scholarly journals Dynamic characteristics of very-high-rate GPS observations for seismology

2012 ◽  
Vol 64 (5) ◽  
pp. 369-377 ◽  
Author(s):  
Takuji Ebinuma ◽  
Teruyuki Kato
Keyword(s):  
Dynamic Characteristics ◽  
High Rate ◽  
Very High ◽  
Gps Observations

Biology, Management, and Protection of North American Sturgeon

2002 ◽  
Keyword(s):  
Extinction Risk ◽  
High Rate ◽  
Future Research ◽  
Shortnose Sturgeon ◽  
Management Options ◽  
Connecticut River ◽  
Acipenser Brevirostrum ◽  
Survival And Reproduction ◽  
Very High ◽  
Existing Data

<em>Abstract.</em>—The shortnose sturgeon, <em>Acipenser brevirostrum</em>, is a long-lived species that grows slowly, matures at an advanced age, and spawns only intermittently. In the Connecticut River, there are two distinct subpopulations of shortnose sturgeon, which have been separated by the Holyoke Dam for 157 years. My research addressed the viability and persistence for these two separate populations and the effects of dispersal, variation in survival and reproduction, and catastrophes. My risk-based approach used a stage-based metapopulation model that I constructed in RAMAS<sup>®</sup> GIS incorporating the available data. Based on the existing data, this population model for the shortnose sturgeon metapopulation in the Connecticut River made several predictions. The observed stability of the two subpopulations was possible either: with reproduction in both upper and lower subpopulations and small to moderate rates of dispersal between them; or with no reproduction in the lower subpopulation, very high reproduction in the upper subpopulation and high rate of net downstream dispersal. My results provided estimates of extinction risk for the shortnose sturgeon metapopulation under various management options and highlighted three key areas for future research, demonstrating the value of a risk-based approach. This approach is particularly useful for management of long-lived aquatic species.

Accelerated Erosion and Sedimentation in Southeast Asia

2005 ◽  
Author(s):  
Avijit Gupta
Keyword(s):  
Southeast Asia ◽  
Sediment Yield ◽  
Large Scale ◽  
Drainage Basin ◽  
High Rate ◽  
Annual Rainfall ◽  
Sediment Yields ◽  
Erosion Rates ◽  
Sediment Transfer ◽  
Very High

Periodic attempts to plot global distribution of erosion and sedimentation usually attribute most of Southeast Asia with a very high sediment yield (Milliman and Meade 1983). The erosion rates and sediment yield figures are especially high for maritime Southeast Asia. Milliman and Syvitski (1992), for example, listed 3000 t km−2 yr−1 for the archipelagos and peninsulas of Southeast Asia. They provided a number of natural explanations for the high erosion rate: location near active plate margins, pyroclastic eruptions, steep slopes, and mass movements. This is also a region with considerable annual rainfall, a very substantial percentage of which tends to be concentrated in a few months and falls with high intensity. Part of Southeast Asia (the Philippines, Viet Nam, Timor) is visited by tropical cyclones with heavy, intense rainfall and possible associated wind damage to existing vegetation. The fans at the foot of slopes, the large volume of sediment stored in the channel and floodplain of the rivers, and the size of deltas all indicate a high rate of erosion and episodic sediment transfer. This episodic erosion and sediment transfer used to be controlled for most of the region by the thick cover of vegetation that once masked the slopes. When vegetation is removed soil and regolith de-structured, and natural slopes altered, the erosion rates and sediment yield reach high figures. Parts of Southeast Asia display striking anthropogenic alteration of the landscape, although the resulting accelerated erosion may be only temporary, operating on a scale of several years. Over time the affected zones shift, and slugs of sediment continue to arrive in a river but from different parts of its drainage basin. The combination of anthropogenic alteration and fragile landforms may give rise to very high local yields. Sediment yields of more than 15 000 t km−2 yr−1 have been estimated from such areas (Ruslan and Menam, cited in Lal 1987). This is undoubtedly towards the upper extreme, but current destruction of the vegetation cover due to deforestation, expansion of agriculture, mining, urbanization, and implementation of large-scale resettlement schemes has increased the sediment yield from < 102 to > 103 t km−2 yr−1.

Comorbidity of Bipolar and Substance Use Disorders

2020 ◽  
pp. 75-82
Author(s):  
Josh E. Becker ◽  
E. Sherwood Brown
Keyword(s):  
Bipolar Disorder ◽  
Substance Use ◽  
Treatment Adherence ◽  
Substance Use Disorder ◽  
Psychological Factors ◽  
High Rate ◽  
Special Treatment ◽  
Poor Treatment ◽  
Very High

Bipolar disorder and substance use disorder co-occur at very high rates. The high rate is likely due to a complex interaction of biological, social, and psychological factors, and some research suggests that use of substances may be to mitigate symptoms associated with bipolar disorder. Some studies have shown that men with bipolar disorder may be at a higher risk for a substance use disorder than women. The co-occurrence of these disorders leads to poorer treatment outcomes because of higher rates of suicidality, poor treatment adherence, lower quality of life, and more frequent relapse. This population deserves special treatment consideration.

