Top PDF Concerning the stability of BDF methods

Concerning the stability of BDF methods

Concerning the stability of BDF methods

Vanessa Avansini Botta and Messias Meneguette Jr. Faculty of Sciences and Technology, Sao Paulo State University, Presidente Prudente, SP, Brazil. We present an analysis of Ao-stability [r]

5 Ler mais

Repeatability of associations between analytical methods of adaptability, stability, and productivity in soybean

Repeatability of associations between analytical methods of adaptability, stability, and productivity in soybean

each other, indicating that it is possible to use only one of them to identify genotypes with dynamic stability. However, in the static sense, the choice should be made between one of the following parameters: PPW, WRW, ERd, TAλ, HUS1 and HUS2, AMMI, and PC2. As for adaptability, the choice should be between: ERb, FWb and TAb, SBb1 and SBb12, CRb1 and CRb12, and SVb1 and SVb12. As to the rank parameter, obtained with the GGE method, it refers to the ideal genotype (high production average and high stability) and is associated with LBPg, LBPd, LBPf, ANWg, ANWd, ANWf, SVmg, SVmd, and SVmf. This indicates that these methods measure simultaneously for yield and stability.
Mostrar mais

11 Ler mais

Técnica experimental para inserção de parafuso no processo articular da coluna cervical inferior

Técnica experimental para inserção de parafuso no processo articular da coluna cervical inferior

stabilization methods in bovine model : Static and cyclic loading. Comparative study of the stability of anterior and posterior cervical spine fixation procedures. The location of the p[r]

93 Ler mais

Current methods for determining the stability of the enterprise Современные методы определения устойчивости предприятия

Current methods for determining the stability of the enterprise Современные методы определения устойчивости предприятия

3) Фінансова стійкість. Коефіцієнти даної групи надають безпосередню характеристику стійкості підпри- ємства до різних негативних екзогенних і ендогенних фак- торів. З даної групи має розглядатися коефіцієнт фінансо- вого важеля (DFL – degree of fіnancіal leverage), що описує принципи залучення капіталу. Чим більше позикового капіталу, тим вище даний коефіцієнт, а виходить, шанси нарощування прибутку зростають, оскільки на рішення саме цієї задачі спрямована дія фінансового важеля ком- панії. Одночасно може зростати і ризик неплатежу:
Mostrar mais

7 Ler mais

Einstein (São Paulo)  vol.12 número3

Einstein (São Paulo) vol.12 número3

Objective: To determine and to analyze the theoretical and practical knowledge of Nursing professionals on indirect blood pressure measurement. Methods: This cross-sectional study included 31 professionals of a coronary care unit (86% of the Nursing staff in the unit). Of these, 38.7% of professionals were nurses and 61.3% nurse technicians. A validated questionnaire was used to theoretical evaluation and for practice assessment the auscultatory technique was applied in a simulation environment, under a non-participant observation. Results: To the theoretical knowledge of the stages of preparation of patient and environment, 12.9% mentioned 5-minute of rest, 48.4% checked calibration, and 29.0% chose adequate cuff width. A total of 64.5% of professionals avoided rounding values, and 22.6% mentioned the 6-month deadline period for the equipment calibration. On average, in practice assessment, 65% of the steps were followed. Lacks in knowledge were primary concerning lack of checking the device calibration and stethoscope, measurement of arm circumference to choose the cuff size, and the record of arm used in blood pressure measurement. Conclusion: Knowledge was poor and had disparities between theory and practice with evidence of steps taken without proper awareness and lack of consideration of important knowledge during implementation of blood pressure measurement. Educational and operational interventions should be applied systematically with institutional involvement to ensure safe care with reliable values.
Mostrar mais

