Lovo, rock images, and mythology in the Land of the Kongo

2018 ◽  
Vol 18 (1) ◽  
pp. 30-49 ◽  
Author(s):  
Geoffroy Heimlich ◽  
Jean-Loïc Le Quellec ◽  
Clément Mambu Nsangathi
Keyword(s):  
Rock Art ◽  
Atlantic Coast ◽  
Preliminary Research ◽  
Points Of View ◽  
Congo Brazzaville ◽  
Mythical Origin

In Kongo Central, rock art sites stretch from Kinshasa to the Atlantic coast and from northern Angola to southern Congo-Brazzaville. Preliminary research revealed one coherent entity situated north of the Kongo kingdom: the Lovo Massif, presently inhabited by the Ndibu, one of the Kongo subgroups. Comparison of the ethnological, historical, archaeological, and mythological points of view confirms that certain Kongo ritual and symbolic aspects are pre-Christian and refer to cosmogony, anthropogony, or narratives associated with the mythical origin of death. Investigating rock images allows us to better understand the link between the images, the myths, and their repercussions on the life of the Kongo today.

First Direct Radiocarbon Dating of the Lower Congo Rock Art (Democratic Republic of the Congo)

Radiocarbon ◽  
2013 ◽  
Vol 55 (3) ◽  
pp. 1383-1390 ◽  
Author(s):  
Geoffroy Heimlich ◽  
Pascale Richardin ◽  
Nathalie Gandolfo ◽  
Eric Laval ◽  
Michel Menu
Keyword(s):  
Radiocarbon Dating ◽  
Democratic Republic ◽  
Rock Art ◽  
Atlantic Coast ◽  
Central Africa ◽  
Entire Region ◽  
Republic Of The Congo ◽  
Congo Brazzaville ◽  
The 19Th Century ◽  
Real Challenge

Lower Congo rock art is concentrated in a region that stretches from Kinshasa to the Atlantic coast and from northern Angola to southern Congo-Brazzaville. Although Lower Congo rock art was identified as early as the 19th century, it had never been a subject of thorough investigation. Presently inhabited by the Ndibu, one of the Kongo subgroups, the Lovo Massif is situated north of the ancient Kongo Kingdom. With 102 sites (including 16 decorated caves), the massif has the largest concentration of rock art in the entire region. In 2008 and 2010, we were able to collect pigment samples directly on the panels of the newly discovered decorated cave of Tovo. Unlike the Sahara and southern Africa, both extensively prospected, rock art of central Africa is still widely unknown and not dated. Radiocarbon dating of rock art in Africa is a real challenge and only a few direct dates have been obtained thus far. After verifying that the pigment samples were indeed charcoal, we proceeded to 14C date them using accelerator mass spectrometry (AMS). The results indicate dates between cal AD 1480 and 1800, confirming that the occupation of Tovo Cave was contemporaneous with the ancient Kongo Kingdom.

scholarly journals Discarded Cathode Ray Tube Glass as an Alternative for Aggregate in a Metakaolin-Based Geopolymer

2021 ◽  
Vol 13 (2) ◽  
pp. 479
Author(s):  
Natalia Wielgus ◽  
Marcin Górski ◽  
Jan Kubica
Keyword(s):  
Compressive Strength ◽  
Room Temperature ◽  
Sodium Hydroxide Concentration ◽  
Factors Influencing ◽  
Cathode Ray Tube ◽  
Different Types ◽  
New Material ◽  
New Type ◽  
Preliminary Research ◽  
Points Of View

Cathode Ray Tube (CRT) glass belongs to the group of wastes which are hard to be recycled due to their toxic metals content. Geopolymers are relatively new environmentally friendly materials which allow for the use of different types of wastes within their matrix. The following paper combines both issues and presents a new geopolymer mixture containing discarded CRT glass as a replacement for an aggregate. The main goal of the paper is to describe the basic mechanical behavior of the new type of metakaolin-based geopolymer and to discuss different factors influencing it. After the preliminary research, the mixture containing 50% of CRT glass was chosen for further tests. However, according to results, CRT glass content has no evident influence on flexural or compressive strength. Summarizing the second part of the research, it was decided that the following parameters are optimal from the mechanical, economic and environmental points of view: metakaolin to CRT glass ratio 1:1 (by mass), CRT glass of size up to 4 mm, curing at the room temperature, sodium hydroxide concentration 10 mol/L. According to the authors, the presented geopolymer is a promising building material. Further tests shall be done to describe new material more precisely.

High Resolution Specimen Area Imaged Under Negligible Field Aberrations

1970 ◽  
Vol 28 ◽  
pp. 540-541 ◽  
Author(s):  
T. Yanaka ◽  
K. Shirota
Keyword(s):  
High Resolution ◽  
Field Distribution ◽  
Image Space ◽  
Beam Deflection ◽  
Objective Lens ◽  
Resolution Limit ◽  
Leakage Flux ◽  
Specimen Area ◽  
Points Of View ◽  
Aberration Theory

It is significant to note field aberrations (chromatic field aberration, coma, astigmatism and blurring due to curvature of field, defined by Glaser's aberration theory relative to the Blenden Freien System) of the objective lens in connection with the following three points of view; field aberrations increase as the resolution of the axial point improves by increasing the lens excitation (k2) and decreasing the half width value (d) of the axial lens field distribution; when one or all of the imaging lenses have axial imperfections such as beam deflection in image space by the asymmetrical magnetic leakage flux, the apparent axial point has field aberrations which prevent the theoretical resolution limit from being obtained.