scholarly journals Analysis and Visualization of Data Assimilating Hive and COGNOS Insight 10.2.2

2018 ◽  
Vol 7 (2.6) ◽  
pp. 318
Author(s):  
Mandeep Virk ◽  
Vaishali Chauhan ◽  
Urvashi Mittal
Keyword(s):  
Big Data ◽  
Data Analysis ◽  
High Rate ◽  
Huge Data ◽  
Suitable Form ◽  
Visualization Of Data ◽  
Very High

Data analysis is the most grueling tasks in the coinciding world. The size of data is increasing at a very high rate because of the procreation of peripatetic gadgets and sensors attached. To make that data readable is another challenging task. Effectual visualization provides users with better analysis capabilities and helps in deriving evidence about data. Many techniques and tools have been invented to deal with such problems but to make these tools amendable is the main mystification. It is the big data that originated as a technology which is proficient in assembling and transforming the colossal and divergent figures of data, providing organizations with meaningful insights for derivingimprovedresults. Big data is accustomed to delineate technologies and techniques which are used to store, manage, distribute and analyze huge data sheets. The existent of administrating this research is to make the data readable in a more suitable form with less comprehend. Mainly the research emphasizes on the fabrication of using COGNOS insight 10.2.2 for visualizing data and implementing the analyzed results derived from the hive. The assimilation between tools has also been reformed in this research. 

scholarly journals Hybrid Wavelet and Principal Component Analyses Approach for Extracting Dynamic Motion Characteristics from Displacement Series Derived from Multipath-Affected High-Rate GNSS Observations

2019 ◽  
Vol 12 (1) ◽  
pp. 79 ◽  
Author(s):  
Mosbeh R. Kaloop ◽  
Cemal O. Yigit ◽  
Ahmed El-Mowafy ◽  
Ahmet A. Dindar ◽  
Mert Bezcioglu ◽  
...  
Keyword(s):  
Dynamic Characteristics ◽  
Principal Component ◽  
Dominant Frequency ◽  
Shaking Table ◽  
Global Navigation Satellite Systems ◽  
High Rate ◽  
Engineering Structures ◽  
Satellite Systems ◽  
Multipath Errors ◽  
Gnss Observations

Nowadays, the high rate GNSS (Global Navigation Satellite Systems) positioning methods are widely used as a complementary tool to other geotechnical sensors, such as accelerometers, seismometers, and inertial measurement units (IMU), to evaluate dynamic displacement responses of engineering structures. However, the most common problem in structural health monitoring (SHM) using GNSS is the presence of surrounding structures that cause multipath errors in GNSS observations. Skyscrapers and high-rise buildings in metropolitan cities are generally close to each other, and long-span bridges have towers, main cable, and suspender cables. Therefore, multipath error in GNSS observations, which is typically added to the measurement noise, is inevitable while monitoring such flexible engineering structures. Unlike other errors like atmospheric errors, which are mostly reduced or modeled out, multipath errors are the largest remaining unmanaged error sources. The high noise levels of high-rate GNSS solutions limit their structural monitoring application for detecting load-induced semi-static and dynamic displacements. This study investigates the estimation of accurate dynamic characteristics (frequency and amplitude) of structural or seismic motions derived from multipath-affected high-rate GNSS observations. To this end, a novel hybrid model using both wavelet-based multiscale principal component analysis (MSPCA) and wavelet transform (MSPCAW) is designed to extract the amplitude and frequency of both GNSS relative- and PPP- (Precise Point Positioning) derived displacement motions. To evaluate the method, a shaking table with a GNSS receiver attached to it, collecting 10 Hz data, was set up close to a building. The table was used to generate various amplitudes and frequencies of harmonic motions. In addition, 50-Hz linear variable differential transformer (LVDT) observations were collected to verify the MSMPCAW model by comparing their results. The results showed that the MSPCAW could be efficiently used to extract the dynamic characteristics of noisy dynamic movements under seismic loads. Furthermore, the dynamic behavior of seismic motions can be extracted accurately using GNSS-PPP, and its dominant frequency equals that extracted by LVDT and relative GNSS positioning method. Its accuracy in determining the amplitude approaches 91.5% relative to the LVDT observations.

scholarly journals The competitiveness of Czech agrarian trade within the context of the global crisis

2013 ◽  
Vol 59 (No. 4) ◽  
pp. 183-193 ◽  
Author(s):  
L. Smutka ◽  
J. Burianová
Keyword(s):  
Czech Republic ◽  
World Trade ◽  
World Economy ◽  
Agricultural Trade ◽  
High Rate ◽  
The Czech Republic ◽  
The World ◽  
Territorial Structure ◽  
Merchandise Trade ◽  
Very High

