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2023

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Outcomes Of Kidney Transplantation In Patients With Congenital Anomalies Of The Kidney And Urinary Tract: A Propensity-Score-Matched Analysis With Case-Control Design, Özgür Akin Oto, Şafak Mi̇ri̇oğlu, Hali̇l Yazici, Ahmet Burak Di̇ri̇m, Nurane Güller, Seda Şafak, Erol Demi̇r, Ayşe Serra Artan, Mesude Yasemi̇n Özlük, Aydin Türkmen, Yaşar Kerem Çalişkan, Krista L. Lentine Jan 2023

Outcomes Of Kidney Transplantation In Patients With Congenital Anomalies Of The Kidney And Urinary Tract: A Propensity-Score-Matched Analysis With Case-Control Design, Özgür Akin Oto, Şafak Mi̇ri̇oğlu, Hali̇l Yazici, Ahmet Burak Di̇ri̇m, Nurane Güller, Seda Şafak, Erol Demi̇r, Ayşe Serra Artan, Mesude Yasemi̇n Özlük, Aydin Türkmen, Yaşar Kerem Çalişkan, Krista L. Lentine

Turkish Journal of Medical Sciences

Background/aim: We compared long-term outcomes after kidney transplantation (KTx) in patients with and without congenital anomalies of the kidney and urinary tract (CAKUT). Materials and methods: KTx recipients (KTRs) with CAKUT in 1980-2016 were identified; their hard copy and electronic medical records were reviewed and compared to a propensity-score-matched control group (non-CAKUT) from the same period. The primary outcomes were graft loss or death with a functioning graft; secondary outcomes included posttransplant urinary tract infections (UTIs) and biopsy-proven rejection (BPR). Results: We identified 169 KTRs with CAKUT and 169 matched controls. Median follow-up was 132 (IQR: 75.0-170.0) months. UTIs were …

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Screening Of Antigliadin And Antitissue Transglutaminase Antibodies In Patients With Chronic Plaque Psoriasis: A Case-Control Study, Burhan Engi̇n, Chinara Huseynova, Tümay Ak, Ali̇ Yağiz Ayla, Günay Can, Serdal Uğurlu Jan 2023

Screening Of Antigliadin And Antitissue Transglutaminase Antibodies In Patients With Chronic Plaque Psoriasis: A Case-Control Study, Burhan Engi̇n, Chinara Huseynova, Tümay Ak, Ali̇ Yağiz Ayla, Günay Can, Serdal Uğurlu

Turkish Journal of Medical Sciences

Background/aim: In this study, we aimed to investigate different types of celiac antibodies in psoriasis patients and to see if the presence of the antibodies was associated with other variables. Materials and methods: We included patients with plaque psoriasis who were followed up in our dermatology clinic between February 2019 and February 2021 and added a healthy control group for comparison. The antibodies studied were serum antitissue transglutaminase (tTG)-IgA, tTG-IgG, antigliadin antibody (AGA)-IgA, and AGA-IgG. The patients' records were used to note age, sex, the pattern of psoriasis involvement, psoriasis area and severity index (PASI), presence of hypertension, presence of …

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What Is The Yield Of Ebus-Tbna For Re-Evaluation Of Previously Treated Non-Small-Cell Lung Cancer?, Ayperi̇ Öztürk, Tuğba Çi̇çek, Aydin Yilmaz Jan 2023

What Is The Yield Of Ebus-Tbna For Re-Evaluation Of Previously Treated Non-Small-Cell Lung Cancer?, Ayperi̇ Öztürk, Tuğba Çi̇çek, Aydin Yilmaz

Turkish Journal of Medical Sciences

Background/aAim: Locoregional recurrence in lung cancer still remains an important problem. We aimed to indicate the effectiveness of endobronchial ultrasound-guided transbronchial needle aspiration (EBUS-TBNA) for reevaluation in previously treated nonsmall cell lung cancer (NSCLC). Materials and methods: NSCLC patients who underwent EBUS for rebiopsy of suspicious recurrent or progressive lesions between January 2010 and June 2017 were reviewed. Patients were categorized into two groups based on the previous treatment modalities: Group 1 (G1) consisted of patients who had been treated with chemoradiotherapy, and Group 2 (G2) consisted of patients who had undergone radical surgery. Results: Of 115 patients, 100 patients …

