bluuebunny/crossref_metadata_2025 huggingface dataset:
Oxidation Behavior at 1173 K of Modified P/M Stainless Steel 316 L by Addition of Cr, Ni, and Cr with Ni
Authors: Polsen Yada , Wangyao Panyawat , Chuankrerkkul Nutthita , Visuttipitukul Patama , Tongsri Ruangdaj , Lothongkum Gobboon
Published: April 2021

Specimens of P/M 316 L stainless steel and modified P/M 316 L stainless steel with various amounts of Cr, Ni, and Cr along with Ni additions were compressed by a 500 MPa-hydraulic press for a duration of 30 s and then sintered at 1573 K in a hydrogen atmosphere for 2.7 ks. The oxidation resistance tests of those specimens were carried out at 1173 K in air for 360 ks. The 5 wt.-% Cr-added specimen resulted in the best oxidation resistance with the lowest oxidation rate constant of 1.54 × 10-7 kg2 × m-4 × s-1. The oxidation products which formed inside the pores and on the surfaces of all specimens were analyzed using scanning electron microscope/energy dispersive spectroscopic (SEM/EDS) and X-ray diffraction (XRD) analysis techniques. The results show that the oxides forming on both inside pores and surfaces were identified as Cr2O3, Fe2O3, (Fe0.6Cr0.4)2O3, NiFe2O4 and NiCr2O4 in all tested conditions. The measured hardness of the modified specimens was in the range of 87-92 HRB, compared to the hardness of the 316 L specimen, which was 93 HRB. Increasing the amount of powder added provided a slightly lower hardness value due to increased porosity.
Effect of graphene nanoplatelet filling on mechanical properties of natural fiber reinforced polymer composites
Authors: Erdoğdu Yusuf Eren , Korkmaz Engin Eren , Temiz Şemsettin
Published: April 2021

In this study, the mechanical properties of plain woven jute-epoxy composite materials were investigated after filling graphene nanoplatelets (GNPs) in different proportions. The time dependent changes in the viscosity and temperature of unfilled epoxy resin, with 0.5, 1 and 2 wt.-% graphene nanoplatelets filled epoxy resins were observed. Woven jute reinforced unfilled, 0.5 wt.-% GNPs filled and 1 wt.-% GNPs filled epoxy composite plates were produced by using vacuum assisted resin transfer molding (VARTM) at the same waiting and processing times. Specimens were prepared and subjected to tensile and flexural tests according to ASTM D 3039 and ASTM D 790 standards, respectively. Images were taken and evaluated with a scanning electron microscope (SEM) in areas where tensile damage occurred. It was observed that the gap amount between the fiber and the matrix increased and the interface adhesion decreased as the fill amount increased in the composites produced. The testing results indicated that the tensile and flexural properties of composites decreased at 0.5 wt.-% and 1 wt.-% during the GNPs loading as compared to unfilled composites.
Fatigue life evaluation of an electrically driven shuttle frame using finite element analysis
Authors: Sener Arif Senol
Published: April 2021

This article provides the fatigue life estimation of the frame of a new electrically powered shuttle used in airports and resorts. The frame and components of the electrically powered shuttle were designed by expert employers of the OSCAR Co. using a CATIA computer program. Accelerometers were mounted under and above the prototype electric vehicle frame and external load path interaction data were collected by road tests. By means of five varied degrees of road roughness and three different conditions for vehicle loading, the raw road data were recorded via accelerometers on the vehicle frame. The recorded raw data was made available by processing with the FDesign program. After the external load was determined, a 3D drawing of the frame of the vehicle was transferred to the ANSYS program as a step file. In the chassis model transferred to the ANSYS program; material assignment, meshing of the frame structure, defining the boundary conditions of the structure and static analysis were determined according to the most critical road load, following which fatigue analyses were performed for five different roads. The fatigue life and damage amount of each road on the vehicle frame were calculated separately by considering Miner’s rule according to the S-N high cycle method. Experiments showed that no fatigue damage occurred within the predicted 200,000 km.
Thermo-mechanical analysis of a FGM plate subjected to thermal shock – A new numerical approach considering real time temperature dependent material properties
Authors: Kaman Mete Onur , Celik Nevin , Das Resul
Published: April 2021

In present the study, sudden cooling, in other words thermal shock, is applied to a plate that is originally a functionally graded material (FGM). The flat plate is assumed to have an edge crack on it. Hence a numerical couple-field analysis is performed on the plate. The FGM is a combination of Ni and Al2O3. The thermal and mechanical properties of the FGM are assumed to depend on temperature variation. The mixing percentages of the Ni and Al2O3 throughout the plate are considered to vary (i) linearly, (ii) quadratically and (iii) in half-order. In order to solve the problem, a new subroutine depending on temperature is written using APDL (ANSYS Parametric Design Language) codes. Three values of the heat transfer coefficient are applied to the initially heated plate. As a result, the transient temperature variation and stress intensity factor are presented to show the thermo-mechanical relation of the plate. The material properties changing with temperature results in more reliable temperature values. Increasing the heat transfer coefficient results in better cooling and in a lesser amount of time to reach ambient air temperature.
Comparision of the political optimization algorithm, the Archimedes optimization algorithm and the Levy flight algorithm for design optimization in industry
Authors: Yıldız Betül Sultan , Pholdee Nantiwat , Bureerat Sujin , Erdaş Mehmet Umut , Yıldız Ali Rıza , Sait Sadiq M.
Published: April 2021

