Purpose The purpose of this paper is to analyze the best way create value in Portugal through quality and innovation also check what needs be improved. Design/methodology/approach A questionnaire was applied population 152 companies, with research development (R&D) management certified by Portuguese Standard NP 4457. final sample 66 which correspond 45 percent population. Statistical analysis data collected performed using IBM SPSS Software. Findings authors highlighted main...

This paper describes two algorithms for determining the value of a given system parameter that causes crossing complex-conjugate eigenvalue pair through small-signal stability boundary (Hopf bifurcation). A large-scale test was utilized to validate proposed Hopf bifurcation algorithms. The results presented demonstrate computational efficiency and numerical robustness

Objective: This study aims to investigate the processes of creation, adaptation, and renewal strategic resources in irrigated fruit farming sector, focusing on producers from Nilo Coelho Irrigation District (DINC) Petrolina, Brazil, understand how these enable their insertion into international markets. Theoretical Framework: The research is grounded Resource-Based View (RBV), Dynamic Capabilities, Life Cycle Theory, Teleological Institutional providing a solid basis analyze challenges faced...

ABSTRACT This paper presents a study on peppermint essential oil used as palliative treatment in oncological treatment, which it addresses the benefits of this integrative practice improving adverse symptoms caused by chemotherapy and radiotherapy. project is relevant to portray improvement quality life patients, through correct use oil, has anti-inflammatory properties improves nausea vomiting, importance pharmaceutical attention care assistance with these patients. The objective conduct...

This paper describes two algorithms for determining the value of a given system parameter that causes crossing complex-conjugate eigenvalue pair through small-signal stability boundary (Hopf bifurcation). A large-scale test was utilized to validate proposed Hopf bifurcation algorithms. The results presented demonstrate computational efficiency and numerical robustness

This paper describes an algorithm for the sequential computation of transfer function dominant poles s-domain system models. The is suited modal analysis high-frequency dynamics electrical networks having distributed parameter transmission lines. Results on a 39-bus network containing 34 lines are described to show potential application proposed infinite systems. results clearly demonstrate computational efficiency and numerical robustness algorithm, which quite general may be applied models...

This paper proposes algorithms that will enhance the practical use of modal analysis applied to s-domain models AC power networks. The model allows an easy modeling frequency dependent parameters and transmission lines in It also presents several advantages as compared state-space descriptor system models. Algorithms for calculation poles, transfer function residues response are developed. Results on these included.

This paper describes the use of modal analysis s-domain network models in solution harmonic distortion problems industrial systems. Modal involves computation system poles, transfer function zeros as well their sensitivities to changes parameters. A new sensitivity coefficient and a observability index are introduced. These used solve practical having multiple sources. The results obtained believed demonstrate value proposed method.

This paper describes the use of modal analysis in electromagnetic transient studies ac networks having long transmission lines. Modal provides structural information on system and nicely complements results from conventional time frequency response simulations. Results energization a small test system, line, are included. The simulations obtained were compared with those produced by transients program, showing good agreement. methodology may lead to more efficient computation parametric...

This paper reviews the main concepts about power systems security assessment and describes voltage (VSA), transient (TSA) small-signal (SSA) of electrical systems. Most methods SSA are based on calculation oscillation modes evaluation their damping factors. The objective system is to determine distance that these certain boundary. In case, limits are, in general, associated a minimum secure factor modes. proposes nomogram method analysis factors be used for its computational development.

A demonstration example of secondary voltage regulation (SVR) is described. Results on a small test system are presented in tutorial manner, highlighting the benefits gained with use SVR scheme. Two simulation tools were used: transient, mid-term stability program and power flow continuation program. Full data provided, so that results may be reproduced expanded upon by others.

This paper describes a capacitor commutated converter (CCC) model suitable for power flow and transient stability studies. The CCC control structure important operational details are described. practical advantages of the as compared to conventional HVDC discussed. Results presented flow, system stability, small signal analysis design These results clearly demonstrate superior performance link, when connected very weak AC system.

Induction motors constitute almost half of the total load in interconnected power systems. Static and dynamic data-files for large systems do not usually contain ample representation aggregate induction motor loads due to unfavorable cost-effectiveness: low gains obtained quality results justify larger effort required preparing models more sophisticated than constant current hundreds or thousands buses. Modern system analysis software should be suited carry out cost-effective sensitivity...