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The Effect Of Different Boron Compounds On Nutrient Digestibility, Intestinal Nutrient Transporters, And Liver Lipid Metabolism, Emre Şahi̇n, Cemal Orhan, Füsun Erten, Fi̇kretti̇n Şahi̇n, Nurhan Şahi̇n, Kazi̇m Şahi̇n Jan 2023

The Effect Of Different Boron Compounds On Nutrient Digestibility, Intestinal Nutrient Transporters, And Liver Lipid Metabolism, Emre Şahi̇n, Cemal Orhan, Füsun Erten, Fi̇kretti̇n Şahi̇n, Nurhan Şahi̇n, Kazi̇m Şahi̇n

Turkish Journal of Medical Sciences

Background/aim: Gastrointestinal health is essential for maintaining a healthy lifestyle. Improving nutrient absorption and energy metabolism are the critical targets for intestinal health. This study aimed to determine the effects of different boron (B) derivatives on nutrient digestibility, intestinal nutrient transporters, and lipid metabolism in rats. Materials and methods: Twenty-one rats were allocated to three groups (n = 7) as follows: (i) Control, (ii) Sodium pentaborate pentahydrate (SPP), and (iii) boric acid (BA). The rats were fed a chow diet (AIN-93M) and supplemented with 8 mg/kg elemental B from SPP (45.2 mg/kg BW) and BA (42.7 mg/kg BW) via oral …

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T1 Relaxation Time Is Prolonged In Healthy Aging: A Whole Brain Study, Hayri̇ye Aktaş Di̇nçer, Ahmet Muhteşem Ağildere, Di̇dem Gökçay Jan 2023

T1 Relaxation Time Is Prolonged In Healthy Aging: A Whole Brain Study, Hayri̇ye Aktaş Di̇nçer, Ahmet Muhteşem Ağildere, Di̇dem Gökçay

Turkish Journal of Medical Sciences

Background/aim: Measurement of tissue characteristics such as the longitudinal relaxation time (T1) provides complementary information to the volumetric and surface based structural analyses. We aimed to investigate T1 relaxation time characteristics in healthy aging via an exploratory design in the whole brain. The data processing pipeline was designed to minimize errors related to aging effects such as atrophy. Materials and methods: Sixty healthy participants underwent MRI scanning (28 F, 32 M, age range: 18-78, 30 young and 30 old) in November 2017-March 2018 at the Bilkent University UMRAM Center. Four images with varying flip angles with FLASH (fast low angle …

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A National, Multicenter, Retrospective Study Evaluating Retention Rate And Efficacy Of Tocilizumab Treatment In Patients With Active Rheumatoid Arthritis Who Had An Inadequate Response To Csdmards And/Or Tnf Inhibitors, Güzi̇de Nevsun İnanç, Mustafa Ender Terzi̇oğlu, Yusuf Karabulut, Zevcet Yilmaz, Emi̇ne Fi̇gen Tarhan, Mehmet Emi̇n Eneci̇k, Ali̇ Şahi̇n, Adem Küçük, Ayşe Ayan, Meti̇n Özgen, Uğur Karasu, Servet Yolbaş Jan 2023

A National, Multicenter, Retrospective Study Evaluating Retention Rate And Efficacy Of Tocilizumab Treatment In Patients With Active Rheumatoid Arthritis Who Had An Inadequate Response To Csdmards And/Or Tnf Inhibitors, Güzi̇de Nevsun İnanç, Mustafa Ender Terzi̇oğlu, Yusuf Karabulut, Zevcet Yilmaz, Emi̇ne Fi̇gen Tarhan, Mehmet Emi̇n Eneci̇k, Ali̇ Şahi̇n, Adem Küçük, Ayşe Ayan, Meti̇n Özgen, Uğur Karasu, Servet Yolbaş

Turkish Journal of Medical Sciences

Background/aim: To describe the disease activity and retention rate in rheumatoid arthritis (RA) patients with inadequate response (IR) to conventional synthetic disease-modifying antirheumatic drugs (csDMARDs) and/or tumor necrosis factor inhibitors (TNFis) who were prescribed tocilizumab (TCZ) as first-line or second-line biologic treatment in real-world setting. Materials and methods: Data gathered from patients' files was used in a multicenter and retrospective context. Retention rates and the Disease Activity Score in 28 joints with CRP (DAS28-CRP) were evaluated at time points. The relationship of drug efficacy with factors such as smoking, obesity, and previous use of TNFis was also examined. Results: One …

