Oxygen isotope values of biogenic apatite have long demonstrated considerable promise for paleothermometry potential because of the abundance of material in the fossil record and greater resistance of apatite to diagenesis compared to carbonate. Unfortunately, this promise has not been fully realized because of relatively poor precision of isotopic measurements, and exceedingly small size of so...

Plasmas in bubbles in water are being investigated for their ability to produce chemically reactive species for water purification and medical treatment. The gas forming the bubble is potentially a design parameter for water purification as the type and rate of production of active species may be controllable by the type of gas in the bubble. In this paper, we report on a computational investig...

Optically pumped helium magnetometers are important instruments whichhave many applications in military, mass spectroscopy and space applications. In thispaper, the working principles of helium magnetometers have been explained. There isalso an introduction of a new method for finding the resonant frequency, which hasadvantages to the typical method such as more sample r...

Introduction Hyperpolarized (HP) gas MRI in small animals is challenging and generally requires a dedicated ventilator system. Moreover, the use of expensive rare isotopes such as He and Xe make it desirable to minimize cost by recycling these gases after they have been used for imaging. We present a constantvolume ventilator that offers precise control of gas delivery, permits highresolution i...

Microscopic-level understanding of the separation mechanism for two-dimensional (2D) membranes is an active area research due to potential implications this class various technological processes. Helium (He) purification from natural resources particular interest shortfall in its production. In work, we applied ring polymer molecular dynamics (RPMD) method graphdiyne (Gr2) and graphtriyne (Gr3)...

  Introduction: Several studies have discussed to the electron contamination caused by the air column between the head of linac and patient for photon beams. Since it is not possible to measure the electron contamination with practical dosimetry, the Monte Carlo technique is an appropriate and accurate choice to calculate particle flounce in radiation therapy. The purpose of t...

Metastable atomic and molecular helium anions exhibiting high-spin quartet configurations can be produced in helium droplets via electron impact. Their lifetimes allow detection in mass spectrometric experiments. Formation of atomic helium anions comprises collision-induced excitation of ground state helium and concomitant electron capture. Yet the formation of molecular helium anions in helium...