Cur r en t knowledge of t he a t m o s p h e r e of U r a n u s is rev iewed a n d specific ob jec t ives are sugges ted for sa te l l i te miss ions to U r a n u s . The a n o m a l o u s compos i t ion of U r a n u s m a k e s d e t e r m i n a t i o n s of i ts a t m o s p h e r i c compos i t i on pa r t i cu l a r ly va luab le for t e s t i n g theor ies of solar s y s t e m evolu t ion ....

Jupiter has half a dozen eastward jet streams in each hemisphere. On average, Earth has only one in each hemisphere. Jupiter has weather patterns (“storms”) that last for centuries. Earth has stationary weather patterns fixed to the topography, but the average lifetime of a traveling storm is ∼1 week. Jupiter has no topography, i.e., no continents or oceans; its atmosphere merges smoothly with ...

While ceramic-to-metal bonding has been used in many applications, the actual chemical and physical factors leading to optimum bond strength are not well understood. In this work, several variables affecting the bonding between dental porcelain and a palladium alloy (85% Pd, 10% Cu, and 5% Ga) were investigated: 1) precoating the metal by sputtering various oxides before porcelaining; 2) peroxi...

Hypersonic aerothermodynamics for a probe entering a planetary atmosphere is an important issue in space exploration. The probe experiences various Knudsen number regimes, ranging from rarefied to continuum, due to density variation in the planet’s atmosphere. To simulate such multiscale flows, a novel hybrid particle scheme is employed in the present work. The hybrid particle scheme employs th...

On the base of high-resolution spectra and standard model atmosphere analyses we propose to employ the pressurebroadenedMg Ib lines to derive the gravity parameter for F and G stars. These lines are advocated to be a much more robust and reliable tracer compared to the ionization equilibrium of, say, Fe I/Fe II, which is susceptible to overionization effects and uncertainties in the temperature...

Tetrahedrane is most strained and the smallest cage compound. It attracts organic chemists because ofits unusual bonding nature and highly symmetrical structure. However, many efforts to isolate theparent tetrahedrane have been unsuccessful because of the high reactivity and very short lifetimecaused by the strain in this molecule. Modeling of molecules for determination of structuralproperties...

This paper proposes a structure and control approach for the energy saving servo control of a pneumatic servo system. The energy saving approach is enabled by supplementing a standard four-way spool valve controlled pneumatic actuator with an additional two-way valve that enables flow between the cylinder chambers. The “crossflow” valve enables recirculation of pressurized air, and thus enables...

The neutrino energy emission rate due to formation of Cooper pairs of neutrons and protons in the superfluid cores of neutron stars is studied. The cases of singlet-state pairing with isotropic superfluid gap and triplet-state pairing with anisotropic gap are analysed. The neutrino emission due to the singlet-state pairing of protons is found to be greatly suppressed with respect to the cases o...

The Role of Educational Administrators in Creating a Moral Atmosphere and Social Support, and its Relation with Organizational Performance S. Dehghaan Marvasti To explore the role of educational administrators in creating a moral atmosphere and social support and its relation with organizational performance, a random sample of 160 teachers from two districts in Yazd was given a set of...