scholarly journals Spatio-temporal priority revisited: The role of feature identity and similarity for object correspondence in apparent motion.

2012 ◽  
Vol 38 (4) ◽  
pp. 975-988 ◽  
Author(s):  
Elisabeth Hein ◽  
Cathleen M. Moore
Keyword(s):  
Apparent Motion ◽  
Object Correspondence ◽  
Temporal Priority ◽  
Spatio Temporal

scholarly journals The Role of Spatio-Temporal Information to Govern the COVID-19 Pandemic: A European Perspective

2021 ◽  
Vol 10 (3) ◽  
pp. 166
Author(s):  
Hartmut Müller ◽  
Marije Louwsma
Keyword(s):  
European Union ◽  
Spatial Distribution ◽  
Spatial Information ◽  
National Level ◽  
Temporal Information ◽  
The European Union ◽  
Member States ◽  
Heavy Burden ◽  
Spatio Temporal

The Covid-19 pandemic put a heavy burden on member states in the European Union. To govern the pandemic, having access to reliable geo-information is key for monitoring the spatial distribution of the outbreak over time. This study aims to analyze the role of spatio-temporal information in governing the pandemic in the European Union and its member states. The European Nomenclature of Territorial Units for Statistics (NUTS) system and selected national dashboards from member states were assessed to analyze which spatio-temporal information was used, how the information was visualized and whether this changed over the course of the pandemic. Initially, member states focused on their own jurisdiction by creating national dashboards to monitor the pandemic. Information between member states was not aligned. Producing reliable data and timeliness reporting was problematic, just like selecting indictors to monitor the spatial distribution and intensity of the outbreak. Over the course of the pandemic, with more knowledge about the virus and its characteristics, interventions of member states to govern the outbreak were better aligned at the European level. However, further integration and alignment of public health data, statistical data and spatio-temporal data could provide even better information for governments and actors involved in managing the outbreak, both at national and supra-national level. The Infrastructure for Spatial Information in Europe (INSPIRE) initiative and the NUTS system provide a framework to guide future integration and extension of existing systems.

scholarly journals From Loschmidt daemons to time-reversed waves

2016 ◽  
Vol 374 (2069) ◽  
pp. 20150156 ◽  
Author(s):  
Mathias Fink
Keyword(s):  
Wave Propagation ◽  
Time Reversal ◽  
Degrees Of Freedom ◽  
Point Of View ◽  
Propagation Time ◽  
Reversal Invariance ◽  
Spatial Boundary ◽  
Dual Approaches ◽  
Spatio Temporal

Time-reversal invariance can be exploited in wave physics to control wave propagation in complex media. Because time and space play a similar role in wave propagation, time-reversed waves can be obtained by manipulating spatial boundaries or by manipulating time boundaries. The two dual approaches will be discussed in this paper. The first approach uses ‘time-reversal mirrors’ with a wave manipulation along a spatial boundary sampled by a finite number of antennas. Related to this method, the role of the spatio-temporal degrees of freedom of the wavefield will be emphasized. In a second approach, waves are manipulated from a time boundary and we show that ‘instantaneous time mirrors’, mimicking the Loschmidt point of view, simultaneously acting in the entire space at once can also radiate time-reversed waves.

A geographical analysis of the first wave of Covid-19 with reference to highland and lowland regions of India

2021 ◽  
Vol 67 (3) ◽  
pp. 263-281
Author(s):  
Bindhy Wasini Pandey ◽  
◽  
Yuvraj Singh ◽  
Usha Rani ◽  
Roosen Kumar ◽  
...  
Keyword(s):  
Infectious Diseases ◽  
Temporal Pattern ◽  
Regional Disparity ◽  
Healthcare Facilities ◽  
Indian Himalayan Region ◽  
Pollution Levels ◽  
Extensive Coverage ◽  
The World ◽  
Spatio Temporal

The issue of health has become a major concern in recent years as a result of extensive coverage of media reporting outbreaks of diseases and the spread of deadly infectious diseases around the world. There has been a growing concern over the accessibility and affordability of healthcare facilities. The spread of the ongoing pandemic COVID-19 has been felt all over the world. However, the rate of infection varies across certain regions of the world. There exists intra-regional disparity as well. Recent research shows that there are latitudinal and altitudinal variations in the spread of the COVID-19. This paper studies variation of infection COVID-19 across the highlands of the Indian Himalayan Region (IHR) and the lowland areas in India. The paper also examines the role of geographical spaces in the spread of coronavirus in these regions. The study indicates that place-based effects (altitude, temperature, pollution levels, etc.) on health can be seen in a variety of ways; therefore, locational issues are very important for addressing health questions. The paper also analyses the Spatio-temporal pattern of the COVID-19 pandemic in the study area to understand the nature of the disease in different locations.

scholarly journals Clarifying the role of radiative mechanisms in the spatio-temporal changes of land surface temperature across the Horn of Africa