This article focuses on minimizing product costs by using the newly developed political optimization algorithm (POA), the Archimedes ‘optimization algorithm(AOA), and the Levy flight algorithm(LFA) in product development processes. Three structural optimization methods, size optimization, shape optimization, and topology optimization, are extensively applied to create inexpensive structures and render designs efficient. Using size, shape, and topology optimization in an integrated way, It is possible to obtain the most efficient structures in industry. The political optimization algorithm (POA) is a metaheuristic algorithm that can be used to solve many optimization problems. This study investigates the search capability and computational efficiency of POA for optimizing vehicle structures. By examining the results obtained, we prove the apparent superiority of the POA to other recent famous metaheuristics such as the Archimedes optimization algorithm and the Levy flight algorithm. The most important result of this paperwill be to provide an impressive aid for industrial companies to fill the gaps in their product design stages.
Optimization of flexural and impact properties of r-LDPE-DPWF composite for printer parts production
Authors: Government Rabboni Mike , Okeke Edozie Thompson , Thaddaeus Julius , Onukwuli Okechukwu Dominic
Published: April 2021

The circulation of recycled low density polyethylene (r-LDPE) globally, using Nigeria as point of reference is emphasized in this work. The need for combining r-LDPE with a less expensive organic fiber as an economical alternative material in panel production for printer component to reduce waste through recycling. In this study, the particle size (PS) and fiber content (FC) of date palm wood fiber (DPWF) in a r-LDPE matrix are essential factors to be considered for optimizing flexural strength (FS), flexural modulus (FM) and Izod impact strength (IIS) of r-LDPE-DPWF (recycled low density polyethylene-date palm wood fiber) composite for producing printer components. The variant FC and PS of the DPWF was compounded in r-LDPE matrix to optimize the FS, FM and IIS of r-LDPE-DPWF composite, using a central composite design (CCD) as a response surface methodology (RSM). The DPWF and r-LDPE-DPWF composite were analyzed by Fourier transformed infrared (FTIR). The results indicated that the FS, FM and IIS of r-LDPE-DPWF composite measured 46.66002 MPa, 1.150043 GPa and 1.99899 KJ × m-1 at optimal operation, respectively. Under these operating conditions, PS and FC were 60.78 mesh (250 μm) and 30 wt.-%, respectively. Finally, the main coefficient of determination (R2) for the factors correlated with the characteristics of the r-LDPE-DPWF composite at an approximate value of 1 with a differential error of RSM and experiment values < 0.05 %. It was concluded that the RSM model yielded the necessary parameters for the r-LDPE-DPWF composite to be considered as a potential material for printer components.
Evaluation methods for estimation of Weibull parameters used in Monte Carlo simulations for safety analysis of pressure vessels
Authors: Wang Bin , Islam Faisal , Mair Georg W.
Published: April 2021

The test data for static burst strength and load cycle fatigue strength of pressure vessels can often be well described by Gaussian normal or Weibull distribution functions. There are various approaches which can be used to determine the parameters of the Weibull distribution function; however, the performance of these methods is uncertain. In this study, six methods are evaluated by using the criterion of OSL (observed significance level) from Anderson-Darling (AD) goodness of Fit (GoF), These are: a) the norm-log based method, b) least squares regression, c) weighted least squares regression, d) a linear approach based on good linear unbiased estimators, e) maximum likelihood estimation and f) method of moments estimation. In addition, various approaches of ranking function are considered. The results show that there are no outperforming methods which can be identified clearly, primarily due to the limitation of the small sample size of the test data used for Weibull analysis. This randomness resulting from the sampling is further investigated by using Monte Carlo simulations, concluding that the sample size of the experimental data is more crucial than the exact method used to derive Weibull parameters. Finally, a recommendation is made to consider the uncertainties of the limitations due to the small size for pressure vessel testing and also for general material testing.
Experimental Study on the Stress-Strain Behavior of Self-Compacting Concrete Modified by Waste Rubber under Uniaxial Tension with Acoustic Emission Technique
Authors: Liu Zhiheng , Chen Xudong , Chen Bo , Cheng Xiyuan
Published: April 2021

Tensile characteristics of concrete play an important role in structures. In this paper, the stress-strain behavior of self-compacting concrete modified by waste tire rubber (rubberized self-compacting concrete [RSCC]) under uniaxial tension is researched. Both monotonic and cyclic tests are conducted for RSCC with different rubber contents. The results demonstrate that the incorporation of rubber aggregate results in a lower uniaxial tensile strength but an improved deformation resistance, a high energy-dissipating ability, and a lower stiffness deteriorating rate. The acoustic emission (AE) technique is employed to detect the damage progression. Although the AE signals decrease with the increase of AE signals, the damage can be well represented by a relatively high emitting rate of AE signals. Furthermore, the load ratio, calm ratio, and relaxation ratio are used to characterize the damage development. It is found that the incorporation of rubber aggregate results in a complicated cracking behavior of specimen under uniaxial tension.
Molecular detection of glutamate dehydrogenase gene of Giardia lamblia isolated from food handlers in Erbil city
Authors: Saber Hataw , Bakr Hawri
Published: April 2021

Background and objective: Giardia lamblia is the intestinal flagellated protozoan parasite that infects vertebrates, including humans. Giardiasis is the major diarrheal disease found worldwide. It can be symptomatic or may be an asymptomatic carrier that led to chronic disease. This study aimed to determine the proportion of giardiasis among food handlers and evaluate the correlation between two laboratory methods for identifying the Giardia lamblia. Methods: A total of 308 stool samples were collected from food handlers that annually attend the central laboratory in Erbil City. Wetmount microscopic examination was performed for the diagnosis of cysts and trophozoites of the Giardia parasite. Molecular analysis done for positive samples, DNA extraction performed using the QIAamp Fast DNA Stool Mini Kit (Qiagen Company, Germany). Nested PCR analysis was done targeting the Glutamate dehydrogenase gene using two sets of primers for amplification of 734bp fragment. Gel electrophoresis was performed for visualizing the amplified DNA by Ultraviolet light. Results: The mean age of food handler participants was 29 years. Most (93.8%) of the food handlers were males, and the majority (98.6%) of the participants did not have any signs and symptoms. Four (7.4%) microscopy positive sample participants were highly educated. There was no association between educational level and positive rate by microscopy (P = 0.066). The majority of participants did not receive treatments, particularly most of the microscopic positive samples. The food handlers did not take any antiparasitic treatments 9 (3.4%) (P = 0.676). From 11 (3.6%) microscopically positive samples, 10 (90.9%) Giardia lamblia gdh gene 734 bp fragments were amplified by nested PCR. Conclusion: Amplification of 734bp of gdh gene by the nested PCR is the most specific and sensitive method for identifying Giardia lamblia. Food handlers were important people to care about sanitation and preparing food, particularly for avoiding diseases transmitted by food. Keywords: Giardiasis; Genetic characterization; gdh gene; Nested PCR.
Isolation and genotyping of Candida albicans involved in vaginal candidiasis among pregnant women in Sulaymaniyah and Erbil cities
Authors: Mustafa Khattab
Published: April 2021

