Background: This paper aimed to analyze the output constancy of a medical linear accelerator using PTW QUICKCHECKwebline and studied the sensitivity of the PTW QUICKCHECKwebline. Materials and Methods:  The paper statistically analyzed the output doses of 6 MV and 10 MV of photons and 6 MeV, 9 MeV, and 12 MeV of electrons from a medical linear accelerator measured before the daily treatment to ...

In the title compound, [CdI(2)(C(14)H(12)N(2))], the mol-ecule sits on a crystallographic twofold axis. The coordination sphere of the Cd(II) atom is built of two symmetry-equivalent N atoms of one 2,9-dimethyl-1,10-phenanthroline (dmphen) ligand and two symmetry-equivalent I atoms, thus forming a distorted tetra-hedral geometry. Inversion-related mol-ecules inter-act along the c-axis direction...

Visual interpolation between dots responsible for rectilinear versus curvilinear contour interpretation was examined with the psychophysical forced directional response (FDR) paradigm. Regular four-dot polygon segments, together with a target dot, were presented to the subjects for 150 ms. Subjects were required to indicate the direction of deviation of the target dot from the midpoint of the i...

Crystals of rubredoxin oxygen oxidoreductase have been obtained and characterized. They belong to space group P2(1)2(1)2, with unit-cell dimensions a = 88.24 (15), b = 101.25 (7), c = 90.80 (3) A. The homodimer (86 kDa) in the asymmetric unit is related by a non-crystallographic twofold rotation axis parallel to the ab 'diagonal' direction, as shown by the self-rotation maximum in the section w...

The title complex, [Cd(C(14)H(11)N(2)O(4))(2)(C(5)H(5)N)(2)], exhibits crystallographic twofold symmetry. The Cd(II) atom is located on the twofold rotation axis and reveals a slightly distorted octa-hedral coordination defined by four atoms (N(2)O(2)) from two symmetry-related chelate ligands and two pyridine N atoms. Intra-molecular O-H⋯O and N-H⋯O hydrogen bonds stabilize the mol-ecular conf...

A novel approach is proposed for the attitude stabilization and reorientation of an axi-symmetric spacecraft subject to two gas jet actuators. The approach is based on a new formulation of the attitude kinematics. Abstract| In this paper we consider the problem of attitude stabilization of an axi-symmetric spacecraft using two pairs of gas jet actuators. These actuators provide control torques ...

The formation of a hollow cellular sphere is often one of the first steps of multicellular embryonic development. In the case of Hydra, the sphere breaks its initial symmetry to form a foot-head axis. During this process a gene, ks1, is increasingly expressed in localized cell domains whose size distribution becomes scale-free at the axis-locking moment. We show that a physical model based sole...

The title compound, [Cu(C(7)H(5)ClNO)(2)]·2CH(3)OH, possesses crystallographic twofold symmetry, with the twofold axis passing through the central Cu(II) ion. The metal centre is coordinated by two O atoms and two N atoms from two symmetry-related Schiff base ligands, forming a slightly distorted cis-CuN(2)O(2) square-planar geometry. The complex mol-ecules are linked via the solvent methanol m...

The magnetic field of a permanent magnet is calculated analytically for different geometries. The cases of a sphere, cone, cylinder, ring and rectangular prism are studied. The calculation on the axis of symmetry is presented in every case. For magnets with cylindrical symmetry, we propose an approach based on an expansion in Legendre polynomials to obtain the field at points off the axis. The ...

In this paper, we consider the minimum-time reorientation problem of an axi-symmetric rigid spacecraft with two independent control torques mounted perpendicular to the spacecraft symmetry axis. The spacecraft is allowed to spin about its symmetry axis. All possible control structures, including both singular and nonsingular arcs, are studied completely by deriving the corresponding formulae, a...