Search results for "hell"
showing 10 items of 1035 documents
Mollusk carbonate thermal behaviour and its implications in understanding prehistoric fire events in shell middens
2018
Abstract Archaeological shell middens are particularly important for reconstructing prehistoric human subsistence strategies. However, very little is known about shellfish processing, especially when related to the use of fire for dietary and disposal purposes. To shed light on prehistoric food processing techniques, an experimental study was undertaken on modern gastropod shells (Phorcus lineatus). The shells were exposed to high temperatures (200–700 °C) to investigate subsequent mineralogy and macro- and microstructural changes. Afterwards, the three-pronged approach was applied to archaeological shells from Haua Fteah cave, Libya (Phorcus turbinatus) and from shell midden sites in the U…
Evidence for a Smooth Onset of Deformation in the Neutron-Rich Kr Isotopes
2012
The neutron-rich nuclei Kr94,96 were studied via projectile Coulomb excitation at the REX-ISOLDE facility at CERN. Level energies of the first excited 2 + states and their absolute E2 transition strengths to the ground state are determined and discussed in the context of the E(21+) and B(E2;21+→01+) systematics of the krypton chain. Contrary to previously published results no sudden onset of deformation is observed. This experimental result is supported by a new proton-neutron interacting boson model calculation based on the constrained Hartree-Fock-Bogoliubov approach using the microscopic Gogny-D1M energy density functional. © 2012 American Physical Society.
Spherical top data system (STDS) software for the simulation of spherical top spectra
1998
Abstract The Spherical Top Data System (STDS) software package for the simulation of spherical top spectra is presented. It consists of a single UNIX script with self-explanatory arguments allowing the non-expert user to calculate spectra from the results of the high resolution analyses performed over the recent decades on this type of molecules. More than one hundred parameter files are presently available including various band systems of 16 molecular species (among which methane is the most documented) and various types of calculations: rovibrational energy levels, i.r. absorption, Raman scattering and Stark coefficients. STDS is freely accessible by anonymous ftp at jupiter.u-bourgogne.…
Characterization of the 3D information of Calyptogena shells
2003
We propose in this paper an application of multiresolution analysis techniques to extract information contained in the growth increments of a bivalve mollusk called: Calyptogena . The first stage consists in extracting a range image of the mollusk’s shell using a 3-D scanner. Applying a multiresolution analysis enables us to localize precisely those growth increments by preserving relevant details. Moreover, interesting spatial and frequency properties of the multiresolution analysis underline information contained on the shell. Intra-individual variation and inter-individual variations are compared to assume some conclusions as for the ontogenetic evolution of the animal such as periodicit…
Nonlinear Optical Characterization of InP@ZnS Core-Shell Colloidal Quantum Dots Using 532 nm, 10 ns Pulses
2021
InP@ZnS core-shell colloidal quantum dots (CQDs) were synthesized and characterized using the z-scan technique. The nonlinear refraction and nonlinear absorption coefficients (γ = −2 × 10−12 cm2 W−1, β = 4 × 10−8 cm W−1) of these CQDs were determined using 10 ns, 532 nm pulses. The saturable absorption (β = −1.4 × 10−9 cm W−1, Isat = 3.7 × 108 W cm−2) in the 3.5 nm CQDs dominated at small intensities of the probe pulses (I ≤ 7 × 107 W cm−2) followed by reverse saturable absorption at higher laser intensities. We report the optical limiting studies using these CQDs showing the suppression of propagated nanosecond radiation in the intensity range of 8 × 107–2 × 109 W cm−2. The role of nonline…
Characterization of eggshell as limestone replacement and its influence on properties of modified cement
2022
Food industry is known to produce, as a side product, huge amounts of eggshell. “Green chemistry” is searching for efficient ways of recycling antropogenic waste materials including also eggshell which is composed mainly from calcium carbonate and small amount of protein membrane. It is challenging to apply powdered chicken eggshell in cement industry and replace natural limestone. The impact of organic component of eggshell on modified cement was not studied yet. In the current report experimental studies were performed on the impact of the added powdered chicken eggshell instead of limestone on cement properties. 10, 20, and 30% of powdered eggshell (by weight) was added to Portland cemen…
Random Lasing of Rhodamine 6G Solution Containing TiO2:Silica Core:Shell Nanoparticles
2012
High efficiency and low rate of photodegradation was obtained in a random laser suspending TiO2@Silica nanoparticles in ethanol solution of Rhodamine 6G. The TiO2 nanoparticles were coated with a silica shell prepared via Stober method.
Detrital zircon and micropalaeontological ages as new constraints for the lowermost tectonic unit (Talea Ori unit) of Crete, Greece
2007
The Talea Ori unit is the lowermost known tectonic unit of Crete and the most external part of the Hellenides. Its stratigraphy ranges from Late Carboniferous to Oligocene and outcrops of the lower part are only known in the Talea Ori mountains (central Crete). In this area, a black sandstone at the base of the Galinos Beds, thought to be the oldest formation, contains zircons which were dated using the single grain evaporation method. The majority of these grains yielded Late Carboniferous ages (Variscan), while a small group yielded Early Proterozoic ages. The age distribution of these zircons suggests that, at the Carboniferous–Permian boundary, not much of the older North Gondwanan base…
Le sculture da Alesa
2009
First publication of a group of ideal and iconic sculptures from the central area of Alesa, within the excavation edition of the agora, and of a Hellenistic sculpture from the main sanctuary
Philosophical thought of the School of the Sextii
2014
Around the first half century B.C. the first Roman school of philosophy arose, which was called School of Sextii. The known members of the School were: Quintus Sextius the Elder, founding father of the School, Sextius Niger, Quintus' son, who became scholarch of the School after his father's death, Sotion, Papirius Fabianus (both teachers of Seneca the Younger), Crassicius Pasicles, a grammarian, and Celsius Cornelius, an expert doctor. The School followed the footsteps of the Hellenistic schools, and similar to these, the pursuit of happiness was its purpose. The school of the Sextii had taken to heart that part of the philosophy called physical, characterizing itself mainly as a philosoph…