Search results for "Plateau"

Origin of the low-frequency plateau and the light-scattering slow mode in semidilute poly(ethylene glycol) solutions

2019

A low-frequency plateau is often found in the rheological spectra of various kinds of semidilute solutions of polymers and other colloids; also, many such solutions have been reported to show slow-modes in their dynamic light scattering autocorrelation functions. Both these observations may lead to the hypothesis of weak associative network structures built by the dissolved polymer chains or colloidal building blocks. To challenge this hypothesis, we conduct a series of comparative studies on semidilute solutions of poly(ethylene glycol) by using classical rheology as well as passive microrheology based on dynamic light scattering, along with structural studies using static light scattering…

Long-term decrease in Asian monsoon rainfall and abrupt climate change events over the past 6,700 years

2021

Significance The variability of the Asian summer monsoon (ASM) is important for the functioning of ecological and societal systems at regional to continental scales, but the long-term evolution and interannual variability of this system is not well understood. Here, we present a stable isotope–based reconstruction of ASM variability covering 4680 BCE to 2011 CE. Superimposed on a gradual drying trend, a rapid drop in mean annual precipitation (>40%) toward persistently drier conditions occurred in ∼1675 BCE. This megadrought caused regional forest deterioration and enhanced aeolian activity affecting Chinese ecosystems. We argue that this abrupt aridification starting ∼2000 BCE triggered wa…

La Meseta de Requena-Utiel entre los siglos II-I a.C.: La Romanización del territorio ibérico de Kelin

2013

En la presente Tesis Doctoral se aborda el tema general de la romanización de los pueblos ibéricos en la fachada mediterránea peninsular a partir del caso concreto del territorio de una ciudad ibérica, Kelin – Los Villares (Caudete de las Fuentes, València). Dicha ciudad, ocupada entre los siglos VII-I a.C., sabemos que al menos desde el s. V a.C. organizó un territorio a su alrededor, con unos límites muy similares a los de la actual comarca de Requena-Utiel. Ha sido excavada desde los años 90 desde el Servicio de Investigación Prehistórica de la Diputación de Valencia y la Universitat de València, siendo la directora de la presente tesis la directora de la última fase de excavación, Consu…

Monitoring Water and Energy Cycles at Climate Scale in the Third Pole Environment (CLIMATE-TPE)

2021

A better understanding of the water and energy cycles at climate scale in the Third Pole Environment is essential for assessing and understanding the causes of changes in the cryosphere and hydrosphere in relation to changes of plateau atmosphere in the Asian monsoon system and for predicting the possible changes in water resources in South and East Asia. This paper reports the following results: (1) A platform of in situ observation stations is briefly described for quantifying the interactions in hydrosphere-pedosphere-atmosphere-cryosphere-biosphere over the Tibetan Plateau. (2) A multiyear in situ L-Band microwave radiometry of land surface processes is used to develop a new microwave r…

Managerial career plateaue : determinants, consequences and coping strategies

2008

Masteroppgave i økonomi og administrasjon - Universitetet i Agder 2008 During last decade managers who were practicing in different industries in Sri Lanka, have struggled with having less promotional opportunities. This initially leads them to become plateaued with their career. This study applied the theory from career management literature to examine factors significantly influenced to employees’ perception of being subjectively plateaued and objectively plateaued. Additionally, this study aims to identify the relationship between career plateauing and its implication toward job satisfaction, organizational commitment, intention to quit and job induced stress. Further, coping strategies …

Preliminary results of fault-related permeability structures associated to the Scicli-Ragusa fault segments, Hyblean Plateau, Sicily

2010

Nella zona di Ragusa (Plateau Ibleo, Sicilia sud-orientale) la presenza di bitume all’interno di rocce carbonatiche di età oligo-miocenica, caratterizzate da una porosità primaria oggi compresa tra 0 e 10% (Formazione Ragusa, permette di osservare il ruolo esercitato da faglie e fratture nella circolazione degli idrocarburi. Con l’obiettivo quindi di effettuare studi mirati alla caratterizzazione petrofisica delle diverse tipologie di faglie e fratture affioranti, è stato condotto uno studio di terreno preliminare, che ha permesso la definizione dell’assetto geologico-strutturale della porzione occidentale del Plateau Ibleo, lungo il sistema di faglie denominato Scicli-Ragusa. Inoltre, sull…

Positron Studies of Subsurface Zone in Titanium Created in Sliding Wear

2014

Positron annihilation studies of the subsurface zone constituted during dry sliding in pure titanium are reported. A new type of defect depth profile in this zone, which is not an exponential decay usually reported for other metals and alloys, is observed. Two layers in the subsurface zone are present in this metal. In the layer adjacent to the worn surface, the characteristic plateau of the mean positron lifetime that extends to a depth of 60–70 μm was observed. Small vacancy clusters and dislocations were recognized in this layer. At deeper zone, the mean positron lifetime decreased exponentially in the manner typical for the other metals. In this zone, vacancy clusters increase in size a…

Single zircon evaporation ages from Obudu Plateau: First evidence of archaean components in the schists of south-eastern Nigeria

1998

Precipitation Pulses and Soil CO2 Emission in Desert Shrubland of Artemisia ordosica on the Ordos Plateau of Inner Mongolia, China

2009

National Natural Science Foundation of China [40730105, 40501072, 40673067]; National Key Basic Research Program (973 Program) of China [2002CB412503]; Chinese Academy of Sciences [KZCX2-YW-149]

Quantifying the P-T-t conditions of north-south Lhasa terrane accretion: new insight into the pre-Himalayan architecture of the Tibetan plateau

2014

An integrated field, petrological and geochronological study of the Basong Tso region of south-eastern Tibet has constrained the timing and P–T conditions of north–south Lhasa terrane accretion and provides new insight into the tectonothermal evolution of the Tibetan plateau. Two distinct high-grade metamorphic belts are recognized in the region: a southern belt (the Basong Tso complex) that consists of sheared schist and orthogneiss; and a northern belt (the Zhala complex) that comprises paragneiss and granite. Combined pseudosection modelling and U–Pb geochronology of monazite and zircon indicates that the Basong Tso complex records peak metamorphic conditions of 9 ± 0.5 kbar and 690 ± 25…