Добірка наукової літератури з теми "Alloy creation"

We have developed the refinement process of the microstructure of metallic materials by imposition of electromagnetic vibration force during solidification. This process is effective for both wrought magnesium alloys and cast ones. By simultaneous imposition of a static magnetic field of 10 Tesla under an alternative electric current of 60A, the average grain sizes of the AZ31B wrought alloy and the AZ91D cast alloy were obtained about 50 micron in both alloys. The grain size was affected by electric current frequency and had the minimum value at the special electric current frequncy of 500 to 2000 Hz and 900 Hz for wrought alloy and cast alloy, respectively. From experimental results, we suggested the mechanism of refinement of microstructure during solidification by imposition of electromagnetic vibration force. The cavitation phenomenon in liquid phase during electromagnetic vibration was effective to break down th esolid phase. And also the difference of electric conductivity between the solid phase and the liquid one brought vigorous vibration of the solid phase. Then the solid phase was suppressed its growth.

We have developed the new process for refinement of metallic materials during solidification without addition of refiners or without rapid cooling. This process uses electromagnetic body force based on the vibrations caused by simultaneous imposition of direct magnetic field and alternative electric current on the alloy melt during solidification. The vibrations create cavitation in the melt and it breaks out during growth of it. Then explosive force is released toward the surroundings such as the primary solid particles and they are fractured finely. Finally fractured solid particles solidified as very fine grains. This process was applied to hyper- and hypo-eutectic Al-Si alloys, and AZ91D Mg alloys. Primary silicon crystals in Al-17mass%Si alloy decreased the size remarkably by the optimum electromagnetic vibration condition. Primary aluminum dendrites particles in Al-7mass%Si and primary magnesium dendrite particles in AZ91D are also decreased its size markedly. This process has also been applied to create non-equilibrium state metallic materials such as metallic glasses. We have succeeded to obtain metallic glasses in Mg-Y-Cu alloy system and Fe-Co-Si-B-Nb alloy system. These alloys solidified as fully crystals in this cooling rate without electromagnetic vibrations. These glasses are bulky and are used as structural material.

Recent advances in synthesis of titanium (Ti) alloy powders by direct reduction methods (meltless Ti) have led to new opportunities to produce Ti alloys with enhanced capabilities. The meltless Ti alloy powders can be consolidated into mill products, or used to manufacture near-net shape (NNS) components. A vision is outlined for creation of a new supply chain producing meltless Ti alloy powders, leading to the production and application of innovative turbine engine components. This paper highlights the benefits of meltless Ti alloys, details current assessment of meltless Ti alloy technology, and outlines some of the challenges to fully establish the new supply chain.

Few will doubt that in the East Mediterranean world and in the Near East the development of metallurgy was an important factor (though certainly not the only one) in the evolution of socio-economic organization in the Late Chalcolithic and especially in the Early and Late Bronze Age. The availability of silver, lead and gold added markedly to the possibilities of the acquisition of prestigious objects by the few, to developments in the concept of wealth and in the development of hierarchical societies. The availability of copper, arsenical copper, and later, tin bronze made possible the production of tools which transformed certain crafts (perhaps particularly carpentry and shipbuilding) and, with the development of weapons, revolutionized warfare.This no doubt led to something of an arms race which put its own pressures on societies in the search for and exploitation of metals. The more successful population groups will have greatly increased the density of their population and changed their structure, not only by moving from local chief to regional monarch but also by that monarch securing his authority by the creation of dependent privileged groups and by the encouragement of the emergence of specialized workers and craftsmen. In turn such socio-economic developments, in which the emergence of class differentiation led to the creation of aristocracies or other forms of elite ruling classes, eventually provided the environments in which skilled metal workers could find the time, necessary incentives and artistic inspiration to develop advanced metalworking skills.

Titanium and titanium alloys have been extensively studied for many applications in the area of bone tissue engineering. However, dense titanium is prone to lead into aseptic loosening due to their high elastic modulus compared to natural bone. One way to lower the elastic modulus is to produce a porous structure of the metallic alloy by adjusting its porosity. Another concern is the bioinertness of titanium that have no direct chemical bonding with surrounding tissue. One approach to improve the healing process is the application of a calcium phosphate coating onto the surface of biomedical devices and implants. Biomimetic creation of surface using alkali heat treatment with silica addition was employed in this study. The porosity of the samples ranges from 60% to 70%. It was demonstrated that the biomimetic methods are suitable for inducing apatite on the titanium alloys surface.

In the current study, tin-promoted Pd / MWNTs synthesized via polyol process were developed. TEM images evidences resulted in the formation of highly-dispersed Pd-Sn nanoparticles. The formation of Pd2Sn structural phase was confirmed by XRD and TPR techniques, composed mainly of intermetallic spe-cies, supported by XPS results. In this research, we applied intermetallic-containing tin-promoted catalysts for the selective hydrogenation reaction of acetylene as the case study. The presence of a discontinuity in the Arrhenius plots could come from the kinetic factor as a result of change in acetylene coverage on Pd metallic ensembles. The intermetallic-containing assembled catalysts led to the good management of cata-lytic performance due to the creation of isolated adsorption sites on the catalyst surface, resulting in the higher ethylene selectivity. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35214

Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.17.03 – Технічна електрохімія. – Національний технічний уні-верситет “Харківський політехнічний інститут”, Харків, 2019. Дисертаційну роботу присвячено розробці технології електроосадження функціональних покривів сплавами заліза з кобальтом і молібденом з комплек-сних цитратних електролітів. За результатами аналізу іонних рівноваг і кінетичних закономірностей встановлено, що молібден відновлюється у сплав з ферумом та кобальтом до металевого стану з гетероядерних комплексів через утворення проміжних сполук як внаслідок катодної поляризації, так і ад-атомами водню за рахунок реалізації спілловер-ефекту. Варіювання режимів і параметрів електролізу дозволяє формувати композитні металоксидні покриви в системі ферум-кобальт-молібден інкорпорацію до складу металевої матриці оксидів молібдену, як інтермедіатів електродних реакцій. Обґрунтовано кількісний склад електроліту та режими нанесення покривів із заданим вмістом компонентів, морфологією, структурою та експлуатаційними характеристиками. Визначено оптимальні режими поляризації, застосування яких дозволяє отримувати бездефектні покриви. Корозійний опір покривів системи Fe–Co–Mo(МоОₓ) перевищує значення для сплавотвірних компонентів, а мікротвердість майже втричі вища за мікротвердість матеріалу основи та індивідуальних компонентів тернарної системи. Високу електрокаталітичну активність покривів виявлено в катодних реакціях виділення водню, яка внаслідок реалізації синергетичного ефекту вища порівняно із індивідуальними металами і зростає з вмістом молібдену, а активність покривів Fe–Co–Mo(МоОₓ) в анодних реакціях окиснення низькомолекулярних спиртів за густиною струмів анодних і катодних піків навіть вища, ніж на платині. Покриви є “магнітом’якими матеріали”, які можна застосовувати у виробництві магніто-оптичних інформаційних накопичувачів, а сенсорні властивості щодо окремих компонентів газових середовищ використано для створення чутливого елемента сенсора. Запропоновано технологічну схему електроосадження покривів Fe–Co–Mo(МоОₓ) залежно від їх практичного призначення.
Thesis for the degree of Candidate of Technical Sciences in the speciality 05.17.03 – Technical еlectrochemistry. – National Technical University “Kharkiv Polytechnic Institute” Kharkiv, 2019. The dissertation is devoted to the development of technology for electrodeposition of functional coatings by alloys of iron with cobalt and molybdenum from complex citrate electrolytes. Based on the analysis of ionic equilibria and kinetic laws, it was found that molybdenum is converted into an alloy with iron and cobalt to a metallic state from heteronuclear complexes through the formation of intermediate spokes both as a result of cathodic polarization and as a result of the formation of hydrogen and hydrogen atoms. realize overflow effect. Changing the modes and parameters of electrolysis allows the formation of composite metal oxide coatings in iron-cobalt-molybdenum system by including a metal matrix of molybdenum oxide as an intermediate link of electrode reactions. The quantitative composition of the electrolyte and the modes of coating with a given content of components, morphology, structure and operational characteristics are justified. The optimal polarization modes are determined, the use of which allows one to obtain defect-free coatings. The corrosion resistance of the coatings of the Fe-Co-Mo(MoOₓ) system exceeds the value for the alloy components, and the microhardness is three times higher than the microhardness for steel and individual components of the ternary system. High electrocatalytic activity of the coatings was found in cathodic hydrogen evolution reactions, which, as a result of the synergistic effect, is higher than for individual metals, and grows with the molybdenum content and the activity of Fe-Co-Mo (MoOₓ). Coatings in the reactions of anodic oxidation of low molecular weight alcohols at a current density of the anodic and cathodic peaks are even higher than on a platinum electrode. The coatings turned out to be "soft magnetic materials" that can be used in the manufacture of magneto-optical information storage devices, and the sensory properties of individual components of gaseous media were used to create a sensitive element of the sensor. The technological scheme of electrodeposition of Fe-Co-Mo (MoOₓ) coatings is proposed, depending on their practical purpose.

Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.17.03 – Технічна електрохімія. – Національний технічний університет «Харківський політехнічний інститут», Харків, 2019. Дисертаційну роботу присвячено розробці гальванохімічної технології покривів тернарними сплавами і композитами системи ферум-кобальт-молібден з підвищеним рівнем функціональних властивостей на підставі гіпотези про інкорпорацію оксидів тугоплавких компонентів як інтермедіатів електродних реакцій, до складу металевої матриці. Обґрунтовано компонентний склад електроліту та співвідношення концентрацій сплавотвірних компонентів в системі ферум-кобальт-молібден і закономірності комплексоутворення в присутності цитрату, які склали підгрунтя до розробки електролітів для нанесення металевих і металооксидних покривів. Встановлено, що бездефектні покриви високої якості з вмістом молібдену понад 30 ат.% формуються з електролітів із концентрацією натрій цитрату 0,4−0,5 М та оксометалату 0,2 М. Доведено, що утворення гетероядерних комплексів є передумовою для гнучкого керування іонними рівновагами в розчині, а відтак, і механізмом та перенапругою електродних реакцій, перебіг яких підпорядковується закономірностям змішаної кінетики, про що свідчать і визначена енергія активації процесу. Відновлення молібдат-іону до металевої фази відбувається через утворення поверхневих оксидів проміжного ступеню окиснення. Залежно від повноти перебігу цього процесу створюються умови до формування металевого покриву тернарним сплавом або металоксидного композиту, друга фаза якого складається з оксидів молібдену в проміжному ступені окиснення, тобто утворюється безпосередньо в електродному процесі. Встановлено, що відновлення оксометалату може перебігати в декілька стадій − як за електрохімічним, так і хімічним механізмом за участю ад-атомів гідрогену, які утворюються в катодній реакції. Саме така особливість забезпечує варіативність катодного процесу та надає можливість гнучкого керування перебігом окремих стадій і складом та властивостями цільового продукту технологічного процесу. Головними чинниками, що забезпечують варіативність складу покривів, є режим поляризації – гальваностатичний або імпульсний, та амплітудні і часові параметри струму. За однакових густин струму застосування імпульсного електролізу дозволяє формувати покриви із значно вищим вмістом молібдену. Зокрема, за сталих тривалості імпульсу 10-20 мс та паузи 5–20 мс склад покривів збагачується молібденом до 30 ат. % при суттєво нижчому вмісті оксигену. Такі зміни у складі покриву порівняно з стаціонарним режимом зумовлені перебігом впродовж паузи хімічної реакції відновлення проміжних оксидів молібдену ад-атомами водню внаслідок реалізації спілловер-ефекту. Вища кількість фази оксидів в складі покривів тернарним сплавом, сформованих в гальваностатичному режимі, дає підстави класифікувати їх як композити. За однакового типу поляризації струмозалежними виявились не тільки вміст компонентів сплаву/композиту, а й морфологія поверхні осадів та вихід за струмом. В умовах стаціонарного електролізу вихід за струмом сплаву знаходиться в межах 56−62 %, а при застосуванні імпульсного електролізу ефективність процесу зростає до 61−70 % за рахунок внеску хімічної реакції відновлення оксидів молібдену ад–атомами водню. Розсіювальна здатність електроліту також залежить від густини струму і має екстремальний характер із максимумом у 62 % при і=2,5 А/дм². Отримані результати розсіювальної здатності узгоджуються із значеннями для відомих електролітів. Композитні Fe−Co−MoОₓ і металеві Fe−Co−Mo покриви мають дрібноглобулярну структуру поверхні, розвиненість якої зростає зі збільшенням густини струму, а характер і розмір кристалітів залежить від складу покривів і режимів електролізу. Так, для покривів Fe48Сo40Mo12, отриманих постійним струмом, середній розмір кристалітів становить 63 Ǻ, а для покриву Fe43Сo39Mo18, отриманому в імпульсному режимі, середній розмір кристалітів складає 56 Ǻ. Залежно від режимів електроосадження різниться і шорсткість поверхні – в гальваностатичному та імпульсному режимах параметр Ra для сплавів становить 0,15 і 0,11, відповідно, що характерно для 9–10 класів шорсткості. Синтезовані покриви мають широкий спектр фізико-хімічних і фізико-механічних властивостей з високим рівнем споживчих характеристик. Так, тестуванням корозійної тривкості встановлено, що за глибинним показником (0,018 – 0,02 мм/рік) покриви мають 4 бал стійкості за десятибальною шкалою, а ранжовані за густиною струму корозії є "стійкими" в кислому середовищі та "вельми стійкими" у нейтральному та лужному. Корозійну стійкість в кислому середовищі підвищує наявність молібдену через кислотний характер його оксидів, а в нейтральному і лужному середовищах покриви проявляють стійкість внаслідок пасивації феруму і кобальту. Вільна енергія поверхні металевих покривів і композитів в межах 118−128 мДж/м², що майже на порядок величини нижча за сплавотвірні компоненти, а поверхні композитів Fe−Co−MoОₓ нижча ніж сплаву Fe−Co−Mo завдяки вищому вмісту кисню в його структурі, внаслідок чого покриви композитами є хімічно стійкішими. Мікротвердість гальванічних покривів знаходиться в межах 595 – 630 кгс/мм² і є вищою, порівняно із сплавотвірними компонентами, а також в 2,5–3 рази більшою за сталеву основу. Мікротвердість осадів симбатно змінюється із вмістом молібдену і в інтервалі досліджених густин струму також зростає з підвищенням цього параметра. Результатами комплексних випробувань механічних характеристик доведено високу адгезію покривів до поверхні підкладки, стійкість до полірування, нагріву і зламу. Встановлено високу електрокаталітичну активність тернарного сплаву в анодних реакціях окиснення низькомолекулярних спиртів, а значення анодних і катодних піків струму на циклічних вольтамперограмах навіть вищі за платиновий електрод, тому гальванічні покриви сплавом Fe−Co−Mo можна розглядати як перспективні каталітичні матеріали паливних елементів. Високу електрокаталітичну активність покривів виявлено і в катодних реакціях виділення водню з лужних та кислих середовищ, яка внаслідок реалізації синергетичного ефекту вища порівняно із індивідуальними металами. Встановлено залежність між складом сплаву і каталітичними властивостями – більший вміст молібдену в цілому покращує якість покривів. Водночас, густина струму обміну реакції виділення водню на композитних покривах в усіх модельних розчинах вище, ніж для металевих, що узгоджується з результатами визначення виходу за струмом. Покривам притаманні магнітні властивості, а значення коерцитивної сили для покривів Fe−Co−Mo знаходиться в інтервалі 7−10 Ое, що перевищує значення для бінарного Fe−Co сплаву (6,5–7,2 Ое). Сплави Fe−Co−Mo, як "магнітом’які матеріали", можна застосовувати і у виробництві елементів магнітних інформаційних накопичувачів. Означений сплав виявляє сенсорні властивості щодо окремих компонентів газових середовищ та може бути використаний, зокрема, як матеріал чутливого елемента сенсора для визначення граничної концентрації водню. На підставі визначених кінетичних характеристик і технологічних струмозалежних параметрів створено програмний і технологічний модулі і запропоновано варіативну технологічну схему нанесення покривів Fe−Co−Мо(МоОₓ) керованого складу та прогнозованими фізико-механічними і фізико-хімічними властивостями. За результатами дослідно-промислових випробувань виробів та елементів обладнання з покривами тернарними сплавами на ПАТ "Укрндіхіммаш" та в Метрологічному центрі військових еталонів Збройних Сил України доведено високий рівень експлуатаційних характеристик синтезованих покривів та ефективність технології їх нанесення. Результати досліджень впроваджені в навчальний процес кафедри фізичної хімії НТУ "ХПІ" і Військового інституту танкових військ НТУ "ХПІ".
Thesis for the degree of Candidate of Technical Sciences in the speciality 05.17.03 – Technical Electrochemistry. – National Technical University «Kharkiv Polytechnic Institute» Kharkiv, 2019. The component composition of the electrolyte and the ratio of the concentrations of the alloys forming components in the ferum-cobalt-molybdenum system and the regularities of the complex formation in the presence of citrate, which became the basis for the development of electrolytes for metal deposition and metal oxide coatings are substantiated. It was found that high-quality coatings with a molybdenum content of more than 30 at.% Are formed from electrolytes with a concentration of sodium citrate of 0,4 – 0,5 М and oxometalate of 0,2 М. It is proved that the formation of heteronuclear complexes is a prerequisite for the flexible control of ionic equilibria in solution, the mechanism and overvoltage of electrode reactions, the course of which obeys the laws of mixed kinetics, which is confirmed and determined by the activation energy of the process. The reduction of the molybdate ion to the metal phase occurs by the formation of surface oxides of an intermediate oxidation state. Depending on the completeness of the course of this process, conditions are created for the formation of a metal coating of a ternary alloy or a metal oxide composite, the second phase of which consists of molybdenum oxides in an intermediate oxidation state, that is, is formed directly in the electrolysis process. The reduction of oxometalate can occur in several stages using both the electrochemical and chemical mechanisms, which include hydrogen ad-atoms and atoms that are formed in the cathodic reaction. It is this feature that provides the variability of the cathode process and allows flexible control of the stages, as well as the composition and properties of the product of the technological process. The main factors ensuring variability of the coating composition are polarization modes — galvanostatic and pulsed modes, and amplitude and time parameters of the current. At the same current densities, the use of pulsed electrolysis allows the formation of coatings with a significantly higher molybdenum content. In particular, with a constant pulse duration of 10–20 ms and pauses of 5–20 ms, the composition of the shells is enriched in molybdenum to 30 at.% With a significantly lower oxide content. Such changes in the composition of the coating compared with the stationary regime are due to the chemical reaction of the reduction of intermediate molybdenum oxides by hydrogen atoms as a result of the overflow effect. The higher content of the oxide phase in the composition of tournament alloys formed in the galvanostatic mode allows us to classify them as composites. With the same polarization mode, the parameters depending on the current are determined not only by the content of the components of the alloy or composite, but also by the morphology of the coating surface and the current efficiency. Under the conditions of stationary electrolysis, the efficiency of the alloy is in the range 56−62 %, and when using pulsed electrolysis, the efficiency of the process increases to 61–70 % due to the chemical reaction of the reduction of molybdenum oxides. hydrogen atoms of hydrogen. The dissipated ability of the electrolyte also depends on the current density and is extreme in nature with a maximum of 62% at i = 2.5 A/dm². Dissipation results are consistent with known electrolytes. Composite coatings Fe−Co−MoOₓ and metallic coatings Fe−Co−Mo have a fine-crystalline structure, surface development increases with increasing current density, and the nature and size of crystallites depends on the composition of the coatings and electrolysis conditions. So for Fe48Co40Mo12 coatings obtained by direct current, the average crystallite size is 63 Ǻ, and for Fe43Co39Mo18 coatings obtained in a pulsed mode, the average crystallite size is 56 Ǻ. Depending on the electrodeposition modes, the surface roughness also varies - in the galvanostatic and pulsed modes, the parameter Ra for the alloys is 0,15 and 0,11, respectively, which corresponds to grades 9-10. The synthesized coatings have a range of physico-chemical and physico-mechanical properties with a high level of performance. Thus, corrosion resistance testing shows that the depth of the index (0,018 – 0,02 mm/year) coatings are characterized as 4 points of resistance on a ten-point scale, and ranked according to the density of the corrosion current is "stable" in acidic solutions and "very stable" in neutral and alkaline solutions. Corrosion resistance to the acid solutions increases the presence of molybdenum through the acidic nature of its oxides, and in neutral and alkaline solutions the covers exhibit resistance due to passivation of iron and cobalt. The free energy of the surface of metal coatings and composites is in the range of 118-128 mJ/m², which is almost an order of magnitude lower than the alloys of the component and the surfaces of the Fe−Co−MoOₓ composites lower than the Fe−Co−Mo alloy due to the higher oxygen content in its structure. , causing the composites to be chemically stable. The microhardness of galvanic coatings is in the range of 595–630 kgf/mm² depending on the individual components and is 2,5–3 times higher than for steel. The microhardness of the coatings increases symbatically with an increase in the amount of molybdenum in the alloy and also increases with an increase in this parameter in the integral of current densities. The high adhesion of the coatings to the surface of the steel, resistance to polishing, heating and kink is established. The high electrocatalytic activity of ternary alloys in the reactions of anodic oxidation of low molecular weight alcohols was established, and the magnitude of the peaks of the anodic and cathodic currents in the cyclic voltammogram is even higher than that of the platinum electrode, so galvanic coatings with Fe−Co−Mo alloy can be considered a promising catalytic material for fuel cells. High electrocatalytic activity of the skin was also detected in cathodic reactions of hydrogen evolution from alkaline and acidic media, which is higher as a result of the synergistic effect compared to individual metals. A connection was established between the alloy composition and catalytic properties – a higher molybdenum content usually improves the quality of coatings. At the same time, the exchange current density of the hydrogen evolution reaction on composite coatings in all model solutions is higher than for metal coatings, which is consistent with the results of determining the current efficiency. The coatings have magnetic properties, and the value of the coercive force for Fe—Co−Mo coatings is in the range of 7-10 Oe, which is higher than the value for the Fe−Co alloy (6,5-7,2 Oe). Fe−Co−Mo alloys are "Magnetic materials" and can be used in the production of magnetic information storage elements. The alloy has sensory properties on the individual components of the gas environment and can be used, in particular, as a sensor material of the sensor to determine the maximum hydrogen concentration. Based on kinetic characteristics and technological parameters, software and technological module have been created and a variable technological scheme for applying Fe−Co−Mo(MoOₓ) coatings of controlled composition and predicted physicomechanical and physicochemical properties has been proposed. According to the results of tests and elements of equipment coated with ternary alloys at PJSC "Ukrndikhimmash" and at the Metrological center of military standards of the Armed Forces of Ukraine, a high level of operational characteristics of the synthesized coatings and the effectiveness of the technology for their synthesis have been proved. The research results were introduced into the educational process of the Department of Physical Chemistry NTU "KhPI" and the Military Institute of Tank Troops NTU "KhPI".

