bluuebunny/crossref_metadata_2025 huggingface dataset:
Design of AC-DC Grid Connected Converter using Multi-Objective Optimization
Authors: Piasecki Szymon , Szmurlo Robert , Jasinski Marek
Published: May 2014

Power electronic circuits, in particular AC-DC converters are complex systems, many different parameters and objectives have to be taken into account during the design process. Implementation of Multi-Objective Optimization (MOO) seems to be attractive idea, which used as designer supporting tool gives possibility for better analysis of the designed system. This paper presents a short introduction to the MOO applied in the field of power electronics. Short introduction to the subject is given in section I. Then, optimization process and its elements are briefly described in section II. Design procedure with proposed optimization parameters and performance indices for AC-DC Grid Connected Converter (GCC) interfacing distributed systems is introduced in section III. Some preliminary optimization results, achieved on the basis of analytical and simulation study, are shown at each stage of designing process. Described optimization parameters and performance indices are part of developed global optimization method dedicated for ACDC GCC introduced in section IV. Described optimization method is under development and only short introduction and basic assumptions are presented. In section V laboratory prototype of high efficient and compact 14 kVA AC-DC converter is introduced. The converter is elaborated based on performed designing and optimization procedure with the use of silicon carbide (SiC) power semiconductors. Finally, the paper is summarized and concluded in section VI. In presented work theoretical research are conducted in parallel with laboratory prototyping e.g. all theoretical ideas are verified in laboratory using modern DSP microcontrollers and prototypes of the ACDC GCC.
Sliding-Mode Observer for Speed and Position Sensorless Control of Linear-PMSM
Authors: Kazraji Saeed Masoumi , Soflayi Ramin Bavili , Sharifian Mohammad Bagher Bannae
Published: May 2014

The paper presents a sliding-mode observer that utilizes sigmoid function for speed and position sensorless control of permanent-magnet linear synchronous motor (PMLSM). In conventional sliding mode observer method there are the chattering phenomenon and the phase lag. Thus, in order to avoid the usage of the low pass filter and the phase compensator based on back EMF, in this paper a sliding mode observer with sigmoid function for detecting the back EMF in a PMLSM is designed to estimate the speed and the position of the rotor. Most of conventional sliding mode observers use sign or saturation functions which need low pass filter in order to detect back electromotive force (back EMF). In this paper a sigmoid function is used instead of discontinuous sign function to decrease undesirable chattering phenomenon. By reducing the chattering, detecting of the back EMF can be made directly from switching signal without any low pass filter. Thus the delay time in the proposed observer is eliminated because of the low pass filter. Furthermore, there is no need to compensate phase fault in position and speed estimating of linear-PMSM. Advantages of the proposed observer have been shown by simulation with MATLAB software.
Call Duration Characteristics based on Customers Location
Authors: Žvinys Karolis , Guršnys Darius
Published: May 2014

Nowadays a lot of different researches are performed based on call duration distributions (CDD) analysis. However, the majority of studies are linked with social relationships between the people. Therefore the scarcity of information, how the call duration is associated with a user's location, is appreciable. The goal of this paper is to reveal the ties between user's voice call duration and the location of call. For this reason we analyzed more than 5 million calls from real mobile network, which were made over the base stations located in rural areas, roads, small towns, business and entertainment centers, residential districts. According to these site types CDD’s and characteristic features for call durations are given and discussed. Submitted analysis presents the users habits and behavior as a group (not an individual). The research showed that CDD’s of customers being them in different locations are not equal. It has been found that users at entertainment, business centers are tend to talk much shortly, than people being at home. Even more CDD can be distorted strongly, when machinery calls are evaluated. Hence to apply a common CDD for a whole network it is not recommended. The study also deals with specific parameters of call duration for distinguished user groups, the influence of network technology for call duration is considered.
In vitro antibacterial activity of several plant extracts and essential oils against Brucella melitensis
Authors: Safi Mazen , Al-Mariri Ayman
Published: May 2014

Medicinal plants are considered to be new resources for the production of agents that could act as alternatives to antibiotics in the treatment of antibiotic-resistant bacteria. The aim of this study was to evaluate the efficacy of some plants native to Syria in the treatment of brucellosis. In vitro activities of some essential oils and plant extracts of some medicinal plants against 89 Brucella melitensis isolates was determined by disc diffusion method at a concentration of 5%. The microdilution assay in the fluid medium was used to determine the MICs of essential oils and plant extracts. Among the evaluated herbs, only Thymus syriacus and Cinnamomum zeylanicum essential oils and Laurus nobilis plant extract showed a high activity against B. melitensis strains. Thus, minimal inhibitory concentration (MIC50) values for T. syriacus, C. zeylanicum, and L. nobilis against B. melitensis were 6.25, 3.125 and 6.25 μl/ml, respectively. Among studied essential oils and plant extracts, T. syriacus and C. zeylanicum essential oils, and L. nobilis plant extract were the most effective ones. Moreover, T. syriacus - C. zeylanicum combination was more effective than use of each of them alone. Then, T. syriacus and C. zeylanicum essential oils and L. nobilis plant extract could act as bactericidal agents against B. melitensis.
Plants as potential active components in treatment of androgenetic alopecia
Authors: Dawid-Pać Renata , Urbańska Maria , Dębosz Ilona , Nowak Gerard
Published: May 2014