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Is It Tuberculosis Mastitis Or Granulomatous Mastitis? A Thirteen-Year Experience At A University Hospital, Handan İnönü Köseoğlu, Mehmet Fati̇h Daşiran, Reşi̇t Doğan Köseoğlu, Zeki̇ye Ruken Yüksekkaya Çeli̇kyay, Mehmet Berati̇ Kaleli̇oğlu Jan 2023

Is It Tuberculosis Mastitis Or Granulomatous Mastitis? A Thirteen-Year Experience At A University Hospital, Handan İnönü Köseoğlu, Mehmet Fati̇h Daşiran, Reşi̇t Doğan Köseoğlu, Zeki̇ye Ruken Yüksekkaya Çeli̇kyay, Mehmet Berati̇ Kaleli̇oğlu

Turkish Journal of Medical Sciences

Background/aim: Granulomatous mastitis (GM) is a rare inflammatory disease of the breast. Tuberculosis mastitis (TM), one of the causes of GM, is a rare form of extrapulmonary tuberculosis. The clinical, radiological, and histopathological findings of TM and GM are similar, and sometimes it is difficult to make a distinction between these disease states. In this study, we aimed to evaluate the clinical and radiological features, diagnostic techniques, treatment modalities and treatment outcomes of the patients with GM and TM. Materials and methods: The data of the patients with confirmed GM by histopathologic examination of biopsy specimens between 2007 and 2020 …

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The Effect Of Hydrochlorothiazide On The Recurrence Of Nonmelanoma Skin Cancer: A 7-Year Retrospective Study Comprising 300 Patients, Burak Özkan, Süleyman Savran, Kadri̇ Akinci, Abbas Albayati̇, Pinar İncel Uysal, Ahmet Çağri Uysal Jan 2023

The Effect Of Hydrochlorothiazide On The Recurrence Of Nonmelanoma Skin Cancer: A 7-Year Retrospective Study Comprising 300 Patients, Burak Özkan, Süleyman Savran, Kadri̇ Akinci, Abbas Albayati̇, Pinar İncel Uysal, Ahmet Çağri Uysal

Turkish Journal of Medical Sciences

Background/aim: Hydrochlorothiazide (HCTZ) possesses well-described photosensitizing properties, and a causal association with nonmelanoma skin cancer (NMSC) was recently shown. However, previous studies have not shown whether HCTZ use is associated with the risk of recurrence of basal cell carcinoma (BCC) or squamous cell carcinoma (SCC). This study aims to investigate the association between HCTZ use and recurrence in patients with NMSC. Materials and methods: We identified cases with NMSC from our hospital archives during the period between 2013 and 2019. Patients were divided into groups according to the pathological diagnosis, HCTZ use, and recurrence. Multivariable analysis was performed to determine …

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The Impact Of Smoking On Response To Tumor Necrosis Factor-Α Inhibitor Treatment In Patients With Ankylosing Spondylitis, Handan Yarkan Tuğsal, Gökçe Kenar Artin, Gerçek Can, Sedat Çapar, Berri̇n Zengi̇n, Servet Akar, Hüseyi̇n Edi̇z Dalkiliç, Abdurrahman Soner Şenel, Süleyman Serdar Koca, Berna Göker, Ayten Yazici, Güzi̇de Nevsun İnanç, Hülya Elli̇dokuz, Nurullah Akkoç, Fatoş Önen Jan 2023

The Impact Of Smoking On Response To Tumor Necrosis Factor-Α Inhibitor Treatment In Patients With Ankylosing Spondylitis, Handan Yarkan Tuğsal, Gökçe Kenar Artin, Gerçek Can, Sedat Çapar, Berri̇n Zengi̇n, Servet Akar, Hüseyi̇n Edi̇z Dalkiliç, Abdurrahman Soner Şenel, Süleyman Serdar Koca, Berna Göker, Ayten Yazici, Güzi̇de Nevsun İnanç, Hülya Elli̇dokuz, Nurullah Akkoç, Fatoş Önen

Turkish Journal of Medical Sciences

Background/aim: To investigate the impact of smoking on disease activity, treatment retention, and response in patients with ankylosing spondylitis (AS) treated with their first tumor necrosis factor-α inhibitor (TNFi). Materials and methods: AS patients who started their first TNFi treatment for the active axial disease (BASDAI ≥ 4) from TURKBIO Registry were included. Treatment response of smoker (current and ex-smokers) and nonsmoker (never smoker) patients were primarily evaluated as achievement of BASDAI50 or improvement in BASDAI at least 20 mm at 3 months and 6 months compared to baseline. Results: There were 322 patients with AS (60% male, 59% smoker, …

