|
Fibre reinforced mixtures for restoration and safeguaerding of monuments
Drdácký, Miloš ; Michoinová, D. ; Procházka, P.
Scientific recommendations for receipt and technology procedures of preparation of mixtures with required remedy characteristics, namely with a higher resistance against occurrence of macro cracks and propagation of micro cracks. Based on mathematical modelling of composite materials with inorganic (brittle) matrix and natural as well as man made polymeric fibres, an optimum cross section shape of the fibre has been determined. Characteristics of samples made from resulting mixtures have been experimentally tested from the point of view of mechanical behaviour including fracture characteristics and long term stability at cyclic changes of environment and climatic loading. The natural fibrous materials involved horse and goat hair, saw dust and husk, the man made polypropylene fibres.
|
|
Time-resolved fluorescence in investigation of colloid system
Černá, Ladislava ; Ouzzane, Imad (referee) ; Mravec, Filip (advisor)
This thesis is focused on determination of the basic spectral characteristics, such as fluorescence maximum and lifetime, of fluorescent probes prodan [6-propionyl-2-(dimethylamino)naphthalene] and perylene by steady-state and time-resolved fluorescence spectroscopy. Time-resolved measurements were realized through TCSPC method (time-correlated single photon counting). The characteristics of prodan were found in water, acetone, n-heptane and in mixtures of these, so that a polar scale of environments would arise. Both of the mentioned probes were further investigated in systems of aqueous solutions of hyaluronic acid (300 kDa) at the concentration of 10 mg•l-1 together with cationic surfactant CTAB (cetyltrimethylammonium bromide) at the concentration range from 0.01 to 0.20 mmol•l-1 (before CMC). The aim was to confirm the reach and the range of critical aggregation concentration of the surfactant (CAC), to uncover the basic spectral characteristics of the mentioned probes in this concentration range and to verify the stability of this system in the presence of NaCl at the concentration of 0.15 mol•l-1. Furthermore, by TCSPC method were obtained time-resolved emission spectra of prodan from the system of hyaluronic acid and CTAB at one concentration of CTAB in CAC interval both without salt and with salt at the concentration of 0.15 mol•l-1. The obtained time-resolved emission spectra correlated with the results of the CAC concentration range measurement. After addition of salt the system of CAC proved to be unstable.
|
|
Periradicular therapy in the Hospital Český Krumlov a.s.
KUTIŠOVÁ, Magdalena
This bachelor thesis focuses on the issue of backache and its treatment. Backache is one of the most common diagnosis. The most affected are usually people in their productive age and therefore the economic and social consequences are very significant. There are many techniques used in diagnosis of backache, easier and cheaper techniques are used in the first place. The diagnosis consists of examination of the patient, medical history and clinical examination. The treatment depends on type and progress of the illness. The basic division is acute (4 to 6 weeks) and chronic case (more than 3 months). Another division is common backache, nervous radicular pain and serious illness of spine. I will mainly focus on nervous radicular pain. The basis of the therapy should be active treatment accompanied by physiotherapy. In addition to this therapy, pharmacological treatment is also used. The pharmacological treatment consists of application of nonsteroidal anti-inflammatory drugs, analgesic and also antidepressants. If the conservative therapy is not effective, it is possible to use the least invasive techniques. The most popular one is the periradicular therapy under CT guidance, which is also the subject of this thesis. During the periradicular therapy under CT guidance the needle is being inserted to intervertebral foramen in the area of radicular affected nerve where lytic mixture is then being applied. The lytic mixture is sometimes replaced by ozone with the same effect. When the PRT was first used, it was mainly applied in the area of lumbar spine. Nowadays, it is usually used in treatment of lesion in the area of cervical spine. The objective of this thesis is to describe anatomy of the examined area, physiological and pathological state, the main indications for the periradicular therapy and methods of implementation including the used tools and pharmaceutical. Following part is focused on development of application of this method in the Hospital of Český Krumlov, a.s. the radiodiagnostics department, and to analyse the effectiveness of the treatment. I have conducted analysis and processed data of performed periradicular therapies in the Hospital of Český Krumlov, a.s. from 2010, when the method was introduced, up to 2015. I have made a questionnaire survey of 40 people selected by chance and then I processed the data in order to create a general overview of obtained results. The result of the thesis is that the number of performed periradicular therapies is steadily increasing. One-third increase was recorded from 2010 to 2015. The number of women patients prevails, 53% of patients in the given period were women. The most common age category is 50 to 59 years, this category constitutes 37% of all patients. It was found out that most of the patients were treated just for one or two times. Only 7% of the patients were treated for more than two times. When processing the data from my survey, I have found out that most of the patients are satisfied with the effectiveness of the therapy, which corresponds with the results quoted in the bibliography.