Androgenetic alopecia is caused by the influence of sex hormones on hair follicles and by hereditary factors. Characteristic for that type of alopecia is shortening of the hair growth phase and elongation of the rest phase caused by disturbance of the process of transformation of testosterone into dihydrotestosterone. Treatment of that type of alopecia involves 5α-reductase inhibitors, antagonists of the androgenic receptor or stimulating proliferation of cells to induce the hair growth. A number of plant raw materials work that way, thus they can be used in treatment of this type of alopecia.
Hmga2 Expression in Renal Carcinoma and its Clinical Significance / Ekspresija Hmga2 U Karcinomu Bubrega I Njen Klinički Značaj
Authors: Liu Ying , Fu Qi-Zhong , Pu Lin , Meng Qing-Guo , Liu Xian-Feng , Dong Sheng-Fang , Yang Jian-Xun , Lv Guang-Yao
Published: May 2014

Background: The objective of this study is to detect HMGA2 expression in renal carcinoma to explore its relationship with clinicopathology and its significance in prognosis. Expressions of HMGA2 mRNA and protein were detected in 50 renal carcinoma specimens, 50 corresponding adjacent normal kidney tissue samples and 40 renal benign tumour specimens via reverse transcription polymerase chain reaction and immunohistochemical assay.

Methods: Expression analysis was performed along with clinical data analysis. The relative expression levels of HMGA2 mRNA in renal carcinoma, renal benign tumour tissues and adjacent normal renal tissues were 0.84±0.23, 0.19±0.06 and 0.08±0.04, respectively. HMGA2 protein positive rates were 68.0%, 7.5% and 2.0%, with a significant difference (P<0.05). HMGA2 expression was not significantly correlated with gender, age, tumour size and histological type (P>0.05), but was significantly correlated with TNM stages and lymph node metastasis (P<0.05).

Conclusions: The expressions of HMGA2 gene and protein in renal carcinoma were closely correlated with tumour formation, progression and metastasis. HMGA2 may become a powerful new pathological marker and prognostic factor for renal carcinoma.
»Treatment Resistance« Enigma Resolved by Pharmacogenomics − A Case Study of Clozapine Therapy in Schizophrenia / Enigma »Terapo-Rezistence« Razrešena Uz Pomoć Farmakogenomike - Prikaz Slućaja Terapije Klozapinom U Shizofreniji
Authors: Marić Nadja P. , Nikolić Slobodanka Pejović , Buzadžić Ivana , Jovičić Milica , Andrić Sanja , Mihaljević Marina , Pavlović Zorana
Published: May 2014

The introduction of antipsychotic medication in the 1950s forever changed the outlook on the treatment of schizophrenia, although there is still a large proportion of patients who do not reach functional recovery. At least 30% of patients do not respond to clozapine, the tricyclic dibenzodiazepine with complex pharmacological actions, which was proven to be more effective than any other antipsychotic in the treatment of schizophrenia. According to most of the therapeutic guidelines for schizophrenia, clozapine is the third line therapy for patients who did not respond to other antipsychotics. Large inter-individual variability exists for clozapine bioavailability and plasma steadystate concentrations and clearance. Clozapine is metabolized by the cytochrome P450 oxidase enzyme family (CYP450). Cytochrome P450 1A2 (CYP1A2), which is polymorphically expressed in humans, is the main enzyme of clozapine metabolism. This case report addresses the influence of CYP1A2*1F genetic polymorphism on cloza - pine metabolism, explains the primary non-response of a young patient with schizophrenia due to increased gene expression in homozygous genotype *1F/*1F (increased metabolism of clozapine) and underlies the importance of personalizing schizophrenia treatment by means of genetic and other molecular tools, at least in the cases of »treatment resistance«.
Questionable Reliability Of Homocysteine As The Metabolic Marker For Folate And Vitamin B12 Deficiency In Patients With Chronic Obstructive Pulmonary Disease
Authors: Beletić Anđelo , Mirković Duško , Dudvarski-Ilić Aleksandra , Milenković Branislava , Nagorni-Obradović Ljudmila , Đorđević Valentina , Ignjatović Svetlana , Majkić-Singh Nada
Published: May 2014

Background:An increased homocysteine (Hcy) concentration may represent a metabolic marker of folate and vitamin B12deficiency, both significant public health problems. For different reasons, patients with chronic obstructive pulmonary disease (COPD) are prone to these deficiencies. The study evaluates the reliability of Hcy concentration in predicting folate or vitamin B12deficiency in these patients.

Methods:A group of 50 COPD patients (28 males/22 females, age$({\rm{\bar x}} \pm {\rm{SD}} = 49.0 \pm 14.5)$years was enrolled. A chemiluminescent microparticle immunoassay was applied for homocysteine, folate and vitamin B12concentration. Kolmogorov-Smirnov, Mann-Whitney U and χ2tests, Spearman’s correlation and ROC analysis were included in the statistical analysis, with the level of significance set at 0.05.