6 Ler mais

Braz. J. Pharm. Sci.  vol.48 número2

Braz. J. Pharm. Sci. vol.48 número2

by exercise and challenge testing, and has been shown to have beneicial effects on the contraction of the diaphragm, an effect which may be particularly useful in patients with COPD (Kidney et al. , 1990; Mak, 1997). Drug-drug inter- actions occur when one therapeutic agent either alters the concentration (pharmacokinetic interactions) or the bio- logical effect (pharmacodynamic interactions) of another agent (Leucuta, Vlase, 2006). The clinical signiicance of a speciic drug-drug interaction depends on the degree of accumulation of the substrate and the therapeutic window of the substrate (Bachmann, Lewis, 2005). The combination of theophylline and ketotifen is often used in respiratory tract infections and some have suggested that the combi- nation is effective (Benjamin et al., 1994), while others have postulated that the combination may be embryotoxic, leading to growth retardation and morphological abnormali- ties (Bechter, Schön, 1988). The major goal of the present study was to elucidate the possible importance of drug-drug interactions (DDIs) as a contributing factor towards drug safety and inally to observe and determine the stability of the complexes which could be formed by the interaction of ketotifen fumarate with anhydrous theophylline in aqueous media at variable pH. The values of the stability constants of theophylline with ketotifen were determined using Job’s continuous-variation analysis and Ardon’s spectropho- tomeric measurement methods. However, following the interaction of theophylline with ketotifen, stability constants ranged between 0.4-2.0 at pH 1.2 and 4.12 at pH. 6. The sta- bility constant values indicate that co-administration of both drugs may reduce the pharmacological effect of the drugs.
Mostrar mais

6 Ler mais

The modification process of AlSi21CuNi silumin and its effect on change of mechanical properties of the alloy

The modification process of AlSi21CuNi silumin and its effect on change of mechanical properties of the alloy

Due to difficulties present during machining operations and with segregation of crystals of primary silicon, hypereutectic silumins can be used after modification only. It is why elaboration of effective modification methods is necessary for complete utilization of such alloys for machinery parts made from castings. In the paper are presented test results concerning an effect of modification with phosphor copper and strontium of AlSi21CuNi silumin on change of its mechanical properties (R B m B , A B 5 B ) and its structure. Investigated alloy was melted in
Mostrar mais

4 Ler mais

Simple Methods for Stability Analysis of Nonlinear Control Systems

Simple Methods for Stability Analysis of Nonlinear Control Systems

The Popov criterion is considered as one of the most ap- propriate criteria for nonlinear systems and it can be com- pared with the Nyquist criterion for linear systems [4]. However there are reservations that relate to the very es- sence, correctness and reliability of the criterion. It is nec- essary to emphasise that this criterion is reliable, but the conditions of its appl. should be clearly specified in advance. Table II: Lyapunov´s functions for second-order systems

6 Ler mais

Primary Teachers’ Views Concerning the Assessment Methods Used by Them

Primary Teachers’ Views Concerning the Assessment Methods Used by Them

Developing of a country in both economic and social areas and maintaining of this development are related to a generation that is trained with a quality education. Reaching contemporary civilization level is only possible with teachers implementing their tasks in a real effective way. In education-teaching process, an important feature which teachers need to have is to possess adequate assessment knowledge and put it into practice. Therefore, assessment has an important role in teaching process. Because, assessment provides feedback for teacher about students’ learning in the education-teaching process. The primary education curriculum which was renewed in 2004, is based on constructivist approach. Constructivist approach emphasizes on learning and teaching strategies focusing on student and it takes personal differences into consideration. In this approach, new information that is taken by
Mostrar mais

18 Ler mais

A coarse-grained elastic network atom contact model and its use in the simulation of protein dynamics and the prediction of the effect of mutations.

A coarse-grained elastic network atom contact model and its use in the simulation of protein dynamics and the prediction of the effect of mutations.