Background and objective: Vaginal candidiasis is a common infection among pregnant women. The current study aimed to investigate the etiologic species of vaginal candidiasis and the genotypes of C. albicans isolated from vaginal samples among pregnant women in the Kurdistan region of Iraq. Methods: Vaginal swabs were collected from pregnant women admitted to the Maternity hospital in Sulaymaniyah and Erbil cities from March 2016 to December 2018. Candida isolates were identified on CHROMagar medium, then confirmed with PCR depending on ITS region. All C. albicans isolates were confirmed using chitin synthase gene (CHS1) and subjected to genotypic analysis based on the transposable intron in 25S rDNA with using CA25S and CA-INT primers. DNA sequencing of 25S rDNA region was done by using CA and CA-INT primers. Results: Among 340 women tested, 114 (33.53%) were positive for vaginal candidiasis. Five Candida species were identified, where they are C. albicans (56.14%), C. glabrata (24.56%), C. kefyr (11.40%), C. tropicalis (5.27%) and C. krusei (2.63%). It has been found that C. albicans significantly (P <0.01) higher than non-albicans species. The genotypes A (450 bp), B (840 bp), and C (450 and 840 bp) of C. albicans were detected. The Genotype A (54.69%) was the most prevalent, followed by Genotype B (34.38%) and Genotype C (10.94%). In regards to genetic variation, genotypes A and B were more similar compared to genotype C. Conclusion: The current study revealed a high prevalence of vaginal candidiasis with different genotypes of C. albicans among pregnant women. Therefore, it is worth considering a vaginal swab culture with clinical symptoms during the diagnosis of vaginal candidiasis. Keywords: Candida; Genotypes; Vulvovaginitis; Candidiasis; Prevalence.
Influence of Childhood Trauma on Former Prisoners’ Attributional Style and Recidivism in Three Years
Authors: Jung Hayoung , Lee DongHun
Published: April 2021

This study aimed to verify the mediating effects of attribution style, both external and internal, in the relationship between childhood trauma and former prisoners’ recidivism. In 2017, recidivism data on 235 former prisoners who had received Korea Rehabilitation Agency (KRA)’s housing support service in 2014, and had responded to the childhood traumatic questionnaire and surveys on external and internal attributions, were retrieved from the KRA. The analysis revealed that greater childhood trauma was correlated both with higher external and lower internal attribution. Although the relationship between high childhood trauma and recidivism was significant, no significant relationship appeared between internal/external attribution and recidivism. Further, the analysis did not confirm the mediating effect of attribution on the relationship between childhood trauma and recidivism. This indicates that traumatic experiences during childhood increase former prisoners’ external attribution, lower internal attribution, and lead to a higher probability of recidivism. These results demonstrate that interventions on childhood trauma may be effective in lowering recidivism because childhood trauma plays a key role in the former prisoners’ reoffending and attributions that may influence the interpretation of their criminal behavior.
The African Union Makes Its Mark in the Pandemic
Authors: Tieku Thomas Kwasi
Published: April 2021

A new spirit of pan-Africanism guided the continent’s response to the pandemic. Led by South African President Cyril Ramaphosa, the African Union provided multilateral coordination and worked with external partners to obtain support, while the Africa Centres for Disease Control and Prevention organized the pandemic responses of national public health agencies. The pandemic showed the risks of continued reliance on foreign donors for resources such as vaccines, but the collective response demonstrated that the AU has become a strong institution capable of addressing regional and global challenges.
Tanzania’s Authoritarian Turn
Authors: Becker Felicitas
Published: April 2021

For a time, Tanzania enjoyed a reputation for mostly free elections and public debate. But after President John Magufuli was elected in 2015, he introduced measures to stifle the media and tilt the electoral playing field in favor of the longtime ruling party. The turn toward authoritarianism is not due to any one personality or stereotypical “mad dictator,” however (notwithstanding Magufuli’s pandemic denialism, which may have cost him his life). It is part of the legacy of the early postcolonial period and the revered founding president, Julius Nyerere, who set the foundations of one-party rule and wielded the rhetoric of economic nationalism.
Kök Kanal Şekillendirilmesinde Kullanılan Farklı Döner Eğe Sistemlerinin Apikalden Taşan Debris Miktarına Etkisinin Karşılaştırılması
Authors: ERKAN Seda , KAYA Sadullah , FALAKALOĞLU Seda
Published: April 2021

Amaç: Bu
in vitro çalışmanın amacı; Reciproc
Blue, Protaper Next ve Protaper Universal döner eğe sistemlerini kullanarak,
apikalden taşan debris miktarının karşılaştırılmasıdır.

