Search results for "PAV"

A Comparison of Solar and Conventional Pavements Via Life Cycle Assessment

2023

The sustainable and green development of roads is lately receiving significant attention. As a multi-functional road capable of both accommodating traffic loads and generating clean energy, solar pavements exhibit a strategic opportunity for the future path of development in the road engineering. Although solar pavements have significant environmental benefits during their operation, they can lead to increased carbon emissions during the process of material preparation, construction, maintenance, etc. Therefore, it is essential to implement the framework of Life Cycle Assessment (LCA) to investigate their potential environmental impacts and/or benefits. Hence, this paper systematically anal…

Zvaigžņotā Debess: 2017/18, Ziema (238)

2017

Contents: “ZVAIGŽŅOTĀ DEBESS” FORTY YEARS AGO: I.Vilka. Starry Sky and Birds’ Journeys (abridged) ; N.Cimahoviča. Spirals of Saturn’s Rings (abridged) ; I.Šmelds. V Readings of Friedrich Zander ; DEVELOPMENTS in SCIENCE: K.Schwartz. Most Distant Galaxy Clusters and 3D Structure of the Universe ; DISCOVERIES: M.Gills. The Day when Multi-Messenger Astronomy Was Announced ; I.Pundure. ESO Telescopes and Hubble Observe the Source of Gravitational Waves for the First Time ; I.Eglītis. Asteroid “Balklavs” ; SPACE RESEARCH and EXPLORATION: R.Misa. Mission of Cassini – Discoveries to the Very End ; J.Jaunbergs. The Icy World Tethys ; OBSERVATORIES and INSTRUMENTS: M.Gills. The Giant Radio Telescope…

Prediction of Airport Pavement Moduli by Machine Learning Methodology Using Non-destructive Field Testing Data Augmentation

2022

For the purpose of the Airport Pavement Management System (APMS), in order to optimize the maintenance strategies, it is fundamental monitoring the pavement conditions’ deterioration with time. In this way, the most damaged areas can be detected and intervention can be prioritized. The conventional approach consists in performing non-destructive tests by means of a Heavy Weight Deflectometer (HWD). This equipment allows the measurement of the pavement deflections induced by a defined impact load. This is a quite expensive and time-consuming procedure, therefore, the points to be investigated are usually limited to the center points of a very large mesh grid. Starting from the measured defle…

Mājas strazda Sturnus vulgaris pavasara atlidošanas fenoloģijas izmaiņas Ziemeļaustrumeiropā laika posmā no 1922. līdz 2017. gadam

2021

Pētījumā analizētas mājas strazda Sturnus vulgaris pavasara atlidošanas fenoloģijas pārmaiņas Ziemeļaustrumeiropā laika periodā no 1922. līdz 2017. g. un to saistība ar izmaiņām meteoroloģiskā pavasara iestāšanās laikā. Mājas strazdu pavasara atlidošanas laiks būtiski korelē ar pavasara iestāšanos, un periodā no 1922. līdz 2017. g. tas ir kļuvis vidēji par 12 dienām agrāks. Tomēr pārmaiņas pavasara iestāšanās laikā notiek vēl straujāk – tam, pētījumā aplūkotajā periodā, kļūstot vidēji par 27 dienām agrākam. Tādējādi apstiprinās izvirzītā hipotēze, ka gaisa temperatūras pieauguma ietekmē, mājas strazdu pavasara atlidošanas fenoloģija Ziemeļaustrumeiropā pēdējā gadsimta laikā ir kļuvusi būtis…

Effect of Intra-Arterial Infusion of Papaverine Hydrochloride on Brain Tissue Oxygen Pressure in the Management of Severe Vasospasm Following Aneurys…

2001

Despite considerable advances in diagnostic, surgical and interventional techniques, the overall outcome for patients with aneurysmal subarachnoid hemorrhage remains poor. Concerning perioperative course, cerebral ischaemia is one of the major factors causing secondary brain demage. The aim of all therapeutic interventions is the stabilization and maintance of cerebral blood flow and tissue oxygenation in order to prevent cerebral ischaemia and consecutively brain infarction [1].

The way forward for pavement performance indicators across Europe - Final Report COST Action 354

2008

UN APPROCCIO BASATO SULLA MODELLAZIONE 3D E IL LIFE CYCLE ASSESSMENT PER UNA GESTIONE SOSTENIBILE DELLA MANUTENZIONE STRADALE

2021

Among several goals of the road agencies, one of the most relevant is the maintenance and rehabilitation of the road pavement. The growth of traffic, the longstanding lack of funding and, sometimes, an emergency-based planning of intervention, are common drivers leading to low level of pavement conditions in terms of ride quality and safety. In addition both cost and environmental concerns due to monitoring stage are relevant issues within the management system of local and urban road network, especially. With the purpose of implementing sustainability in the road pavement management, this paper provides an approach based on coupled low- cost 3D image modelling distress identification and L…

Life Cycle Management delle pavimentazioni stradali

2022

Ormai parola chiave della nostra società, la sostenibilità è al centro di ricerche e dibattiti. La comunità scientifica si impegna da anni nella definizione di strumenti e metodologie comuni per riuscire a quantificarla, proponendo standard e linee guida basate sull’analisi del ciclo di vita, come il Life Cycle Assessment (LCA), di prodotti e processi. Nell’ambito dell’ingegneria civile esistono procedure standardizzate a livello internazionale per svolgere esercizi di Sustainability Assessment; queste risultano ben strutturate per gli edifici, meno dettagliate invece per altre opere, come le pavimentazioni stradali. Questo lavoro presenta il risultato principale del progetto “PavementLCM”,…

Environmental sustainability and energy assessment of bituminous pavements made with unconventional materials

2019

The increasing sensibility towards the questions related to climate change has made the scientists and technicians aware of the need to incorporate the principles of sustainable development into the road construction sector. In this view, recycled materials in road pavements and technologies to decrease the overall carbon footprint have become more and more important. Based on the ISO14040 series, the overall purpose of this study is calculating, by means of a systemic approach, the life-cycle energy and the carbon footprint of road pavement solutions. To this aim, several alternatives in terms of bituminous mixtures (warm mix asphalt, reclaimed asphalt pavements, waste plastics) were consi…

Rapid radiation of North American desert genera of the Papaveraceae: Evidence from restriction site mapping of PCR-amplified chloroplast DNA fragments

1995

Phylogenetic relationships of a group of North American desert genera of the Papaveraceae subfam. Papaveroideae and Platystemonoideae were investigated with an RFLP analysis of three PCR-amplified chloroplast genome regions. In agreement with earlier results it was found that subfam. Platystemonoideae is nested within subfam. Papaveroideae. The group under study is characterized by a large number of generic autapomorphies but only few informative synapomorphies. This is interpreted as strong evidence for a rapid radiation event caused by major climatic changes in the past. Poor phylogenetic resolution seems to reflect biological reality and not to be an experimental artifact. There is also …