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The Effects Of Pilates Training On Abdominal Muscle Thickness And Core Endurance In Patients With Parkinson's Disease: A Single-Blind Controlled Clinical Study, Evri̇m Göz, Seher Özyürek, Burçi̇n Aktar, Berri̇l Dönmez Çolakoğlu, Bi̇rgül Balci Jan 2023

The Effects Of Pilates Training On Abdominal Muscle Thickness And Core Endurance In Patients With Parkinson's Disease: A Single-Blind Controlled Clinical Study, Evri̇m Göz, Seher Özyürek, Burçi̇n Aktar, Berri̇l Dönmez Çolakoğlu, Bi̇rgül Balci

Turkish Journal of Medical Sciences

Background/aim: This study aims at examining the effects of Pilates training on the transversus abdominis (TrA) and internal obliques (IO) muscle thickness and core endurance in different positions in patients with Parkinson's Disease. Materials and methods: Patients were divided into 2 groups as Pilates training (n = 13) and control (n = 10) groups. Pilates training was performed twice a week for 6 weeks. The participants' muscle thickness and core endurance were measured at the beginning of the study (pretraining), and the effectiveness of Pilates training was then assessed in the 6th week (posttraining) and in the 12th-week follow-up. The …

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Menu Recommendation System Using Machine Learning, Kelly Crystine Ferreira Jesus, Leo Jaime Kayser Macieski Jan 2023

Menu Recommendation System Using Machine Learning, Kelly Crystine Ferreira Jesus, Leo Jaime Kayser Macieski

ICT

Developing a recommendation menu system for restaurants based on the restaurant data and/or city food purchase data to help and change the way restaurants build their menu. Using Data Analysis and Machine Learning to build a project that aims to solve the problem of restaurants and chefs when it comes to preparing menus, the latter with ingredients and dishes that encourage their customers to order more, come back and recommend the restaurant. Helping chefs to create dishes for their restaurants with more accuracy and higher probability to be ordered by their customers. The project will cover tools to build the …

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The Role Of Data Analytics To Address Water Stress In Africa, Khalil Beladda Jan 2023

The Role Of Data Analytics To Address Water Stress In Africa, Khalil Beladda

ICT

Water stress, a global concern transcending geographical boundaries, significantly impacts the African continent. Affecting one in three people in Africa, sustainable water management is imperative for ecological and human welfare. This research emphasizes the pivotal role of data analytics in addressing water stress challenges in Africa and beyond.

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Intra-Articular Aav9 Α-L-Iduronidase Gene Replacement In The Canine Model Of Mucopolysaccharidosis Type I, Raymond Yu-Jeang Wang, Shih-Hsin Kan, Haoyue Zhang, Jodi D Smith, Afshin Aminian, Elizabeth Snella, Jackie K Jens, Sarah P Young, Patricia I Dickson, N Matthew Ellinwood Jan 2023

Intra-Articular Aav9 Α-L-Iduronidase Gene Replacement In The Canine Model Of Mucopolysaccharidosis Type I, Raymond Yu-Jeang Wang, Shih-Hsin Kan, Haoyue Zhang, Jodi D Smith, Afshin Aminian, Elizabeth Snella, Jackie K Jens, Sarah P Young, Patricia I Dickson, N Matthew Ellinwood

2020-Current year OA Pubs

Mucopolysaccharidosis type I (MPS I), an inherited lysosomal storage disorder characterized by deficiency of

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Development Of Holographic Recording Material For Fabrication Of Solar Concentrators For Micro Satellites, Brian Rogers Jan 2023

Development Of Holographic Recording Material For Fabrication Of Solar Concentrators For Micro Satellites, Brian Rogers

Doctoral

Holographic solar concentration has been a topic of increasing interest over recent years because of the lightweight and physically compact nature of holograms, which gives them an advantage over other, conventional concentration methods. As holographic recording materials develop further, their characteristics prove to meet the demands required of them to make more effective holographic solar concentrators. The development of photovoltaics in tandem with holographic materials has led to a host of solar concentrating device designs that take advantage of the unique properties of diffractive optics. Compared to refractive optics, holographic devices are more lightweight and compact. This makes holographic devices …

