Arqueología de rescate oleoducto Vasconia-Coveñas Un viaje por el tiempo a lo largo del oleoducto. Cazadores-recolectores, agroalfareros y orfebres.

Arqueología de rescate oleoducto Vasconia-Coveñas Un viaje por el tiempo a lo largo del oleoducto. Cazadores-recolectores, agroalfareros y orfebres. ALVARO BOTTVA ET AL. OLEODUCTO DE COLOMBIA S.A. E ICAN (ED.) Bogorá, 1994. En el libro colectivo publicado por Oleoducto de Colombia y el ICAN como resultado del trabajo de arqueología de rescate a lo largo del oleoducto Vasconia-Coveñas, se reseñan sesenta y siete sitios arqueológicos localizados en diferentes ambientes ecosistémicos, para algunos de los cuales se obtuvieron fechas alrededor del 10.400 BP (Magdalena medio) y 970 BP (sabanas de Córdova). Sin embargo en la presente reseña se hará énfasis en la forma de abordar la investigación, teniendo en cuenta que en los últimos años los estudios arqueológicos han encontrado en la “arqueología de rescate", una forma particular de asumir la investigación en esta área. &nbsp

Global Journalist: Reporters on the Iraq War

This Global Journalist show from April 3, 2003 features several journalists discussing how they view the recent progress of the American and British forces in the Iraq war. Jennifer Hamarneh, at the time the editor-in-chief of The Jordan Times, talks about hearing from Matthew McAllester, a reporter who was held captive in Iraq for over a week. Host: Stuart Loory. Guests: Jennifer Hamarneh (Jordan), Reinhard Meier (Switzerland), Edward Lucas (London), Dan Sneider (California). Producers: Sara Andrea Fajardo, Augustine Pang. Director: Pat Akers

Asentamientos prehispánicos en el bajo río Sinú y sur de la Serranía de San Jerónimo

Con el objetivo, a largo plazo, de conocer la dinámica cultural prehispánica en la región limítrofe de tres microambientes diferentes (la Ciénaga Grande, las estribaciones del sur de la serranía de San Jerónimo y las sabanas intermedias), realizamos en 1994-95 una investigación en el norte del departamento de Córdoba, en jurisdicción de los municipios de Chimá y San Andrés de Sotavento, zona que incluye el resguardo indígena Zenú del mismo nombre. Inicialmente se desarrolló un estudio de asentamientos que compromete, además de los patrones de ocupación, el manejo de espacios y la utilización de recursos

Coherent Stranski-Krastanov growth in 1+1 dimensions with anharmonic interactions: An equilibrium study

The formation of coherently strained three-dimensional islands on top of the wetting layer in Stranski-Krastanov mode of growth is considered in a model in 1+1 dimensions accounting for the anharmonicity and non-convexity of the real interatomic forces. It is shown that coherent 3D islands can be expected to form in compressed rather than in expanded overlayers beyond a critical lattice misfit. In the latter case the classical Stranski-Krastanov growth is expected to occur because the misfit dislocations can become energetically favored at smaller island sizes. The thermodynamic reason for coherent 3D islanding is the incomplete wetting owing to the weaker adhesion of the edge atoms. Monolayer height islands with a critical size appear as necessary precursors of the 3D islands. The latter explains the experimentally observed narrow size distribution of the 3D islands. The 2D-3D transformation takes place by consecutive rearrangements of mono- to bilayer, bi- to trilayer islands, etc., after exceeding the corresponding critical sizes. The rearrangements are initiated by nucleation events each next one requiring to overcome a lower energetic barrier. The model is in good qualitative agreement with available experimental observations.Comment: 12 pages text, 15 figures, Accepted in Phys.Rev.B, Vol.61, No2

Strategic Management: a Methodological Approach

xiv, 939 hlm.; Ind.; 26 c

Thalamic Gamma Aminobutyric Acid Level Changes in Major Depressive Disorder After a 12-Week Iyengar Yoga and Coherent Breathing Intervention

Objective: To determine if a 12-week yoga intervention (YI) was associated with increased gamma aminobutyric acid (GABA) levels and decreased depressive symptoms in participants with major depressive disorder (MDD). Methods: Subjects were randomized to a high-dose group (HDG) of three YIs a week and a low-dose group (LDG) of two YIs a week. Thalamic GABA levels were obtained using magnetic resonance spectroscopy at Scan-1 before randomization. After the assigned 12-week intervention, Scan-2 was obtained, immediately followed by a YI and Scan-3. Beck Depression Inventory II (BDI-II) scores were obtained before Scan-1 and Scan-3. Settings/Location: Screenings and interventions occurred at the Boston University Medical Center. Imaging occurred at McLean Hospital. Subjects: Subjects met criteria for MDD. Intervention: Ninety minutes of Iyengar yoga and coherent breathing at five breaths per minute plus homework. Outcome measures: GABA levels and the BDI-II. Results: BDI-II scores improved significantly in both groups. GABA levels from Scan-1 to Scan-3 and from Scan-2 to Scan-3 were significantly increased in the LDG (n = 15) and showed a trend in the total cohort. Post hoc, participants were divided into two groups based on having an increase in GABA levels at Scan-2. Increases in Scan-2 GABA levels were observed in participants whose mean time between their last YI and Scan-2 was 3.93 ± 2.92 standard deviation (SD) days, but not in those whose mean time between their last YI and Scan-2 was 7.83 ± 6.88 SD. Conclusions: This study tentatively supports the hypothesis that one of the mechanisms through which yoga improves mood is by increasing the activity of the GABA system. The observed increase in GABA levels following a YI that was no longer observed 8 days after a YI suggests that the associated increase in GABA after a YI is time limited such that at least one YI a week may be necessary to maintain the elevated GABA levels