In this paper, we define the β-partial derivative as well β-directional of a multi-variable function based on β-difference operator, Dβ, which is defined by Dβf(t)=f(β(t))−f(t)/β(t)−t, where β strictly increasing continuous function. Some properties are proved. Furthermore, β-gradient vector and directional introduced. Finally, deduce Hahn-partial Hahn-directional derivatives associated with Ha...

Precise fitting of the experimental data analyzed separately for each identified crystallographic phase (α, ω, β, β′and β") yield different bulk moduli Bo and Bo’ zero pressure volumes (Vo) than those claimed in literature. Special attention is given to bcc phases indicating cascading transitions β → β’→ β” associated with volume collapse. The present analysis reveals existence a bcc-β′ which r...

Objective: Internet addiction and smartphone are emerging mental health concerns in adolescents. To determine the factors related to these conditions, we investigated their associations with sleep quality, chronotype, patterns, daylight exposure, depression, anxiety.Methods: Self-rated questionnaires, including Addiction Proneness Scale-Short Form, Smartphone Scale–short version, Insomnia Sever...

We consider a Stokes-Magneto system in Rd (d≥2) with fractional diffusions Λ2αu and Λ2βb for the velocity u magnetic field b, respectively. Here α,β are positive constants Λs=(−Δ)s/2 is Laplacian of order s. establish global existence weak solutions any initial data L2 when α, β satisfy 1/2<α<(d+1)/2, β>0, min⁡{α+β,2α+β−1}>d/2. It also shown that unique if β≥1 min⁡{α+β,2α+β−1}≥d/2+1, addition.

Introduction: In any job, performing job tasks requires different psychological demands, physical demands and workload, which can lead to physical and psychological problems in the employee. Therefore, the aim of the current research was to predict the health (organizational stress, health complaints, exhaustion and fatigue) of employees from the psychological demands of the job, physical deman...

abstract β-thalassemia major (β –tm) is the most common thalassemia severe phenotype among iranians. in recent years, molecular understanding of pathogenesis of β –tm has provided a great opportunity regarding diagnostic issues. creating comprehensive molecular databases provides highly sensitive diagnostic tools for β –tm and effective prenatal diagnosis (pnd) molecular screening tests. despit...

background and aims. the role of cytokines in the immunopathogenesis of oral lichen planus (olp) has received much attention. the aim of this study was to evaluate the serum levels of tnf-α and tgf-β in patients with olp in an iranian population. materials and methods. thirty-two patients with olp and 32 age-matched healthy volunteers as a control group were included in this study. serum tests ...

conclusions the β-lactamase disk test is appropriately sensitive to detect esbls in mdr isolates of e. coli. background most urinary tract infections (utis) are caused by escherichia coli (e. coli) species. due to infections outbreaks of e. coli strains with multiple mechanisms of resistance to β-lactam antibiotics, the sensitivity of confirmatory tests to detect the extended spectrum β-lactama...

background and objectives: pseudomonas aeruginosa is a frequent opportunistic pathogen in health care associated infections that is highly resistant to the majority of β-lactams. the aims of this study were to access the antimicrobial susceptibility pattern of p. aeruginosa isolated from educational hospitals of qazvin and alborz provinces, to determine the prevalence of metallo-β-lactamase (mb...