Mimicking facial structures for a robotic head requires integration of multiple structural and mechanical parameters, design, synthesis and control of muscle actuation, architecture of the linkages between actuation points within skin, and implementation of the deformation matrix with respect to global skull coordinates. In this dissertation, humanoid faces were designed and fabricated to investigate all the parameters mentioned above. A prototype face and neck was developed using servo motors and extensively characterized. In this prototype, a neck mechanism was designed using a four bar mechanism to achieve nodding and turning motions. The modular neck prototype simplifies the assembly and statically in equilibrium and hence demands less torque from the cost-effective RC servo motor. The mechanism was critically investigated for dynamic performance and it was found out that RC servo based robotic head requires a PD external controller to overcome inherent overshoot. The servo based robotic head was analyzed for design and control of anchor, architecture of linkages between actuation points within skin, and deformation matrix with respect to global coordinate for creating specific expressions. A functional relationship between deformation vector of facial control points and actuator parameter, skin elasticity and angular position of actuator was derived. The developed analysis method is applicable to any rotary actuator technology utilized for facial expressions and takes into account the skin stiffness. The artificial skin materials for facial expression were synthesized using platinum-cured silicone elastomeric material (Reynolds Advanced Materials Inc.) with base consisting of mainly polyorganosiloxanes, amorphous silica and platinum-siloxane complex compounds. Systematic incorporation of porosity in this material was found to lower the force required to deform the skin in the axial direction. The performance of the servo motor based face was quite realistic but it suffers from the drawback of large power consumption, bulky, heavy, and limited functionality. Thus, significant effort was made in developing a Biometal fiber and Flexinol shape memory alloy actuator (SMA) based biped mountable baby head facial structure which resembles the form and functionality of a human being. SMAs were embedded inside a skull and connected to elastomeric skin at control points. An engineered architecture of skull was fabricated that incorporates all the muscles with their 35 routine pulleys, two fire wire CMOS cameras that serve as eyes, and a battery powered microcontroller base driving circuit within the total dimensions of 140 mm x 90 mm x 110 mm. The driving circuit was designed such that it can be easily integrated with biped and processed in real-time. The humanoid face with 12DOF was mounted on the body of DARwIn (Dynamic Anthropomorphic Robot with Intelligence) robot which has 21 DOF resulting in a total of 33 DOF system. Characterization results on the face and associated design issues are described that provide pathways for developing human-like facial anatomy. Numerical simulation using Simulink was conducted to assess the performance of a prototypic robotic face mainly focusing on jaw movement. A graphical method “Graphical Facial Expression Analysis and Design (GFEAD)” was developed that can be used to allocate the sinking points on robotic head. The method assumes that the origin of the action units are known prior and the underlying criterion in the design of faces being deformation of a soft elastomeric skin through tension in anchoring wires attached on one end to the sinking point and on the other to the actuator. Experimental characterization on a prototyping humanoid face was performed to validate the model and demonstrate the applicability on a generic platform. During characterization of the SMA based face, it was found that the currently available artificial muscle technologies do not meet the entire requirement for being embedded in the skin and provide the required strain rate, maximum strain, blocking force, response time and energy density. Thus an effort was made to develop conducting polymer based artificial muscles which can meet the metrics of human muscle. Composite stripe and zigzag actuators consisting of a sandwich structure polypyrrole /poly(vinylidene difluoride) (PPy/PVDF) were synthesized using potentiodynamic film growth on gold electrodes. The synthesis was done from an aqueous solution containing tetrabutylammonium Perchlorate (TBAP) and pyrrole by polymerization at room temperature. For depositing thin PPy films and thereby minimizing the response time, an experimental optimization of the deposition conditions was performed. The number of current-potential (potentiodynamic) growth cycles and the thickness of the deposited PPy film were highly correlated in the initial stages of polymer film growth. Strip actuator of size 11 x 5 mm2 with 63μM exhibited a deflection of 3mm under 1V DC voltage and 2mm deflection under 8V AC voltage at 0.5 Hz. It was found that three-segment zigzag actuator of segment length 15x2.5mm and thickness 63μM amplifies the displacement by 1.5 times. A study was also conducted on the synthesis and characterization of thick and thin film polypyrrole (PPy) – metal composite actuators. The fabrication method consisted of three steps based upon the approach proposed by Ding et al.: (i) winding the conductive spiral structure around the platinum (Pt)-wire core, (ii) deposition of PPy film on the Pt-wire core, and (iii) removal of the Pt-wire core. This approach yielded good performance from the synthesized actuators, but was complex to implement due to the difficulty in implementing the third step. To overcome the problem of mechanical damage occurring during withdrawal of Pt-wire, the core was replaced with a dispensable gold coated polylactide fiber that could be dissolved at the end of deposition step. Experimental results indicate that thin film actuators perform better in terms of response time and blocking force. A unique muscle-like structure with smoothly varying cross-section was grown by combining layer by layer deposition with changes in position and orientation of the counter electrode in reference to the working electrode. Synthesis of polypyrrole–metal coil was conducted in aqueous solution containing 0.25 M Pyrrole, 0.10 M TBAP and 0.50 M KCl. The actuator consisted of a single layer of platinum winding on a core substrate. Electrochemical characterization for free strain and blocking stress was conducted 0.1 M TBAP solution and a 6% free strain was obtained at an applied potential of 6V DC after 80 s stimulation time. The blocking stress 18 kPa was estimated by extrapolating the strain magnitude on stress-strain diagram. For axial type actuator with coil winding, a generalized governing equation for the electrochemical stress generated from polypyrrole–metal coil which accommodates the effect of magnetic field due to winding was proposed and numerically studied. It was considered as insightful modeling.
Ph. D.