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Non-Linear Modelling Of Internal Geophysical Waves, Joseph Cullen Jan 2023

Non-Linear Modelling Of Internal Geophysical Waves, Joseph Cullen

Doctoral

Geophysical waves are waves that are found naturally in the Earth’s atmosphere and oceans. Internal waves, that act as an interface between fluids of different density are examples of geophysical waves. The system set-up will incorporate a model with a flat bottom, flat surface and internal wave. The system has a depthdependent current which mimics a typical ocean set-up and, as it is based on the surface of the rotating Earth, includes Coriolis forces. Using well established fluid dynamic techniques, the total energy is calculated and used to determine the dynamics of the system using a procedure called the Hamiltonian …

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Towards The Development Of A Balanced Legislative Framework For Consumer Data Protection In Electronic Commerce: The Case Of The Sultanate Of Oman, Talib Al Kharusi Jan 2023

Towards The Development Of A Balanced Legislative Framework For Consumer Data Protection In Electronic Commerce: The Case Of The Sultanate Of Oman, Talib Al Kharusi

Doctoral

This research aims to investigate whether the law as it currently stands in Oman provides adequate legal protection for personal data, to determine the current obstacles facing the electronic commerce sector, and to identify ways of overcoming such challenges. The empirical focus of this study will be electronic commerce transactions between companies and consumers. In this regard, the research will explore the perceptions of the main stakeholders towards privacy regulation and what implications these have for the growth of electronic commerce in Oman. The privacy that this research aims to explore is a complex issue since it concerns human feelings …

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Novel Therapeutic Approaches To Treat Brain Cancer Combining 3d Cell Culture Models, Cold Atmospheric Plasma And Airborne Acoustic, Janith Wanigasekara Jan 2023

Novel Therapeutic Approaches To Treat Brain Cancer Combining 3d Cell Culture Models, Cold Atmospheric Plasma And Airborne Acoustic, Janith Wanigasekara

Doctoral

Glioblastoma (GBM), an adult-type diffuse grade 4 glioma (IDH wild type), is the most prevalent, aggressive, fatal, highly vascularized, malignant primary brain tumour in adults with a poor prognosis. Despite existing therapies such as surgical resection, radiation therapy and chemotherapy such as temozolomide (TMZ), patient survival remains largely unchanged over the last three decades. There is an urgent need for novel and effective therapeutic strategies that can overcome drug resistance, cross the blood brain barrier, and minimise off-target side effects that can negatively impact a patient's quality of life. The high failure rate of clinical trials is due to inefficient …

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Wear Behavior Of In-Situ Oxide Dispersion Strengthened Fe-8ni Alloy With Zr Additions, Mustafa Tekin, Faiz Muhaffel, Hasan Kotan, Murat Baydoğan Jan 2023

Wear Behavior Of In-Situ Oxide Dispersion Strengthened Fe-8ni Alloy With Zr Additions, Mustafa Tekin, Faiz Muhaffel, Hasan Kotan, Murat Baydoğan

Journal of Metals, Materials and Minerals

In this study, in-situ oxide dispersion strengthened (ODS) Fe91Ni8Zr1 and Fe88Ni8Zr4 alloys were produced by combination of high energy mechanical alloying (HEMA) and high temperature equal channel angular extrusion (HT-ECAE). The wear behaviors of the consolidated samples were investigated under different loads from 1 N to 4 N by reciprocating wear tests at room temperature. The Scanning electron microscopy (SEM) was used to examine the wear tracks to analyze the wear characteristics as a function of applied loads. The relative comparison of the wear results showed that under the lower loads of 1 N and 2 N, Fe88Ni8Zr4 alloy has …

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Examination Of The Adhesion Of The Scale Formed On Hot-Rolled Steel With Different Silicon Content Using A Tensile Test, Seksan Singthanu, Prayoon Surin, Thanasak Nilsonthi, Manop Pipatthattakul Jan 2023

Examination Of The Adhesion Of The Scale Formed On Hot-Rolled Steel With Different Silicon Content Using A Tensile Test, Seksan Singthanu, Prayoon Surin, Thanasak Nilsonthi, Manop Pipatthattakul

