pH-sensitive Hybrid Hydrogel Materials with Incorporated Nanoparticles

Synthesis and physico-chemical studies of new promising hybrid hydrogels based on polyvinyl alcohol (PVA) acetales and copolymer hydrogels based on vinyl monomers have been studied. Acrylamide, N-Isopropylacrylamide and Acrylic acid were used as components of interpenetrating networks based on PVA acetals. Sponge acetales of polyvinyl alcohol were used as enforcing net. Study of swelling kinetics as compared to solvents of various nature (water in various pH, ethanol, toluene etc) was carried out. IR comparative spectra were obtained for different composites. High anti-bacterial action of the synthesized nanocomposites containing silver towards gram-positive and gram-negative bacteria has been demonstrated

Nano-Sized Hydrogel Composites Based on N-Isopropylacrylamide and Magnetite for Controlled Drug Delivery

Synthesis and characterization studies of promising nano-sized hydrogel composites based on nisopropylacrylamide and magnetite have been studied. N-isopropylacrylamide (NIPA) gel component was used as a carrier of various drugs, magnetite was used as a magneto-responsive component. Presence of magnetite it was proved by EPR method. Composite nanoparticles were characterized by electron microscopy (TEM) and by dynamyc light scattering (DLS) method. It was shown that the average size of nanoparticles is 50 or 100 nm, depending on the method of preparation. The hydrogel is characterized by clear phase transition between swollen and collapsed state upon heating above 32⁰C. Rapid release of the incorporated drug (as a model was used the photosensibilizer -Methylene Blue) observed during thermoresponsive nanocomposite gels heating in the physiologically acceptable range, but still above phase transition temperature (up to 40–50 ⁰C), allows application of the discussed drug delivery systems in medical hyperthermia

Thermo- and pH-sensitive Hydrogels with Incorporated Multi-Walled Carbon Nanotubes

Carbon nanotubes (CNTs) attract great attention due to the unique combination of physical, chemical, electrical and mechanical properties which have high potential for design of nanocomposite materials with customized properties (electromagnetic shielding, high strength and electroconductivity materials), actua-tors (e.g. artificial muscles and tissues), sensors, components of microfluidic devices, etc. Usage of CNT in practical applications is limited by their lower solubility in most solvents. Remaining primary agglomer-ates of NT not only increase the amount of filler needed for percolation, but also act as imperfections under mechanical stress. Therefore, in this investigation, the influence of surfactant type and its concentration, along with sonication treating time on sedimentation behavior of multi-walled carbon nanotubes was in-vestigated. To a greater extent, the influence of monomer composition, surface-active substances, and car-bon nanotubes on gelation and physicochemical properties of thermo- and pH-sensitive hydrogels and hy-drogel nanocomposites based on N-isopropylacrylamide with carbon nanotubes were investigated too. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3559

Nanocomposite Membranes with pH- and Thermo-sensitive Function

Resent researches and development in the field of membrane science are focused on improvement of synthetic membranes’ functionality. Combination of soft polymer pH- and temperature-sensitive hydrogels with rigid ultrafiltration membrane attracts much interest as a new class of smart functional systems. In this research we develop pH- and temperature-sensitive composite membranes using radical copolymerization method and study their properties depending on hydrogel composition, nature of synthetic mem-branes, temperature and pH of external medium. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3533

Thermosensitive Hydrogels and Microgels Based on N-isopropylacrylamide and Acrylamide with Incorporated Magnetite

Hydrogels with magnetic properties (ferrogels) are very promising for medical application, first of all, for the design of targeted delivery systems with controlled release of drugs and for magnetic hyperthermia and could be obtained using different techniques (ex- and in-situ syntheses). The present work is devoted to the study of magnetite (Fe3O4) formation inside the nanoreactors of (co)polymeric gels (hydrogels and mi-crogels) based on the derivatives of acrylic acid: N-isopropylacrylamide, acrylamide, and N,N-methylenbisacrylamide (crosslinking agent). Influence of hydrophilic–lipophilic balance of (co)polymeric templates, temperature, pH and concentration of iron cations on the magnetite formation inside polymeric matrixes were investigated along with the development of ferrogel preparation technique. Physical and chemical properties of obtained ferrogels have been studied with gravimetric analysis, thermogravimetric analysis, X-ray fluorescence spectroscopy, X-ray diffraction, optical and transmission microscopies, IR spec-troscopy, etc. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3544