Results:Average (SD) concentrations of folate and vitamin B12were 4.13 (2.16) μg/L and 463.6 (271.0) ng/L, whereas only vitamin B12correlated with the Hcy level (P=−0.310 (R=0.029)). Gender related differences were not significant and only a borderline significant correlation between age and folate was confirmed (R=0.279 (P=0.047)). The incidence of folate and vitamin B12 deficiency differed significantly (P=0.000 and P<0.000 for folate and vitamin B12respectively), depending on the cut-off used for classification (4.4, 6.6 and 8.0 μg/L – folate; 203 and 473 ng/L – vitamin B12). ROC analyses failed to show any significance of hyperhomocysteinemia as a predictor of folate or vitamin B12deficiency.

Conclusion:Reliability of the Hcy concentration as a biomarker of folate or vitamin B12depletion in COPD patients is not satisfactory, so their deficiency cannot be predicted by the occurrence of HHcy.
Direct Molecular Diagnosis of CYP21A2 Point Mutations in Macedonian and Serbian Patients with 21-Hydroxylase Deficiency/Direktna Molekularna Dijagnoza CYP21A2 Tačkaste Mutacije Kod Makedonskih I Srpskih Pacijenata Sa Nedostatkom 21-Hidroksilaze
Authors: Anastasovska Violeta , Milenković Tatjana , Kocova Mirjana
Published: May 2014

Background: Steroid 21-hydroxylase deficiency is present in 90-95% of all cases with congenital adrenal hyperplasia (CAH), an autosomal recessive disorder. It can present as the severe classical salt wasting (SW) or simple virilising (SV) form, or the milder, nonclassical form. Nine pseudo- gene-derived point mutations account for about 80% of all defects in the CYP21A2 gene coding the 21-hydroxylase enzyme.

Methods: We have studied nine CYP21A2 point mutations in 61 Macedonian and 24 Serbian patients with different clinical presentations of CAH, using the PCR/ACRS method.

Results: Six different mutations were detected in 71.3% of alleles of the Macedonian patients. The most prevalent mutation was IVS2. Mutations were detected in 85.4% of the SW, 83.4% SV and 47.7% LO alleles. In the Macedonian patients the most common genotype was IVS2/IVS2. Five different mutations were detected in 64.6% of alleles of the Serbian patients. The most preva- lent was P30L. Mutations were present in 83.3% SW, 80% SV and 50% of the LO alleles. In the Serbian patients, the P30L/P30L genotype was the most frequent.

Conclusions: Specific CYP21A2 mutations are involved in different clinical forms of CAH. High frequency of P30L was found in both populations. Also, high prevalence of the mild P30L mutation was found in both the Macedonian and Serbian classical SV patients. Our findings support the role of the P30L mutation in pronounced virilisation. An unusual finding is the low frequency of V281L in the Macedonian non-classical patients and its absence in the ones from Serbia.
Evaluation of Generalized Variance Functions in the Analysis of Complex Survey Data
Authors: Cho MoonJung , Eltinge John L. , Gershunskaya Julie , Huff Larry
Published: May 2014

Two sets of diagnostics are presented to evaluate the properties of generalized variance functions (GVFs) for a given sample survey. The first set uses test statistics for the coefficients of multiple regression forms of GVF models. The second set uses smoothed estimators of the mean squared error (MSE) of GVF-based variance estimators. The smooth version of the MSE estimator can provide a useful measure of the performance of a GVF estimator, relative to the variance of a standard design-based variance estimator. Some of the proposed methods are applied to sample data from the Current Employment Statistics survey.
Disclosure Risk from Factor Scores
Authors: Drechsler Jörg , Ronning Gerd , Bleninger Philipp
Published: May 2014

Remote access can be a powerful tool for providing data access for external researchers. Since the microdata never leave the secure environment of the data-providing agency, alterations of the microdata can be kept to a minimum. Nevertheless, remote access is not free from risk. Many statistical analyses that do not seem to provide disclosive information at first sight can be used by sophisticated intruders to reveal sensitive information. For this reason the list of allowed queries is usually restricted in a remote setting. However, it is not always easy to identify problematic queries. We therefore strongly support the argument that has been made by other authors: that all queries should be monitored carefully and that any microlevel information should always be withheld. As an illustrative example, we use factor score analysis, for which the output of interest - the factor loading of the variables - seems to be unproblematic. However, as we show in the article, the individual factor scores that are usually returned as part of the output can be used to reveal sensitive information. Our empirical evaluations based on a German establishment survey emphasize that this risk is far from a purely theoretical problem.
Disclosure-Protected Inference with Linked Microdata Using a Remote Analysis Server
Authors: Chipperfield James O.
Published: May 2014