Gereç ve Yöntemler: Çalışmamızda
60 adet alt premolar diş; Reciproc Blue (R40; VDW, Munich, Germany), Protaper
Next (X4; Dentsply Maillefer, Ballaigues, Switzerland) ve Protaper Universal
(F4; Dentsply Maillefer, Ballaigues, Switzerland) döner nikel-titanyum (Ni-Ti)
eğe sistemleri ile şekillendirilmek üzere üç ayrı deney grubuna ayrıldı (n=20).   Şekillendirme işlemlerinde ve final
irrigasyonunda şırınga pompası kullanılarak toplam 10 ml distile su ile
irrigasyon yapıldı.  Bürklein ve
arkadaşlarının kullandığı düzenek oluşturularak apikalden taşan debris, ağırlıkları
önceden elektronik tartıyla belirlenen eppendorf tüpleri içerisinde
biriktirildi. Sonrasında net debris ölçümü için eppendorf tüpleri 70°C ve 5 gün
boyunca etüvde bekletildi. Apikalden taşan debris miktarı, debris içeren
eppendorf tüplerin ağırlığından boş eppendorf tüplerin ağırlığı çıkarılarak hesaplandı.

Bulgular:
Gruplar arasındaki farklılıklar incelenirken, ikili
gruplarda Mann Whitney U, ikiden fazla gruplarda Kruskal Wallis-H testlerinden
yararlanıldı. Kruskal Wallis-H testinde anlamlı farklılıkların görülmesi
durumunda Post-Hoc çoklu karşılaştırma testi ile aralarında farklılık olan
gruplar belirlendi. Sonuçlar p<0,05 düzeyinde anlamlı kabul edildi. Taşan
debris ağırlıkları bakımından gruplar arasında istatistiksel olarak anlamlı
farklılık bulundu (p=0,025). Şekillendirme
sistemlerine göre taşan debris miktarı bakımından gruplar arası
ikili karşılaştırma sonuçlarına göre; Protaper Universal’ın diğer sistemler ile
aralarında istatistiksel olarak anlamlı farklılık bulunmamıştır. Protaper Next
ile Reciproc Blue grupları arasındaki karşılaştırmada Protaper Next, Reciproc
Blue’ye göre anlamlı derecede daha az debris taşırdığı görülmüştür (p=0,007).

Sonuç: Bu
in vitro çalışmada kullanılan tüm
döner eğe sistemlerinin apikalden debris taşkınlığına neden olduğu tespit
edilmiştir.

Anahtar Kelimeler: Apikal Ekstrüzyon, Debris, Reciproc Blue,
Protaper Next, Protaper Universal
Ortodontik Tedaviye Kabul Edilen Hastaların Dental Korku ve Ortodontik Anksiyete Seviyeleri Arasındaki İlişkinin İncelenmesi
Authors: ÇINARSOY CİĞERİM Saadet , KAZANCI Fatih
Published: April 2021

Amaç: Bu çalışmanın amacı ortodonti kliniğine ilk kez başvuran hastalar ile bonding işlemi yapılmış hastalardaki dental korku ve ortodontik anksiyete seviyelerinin değerlendirilmesidir. Gereç ve Yöntemler: Araştırmaya Van Yüzüncü Yıl Üniversitesi Diş Hekimliği Fakültesi Ortodonti Kliniği’ne başvuran 11-20 yaş arasında toplam 200 birey (132 bayan, 68 erkek) dahil edildi. Bonding işlemi yapılmış hastalar çalışma grubunu, ortodonti kliniğine ilk kez başvuran hastalar ise kontrol grubunu oluşturdu. Bireylerin dental korku düzeylerinin belirlenmesi amacıyla Dental Korku Skalası “DKS” (Dental Korku Skalası), ortodontik tedavi ile ilişkili dental anksiyete seviyelerinin belirlenmesi amacıyla “ÇAS” (Çapa Anksiyete Skalası) anketleri doldurtuldu. Bireylerdeki dental korku ve ortodontik anksiyete seviyeleri değerlendirildi. Bilgileri değerlendirmek için tanımlayıcı analizler kullanıldı. Elde edilen veriler %5 anlamlılık seviyesinde istatistiksel olarak analiz edildi. Bulgular: Araştırma kapsamına alınan toplam 200 hastanın 132’si kız (%66) ve 68’i erkektir (%34). Kız hastaların yaş ortalaması 16,14 iken erkek hastaların yaş ortalaması 15,6’dır. Ortalama DKS değeri 36,6±14,4, ortalama ÇAS değeri 17,46±7,42’ tir. Dental Korku” ve “Ortodontik Anksiyete” 11-15 yaş grubundaki bireylerde 16-20 yaş grubundaki bireylere göre daha yüksek bulundu. DKS skor ortalamaları ve ÇAS skor ortalamaları, ortodontik tedaviye ilk kez başvuran bireylerde, bonding işlemi yapılan bireylere göre daha yüksek olarak bulundu. Sonuç: Bu çalışmada, ortodontik bonding işlemlerinin dental korku ve anksiyete seviyesini azalttığı ve küçük yaştaki bireylerin ortodontik tedaviye karşı daha fazla dental korku ve anksiyete hissettikleri belirlendi.
Diş Hekimliği Öğrencilerinin Dental Market Ürünleri Hakkındaki Bilgi Düzeylerinin Değerlendirilmesi
Authors: ŞEN YAVUZ Betül , KANBEROĞLU Elif , TANBOĞA İlknur
Published: April 2021