Hybrid Hydrogel Materials with Incorporated Nanoparticles

Synthesis and physico-chemical studies of new promising hybrid hydrogels based on polyvinyl alcohol (PVA) acetales and copolymer hydrogels based on vynil monomers have been studied. Acrylamide and Acrylnitrile were used as some of components that carry various fillers . Sponge acetales of polyvinyl alco-hol were used as enforcing net. The synthesized composites demonstrated high strength as compared to standard hydrogels- Yung-module varied in the range of 80 to 300 kPa depending on the extent of PVA ac-etale matrix filling with hydrogel component. The materials showed high sorbability to water and water solutions. Study of swelling kinetics as compared to solvents of various nature (water, ethanol, sunflower oil ) was carried out. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3546

Dopravní terminál nádraží Krč

DIPLOMOVÝ PROJEKT POJEDNÁVÁ NÁVRH DOPRAVNÍ STAVBY A KONKRETNĚ NÁDRAŽNÍHO TERMINÁLU PRAHA-KRČ. JEHO ORGANICKÉ ZAPOJENÍ DO LOKALITY PLNÉ ZELENĚ A VODNÍCH PRVKŮ. NÁDRAŽÍ JE PROPOJENO S VELKÝM PARKOVACÍM DOMEM SPOJOVACÍ BUDOVOU. HMOTOVÉ ŘEŠENÍ NÁDRAŽÍ VYCHÁZÍ Z PŘIROZENÉHO, ORGANICKÉHO TVARU, PODPORUJE TÍM CELÉ ÚZEMÍ PARKU. OBÁLKA BUDOVY TERMINÁLU JE TVOŘENA PROSKLENOU FASÁDOU, KTERÁ JE DOPLNĚNA SVISLÝMI DŘEVĚNÝMI LAMELAMI, KTERÉ ZÁROVEŇ SLOUŽÍ JAKO STÍNÍCÍ PRVKY. DÉLKA LAMEL ODPOVÍDÁ VÝŠCE PODLAŽÍ. DŮLEŽITÝM PRVKEM STAVBY JSOU DVA KULATÉ SVĚTLÍKY, KTERÉ NABÍDNOU PROSVĚTLENÍ ATRIA PŘIROZENÝM SVĚTLEM. TOTO ŘEŠENÍ VYTVÁŘÍ ZAJÍMAVÉ USPOŘÁDÁNÍ INTERIÉRU A DODÁVÁ ATRAKTIVITU CELÉMU OBJEKTU. INTERIÉR JE NAVRŽEN Z OHLEDEM NA CELÉ ÚZEMÍ PARKU, DISPOZIČNĚ VYCHÁZÍ Z ORGANICKÉHO TVARU. VĚTŠINA SVISLÝCH KONSTRUKCÍ JSOU PROSKLENA DALŠÍ MATERIÁLY JSOU DŘEVO A KÁMEN. INTERIÉR JE PLNÝ ZELENĚ, MNOHOTVÁRNÝM DŘEVĚNÝM NÁBYTKEM, KTERÝ PŘIPOMÍNÁ OBRYSY BUDOV V PARKU. HLAVNÍ DOMINANTOU INTERIÉRU JE VZROSTLÝ STROM, KTERÝ PROCHÁZÍ SKRZ VŠECHNA PATRA,TÍM VIZUÁLNĚ PROPOJUJE EXTERIÉR S INTERIÉREM. NÁVRH OBJEKTU VYCHÁZÍ Z KONCEPČNÍ URBANISTICKÉ STUDIE ZPRACOVANÉ V PRŮBĚHU PŘEDDIPLOMOVÉHO PROJEKTU CÍLEM KTERÉHO JE REVITALIZACE KRČSKÉHO ÚDOLÍ V PRAZE 4. ZÁMĚREM PŘEDDIPLOMOVÉ PRÁCE JE