Large amounts of microdata are collected by data custodians in the form of censuses and administrative records. Often, data custodians will collect different information on the same individual. Many important questions can be answered by linking microdata collected by different data custodians. For this reason, there is very strong demand from analysts, within government, business, and universities, for linked microdata. However, many data custodians are legally obliged to ensure the risk of disclosing information about a person or organisation is acceptably low. Different authors have considered the problem of how to facilitate reliable statistical inference from analysis of linked microdata while ensuring that the risk of disclosure is acceptably low. This article considers the problem from the perspective of an Integrating Authority that, by definition, is trusted to link the microdata and to facilitate analysts’ access to the linked microdata via a remote server, which allows analysts to fit models and view the statistical output without being able to observe the underlying linked microdata. One disclosure risk that must be managed by an Integrating Authority is that one data custodian may use the microdata it supplied to the Integrating Authority and statistical output released from the remote server to disclose information about a person or organisation that was supplied by the other data custodian. This article considers analysis of only binary variables. The utility and disclosure risk of the proposed method are investigated both in a simulation and using a real example. This article shows that some popular protections against disclosure (dropping records, rounding regression coefficients or imposing restrictions on model selection) can be ineffective in the above setting.
An Induction Motor Based Wind Turbine Emulator
Authors: Sokolovs A. , Grigans L. , Kamolins E. , Voitkans J.
Published: May 2014

The authors present a small-scale wind turbine emulator based on the AC drive system and discuss the methods for power coefficient calculation. In the work, the experimental set-up consisting of an AC induction motor, a frequency converter, a synchronous permanent magnet generator, a DC-DC boost converter and DC load was simulated and tested using real-life equipment. The experimentally obtained wind turbine power and torque diagrams using the emulator are in a good agreement with the theoretical ones.
Structural and Thermal Analysis of Automotive Disc Brake Rotor
Authors: Belhocine Ali , Bouchetara Mostefa
Published: May 2014

The main purpose of this study is to analyze the thermomechanical behavior of the dry contact between the brake disc and pads during the braking phase. The simulation strategy is based on softawe ANSYS11. The modeling of transient temperature in the disc brake is actually used to identify the factor of geometric design of the disc to install the ventilation system in vehicles. The thermal-structural analysis is then used with coupling to determine the deformation established and the Von Mises stress in the disc, the contact pressure distribution in pads. The results are satisfactory compared to those of the specialized literature.
Influence of High Pressure and High Temperature Hydrogen on Fracture Toughness of Ni-Containing Steels and Alloys
Authors: Balitskii Alexander , Ivaskevich Ljubomyr , Mochulskyi Volodymyr , Eliasz Jacek , Skolozdra Oleg
Published: May 2014

The effect of hydrogen on short-term strength, low-cycle durability and planestress fracture toughness of 10Cr15Ni27 steel, 04Cr16Ni56 and 05Cr19Ni55 alloys at pressure up to 35 MPa and temperature 293. . . 773 K was investigated. The modes of hydrogen action for which the elongation , reduction of area , low-cycle durability N and crack resistance parameters Kc of alloys are minimal were established: hydrogen pressure above 10 MPa (non-hydrogenated specimens of 04Cr16Ni56 alloy) and above 15 MPa (hydrogenated specimens of 10Cr15Ni27 steel and 05Cr19Ni55 alloy, hydrogen concentration 15 and 19 wppm, respectively).
Robin Heart Surgery Robotic System. Challenges in Mechanical Construction, Control System and Stuff Training Before First Clinical Application
Authors: Nawrat Zbigniew , Kostka Paweł
Published: May 2014

The last decades, when robots have appeared in the operating room, showed the possibility of surgery enhancement by improving precision, repeatability, stability and dexterity. However, taking into consideration still existing limitations of robotics in surgery, and treating the robots as medical devices with the highest degree of safety level requirements, one must take a number of complex actions when preparing the experimental clinical application of a new modern robot Robin Heart. Presented paper describes the current state of procedures carried out in the Robin Heart project of surgery robots prepared for clinical application. Based on experiences with the devices existing on the market and, first of all, thanks to knowledge and expertise gained by our team during last 12 years, intensive work are currently done in order to introduce both mechanical and electronic modifications as well as to improve the safety system. As far as human resources are concerned, a professional team able to carry out the robot-supported surgery is prepared based on the created system of technical and functional trainings on simulation stands, which also includes the developed operation planning procedures. The first telemanipulator designed for clinical practice is the Robin Heart Vision - endoscopic system manipulator.
Bounds for sine and cosine via eigenvalue estimation
Authors: Haukkanen Pentti , Mattila Mika , Merikoski Jorma K. , Kovacec Alexander
Published: May 2014

Define n × n tridiagonal matrices T and S as follows: All entries of the main diagonal of T are zero and those of the first super- and subdiagonal are one. The entries of the main diagonal of S are two except the (n, n) entry one, and those of the first super- and subdiagonal are minus one. Then, denoting by λ(·) the largest eigenvalue,

Using certain lower bounds for the largest eigenvalue, we provide lower bounds for these expressions and, further, lower bounds for sin x and cos x on certain intervals. Also upper bounds can be obtained in this way.
On the Relationships between Zero Forcing Numbers and Certain Graph Coverings
Authors: Taklimi Fatemeh Alinaghipour , Fallat Shaun , Meagher Karen
Published: May 2014

