Phase stability

Part 1 book "Geotechnical engineering - Principles and practices of soil mechanics and foundation engineering" includes content: Introduction, soil formation and characterization, soil phase relationships, index properties and classification, soil permeability and seepage, effective stress and pore water pressure, stress distribution in soils due to surface loads, compressibility and consolidation, shear strength of soil, soil exploration, stability of slopes, lateral earth pressure.

499p dianmotminh04 12-07-2024 0 0   Download

In low-cost permanent magnet synchronous motor (PMSM) drive systems, the rotor position is usually estimated based on the back-electromotive force. However, such estimation methods have the common drawback of having large errors in low-speed regions. In order to solve that drawback in the startup phase, the I-f startup method is studied as its compatibility with the FOC control structure. The purpose of such a method is to make the motor accelerate and overcome the low-speed threshold.

8p vialicene 02-07-2024 1 0   Download

The article will focus on calculating the stability parameter of the plate depending on the number of cracks, crack length, crack inclination angle, elastic foundation parameters as well as the ratio of material composition in the plate.

13p viwalton 02-07-2024 3 1   Download

The geometries and relative stabilities of 15 tautomeric forms and the corresponding isomers of the studied molecules have been identified and their relative stabilities are investigated. The potential energy profiles and intrinsic reaction coordinates (IRC) calculations along the proton transfer coordinates both in the ground and in the excited state are monitored as well. The impact of the donating (OMe) and withdrawing (NO2) groups on the single and double proton transfers are investigated both in the gas phase and solution.

9p dianmotminh02 03-05-2024 4 1   Download

With Beech veneers being treated with 10% solid content of the chemicals from paper (Alkyl ketene dimer, AKD), wood (N-methylol melamine, NMM-1) and textile industry (fatty acid modified N-methylol melamine, mNMM-2), the results showed that the treatments with these chemicals considerably increased the water repellence effectiveness (WRE) of veneers in the initial submersion phases. In this paper, veneers treated with Nmethylol melamine and AKD chemicals were investigated on water/moisture related properties and their stability after cyclic tests.

12p vilarry 01-04-2024 1 1   Download

The thesis "Stability of some classes of degenerate two-phase difference systems with delay" is to study the stability of degenerate two-phase systems with mixed delay in the direction of variation; Stability and dissipation in finite domain of degenerate 2-D system with variable delay; Evaluation of the gain set and control design for a degenerate 2-D system in the Roesser model with variable delay;... Please refer to it!

120p gaupanda019 21-03-2024 4 1   Download

Part 2 book "Advanced thermodynamics engineering" includes content: Thermodynamic properties of mixtures; phase equilibrium for a mixture; stability; chemically reacting systems; reaction direction and chemical equilibrium; availability analysis for reacting systems; problems.

388p muasambanhan06 03-02-2024 1 1   Download

Part 2 book "Advanced thermodynamics engineering" includes content: Thermodynamic properties of mixtures; phase equilibrium for a mixture; stability; chemically reacting systems; reaction direction and chemical equilibrium; availability analysis for reacting systems; problems.

388p muasambanhan06 03-02-2024 3 1   Download

Part 2 book "Thermodynamics and an introduction to thermostatistics" includes content: Stability of thermodynamic systems, first order phase transitions, critical phenomena, the nernst postulate, summary of principles for general systems, properties of materials, statistical mechanics in the entropy representation - the microanonical formalism, quantum fluids, variational properties, perturbation expansions, and mean field theory,... and other contents.

293p muasambanhan06 03-02-2024 2 1   Download

Part 1 of ebook "Life cycle costing for the analysis, management and maintenance of civil engineering infrastructure" provides readers with contents including: life cycle cost analysis of the UK housing stock; case study of life cycle analysis of a community hydroelectric power system in rural Thailand; selection indicators for stabilization of pavement systems; pavement type selection for highway rehabilitation based on a life-cycle cost analysis - validation of California interstate 710 project (Phase 1);...