VYTVOŘENI ZE ZANEDBANÉHO PARKU OHRANIČENÉHO Z JIHU ŽELEZNICÍ A ZE SEVERU FREKVENTOVANOU JIŽNÍ SPOJKOU, ATRAKTIVNÍ MÍSTO-LOKALITU PRO SETKÁVANÍ LIDI A VHODNÉ MÍSTO PRO ODPOČINEK.THE THESIS PRESENTS A TRANSPORTATION BUILDING CONSTRUCTION PROJECT, TO BE PRECISE, RAILWAY STATION TERMINAL PRAGUE- KRČ, ITS ORGANIC INTEGRATION INTO THE ENVIRONMENT THROUGH GREEN AREAS AND WATER ELEMENTS. THE RAILWAY STATION OBJECT IS ADJUSTED TO A PARKING HOUSE BY A CONNECTING BUILDING. THE GEOMETRIC SOLUTION OF THE TRAIN STATION IS BASED ON NATURAL, ORGANIC SHAPES COMPLEMENTING THE WHOLE PARK AREA. THE OUTSIDE OF THE TERMINAL BUILDING IS MADE OF A GLASS FACADE COMPLEMENTED BY PENDING WOODEN PLATES THAT SERVE TO MAKE SHADE. THE LENGTH OF THE PLATES MATCHES THE FLOOR HEIGHT. THE ESSENTIAL ELEMENT OF THE CONSTRUCTION IS TWO ROUND LIGHT FIXTURES THAT OFFER THE ATRIUM SOME NATURAL LIGHT. THIS SOLUTION CREATES AN EXTRAORDINARY ORGANISATION OF THE INTERIOR AND ADDS ATTRACTION TO THE OBJECT. THE INTERIOR IS DESIGNED IN ACCORDANCE WITH THE WHOLE PARK AREA. THE LAYOUT IS BASED ON ORGANIC SHAPES. MOST OF THE PENDING CONSTRUCTIONS ARE MADE OF GLASS. OTHER MATERIALS USED IN THEM ARE WOOD AND STONE. THE INTERIOR IS FURNITURED WITH GREEN, MULTI-SHAPED WOODEN PIECES THAT RESEMBLE THE BUILDING CONTOURS IN THE PARK. THE MAIN DOMINANT OF THE INTERIOR IS A GROWN-IN TREE COMING THROUGH ALL THE FLOORS AND LINKING THE EXTERIOR AND THE INTERIOR. THE DESIGN OF THE OBJECT COMES FROM A CONCEPTUAL URBAN STUDY USED DURING THE FINAL PROJECT WORK THE AIM OF WHICH WAS TO REVITALIZE THE KRČ VALLEY IN PRAGUE 4. THE OBJECTIVE OF THE FINAL WORK IS TO CREATE OUT OF A NEGLECTED PARK BORDERED BY RAILWAYS IN THE SOUTH AND A BUSY SOUTHERN JUNCTION IN THE NORTH AN ATTRACTIVE LOCATION FOR PEOPLE TO MEET AND HAVE A REST

Философия Нового Времени: новое содержание в но- вой форме

Данный ритмизованный текст применяется с целью облегчить студентам усвоение учебного курса. В то же время, в нём отражаются моменты научной новизны, отражающие исследования автора и опыт его работы в сфере истории философии

Bestimmung der Messunsicherheiten bei der Temperaturmessung mit Oberflächen-Tasttemperaturfühlern