The purpose of this qualitative study was to use grounded theory and case study methodology to identify and describe the ways that an upper elementary school teacher makes students feel known and respected for who they are by creating a relationship-driven classroom community. Analyzing how a teacher uses a relationship-driven classroom community has the potential to improve upon existing classroom community models. Data were collected from a teacher questionnaire, student questionnaire, samples of student work, document collection, two formal interviews with ten students, two formal interviews the teacher, and descriptive field notes from observations. Results indicated creating teacher-student relationships that make students feel known and important has the potential to offset the issues resulting from the disconnect between teachers and students and could lead to greatly improved student achievement. The results also provide new directions in the following areas: (a) teacher-student relationships, i.e., making students feel known and important; (b) creating classroom communities that are formed around teacher-student relationships; and (c) accounting for the mismatch between teachers and students.

The purpose of this qualitative study was to use grounded theory and case study methodology to identify and describe the ways that an upper elementary school teacher makes students feel known and respected for who they are by creating a relationship-driven classroom community. Analyzing how a teacher uses a relationship-driven classroom community has the potential to improve upon existing classroom community models. Data were collected from a teacher questionnaire, student questionnaire, samples of student work, document collection, two formal interviews with ten students, two formal interviews the teacher, and descriptive field notes from observations. Results indicated creating teacher-student relationships that make students feel known and important has the potential to offset the issues resulting from the disconnect between teachers and students and could lead to greatly improved student achievement. The results also provide new directions in the following areas: (a) teacher-student relationships, i.e., making students feel known and important; (b) creating classroom communities that are formed around teacher-student relationships; and (c) accounting for the mismatch between teachers and students.

