Top PDF Common Fixed Point Iterations of a Finite Family of Quasi-nonexpansive Maps

Common Fixed Point Iterations of a Finite Family of Quasi-nonexpansive Maps

Common Fixed Point Iterations of a Finite Family of Quasi-nonexpansive Maps

Abstract—It is proved that Kuhfittig iteration pro- cess converges to a common fixed point of a finite family of quasi-nonexpansive maps on a Banach space. This result is extended to the random case. Our work improves upon several well-known results in the cur- rent literature.

5 Ler mais

Convergence of an implicit iteration process for a finite family of asymptotically quasi-nonexpansive mappings in convex metric spaces

Convergence of an implicit iteration process for a finite family of asymptotically quasi-nonexpansive mappings in convex metric spaces

Abstract. In this paper, we give some necessary and sufficient conditions for an implicit it- eration process with errors for a finite family of asymptotically quasi-nonexpansive mappings converging to a common fixed of the mappings in convex metric spaces. Our results extend and improve some recent results of Sun, Wittmann, Xu and Ori, and Zhou and Chang.

10 Ler mais

On the convergence of finite steps iterative sequences with mean errors for asymptotically quasi-nonexpansive mappings

On the convergence of finite steps iterative sequences with mean errors for asymptotically quasi-nonexpansive mappings

and Noor [6] studied some necessary conditions for three- step iterative sequences of asymptotically nonexpansive mappings to converge to fixed points. Cho, Zhou and Guo [7] researched some necessary conditions for three-step iterative sequences with errors of asymptotically nonex- pansive mappings to converge to fixed points. Quan et. al. [8] studied the weak and strong convergence of finite steps iterative sequences with mean errors to a common fixed point for a finite family of asymptotically nonex- pansive mappings.
Mostrar mais

5 Ler mais

An algorithm for finding a common solution for a system of mixed equilibrium problem, quasi-variational inclusion problem and fixed point problem of nonexpansive semigroup

An algorithm for finding a common solution for a system of mixed equilibrium problem, quasi-variational inclusion problem and fixed point problem of nonexpansive semigroup

Very recently, Saeidi [9] introduced a more general iterative algorithm for finding a common element of the set of solutions for a system of equilibrium problems and of the set of common fixed points for a finite family of nonexpansive mappings and a nonexpansive semigroup.

20 Ler mais

Influence of supply voltage frequency of induction coil on inoculation efficiency of pure aluminium structure

Influence of supply voltage frequency of induction coil on inoculation efficiency of pure aluminium structure

Moreover, increase in refinement of aluminium structure results from influence of rotate electromagnetic field on liquid metal in time of its solidification in mould. However in this case effectiveness of inoculation fundamentally depends on value of frequency of supply voltage feeding induction coil, which generates electromagnetic field. Application of frequency of supply voltage f 50 Hz does not guarantee favourable transformation of pure aluminium structure. Whereas induction coil fed with frequency of supply voltage larger than power network i.e. 75 Hz or mainly 100 Hz, generates rotate electromagnetic field, which guarantees favourable refinement of structure from point of view of assumed criterion of minimum value of factor R (Tab. 2 and Fig. 6c). In this case value of factor R is more favourable in comparison with value obtained for aluminium after Ti and B inoculation and after common influence of both modifying factors.
Mostrar mais

6 Ler mais

Determination of Reliability Index and Weibull Modulus as a Measure of Hypereutectic Silumins Survival

Determination of Reliability Index and Weibull Modulus as a Measure of Hypereutectic Silumins Survival

Cast alloys used for high-duty parts operating in automotive industry and aviation should, besides excellent mechanical properties, offer also stable and failure-free performance. A good measure of the reliability of a selected examined property, e.g. the tensile strength Rm, is estimation of the value of Weibull modulus, closely related with the, so called, part’s survival probability [1].