Our results show that a small modification of the long-range interaction term in the potential energy function of STeM had an important positive impact on the model. This small change improves the method in comparison to existing NMA methods in the traditional areas such as the prediction of b-factors and conformational sampling (overlap) where coarse-grained normal mode analysis are applied. More importantly however, it opens an entire new area of application to coarse-grained normal mode analysis methods. Specifically ENCoM is the first coarse-grained normal-mode analysis method that permits to take in consider- ation the specific sequence of the protein in addition to the geometry. This is introduced through a modification in the long- range interactions to account for types of atoms in contact modulated by their surface in contact. As a validation of the approach we explored the ability of the method to predict the effect of mutations in protein stability. In doing so we created the first entropy-based methodology to predict the effect of mutations on the thermodynamic stability of proteins. This methodology is entirely orthogonal to existing methods that are either machine learning or enthalpy based. Not only the approach is novel but also the method performs extremely favourably compared to other methods when viewed in terms of both error and bias.
Mostrar mais

21 Ler mais

Emulsões de óleo de copaíba: determinação do equilíbrio hidrófilo-lipófilo crítico (EHLC), propriedades e estabilidade físico-químicas

Emulsões de óleo de copaíba: determinação do equilíbrio hidrófilo-lipófilo crítico (EHLC), propriedades e estabilidade físico-químicas

7. ABSTRACT During the last decades, it has been a huge interest from the pharmaceutical industries on essential oils and various plant extracts because of their low toxicity and high biodegrability. Copaiba oil (Cop) is a popular medicine in natural form as an anti- inflammatory and anti-infective agent to treat various conditions such as sore throat, ulcers, urinary and pulmonary afflictions. Emulsions are defined as a thermodynamic instable dispersed systems consisting of microscopic dispersions of liquid droplets within another liquid. The aim of this work was to prepare different Cop emulsions and evaluate their stability in order to determine the critical HLB of oil, beyond, to perform a comparative study among different methods from the construction of phase diagrams. The emulsions were prepared by the phase inversion method at different ratios varying the HLB from 4.7 to 16.7. The stability was determined by various methods and phase diagrams were produced by titration method using different stirring procedures. Concerning the Cop-containing emulsions, the ones that presented HLB range from 12.7 to 15.7 were the most stable. The emulsions were presented good short and long-term stability, milky aspect and low creaming index values. Different colloidal structures were produced in phase diagrams, depending on the stirring process. Based on these methods, the required HLB values of Cop were determined as 14.8, the emulsion remained stable for a period exceeding one year and these results indicate that the studied emulsion based on Cop may be a promising vehicle for topical delivery of drug and cosmetic active.
Mostrar mais

67 Ler mais

	Field Cancerisation of the Upper Aerodigestive Tract: Screening for Second Primary Cancers of the Oesophagus in Cancer Survivors

Field Cancerisation of the Upper Aerodigestive Tract: Screening for Second Primary Cancers of the Oesophagus in Cancer Survivors

Tobacco, alcohol, and betel quid are the main causes of squamous cell cancers of the upper aerodigestive tract. These substances can cause multifocal carcinogenesis leading to multiple synchronous or metachronous cancers of the oesophagus, head and neck region, and lungs (‘ield cancerisation’). Globally there are several million people who have survived either head and neck squamous cell cancer (HNSCC) or lung cancer (LC). HNSCC and LC survivors are at increased risk of developing second primary malignancies, including second primary cancers of the oesophagus. The risk of second primary oesophageal squamous cell cancer (OSCC) ranges from 8-30% in HNSCC patients. LC and HNSCC survivors should be ofered endoscopic surveillance of the oesophagus. Lugol chromoendoscopy is the traditional and best evaluated screening method to detect early squamous cell neoplasias of the oesophagus. More recently, narrow band imaging combined with magnifying endoscopy has been established as an alternative screening method in Asia. Low-dose chest computed tomography (CT) is the best evidence- based screening technique to detect (second primary) LC and to reduce LC-related mortality. Low-dose chest CT screening is therefore recommended in OSCC, HNSCC, and LC survivors. In addition, OSCC survivors should undergo periodic pharyngolaryngoscopy for early detection of second primary HNSCC. Secondary prevention aims at quitting smoking, betel quid chewing, and alcohol consumption. As ield cancerisation involves the oesophagus, the bronchi, and the head and neck region, the patients at risk are best surveilled and managed by an interdisciplinary team.
Mostrar mais

8 Ler mais

Evaluation of susceptibility of the ZRE1 alloy to hot cracking in conditions of forced strain

