Hüsnü Gerengi - Academia.edu (original) (raw)
Papers by Hüsnü Gerengi
Journal of Materials Engineering and Performance, Dec 17, 2023
Apple Academic Press eBooks, Oct 1, 2023
Journal of Materials Science and Chemical Engineering
Along with the developing technology in the rubber industry, the use of natural and synthetic rub... more Along with the developing technology in the rubber industry, the use of natural and synthetic rubbers as well as liquid rubbers has increased significantly in recent years. The formulation of the tread compound, which directly affects the performance of a tire, is generally produced from natural and synthetic rubbers. Intensive scientific studies have been carried out on liquid rubbers because they reduce the consumption of process oils used in the tire production phase and increase dispersion. In this study, the rheological and physico-mechanical properties of rubbers developed using only liquid rubber (liquid isoprene and liquid SBR) with four different viscosities and without using process oil (Styrene Butadiene Rubber-SBR) were investigated. It has been observed that the rubber blends produced by adding four different liquid rubbers to the same recipe caused changes in rheological and physico-mechanical properties compared to the reference sample. It was observed that the minimum torque/viscosity (ML), maximum torque/viscosity (MH) and curing time (t90) in some of the formulas tested decreased significantly due to the use of liquid rubber.
Protection of Metals and Physical Chemistry of Surfaces
Korozyon inhibitoru olarak 1-etil-3-metilimidazolyum tetrafloroborat (EMITFB) ve 1-butil-1-metilp... more Korozyon inhibitoru olarak 1-etil-3-metilimidazolyum tetrafloroborat (EMITFB) ve 1-butil-1-metilpiperidinyum tetrafloroborat (BMPTFB)’in dusuk karbon celiginin (St37) 0.1 M HCl ortamindaki korozyon mekanizmasina etkisi, Elektrokimyasal Empedans Spektroskopisi (EIS) ve Potansiyodinamik Polarizasyon (TP) yontemleri kullanilarak arastirilmis ve sonuclar kiyaslanmistir. Elektrokimyasal olcumlerden sonra metal yuzeyindeki morfolojik degisiklikler Taramali Elektron Mikroskobu (SEM) ve Enerji Kirinimi X-Isini Spektroskopisi (EDS) yardimiyla analiz edilmistir. Elde edilen bulgular, calisilan her iki bor katyonlu iyonik sivinin ihibitor olarak kullanilabilecegini gostermektedir. St37 celiginin 0.1 M HCl ortamindaki BMPTFB ve EMITFB kullanilmasina bagli olarak hesaplanan inhibitor etkinligi (% IE ) degerleri sirasiyla %87 ve %73’tur. St37 celiginin 0.1 M HCl ortaminda korozyonuna BMPTFB’nin EMITFB’ye kiyasla yaklasik %15 daha iyi korudugu gorulmustur.
The attachment of Glass Fiber Reinforced Concrete (GFRC) materials to building surfaces is critic... more The attachment of Glass Fiber Reinforced Concrete (GFRC) materials to building surfaces is critical for their stability and safety, with anchorage elements playing a vital role. In this study, researchers examined the corrosion of anchor elements in GFRC building facades to evaluate the effectiveness of a zinc-rich coating to prevent corrosion. The study investigated the corrosion formation of samples with and without a paint containing more than 85% Zn, applied as a coating with a 200 µm in the weld region. The researchers subjected embedded galvanized anchor elements coated 30x30x3 mm GFRC to a salt spray test according to ASTM B 117 standards. The corrosion in the weld regions of anchor elements with dimensions of 30x30x3 mm was investigated according to the same standard. The study results show that the corrosion test did not affect GFRC anchor elements according to the ASTM B 117 standard. The zinc-rich coating effectively prevented weld zone corrosion in GFRC facade anchorage elements. These findings contribute to the ongoing efforts to enhance the durability and performance of GFRC materials, which have been widely used in building facades for decorative and insulation purposes for many years.
In conclusion, the use of a zinc-rich coating is a reliable way to prevent weld zone corrosion in GFRC facade anchorage elements, ensuring their safe use and long-term service life. With the increasing demand for sustainable building materials, this study provides valuable information for designers, builders, and manufacturers to optimize the use of GFRC materials in building facades.