Amaç: Araştırmada Marmara Üniversitesi Diş Hekimliği Fakültesi’nde öğrenim gören diş hekimi adaylarının güncel dental market ürünleri hakkındaki bilgi düzeylerinin değerlendirilmesi amaçlanmıştır.
Gereç ve Yöntemler: Kesitsel tipteki araştırma, Marmara Üniversitesi Diş Hekimliği Fakültesi’nde öğrenim gören birinci ve beşinci sınıf öğrencilerinden oluşan toplam 140 öğrenciye uygulanmıştır. Veri toplama araçları olarak bilgilendirme formu, onam formu ve anket formu kullanılmıştır. Toplamda 26 sorudan oluşan anket formu; demografik bilgileri içeren bölüm, öğrencilerin lisans eğitiminde dental market ürünleri ile ilgili aldıkları eğitimle ilgili bilgileri içeren bölüm, ürünlerle ilgili bilgi sorularını içeren bölüm olmak üzere 3 ana bölümden oluşmaktadır. Verilerin değerlendirilmesinde tanımlayıcı veriler yüzdelik, aritmetik ortalama olarak verilmiştir. Verilerin istatistiksel analizleri MedCalc 18.11.3 versiyon paket programı kullanılarak yapılmıştır, p<0.05 anlamlı olarak kabul edilmiştir. Kategorik değişkenlerin karşılaştırılması için Kikare testi kullanılmıştır.
Bulgular: Araştırmaya katılan 140 öğrencinin 60’ı (37 kadın, 23 erkek) birinci sınıf, 80’i (51 kadın, 29 erkek) beşinci sınıf öğrencisidir. Son sınıf öğrencilerinin %72’si lisans eğitimlerinde ağız ve diş sağlığı ürünleri hakkında eğitim aldıklarını belirtmiştir. Birinci sınıf öğrencilerinin en az doğru yanıt verdiği soru florun etkinliğini (%3) ölçen soru iken, beşinci sınıf öğrencilerinin en az doğru yanıt verdiği soru biberon kullanımı (%12.5) hakkındaki sorudur. Bilgi sorularının neredeyse tamamında beşinci sınıf öğrencilerinin verdiği doğru yanıtlar daha fazladır. Fakat ideal biberon yapısı hakkında birinci sınıf öğrencilerinin daha fazla bilgiye sahip olduğu görülmektedir.
Sonuç: Diş hekimliği eğiminin son yılında dahi öğrencilerin dental market ürünleri konusundaki bilgi düzeyinin yetersiz olduğu görülmektedir. Sürekli eğitim kursları eğitimdeki eksiklikler ve belirsizlikleri çözülmesine yardımcı olabilir.
PROTEZ TEMİZLEYİCİ SOLÜSYONLARIN HASSAS TUTUCULU HAREKETLİ PROTEZLERİN TUTUCU LASTİK KISIMLARININ SERTLİKLERİ ÜZERİNE ETKİLERİNİN ARAŞTIRILMASI
Authors: KÜMBÜLOĞLU Doç Dr. Övül , KAYA Elif , ŞAHAN Makbule
Published: April 2021

Amaç: Bu çalışmanın amacı, farklı protez temizleyici solüsyonlarının, hastalarda sıklıkla kullanılan hassas bağlantılı sistemlerin lastiğinin sertliği üzerine etkilerinin incelenmesidir.
Gereç ve Yöntemler: Hassas tutuculu hareketli protezlerin tutucu lastik kısımları 8 er adetten 4 ayrı gruba ayrılıp her bir grup farklı solüsyonlarda 3 aylık klinik kullanıma denk gelecek şekilde solüsyonlarda bekletildi: yapay tükürük (kontrol), corega temizleme-tableti, 5.25% sodyum hipoklorit (NaOCl, 1:10 seyreltme), aktident temizleme-tableti. Bekletme süresi 8 saat/gün solüsyon, 16 saat/gün tükürük olmak üzere ölçümler 0, 1,7, 21 ve 90. günlerde yapıldı. Bundan sonra her biri için sertlik kaybını test etmek için Shore D Durometer (Milton Trading Co) testi uygulandı. Sonuçlar istatistiksel olarak değerlendirildi.
Bulgular: 4 farklı solüsyonda bekletilen hassas tutucu lastiklerinin sertlik testi sonuçlarına göre, kullanılan solüsyonlar arasında istatistiksel olarak anlamlı fark bulunmadı. (p>0,05) Verilere göre 0. gün ile 1.-7.-21. -90. günler arasındaki fark anlamlı bulunmuştur. (p<0,05)
Sonuç: Hassas tutucu lastiklerini dental solüsyonlarda bekletmekle kontrol grubu olan yapay tükürükte bekletmek arasında 3 aylık klinik kullanıma denk gelen süre içinde kimyasal ve fiziksel özellikler bakımından istatiksel olarak anlamlı bir fark yoktur. Fakat 3 aylık süreçte tüm grupların sertlikleri azalmıştır.
Evaluation of interdisciplinary communications between departments of prosthodontics and orthodontics
Authors: YAĞCI Filiz , ÖZTÜRK Taner
Published: April 2021

Objectives: Prosthodontics and Orthodontics are the disciplines which frequently needs communication during treatments. The aim of this study was to evaluate the interdisciplinary relationship to reveal the mostly consulted subjects between departments of prosthodontics and orthodontics in a faculty of dentistry by examining the consultation notes.
Materials and Methods: Consultation notes of 900 patients who were treated at XXX University Faculty of Dentistry, Departments of Prosthodontics and Orthodontics were evaluated. The reasons for referral of 377 patients from prosthodontics clinic to the orthodontics clinic; and the reasons for referral of 523 patients from orthodontics clinic to prosthodontics were investigated. Furthermore, the frequency of the consultations that were required by a specialist and a post-graduate student were determined. The data were analyzed Pearson Chi-Square and Fisher's Exact tests.
Results: The most common reason for consulting was the assessment of the space for implant treatment (prosthodontics to orthodontics: n=161, 42.7 % and orthodontics to prosthodontics: n=255, 48.8 %). It was determined that the post-graduate students ask for a consultation for many more reasons than a specialist (p<0.05).
Conclusions: Interdisciplinary relationships were determined from the consultation notes between prosthodontics and orthodontics clinics. According to the results of the present study, it was seen that implant placement site and esthetic restorations were the basic issues of the interdisciplinary relationship between the two departments. Furthermore, the information provided by the study is thought to be useful for the education of the post-graduate students.
Farklı Yaş Gruplarında Bizigomatik Genişlik, Maksilla ve Foramen Magnumda Cinsiyete Bağlı Değişiklikler
Authors: YESİLOVA Esra
Published: April 2021