碩士
銘傳大學
商業設計學系碩士班
99
Abstract In recent years, our government advocated a tactic in which every village needs to showcase their distinguishing characteristic. Because of the trend of nostalgia, people like to travel to those villages which have many historical and cultural characteristics. This tactic and trend promotes traditional industries through brand redesigning. For example, Wan-Hwa’s special culture industry is the herb alley. The history of herb alley began when the Chinese started moving to Taiwan. The medical system was poor at that time. People took medical tags which had prescription from the temple. Therefore, there were many street vendors selling green herbs nearby the Lung-Shan temple. As time passed, those street vendors made up the herb alley. The green herb is a traditional medicine in China, and it has a long history. The medicine was created five thousand years ago when human civilization there began. It was impacted by weatern medication in 19th century, and the green herb’s use slowly declined in 20th century. In order to protect and publicize the green herb, researchers wanted to let more people know about the green herb via brand name and packaging redesign. It would collect the materials and investigate herb alley in Wan-Hwa. In addition, they would analyze the element of herb packages in Wan-Hwa and good Chinese medicine packages. Therefore combining the advantages of the packages and creating the new one which had more herb couture. This allowed people to easily recognize this traditional medicine through packages and treasure it.

The monograph is devoted to improving the efficiency of forming tools made from the most used tool materials: high-speed steels and hard alloys. For tools made of high-speed steels, a comparative assessment of the standards of industrially developed countries and the Russian Federation was carried out. The characteristic of operational and technological properties is given. High-speed steels and technologies are recommended to increase the efficiency of the tool. Recommendations on the types of tools are given. The properties of hard alloys and the areas of their rational application are analyzed. The structural materials of prefabricated and soldered tools are considered. Recommendations on the choice of hard alloys are given, directions for the creation of new compositions of hard alloys to increase the efficiency of the tool in the processing of hard-to-process heat-resistant steels and alloys are shown. It is intended for engineering, technical and scientific workers of the metallurgical and manufacturing industries. It can be used in the preparation of masters, postgraduates of technological universities.

This monograph presents basic theoretical and applied issues of the process of electron beam heat treatment, cladding and welding in various industries. Reviewed hardware and technological aspects, peculiarities of formation of structure of metals and alloys, as well as the patterns of change of such physical-mechanical properties, such as hardness, wear resistance, corrosion resistance, thermal conductivity. The specific examples of the electron beam to create a strengthening and protective coatings. Can be recommended as a textbook for students of technical universities, engineers and researchers and practical workers in the field of welding production.

The culture industry should become attractive for capital investment through the development of organizational-economic mechanisms of support in the form of integrated structures as well as through the development of mechanisms of its financing: systems of culture multi-channel backing and state-private partnership which would allow to create prerequisites for the appearance and implementation of new ideas and projects in the culture field, contributing to culture sphere formation as a full-fledged source of state income. As a result of this project implementation, original new fundamental theoretical assumptions and empirical data in the culture industry field and the regional development will be obtained. The project focuses on the study of fundamental basics research of the culture industry functioning, solves scientific problems of the culture industry effectiveness evaluation and direction justification of its support and funding; there are being worked out strategies and mechanisms of the culture industry efficiency development and increase in accordance with the characteristics and needs of regional economies.

The monograph is devoted to the study of methods of diagnostics and control of corporate risks associated with the formation and use of estimated reserves and liabilities in commercial organizations. The research results are aimed at creating a corporate system for identifying and controlling corporate risks using estimated reserves and estimated liabilities. The methodological recommendations offered by the authors on verification of accrued expenses allow us to identify the risks of inefficient use of expenses, including fraudulent actions. The methodological tools are supplemented with empirical materials obtained during testing of the internal audit methodology in industrial organizations, audit companies, as well as when performing research work. It will be useful for researchers, researchers, teachers, applicants for scientific degrees, and can also be used in the system of additional professional education, advanced training, for self-development of management personnel of financial and economic services in business and government structures.

This is a unique visual book created by the best techniques of modern education. It presents the basic laws and formulas for all sections of physics with a huge number of interactive additions, explanations, illustrations, charts, graphs, tables, and drawings, allowing you to learn the material more efficiently. A clear and concise style of writing focuses the reader's attention in the target material, and numerous exercises, control questions and tasks allow you to securely fix in the memory the knowledge. Additional materials for all sections of General physics course available to You on the Internet in ABS Znanium.com. Using your mobile device, scan the QR code and get it on your smartphone or tablet access to comprehensive information throughout the course of physics in the media formats. In addition, on the YouTube channels "Salisylate and Isminimal from rocky" (from "the Russian Creative Internet") hosted a large number of additional training materials and videos used in this book. Interactive Handbook is intended for use in the educational activities of teachers and students of technical specialties of full-time and distance learning forms, as well as students of technical schools and secondary schools.

The new values, acquisition of which constitutes my act of self-creation, must be either continuous or discontinuous with the ones I already have. If they are continuous, I am not changing but rather working out the implications of the person I already was. If they are discontinuous and the new values contradict or come at a tangent to my old values, the change is not a product of my agency. I change, but I do not change myself. This paradox, adapted from the work of Galen Strawson, can be solved if we allow that the direction of value-dependence may be teleological: the aspirant’s values depend on, and are entailed by, those of the person she is trying to be. The aspirant does not fashion, control, or make the self she creates. Instead, she looks up to that self, tries to understand her, endeavors to find a way to her.

Recently, a number of co-creation approaches and techniques have been proposed for supporting innovation processes. These range from traditionally organized ideation workshops within an organization, to implementation of open innovation methods that allow the involvement of various external and globally distributed partners. Particularly in dynamic and emerging industries, innovation seems necessary, with both closed and open approaches being applied. This chapter provides an empirical study on idea contests with customers and employees of a large telecommunications provider in Austria, and provides insight into the commercial feasibility of ideas, their origin, and likelihood, as well as how social media tools support community building during idea generation. Aiming at developing basic managerial implications on how to apply crowdsourcing effectively, we compare the outcomes of open, semi-open, and closed co-creation approaches, and discuss the importance of lead users and idea-sponsors. We find evidence for offline community building and other aspects supporting organizational crowdsourcing.

This chapter explores how creative survival, reciprocity and solidarity allow for mitigating extractive practices and the military rule that is put in place in rural areas. These practices represent forms of reappropriation, simultaneously delegitimising political order, and hence subverting it. The chapter illustrates that despite the context of violence, popular classes still aspire to improve their conditions of living in terms of political participation and economic distribution. In contrast with the last chapter, these practices have women as their protagonists, but as in the previous chapter, they are interconnected with different forms of resistance. This chapter also illustrates the pre-existing democratic configurations of order and how national and international strategies largely operate by disregarding them.

Abstract This chapter reflects on the learnings from the three co-creation projects featured in this book and attends to the central research questions posed in the introduction. In sum, the chapter presents nine learning points. These cover very different aspects of co-creation ranging from the different roles local government, social care service providers, intermediaries and older citizens may assume, to the implications of embedding co-creation processes in existing service portfolios and strategic policies. The chapter furthermore reflects on different types of co-creation methods (e.g. cultural probes, data tables, data walks) and how they allow for meaningful participation and sharing of knowledge. Ultimately the chapter considers to what extent the openness of a co-creation process impacts on the sustainability of its results and the ways in which co-creation may contribute to joint socio-technical future-making.