Elsevier eBooks, 2021
Abstract Today, many energy sources serve humanity. However, most energy sources, especially petr... more Abstract Today, many energy sources serve humanity. However, most energy sources, especially petroleum products, pose a severe danger to the environment because of the greenhouse gases released after the use of energy, which damage the ozone layer. Hydrogen energy is therefore preferred as a more environmentally friendly energy source. Of course, in this process, solid/liquid hydrogen sources such as NaBH4, NH3BH3, N2H4BH3, and N2H4·H2O are essential for usability. To obtain hydrogen from these sources, nanocatalysts are needed. Thanks to nanocatalysts with a larger surface area, it is possible to obtain hydrogen by a more efficient dehydrogenation. In this chapter, information on the hydrogen production methods and the use of nanocatalysts in hydrogen evolution reactions are compiled. Additionally, the positive and negative aspects of the use of hydrazine borane in hydrogen production were discussed, and environmental and economic considerations were made.
Education Sciences, Mar 1, 2009
In this work, 10 th grade high schools students attached to the Ministry of National Education in... more In this work, 10 th grade high schools students attached to the Ministry of National Education in Düzce were asked 12 questions based on the subjects in Chemistry 1, which required basic knowledge and their knowledge was tested. The results were evaluated by using a questionnaire based on the procedures in Chemistry teaching. We obtained that the experimental methods, which must be used mostly in chemistry teaching, was rarely used. By discussing the difficulties of chemistry education; instead of memorization, some judgments and suggestions are presented to educators and administrators about how to apply the methods by which the students will comprehend, think and make deductions.
Zenodo (CERN European Organization for Nuclear Research), Jun 30, 2023
Korozyon metallerin bulunduğu ortamda özelliğini yitirerek kullanılmaz hale gelmesidir. Korozyon ... more Korozyon metallerin bulunduğu ortamda özelliğini yitirerek kullanılmaz hale gelmesidir. Korozyon olayı endüstrinin her bölümünde kendini göstermektedir. Orman Endüstrisinde birçok yerde metal aksamlar (Çivi, vida, cıvata, ayak ve bağlantı elemanları) kullanılmaktadır. Ancak metal aksamlar zamanla korozyona uğrayarak hem ağaç malzemenin hem de metalik aksamların direnç özelliklerinin düşmesine neden olmaktadır. Bu çalışmanın amacı orman endüstrisi sektöründe meydana gelen korozyonun önemini ve korozyonun neden olduğu ekonomik zararı ortaya koymaktır. Çalışmada orman endüstri mühendisliği alanında korozyonun görüldüğü başlıca alanlar ele alınmış ve bu alanda görülen korozyon hakkında detaylı bilgilere yer verilmiştir. Bu çalışma orman endüstri sektöründe görülen korozyon hakkında ilk bilimsel Türkçe çalışma olması bakımından önem taşımaktadır.
Düzce Üniversitesi bilim ve teknoloji dergisi, Dec 26, 2022
Kauçuk esaslı ürünlerin imalatında kullanılan katkı malzemeleri; zamana, maruz kaldığı fiziksel v... more Kauçuk esaslı ürünlerin imalatında kullanılan katkı malzemeleri; zamana, maruz kaldığı fiziksel ve kimyasal etkilere bağlı olarak üründen kısmen ayrılmaktadırlar. Ortamdan ayrılan bu katkı malzemeleri imal edilen mamulün performansını ve uzun sürede kullanım ömrünü azaltmaktadır. Bu çalışmada aktif ZnO ile normal ZnO kullanılarak üretilen kauçuk malzemelerin maliyet-performans özellikleri incelenmiştir. Bulgular daha yüksek yüzey alanına sahip aktif ZnO tercihiyle, mekanik testlerde %20, toplam mamul ağırlığında %5 ve maliyette %2'e varan bir farklılık hesaplanmıştır.
İleri Teknoloji Bilimleri Dergisi, Nov 30, 2017
Uzun sureli tedavi gerektirmeyen kemik travmalarinda kullanilacak vida ve diger baglanti elemanla... more Uzun sureli tedavi gerektirmeyen kemik travmalarinda kullanilacak vida ve diger baglanti elemanlarinin biyobozunur ozellige sahip magnezyum alasimlardan yapilmasi, ozellikle buyume cagindaki cocuklarda uygulanan, metalik implantlarin zamanla neden oldugu olumsuz etkileri ortadan kaldirmaktadir. Bu calismanin amaci; saf magnezyumun yapay vucut sivisi (SBF) icerisindeki korozyon mekanizmasini 30 saat suren acik devre potansiyeli olcumleri (OCP) ve bu esnada yapilan in- situ pH olcumleriyle arastirmak ve iki yontem arasindaki korelasyonu ortaya koymaktir. Elde edilen veriler calisma elektrotunun yuzeyinde de zamanla olusan Mg(OH) 2 tabakasinin korozyon hizini etkiledigini gostermektedir.