|
|
Evaluation of ecotoxicity of selected chemicals with using algal test.
Kosárová, Hedvika ; Pavlovský, Jiří (referee) ; Doležalová Weissmannová, Helena (advisor)
This bachelor thesis deals with the ecotoxicity of 2 - [(2,6-dichlorophenyl)aniline] benzene acetic acid (diclofenac), ?-methyl-4-(2-methylpropyl) benzene acetic acid (ibuprofen) and mixture of cadmium and diclofenac and studies the above using algal toxicity test in accordance with ISO 8692. The theoretical part describes the issue of pharmaceuticals in the environment, and characteristics of standards algae tests and alternative tests. Freshwater green algae Desmodesmus subspicatus were used as testing organisms in all the implemented algal toxicity tests. By the means of these tests, the IrC50 values for the standard substance potassium dichromate, the drugs diclofenac and ibuprofen and cadmium were determined. The toxicity of cadmium in mixture with diclofenac was also evaluated.
|
| |
|
Properties of aprotic electrolytes for lithium-ion accumulators
Staněk, Vladimír ; Máca, Josef (referee) ; Frk, Martin (advisor)
The present work deals with the properties of suitable electrolytes for lithium-ion batteries. The first part described in the current issue of electrolytes for lithium-ion batteries, types of solvents and their properties and methods of measurement properties. The second part is devoted to the measurement of the properties of solvents and electrolytes such as relative permittivity, density and viscosity. Measurement of relative permittivity was focused on the measurement of the solvent mixture with varying the percentage of the solvent. Viscosity and density were measured on a solvent with a lithium salt added (final electrolyte).
|
| |
|
Vplyv receptúry na farebnosť a kvalitu cestovín
Kubečková, Hana
Goal of this thesis was to formulate and create pasta from spelt products with diferent recipies. 14 recipies of pasta were created, 7 for each of color-flavouring agent. There were made from spelt bran, soft spelt white flour, spelt wholegrain flour, color-flavouring agent eithet spinach powder or red beet powder, salt and water. Color-flavouring agent spinach was labeled as "A", red beet powder as "B". In recipies 1A/B -- 4A/B, the main variable part of the recipe was wheat bran, flour was added as residual to the 500 g of whole mixture. 3% of spinach/red beet powder was used constantly. In recipies 5A/B -- 7A/B the wholegrain spelt flour was used as constant part, variable part was addition of spinach/red beet powder with aim to study the changing properties of pasta with increasing percentge of color-flavouring agent. As methods to evaulate the quality of pasta were selected measuring of color by spectrometer, measuring of frigidity and sensory analysis. The best recipe seemed to be the one from wholegrain flour with addition of 3% of color-flavourinf agent.
|
|
Water soluble foundry binder with heat hardening
Prokop, Tomáš ; Burianová, Klára (referee) ; Cupák, Petr (advisor)
Foundry production produces the biggest amount of dangerous waste, which has a negative impact on environment and working conditions in the foundry. The foundry engineers test new technologies of shaping mixtures with new binders to protect environment and working conditions. We can reduce the production of dangerous waste by using better technologies and less harmful materials, which are needed for modeling forms and cores. The large source of pollution are binders, hardeners and catalyzer needed for binding sand. This work is focused on new types of ecological binders, which are dissolvable in water and are formed by setting temperature. These binders are ecological variants of known inorganic and organic binders.
|
| |
guest ::