The zero forcing number and the positive zero forcing number of a graph are two graph parameters that arise from two types of graph colourings. The zero forcing number is an upper bound on the minimum number of induced paths in the graph that cover all the vertices of the graph, while the positive zero forcing number is an upper bound on the minimum number of induced trees in the graph needed to cover all the vertices in the graph. We show that for a block-cycle graph the zero forcing number equals the path cover number.We also give a purely graph theoretical proof that the positive zero forcing number of any outerplanar graphs equals the tree cover number of the graph. These ideas are then extended to the setting of k-trees, where the relationship between the positive zero forcing number and the tree cover number becomes more complex.
Determinant Representations of Sequences: A Survey
Authors: Moghaddamfar A. R. , Salehy S. Navid , Salehy S. Nima
Published: May 2014

This is a survey of recent results concerning (integer) matrices whose leading principal minors are well-known sequences such as Fibonacci, Lucas, Jacobsthal and Pell (sub)sequences. There are different ways for constructing such matrices. Some of these matrices are constructed by homogeneous or nonhomogeneous recurrence relations, and others are constructed by convolution of two sequences. In this article, we will illustrate the idea of these methods by constructing some integer matrices of this type.
The theory and applications of complex matrix scalings
Authors: Pereira Rajesh , Boneng Joanna
Published: May 2014

We generalize the theory of positive diagonal scalings of real positive definite matrices to complex diagonal scalings of complex positive definite matrices. A matrix A is a diagonal scaling of a positive definite matrix M if there exists an invertible complex diagonal matrix D such that A = D*MD and where every row and every column of A sums to one. We look at some of the key properties of complex diagonal scalings and we conjecture that every n by n positive definite matrix has at most 2n−1 scalings and prove this conjecture for certain special classes of matrices.We also use the theory of complex diagonal matrix scalings to formulate a van der Waerden type question on the permanent function; we show that the solution of this question would have applications to finding certain maximally entangled quantum states.
Surface Integrity at Reaming by Reamer MT3 Head
Authors: Kouřil  , Čep Robert , Janásek Adam , Bobrovský Róbert
Published: May 2014

The article is focused on surface integrity at reaming with high-productive reaming MT3 head made by HAM-FINAL Company. The term surface integrity is the surface condition of a workpiece after being modified by a manufacturing process. A machining process produces a surface characterized by the shape, metallurgy and mechanical properties. These surface aspects clearly indicate that a machined surface is very complex. Obviously, a high-energy input increases the likelihood of metallurgical damage and therefore results in a poor surface integrity which has effect on final product. Taking into account different types of created energy transferred to the tested surface and subsurface layer, the basic factors influencing surface integrity are temperatures, residual stresses, metallurgical transformations and also surface plastic deformation. The aim of experimental part is surface integrity tested on holes by reaming MT3 head during manufacturing process and last aim is find out MT3 head tool-life with their evaluation.
Sleeves’ Cutting Tool-Life Tests for Ceramic Inserts
Authors: Janásek Adam , Čep Robert , Nováček Pavel , Schreier Jiří , Ligocki Vlastimil , Vrba Vladimír
Published: May 2014

The article is focused on the experimental determination of tool-life for ceramic tool. Nowadays, machining with indexable ceramic cutting inserts can reduce manufacturing cost, if the cutting tool and the machine tool are designed to compliment each other. With the development of modern ceramic tool materials, they are more and more widely used in the field of metal cutting since their mechanical properties and cutting performances have been greatly improved in last decades. On the basis of previous tests the tool-wear was measured at constant cutting parameter which is more typical for High Volume Manufacturing Processes. The tested material, cast iron 25P, is used at car’s engine. The main aim of this article was to find out the performance for this material by arithmetic tolerance of Ra profile, the greatest height of Rz profile and the external diameter D and its connection.
Working on Surface Nitrided Material for Ra 0.1 microns
Authors: Trefil Antonín , Sikora Kamil , Vrba Vladimír , Petrů Jana
Published: May 2014

The article is focused on working nitriding surface components "Handling piston". There is a possible solution outlined in comparison with grinding technology and surface treatment with lamellar discs. The following are recommendations for the use of a suitable material with the grinding surface preparation component before nitriding.
Measurement of Deviation of Roundnes
Authors: Otrusinová Lenka , Čepová L. , Petřkovská Lenka
Published: May 2014

For the measurement of roundness deviations are used different measuring methods and measuring Instruments from universal to high-precision measuring Instruments. Recently, optical measurement Instruments have irreplaceable role and get to the forefront due simpler process of measurement, accelerate measuring and large possibility to storage obtained data. Nowadays more and more successful optical measurements above touch measurement, but touch measurement still has an important role in companies. Therefore, in the experiment were measured the deviations of the roundness on devices measuring by touch method, and by the optical devices. The values of these measurements allowed their comparison and stastical evaluation.
Studying of Interaction of Cutting Tool and Work-Piece at High Production Turning
Authors: Košút Mário , Rakoci Jozef , Czán Andrej , Ďurech Lukáš
Published: May 2014

This paper concentrates on wear mechanisms, tool life and surface quality of different tool grades used to machine steel for roll bearings production. Presented tool system is used for roughing ope-ration in order to increase productivity by substi-tuting ordinary used ISO inserts. All experiments were carried out at University of Zilina.
Influence of the Cutting Speed and Feed Rate on Torque, Feed Force, Roughness and Shape of the Chips During Deep Hole Drilling
Authors: Letavay Martin , Laluha M. , Pilc Jozef
Published: May 2014