Evaluation of susceptibility of the ZRE1 alloy to hot cracking in conditions of forced strain

The nil strength temperature (NST) for the alloy was determined by testing cylindrical Ø 6 x 90 mm specimens on the Gleeble 3800 simulator. S-type thermocouples were pressure welded to the specimens, and then the specimens were fixed in the chamber by means of copper holders. Constant distance of 52.4 mm was kept between the holders. After evacuation of air, the chamber was filled with argon (to 0.14 hPa). Then, the 0.6 – 0.7 kN minimum pre-load was applied and was maintained until the end of experiment. The specimens were heated at the 20 o C/s rate to 400 o C, and then at the 1 o C/s rate. The NST was determined as the temperature at which the specimen lost its cohesion. The NST for the ZRE1 alloy in as-delivered state is 535 o C.
Mostrar mais

6 Ler mais

The influence of the arc plasma treatment on the structure and microhardness C120U carbon tool steel

The influence of the arc plasma treatment on the structure and microhardness C120U carbon tool steel

Surface of C120 steel after arc plasma treatment showed tracks have multizone microstructure composed of the remelted zone, heat affected zone and substrate, which can have diversified microhardness. Structure (particularly precipitation of martensite, bainite retained austenite and secondary cementite) in the remelted zone is dependent on the arc plasma treatment parameters. The cooling rate obtained during the treatment by arc plasma of the steels is compared to the cooling rate of the steels during conventional heat treatment. This cooling rate can be estimated on the basis of the standard CCT diagram for C120 steel. Increased of the current intensity of arc plasma lead to of grater areas of materials remelting and it decreases of the cooling
Mostrar mais

4 Ler mais

Statistical Assessment of the Effect of Chemical Composition on Mechanical Properties of Hypereutectic AlSi17CuNiMg Silumin

Statistical Assessment of the Effect of Chemical Composition on Mechanical Properties of Hypereutectic AlSi17CuNiMg Silumin

The above mentioned alloys were fabricated from the following starting materials (Table 1): aluminium in grade AR1 (99,96% Al), silicon of 98,5% purity (rest Fe and other elements), copper (99, 98% Cu), nickel (99, 98% Ni) and cast AG10 alloy (about 10 wt.% Mg). Melts were conducted in a Leybold-Heraeus IS5/III induction furnace with crucible of 0,7kg capacity made from magnesite refractory material. A protective coating of 2NaF and KCl was used. When the furnace temperature of ~ 820 o C had been reached, the melt was subjected to refining treatment with Rafglin-3 in an amount of 0,3 wt.%, followed by modification with Cu-P (~9,95%P). The temperature of pouring was controlled by a NiCr-NiAl TP-202K-800-1 thermocouple immersed in the bath of molten metal.
Mostrar mais

4 Ler mais

Buying Behavior Of Organic Vegetables Product The Effects Of Perceptions Of Quality And Risk

Buying Behavior Of Organic Vegetables Product The Effects Of Perceptions Of Quality And Risk

Quality is defined as the degree of excellence or superiority that an organization’s product possesses (Khan, 2005:28). Consumers judge or perceive the quality of the products and it also called perception of quality, because perception of quality derived from the analysis of consumers on product quality (Sanyal & Datta, 2011:605). Customer perceived value of product quality is a consumer opinion as ability of the product who suitable with expectation of consumer (Terenggana et al., 2013:326). Perception of quality is formed on consumers can be affected by several things including past experience, education, purchasing and consumer community (Yaseen et al., 2011:834), and perception of quality is important in improving the quality of products in the view of consumers (Parrol et al., 2013:603). Since knowledge and consumer needs change time by time, it taken an understanding related consumer perception of quality in evaluated to be known how big influence on purchase intention (Sanyal & Datta, 2011:607). Reviewing consumer behavior in foods, in previous research is often studied through perception of quality (Carrasco et al., 2012:1414). On last studied, perceived quality is the consumer’s judgment about a product’s overall excellence or superiority (Zeithaml, 1988). Meanwhile perceived quality is the judgment a consumer of product which refers to the physical characteristics of the product, and is related more to engineering and food technology (Carrasco et al., 2012). Several things that concern on perception of quality, first are spoke on the advantages related to the assessment of consumer products and the second on the technology applied to products that are both better than similar products. That matter is a critical element for consumer decision making, consequently, consumers will compare the
Mostrar mais

