High-temperature ferroelectric order and magnetic field-cooled effect driven magnetoelectric coupling in R2BaCuO5 (R= Er, Dy, Sm)

The high-temperature ferroelectric order and a remarkable magnetoelectric effect driven by the magnetic field cooling are reported in R2BaCuO5 (R = Er, Dy, Sm) series. The ferroelectric (FE) orders are observed at much higher temperatures than their magnetic orders for all three members. The value of FE Curie temperature (TFE) is considerably high as ~ 235 K with the polarization value (P) of ~ 1410 {\mu}C/m2 for a 4 kV/cm poling field in case of Er2BaCuO5, whereas the values of TFE and P are also promising as ~ 232 K and ~ 992 {\mu}C/m2 for Dy2BaCuO5, and ~ 184 K and ~ 980 {\mu}C/m2 for Sm2BaCuO5. The synchrotron diffraction studies of Dy2BaCuO5 confirm a structural transition at TFE to a polar Pna21 structure, which correlates the FE order. An unusual magnetoelectric coupling is observed below the R order for Er and Dy compounds and below the Cu order for Sm compound, when the pyroelectric current is recorded only with the magnetic field both in heating and cooling cycles i.e. typical magnetic field cooled effect. The magnetic field cooled effect driven emergence of polarization is ferroelectric in nature, as it reverses due to the opposite poling field. The unexplored R2BaCuO5 series attracts the community for large TFE, high P value, and strange magnetoelectric consequences.Comment: 9 figures and 2 supporting figure

Effect of quenching process on mechanical properties of flax/polypropylene composites

Flax/polypropylene needle - punched nonwovens (550 g /m2) have been produced and then used as a preform for theproduction of composites. In this study, better infiltration of polypropylene melt into the flax fibres has been achieved byaltering the crystal structure of polypropylene in the preform. A modified sequence of production of composites is alsoproposed. The proposed method yields composite with 25, 98 and, 91% improvement in tensile, flexural and short beamstrength properties as compared to the conventional method of manufacturing

Ayurvedic management of supraspinatus tendon tear: a case report

The two main causes of rotator-cuff injuries are trauma and degeneration. Modern medical sciences recommend operative reconstruction surgery for ruptured injuries of the rotator cuff. But the outcome of surgery often leads to restrictions on movement. In this case, supraspinatus tendon tears with degenerative causes were satisfactorily managed with ayurvedic conservative management alone. A 68-year-old patient was admitted to the Kayachikitsa inpatient department of Vaidyaratnam ayurveda college, Ollur, on September 21, 2023, with right shoulder pain and restricted shoulder movements. In an MRI, the case was diagnosed as a partial tear of the anterior fibres of the supraspinatus tendon of the rotator cuff with sub-coracoid bursitis of the right shoulder joint. On examination of the right shoulder joint, all shoulder movements were restricted due to pain. Hawkins’s impingement test, Neer’s test, and the painful arc test were found to be positive. She underwent a treatment protocol of Vatavyadhi Chikitsa incorporated with Bhagna Chikitsa. Internal and external medications, along with Upanaham, Abhyanga, Thaila pichu, bandage, and active shoulder exercises, were the treatments followed in this case. After the treatment, patient got relief from pain (VAS scale: 7 to 4) and considerable improvement in range of motion (ROM) for the right shoulder joint. This case study highlighted that within one month, the chronic rotator cuff injury got partial functional restoration (SPADI-56 to 30) by conservative ayurvedic management

Self-Adjointness of Generalized MIC-Kepler System

We have studied the self-adjointness of generalized MIC-Kepler Hamiltonian, obtained from the formally self-adjoint generalized MIC-Kepler Hamiltonian. We have shown that for \tilde l=0, the system admits a 1-parameter family of self-adjoint extensions and for \tilde l \neq 0 but \tilde l <{1/2}, it has also a 1-parameter family of self-adjoint extensions.Comment: 11 pages, Latex, no figur

Effects of Molecular Crowding on stretching of polymers in poor solvent

We consider a linear polymer chain in a disordered environment modeled by percolation clusters on a square lattice. The disordered environment is meant to roughly represent molecular crowding as seen in cells. The model may be viewed as the simplest representation of biopolymers in a cell. We show the existence of intermediate states during stretching arising as a consequence of molecular crowding. In the constant distance ensemble the force-extension curves exhibit oscillations. We observe the emergence of two or more peaks in the probability distribution curves signaling the coexistence of different states and indicating that the transition is discontinuous unlike what is observed in the absence of molecular crowding.Comment: 14 pages, 6 figure

Effect of FCNC mediated Z boson on lepton flavor violating decays

We study the three body lepton flavor violating (LFV) decays $\mu^- \to e^- e^+ e^-$, $\tau^- \to l_i^- l_j^+ l_j^-$ and the semileptonic decay $\tau \to \mu \phi$ in the flavor changing neutral current (FCNC) mediated $Z$ boson model. We also calculate the branching ratios for LFV leptonic B decays, $B_{d,s} \to \mu e$, $B_{d,s} \to \tau e$, $B_{d,s} \to \tau \mu$ and the conversion of muon to electron in Ti nucleus. The new physics parameter space is constrained by using the experimental limits on $\mu^- \to e^- e^+ e^-$ and $\tau^- \to \mu^- \mu^+ \mu^-$. We find that the branching ratios for $\tau \to eee$ and $\tau \to \mu \phi$ processes could be as large as $\sim {\cal O}(10^{-8})$ and ${\rm Br}B_{d,s} \to \tau \mu, \tau e) \sim {\cal O}(10^{-10})$. For other LFV B decays the branching ratios are found to be too small to be observed in the near future.Comment: 15 pages, 8 figures, typos corrected, one more section added, version to appear in EPJ