Journal of Metals, Materials and Minerals

In the hot-rolling process, steel was subjected to high temperatures which results in the formation of an oxide layer called scale. The oxide scale can be affected to the surface characteristic of the hot-rolled steel product. The scale must be completely removed from the surface of the steel before further processing. This research aimed to examine the adhesion behavior of scale on hot-rolled steel with different silicon contents (0.01, 0.12, 0.18, and 0.29 wt%) using a tensile testing machine with an observation setup. The results showed that the scale thickness decreased with increasing silicon content in the range of 9 …

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Corrosion Of A Spark Plasma Sintered Fe-Cr-Mo-B-C Alloy In 3.5% Nacl Solution, Mudassir Farooq, Sohail Muhammad, A. A. Sorour Jan 2023

Corrosion Of A Spark Plasma Sintered Fe-Cr-Mo-B-C Alloy In 3.5% Nacl Solution, Mudassir Farooq, Sohail Muhammad, A. A. Sorour

Journal of Metals, Materials and Minerals

In this study, the corrosion behavior of a Fe-Cr-Mo-B-C alloy, fabricated by spark plasma sintering of an amorphous alloy powder, in 3.5% NaCl solution was analyzed. Electrochemical impedance spectroscopy and potentiodynamic polarization are techniques which were used for electrochemical performance estimation of samples and the results were further compared with conventional alloys: 1080 carbon steel and 304 stainless steel. Corrosion surface products were characterized through Scanning electron microscopy, Energy dispersive x-ray spectroscopy and X-ray photoelectron spectroscopy. Specimens sintered at 800℃ (S1-800) had achieved 94% densification approximately while the sample sintered at 900℃ (S2-900), had densified more which was 98% approximately. …

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Synthesis Of Zircon Pigments From Rice Husk Ash And Their Performance In Ceramic Glaze, Niti Yongvanich, Peerapat Soysom, Worachet Ratkasemsak Jan 2023

Synthesis Of Zircon Pigments From Rice Husk Ash And Their Performance In Ceramic Glaze, Niti Yongvanich, Peerapat Soysom, Worachet Ratkasemsak

Journal of Metals, Materials and Minerals

ZrSiO4-based pigments have been known to be very stable in ceramic glazes but require a high firing temperature required for phase formation. This study examined the feasibility of using rice husk waste as a substitute for crystalline SiO2. The amorphous form of silica with some impurities was obtained by calcining the rice husk at 800℃. The general chemical formula were (Zr0.9M0.1)SiO4, where M = V, Pr, Fe and Cr. The solid-state processing was achieved by firing at 1300℃ for 12 h with NaF (5 wt%). X-ray Diffraction revealed a lower relative fraction between ZrO2 (secondary phase) and ZrSiO4 in the …

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Investigation Of Surface Hardness And Roughness On Formability Of Aluminum Alloy Sheet Aa2024-T3 Subjected To The Shot Peening Process By Silica Shots, Jurarat Sawangpan, Sansot Panich, Tanakorn Jantarasricha, Anak Khantachawana Jan 2023

Investigation Of Surface Hardness And Roughness On Formability Of Aluminum Alloy Sheet Aa2024-T3 Subjected To The Shot Peening Process By Silica Shots, Jurarat Sawangpan, Sansot Panich, Tanakorn Jantarasricha, Anak Khantachawana

Journal of Metals, Materials and Minerals

Shot peening is one type of modified surface treatment that produces a residual compressive stress on the material subsurface and improves surface properties while generating plastic deformation on the surface. This research work aims to improve surface properties, which include the enhanced material formability of aluminum alloy 2024-T3 sheet having 1.2 mm of thickness, by providing residual compressive stress on the surface using the shot peening process, which uses silica particles of 0.1 mm in diameter. First, shot peening was performed using various process parameters: compressed air, distance from nozzle to target, and duration time. Based on the obtained peening …

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Development Of Inexpensive Device For Methanol Detection In Hand Sanitizer Gel Using Manganese-Doped Zinc Sulfide Quantum Dots Modified By N-Methylpolypyrrole, Sophanat Khenthaphak, Pakorn Juleang, Wanida Wonsawat, Orawon Chailapakul, Eakkasit Punrat Jan 2023

Development Of Inexpensive Device For Methanol Detection In Hand Sanitizer Gel Using Manganese-Doped Zinc Sulfide Quantum Dots Modified By N-Methylpolypyrrole, Sophanat Khenthaphak, Pakorn Juleang, Wanida Wonsawat, Orawon Chailapakul, Eakkasit Punrat