Technological Applied Sciences, Jul 6, 2017
In this study, corrosion mechanism of new alloys produced with addition of niobium and vanadium a... more In this study, corrosion mechanism of new alloys produced with addition of niobium and vanadium at the ratio of 0.05 wt. % and 0.075 wt. % into chemical composition of reference sample was investigated in 3.5% NaCl environment. The Dynamic Electrochemical Impedance Spectroscopy (DEIS) method allowing instantaneous detection of corrosion mechanism was used for the first time with this study for determining the effect of micro alloy elements on corrosion. Surface morphology of the prepared samples were compared with electrochemical data examined by using optical microscope at the end of 15 hour DEIS experiments. According to experimental results, the increase in amount of niobium and vanadium indicated that produced new alloys decreased corrosion rate occurring in 3.5% NaCl environment. R ct value obtained at the end of experiment show increased averagely at rate of 44-57% with the addition of alloy elements. Obtained DEIS data and optical images support each other. It was observed that there were more corrosion and accordingly deformation on surface of sample without addition of alloy elements.
Journal of Adhesion Science and Technology, Jul 6, 2023
On May 12, 2019 we shall celebrate the centenary birthday of the late Professor Wu Wen-Tsün (1919... more On May 12, 2019 we shall celebrate the centenary birthday of the late Professor Wu Wen-Tsün (1919-2017), one of the most famous and influential mathematicians in China. Wu made foundational contributions to the field of topology and established Mathematics Mechanization as a discipline. He devoted himself to an academic career of more than six decades with leadership and extensive activities of research and education across mathematics to computer science and artificial intelligence. The scope of his research spans from algebraic topology, differential topology, and algebraic geometry to automated reasoning, symbolic computation, and game theory, and to the history of mathematics. His early work in topology was a major breakthrough, leading to well-known and now classical results including the characteristic class and formulas named after Wu. In the late 1970s, he pioneered the research of Mathematics Mechanization through his invention of the "Wu method", which revolutionized the field of automated reasoning. Wu received a number of prestigious awards including the Herbrand Award for Distinguished Contributions to Automated Reasoning (1997) and the Shaw Prize in Mathematical Sciences (2006, with David Mumford) for which the Press Release from the Shaw Prize Committee concludes with comments as follows: "Beginning with the traditional mathematical field of geometry, contributing to its modern development, and then moving into the new areas and opportunities which the advent of the computer has opened up, they [Wu and Mumford] demonstrate the breadth of mathematics. Together they represent a new role model for mathematicians of the future • • • " This special issue is dedicated to the celebration of Wu's centenary birthday. It contains 18 papers [1−18] on research subjects to which Wu made important contributions. Problems addressed in the papers include Hilbert's 15th problem and the problems of solving partial differential polynomial systems, automated geometric theorem proving and discovering, global
Journal of Adhesion Science and Technology, Jul 7, 2022
The corrosion behaviour of pure Mg in simulated body fluid (SBF) and the effect of chemical treat... more The corrosion behaviour of pure Mg in simulated body fluid (SBF) and the effect of chemical treatment on the corrosion resistance property were investigated using DEIS (dynamic electrochemical impedance spectroscopy), EIS (electrochemical impedance spectroscopy), PDP (potentiodynamic polarization), SEM (scanning electron microscopy), AFM (atomic force microscope), and pH measurement techniques for 30 h. NaOH or H2O2 were utilized for the chemical treatment. The DEIS was used for the first time in the investigation of Mg corrosion in SBF. Results obtained disclosed that the chemical treatment benefitted the anticorrosion property immensely. Results from both the electrochemical and surface analysis techniques are consistent.