Abstract This chapter reviews key literature and concepts relating to the co-creation of digital public services. For this task, it is firstly important to consider what kind of digital public services may be suitable for co-creation. In order to do so, the first section of this chapter defines what a digital public service is (e.g. with respect to different types of service providers, different types of services and service delivery) and considers what kind of digital public services allow for meaningful citizen participation. To better conceptualise different degrees of participation, the subsequent section reviews Arnstein’s (1969) “ladder of citizen participation” and related work. This allows distinguishing between different degrees of non-participation, (consultative) participation and beyond. Thirdly, the chapter reviews traditional participatory approaches that provide the basis to co-creating of digital public services: (1) co-production of public services, (2) co-design and (3) civic open data use. The chapter summarises and compares the different rationales for participation in these approaches, and reviews how they understand the sharing of control, the sharing of knowledge and the enabling of change.

AbstractOne important behavioral aspect of collaborative embedded systems (CESs) is their trustworthiness, which can be assessed at runtime by evaluating their software and system components virtually. The key idea behind trust evaluation at runtime is the assessment of system interactions and consideration of an extended set of actors that influence the dynamicity of these systems. In this sense, the behavior of collaborative embedded systems and collaborative system groups (CSGs) is part of a more complex behavior of digital ecosystems that form around the collaborating systems. One way of performing runtime virtual evaluation of such complex behavior is through the implementation of digital twins (DTs). DTs are executable models fed with real-time data that allow behavior to be observed and analyzed in concrete technical situations. The use of digital twins enables goals to be evaluated in holistic scenarios at three different levels: strategic level, tactical level, and operational level, as we present in this chapter.

AbstractThe chapter discusses the concept of socially responsible innovations and links it to the third mission of universities, understood in terms of social engagement of the higher education institutions. It presents the case study of the EIT Food RIS Consumer Engagement Labs project (funded by the European Institute of Innovation and Technology, EIT, in the framework of Regional Innovation Scheme, RIS). The project has been rolled out to 14 European countries. It serves as a successful example of universities orchestrating the process of co-creation of new products, which involves consumers and producers. The process aimed to address societal challenges and serve the needs of a vulnerable group of senior citizens by developing new food products, proposed by the elderly consumers and matching their specific needs and requirements. It looks at the project experiences through the lenses of inclusion and responsiveness, which allow the universities to combine social responsibility with commercially attractive innovations. Universities involved in the project were playing the role of “interpreters”, linking companies and consumers, facilitating the creative activities and ensuring the methodological and ethical soundness of the co-creation processes.

AbstractEffective collaboration of embedded systems relies strongly on the assumption that all components of the system and the system itself operate as expected. A level of trust is established based on that assumption. To verify and validate these assumptions, we propose a systematic procedure that starts at the design phase and spans the runtime of the systems. At design time, we propose system evaluation in pure virtual environments, allowing multiple system behaviors to be executed in a variety of scenarios. At runtime, we suggest performing predictive simulation to get insights into the system’s decisionmaking process. This enables trust to be created in the system part of a cooperation. When cooperation is performed in open, uncertain environments, the negotiation protocols between collaborative systems must be monitored at runtime. By engaging in various negotiation protocols, the participants assign roles, schedule tasks, and combine their world views to allow more resilient perception and planning. In this chapter, we describe two complementary monitoring approaches to address the decentralized nature of collaborative embedded systems.

Oxide-dispersion-strengthened (ODS)alloys have been identified as one promising candidate alloy type for high temperature reactor applications. Understanding irradiation stability of ODS alloys relies on atomic scale modeling such as molecular dynamics simulations. In this study, yttrium and oxygen charges in Y2O3 oxide particles, which are embedded in pure Fe matrix, are optimized to achieve stabilities observed in experiments. Deviation from the optimized charges causes self-explosion and instability of oxide particles. Molecular dynamics simulations further show that under such optimized charge conditions, damage cascade creation and defect developments can be appropriately modeled.

Titanium alloy (Ti6Al4V (ASTM F-136)) is typically used for modular hip implant stems. This highly corrosion resistant alloy forms passive surface oxide films spontaneously. However, with modular designs, micro-motion may occur at the taper junctions during mechanical loading. Complex physical/chemical reactions take place which may result in pitting and crevice corrosion. Crevices between the taper junctions may allow the body fluids to enter and remain stagnant. These conditions make the modular tapers susceptible to fatigue and mechanically assisted crevice corrosion. When two or more surfaces are in close proximity, it leads to the creation of a locally blocked region in which enhanced dissolution may occur. The in vivo degradation of metal alloy implants compromises the structural integrity. Stochastic modeling of crevice corrosion is performed based on the mechanism behind the phenomenon. Sensitivity analysis is performed, and conclusions drawn.

Non-degradable steel and titanium implants used to replace defects of the locomotor system or fabricate vascular stents provide maximum stability but have too many drawbacks. However; the defects in oxide layer and the corrosive nature of physiological environment, the thermodynamic tendencies make the alloys susceptible to release of cationic species in the form of corrosion, which result in triggering various biological factors and compromises the mechanical integrity of the implanted materials. Currently, biodegradable magnesium alloys are considered as promising materials for creation of fixation devices in orthopedics and cardiovascular surgery. In this work, zinc (Zn) and eggshell (ES) reinforced biodegradable magnesium alloy (Mg–2.5Zn), and environment concise (eco) composite (Mg–2.5Zn–xES) was fabricated using disintegrated melt deposition (DMD) technique. In vitro experiments were conducted to explore the effect variable concentration of ES ( 3 and 7 wt%) on the biodegradation behavior of Mg–Zn alloy using simulated body fluid (SBF) at 37 ℃. The corrosion behavior of the Mg–2.5Zn–xES alloys was explored in SBF solution using different techniques such as weight loss measurement, hydrogen evolution, potentiodynamic polarization, electrochemical Impedance Spectroscopy (EIS). EIS revealed increased in vitro degradation of the biodegradable magnesium alloy, and ecofriendly composite as the percentage of ES reinforcement was increased. X-ray diffraction (XRD) was performed to observe the chemical composition of elements and reaction products present in the degraded samples after the corrosion process.

Shot peening (SP) is a mechanical surface treatment commonly performed to improve the fatigue behavior through creation of compressive residual stresses close to surface and work hardening of the surface material. Notwithstanding wide application of shot peening in the industrial environment, the determination of optimal peening condition for Ti alloys is still more an art than a science, taking into account that there is not a well established method to choose the process parameters in order to enhance the fatigue behavior. In this paper a comprehensive numerical and experimental study is presented aimed at finding the optimized peening conditions based on characterization of surface layer of material after multiple impacts. The numerical simulations provide a quantitative description of shot peening effects in terms of residual stress field and thickness of work-hardened surface layer. Comparison with numerical results, obtained by means of X-ray diffraction (XRD), shows a very good correspondence. Finally the results of experimental bending fatigue tests, performed on shot peened specimens by means of Rumul Cracktronics machine, confirm that shot peening significantly increases the fatigue strength of the considered Titanium alloy.

One of the primary difficulties to implementing NiTi shape memory alloys as robotic actuators is reliably amplifying their low linear strain to large effective displacements. Bowden tubes, called “push-pull cables” in other industries, allow a long length of Shape Memory Alloy (SMA) wire to fit in a small space; this provides a method for increasing effective SMA actuator strain without compromising space or complexity of the entire mechanism. The mechanical advantage of the Bowden tube provides faster actuation speeds, but comes at a cost of increased thermal capacitance resulting in higher power consumption. A feedback control system has been formed comprising the Bowden tube actuator, a rotary platform, and a microcontroller. The controller heats the SMA by passing current through the SMA wire using pulse-width-modulation. After describing the creation of the electro-mechanical system, its capabilities and limitations are discussed. Linear Parameter Varying (LPV) models of SMA are used to determine the range of characteristics the inherently nonlinear SMA system will exhibit. A sliding mode controller is designed based on these characteristics, and implemented in the prototype. Sliding-mode control is shown to be a powerful tool for SMA control even when system parameters are uncertain.

