Search results for " Stab"

Vadošās acs stabilitāte un binokulārā konkurence

2017

Bakalaura darbs ir uzrakstīts latviešu valodā , tā apjoms 27 lapas. Darbs satur 27 attēlus, 3 tabulas un 28 atsauces uz literatūras avotiem. Pētījuma mērķis ir noskaidrot motorās vadošās acs un sensorās vadošās acs ietekmi uz dominances ilgumu binokulārās konkurences laikā. Noskaidrot, kā binokulārās konkurences attēlu maiņu ietekmē vadošā acs un tās stabilitāte. Novertēt vadošās acs un vadošās sensorās acs sakritību un to ietekmi uz dominances ilgumu binokulārās konkurences laikā, kā attēlu maiņu ietekmi binokulārās konkurences laikā.

Efektivitātes pilnveidošana uzņēmumā MCĀBOLS.

2019

Bakalaura darba tēma ir “Efektivitātes paaugstināšana uzņēmumā MCĀBOLS”. Šobrīd efektivitāte ir aktuāla tēma visu nozaru uzņēmējiem, jo, mūsdienās, izmantojamie resursu veids ir ierobežots. Bakalaura darba mērķis ir i izanalizēt ietekmējošos faktorus, kuri ietekmē efektivitāti uzņēmumā un izstrādāt priekšlikumus tās paaugstināšanai. Mērķu sasniegšanai veikts teorijas apkopojums, darbinieku apmierinātības aptaujas, regulāras pārrunas ar vadību, un iesaiste ražošanas procesā, lai, sasniegtu izvirzīto mērķi. Bakalaura darbs izveidots trijās nodaļas. Pirmajā nodaļā apkopota teorija, otrajā nodaļa veikts uzņēmuma raksturojums un iekšējās, ārējās vides analīze. Trešajā nodaļā ir efektivitāte anal…

Ricostruzione paleoclimatica degli ultimi 16.000 anni nella carota MSK12-C1 (Tirreno Meridionale)

2013

Dual Inequalities for Stabilized Column Generation Revisited

2014

Column generation (CG) models have several advantages over compact formulations: they provide better linear program bounds, may eliminate symmetry, and can hide nonlinearities in their subproblems. However, users also encounter drawbacks in the form of slow convergence, also known as the tailing-off effect, and the oscillation of the dual variables. Among different alternatives for stabilizing the CG process, Ben Amor et al. [Ben Amor H, Desrosiers J, Valério de Carvalho JM (2006) Dual-optimal inequalities for stabilized column generation. Oper. Res. 54(3):454–463] suggest the use of dual-optimal inequalities (DOIs) in the context of cutting stock and bin packing problems. We generalize th…

Innovative Vehicle-Trailer Connection for Yaw Stability Improvement

2014

As well known, dangerous conditions may occur for the lateral stability of the road vehicles on increasing the running velocity. While it is easy to make up for this drawback in the case of a vehicle alone, by a proper weight distribution, the unstable trend may worsen unfavourably for the vehicle-trailer configuration, imposing a very hard correction task to the driver, who has to cope with the development of two types of instability, exponentially divergent or swaying with increasing amplitude. The critical velocity depends on the geometrical and inertial characteristics of the car-trailer system, on the cornering stiffness of the tires and on the weight distribution among the axles. The …

Vibration control of vehicle engine-body systems with time delay: an LMI approach

2013

The objective of this chapter is to study the problem of vibration control analysis and synthesis in a vehicle engine-body vibration structure. It is assumed that the actuator is subject to a time-varying delay for control of bounce and pitch vibrations. Based on a Lyapunov-Krasovskii functional and using some free weighting matrices, delay-dependent sufficient conditions for designing desired state- and output-feedback controllers are given in terms of linear matrix inequalities (LMIs). The state- and output-feedback controllers, which guarantee asymptotic stability with a prescribed γ-level L2-gain (or H∞ performance), are then developed directly instead of coupling the second-order model…

A convex optimization approach for vibration control of base isolated structures with limited wireless communication capacity

2010

The problem of H ∞ control design for vibration reduction of a base isolated structure with limited wireless communication capacity is studied in this paper. The network under consideration is subjected to measurement quantization, signal transmission delay, and data packet dropout, which appear typically in a network environment. Based on Lyapunov-Krasovskii functional (LKF) theory, some delay-range-dependent conditions are established for the existence of desired controllers such that the resulting closed-loop system is asymptotically stable and its performance is kept within a prescribed level. Finally, some simulation results are given to illustrate the effectiveness of our method.

Feedback vibration control of a base-isolated building with delayed measurements using h<inf>∞</inf> techniques

2010

In this paper we address the problem of vibration reduction of buildings with delayed measurements, where the delays are time-varying and bounded. We focus on a convex optimization approach to the problem of state-feedback H ∞ control design. An appropriate Lyapunov-Krasovskii functional and some free weighting matrices are used to establish some delay-range-dependent sufficient conditions for the design of desired controllers in terms of linear matrix inequalities (LMIs). The controller, which guarantees asymptotic stability and an H ∞ performance, simultaneously, for the closed-loop system of the structure, is then developed. The performance of the controller is evaluated through the simu…

Comparative Study of Different Methods for the Prediction of Drug–Polymer Solubility

2015

In this study, a comparison of different methods to predict drug-polymer solubility was carried out on binary systems consisting of five model drugs (paracetamol, chloramphenicol, celecoxib, indomethacin, and felodipine) and polyvinylpyrrolidone/vinyl acetate copolymers (PVP/VA) of different monomer weight ratios. The drug-polymer solubility at 25 °C was predicted using the Flory-Huggins model, from data obtained at elevated temperature using thermal analysis methods based on the recrystallization of a supersaturated amorphous solid dispersion and two variations of the melting point depression method. These predictions were compared with the solubility in the low molecular weight liquid ana…

Enzymes involved in vinyl acetate decomposition by Pseudomonas fluorescens PCM 2123 strain

2014

Esterases are widely used in food processing industry, but there is little information concerning enzymes involved in decompositions of esters contributing to pollution of environment. Vinyl acetate (an ester of vinyl alcohol and acetic acid) is a representative of volatile organic compounds (VOCs) in decomposition, of which hydrolyses and oxidoreductases are mainly involved. Their activities under periodically changing conditions of environment are essential for the removal of dangerous VOCs. Esterase and alcohol/aldehyde dehydrogenase activities were determined in crude cell extract from Pseudomonas fluorescens PMC 2123 after vinyl acetate induction. All examined enzymes exhibit their hig…