Journal of Materials Engineering and Performance, Jun 16, 2023
Journal of Rubber Research, Sep 1, 2018
Periodicals of Engineering and Natural Sciences (PEN), Mar 16, 2018
Ethylene-propylene-diene monomer (EPDM) is one of the most widely used synthetic rubbers, especia... more Ethylene-propylene-diene monomer (EPDM) is one of the most widely used synthetic rubbers, especially in the automotive industry. Despite its many benefits, the chief weakness of EPDM has been the color change occurring in its products due to ultraviolet (UV) rays. It is recognized that UV energy causes the dissociation of bonds (mostly CC and C-H) in EPDM materials as well as cracks and color changes on the surface. The aim of this study was to investigate the effect of the Tinuvin derivatives widely used as UV stabilizers in the plastics industry on EPDM rubber. The EPDM rubber plates were prepared by adding Tinuvin-P, Tinuvin-213 and Tinuvin-234 as UV absorbers (UVAs) and Tinuvin-123 as hindered amine light stabilizer (HALS) material at a ratio of 1.0 phr (parts per hundred parts of rubber) to an available EPDM formula. The effects of the Tinuvin derivatives were investigated by the internationally recognized Florida outdoor aging test. The surfaces of the EPDM plates were visually scrutinized and surface morphological changes were examined via scanning electron microscopy (SEM), energy dispersive X-ray (EDX) and Fourier transform infrared (FTIR) spectrometry analyses. The results obtained showed that, unlike in the plastic industry, not all Tinuvin derivatives could be used as UV stabilizers for EPDM products. Of all the tested Tinuvin derivatives, the Tinuvin-123 compound was the most effective, indicating it to be suitable for use as a protective UV stabilizer for EPDM rubber applications. Thus, an important issue such as the UV resistance of sealing profiles made by EPDM rubber has been contributed about the suitability of Tinuvin derivatives.
International Journal of Corrosion and Scale Inhibition, Feb 1, 2017
The corrosion behaviour of AISI 316 and AISI 304 stainless steels in Na 2 B 4 O 7 •5H 2 O solutio... more The corrosion behaviour of AISI 316 and AISI 304 stainless steels in Na 2 B 4 O 7 •5H 2 O solutions with various concentrations (3%, 6% and 9% w/w) commonly used in wood industry was investigated by using electrochemical impedance spectroscopy and polarisation techniques. The results reveal that the dissolution pattern of the studied steel samples is in the order 3% > 6% > 9%. The AISI 316 stainless steel is found to exhibit better corrosion resistance than the 304-type stainless steel alloy.
The European Journal of Research and Development, Mar 28, 2023
Civil engineering design, Jan 18, 2023
Journal of Materials Engineering and Performance, Dec 17, 2023
Apple Academic Press eBooks, Oct 1, 2023
Journal of Materials Science and Chemical Engineering
Along with the developing technology in the rubber industry, the use of natural and synthetic rub... more Along with the developing technology in the rubber industry, the use of natural and synthetic rubbers as well as liquid rubbers has increased significantly in recent years. The formulation of the tread compound, which directly affects the performance of a tire, is generally produced from natural and synthetic rubbers. Intensive scientific studies have been carried out on liquid rubbers because they reduce the consumption of process oils used in the tire production phase and increase dispersion. In this study, the rheological and physico-mechanical properties of rubbers developed using only liquid rubber (liquid isoprene and liquid SBR) with four different viscosities and without using process oil (Styrene Butadiene Rubber-SBR) were investigated. It has been observed that the rubber blends produced by adding four different liquid rubbers to the same recipe caused changes in rheological and physico-mechanical properties compared to the reference sample. It was observed that the minimum torque/viscosity (ML), maximum torque/viscosity (MH) and curing time (t90) in some of the formulas tested decreased significantly due to the use of liquid rubber.
Protection of Metals and Physical Chemistry of Surfaces
Korozyon inhibitoru olarak 1-etil-3-metilimidazolyum tetrafloroborat (EMITFB) ve 1-butil-1-metilp... more Korozyon inhibitoru olarak 1-etil-3-metilimidazolyum tetrafloroborat (EMITFB) ve 1-butil-1-metilpiperidinyum tetrafloroborat (BMPTFB)’in dusuk karbon celiginin (St37) 0.1 M HCl ortamindaki korozyon mekanizmasina etkisi, Elektrokimyasal Empedans Spektroskopisi (EIS) ve Potansiyodinamik Polarizasyon (TP) yontemleri kullanilarak arastirilmis ve sonuclar kiyaslanmistir. Elektrokimyasal olcumlerden sonra metal yuzeyindeki morfolojik degisiklikler Taramali Elektron Mikroskobu (SEM) ve Enerji Kirinimi X-Isini Spektroskopisi (EDS) yardimiyla analiz edilmistir. Elde edilen bulgular, calisilan her iki bor katyonlu iyonik sivinin ihibitor olarak kullanilabilecegini gostermektedir. St37 celiginin 0.1 M HCl ortamindaki BMPTFB ve EMITFB kullanilmasina bagli olarak hesaplanan inhibitor etkinligi (% IE ) degerleri sirasiyla %87 ve %73’tur. St37 celiginin 0.1 M HCl ortaminda korozyonuna BMPTFB’nin EMITFB’ye kiyasla yaklasik %15 daha iyi korudugu gorulmustur.
