Search results for "Cycling"

Crypthecodinium cohnii Growth and Omega Fatty Acid Production in Mediums Supplemented with Extract from Recycled Biomass

2022

Crypthecodinium cohnii is a marine heterotrophic dinoflagellate that can accumulate high amounts of omega-3 polyunsaturated fatty acids (PUFAs), and thus has the potential to replace conventional PUFAs production with eco-friendlier technology. So far, C. cohnii cultivation has been mainly carried out with the use of yeast extract (YE) as a nitrogen source. In the present study, alternative carbon and nitrogen sources were studied: the extraction ethanol (EE), remaining after lipid extraction, as a carbon source, and dinoflagellate extract (DE) from recycled algae biomass C. cohnii as a source of carbon, nitrogen, and vitamins. In mediums with glucose and DE, the highest specific biomass gr…

Quarry Limestone Dust as Fine Aggregate for Concrete

2018

In quarrying activities, rock is extracted and transformed into aggregate of various sizes for civil engineering applications. In this process waste, fine aggregates is generated. The disposal of this type of waste is a further cost in the extraction process, but also a possible cause of environmental degradation and pollution (e.g. leaching into water reserves, atmospheric pollution as a result of small particles causing respiratory diseases or deposited on plants disrupting photosynthesis, affecting aquatic habitats, etc.). A strategy for the effective recycling of quarry dust, not only reduces waste generation and disposal but also addressed protection of the environment. The Italian qua…

A retrospective international study on factors associated with injury, discomfort and pain perception among cyclists

2019

International audience; Although cycling has been associated with overuse/fatigue and acute injuries, there is lack of information regarding associated risk factors and prevention factors. The objective of the study was to determine the factors associated with injury, and perceptions of discomfort and pain in cyclists. A total of 739 cyclists completed an online questionnaire between February and October 2016. The questionnaire acquired information on participant demographics, characteristics related to cycling profile and fitness training, bike components and cycling posture, self-reported perceptions of comfort and pain, and injuries sustained in the last 12 months. Logistic regression mo…

From Buildings' End of Life to Aggregate Recycling under a Circular Economic Perspective: A Comparative Life Cycle Assessment Case Study

2021

The demolition of buildings, apart from being energy intensive and disruptive, inevitably produces construction and demolition waste (C&Dw). Unfortunately, even today, the majority of this waste ends up underexploited and not considered as valuable resources to be re-circulated into a closed/open loop process under the umbrella of circular economy (CE). Considering the amount of virgin aggregates needed in civil engineering applications, C&Dw can act as sustainable catalyst towards the preservation of natural resources and the shift towards a CE. This study completes current research by presenting a life cycle inventory compilation and life cycle assessment case study of two buildin…

Long-Term Stability of (Ti/Zr/Hf)CoSb1−xSnxThermoelectric p-Type Half-Heusler Compounds Upon Thermal Cycling

2015

The effect of thermal cycling upon the thermoelectric performance of state-of-the-art p-type half-Heusler materials was investigated and correlated with the impact on the structural properties. We simulated a heat treatment of the material similar to actual applications in the mid-temperature range, such as occurs during the energy conversion from an automotive exhaust pipe. We compared three different compositions based on the (Ti/Zr/Hf)CoSb1−xSnx system. The best and most reliable performance was achieved using Ti0.5Hf0.5CoSb0.85Sn0.15, which reached a maximum figure of merit ZT of 1.1 at 700 °C. The intrinsic phase separation and resulting microstructuring, which are responsible for the …

Reconstitution of vesicular transport to Rab11-positive recycling endosomes in vitro.

2003

Rab GTPases are key regulators of vesicular protein transport in both the endocytic and exocytic pathways. In endocytosis and recycling, Rab11 plays a role in receptor recycling to plasma membrane via the pericentriolar recycling compartment. However, little is known about the molecular requirements and partners that promote transport through Rab11-positive recycling endosomes. Here, we report a novel approach to reconstitute transport to immunoabsorbed recycling endosomes in vitro. We show that transport is temperature-, energy-, and time-dependent and requires the presence of Rab proteins, as it is inhibited by the Rab-interacting protein Rab GDP-dissociation inhibitor that removes Rab pr…

Economía informal, chatarreo y marco social : reflexiones a partir del caso de los gitanos rumanos en Valencia (España)

2023

Este artículo aborda el chatarreo y otras actividades económicas informales realizadas por los gitanos rumanos en Valencia, con un triple objetivo. Uno, analizar el chatarreo como actividad económica informal de reciclaje y las estrategias y los recursos utilizados. Dos, captar las implicaciones del chatarreo y de su valoración social en la situación del colectivo. Tres, conocer los principales factores que establecen diferencias entre la situación en Valencia y otras ciudades europeas occidentales, con algunas poblaciones del sur global con experiencias más positivas para los recicladores informales. Basado en una metodología cualitativa, con trabajo de campo realizado entre septiembre de …

Design and development of a new machine tool for continuous friction stir extrusion

2023

In the present paper the Continuous Friction Stir Extrusion process (CFSE), derived from the already known Friction Stir Extrusion (FSE), is proposed for effective solid-state recycling of metal scraps. A new dedicated machine tool was designed and developed. A Lagrangian implicit thermomechanical numerical model was set up and used to determine the proper ranges of the most relevant process parameters. An effective case study is proposed, involving the actual extrusion of a recycled wire in a continuous way. Metallurgical observations and mechanical characterization tests were carried out on the obtained specimen showing the potential of the process and its industrial feasibility.(c) 2023 …

Preparation and Recycling of Plasticized PLA

2011

Breaking the siege. From the paleo- to the neo-anthropocene

2017

Il contributo descrive in che modo e con quali strumenti di progetto, la città può essere ripensata alla luce della presa di coscienza della rilevanza della Città e dell'Uomo nell'evoluzione del Pianeta. I punti posti in attenzione sono: la costruzione di nuovi cicli vitali per la città, la rilevanza del tempo, la definizione di nuove priorità di intervento, l'uso degli scarti. The paper describes how and with what project tools the city can be re-thought in the light of the awareness of the importance of the City and of Man in the evolution of the Planet. The points of attention are: 1. building new life cycles for the city as a new way of designing the future of our cities and not just as…