World trade underwent a significant shock within the recent years, which caused a decline in the world economy primarily in the year 2009. Within the following years (2010 and 2011), the high rate of growth from the years preceding the crisis could not be restored. The crisis had an impact on all segments of the merchandise trade, whereby the trade in agricultural and food products was affected the least by the crisis. In the case of the Czech Republic, the crisis of the global and national economy was reflected in the case of agricultural trade primarily by the way of a decline in the rate of the growth of export, which was very high in the period prior to the crisis. As far as the territorial structure and commodity structure of agricultural trade is concerned, their development in the years 2008&ndash;2011 was not affected in any largely significant manner. In relation to the main objective of this article, which was to identify the effects of the crisis on the competitiveness of Czech agricultural trade, it may be stated that the crisis itself did not worsen the competitiveness of agricultural trade in any significant manner. &nbsp;

scholarly journals Origin, diversity and distribution of freshwater epigean amphipods in Maghreb

2019 ◽  
Vol 55 ◽  
pp. 13 ◽  
Author(s):  
Khaoula Ayati ◽  
Ramzi Hadjab ◽  
Hichem Khammar ◽  
Sonia Dhaouadi ◽  
Christophe Piscart ◽  
...  
Keyword(s):  
Northern Africa ◽  
High Rate ◽  
Conservation Strategies ◽  
Undescribed Species ◽  
General Lack ◽  
The World ◽  
Low Diversity ◽  
Freshwater Amphipods ◽  
Freshwater Fauna ◽  
Very High

Northern Africa, although one of the world hotpots of biodiversity, is poorly studied and the freshwater fauna living in this part of the world remains partly unknown. This study focused on the diversity and distribution of the poorly known epigean freshwater amphipods. We performed an exhaustive analysis of the literature on this group of crustaceans and sampled 106 additional localities from the eastern part of Algeria and in Tunisia. Our results showed an important diversity with 25 species (including the presence of at least three new undescribed species) and a very high rate of endemism with 52% of species occurring at on only 1 or 2 sites. We also highlighted a very low diversity on each site with only 4.4% of sites harboring more than 1 species. The comparative distribution of certain species between Europe and Maghreb and also between the western and eastern part of Northern Africa allow us to discuss some hypotheses about the factors underlying this endemism and the biogeographical origin of species. However, our study revealed a general lack of knowledge in the region, especially in the South of Morocco and Algeria. Hence, more information would be needed to propose adapted conservation strategies of freshwater fauna in Maghreb.

SURFACE DEFORMATION AND EARLY WARNING MAGNITUDE OF 2016 KAIKOURA (NEW ZEALAND) EARTHQUAKE FROM HIGH-RATE GPS OBSERVATIONS

2017 ◽  
Vol 60 (6) ◽  
pp. 602-612
Author(s):  
SONG Chuang ◽  
XU Cai-Jun ◽  
WEN Yang-Mao ◽  
YI Lei ◽  
XU Wen
Keyword(s):  
New Zealand ◽  
Early Warning ◽  
Surface Deformation ◽  
High Rate ◽  
Gps Observations

The prevalence and the weakness of an early name mapping preference

1998 ◽  
Vol 25 (1) ◽  
pp. 121-147 ◽  
Author(s):  
JULIE A. EVEY ◽  
WILLIAM E. MERRIMAN
Keyword(s):  
Test Word ◽  
Corrective Feedback ◽  
High Rate ◽  
Current Investigation ◽  
Fast Mapping ◽  
Large Sets ◽  
The One ◽  
Very High ◽  
Test Objects ◽  
Do So

An empirical puzzle regarding toddlers' fast mapping motivated the current investigation. Whereas children between 1;10 and 2;1 have shown only a modest rate of mapping novel nouns onto unfamiliar rather than familiar objects, a very high rate has been observed in those between 1;4 and 1;8 (Mervis & Bertrand, 1994). Study 1 examined whether young two-year-olds (N=40, mean age=2;1) might map at a higher rate when tested with procedures unique to Mervis & Bertrand's assessment – strong corrective feedback rather than mild positive non-contingent feedback; large sets of test objects rather than pairs; presentation of easier tests first. Only the first variable affected performance in a manner that could solve the puzzle. Unfamiliar kinds were selected at a much higher rate under corrective (0·86) than non-contingent (0·57) feedback. Although nearly every child in the non-contingent group chose correctly on the first trial, many failed to do so thereafter. In Study 2, rather than presenting a test word to the children (N=16, mean age=2;2), the experimenter merely asked for ‘the one I want’. Unfamiliar kinds were selected much less often than in Study 1, suggesting that at least one lexical principle proposed in the literature underlies the noun mapping preference. Changes over trials in the two studies indicated that the noun mapping preference is quite prevalent, but unless initial choices are strongly reinforced, an increase in the salience of familiar kinds after the first trial lures some children into error. Consistent with this analysis, toddlers in Study 3 (N=24, mean age=2;1) who received non-contingent strong acceptance for their noun mapping decisions, selected unfamiliar kinds more often than those who had received non-contingent mild acceptance in Study 1.

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