The attachment of Glass Fiber Reinforced Concrete (GFRC) materials to building surfaces is critic... more The attachment of Glass Fiber Reinforced Concrete (GFRC) materials to building surfaces is critical for their stability and safety, with anchorage elements playing a vital role. In this study, researchers examined the corrosion of anchor elements in GFRC building facades to evaluate the effectiveness of a zinc-rich coating to prevent corrosion. The study investigated the corrosion formation of samples with and without a paint containing more than 85% Zn, applied as a coating with a 200 µm in the weld region. The researchers subjected embedded galvanized anchor elements coated 30x30x3 mm GFRC to a salt spray test according to ASTM B 117 standards. The corrosion in the weld regions of anchor elements with dimensions of 30x30x3 mm was investigated according to the same standard. The study results show that the corrosion test did not affect GFRC anchor elements according to the ASTM B 117 standard. The zinc-rich coating effectively prevented weld zone corrosion in GFRC facade anchorage elements. These findings contribute to the ongoing efforts to enhance the durability and performance of GFRC materials, which have been widely used in building facades for decorative and insulation purposes for many years.
In conclusion, the use of a zinc-rich coating is a reliable way to prevent weld zone corrosion in GFRC facade anchorage elements, ensuring their safe use and long-term service life. With the increasing demand for sustainable building materials, this study provides valuable information for designers, builders, and manufacturers to optimize the use of GFRC materials in building facades.
Elsevier eBooks, 2021
Abstract Today, many energy sources serve humanity. However, most energy sources, especially petr... more Abstract Today, many energy sources serve humanity. However, most energy sources, especially petroleum products, pose a severe danger to the environment because of the greenhouse gases released after the use of energy, which damage the ozone layer. Hydrogen energy is therefore preferred as a more environmentally friendly energy source. Of course, in this process, solid/liquid hydrogen sources such as NaBH4, NH3BH3, N2H4BH3, and N2H4·H2O are essential for usability. To obtain hydrogen from these sources, nanocatalysts are needed. Thanks to nanocatalysts with a larger surface area, it is possible to obtain hydrogen by a more efficient dehydrogenation. In this chapter, information on the hydrogen production methods and the use of nanocatalysts in hydrogen evolution reactions are compiled. Additionally, the positive and negative aspects of the use of hydrazine borane in hydrogen production were discussed, and environmental and economic considerations were made.
Education Sciences, Mar 1, 2009
In this work, 10 th grade high schools students attached to the Ministry of National Education in... more In this work, 10 th grade high schools students attached to the Ministry of National Education in Düzce were asked 12 questions based on the subjects in Chemistry 1, which required basic knowledge and their knowledge was tested. The results were evaluated by using a questionnaire based on the procedures in Chemistry teaching. We obtained that the experimental methods, which must be used mostly in chemistry teaching, was rarely used. By discussing the difficulties of chemistry education; instead of memorization, some judgments and suggestions are presented to educators and administrators about how to apply the methods by which the students will comprehend, think and make deductions.
Zenodo (CERN European Organization for Nuclear Research), Jun 30, 2023
Korozyon metallerin bulunduğu ortamda özelliğini yitirerek kullanılmaz hale gelmesidir. Korozyon ... more Korozyon metallerin bulunduğu ortamda özelliğini yitirerek kullanılmaz hale gelmesidir. Korozyon olayı endüstrinin her bölümünde kendini göstermektedir. Orman Endüstrisinde birçok yerde metal aksamlar (Çivi, vida, cıvata, ayak ve bağlantı elemanları) kullanılmaktadır. Ancak metal aksamlar zamanla korozyona uğrayarak hem ağaç malzemenin hem de metalik aksamların direnç özelliklerinin düşmesine neden olmaktadır. Bu çalışmanın amacı orman endüstrisi sektöründe meydana gelen korozyonun önemini ve korozyonun neden olduğu ekonomik zararı ortaya koymaktır. Çalışmada orman endüstri mühendisliği alanında korozyonun görüldüğü başlıca alanlar ele alınmış ve bu alanda görülen korozyon hakkında detaylı bilgilere yer verilmiştir. Bu çalışma orman endüstri sektöründe görülen korozyon hakkında ilk bilimsel Türkçe çalışma olması bakımından önem taşımaktadır.