2019 ◽  
Vol 221 ◽  
pp. 210-224 ◽  
Author(s):  
Temesgen Alemayehu Abera ◽  
Janne Heiskanen ◽  
Petri Pellikka ◽  
Miina Rautiainen ◽  
Eduardo Eiji Maeda
Keyword(s):  
Surface Temperature ◽  
Land Surface Temperature ◽  
Land Surface ◽  
Temporal Changes ◽  
Horn Of Africa ◽  
Spatio Temporal

scholarly journals Global XCO<sub>2</sub> anomalies as seen by Orbiting Carbon Observatory-2

2018 ◽  
Author(s):  
Janne Hakkarainen ◽  
Iolanda Ialongo ◽  
Shamil Maksyutov ◽  
David Crisp
Keyword(s):  
Biomass Burning ◽  
Complex Model ◽  
Anthropogenic Emissions ◽  
Local Concentration ◽  
Fossil Fuel Combustion ◽  
Annual Variations ◽  
Middle Latitudes ◽  
Eastern Usa ◽  
Spatio Temporal

Abstract. NASA's carbon dioxide mission, Orbiting Carbon Observatory-2, has been operating for three full years (2015–2017). Here, we provide a global (60° S–60° N) view of the XCO2 anomalies along with their annual variations and seasonal patterns. We show that the XCO2 anomaly patterns are robust and consistent from year-to-year. We compare these anomalies to fluxes from anthropogenic, biospheric and biomass burning and to model-simulated local concentration enhancements. We find that, despite the simplicity of the method, the anomalies describe the spatio-temporal variability of XCO2 (including anthropogenic emissions and seasonal variability related to vegetation and biomass burning) consistently with more complex model-based approaches. We see, for example, that positive anomalies correspond to fossil fuel combustion over the major industrial areas (e.g., China, eastern USA, central Europe, India, and the Highveld region in South Africa), shown as large positive XCO2 enhancements in the model simulations. Also, we find corresponding positive anomalies and fluxes over biomass burning areas during different fire seasons. On the other hand, the largest negative anomalies correspond to the growing season in the northern middle latitudes, characterized by negative XCO2 enhancements from simulations and high SIF values (indicating the occurrence of photosynthesis). Finally, we show how XCO2 anomalies facilitate the detection of anthropogenic signatures for several local scale case studies, both in the Northern and Southern Hemisphere. The results demonstrate the potential of satellite-based XCO2 observations for understanding the role of man-made and natural contributions to the atmospheric CO2 levels.

scholarly journals The role of socioeconomic and climatic factors in the spatio-temporal variation of human rabies in China

2018 ◽  
Vol 18 (1) ◽  
Author(s):  
Danhuai Guo ◽  
Wenwu Yin ◽  
Hongjie Yu ◽  
Jean-Claude Thill ◽  
Weishi Yang ◽  
...  
Keyword(s):  
Temporal Variation ◽  
Climatic Factors ◽  
Human Rabies ◽  
Spatio Temporal

scholarly journals A SEA BREEZE NUMERICAL SIMULATION AND CIRCULATION ANALYSIS IN ORAN, ALGERIA, URBAN ATMOSPHERE

2016 ◽  
Vol 9 (2) ◽  
pp. 139-145
Author(s):  
Abdelkrim Benlefki ◽  
Benouada Douaiba ◽  
Azzi Abbes
Keyword(s):  
Numerical Simulation ◽  
Sea Breeze ◽  
Urban Atmosphere ◽  
Atmospheric Flow ◽  
The North ◽  
Grid Simulation ◽  
Surface Data ◽  
Spatio Temporal ◽  
North Algeria

In this paper the sea breeze dynamics in Oran agglomeration atmosphere, in the north Algeria, is investigated and analyzed by a numerical simulation of Oran agglomeration atmosphere, using SUBMESO model during diurnal cycle of June 24, 2010, in order to predict the spatio-temporal starting of sea breeze, its intensity and relative direction through atmospheric flow variations analysis, and to evaluate the role of thermal circulations on sea breeze direction, intensity and ventilation and its effect on pollutant transport. The study of this area has not been investigated or analyzed in any framework, the numerical simulation was preceded by a topographic and surface data processing in order to generate the grid simulation, with a specific characteristics used by the SUBEMESO and SM2-U (Soil Model for Sub-Meso scales Urbanized) models. This simulation allowed us to know all sea breeze characteristics during the study period.

scholarly journals The Role of Selected Signaling Pathways and Transcription Factors in Chondrogenesis

2021 ◽  
Author(s):  
Joseph A. Ayariga
Keyword(s):  
Stem Cells ◽  
Signaling Pathways ◽  
Temporal Distribution ◽  
Signaling Molecules ◽  
Transcriptional Factors ◽  
Cartilage Tissue ◽  
Cartilage Formation ◽  
Cartilage Development ◽  
Spatio Temporal

