functions
SERIA A
Matematică și Fizică Aplicate
Excelență în Cercetare
Din 1929
Arhiva Online
Căutare
Ani
ON BOUNDING PROPERTIES OF GENERALIZED ISOSCELES GEOMETRIC CONSTANT
person
Kallal Pal, Sumit CHANDOK
Motivated by the isosceles orthogonality, we introduce a new geometric constant and investigate its bounds in normed spaces and inner product spaces. We obtain the characterization of inner product spaces, uniformly non-square spaces, and superreflexive Banach spaces. Through this geometric...
FIXED POINT RESULTS ON A CLOSED BALL IN A COMPLETE CONTINUOUS CONTROLLED METRIC SPACE WITH APPLICATIONS
person
Mahmood Akhtar KHAN, Abdullah SHOAIB
In this study, complete continuous controlled metric spaces have been discussed. Existence of the fixed points for the mappings satisfying contractive conditions on closed balls in such spaces have been ensured. Additionally, a concrete example is provided to validate our results. Finally, the...
SOLVING SOME DIFFERENTIAL EQUATIONS WITH NEUTRAL DEVIATION ARGUMENTS USING SEVERAL GENERALIZATIONS OF DARBO THEOREM
person
Farnaz Soltanpour, Hamid Majani, Ali Shole Haghighi
The target of this article is to provide a few extensions of Darbo theorem us- ing the techniques of family of measures of noncompactness (FMN) in a Fr´echet space. Several interconnections among assumptions imposed in the proved theorems are indicated. We also show the applicability of the...
SOME FIXED POINT RESULTS FOR QUADRILATERALS PERIMETER CONTRACTION IN b-METRIC SPACE
person
Thanggoulien, L Thangmawia, Nehjamang Haokip
In this paper, mappings called ‘quadrilaterals perimeter contraction’ in b- metric spaces is introduced and some fixed point results are obtained and justified with suitable examples. The quadrilaterals perimeter contraction mappings are also compared with an existing class of mappings called...
A NOVEL SOFT FRACTIONAL IDEALS APPROACH TO CHARACTERIZE DEDEKIND DOMAINS
person
Tasaduk Rashid Mir, M. Yahya Abbasi, Bijan Davvaz
A solid mathematical method for handling uncertainty is offered by the Molodtsov-conceived notion of soft sets. This study investigates the benefits of using soft set theory methods, opening the door for creative approaches to soft multiplicative ideal theory research. Our findings demonstrate...
D-SHADOWING PROPERTY OF G-SPACES AND THEIR ORBIT SPACES
person
Yingcui ZHAO
We introduce the definitions of d-shadowing, asymptotic average shadowing properties and study various of transitive, chain transitive properties for the map f on G-spaces. We show that d-shadowing of f is iteration-invariant, and f and its corresponding induced map bf are equivalent in terms of...
ESSENTIAL CONTRACTIBILITY OF BANACH ALGEBRAS
person
Batoul S. Mortazavi-Samarin, Mehdi Rostami, Amir Sahami
In this paper, a new notion, essential contractibility of Banach algebras, is introduced and some of its properties are examined. The main result is to investigate the essential contractibility of (symmetric abstract) Segal algebras
CHARACTERIZATION OF QUASICOMMUTING GRAPHS OF COMPLETELY SIMPLE SEMIGROUPS
person
Defne SOMER, Didem YEŞIL
In this paper, we introduce the notion of the quasi-center of a semigroup. Based on this concept, we define the quasicommuting graph and the extended quasicommuting graph associated with a semigroup. We show that the extended commuting graph of a semigroup is always a subgraph of its extended...
ON THE ARITHMETIC PROPERTIES OF PARTITIONS INTO PARTS SIMULTANEOUSLY 4-REGULAR AND 9-DISTINCT
person
Mohammed L. Nadji and Moussa Ahmia
In 2017, Keith presented a survey of several restricted partition functions. Following this, the authors initiated an arithmetic and combinatorial study of partitions that are both ℓ-regular (parts indivisible by ℓ) and t-distinct (parts appearing fewer than t times). Denoting the number of such...
