High-Frequency Continuous Monitoring to Track Vapor Intrusion Resulting From Naturally Occurring Pressure Dynamics

2017 ◽  
Vol 27 (2) ◽  
pp. 9-25 ◽  
Author(s):  
Vitthal Hosangadi ◽  
Brandon Shaver ◽  
Blayne Hartman ◽  
Michael Pound ◽  
Mark L. Kram ◽  
...  
Keyword(s):  
High Frequency ◽  
Continuous Monitoring ◽  
Vapor Intrusion ◽  
Naturally Occurring ◽  
Pressure Dynamics

Vi snakker sådan: An analysis of the Danish discourse-pragmatic marker sådan

2021 ◽  
pp. 1-37
Author(s):  
Christian Schoning ◽  
Jørn Helder ◽  
Chloé Diskin-Holdaway
Keyword(s):  
High Frequency ◽  
Preliminary Investigation ◽  
Analytic Approach ◽  
Spoken Discourse ◽  
Pragmatic Markers ◽  
Naturally Occurring ◽  
Self Repair ◽  
Interactional Discourse

Abstract The last three decades have witnessed increasing interest in discourse-pragmatic markers (DPMs), both with regards to their high frequency in spoken discourse and their multifunctionality in interaction. Most studies have centered on English, with studies on Danish restricted to a handful of previous interactional discourse analyses. This paper is a preliminary investigation of the Danish word sådan (commonly glossed as ‘such’ or ‘like this/that’). A qualitative, form-based, discourse analytic approach is undertaken on over 40 minutes of naturally occurring Danish talk to argue that sådan qualifies as a DPM. In service of textual, subjective, and intersubjective macro-functions, sådan illustrates; exemplifies; marks hesitation; approximates a quantity; mitigates, hedges, or softens; and allows self-correction or self-repair. These findings are discussed in terms of their implications for sådan’s place in the Danish DPM system and our understanding of DPMs across languages.

scholarly journals Testing claims of a usage-based phonology with Liverpool English t-to-r

2011 ◽  
Vol 15 (3) ◽  
pp. 523-547 ◽  
Author(s):  
LYNN CLARK ◽  
KEVIN WATSON
Keyword(s):  
Oral History ◽  
Word Frequency ◽  
High Frequency ◽  
English Speakers ◽  
Cognitive Grammar ◽  
Rule Based ◽  
British English ◽  
Naturally Occurring ◽  
Motivating Factor ◽  
Oral History Interviews

The variable phenomenon in which /t/ can be realized as a tap or rhotic approximant in varieties of Northern British English (commonly referred to as t-to-r, Wells 1982: 370) has received some attention in English linguistics as debates have appeared over how best to model its phonology (e.g. Carr 1991; Docherty et al. 1997; Broadbent 2008). The occurrence of t-to-r seems to be constrained by the preceding and following phonological environment in a largely systematic way and so it is often accounted for within a rule-based model of grammar. Problematically, however, the rule does not apply blindly across the board to all words which fit the specified phonological pattern. Instead, t-to-r shows evidence of being lexically restricted, and this fact has recently encouraged a usage-based interpretation. Until now, there has been relatively little attempt to test the usage-based thesis directly with fully quantified data gleaned from naturally occurring conversation. This article investigates the extent to which certain usage-based predictions can account for variation attested in t-to-r in Liverpool English. Using oral history interviews with Liverpool English speakers born in the early 1900s, we examine the usage-based predictions first proposed by Broadbent (2008) that t-to-r is more likely in (a) high-frequency words and (b) high-frequency phrases. There is some support for the importance of lexical frequency as a motivating factor in the use of t-to-r, but our data do not fully support either of these claims wholesale. We suggest that t-to-r is not constrained simply by word frequency or phrase frequency alone, but by a combination of both. Finally, we explore the possibility of employing notions from Cognitive Grammar such as schema strength (e.g. Taylor 2002; Bybee 1995: 430) in our interpretation of these data.