This paper describes the process of the designing of the Fowler flap with adaptive elements. Modern passenger and transport aircraft use high lift devices for take off and landing. Of great importance for the creation of high lift during take off and landing is the shape and size of the gap between wing and extended Fowler flap. To improve the deformation behaviour of the leading edge of this flap, and to improve the geometry of the gap, it was decided to use shape memory alloy (SMA) actuators in the flap structure. First, the complex finite element model of the passive flap was created and then this model was extended with active elements, which are modelling the SMA actuators. As a result, the complex finite element model of the active flap was obtained. This modelling was done using software MATLAB and a finite element model was created using software ANSYS. The main result of this work is that with help of SMA actuators integrated in the flap it was possible to influence and improve the geometry of the gap between the wing and the extended flap, resulting in the aerodynamic efficiency of this flap being increased.

Recent advances in actuation technology and multifunctional materials have presented a unique opportunity to develop structures that have the ability to morph to a variety of shapes while under significant load constraints. One of the many applications of these “high-authority” systems is for morphing air wings for control and drag reduction. The exciting solution to this is the creation of a statically determinate structure that incorporates linear actuators to produce morphing capabilities. Statically determinate structures satisfy Maxwell’s necessary condition that the number of member forces equal the number of joint equilibrium equations. By imposing this condition on the structure it is possible to actively change the shape of the overall structure without resulting in failure. In a morphing foil, the only induced strain within passive members will be due to the hydrodynamic forces present. Deformation of the truss members is stretch-dominated—they do not experience bending—and thus improve the load carrying capacity of the structure. Of primary interest are Shape Memory Alloy (SMAs) actuators. SMAs are useful for shape morphing concepts where large forces are needed. A prototypical foil has been built around a statically determinate structure that incorporates linear actuators to produce morphing capabilities. These “smart” foils have been tested in a wind tunnel to examine their drag reduction capabilities.

This presentation proposal brings recent researches on visuality and its transformations with new technologies. The study shows the analysis of the creative trajectory of some artists that proposed to share their works, allowing for a reflection on the process and on the movements of interaction about how knowledge and artistic sensitivity allow recognizing how a work of art is developed. The research is supported by the ideas of Pierre Levy and Steven Jonhson as collaborators of technical thinking and Fayga Ostrower, who developed analyses on drawing. They are, however, expanded by Cecília Salles; along the work, analytical studies connect such concepts to the creative thinking implied in the development of a work of art. The creative trajectory of the artists analyzed allows us to reflect on the interactions made, understand the choice of the digital software and the different ways of accessing digital tools that represent a communicative way before the environment. In the present study, we have the creative process shared among the following components: the artist as a user and manipulator of the software, the knowledge of the Graphic Interface and the artistic sensitivity of handling, which allow understanding the choices emerging along the entire creative process, such as the selections of the digital software and of the tools that best suit the development. The digital media creates a new niche of knowledge and focus for the research, as it accounts for creating new fields for the human being to act and, therefore, new fields of work. The investigation of new possibilities to work with the digital media is pointed out by Flusser, who shows that human beings have a functional and investigative characteristic they use for creating new inputs for production, since the processing speed in the digital media is undoubtedly extraordinary. The interface is the point of contact between humans and the machine, it is where the relationship between human beings and the digital space occurs, generating, in this exchange, the visual and graphic environment of the digital media. It is thus a communicative space of humans and digital media, where different digital information is found making the software respond to the user needs. To understand how digital resources operate in creation, we conducted a deconstruction of the drawing artistic processes, highlighting details of the digital media added to the knowledge of the Graphic Interface of the types of software under study. The deconstruction conducted in our work allowed understanding the processes involved in creating in digital media and understanding the complexity of conducting the work. The knowledge process is a fundamental point for understanding this network, since we observe in the work completed and delivered to the public, that the actions selected indicate the unfolding of the artist’s trajectory. The approaches employed in our research can expand the processes for studying the subject, in the sense that they certainly deconstruct the solely technical possibilities to highlight the understanding of a creative construction process.

In recent years, there has been development of several significant offshore pipeline projects for the transmission of oil and gas from harsh, deep water environments. The production of gas transmission pipelines for offshore application demands heavy thickness, high strength, lower temperature toughness, good weldability and sour service crack resistance. This paper reports on the experience with the production of linepipe up to 31.8mm in wall thickness grade X70 intended for offshore applications in China. The plate was produced at Shougang Steel’s 4.3 m heavy wide plate mill in Qinhuangdao China (Shouqin). Alloy/processing design along with production parameters are introduced. The achieved mechanical properties in both plate and pipe are reported. The pipe tensile test results in transverse and longitudinal directions achieved yield strength and ultimate tensile strength of 571MPa and 668MPa respectively, which are higher than plate yield and ultimate strengths of 510MPa and 658MPa respectively. The increase of strength during pipe making is due to the creation of a fine uniform acicular ferrite microstructure from the alloy/processing design. Even with this X70 strength level and heavy wall thickness the low temperature fracture toughness achieved was excellent. Transverse charpy impact testing resulted in absorbed average energy of 480 J @ – 20 °C with 100% shear. Drop weight tear testing (DWTT) achieved an average of 94% shear at −15 °C. Evaluation of the heavy gauge X70 sour service performance was performed according to specifications of NACE TM 0284 and DNV-OS-F101 utilizing HIC and SSCC testing in low pH (∼3) solution A. The low carbon, low sulfur, clean steel and homogeneous fine acicular ferrite microstructure had extremely high resistance to HIC and SSCC failure in the testing. All of these results demonstrated that the heavy wall X70 production at Shougang Steel’s 4.3 m wide heavy plate mill (Shouqin) can meet the technical specifications of “The South China Sea Deepwater Gas Development” and DNV-OS-F101.

Citrus is one of the major agricultural crops common to Israel and the United States, important in terms of nutrition, foreign exchange, and employment. The economy of both citrus industries have been chronically plagued by diseases caused by Citrus tristeza virus (CTV). The short term solution until virus-resistant plants can be used is the use of mild strain cross-protection. We are custom designing "ideal" protecting viruses to immunize trees against severe isolates of CTV by purposely inoculating existing endangered trees and new plantings to be propagated as infected (protected) citrus budwood. We crossed the substantial technological hurdles necessary to accomplish this task which included developing an infectious cDNA clone which allows in vitro manipulation of the virus and methods to then infect citrus plants. We created a series of hybrids between decline-inducing and mild CTV strains, tested them in protoplasts, and are amplifying them to inoculate citrus trees for evaluation and mapping of disease determinants. We also extended this developed technology to begin engineering transient expression vectors based on CTV as tools for genetic improvement of tree crops, in this case citrus. Because of the long periods between genetic transformation and the ultimate assay of mature tree characteristics, there is a great need for an effective system that allows the expression or suppression of target genes in fruiting plants. Virus-based vectors will greatly expedite progress in citrus genetic improvement. We characterized several components of the virus that provides necessary information for designing virus-based vectors. We characterized the requirements of the 3 ’-nontranslated replication promoter and two 3 ’-ORF subgenomic (sg) mRNA controller elements. We discovered a novel type of 5’-terminal sgRNAs and characterized the cis-acting control element that also functions as a strong promoter of a 3 ’-sgRNA. We showed that the p23 gene controls negative-stranded RNA synthesis and expression of 3 ’ genes. We identified which genes are required for infection of plants, which are host range determinants, and which are not needed for plant infection. We continued the characterization of native dRNA populations and showed the presence of five different classes including class III dRNAs that consists of infectious and self-replicating molecules and class V dRNAs that contain all of the 3 ’ ORFs, along with class IV dRNAs that retain non-contiguous internal sequences. We have constructed and tested in protoplasts a series of expression vectors that will be described in this proposal.