This article describes methodology and realization of the deep hole drilling test. Goal of this trial is to define influence of the cutting speed and feed rate on torque and feed force. As well as during the test here was a focus on roughness and shape of the chips. A gun drill was used for deep hole drilling and we used etalon material, were here is possible to define cutting forces without any further testing of different steel grades. Also there is a description of CNC program, which was used for above mentioned testing and it can be utilized during other different trials.
Possibilities of Evaluation of the Fibre Orientation in Injection Moulding Parts
Authors: Martinkovič Maroš , Likavčan Lukáš
Published: May 2014

The fibre orientation in short fibre reinforced thermoplastics depends on injection moulding technology parameters. The aim of this paper is to propose possibilities for comparing fibre orientation of the real sample and the result from simulation software. Fibre orientation of selected injection moulding part is simulated. In some selected points second-order tensor of orientation was estimated. Stereological metallography was used for possibility of comparison these results with experimental ones. An experimental result of estimation of degree of fibre orientation is described. The use of stereological metallography allows very simple and effective experimental estimation of short glass fibre orientation, which can be used for experimental verification of numerical simulation model, which can be optimized to obtained coincidence with experiments.
Radwaste Treatment Center
Authors: Pospíšil Petr
Published: May 2014

Radioactive waste is produced during the NPP operation as well as the NPP dismantling and decommissioning phase. Different kinds of waste with different volumes, volume generation rates, properties and compositions have to be handled and treated according to the regulations of the corresponding country.

The various waste streams arising especially during D&D activities require versatile treatment approaches to satisfy regulatory requirements and customer needs. Westinghouse has over 30 years of experience in the design, erection and commissioning of radwaste treatment equipment and facilities with special attention on waste volume reduction and minimization of secondary waste generation applied in projects, concepts and studies around the world. Minimization of the total life cycle cost for waste treatment and disposal is a key item for the application of economically viable solutions based on combined processes and integrated waste treatment systems. The ability of enhanced system design and flexible single process combination to form an optimized waste treatment center is crucial to set up the best process configuration with regard to lowest life cycle cost. Westinghouse’s experience in the field of radwaste treatment as well as the application of proven treatment technologies ensures the ability to form a customized radwaste treatment center, either integrated in an existing facility or as a new, free standing building that provides all relevant transport and handling equipment, interfaces, treatment equipment and temporary storage for waste packages.

Starting with the identification of the waste streams and assessment of various treatment concepts together with the Customers, the best waste treatment concept that covers all relevant waste streams will be assessed and proposed, e.g. by using the Westinghouse Simulation and Optimization software tool.

A typical example for combined waste treatment technologies is the Westinghouse Site Radwaste Treatment Facility in Sanmen (China) as well as concept variations of the SRTF for other reactors (e.g. ABWR, VVER, etc).

The purpose of this paper is to provide an overview on the Westinghouse experience to design and optimize waste treatment facilities for various types of reactors under operation or post operation/D&D condition.
Probabilistic Nonlinear Analysis of Reinforced Concrete Bubbler Tower Structure Failure
Authors: Králik Juraj
Published: May 2014

This paper describes the reliability analysis of concrete bubbler tower structure of nuclear power plant with the reactor WWER 440 under high internal overpressure. There is showed summary of calculation models and calculation methods for the probability analysis of the structural integrity considering degradation effects and high internal overpressure. The uncertainties of the resistance and the calculation model were taking in the account in the RSM method.
Possible Aplications of Alkali-Activated Systems in Construciton Možnosti Aplikace Alkalicky Aktivovaných Systémů Ve Stavebnictví
Authors: Boháčová Jana , Staněk Stanislav , Vavro Martin
Published: May 2014

This paper deals with the possibilities of using alkali-activated systems in construction. This article summarizes the advantages and disadvantages of geopolymer in comparison to Portland cement, summarizes research and practical applications of alkali-activated materials in our country and abroad, and provides an overview of directions where these alternative inorganic binders can be in the future very well applied.
Experimental Measurement of Ground Base Plate / Experimentální Měření Základové Desky Na Podloží
Authors: Čajka Radim , Buchta Vojtěch , Burkovič Kamil , Fojtík Roman
Published: May 2014

Analyses of interaction between the foundation slab and the subsoil has been developed for many years. For the determination of stress in foundation structure is needed to determine the influence of the stiffness respectively pliability of subsoil to structural internal forces, and vice versa, how the stiffness of the foundation structure affects the resulting subsidence. At the Faculty of Civil Engineering testing device was constructed so that the phenomena could be examined and then compared with numerical models.
Statistical Dependence of Input Variables in Doproc Method / Statistická Závislost Vstupních Veličin V Metodě Popv
Authors: Janas Petr , Martin Krejsa
Published: May 2014

In probabilistic tasks, input random variables are often statistically dependent. This fact should be considered in correct computational procedures. In case of the newly developed Direct Optimized Probabilistic Calculation (DOProC), the statistically dependent variables can be expressed by the socalled multidimensional histograms, which can be used e.g. for probabilistic calculations and reliability assessment in the software system ProbCalc.
Making Use of the Principle of Energy Dissipation in the Seismic Design of a Steel Structure of a Steam Boiler / Využití Principu Disipace Při Seismickém Návrhu Ocelové Konstrukce Parního Kotle
Authors: Protivínský Jiří , Krejsa Martin
Published: May 2014