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 paper presents a statistical assessment of the effect of chemical composition on mechanical properties of hypereutectic AlSi17 silumin, which is expected to act as a counterpart of alloys used by automotive industry and aviation for casting of high-duty engine parts in West European countries and USA. The studies on the choice of chemical composition of silumins were preceded by analysis of the reference literature to state what effect some selected alloying elements and manufacturing technology may have on the mechanical properties (HB, R m and A 5 ) of these alloys. As alloying additives, Cu, Ni and Mg in proper combinations were used. The alloy after
Mostrar mais

4 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

This work in combination with industrial tests of casting welding show that the causes of high-temperature brittleness are the partial tears of the structure and the hot cracks of both the castings and the welded and padded joints. Such phenomena should be treated as irreversible failures caused by the process of crystallisation that is in the area of co-existence of the solid and liquid structural constituent. The assessment of the resistance to hot fractures was conducted on the basis of the transvarestriant trial. The transvarestriant trial consists in changing of strain during welding It was stated that the range of the high-temperature brittleness is very broad, which significantly limits the application of the welding techniques to join or mend the elements made of alloy ZRE-1. The brittleness is caused mainly by metallurgical factors, i.e., precipitation of inter-metal phases from the solid solution.
Mostrar mais

6 Ler mais

Assessment Of Some Acceleration Schemes In The Solution Of Systems Of Linear Equations.

Assessment Of Some Acceleration Schemes In The Solution Of Systems Of Linear Equations.

Richardson with SOR, Chebyshev with Gauss-Seidel and Chebyshev with SOR. The iterative schemes were applied to Banded system, Tridiagonal systems and SPD system with varying dimensions. The Krylov subspace methods: GMRES, QMR, MINRES and BiCGSTAB converged to an approximate solutions less than or equal to the dimension of the coefficient matrix for each identified systems of linear equations. Again, Chebyshev and Richardson acceleration methods were the fastest convergence methods in terms of number of iterations. Again, Residual smoothing and the accelerated gradient schemes should be used for large and sparse systems of linear equations. The acceleration processes were very efficient when solving large and sparse systems of linear equation and therefore useful especially for systems resulting from the solution of partial differential equations.
Mostrar mais

8 Ler mais

WP 105 Family Planning and Development: Aggregate Effects of Contraceptive Use

WP 105 Family Planning and Development: Aggregate Effects of Contraceptive Use

Our general idea relies on the assumption that family planning interventions have a first-order effect on fertility decisions. There is a bulk of evidence supporting this. See May (2012) and Schultz (2008), among many others. For instance, Bloom, Canning, Fink, and Finlay (2009) show that removing legal restrictions on abortion significantly reduces fertility and that this has a positive impact on female labor force participation. Joshi and Schultz (2013) study the long-run consequences of a randomized control trial of contra- ception provision in Matlab, Bangladesh. Their findings suggest that treatment villages experienced a decline in fertility of about 17 percent compared to control villages, and that the effects were persistent over a 20-year period. Sinha (2005) estimates similar effects of this family planning experiment on fertility. Using an experiment in Zambia, Ashraf, Field, and Lee (2014) show that the local average treatment effect estimation implies that use of family planning services during about two years of the experiment was associated with a 27 percent reduction in births. Using variation in the timing and location of the Profamilia program in Colombia, Miller (2010) finds that availability of modern contra- ceptives allowed women to postpone their first birth and to have about 5 percent fewer children in their lifetime. 12 Banerjee, Meng, Porzio, and Qian (2014) estimate the effects
Mostrar mais

47 Ler mais

Pesqui. Oper.  vol.23 número1

Pesqui. Oper. vol.23 número1

Helly circle graphs (Durán, 2000) form a natural subclass of circle graphs. We say that G is a Helly circle graph if there exists a chord model L for G satisfying the Helly property. (A family L of chords satisfies the Helly property when every subfamily of pairwise intersecting chords of L has a common point of intersection.) A conjecture by Durán (2000) states that G is a Helly circle graph if and only if G is a circle graph and contains no induced diamonds (a graph formed by four vertices and five edges.)

9 Ler mais

Probabilistic G-Metric space and some fixed point results

Probabilistic G-Metric space and some fixed point results

In this section, first we introduce the concept of G-contractive mapping in Menger probabilistic G-metric space and then its relation with G-contractive map in its dependent G-metric space is studied. This result shows that the existence of a convergent subsequence of an iterate sequence (of a contractive map) implies the existence of a fixed point.

