Results 41 to 50 of about 1,244,399 (202)

Lithics of the North African Middle Stone Age: assumptions, evidence and future directions

open access: yes, 2019
North Africa features some of the earliest manifestations of the Middle Stone Age (MSA) and fossils of our species, Homo sapiens, as well as early examples of complex culture and the long distance transfer of exotic raw materials.
Scerri, E., Spinapolica, E.
core   +1 more source

Microblade Technology in Quartz during the Mesolithic in Eastern Middle Sweden

open access: yesCurrent Swedish Archaeology, 2008
Thc authors present a material that has previously not been given much attcntion : microblades and microblade cores of quartz from eastern middle Sweden. The focus is on the technology. core types, geographical distribution and dating. The debate on how
Fredrik Molin, Roger Wikell
doaj   +1 more source

The Environmental Safety Aspects of Technologically Powerful Materials Are Often Overlooked

open access: yesProceedings, 2023
Novel materials and their combinations are the basis of societal progress: stone—Stone Age; bronze—Bronze Age; iron—Iron Age [...]
Anne Kahru   +7 more
doaj   +1 more source

Characterization of the noble gases and CRE age of the D'Orbigny angrite [PDF]

open access: yes, 2002
Introduction: The D’Orbigny angrite, a 16.55 kg stone, was found 1979 in Argentina [1]. Mineralogy and chemistry of this meteorite were characterized in detail [2-6]. A Pb-U-Th age of 4.559 Ga was obtained for pyroxenes by Jagoutz et al. [7].
Busemann, H.   +4 more
core  

A Sketch of Two and Three Bodies

open access: yes, 1999
A cartoon of the Effective Field Theory of many nucleon systems is drawn, concentrating on Compton scattering in the two nucleon system, and on $nd$ scattering in the three body system.Comment: 11 pages (stone-age) LaTeX with 7 figures, uses packages ...
Griesshammer, Harald W.
core   +2 more sources

Influence of Age and Geography on Chemical Composition of 98043 Urinary Stones from the USA

open access: yesEuropean Urology Open Science, 2021
Background: Urolithiasis is a growing issue globally, but it is heterogeneous, with a different epidemiology and pathophysiology for each different stone composition.
Jonathan E. Katz   +7 more
doaj   +1 more source

Renal function assessment in adults with recurrent calcium kidney stone disease [PDF]

open access: yes, 2012
The prevalence of nephrolihiasis and chronic kidney disease has risen over the past three decades, we sought to determine if person with a history of kidney stones have lower renal function relative to non stone formers.
Milladipour, Amir Hossein   +1 more
core   +1 more source

Should "The Stone Age" Be Called "The Stone And Basket Age?"

open access: yes, 2023
A complete, fully illustrated, tentative theory about the million(s?) year evolution of basket weaving and woven-fiber technology that was crucial for the development of civilization. It includes extensive documentation.
openaire   +1 more source

The building stones and slates of Killin : an investigation of stone for the built heritage [PDF]

open access: yes, 2010
The village of Killin lies in an area of dramatic landscape and mountain scenery. The use of local stone in the buildings gives a direct connection to this landscape and reflects the local geology, comprising mostly metamorphic rocks of Precambrian age
Albornoz-Parra, L.J.   +5 more
core  

Age of onset and course of urinary stone are related with renal function damage [PDF]

open access: yesJichu yixue yu linchuang, 2020
Objective To evaluate the correlation of age of onset, course of stone with renal function among urinary stone patients. Methods Totally 183 patients' history data were reviewed, including age of onset for stone, course of stone and eGFR.
QIAO Yi, XIAO He, FAN Xiao-hong, SHI Bing-bing, JI Zhi-gang, LI Han-zhong
doaj  

Home - About - Disclaimer - Privacy