For structural design of steel structures under seismic action there are two possible approaches of global analysis. In global analysis we can consider the structure to behave in linear elastic way or in post-elastic way with developing of plastic hinges during seismic situation. The second method is based on principle of seismic energy transformation into thermal energy. Both design methods are defined in Eurocodes but the post-elastic way is only rarely used because of design complexity. Application of this design method is presented in the entry on an example of a steam power plant boiler structure.
Aspect Ratio of Slender Web & Postbuckling Behaviour / Pomer Strán Štíhlej Steny A Pokritické Pôsobenie
Authors: Psotný Martin
Published: May 2014

Postbuckling analysis of slender web loaded in compression is presented. The non-linear FEM equations [14] are derived from the variational principle of minimum of total potential energy [13]. To obtain the non-linear equilibrium paths, Newton-Raphson iteration algorithm [11], [12] is used. Peculiarities of the effect of the initial imperfections [7], [8] on load-deflection paths are investigated with respect to aspect ratio of the web. Special attention is focused on the postbuckling mode of the web.
Accuracy of Approximation of Stress and Displacement Fields in Cracked Body for Estimation of Failure Zone Extent / Přesnost Aproximace Polí Napětí A Posunů V Tělese S Trhlinou Pro Odhad Rozsahu Zóny Porušení
Authors: Sobek Jakub , Veselý Václav , Šestáková Lucie
Published: May 2014

The paper deals with an analysis of the stress and displacement fields in a cracked body. The intention of the authors is to determine the sufficient number of terms of the Williams power series for an accurate approximation of the near-crack-tip fields which can be subsequently usede.g. for estimation of the extent of the fracture process zone in quasi-brittle materials. Values of coefficients of these terms are determined via regression from results of numerical simulations; the coefficients are expressed as functions of the relative crack length. The analysis is conducted on a 2D numerical model of the wedge-splitting test on a modified standard cube-shaped specimen used commonly for testing of cementitious composites; ANSYS FE computational system is employed.
Laboratory Measurement of Deformations of Bidirectionally / Prestressed Masonry Laboratorní Měření Deformací Obousměrně Předpjatého Zdiva
Authors: Stará Marie , Čajka Radim , Matečková Pavlína , Buchta Vojtěch
Published: May 2014

This paper deals with laboratory measurements of deformations in the place exposed to local load caused by pre-stressing. The measurements are made at the masonry corner built in the laboratory equipment. The laboratory equipment was designed at Faculty of Civil Engineering VSB-TU Ostrava for measurement tri-axial stress-strain conditions in masonry. In this masonry corner two pre-stressing bars are placed. These bars are in different height and are anchored to the anchor plates, which transfer pre-stressing forces to the masonry. The masonry was pre-stressed in the both directions. The specimen for laboratory testing is performed in the proportion to the reality of 1:1.
Assessment of the Model Uncertainty in Shear Resistance of Reinforced Concrete Beams without Shear Reinforcement / Hodnocení Modelové Nejistoty Pro Smykovou Odolnost Železobetonových Nosníků Bez Smykové Výztuže
Authors: Sýkora Miroslav , Holický Milan
Published: May 2014

The paper is focused on the model uncertainty related to shear resistance of reinforced concrete beams without special shear reinforcement considering available test results. Variation of the model uncertainty with basic variables is analysed and significant variables are identified for the section-oriented formula provided in EN 1992-1-1. Proposed probabilistic description of the model uncertainty consists of the lognormal distribution having the coefficient of variation of 0.15 and the mean value varying from 0.9 to 1.05 for beams with light to heavy longitudinal reinforcement.
Creative Impact Measure of Cros – Cultural Managerial Apects
Authors: Janáková Hana , Magdolen Ľuboš
Published: May 2014

The world today is characterized by intercultural diversity. More and more communication takes place between people with different linguistic as well as cultural backgrounds. This happens because of contacts within the areas of business, science, education etc. but also because of immigration brought about by labour shortage or unstable political situation. The globalisation of the economy with increased appreciation by companies that managing cultural differences properly can be a key factor in getting things done effectively across borders. With increased contact of personnel and customers from diverse cultural background, there is a growing demand for businesses to understand and manage the diverse values, perceptions, business worldviews and behaviour of corporations, staff, and its customer. Intercultural communication and management is an interdisciplinary human resources field concerned with faciliting communication, management and effective interaction of personnel and customers across borders. The starting point for understanding consumer behaviour is really important. Marketing and environmental stimuls enter the consumer’s conscioussnes, and set of psychological processes combine with certain consumer characteristics to resault in decision processes and purchase decision. The marketer’s task is to understand what happened in the consumer’s consciousness between the arrival of the outside marketing stimuli and the ultimate purchasedecision. Four psychological processes are motivation, perception, learning and also memroy, fundamentaly influence consumer responses. Understanding consumer behaviour may often be complicated since many different factors influence the behaviour and sicnce many different forms of behaviour exist. Paper describe fuzzy concept for evaluation of some cros-cultural impact and compare it with other type of measurements presented in literature.
Paul-Henri Spaak, héraut ou soliste du socialisme belge ?
Authors: Conord Fabien
Published: May 2014

