Materials Literature
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With the Antarctic Treaty implemented in 1959 human impact to Antarctica is partly regulated. Antarctica is our Earth last almost pristine continent. In the first years the main focus was laying on the fields of science and freedom, but environmental protection aspects came to an equal level of interest over time. Not…
Laser-sintered Si, Ge and SiGe nanoparticle thin films are investigated concerning their applicability to thermoelectrics. A mesoporous meander-like structure is the characteristic feature of the resulting films. To adjust the doping in the films a new wet-chemical method is developed. The complex structure of the fil…
In the present investigation, the series of aluminium and cobalt substituted lithium hexaferrites with chemical compositional formula Li0.5Fe0.5+xAl12-2X CoX O19 (where x=2,3,4,5 and 6) was synthesized using perfect stoichiometric mixtures of oxide by standard ceramic solid state reaction method at 12000C for 120 hrs.…
A systematic study on the absorption enhancement by embedding the periodic metallic nanostructures (NSs) inside the organic Copper Phthalocyanine (CuPc) thin films, is reported. The Surface Plasmon resonance (SPR) can be excited by adding metallic nanostructures and the light can be concentrated and folded into the Cu…
Since the discovery of carbon nanotubes (CNTs), tremendous progress has been made during the past couple of decades on optimizing synthesis and understanding their unique properties. The synthesis of CNTs remains a key in the field of CNT science and technology, and plays a crucial role for their wide range of applica…
The initial research describes a new type of fiber boards for the furniture interior design, developed in cooperation with ATB (Leibniz-Institute for Agricultural Engineering) by using a new method of raw materials preparation and specific production technologies of ATB. The main raw materials are aerobically aged hem…
We report on the preparation and characterization of self-assembled monolayers from aliphatic thiols with different chain length and termination on InAs (100) planar surfaces. This included as first step the development and investigation of a thorough chemical InAs surface preparation step using a dedicated bromine/NH…
Caused by lightning damage to the external elements of construction of the aircraft, in the form of deformities, burn-through and erosive craters and also hidden defects in the affected area can cause a reduction in the strength of damaged parts. Fatigue tests of samples of rod construction elements damaged by lightni…
The growing use of carbon nanotubes (CNTs) in industrial and consumer products raises important questions about their environmental fate and impact on prokaryotes. In the environment, CNTs are exposed to a variety of conditions (e.g. UV light) that could lead to decomposition and changes in their chemical properties.…
This paper is mainly theoretical surveying the use and the reported effect of DU on human body. The DU has been used in the Gulf War of 1991, during the bombings of NATO / UN over the Serbian Republic of Bosnia in September 1995, against Yugoslavia in spring 1999; during the attack on Afghanistan and then further in I…
The electrochemical behavior of copper ions at natural phosphate modified carbon paste electrode (NP-CPE) is reported. The electrode paste was prepared as a mixture of finely powdered natural phosphate (NP) together with graphite powder. The influence of variables such as the accumulation time, pH solution, scan rate…
У роботі досліджено кінетику релаксації фотопровідностів в монокристалі AgGaGeS4 Установлено, що час\nрелаксації фотопровідності в кристалах AgGaGeS4 залежить від інтенсивності освітлення та температури.\nОцінено глибину залягання пастки. ; Kinetics of\nphotoconductivity relaxation in AgGaGeS4 crystal has been investi…
O ciclo térmico é de suma importância para a compreensão das transformações microestruturais, distorções e propriedades mecânicas resultantes das juntas soldadas. Este trabalho aborda a análise da condução do calor em chapas finas de aço baixo carbono com diferentes configurações de juntas soldadas. O procedimento exp…
Nonwovens are materials that are permeable and are manufactured using methods different from the traditional methods of fabric manufacture. Nonwovens are characterised by high porosityand randomly laid fibres. They are also of low strength and there is need to impart strength to the fabrics by needle punching, thermal…
Thesis: S.B., Massachusetts Institute of Technology, Department of Mechanical Engineering, June 2016.
Im Rahmen dieser Arbeit wurden Polydimethylsiloxan-block-Polyacrylnitril (PDMS-b-PAN) Copolymere hergestellt und charakterisiert. Da diese Blockcopolymere als Blendmaterial bei der Kohlenstofffaserherstellung auf Basis von PAN Verwendung finden sollen, stand deren thermisches Verhalten im Vordergrund. Es konnte gezeig…
El presente trabajo estudia la influencia de la capa superficial cementada en un acero AISI/SAE 1045 con el fin de mejorar las propiedades mecanicas y tribologicas, debido a que con los tratamientos termicos tradicionales no se alcanza una alta dureza superficial, lo que conlleva a cortar la vida util del material. Es…
Environmental awareness and depletion of wood resources worldwide has directed researchers to alternative fibre recourses. The use of agricultural by-products such as rice husk (RH), rice straw, wheat straw and cotton stalks, etc., which are produced in billions of tonnes annually around the world, can provide an alte…
The aim of this thesis is to contribute to the fundamental understanding of the hydrogen evolution and the hydrogen oxidation reaction at platinum nanostructures on gold surfaces. This goal was pursued by investigating different systems, such as platinum nanoparticles on extended gold surfaces and on defined gold-nano…
Forskolin is a highly substituted labdane diterpenoid isolated from the roots of Indian plant Coleus forskohlii, which has diverse biological effects, including the ability to activate adenylyl cyclase. Forskolin and its derivatives are therefore a unique tool for studying the biochemistry and the regulation of adenyl…