10 Ler mais

Fixed Point Theorems for Weak K-Quasi Contractions on a Generalized Metric Space with Partial Order

Fixed Point Theorems for Weak K-Quasi Contractions on a Generalized Metric Space with Partial Order

The concept of metric was introduced by Frechet [10] as an e xtension of the distance on the real line. Banach contraction principle was given a shape in the context of met ric spaces. Later several generalizations of Banach contraction principle were obtained. Also many generalizations of metric spaces were obtained and Banach contraction principle was extended to such spaces. Some of the generalizations of Banach contraction principle were a lso e xtended to the generalized versions of metric spaces. Czerwik [8] introduced the concept of b-metric spaces in 1993. Since then fixed point results in b-metric spaces were obtained by several authors. Hit zler and Seda [12] introduced the notion of dislocated metric spaces , in the year 2000. In dislocated metric spaces the self distance of a point may be non-zero and this concept has played a very important role in topology and logical progra mming. Severa l authors have studied fixed point theory extensively, [see 2,6,11,14]. Co mbin ing several generalizations of metric spaces Jle li and Sa met [13] obtained a new generalizat ion
Mostrar mais

8 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

products (Kim & Chung, 2011:40), so it’s important to recognize consumer purchasing behavior. Many companies use marketing strategies by analyzing consumer behavior in order to study the effect on purchase decision (Jalalkamali & Nikbin, 2010:235). The purchase decision is also influenced by the perceived quality which is also an aspect of brand value that makes consumers pay for certain products or services (Yaseen et al., 2011:833). It confirms that the consumer purchase decision on products or services is strongly influenced by customer perception of quality of value brand. Decision making is a way of choosing between two or more possible options when a person has a choice between purchasing or not (Schiffman & Kanuk, 2007). In the assessment stages of different choices, the consumers classify different brands and the purchase intention is created in his mind. Shareef et al. (2008) revealed purchase decision is a continuous process, which refers to thoughtful, consistent action undertaken to bring about need satisfaction. Choubtarash et al. (2013) confirmed that purchase decision is a person in the mind who is carefully analyzing the features of products, trademarks or services and tries, by using logical methods, to choose a choice that can satisfy the recognized need with the least expenses. Consumers perceived organic as a healthier alternative to conventional foods in that they contain more nutrients which enhance personal well-being organic produce is also considered safer and better in taste and more enjoyable than conventional products (Shaharudin et al., 2010:72). Last organic purchasing is defined as purchasing goods and services which have less harmful for environmental and human health (Othman & Rahman, 2014:93). Purchasing decisions can be measured through several dimensions, including recommend, purchase frequency, overall satisfaction and purchase intention (Shareef et al., 2008:101). The measure is not different from the study by Liu et al. (2009:72) which provide specifications for purchasing decisions by some measures, including product selection, brand selection, object selection, purchase opportunity, and purchase quantity. Consumer purchasing decisions on products had relationship with consumer perceptions of quality and risk products (Yee et al., 2011:47). Consumer interest in the products can be improved by an increase in the quality of products (Kwak & Kang, 2009:85). And previous research has argued that a consumer perception of quality has a positive impact on consumer buying behavior (Wang & Tsai, 2014:27). Based on these studies, next hypothesis as follows:
Mostrar mais

8 Ler mais

Effect of water glass modification with nanoparticles of zinc oxide on selected physical and chemical properties of binder and mechanical properties of sand mixture

Effect of water glass modification with nanoparticles of zinc oxide on selected physical and chemical properties of binder and mechanical properties of sand mixture

The unmodified water glass shows inadequate wetting of the surface of the quartz grains (Fig. 3). Changes of contact angle in time are characterised by high values of both the initial contact angle θ 0 (about 45 deg.) a nd the equilibrium angle θ r (about 33

4 Ler mais

The Influence of Small Amounts of Aluminium on the Spheroidization of Cast Iron with Cerium Mischmetal

The Influence of Small Amounts of Aluminium on the Spheroidization of Cast Iron with Cerium Mischmetal

Molten charge cast iron, after being overheated up to 1400°C, was treated with aluminium introduced beneath the metal mirror. The melt was heated again up to 1360- 1380°C, then cerium mischmetal was added, and the roasted ferrosilicon was introduced five minutes later. The quantities of cerium mischmetal and ferrosilicon were equal to 0.11% and 1.29% of the achieved cast iron mass. Such quantities had been found optimal in the case of spheroidization process of low-aluminium cast iron containing about 3% Al [14]. Five minutes after the graphitizing modification with ferrosilicon, sand moulds were poured with molten metal directly from the crucible. The specimens were cast in the shape of truncated cones, their average diameter (measured halfway along their test parts) being equal to 20 mm.
Mostrar mais