8 Ler mais

The Existence Of Leading Islands Securing And The Border Areas Unitary State Of Indonesia An Analysis In Law Perspective

The Existence Of Leading Islands Securing And The Border Areas Unitary State Of Indonesia An Analysis In Law Perspective

Abstract: The research was carried with the aim to discover the existence of securing the foremost islands and state border region of the Republic of Indonesia reviewed from a legal perspective, which is directly related to the existence of security and dispute resolution methods as well as the governance of the foremost islands and border region in Kalimantan which bordering Malaysia. This study was conducted in Nunukan district and the surrounding provinces of Kalimantan, in this research method that used is normative legal analysis data with juridical and qualitative descriptive approach. The results showed that the security of foremost islands and border region of law perspective in accordance with the Law No. 34 of 2004 regarding the Indonesian National Army has not been implemented to the fullest to realize the security of foremost islands and border region as the frontline of the Republic of Indonesia. The existence of leading islands securing and the border region of the Republic of Indonesia still contain many weaknesses in terms of both governance and security.
Mostrar mais

4 Ler mais

Distributions of grain parameters on the surface of aircraft engine turbine blades

Distributions of grain parameters on the surface of aircraft engine turbine blades

The results of calculations of the areas of non-planar grain surfaces and the grain areas on the projection plane for correct and incorrect macrostructures are presented as distributions with a logarithmic width of classes in Figs. 6 and 7, respectively. 7. Parameters of the grain size distributions in 3D and 2D spaces are presented in Table 1. A supplementary evaluation of the grain size consists of a calculation of the shape and elongation coefficients. The results of the calculations are presented as distributions these values in Figures 8, 9, 10 and 11, respectively, while statistical parameters are shown in Tables 2 and 3.
Mostrar mais

6 Ler mais

Influence of tungsten and titanium on the structure of chromium cast iron

Influence of tungsten and titanium on the structure of chromium cast iron

stage, the content of manganese was made up with an addition of ferromanganese and the melt was held for 3 minutes. During holding of the melt and before tapping, the temperature of liquid iron was measured with a thermocouple. The melt was transferred to a ladle, which was next transported to the casting stand and molten metal was poured into the previously prepared moulds. Test bars with a φ 15 mm diameter and castings were made following the production regime adopted by HARDKOP Foundry at Trzebinia. As a next step, specimens were prepared for metallographic examinations. Chemical composition of the cast iron phase constituents was examined using a JEOL 500LV scanning electron microscope with attachment for X-ray microanalysis (EDS).
Mostrar mais

4 Ler mais

Analytical Determining Of The Steinmetz Equivalent Diagram Elements Of Single-Phase Transformer

Analytical Determining Of The Steinmetz Equivalent Diagram Elements Of Single-Phase Transformer

This model, preached by any teacher of electrical engineering to his students on the various levels, was given like postulate. This article proposes an analytical justification to the equivalent diagram elements of single-phase transformer current, particularly to those of the central branch. The article is organized in three main sections. Section II begins by the calculation of active power consumed in a parallelepiped electromagnetic domain subjected to a variable flow. The result is applied to a shell form single-phase transformer. With open load test, the power consumption linked to the leakage inductance and resistance of the transformer winding is neglected in front of the consumption of the central branch [11]. But it is not the case for a loaded transformer. The methods to determine resistances of the reels are indisputable. This article gives the expressions of the elements of the central branch in the model of Steinmetz starting from the powers and their site. It studies also the variation relation of the iron resistance and the iron reactance compared to the computed values with 220 V. Section 2 is dedicated to this calculation. Discussions and a comparison of results are described in Section 3. The final section is devoted to the article conclusion.
Mostrar mais

8 Ler mais

Show all 10000 documents...