Journal of Metals, Materials and Minerals

A method for methanol detection by an inexpensive device using a nanomaterial modified by N-methylpolypyrrole (NMPPY) has been developed. Manganese-doped zinc sulfide quantum dots (Mn/ZnS-QDs) were synthesized and then characterized by a fluorescence spectrophotometer to study their spectroscopic properties. Mn/ZnS-QDs were modified with NMPPy and studied by digital-image colorimetry to optimize conditions for methanol detection. A 2 mL of 3000 mg∙L–1 Mn/ZnS-QDs modified with 300 μL of 1000 mg∙L-1 of NMPPy was chosen to be a detecting reagent for methanol determination. Under the optimum conditions, the linear range was found to be 2%v/v to 50%v/v of methanol with R-square of …

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Surface Modification Of Activated Carbon From Sago Waste, Khaeriah Dahlan, Yane Oktovina Ansanay, Alda Filadelfi Runggaweri, Marlifon Merani Jan 2023

Surface Modification Of Activated Carbon From Sago Waste, Khaeriah Dahlan, Yane Oktovina Ansanay, Alda Filadelfi Runggaweri, Marlifon Merani

Journal of Metals, Materials and Minerals

In this paper, we analyzed the effect of surface modification on the surface properties of the active carbon from sago waste using varied oxidizers, namely H2O2, HNO3, and H2SO4. The ordinary active carbon has an initial surface area of 546.6 m2∙g-1, with a phenol and carboxylic functional group. The porosity, functional groups and morphological surface, together with the chemical composition of activated carbon were examined using a nitrogen adsorption-desorption through the Brunauer Emmett Teller (BET) method and the calculation of Barret-Joyner-Hall (BJH), a Fourier-transformed infrared spectroscopy, and a scanning electron microscopy with energy dispersive spectroscopy. The results found that the …

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Impact Of Microwave Synthesis Time On The Shape Of Silver Nanostructures And Their Antibacterial Activity, Nhat Hieu Hoang, Van Nghia Nguyen, Thi Tho Nguyen, Thi Mong Diep Nguyen Jan 2023

Impact Of Microwave Synthesis Time On The Shape Of Silver Nanostructures And Their Antibacterial Activity, Nhat Hieu Hoang, Van Nghia Nguyen, Thi Tho Nguyen, Thi Mong Diep Nguyen

Journal of Metals, Materials and Minerals

Silver is a well-known effective antibacterial and disinfectant material with relatively few side effects. Nanosilver derived from it, have strong antibacterial, antifungal and broad-spectrum antiviral properties. This study describes how the microwave synthesis durations of silver nanoparticles affect their shape, and the effect of the shapes of these nanoparticles on their antibacterial activity. The optical properties of the nanosilver were examined through UV-Vis absorption spectroscopy. The morphology of the grain was determined by transmission electron microscopy (TEM), and the crystallinity of the nanosilver was confirmed by X-ray diffraction (XRD). The antibacterial activities were assessed using bacterial pathogens Bacillus cereus and …

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Mechanical Behavior And Physicochemical Modifications In Lignosulfonate-Treated Fique (Furcraea Andina) Fibers, Beatriz Dantas Lourenço Da Silva, Paula Lage Agrize, Betina Carvalho Veiga, Lucio Fabio Cassiano Nascimento, Camila Aparecida Abelha Rocha, Fábio De Oliveira Braga Jan 2023

Mechanical Behavior And Physicochemical Modifications In Lignosulfonate-Treated Fique (Furcraea Andina) Fibers, Beatriz Dantas Lourenço Da Silva, Paula Lage Agrize, Betina Carvalho Veiga, Lucio Fabio Cassiano Nascimento, Camila Aparecida Abelha Rocha, Fábio De Oliveira Braga

Journal of Metals, Materials and Minerals

One of the most frequent problems in biocomposites is the physical/chemical incompatibility between natural lignocellulosic fibers (NLF) and the matrix. Physical and/or chemical treatments are the most common approach to improve interface properties. Seeking for environmentally friendly treatments, lignosulfonates (LSs) have been considered for surface modification of NLF due to their amphiphilic properties. Thus, the objective of the present work is to evaluate the influence of sodium LS (SLS) treatment protocols in the properties and mechanical behavior of fique (Furcraea Andina) fibers. X-ray diffraction (XRD), Thermogravimetric (TGA) and spectroscopic (FTIR) analyzes were performed, as well as optical microscopy, …

