 24 h. The bacterial isolates have a close evolutionary relationship with other known exoelectrogenic microorganisms. These findings helped us determine the optimal pH, temperature, evolutionary relationship, and exoelectrogenic fungal species other than bacteria that enhance MFC performance.
RIEMANNIAN SUBMERSIONS WHOSE TOTAL SPACE IS ENDOWED WITH A TORSE-FORMING VECTOR FIELD
Meric, Semsi Eken,Kilic, Erol Korean Mathematical Society 2022 대한수학회논문집 Vol.37 No.4
In the present paper, a Riemannian submersion 𝜋 between Riemannian manifolds such that the total space of 𝜋 endowed with a torse-forming vector field 𝜈 is studied. Some remarkable results of such a submersion whose total space is Ricci soliton are given. Moreover, some characterizations about any fiber of 𝜋 or the base manifold B to be an almost quasi-Einstein are obtained.
Malaria Endemicity in the Rural Communities of Ebonyi State, Nigeria
Nwele, David Ekene,Onyali, Ikechukwu Oliver,Iwueze, Milliam Okwudili,Elom, Michael Okpara,Uguru, Ogbonna Elom Sabastian The Korea Society for Parasitology and Tropical Me 2022 The Korean Journal of Parasitology Vol.60 No.3
Malaria remains a global health threat. Approximately 97% of the population is at risk in sub-Saharan countries, particularly Nigeria. This study compared the performance of 2 diagnostic methods in assessing malaria endemicity in the rural communities of Ebonyi State, Nigeria. A total of 1,140 study participants were screened for malaria parasite using Rapid Diagnostic Test kits (RDT) in the field, while thick and thin films for microscopy were examined in the laboratory. Our result showed that malaria prevalence was 56.8 by RDT and 38.6% by microscopic test. Age group under 10 years had the highest prevalence of 28.9% (RDT) and 23.6% (microscopy), respectively. The highest prevalence of 19.5% by RDT was recorded in Onicha Local Government Area, while the highest prevalence of 13.4% with microscopy was recorded in Ezza North Local Government Area. The sensitivity and specificity of microscopic examination were both 100%, while those of RDT were 95.5% and 75.9%, respectively.
GENERALIZED SASAKIAN SPACE FORMS ON W<sub>0</sub>-CURVATURE TENSOR
( Tu˘gba Mert ),( Mehmet Atc¸eken ) 호남수학회 2023 호남수학학술지 Vol.45 No.2
In this article, generalized Sasakian space forms are investigated on W<sub>0</sub> -curvature tensor. Characterizations of generalized Sasakian space forms are obtained on W<sub>0</sub>-curvature tensor. Special curvature conditions established with the help of Riemann, Ricci, concircular, projective curvature tensors are discussed on W<sub>0</sub>-curvature tensor. With the help of these curvature conditions, important characterizations of generalized Sasakian space forms are obtained. In addition, the concepts of W<sub>0</sub>-pseudosymmetry and W<sub>0</sub> -Ricci pseudosymmetry are defined and the behavior according to these concepts for the generalized Sasakian space form is examined.
BRIEF COMMUNICATION : Solitary Rectal Ulcer Syndrome in Children: A Report of Six Cases
( Nafiye Urganc ),( Derya Kalyoncu ),( Kamile Gulcin Eken ) The Editorial Office of Gut and Liver 2013 Gut and Liver Vol.7 No.6
Solitary rectal ulcer syndrome (SRUS) is a rare, benign dis-order in children that usually presents with rectal bleeding, constipation, mucous discharge, prolonged straining, tenes-mus, lower abdominal pain, and localized pain in the perine-al area. The underlying etiology is not well understood, but it is secondary to ischemic changes and trauma in the rectum associated with paradoxical contraction of the pelvic floor and the external anal sphincter muscles; rectal prolapse has also been implicated in the pathogenesis. This syndrome is diagnosed based on clinical symptoms and endoscopic and histological findings, but SRUS often goes unrecognized or is easily confused with other diseases such as inflammatory bowel disease, amoebiasis, malignancy, and other causes of rectal bleeding such as a juvenile polyps. SRUS should be suspected in patients experiencing rectal discharge of blood and mucus in addition to previous disorders of evacuation. We herein report six pediatric cases with SRUS. (Gut Liver 2013;7:752-755)