Stability of equilibria in a mutualism model: Impact of discrete delays
person
Olfat Al Lakkies, Laurance Fakih, Paul Georgescu, Andrei Halanay
We study a two-species mutualism delay model with two discrete lags τ1, τ2. For the coexistence equilibrium we derive local stability conditions from the characteristic equation. In the no-delay case, stability follows from the Routh– Hurwitz conditions. With one delay, imaginary-axis crossings...
THE STUDY OF EQUILIBRIA IN ABSTRACT ECONOMIES AND GENERALIZED GAMES
person
Saeideh Pirbavafa and S. Mansour Vaezpour
The purpose of this paper is to present a new best proximity point existence theorem for set-valued maps that are almost w-upper semicontinuous. We also give examples that support the usability of our results. Next, we establish new existence results of equilibria for free abstract economies in...
A NONLINEAR ELLIPTIC SYSTEM WITH THE SIGN-CHANGING LOGARITHMIC NONLINEARITIES
person
F. F. Faramarzi, S.H. Rasouli, Somayeh Khademloo
In the present paper, we consider the multiple solutions for a class of nonlinear elliptic system with the sign-changing logarithmic. Under some conditions we obtain at least two nontrivial solutions by logarithmic Sobolov inequality and analysis of the relationship between the Nehari manifold...
AN EXTENSION OF HIGHER ORDER RIESZ TRANSFORMS ASSOCIATED WITH BESSEL OPERATORS
person
Ismail EKINCIOGLU, Salim USMANOV, A. Burcu Ozyurt SERIM
In this paper, we introduce the class of fractional integral operators generated by the generalized shift operator with the kernel satisfying the Dini condition. Furthermore, the focus of this work is that these operators are obtained via a high-order Riesz-Bessel transform and are related to...
LASER-DRIVEN OXYGEN EXTRACTION FROM LUNAR REGOLITH SIMULANTS: A TECHNICAL AND EXPERIMENTAL STUDY
person
Cosmin JALBĂ, Nicu SCĂRIȘOREANU, Axel MÜLLER
This study explores the potential of pulsed laser ablation (PLA) for oxygen extraction from lunar regolith simulants. PLA delivers short, high-energy pulses capable of locally dissociating oxides without requiring gravity or molten containment and can be powered by solar energy. Various regolith...
CHARACTERIZATION OF Tb3+-ACTIVATED BaY2O4 PHOSPHORS' FOR OPTOELECTRONICS APPLICATION
person
Komita SAHU, Ravi Shrivastava, RAMADHIN, and Siteshwari CHANDRAKAR
The synthesis and photoluminescence analysis of Tb3+ doped BaY2O4 phosphor was reported in this work. The modified solid state reaction approach, which is best suited for large-scale production, was used to prepare the sample. Scanning Electron Microscopy (SEM), EDS, and X-ray diffraction were...
THRESHOLD-SENSITIVE ANALYSIS OF BUN VOLATILITY IN THE INTENSIVE CARE UNIT
person
Tijana KEVKIĆ, Dragana TODOROVIĆ and Stevan TODOROVIĆ
In this paper, we analyzed Blood Urea Nitrogen (BUN) time series from 94 adult ICU patients in the multicenter eICU database, using ARCH models originally developed in econometrics. To our knowledge, such methods have not previously been used to study BUN dynamics in critical illness. First, in...
THE EFFECT OFVAGUS NERVE STIMULATION ON THE ELECTROENCEPHALOGRAPHIC SIGNAL
person
Mihai COSTACHE
An original stimulation-recording system was assembled for the study of the brain response to the non-invasive stimulation of vagus nerve aiming to increase the attention and concentration. We applied continuous 5 Hz biphasic impulses and bursts of 5 Hz impulses. The increase of the attention...
EXPERIMENTAL DETERMINATION OF THE DOSE COMPONENT PRODUCED BY THE SCATTERED X-RAYS IN EXTERNAL NASAL PYRAMID RADIOTHERAPY Cristina Madalina NICOLA1 ׳²
person
Cristina Madalina NICOLA
The goal of this work is to estimate and measure doses produced by scattering the X-rays used in the treatment of the nasal pyramid, on the protected eyeballs. Measurements were performed for a radiation field generated with different applicators and for various incident X-ray energies. For the...