Search Results (5)

This paper places La Casa de las Golondrinas, a Pre-Columbian rock image site, in its Kaqchikel Maya cultural context. This is an exploration of both the cultural situation of the paintings and the meaning of a selection of the images. A comparison of sacred locations in contemporary use in the Kaqchikel highlands to the prehistoric locations of La Casa de las Golondrinas reveals that the same features are present in both the contemporary and Pre-Columbian milieu. Further comparisons show that there is a concordance of themes in the Pre-Columbian rock art with those found in the Kaqchikel ethnographic studies. Some of the matters covered are portals to the spiritual world, mythological deities and other spiritual beings, sacrifice and ritual celebrations, and the quincunx, which defines the sacred world’s four corners and center. This paper discusses a variety of single images and image clusters pertaining to seasonal rituals and creation using ethnographic information by Kaqchikel Maya archaeological and cultural scholars, the Popul Vuh, and sources on Maya cosmology and art. Full article

Indoor agricultural offers efficient alternatives for intensive food production through automation technologies and controlled environments. Light plays a crucial role in plant development; however, photons captured by the crop are often wasted in empty spaces, resulting in low light efficiency and high energy costs. This research aims to simulate eight structural designs for an indoor lettuce crop, exploring different planting systems and light and culture bed combinations (static and mobile) to identify the most effective mechanism for light efficiency during crop growth. The simulations were carried out with spreadsheets based on applying formulas of yield in dry biomass per photosynthetic photons, lighting costs, harvest, and production. The results indicate that Circular Moving Light and Mobile Culture Bed with Quincunx Planting (CML-QM) and Circular Moving Light and Mobile Culture Bed with Linear Planting (CML-LPM) exhibit higher photon capture percentages (85% and 80%, respectively) and lower electricity consumption compared to static designs. The simulation results demonstrate the potential for significant improvements in photon capture and cost savings through optimized system designs. This investigation provides valuable insights for designing more efficient systems and reducing electricity consumption to enhance the capture of photosynthetic photons in indoor lettuce cultivation. Full article

This article traces the history of the medieval oasis city of Sijilmassa, southeastern Morocco, and that of its modern, continuation city of metropolitan Rissani in the Tafilalt region. Elements of mobility and transition are discussed in light of the prominent historical role of the urban settlement in Tafilalt in long-distance trans-Saharan trade infrastructure. These elements are developed with a focus on the region’s Jewish communities, their socio-spatial characteristics, the employed toponymy with respect to Sijilmassa, and the material culture. Within the material culture of Tafilalt’s Jewry until the 1950s and 1960s (that is, upon their dramatic emigration from Morocco, mostly to Israel), the article analyzes in an original manner their traditional marriage contracts (ketubah-s) as a textual and especially as an esthetic artifact. The analysis interprets the visual imagery that appears in these manuscripts—an imagery that corresponds with global Jewish symbols, with the vernacular architecture in the Tafilalt, and with wider regional, trans-Saharan conceptual motifs. Revealing the composite symbolic imagery and decoding the visual repertoire of the ketubah-s against the rich cultural histories of the pre-Sahara region—with affinity to both northern Morocco and sub-Saharan, “black”, Africa—necessitates an interdisciplinary approach. This study brings together area studies (of the Middle East and Africa), art histories (of architecture and built forms, artifacts, and manuscripts), cultural studies (critical intra-group relations between Arabs, Berbers and Jews), and human geography (forms of settlements and long-distance trade activity)—in a type of meeting that is quite uncommon in the relevant research literature. Its contribution lies in tracing the dissemination of ideas and material cultures among less researched groups (southeastern Jewry) and regions (pre-Saharan) in Morocco, through engaging a transdisciplinary lens that requires an intimate acquaintance with associated research historiographies. Full article

Aiming at the problems of high-power consumption and insufficient kneading and cutting of roughage in the total mixed ration mixer. In this paper, licorice stems were taken as experimental objects, the horizontal twin-shaft TMR mixer was used to carry out the experimental study. It should be as brief as possible and concise. Through the kneading and cutting process power analysis, determine the influencing factors of kneading and cutting power consumption. The auger speed, processing time and blade type were taken as experimental factors, with standard straw length rate and power consumption as indicators, Box–Behnken test with three factors and three levels was carried out, analysis of variance was performed on the test results, the results show that the significant effect of each factor on the standard grass length is processing time, blade type and auger speed in descending order. The significance of the influence on power consumption from large to small is auger speed, processing time and blade type. The response surface analysis and parameter optimization were carried out, the results show that the auger speed is 20 r/min, the processing time is 29 min, and the blade type is quincunx blade. At this time, the standard straw length was 82.634%; Power consumption 4525.815 kJ, TMR mixer performance reached the best. The results can provide a theoretical basis for the subsequent research and development of TMR mixer. Full article

In this paper, we generalize the family of Deslauriers–Dubuc’s interpolatory masks from dimension one to arbitrary dimensions with respect to the quincunx dilation matrices, thereby providing a family of quincunx fundamental refinable functions in arbitrary dimensions. We show that a family of unique quincunx interpolatory masks exists and such a family of masks is of real value and has the full-axis symmetry property. In dimension $d=2$ , we give the explicit form of such unique quincunx interpolatory masks, which implies the nonnegativity property of such a family of masks. Full article