6 Ler mais

SPATIAL DISTRIBUTION OF SOME ECTOMYCORRHIZAL FUNGI (RUSSULACEAE, FUNGI, BASIDIOMYCOTA) IN FOREST HABITATS FROM THE NORTH-EAST REGION (ROMANIA)

SPATIAL DISTRIBUTION OF SOME ECTOMYCORRHIZAL FUNGI (RUSSULACEAE, FUNGI, BASIDIOMYCOTA) IN FOREST HABITATS FROM THE NORTH-EAST REGION (ROMANIA)

The second group comprised Aro orientalis – Carpinetum, Dentario quinquefoliae – Carpinetum, Aceri tatarico – Quercetum roboris, Quercetum robori – petraeae, Genisto tinctoriae – Quercetum petraeae and Acer campestre with Quercus robur communities. This group was characterized by increased frequencies and dominance of Quercus sp., lower values for Fagus sp., while the other two tree genera had maximum probabilities of occurrence ranging from 40% to 100%. The last cluster included Lathyro venetus – Fagetum *fagetosum and was characterized (distinctively from other plant communities) by Fagus sp. dominance and Quercus sp. low occurrence probability (maximum of 20%). Also, the cluster groups the only combination of low Quercus sp. probability occurrence with high Carpinus sp. occurrence probability. Both sub-associations of Lathyro venetus – Fagetum provides maximum probability of occurrence for mushrooms specialized with Fagus genera, as there were, in this study, Lactarius subdulcis and Russula olivacea. Regarding the differentiation between the second and the third clusters, the fungi that had large amplitude probability of occurrence were Lactarius quietus, L. subdulcis and Russula olivacea, all having only one tree genera host. This showed that, mushrooms affinity for particular tree genera can prove as an important driver for an entire fungal group. As others authors found, dominant tree species is one of the main drivers for shaping fungal communities in temperate forests [GOLDMANN & al. 2015; SHI & al. 2013]. Fungal species having multiple tree hosts, like Russula delica, R. graveolens, R. grisea, R. heterophylla and R. vesca, could be found in more forest types having at least one tree genera host in its composition. Because of that, at regional scales, some mushrooms can be found in many ecosystem types, from Mediterranean [ANGELINI & al. 2015; AZUL & al. 2011] to temperate forests [BUÉE & al. 2011], as shown for ECM species like Russula cyanoxantha or R. delica.
Mostrar mais

15 Ler mais

Solvable monoids with commuting idempotents

Solvable monoids with commuting idempotents

injective orientation preserving partial transformations on a chain with n elements. A natural question then arose: what happens when we compute the Abelian kernel of the Abelian kernel and so on? This was a strong motivation for the present paper since, as the Abelian kernel of a finite group G coincides with the derived subgroup of G, we can use iterations of the Abelian kernel to define solvable monoids, just as we use iterations of the derived group to define solvable groups. Let us observe that there are other properties of groups, for example, being poly-cyclic, which have attracted the attention of many researchers and could be object of the same kind of generalisation, but we will not explore these in the present paper.
Mostrar mais

23 Ler mais

About periodic and quasi-periodic orbits of a new type for twist maps of the torus

About periodic and quasi-periodic orbits of a new type for twist maps of the torus

R.I.C’s. In this case, we can apply the same criteria explained for the standard map. But as there are 2 parameters, we do not obtain a critical value, we obtain a critical set in the (γ , α) plane. Another important application of this theory is to obtain properties about the structure of the unstable set of the above mentioned homoclinic loop (to the saddle-center equilibrium), when the former is unstable. The periodic orbits given by theorem (1) were analyzed in (Addas-Zanata and Grotta Ragazzo 2001) and it was proved that for every vertical rotation number m n > 0, there is an open set in the parameter space with a m n -periodic orbit which is topologically a sink. In particular, it can be proved that, for a fixed value of γ > 0, given an ǫ > α cr (γ ) > 1, where α cr (γ )
Mostrar mais

7 Ler mais

Growth of number of periodic orbits of one family of skew product maps

Growth of number of periodic orbits of one family of skew product maps

Although the study of the skew product maps appear as a modulation of heterodimensional cycles, their study is important by itself. The role of the skew products is similar to the one of the shift for the study of the horseshoe. As in heterodimensional cycles, the fiber dynamics are given by a system F t of iterated functions. In fact, this is an important tool of this work.

13 Ler mais

Show all 10000 documents...