Neste texto pretende-se mostrar o movimento de tráfego que circulou pela Estrada Ferro Central da Bahia, no período 1865 a 1902. A estrada ferro partia Cachoeira e São Félix para interior com linha principal dirigida Chapada Diamantina um ramal, Feira Santana. empresa foi organizada inici- ativa privada, mas, posteriormente, teve ser encampada pelo governo federal. Apesar das dificuldades finan...

The paper examines the kinetics of the electric field induced, first-order transition from the commensurate to the ferro-electric phase in thiourea (SC(NH2)2) at 170 K. The satellite reflection from the modulated phase, locked in with a wave vector q = 1/9b∗ disappears when the phase transition is induced by a static electric field Ec along the a-axis. In order to study the kinetics of the phas...

The interesting magnetic response of conventional ferro-colloid has proved extremely useful in a wide range of technical applications. Furthermore, the use of nano/micro- sized magnetic particles has proliferated cutting-edge medical research, such as drug targeting and hyperthermia. In order to diversify and improve the application of such systems, new avenues of functionality must be explored...

Multilayer systems with alternating layers of ferromagnets (FM) and antiferromagnets (AFM) [1] have been drawing a special attention. In experiments some interlayers are often wedge-shaped with a small divergence angle [2] and the interface has a stepped form with a large separation between steps. The presence of a step at the boundary of a layered AFM leads to local variation of the magnetic s...

A new method is described for determining in shales the amount of sulphides that dissolve in dilute hydrochloric acid. 1he samples are treated with hydrochloric acid under vacuum, and the hydrogen sulphide evolved is absorbed in potassium hydroxide and titrated with potassium _~'~ermanganate. The analytical results are expressed as FeS. INTRODUCTION During a study of the distribution of the sul...

12 Hydrogenetic ferromanganese crusts are iron-manganese oxide chemical 13 precipitates on the seafloor that grow over periods of tens of millions of years. Their 14 secular records of chemical, mineralogical, and textural variations are archives of deep15 sea environmental changes. However, environmental reconstruction requires reliable 16 high-resolution age dating. Earlier chronological meth...

There is renewed interest in the origin and makeup of ferromanganese nodules (FMNs), long known to soil mineralogists as unusual secondary minerals. However, new evidence suggests that microorganisms play a significant role in the generation of FMNs. The biogenic origin of nodules has remained elusive because until recently, little has been known about the overall microbial community structure ...

Based upon down core variations in OrMn ratio in sediment and in micronodules, Mn content, organic carbon and abundance of micronodules in two box cores from high and low sedimentation regions of the Bay of Bengal, 0–20 and 0–40 cm levels were identified as ‘‘Mn oxidation zone’’ in the western and the eastern regions of the bay. Despite similarity in bottom water O and organic carbon contents o...