Crystal structure images of large gold clusters and growing crystals by HRTEM

1984 ◽  
Vol 42 ◽  
pp. 428-429
Author(s):  
L.R. Wallenberg ◽  
J.-O. Bovin ◽  
G. Schmid
Keyword(s):  
Crystal Structure ◽  
Nucleation And Growth ◽  
Close Packing ◽  
Gold Clusters ◽  
Molecular Weight Determination ◽  
Growth Mechanisms ◽  
Starting Point ◽  
Different Types ◽  
Nucleation And Growth Mechanisms ◽  
Points Of View

Metallic clusters are interesting from various points of view, e.g. as a mean of spreading expensive catalysts on a support, or following heterogeneous and homogeneous catalytic events. It is also possible to study nucleation and growth mechanisms for crystals with the cluster as known starting point.Gold-clusters containing 55 atoms were manufactured by reducing (C6H5)3PAuCl with B2H6 in benzene. The chemical composition was found to be Au9.2[P(C6H5)3]2Cl. Molecular-weight determination by means of an ultracentrifuge gave the formula Au55[P(C6H5)3]Cl6 A model was proposed from Mössbauer spectra by Schmid et al. with cubic close-packing of the 55 gold atoms in a cubeoctahedron as shown in Fig 1. The cluster is almost completely isolated from the surroundings by the twelve triphenylphosphane groups situated in each corner, and the chlorine atoms on the centre of the 3x3 square surfaces. This gives four groups of gold atoms, depending on the different types of surrounding.

Preliminary research of the aldosterone synthesized by bone morrow stem cells of adult male ratsin vitro

2010 ◽  
Vol 34 (8) ◽  
pp. S43-S43
Author(s):  
Wei‑ying Zou ◽  
Bei Yang ◽  
Xiuli Ni ◽  
Da‑lei Zhang ◽  
Lei Wu ◽  
...  
Keyword(s):  
Stem Cells ◽  
Adult Male ◽  
Preliminary Research ◽  
Bone Morrow

مشروعية نكاح المتعة عند الإمامية الإثنى عشرية وموقف المذاهب الإسلامية منها

2019 ◽  
Vol 7 (2) ◽  
Author(s):  
fithriah wardi
Keyword(s):  
Analytical Methods ◽  
Points Of View

Both fuqaha (Moslem jurists) of the Sunni and the Shi’ah are in agreement that Mut’ah marriage was permitted at the beginning of Islam, based on Al-quran verses and Rasulullah (pbuh) hadiths. However, they disagree as to the annulment and permissibility. The Shi’as considered Mut’ah marriage as permitted until the Day of Resurrection, meanwhile the Sunni viewed it as forbidden. The execution of Mut’ah marriage has always been singled out as one of the specific features of the Shi’ite doctrine in which denying it means denial of the religion. They also believe that woman who practised Mut’ah marriage will result in her sins being forgiven. According to the Shi’ites, Mut’ah marriage is one of the biggest reasons for someone to be granted heaven, and his status be elevated to the rank of the Holy Prophet PBUH. Hence, it can be said that practicing Mut’ah marriage is one of the most crucial issues among the Shi’ite community which is totally contradicted to the Sunni doctrine which believed it is unlawful marriage and equalized to Zina (adultery). There is no doubt that this is one of the most important topics that lead to the dispute between the two schools of thought. Using the descriptive and analytical methods, this study aims to elaborate the views on the issue from Shi’ite and Sunni points of view based on various proofs (adillah) and their argumentations in supporting the views.

An Immanent Criticism of Urban Design in Montevideo

2019 ◽  
Vol 2 (1) ◽  
Author(s):  
Washington MORALES
Keyword(s):  
Urban Design ◽  
Applied Ethics ◽  
Form Of Life ◽  
Political Reality ◽  
Applied Philosophy ◽  
Points Of View ◽  
Philosophical Frameworks

The debate about the so called “excluding design” has been a focus for applied philosophy for several years. The structure of this debate is constituted by deontological and consequentialist’s applied ethics and as well as agonistic democratic approaches. This paper asks for the applicability of these points of view to the particular socio-political reality of Montevideo. Examining this reality closer, I hold that we cannot comprehend the recent aestheticization of the excluding design there through these contemporary philosophical frameworks. As an alternative philosophical procedure, I analyze the aestheticization of excluding design in Montevideo from Rahel Jaeggi’s immanent criticism. I hold that this process of aestheticization implies an ideological regressive “form of life”. And I also argue that the Uruguayan democracy is affected by this ideological regression. Nevertheless, because this aestheticization is not an exclusive Uruguayan phenomenon, this paper intends to open one direction in applied philosophy of urban design.

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