Düzce Üniversitesi bilim ve teknoloji dergisi, Dec 26, 2022
Kauçuk esaslı ürünlerin imalatında kullanılan katkı malzemeleri; zamana, maruz kaldığı fiziksel v... more Kauçuk esaslı ürünlerin imalatında kullanılan katkı malzemeleri; zamana, maruz kaldığı fiziksel ve kimyasal etkilere bağlı olarak üründen kısmen ayrılmaktadırlar. Ortamdan ayrılan bu katkı malzemeleri imal edilen mamulün performansını ve uzun sürede kullanım ömrünü azaltmaktadır. Bu çalışmada aktif ZnO ile normal ZnO kullanılarak üretilen kauçuk malzemelerin maliyet-performans özellikleri incelenmiştir. Bulgular daha yüksek yüzey alanına sahip aktif ZnO tercihiyle, mekanik testlerde %20, toplam mamul ağırlığında %5 ve maliyette %2'e varan bir farklılık hesaplanmıştır.
İleri Teknoloji Bilimleri Dergisi, Nov 30, 2017
Uzun sureli tedavi gerektirmeyen kemik travmalarinda kullanilacak vida ve diger baglanti elemanla... more Uzun sureli tedavi gerektirmeyen kemik travmalarinda kullanilacak vida ve diger baglanti elemanlarinin biyobozunur ozellige sahip magnezyum alasimlardan yapilmasi, ozellikle buyume cagindaki cocuklarda uygulanan, metalik implantlarin zamanla neden oldugu olumsuz etkileri ortadan kaldirmaktadir. Bu calismanin amaci; saf magnezyumun yapay vucut sivisi (SBF) icerisindeki korozyon mekanizmasini 30 saat suren acik devre potansiyeli olcumleri (OCP) ve bu esnada yapilan in- situ pH olcumleriyle arastirmak ve iki yontem arasindaki korelasyonu ortaya koymaktir. Elde edilen veriler calisma elektrotunun yuzeyinde de zamanla olusan Mg(OH) 2 tabakasinin korozyon hizini etkiledigini gostermektedir.
Technological Applied Sciences, Jul 6, 2017
In this study, corrosion mechanism of new alloys produced with addition of niobium and vanadium a... more In this study, corrosion mechanism of new alloys produced with addition of niobium and vanadium at the ratio of 0.05 wt. % and 0.075 wt. % into chemical composition of reference sample was investigated in 3.5% NaCl environment. The Dynamic Electrochemical Impedance Spectroscopy (DEIS) method allowing instantaneous detection of corrosion mechanism was used for the first time with this study for determining the effect of micro alloy elements on corrosion. Surface morphology of the prepared samples were compared with electrochemical data examined by using optical microscope at the end of 15 hour DEIS experiments. According to experimental results, the increase in amount of niobium and vanadium indicated that produced new alloys decreased corrosion rate occurring in 3.5% NaCl environment. R ct value obtained at the end of experiment show increased averagely at rate of 44-57% with the addition of alloy elements. Obtained DEIS data and optical images support each other. It was observed that there were more corrosion and accordingly deformation on surface of sample without addition of alloy elements.