During cartilage development, the lineage commitment and condensation of stem cells into chondrocytes and their differentiation involves a ubiquitous signaling cascades and huge numbers of transcriptional factors. The kinetic requirements and the stoichiometry for the expression of key transcriptional factors are relevant and must be met to form proper and functionally competent cartilage tissue. More interestingly also, an exact and precise spatio-temporal distribution of these molecules are as necessary in the proper tissue morphogenesis and patterning as the relevant physical conditions and micro environmental forces playing at the background during embryogenesis. A milestone of experimental achievements has been obtained over the years on several signaling pathways involved in cartilage development. Several fate determining transcriptional factors has also been investigated and determined with regards to the transition of stem cells (pluripotent, embryonic, etc.) into chondrocytes. These transcriptional factors serve as master controllers in chondrocytes proliferation and hypertrophy. Concerns that variability in signaling and transcriptional factors have detrimental effect on cartilage formation and could potentiate most cartilage related diseases have led most scientists to investigate the role of signaling molecules and transcriptional factors implicated in osteoarthritis, rheumatoid arthritis, and other cartilage degenerative diseases. On bases of spatio-temporal distribution of transcriptional factors, there exist functional overlaps, hence, it is difficult to draw a hard line of demarcation of roles at each point of the cell&rsquo;s life, nonetheless, it is also markedly established that some factors are skewed to the chondrocyte&rsquo; survival and proliferation, and others known for their master&rsquo;s role in the cell&rsquo;s apoptotic, necrotic and senescence. Here we review some published works on selected signaling pathways and transcriptional factors that are preferentially expressed in chondrogenic cells and their role as major players in cartilage formation, cartilage diseases, along with some highlights of unique signaling molecules that are indispensable in cartilage tissue regeneration and management.

MATHEMATICAL MODELLING OF CANCER CELL INVASION OF TISSUE: THE ROLE OF THE UROKINASE PLASMINOGEN ACTIVATION SYSTEM

2005 ◽  
Vol 15 (11) ◽  
pp. 1685-1734 ◽  
Author(s):  
M. A. J. CHAPLAIN ◽  
G. LOLAS
Keyword(s):  
Cancer Cells ◽  
Cancer Cell ◽  
Cell Invasion ◽  
The Body ◽  
Plasminogen Activation ◽  
Cancer Cell Invasion ◽  
Plasminogen Activation System ◽  
Activation System ◽  
Spatio Temporal

The growth of solid tumours proceeds through two distinct phases: the avascular and the vascular phase. It is during the latter stage that the insidious process of cancer invasion of peritumoral tissue can and does take place. Vascular tumours grow rapidly allowing the cancer cells to establish a new colony in distant organs, a process that is known as metastasis. The progression from a single, primary tumour to multiple tumours in distant sites throughout the body is known as the metastatic cascade. This is a multistep process that first involves the over-expression by the cancer cells of proteolytic enzyme activity, such as the urokinase-type plasminogen activator (uPA) and matrix metalloproteinases (MMPs). uPA itself initiates the activation of an enzymatic cascade that primarily involves the activation of plasminogen and subsequently its matrix degrading protein plasmin. Degradation of the matrix then enables the cancer cells to migrate through the tissue and subsequently to spread to secondary sites in the body. In this paper we consider a mathematical model of cancer cell invasion of tissue (extracellular matrix) which focuses on the role of the plasminogen activation system. The model consists of a system of reaction-diffusion-taxis partial differential equations describing the interactions between cancer cells, urokinase plasminogen activator (uPA), uPA inhibitors, plasmin and the host tissue. The focus of the modelling is on the spatio-temporal dynamics of the uPA system and how this influences the migratory properties of the cancer cells through random motility, chemotaxis and haptotaxis. The results obtained from numerical computations carried out on the model equations produce rich, dynamic heterogeneous spatio-temporal solutions and demonstrate the ability of rather simple models to produce complicated dynamics, all of which are associated with tumour heterogeneity and cancer cell progression and invasion.

Cheapness and (labor-)power: The role of early modern Brazilian sugar plantations in the racializing Capitalocene

2018 ◽  
Vol 38 (1) ◽  
pp. 35-52
Author(s):  
Joshua R Eichen
Keyword(s):  
Early Modern ◽  
Capital Accumulation ◽  
Northeast Brazil ◽  
Emergent Relations ◽  
Industrial Sites ◽  
Cheap Labor ◽  
Labor Power ◽  
Sugar Plantations ◽  
Spatio Temporal

This essay looks at the historical geography of sugar plantations in Northeast Brazil during the 16th- and 17th-centuries to critique the spatio-temporality of the discourse of the Anthropocene. I argue that sugar plantations were key places in early systemic cycles of capital accumulation with their grim calculus of cheap labor-power and acceptable deaths. Sugar plantations were simultaneously prototypical racializing state actors and part of the emergent relations of capital changing the climate. With their rationalized, time-disciplined labor for processing cane into sugar, plantations were not only fundamentally proto-industrial sites, but also one of capital’s laboratories of modernity. They were primordial sites of proletarianization, of spatio-temporal patterns that repopulated the Americas and central in the production not of the Anthropocene but of the racializing Capitalocene.

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