The new vector resonance $X_1(2900)$ observed recently by LHCb in the $ D^{-}K^{+}$ invariant mass distribution decay $B^{+} \to D^{+}D^{-}K^{+}$ is studied to uncover internal structure of this state, and calculate its physical parameters. In present paper, X_1(2900)$ modeled as an exotic J^P=1^- $, built light diquark $u^{T}C\gamma_5d$ heavy antidiquark $\overline{c} \gamma_{\mu}\gamma_5C\ove...

this article is arranged based on a research plan which its goals is evaluation of the possibility of applying flexible human resource structure in industrial organizations. in this research, applying conditions of just in time (j.i.t) and flexible manufacturing systems (f.m.s) have brought up as a pioneer flexible movements in industrial units and based on based two phenomenon, the nescessity ...

Counter to the common belief that expert performance reflects innate abilities and capacities, recent research in different domains of expertise has shown that expert performance is predominantly mediated by acquired complex skills and physiological adaptations. For elite performers, supervised practice starts at very young ages and is maintained at high daily levels for more than a decade. The...

Interleukin-12 (IL-12) is a heterodimeric cytokine produced primarily by antigen-presenting cells (monocytes, macrophages, dendritic cells, and B cells). Its production is stimulated by bacteria, bacterial products, and intracellular parasites and enhanced by priming with granulocytemacrophage colony-stimulating factor (CM-CSF) and interferon-y (IFN-’y) or inhibited by IL-b. The major biologica...

Inferring Earth’s composition is a prerequisite to understanding its evolution and dynamics as well as those of planets like it. One might think that the composition of Earth can be easily inferred from the rocks that we can see on Earth’s surface. However, it immediately becomes obvious that these rocks cannot be the major constituent of Earth’s interior because the densities of typical rocks ...