(Table 1) Crystal sizes of measured samples from the Bush Hill region in the Gulf of Mexico and from ODP Leg 204 at the Hydrate Ridge offshore Oregon

The grain sizes of gas hydrate crystallites are largely unknown in natural samples. Single grains are hardly detectable with electron or optical microscopy. For the first time, we have used high-energy synchrotron diffraction to determine grain sizes of six natural gas hydrates retrieved from the Bush Hill region in the Gulf of Mexico and from ODP Leg 204 at the Hydrate Ridge offshore Oregon from varying depth between 1 and 101 metres below seafloor. High-energy synchrotron radiation provides high photon fluxes as well as high penetration depth and thus allows for investigation of bulk sediment samples. Gas hydrate grain sizes were measured at the Beam Line BW 5 at the HASYLAB/Hamburg. A 'moving area detector method', originally developed for material science applications, was used to obtain both spatial and orientation information about gas hydrate grains within the sample. The gas hydrate crystal sizes appeared to be (log-)normally distributed in the natural samples. All mean grain sizes lay in the range from 300 to 600 µm with a tendency for bigger grains to occur in greater depth. Laboratory-produced methane hydrate, aged for 3 weeks, showed half a log-normal curve with a mean grain size value of c. 40 µm. The grains appeared to be globular shaped.

The establishment of Maximilian's empire in Mexico.

Thesis (PH. D.)--University of Pennsylvania, 1912.

History of the conquest of Mexico : with a preliminary view of the ancient mexican civilization and the life of the conqueror Hernando Cortés /

Contiene: Vol. I -- Vol. II.

History of the conquest of Mexico : with a preliminary view of the ancient mexican civilization and the life of the conqueror Hernando Cortés /

Contiene: Vol. I (XXIV, 308 p., [1] h. map. pleg.) -- Vol. II (XIV, 305, [1] h. map. pleg.) -- Vol. III (XIV, 341 p.)

History of Frederick the Second, emperor of the Romans. From chronicles and documents published within the last ten years.

Mode of access: Internet.

Il menologio di Basilio II (cod. vaticano greco 1613).

1. Testo -- 2. Tavole.

A flora of North America : containing abridged descriptions of all the known indigenous and naturalized plants growing north of Mexico /

Includes indexes.

Posthumous works of Frederic II, King of Prussia.

"Translated from the French by Thomas Holcroft."

Recollections of a Russian diplomat; the suicide of monarchies (William II and Nicholas II)

Preface signed: L. W. Makovski.

I. Study of the sulphides of indium. II. Study of indium (III) chloride complexes by polarographic methods,

Mode of access: Internet.

The Emperor Nicholas II as I knew him /

Mode of access: Internet.

A catalog of the Coleoptera of America north of Mexico family : Cupesidae /

G.P.O. sales statement incorrect in publication.

The silva of North America; a description of the trees which grow naturally in North America exclusive of Mexico,

The drawings by Mr. Faxon have been engraved (v. 1-5 by Philibert and Eugène Picart) under the direction of A. Riocreux.

Evaluation of piezoelectric PVDF polymers for use in space environments. II. Effects of atomic oxygen and vacuum UV exposure

The effects of atomic oxygen (AO) and vacuum UV radiation simulating low Earth orbit conditions on two commercially available piezoelectric polymer films, poly(vinylidene fluoride) (PVDF) and poly(vinylidene fluoride-trifluoroethylene) P(VDF-TrFE), have been studied. Surface erosion and pattern development are significant for both polymers. Erosion yields were determined as 2.8 � 10�24 cm3/atom for PVDF and 2.5 � 10�24 cm3/atom for P(VDF-TrFE). The piezoelectric properties of the residual material of both polymers were largely unchanged after exposure, although a slight shift in the Curie transition of the P(VDF-TrFE) was observed. A lightly cross-linked network was formed in the copolymer presumably because of penetrating vacuum ultraviolet (VUV) radiation, while the homopolymer remained uncross-linked. These differences were attributed to varying degrees of crystallinity and potentially greater absorption, and hence damage, of VUV radiation in P(VDFTrFE) compared with PVDF.