use for each and every act of intercourse.4 The use of condoms is recommended for individuals who have multiple partners, who have a primary partner who is infected, or who have a partner whose serostatus is unknown,5 although the absolute amount of protection they provide has not been accurately established. The effectiveness of the condom as a contraceptive provides insight into its usefulnes...

ical—i.e., that a pregnant teenager who is still growing may be competing for nutrients with the fetus, or that pregnancy within two years after menarche increases the risk of preterm delivery.4 Psychological factors may also be involved, since many adolescent pregnancies are unplanned, unwanted or discovered late;5 a pregnant teenager may lack the emotional maturity to take responsibility for ...

INTRODUCTION The relationship between growth in population and consumption and common-pool resources, particularly those that are governed under common-property institutions, has been the subject of lively academic debate. Researchers have long dwelled upon the global demographic transition and its effect on land-tenure and inheritance practices in different regions of the world. Boserup postul...

misson on Ordovician Stratigraphy and in 2002 ratified by the International Commission on Stratigraphy as the GSSP of the Second (Upper) Stage of the Lower Ordovician, is located on the Hunneberg Mountain in southwestern Sweden. The stratigraphic succession represents an outer shelf environment near the Baltic Shield margin. The shale-dominated, biostratigraphically complete, richly fossilifero...

While lights are often described by their origin and orientation in computer graphics, lights in the real world have particular states of vibration because lights are electromagnetic waves. Such state of vibration is called polarization state. Although human eyes cannot detect polarization state, sometimes lights behave differently according to their polarization states, which may be detected b...

ABSTRACT: Let M be a compact oriented minimal hypersurface of the unit n-dimensional sphere S. In this paper we will point out that if the Ricci curvature of M is constant, then, we have that either Ric ≡ 1 andM is isometric to an equator or, n is odd,Ric ≡ n−3 n−2 andM is isometric to S n−1 2 ( √ 2 2 )×S n−1 2 ( √ 2 2 ). Next, we will prove that there exists a positive number ̄(n) such that if ...

1 General Hospital of Giannitsa, Greece 2 Department of Orthopaedic Surgery, “St Paul” General Hospital of Thessaloniki, Greece 3 SEGAS National Centre Sports and Exercise Medicine, Thessaloniki, Greece 4 Department of Neurosurgery, “G. Papanikolaou” General Hospital of Thessaloniki, Greece 5 Department of Orthopaedic Surgery, University of Ioannina, Greece 6 Centre Lead and Professor of Sports...

Recovery and reuse of materials is important for a circular economy. In recent years the recovery of critical metals from end-of-life products has received increased attention. Various streams, e.g. permanent magnets, nickel metal hydride batteries and fluorescent lamps are considered targets for the recovery of rare earth elements (REEs). The last can be a source of up to six different REEs: e...