116p hanlinhchi 29-08-2023 7 3   Download

The preparation of controlled phases of the MoTe2 ultra-thin films, achieved by isothermal close space tellurization, is very important for the different applications from semiconductor sensors to unique nonsaturating magnetoresistance and strongly reinforced superconductivity.

8p viberbers 09-08-2023 11 3   Download

We succeed to retain the high-temperature (cubic) γ-U phase down to low temperatures in U-T alloys with less required T alloying concentration (T= Mo, Pt, Pd, Nb, Zr) by means of splat-cooling technique with a cooling rate better than 106 K/s.

7p viberbers 09-08-2023 4 3   Download

This paper presents a design of the two-stage op-amps (OPA) using 90nm process with functional verification and gain calculations. In order to improve stability, the compensation technique is added to OPA to improve performance metrics. According to simulation results, the designed OPA obtains a gain of 131dB with 60 degrees phase margin.

5p vifalcon 16-05-2023 6 2   Download

This research proposes the dynamic stability improvement of a large-scale power system which consists of a conventional synchronous generator (SG)-based power plant integrated with a doubly-fed induction generator (DFIG)-based wind farm by using a generalized unified power-flow controller (GUPFC). The complete dynamic mathematical equations of the studied system are established in dq-axis reference frame under three-phase balanced conditions.

8p vidoctorstrange 06-05-2023 3 2   Download

Rotary Inverted Pendulum (RIP) plays a vital role in control engineering. Rotary Inverted Pendulum is a complex, nonlinear, non-minimum-phase and under-actuated system which has various applications in the field of Robotics. The main contribution of this paper is to design and control RIP by using Linear Quadratic Regulator (LQR) controller for stabilization at vertically upright position - the unstable equilibrium point, and Linear Quadratic Tracker (LQT) controller for tracking the desired trajectory.

11p vicaptainmarvel 21-04-2023 8 4   Download

This publication is divided into five sections, two appendixes, and a bibliography—one section for each of the four phases of disaster response planning. The fifth section contains responses and procedures for stabilization and basic treatment of some collections, once the recovery process is in full swing. The first appendix includes checklists and forms that go with the different sections of the planning and prevention phases, and the second appendix lists different organizations, companies, and suppliers of disaster response services, consultation, and assistance.

167p runthenight08 12-04-2023 9 2   Download

The main aims of this research are: To determine the phase inversion temperatures for the formation of oil-in-brine nanoemulsions at various salt concentrations using conductivity measurements; To prepare the nano-emulsions at PIT points, and study their stability by measuring their droplet size, polydispersity and size distribution using dynamic light scattering technique; To confirm the DLS results using Cryo-SEM technique;...

324p runthenight07 01-03-2023 5 3   Download

This study focuses on the stability of nano-emulsions produced by phase inversion temperature method using n-Decane and n-Dodecane as the dispersed phase and pure water/brine as the aqueous phase (continuous phase). A non-ionic surfactant (Brij 30) was used in the preparation of the nano-emulsions. Three different types salt namely \(NaCl\), \(KCl\) and \(MgC{l_2}\) were used at different concentrations.

173p runthenight07 01-03-2023 2 2   Download

Hylocereus polyrhizus, known as red dragon fruit provides a betacyanin pigment source, which is not only concentrated in the flesh but also present in the peel with high content. Betacyanins are beautiful red-violet pigments used as food additives and stable in a wide pH range from 3 to 6. However, the stability of betacyanins is affected by heat, which causes discoloration.

9p vicedric 08-02-2023 7 3   Download

Sample preparation is the crucial and most challenging part of analytical chemistry for the speciation of environmental pollutants’ traces. Along with the development of the sample preparation methods, the ionic liquid-based microextraction technique plays an important role. Due to the unequivocally unique “green” characteristic of ionic liquids (ILs), they owe their tunable properties, such as highly selective and high reaction efficiency, reusability, and good thermal stability, to present advancements in the sample preparation process.

21p lyhuyenthu 31-01-2023 6 2   Download