scholarly journals The Use of Sustainability Principles and Lighting Technology in Lighting Hotels’ Lobby Area

Author(s):  
Sally El-Sayed ◽  
Mohamed Abed
2021 ◽  
Vol 13 (15) ◽  
pp. 8148
Author(s):  
Ciska Ulug ◽  
Lummina Horlings ◽  
Elen-Maarja Trell

Ecovillages are collective projects that attempt to integrate sustainability principles into daily community life, while also striving to be demonstration projects for mainstream society. As spaces of experimentation, they can provide valuable insights into sustainability transformations. Through shared values and interpersonal connections, ecovillages possess collective identities, which provide a platform for enacting their ideals. However, many ecovillage residents question how to best enhance their role as models, resource centers, and pieces of a greater movement toward sustainability transformations, while simultaneously preserving their unique community and identity. In relation to the above, this paper addresses the questions: What can collective identity in ecovillage communities teach us about the objective and subjective dimensions of sustainability transformations? Furthermore, how can the perspective of collective identity highlight challenges for ecovillages for initiating sustainability transformations? Sustainability transformations encompass objective (behaviors) and subjective (values) dimensions; however, the interactions between these spheres deserve more scholarly attention. Using ethnographic data and in-depth interviews from three ecovillages in the United States, this paper reveals the value in collective identity for underscoring belonging and interpersonal relationships in sustainability transformations. Furthermore, the collective identity perspective exposes paradoxes and frictions between ecovillages and the societal structures and systems they are embedded within.


Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3363
Author(s):  
Jolanta Latosińska ◽  
Maria Żygadło ◽  
Przemysław Czapik

Wastewater treatment processes produce sewage sludge (SS), which, in line with environmental sustainability principles, can be a valuable source of matter in the production of lightweight expanded clay aggregate (LECA). The literature on the influence of SS content and sintering temperature on the properties of LECA is scarce. This paper aims to statistically evaluate the effects of SS content and sintering temperature on LECA physical properties. Total porosity, pore volume, and apparent density were determined with the use of a density analyzer. A helium pycnometer was utilized to determine the specific density. Closed porosity was calculated. The test results demonstrated a statistically significant influence of the SS content on the specific density and water absorption of LECA. The sintering temperature had a significant effect on the specific density, apparent density, total porosity, closed porosity, total volume of pores, and water absorption. It was proved that a broad range of the SS content is admissible in the raw material mass for the production of LECA.


Author(s):  
Kai Zhang ◽  
Ningning Zhu ◽  
Mingming Zhang ◽  
Lei Wang ◽  
Jun Xing

Recently, the light-emitting diode (LED) has been considered as an energy-saving and environment-friendly lighting technology,which is ten times more energy efficient than conventional incandescent lights. As an emerging photoelectric material,...


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