Zusammenfassung: In der vorliegenden Arbeit wurden die Einflussfaktoren in gesamter Messkette der Oberflächentemperaturmessung mit Tasttemperaturfühlern untersucht. Für drei Fühler verschiedener Bauformen und Sensortypen (Pt100, NTC und Typ K) und zwei Prüfkörper (Stahl und Aluminium) wurden entspreche Messunsicherheitsbudgets erstellt. Die Einflussfaktoren teilen sich abhängig von dem Ort und der Ursache des Entstehens nach: 1. Thermische Messfehler; 2. Messfehler des Sensors selbst; 3. Messfehler der verwendeten Messgeräte. Besondere Aufmerksamkeit wurde den Untersuchungen von thermischen Messfehlern gewidmet. Die Benutzung der Kalibriereinrichtung verhilft die wesentlichsten Faktoren, wie Wärmeableitung über den Fühler, Anpresskraft, Anpresswinkel, Wärmeleitfähigkeit des Messobjektes zu schätzen. Mit Hilfe der Prüfkörper aus unterschiedlichen Materialien wurde eine Verkleinerung des thermischen Messfehlers sowie seiner Teilfehler mit steigender Wärmeleitfähigkeit auf der Praxis bewiesen. Es wurde auch bemerkt, dass die zusätzliche Anpresskraft nur bei der Messung mit den Fühlern mit der unfedernden glatten Kontaktfläche nützlich sein kann. Die Reproduzierbarkeit der Handmessungen im Vergleich zu den Messungen mit Anpressvorrichtung ist für die Kalibrierung zu schlecht, obwohl bei den Handmessungen durch eine gezielte Verschiebung und Kippung der passende Anpresswinkel bzw. Anpresskraft erreicht werden kann. In diesem Fall wird durch die Verminderung des thermischen Widerstands mit einem kleineren Fehler gemessen. Aber Messungen mit Hilfe der Prüfeinrichtung bzw. Anpressvorrichtung ist es möglich den thermischen Fehler durch reproduzierbare herauszufinden und rechnerisch zu korrigieren. In den Messunsicherheitsbudgets für den Fühler ist allerdings die Unsicherheit der Wiederholungsmessungen dominierend. Das ist durch eine Reproduzierbarkeit des Aufsetzwinkels nach der Aus- und Einspannen des Fühlers bedingt. Der Großteil dieser Masterarbeit bestand darin jeder Einflussfaktor zu untersuchen. Dazu wurden jeweils zwei Messungen verglichen, einmal mit und einmal ohne jeweiligen Einflussfaktor (bei unveränderten anderen Einflussfaktoren). Durch weitere Untersuchungen zur Reproduzierung der gleichen Position bzw. Winkels des Fühlers sowie Kalibrierung des Prüfkörpers mit eingebauten Mantelthermoelementen könnten neue Möglichkeiten zur genaueren Bestimmung der Einflussfaktoren auf den thermischen Messfehler für beliebigen Oberflächen-Tasttemperaturfühlern gefunden werden.Abstract: In the present study were investigated the influence factors in the complete surface temperature measurement chain of surface contact thermometers. For three thermometer of various designs and types of sensitive element (Pt100, NTC and K) and two specimens (steel and aluminum) were corresponded to uncertainty budgets created. The bulk of this work was to examine and to estimate each influence factor. The factors are organized depending on the location and the cause for the emergence into: thermal measurement error, measurement error of sensor, measurement error of the measuring instruments used. Particular attention was devoted to the investigations of thermal measurement error. The use of calibration plant helps to estimate the most important factors such as heat dissipation on the sensor, contact force and angle, thermal conductivity of the target. Using test specimens of different materials a reduction of thermal measurement error with increasing thermal conductivity has been demonstrated in practice. It is possible to determine the thermal errors by reproducible measurements using the calibration plant with pressing apparatus. However in the uncertainty budget for the thermometer the uncertainty of repeated measurements is dominant. This is due to the reproducibility of the pressing angle after clamping the sensor.Ilmenau, Techn. Univ., Masterarbeit, 201

Постнеклассическая наука и здравый смысл

Благодаря синергетике, а также – новым достижениям в квантовой физике и космологии, современное естествознание сближается со здравым смыслом. Парадоксы сферы становления, приводившие физиков XX в. на путь субъекти-визма, разрешаются на базе синергетики и диалектики. В том числе, здравое объяснение получают нелокальные эффекты в различных областях (квантовая запутанность, быстрый свет, всемирное тяготение), неизменность скорости света в вакууме, происхождение Вселенной и многое другое