Amaç: Bu çalışmanın amacı farklı dekatlarda kişilere ait konik ışınlı bilgisayarlı tomografi (KIBT) görüntülerinde kafa tabanından elde edilen ölçüm ve değerlendirmelerle cinsiyetin ilişkisinin değerlendirilmesi idi.
Gereç ve Yöntemler: Çalışma, 5 dekattan eşit sayıda olmak üzere toplam 100 kişinin KIBT görüntüleri üzerinde yapıldı. Foramen magnumun değerlendirilmesi için 8 kategorili bir sınıflama kullanıldı. Foramen magnum boyutları transversal ve sagital, maksiller alveolar alan boyutları transversal ve sagital, bizigomatik uzunluk ise transversal yönde ölçüldü. Ölçümler KIBT kendi yazılımında iki kez tekrarlandı. Verilerin istatistik analizi IBM SPSS Statistics 21.0 programında yapıldı. İstatistiksel önemlilik için p<0.05 değeri kriter kabul edildi.
Bulgular: Erkeklerde en sık “hegzagonal”, kadınlarda “yumurta şeklinde” foramen magnum en sık izlenen tiplerdi. Bununla birlikte cinsiyetin foramen magnum tipleri dağılımı üzerinde etkisi görülmedi (p=0.841). Ölçümü yapılan tüm parametreler ve cinsiyet değişkeninin arasında anlamlı fark olduğu görüldü (her bir değişken için p<0.05).
Sonuç: Radyolojik verilerin adli bilimlerde önemi giderek artmaktadır. Cinsiyet değişkeninin belirlendirilmesinde KIBT verilerinin, anatomik ve BT çalışmaları verileri ile uyumlu olduğu görülmüştür. Ağız diş ve çene radyolojisinin sadece hastalıkların teşhisinde, tedavi ve prognoz takiplerinde değil aynı zamanda adli bilimlerde de önemli katkısı olacağı ön görülmektedir.
Aortic Dissection with Rare Anatomical Aortic Arch Variation Depicted by Computed Tomography Angiography
Authors: Wang Xin , Liu Bofu , Yu Haifang
Published: April 2021

Aortic dissection (AD) is a life-threatening disease, and endovascular repair by stent graft is an effective treatment. Surgery often fails for a variety of reasons, such as aortic arch variation. We present the case of a 27-year-old female with aortic dissection with a rare anatomical aortic arch variation caused by chest trauma. This patient recovered well after endovascular repair. This case report demonstrates endovascular repair can be applied to aortic dissection patients with rare anatomical aortic arch variation.
Acercamiento teórico a la constitucionalidad del sistema tributario colombiano
Authors: Pino Montoya Jose Wilmar , Vélez Escobar Sol Beatriz , Cabrera Jaramillo Ruby Stella
Published: April 2021

Este artículo de reflexión es el resultado del proyecto de investigación “Percepción social de los pequeños contribuyentes acerca de la constitucionalidad del sistema tributario colombiano”, que tiene por objetivo general analizar la percepción social de los pequeños contribuyentes acerca de la constitucionalidad del sistema tributario colombiano. La investigación se realiza desde el enfoque cualitativo y desde una estrategia de estudio documental. En los resultados se aprecia la fundamentación constitucional del pago del impuesto colombiano y cómo este se concreta en el sistema tributario, lo que lo hace un sistema cambiante. Como conclusiones se logra visualizar la garantía del impuesto a partir de la constitución, la concreción de los fines del Estado con su cobro y la potestad de exigir el pago del justo tributo bajo el marco constitucional.
Función de los consultorios jurídicos en el posconflicto
Authors: Romero Rodríguez Gloria Inés
Published: April 2021

Este artículo es un avance de una investigación sobre la situación de las víctimas del conflicto armado en el posconflicto luego de la firma de los Acuerdos de Paz entre el Estado colombiano y las Fuerzas Armadas Revolucionarias de Colombia – Ejército del Pueblo (FARC-EP), en la que se propone la firma de un convenio entre la Defensoría del Pueblo y la Jurisdicción Especial para la Paz (JEP) como mecanismos para agilizar la capacidad de respuesta de esta corporación. Este convenio apuntaría a que los estudiantes de derecho adscritos a los consultorios jurídicos de las Facultades de Derecho colombianas se puedan vincular al Sistema Autónomo de Asesoría y Defensa Gratuita (SAAD), como mecanismo para lograr una atención acertada a las víctimas del conflicto armado de escasos recursos, entendiendo que la consolidación de lo propuesto en el tratado firmado por las partes exige que las personas de escasos recursos víctimas del conflicto armado tengan un trato prevalente que les asegure una atención integral, si se desea alcanzar la construcción de un nuevo modelo de sociedad. Para ello, se parte de la hipótesis de que la atención de los consultorios jurídicos a las víctimas del conflicto armado de escasos recursos mejoraría la implementación del SAAD reglamentado en el Decreto 1166 del 11 de julio de 2018.
Entornos personales de aprendizaje: Estrategias y tecnologías utilizadas por el alumnado universitario
Authors: Serrano-Sánchez José Luis , López-Vicent Patricia , Gutiérrez-Porlán Isabel
Published: April 2021