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Thermal And Mechanical Evaluation Of Natural Fibers Reinforced Gypsum Plaster Composite, Tugba Mutuk, Kerem Arpacioğlu, Sevim Alişir, Gökhan Demir Jan 2023

Thermal And Mechanical Evaluation Of Natural Fibers Reinforced Gypsum Plaster Composite, Tugba Mutuk, Kerem Arpacioğlu, Sevim Alişir, Gökhan Demir

Journal of Metals, Materials and Minerals

Many problems such as the increase in the world population, global drought, and greenhouse gases have caused materials used in industries to be reconsidered. This is how the concept of green composite material emerged. Using natural fibers to obtain such materials is important in terms of sustainability. This study is aimed to use hemp fiber and banana fiber as natural fiber additives in the gypsum composite to produce green bio-composite. Natural fibers are chemically modified with 5% NaOH solution. In this way, a good fiber/matrix interface interaction is provided. The composite hardness test result of 5 wt% HB fiber added …

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Investigation Of Oxide Scale Adhesion On Hot-Rolled Steel Using The Tensile Test And Acoustic Emission, Seksan Singthanu, Prayoon Surin, Manop Pipathattakul, Thanasak Nilsonthi Jan 2023

Investigation Of Oxide Scale Adhesion On Hot-Rolled Steel Using The Tensile Test And Acoustic Emission, Seksan Singthanu, Prayoon Surin, Manop Pipathattakul, Thanasak Nilsonthi

Journal of Metals, Materials and Minerals

This article addresses applying a tensile test with a CCD camera to assess scale adhesion on hot-rolled steel as a function of hot-rolled coil position. The scale adhesion in this study was shown in the value of the strain initiating the first scale spallation. The result of strain initiating the first scale spallation was confirmed with an acoustic emission (AE) method. The as-received hot-rolled coil was studied at the head, middle, and tail positions. A scanning electron microscope (SEM) and X-ray diffraction (XRD) were used to examine the scale morphology and phase identification respectively. The results show that the oxide …

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Effect Of Nano Cdo-Zno Content On Structural, Thermal, Optical, Mechanical And Electrical Properties Of Epoxy Composites, Chaitra Srikanth, Gattumane Motappa Madhu Jan 2023

Effect Of Nano Cdo-Zno Content On Structural, Thermal, Optical, Mechanical And Electrical Properties Of Epoxy Composites, Chaitra Srikanth, Gattumane Motappa Madhu

Journal of Metals, Materials and Minerals

Cadmium oxide doped zinc oxide nanoparticles were synthesized by solution combustion technique. CdO-ZnO nanoparticles were reinforced into epoxy by ultrasonication technique. CdO-ZnO nano-particles are well known semiconducting materials which are found to exhibit excellent semiconducting behavior even at high frequencies. Hence it was introduced into epoxy to study the semiconducting nature of CdO-ZnO/epoxy composites. The polymer composites exhibited interesting phenomenon such as minimum heat losses at high frequencies indicating semi-conducting behaviour of the composites. The polymer composite was also analysed for its structural, thermal, optical and mechanical properties. The enhanced interaction of CdO-ZnO nanoparticles with epoxy has resulted in superior …

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Synthesis Of Zinc Oxide Photocatalysts From Zinc-Dust Waste For Organic Dye Degradation, Wanwalee Promsuwan, Pornapa Sujaridworakun, Wuttichai Reainthippayasaku Jan 2023

Synthesis Of Zinc Oxide Photocatalysts From Zinc-Dust Waste For Organic Dye Degradation, Wanwalee Promsuwan, Pornapa Sujaridworakun, Wuttichai Reainthippayasaku

Journal of Metals, Materials and Minerals

Zinc-dust waste from a hot-dip galvanizing plant in the metal plating industry was successfully used as the starting material to synthesize zinc oxide (ZnO) nanopowder via a hydrothermal method. Effects of acid types in zinc-dust dissolving process and concentration of NaOH for precipitation on physical characteristics and photocatalytic activity of the synthesized ZnO were investigated. Elemental composition, phase and crystallite size, morphology with chemical composition, and specific surface area of the ZnO nanostructures were characterized by X-ray fluorescence spectroscopy (XRF), X-ray diffraction (XRD), scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS), and gas adsorption-desorption analysis, respectively. The photocatalytic performance …

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