The article considers online tools for creating tests, which should be used when teaching mathematics in both higher education and general secondary education. Among the variety of online means of creating tests by the method of expert evaluation, three were identified, which allow conducting various tests both in the classroom and remotely, which are free and do not require special conditions for their use and which work on smartphones. The advantages and disadvantages of three online tools for creating tests Kahoot!, Quizizz, Classtime are analyzed, and a comparative description of the selected tools is given. Criteria for the selection of such tools were identified – functional-didactic and organizational. The following indicators belong to the functional-didactic: the presence of different types of questions, including open-ended; use of formulas, both in questions and in answers; use of pictures, both in questions and in answers; no restrictions on the length of questions and answers; instant receipt of results by the teacher, their evaluation and analysis; instant receipt of results by the respondent; to the organizational: the availability of a free version; no need to install the program; ease of use – characterizes the convenience and clarity of the interface for creating tests and their use; possibility of testing in online and offline mode; time limits, both for a single question and the whole test; random order of questions/answer options; instant demonstration of the correct answer to the respondent. With the help of expert evaluation, it was found that according to these criteria, Quizizz is the most appropriate for testing.

Article is devoted to significant problems of creation of system of the indicators for stimulation of balance of supply and demand of products. It is very important for increase of competitiveness of products. The new methodology of calculation of target function of a product and indicators of its efficiency is offered in article. The special place in article is devoted to methodology of definition of an indicator of aggregate useful effect, which includes useful effect of the producer and consumer and promotes balance of their interests. All offered indicators of efficiency of a product are interconnected with each other and only in united system possess the stimulating mechanism of balance of supply and demand. They promote increase of effectiveness of process of planning and allow to find reserves for increase of competitiveness of products.

For programming the AR tools, interactive objects and creating the markers, the method of fiber spaces (k-space) for modeling of ultrasonic wave propagation in an inhomogeneous medium using coarse grids, with maintaining the required accuracy was used. The algorithm and tools of augmented reality were introduced into the adaptive control system of the pulp gas phase in the iron ore flotation process using a control action on the basis of high-energy ultrasound dynamic effects generated by ultrasonic phased arrays. The tools of augmented reality based on k-space methods allow to facilitate wider adoption of ultrasound technology and visualize the ultra-sound propagation in heterogeneous media by providing a specific correspondence between the ultrasound data acquired in real- time and a sufficiently detailed augmented 3D scene. The tools of augmented reality allow seeing the field of ultrasound propagation, its characteristics, as well as the effect of the dynamic effects of ultrasound on the change in the gas phase during the flotation process.

Antimicrobial resistance (AMR) is a complex issue where microorganisms survive antimicrobial treatments, making such infections more difficult to treat. It is a global threat to public health. To increase the evidence base for AMR in the food chain, the FSA has funded several projects to collect data to monitor the trends, prevalence, emergence, spread and decline of AMR bacteria in a range of retail foods in the UK. However, this data and information from the wider literature was yet to be used to create tools to aid in the production of quantitative risk assessment to determine the risk to consumers of AMR in the food chain. To assist with this, there was a need to develop a set of modular templates of risk of AMR within foods. This sought to allow the efficient creation of reproducible risk assessments of AMR to maintain the FSA at the forefront of food safety.

Use of the digital technologies is new and very productive approach for balance of different data. It is very important for balance of supply and demand and for increase of competitiveness of products. Various types of digital models were developed as a result of scientific research, they found reflection in article. Digital models for the description of the list of the sequences of steps and operations of various stages and process in general allow to install system of interrelations between operations and steps and to reach necessary log-ic, increase of effectiveness of any process. Object-relational models for establishment of communications between data of various blocks of databases and functional models of the choice of strategy of data balance form analytical base for justification of the choice of the direction of transformation of data. Models of a combination of a plurality of various data of the offer of products in the form of matrixes of multi-purpose optimization have double effect, because they allow not only to develop various options of data combina-tion, taking into account opportunities of change of location of products over the markets and temporary phases, but also to estimate aggregate useful effect from products. These models together with models of comparison of various options and the choice of optimal solutions allow to generate compatible strategic and current programs of the offer of products as a plurality of the output data balanced with each other and with data of demand. It is providing the best synergetic result. The developed methodology of creation of system of the interconnected digital models for transformation of data and generation of the output data of the situational-strategic program of the offer of products is a cornerstone of formation of new digital econ-omy – of economy of balanced data.

The education system of Ukraine is closely linked with the world education trends, therefore it requires constant renewal and expansion. One of the progressive areas of organizing studying process is creating the studying environment which will allow students to reveal their intellectual potential while searching for the necessary knowledge. That’s why the purpose of the article is analysis of the concept of augmented reality and prospects of its application in the process of training future engineers. The object of study is the system of training future engineers and the subject is using of augmented reality technologies in the process of training future engineers. The research method is analyzing the impact of the augmented reality technologies on the training future engineers. During the research, we have identified positive aspects of the augmented reality technologies in the process of training future engineers. We have defined the stages of creating some methodical system components of teaching fundamental disciplines in the higher technical school through interdisciplinary integration and technologies of augmented reality.

Citizen science and food is part of a new programme of work to explore how we can involve the communities we serve when building the evidence-base on which policy decisions are made. Citizen science is an approach that can provide high volumes of data with a wide geographic spread. It is relatively quick to deploy and allows access to evidence we would ordinarily have difficulty collating. This methodology has been endorsed by the European Commission for Research, Science and Innovation. There is no one size fits all definition, but citizen science projects involves engaging with communities and asking them to be part of the project, either through engaging them in data collection or through other ways of co-creation. For participants, citizen science offers learning opportunities, the satisfaction of contributing to scientific evidence and the potential to influence policy. It can also give us data which is high in volume, has wide geographical spread, is relatively quick to deploy and that we couldn’t access any other way. Projects using these methods often involve engaging with communities and asking them to be part of the project. This can be either through working with them in data collection, or through co-creation. This report demonstrates that the research community are already undertaking numerous pieces of research that align with FSA’s evidence needs. This includes examples from the UK and other global communities. Participants in such research have collected data on topics ranging from food preparation in the home to levels of chemical contaminant in foods. The findings of this report outline that citizen science could allow the FSA to target and facilitate more systematic engagement with UK and global research communities, to help address key research priorities of the FSA.

Dredged materials provide a number of beneficial use opportunities, including beach nourishment, habitat creation and restoration, and other activities. In situ sediment color is important for determining aesthetic and habitat suitability, for beach nourishment, and for other projects. However, dredged materials must meet locally established color compatibility requirements (for example, material cannot be too dark). Often, potential sediment sources are close to meeting specified color thresholds, and previous observations suggest that sediments lighten over time. In response to these observations, this study quantified sediment color change potential in a dredged m aterial management context. Results indicate that dredged material sediment color responded to changes in secondary color components, sediment mixing, and photolytic bleaching improving the sediment color for beneficial use application. Findings allowed for development of a conceptual color change capacity framework and supported development of tools for resource managers to incorporate color change dynamic into planning and operations activities.The following report provides a framework for determining the color change capacity of dredged materials using (1) a comprehensive laboratory approach and (2) a semiquantitative index based on source material and placement location conditions. These tools allow practitioners to incorporate dredged-material color change into resource management decisions, thus increasing beneficial use opportunities.