Objetivo. En este artículo se describe y se analizan los entornos de aprendizaje personal (PLE, por sus siglas en inglés) de las futuras personas trabajadoras en diversas áreas del conocimiento. Metodología. Se recopilaron datos de 2 054 estudiantes de último año de grado en 75 universidades españolas sobre cuatro aspectos: gestión de la información, gestión del proceso de aprendizaje, autopercepción y comunicación. Se diseñó una investigación exploratoria no experimental y la información se recopiló a través de un cuestionario validado. Resultados. Los resultados proporcionan un perfil del estudiantado que utiliza internet para realizar búsquedas de información y comunicación; pero que están más cómodos en entornos de aprendizaje cara a cara con el personal docente que establece objetivos claramente definidos en lugar de utilizar internet para el aprendizaje autónomo. Conclusiones. Existen claras limitaciones cuando se trata de usar internet como un verdadero espacio de trabajo y aprendizaje. Se recomienda a las instituciones de educación superior diseñar programas para mejorar las habilidades de gestión de los entornos personales de aprendizaje del estudiantado para su posterior aplicación en el entorno laboral.
Desafíos de la movilidad electrónica en entornos escolares de la educación infantil
Authors: Sánchez-Blanco Concepción
Published: April 2021

Este ensayo reflexiona sobre un uso crítico de los medios electrónicos y de la movilidad de información que producen, junto con los desafíos educativos que abren en los primeros años de la escolaridad, haciendo especial hincapié en las tecnologías de la información y la comunicación (TIC). Se partirá de la discusión de resultados y conclusiones surgidas a raíz de trabajos de investigación cualitativos realizados por la autora al respecto, durante varios años, entre el 2012 y 2018 en Galicia (España). Se apoyará, también, en el análisis explicativo del papel que juegan estos medios en el mundo social, así como en las necesidades infantiles, del profesorado y, en general, de los entornos escolares, inmersos en un mundo en el cual la movilidad electrónica, azuzada por la celeridad, rompe fronteras temporales y espaciales. La búsqueda de la simultaneidad y la construcción de caminos planetarios han hecho que la información salga y entre y se proyecte fuera y dentro del planeta. Nuevas realidades e identidades emergen capaces de originar no pocas dificultades, pero también nuevos senderos y soluciones a problemas hasta entonces irresolubles. El uso comprometido con la justicia y contra la exclusión de las TIC debiera formar parte de las intervenciones de la escuela, representando recursos y no fines en sí mismas, de manera que su uso ético resulta condición imprescindible para que sean verdaderamente educativas. Han dado lugar a realidades complejas y niños y niñas de cortas edades construyen conocimiento al respecto, por lo cual representan una fuente de prácticas docentes que deben ser analizadas para alejarse de la exclusión y empeñarse en la búsqueda de la equidad, entendida desde el punto de vista infantil.
Problemáticas públicas como temáticas controversiales. Profesorado de historia y la enseñanza de la independencia nacional para la formación ciudadana en el Bicentenario de Chile
Authors: Cavieres-Fernandez Eduardo , Uzcátegui-Pacheco Ramón Alexander
Published: April 2021

Objetivo: El objetivo de este estudio es explorar las temáticas públicas que el profesorado chileno de historia, de enseñanza secundaria, estudiado en esta investigación, considera relevantes para ser discutidas durante la enseñanza de la independencia nacional (1810-1818) en vistas a la formación ciudadana de su estudiantado en el contexto del Bicentenario en Chile. Metodología: Para ello, se utilizan instrumentos cualitativos tales como la entrevista y observaciones de clase con participantes principales y entrevistas grupales con participantes secundarios provenientes de cuatro ciudades ubicadas a lo largo del país. Resultados: Este profesorado investigado coincide en señalar problemáticas que han supuesto relaciones de poder que afectan lo público y, ante las cuales, la enseñanza de la independencia nacional aporta elementos para reflexionar en profundidad sobre estos temas. Conclusiones: Si bien en las clases observadas al profesorado estudiado no hubo discusiones propiamente tales en torno a estas problemáticas, los intercambios iniciados por el personal docente sobre estas sí deben ser valorados, al menos, como un intento por hacerlas controversiales en contextos curriculares que no siempre permiten la discusión.
Factores motivacionales intrínsecos en el uso de ePortfolios por el estudiantado en programas de Máster en Formación del Profesorado
Authors: Ciesielkiewicz Monika , Méndez-Coca David , Méndez-Coca Miriam
Published: April 2021

En esta investigación nos hemos propuesto analizar los factores intrínsecos que podrían motivar al estudiantado a crear y utilizar un ePortfolio. Las personas participantes de nuestro estudio son estudiantes que cursaron el Máster en Formación del Profesorado en tres universidades diferentes. Para los fines de este estudio se ha utilizado una encuesta cuantitativa online administrada a través de los formularios de Google. La motivación intrínseca se midió por medio de una evaluación basada en el Test de motivación intrínseca (IMI). Este instrumento midió las siguientes dimensiones: la competencia percibida al realizar el ePortfolio, el esfuerzo invertido al realizar esta tarea, el valor o utilidad que le han dado a su realización y la presión o tensión sentida por el estudiantado cuando hizo esta actividad. Nuestros datos indican que los factores intrínsecos que más motivan al alumnado son la apreciación del valor y utilidad del ePortfolio, seguidos de la percepción de la competencia adquirida.
Caracterización de bacterias cultivables aisladas de sitios de arrecifes mesofóticos de Cuba
Authors: Ortiz-Guilarte Eudalys , Iglesias-Rodríguez María Victoria , Núñez-Moreira Roberto Rafael , Caballero Barreto Valia , González-Tamayo Daymarlen , Lugioyo-Gallardo Gladys Margarita
Published: April 2021