Paul-Henri Spaak (1899-1972) est l’un des principaux hommes politiques de la Belgique au XXe siècle. Il fut Premier ministre à trois reprises (1938-1939, 1946 et 1947-1949) mais aussi président de plusieurs instances européennes et secrétaire général de l’OTAN. Sa carrière militante commence, de manière éphémère, dans les rangs libéraux et s’achève dans la mouvance francophone mais demeure surtout liée, de manière fort complexe, au socialisme belge pendant presque un demisiècle. Premier chef de gouvernement socialiste de son pays, Paul-Henri Spaak est tour à tour un militant contestataire et un leader controversé. C’est cette relation complexe avec sa formation politique que décrypte cet article. Il restitue les moments de symbiose (planisme, débuts de la Guerre froide et construction européenne) et les éléments de divergence (atlantisme, reconnaissance de l’Espagne franquiste, querelle linguistique) entre Paul-Henri Spaak et le parti socialiste de Belgique, et illustre ainsi la forte autonomie dont il a toujours fait preuve.
L’embrigadement du passé canadien : Les politiques mémorielles du gouvernement Harper
Authors: Frenette Yves
Published: May 2014

Dans ce commentaire critique sur les usages politiques de la mémoire dans le Canada contemporain, l’auteur se penche sur l’embrigadement du passé canadien par le gouvernement de Stephen Harper, depuis son accession au pouvoir en 2006. Il montre comment la reconstruction du passé de la nation s’inscrit dans la volonté refondatrice des conservateurs et il présente les stratégies déployées par ces derniers pour refaire l’histoire du Canada à leur image : mise en exergue des liens unissant les Canadiens à la monarchie et de l’histoire militaire, tentative de faire de la Guerre de 1812 et de la Première Guerre mondiale des événements fondateurs du Canada moderne, création du Musée canadien de l’histoire. En parallèle, l’auteur présente le démantèlement dont est victime Bibliothèque et Archives Canada, le principal dépositaire de la mémoire canadienne.
Conscripting Canada’s Past: The Harper Government and the Politics of Memory
Authors: Frenette Yves
Published: May 2014

In this critical commentary on the political uses of memory in contemporary Canada, the author examines the conscription of the Canadian past by the Harper government since it came to power in 2006. He shows how the conservatives’ reconstruction of the nation’s past serves their broader project of reconstructing the nation tout court. Moreover, he presents the various strategies they have deployed to remake Canada’s history in their own image: the increased emphasis on military history and on the ties that bind Canadians to the monarchy; the endeavour to cast the War of 1812 and the First World War as foundational events in the making of modern Canada; the creation of the Canadian Museum of History. The author also discusses the dismantling of Library and Archives Canada, the main repository of the nation’s memory.
Enhanced Dietetics Education Through Collaboration: A Study to Identify Opportunities
Authors: Proudfoot Allison , Lordly Daphne , Anderson Barb , Gillis Doris
Published: May 2014

With the aim of enhancing dietetics education in Nova Scotia, key stakeholders were engaged in identifying current practice issues along with opportunities for collaboration to address them. A survey containing five open-ended questions was distributed by email to a purposive sample of 24 participants affiliated with three universities with dietetics programs. Participants fell into five categories: internship coordinators, dietetics educators, recent internship graduates, current interns, and prospective interns. The response rate was 58%. Data were thematically analyzed through a process of constant comparison. Primary themes emerged, which reflected survey participants’ concerns about three current practice issues: province-wide standards, internship placement availability, and the overall educational experience. Additional comments suggested that overall dietetic educational experiences could be improved if relevant clinical experiences were offered and preceptor workloads were accommodated. The creation of province-wide standards for assessing interns’ level of competency was perceived to offer multiple benefits, including decreased preceptor workloads. Participants believed that collaborative actions might increase internship placements and improve the overall dietetic internship experience for interns and preceptors.
Picture This: A Photovoice Study Of International Students’ Food Experience in Canada
Authors: Amos Stephanie , Lordly Daphne
Published: May 2014

Purpose: International student enrolment in Canadian universities is increasing. As international university students acculturate, they experience a culture shock in which food plays a major role. International university students’ Canadian food experiences therefore were explored.

Methods: A Photovoice methodology was used with 15 international undergraduate and graduate university students, who were recruited to take pictures of their food experiences. They also participated in two focus group discussions that included an analysis of their photos.

Results: Seven themes related to the significance of food in acculturation were revealed: the paradox of Canadian convenience, the equation of traditional foods with health, traditional food quality and accessibility, support networks, food consumption for comfort, ethnic restaurants, and the exploration of non-traditional foods. Maintaining cultural identity with traditional foods was an overarching theme related to acculturation.

Conclusions: International students acculturating to Canada have emotional and physical needs, which can be met through food. Opportunities exist to improve their acculturation experiences. Canadian universities can incorporate food acculturation strategies into campus events and menus. Nutrition professionals on campus can facilitate a positive food environment and nurture culture identity formation.