Journal of Adhesion Science and Technology, Jul 6, 2023
On May 12, 2019 we shall celebrate the centenary birthday of the late Professor Wu Wen-Tsün (1919... more On May 12, 2019 we shall celebrate the centenary birthday of the late Professor Wu Wen-Tsün (1919-2017), one of the most famous and influential mathematicians in China. Wu made foundational contributions to the field of topology and established Mathematics Mechanization as a discipline. He devoted himself to an academic career of more than six decades with leadership and extensive activities of research and education across mathematics to computer science and artificial intelligence. The scope of his research spans from algebraic topology, differential topology, and algebraic geometry to automated reasoning, symbolic computation, and game theory, and to the history of mathematics. His early work in topology was a major breakthrough, leading to well-known and now classical results including the characteristic class and formulas named after Wu. In the late 1970s, he pioneered the research of Mathematics Mechanization through his invention of the "Wu method", which revolutionized the field of automated reasoning. Wu received a number of prestigious awards including the Herbrand Award for Distinguished Contributions to Automated Reasoning (1997) and the Shaw Prize in Mathematical Sciences (2006, with David Mumford) for which the Press Release from the Shaw Prize Committee concludes with comments as follows: "Beginning with the traditional mathematical field of geometry, contributing to its modern development, and then moving into the new areas and opportunities which the advent of the computer has opened up, they [Wu and Mumford] demonstrate the breadth of mathematics. Together they represent a new role model for mathematicians of the future • • • " This special issue is dedicated to the celebration of Wu's centenary birthday. It contains 18 papers [1−18] on research subjects to which Wu made important contributions. Problems addressed in the papers include Hilbert's 15th problem and the problems of solving partial differential polynomial systems, automated geometric theorem proving and discovering, global
Journal of Adhesion Science and Technology, Jul 7, 2022
The corrosion behaviour of pure Mg in simulated body fluid (SBF) and the effect of chemical treat... more The corrosion behaviour of pure Mg in simulated body fluid (SBF) and the effect of chemical treatment on the corrosion resistance property were investigated using DEIS (dynamic electrochemical impedance spectroscopy), EIS (electrochemical impedance spectroscopy), PDP (potentiodynamic polarization), SEM (scanning electron microscopy), AFM (atomic force microscope), and pH measurement techniques for 30 h. NaOH or H2O2 were utilized for the chemical treatment. The DEIS was used for the first time in the investigation of Mg corrosion in SBF. Results obtained disclosed that the chemical treatment benefitted the anticorrosion property immensely. Results from both the electrochemical and surface analysis techniques are consistent.
Journal of Materials Engineering and Performance, Jun 16, 2023
Journal of Rubber Research, Sep 1, 2018
Periodicals of Engineering and Natural Sciences (PEN), Mar 16, 2018
Ethylene-propylene-diene monomer (EPDM) is one of the most widely used synthetic rubbers, especia... more Ethylene-propylene-diene monomer (EPDM) is one of the most widely used synthetic rubbers, especially in the automotive industry. Despite its many benefits, the chief weakness of EPDM has been the color change occurring in its products due to ultraviolet (UV) rays. It is recognized that UV energy causes the dissociation of bonds (mostly CC and C-H) in EPDM materials as well as cracks and color changes on the surface. The aim of this study was to investigate the effect of the Tinuvin derivatives widely used as UV stabilizers in the plastics industry on EPDM rubber. The EPDM rubber plates were prepared by adding Tinuvin-P, Tinuvin-213 and Tinuvin-234 as UV absorbers (UVAs) and Tinuvin-123 as hindered amine light stabilizer (HALS) material at a ratio of 1.0 phr (parts per hundred parts of rubber) to an available EPDM formula. The effects of the Tinuvin derivatives were investigated by the internationally recognized Florida outdoor aging test. The surfaces of the EPDM plates were visually scrutinized and surface morphological changes were examined via scanning electron microscopy (SEM), energy dispersive X-ray (EDX) and Fourier transform infrared (FTIR) spectrometry analyses. The results obtained showed that, unlike in the plastic industry, not all Tinuvin derivatives could be used as UV stabilizers for EPDM products. Of all the tested Tinuvin derivatives, the Tinuvin-123 compound was the most effective, indicating it to be suitable for use as a protective UV stabilizer for EPDM rubber applications. Thus, an important issue such as the UV resistance of sealing profiles made by EPDM rubber has been contributed about the suitability of Tinuvin derivatives.
International Journal of Corrosion and Scale Inhibition, Feb 1, 2017
The corrosion behaviour of AISI 316 and AISI 304 stainless steels in Na 2 B 4 O 7 •5H 2 O solutio... more The corrosion behaviour of AISI 316 and AISI 304 stainless steels in Na 2 B 4 O 7 •5H 2 O solutions with various concentrations (3%, 6% and 9% w/w) commonly used in wood industry was investigated by using electrochemical impedance spectroscopy and polarisation techniques. The results reveal that the dissolution pattern of the studied steel samples is in the order 3% > 6% > 9%. The AISI 316 stainless steel is found to exhibit better corrosion resistance than the 304-type stainless steel alloy.
The European Journal of Research and Development, Mar 28, 2023
Civil engineering design, Jan 18, 2023