Las comunidades bacterianas de sitios de arrecifes mesofóticos constituyen información genética de interés por las condiciones particulares de temperatura, presión, salinidad y disponibilidad de materia orgánica y nutrientes en la que se desarrollan. El presente trabajo tuvo como objetivo evaluar la diversidad bacteriana en aguas aledañas a los arrecifes mesofóticos de Cuba en mayo-junio de 2017; así como algunas de sus potencialidades biotecnológicas. Los cultivos fueron aislados en medio agar marino, en dos niveles de la columna de agua, en 10 sitios de muestreos. Posteriormente se evaluaron las capacidades metabólicas de los aislados, relacionadas con la asimilación de diferentes fuentes de carbono y la producción de metabolitos bioactivos. Los resultados permitieron la caracterización de 30 aislados bacterianos de aguas del nivel subsuperficial y 32 de aguas profundas. El mayor porcentaje corresponde a bacilos esporulados Gram positivos y bacilos Gram negativos. Asimismo, se demostró que el 85.5% degradan carbohidratos de diferente naturaleza y el 96.8% producen enzimas hidrolíticas con actividad caseinasa, gelatinasa, lipasa o amilasa. La capacidad de degradar petróleo y compuestos fenólicos indistintamente fue detectada en el 61.3% de los aislados. Entre las potencialidades de interés biomédico e industrial se detectó actividad tensioactiva y asparaginasa en el 53% y 32% de los cultivos, respectivamente. Por su parte, la caracterización taxonómica de 40 cultivos seleccionados por sus potencialidades metabólicas demostró que el género Bacillus presentó mayor actividad biológica. Estos resultados constituyen el primer acercamiento a la caracterización de la diversidad bacteriana en sitios de arrecifes mesofóticos de Cuba.
Trifolium vesiculosum (Fabaceae) in Ukraine: a new find and historical overview
Authors:   M.G. Kholodny Institute of Botany, National Academy of Sciences of Ukraine, Shyriaieva D.V. , Shyian N.M. ,   M.G. Kholodny Institute of Botany, National Academy of Sciences of Ukraine
Published: April 2021

Trifolium vesiculosum is listed in the current floristic inventories as a species native to Ukraine. In order to clarify the native versus alien status of this taxon, we studied historical and recent literature and herbarium data.We also report here our new record of the species. We found T. vesiculosum in 2020 in Mykolayiv Region (Mykolayiv District, Andriivka village, on the alluvial terrace of the Southern Bug River valley), in a disturbed habitat with predominantly synanthropic and alien species. Previous finds of T. vesiculosum in Ukraine were reported mainly in publications of the 19th century and were based on a few herbarium specimens from the present-day territory of Odesa Region. Due to characteristics of these records, dates and localities of the finds of T. vesiculosum in Ukraine, we have traced its probable introductions during the 19th century in the port of Odesa, on the sand deposits of the Danube River, in the German settlements, and therefore we can confirm the conclusion of Paczoski (1921) who assumed the alien status of the species in Ukraine. Thus, T. vesiculosum is classified as a kenophyte (introduced before 1808). Taking into account the current climatic changes in Ukraine, we emphasize the need for further monitoring of the species, changes in its dispersal strategy, and for registration of its introduction and dispersal pathways.
Pengembangan Electronic Customer Relationship Management Berbasis Web untuk Peningkatan Loyalitas Pelanggan
Authors: Hidayatuloh Sarip , Hasanati Nidaul , Wirawan Muhammad Rafi
Published: April 2021

Bisnis sudah menjadi bagian dari kehidupan masyarakat. Salah satunya yang tidak lepas dari bisnis adalah perusahaan. Perusahaan di seluruh dunia bersaing untuk mendapatkan keuntungan yang sebesar-besarnya dari customer. Mereka semua berlomba-lomba mendapatkan customer dengan cara mempelajari perilaku customer yang cenderung konsumtif dan selalu berubah - ubah mengikuti tren. Customer Relationship Management (CRM) menjadi salah satu hal yang berperan penting bagi perusahaan. PT. Sanprima Sentosa adalah salah satu cabang dealer dan bengkel dari Astra Honda Motor (AHM) Indonesia yang membutuhkan perkembangan di bagian CRM. Model untuk pengembangan sistem yaitu: Rapid Application System (RAD). Pada perancangan sistem dilakukan dengan menggunakan tool Unified Model Language (UML). Aplikasi yang digunakan berbasis website dengan menggunakan MySQL sebagai penyimpanan database. UML yang dibuat terdiri atas Use case Diagram, Activity Diagram, Sequence Diagram, Class Diagram, Statechart Diagram dan Deployment Diagram. Hasil penelitian menyimpulkan bahwa Elektronik CRM adalah solusi yang efektif dan efisien untuk meningkatkan loyalitas customer. E-CRM ini memiliki fungsi pemesanan sepeda motor, fitur testimoni untuk customer yang dapat memberikan feedback kepada perusahaan, fitur rewarding untuk customer yang telah melakukan pelunasan pemesanan cash, dan fitur promosi untuk customer agar mendapatkan potongan harga pada event tertentu saja.
Effectiveness of Covid-19 Information through Social Media based on Public Intention
Authors: Yuniarto Dwi , Khozinaturrohmah Hasna Nazzala , Abd. Rahman Aedah Binti
Published: April 2021

Corona Virus Disease-19 pandemic has changed people's habits today. Likewise, with the use of social media in terms of conveying information to the public. The government has now formed task forces in each region to prevent the spread of the virus. Among its duties is to convey information related to the prevention and spread of Corona Virus Disease-19. Considering that information delivery is deemed ineffective, some people do not fully know information about the Corona Virus Disease-19. The purpose of this study is to determine the effectiveness of information on Corona Virus Disease-19. To understand the relationship between the public's intention to end the Covid-19 pandemic and the effectiveness of Covid-19 information through social media the statistical analysis used is Cramer's V Non-Parametric Statistics, meanwhile, to find out whether the public's intention to end the Covid-19 pandemic affects the effectiveness of Covid-19 information through social media it is done through the partial least square approach. Questionnaire distribution via WhatsApp and made in google form to facilitate the distribution and filling. The number of responses was 401 respondents. The results obtained, the relationship between the latest education and attitudes when receiving hoax information and work relations with the frontline to end Corona Virus Disease-19 is that the community is declared insignificant, while the intention variable does not have a significant effect on the effectiveness factor. Different objects and respondents will be more interesting for further research as material for other researchers. Research results can be used as material for related parties, in this case the government to determine the media used to convey information about Covid-19.