Estimating nitrate retention in a large constructed wetland using high-frequency, continuous monitoring and hydrologic modeling

2017 ◽  
Author(s):  
Chad W Drake ◽  
Christopher S Jones ◽  
Keith E Schilling ◽  
Antonio Arenas Amado ◽  
Larry J Weber
Keyword(s):  
Constructed Wetland ◽  
High Frequency ◽  
Continuous Monitoring ◽  
Hydrologic Modeling ◽  
Nitrate Retention

scholarly journals High-frequency fluctuations of indoor pressure: A potential driving force for vapor intrusion in urban areas

2020 ◽  
Vol 710 ◽  
pp. 136309
Author(s):  
Yijun Yao ◽  
Yuting Xiao ◽  
Jian Luo ◽  
Genfu Wang ◽  
Jonathan Ström ◽  
...  
Keyword(s):  
High Frequency ◽  
Urban Areas ◽  
Driving Force ◽  
Vapor Intrusion ◽  
Frequency Fluctuations

scholarly journals The prevalence ofNeospora caninumand co-infection withToxoplasma gondiiby PCR analysis in naturally occurring mammal populations

Parasitology ◽  
2005 ◽  
Vol 132 (1) ◽  
pp. 29-36 ◽  
Author(s):  
J. M. HUGHES ◽  
R. H. WILLIAMS ◽  
E. K. MORLEY ◽  
D. A. N. COOK ◽  
R. S. TERRY ◽  
...  
Keyword(s):  
Rattus Norvegicus ◽  
High Frequency ◽  
Neospora Caninum ◽  
Low Frequency ◽  
Ovis Aries ◽  
Pcr Analysis ◽  
Mus Domesticus ◽  
Protozoan Parasites ◽  
Naturally Occurring ◽  
Pcr Techniques

Neospora caninumandToxoplasma gondiiare closely related intracellular protozoan parasites associated with bovine and ovine abortion respectively. Little is known about the extent ofNeospora/Toxoplasmaco-infection in naturally infected populations of animals. Using nested PCR techniques, based on primers from the Nc5 region ofN. caninumand SAG1 forT. gondii, the prevalence ofN. caninumand its co-infection withT. gondiiwere investigated in populations ofMus domesticus,Rattus norvegicusand aborted lambs (Ovis aries). A low frequency of infection withN. caninumwas detected in theMus domesticus(3%) andRattus norvegicus(4·4%) populations. A relatively high frequency of infection withN. caninumwas detected in the brains of aborted lambs (18·9%). There was no significant relationship betweenN. caninumandT. gondiico-infection. Investigation of the tissue distribution ofNeospora, in aborted lambs, showed thatNeosporacould not be detected in tissues other than brain and this was in contrast toToxoplasmawhere the parasite could be frequently detected in a range of tissues.

Estimating nitrate retention in a large constructed wetland using high-frequency, continuous monitoring and hydrologic modeling

2017 ◽  
Author(s):  
Chad W Drake ◽  
Christopher S Jones ◽  
Keith E Schilling ◽  
Antonio Arenas Amado ◽  
Larry J Weber
Keyword(s):  
Constructed Wetland ◽  
High Frequency ◽  
Continuous Monitoring ◽  
Hydrologic Modeling ◽  
Nitrate Retention

scholarly journals A Naturally Occurring Deletion in FliE from Salmonella enterica Serovar Dublin Results in an Aflagellate Phenotype and Defective Proinflammatory Properties

2017 ◽  
Vol 86 (1) ◽  
Author(s):  
Sebastián Sasías ◽  
Adriana Martínez-Sanguiné ◽  
Laura Betancor ◽  
Arací Martínez ◽  
Bruno D'Alessandro ◽  
...  
Keyword(s):  
Amino Acids ◽  
Dna Sequences ◽  
High Frequency ◽  
Salmonella Enterica ◽  
Wild Type ◽  
Content Type ◽  
Naturally Occurring ◽  
Salmonella Enterica Serovar Dublin

ABSTRACTSalmonella entericaserovar Dublin is adapted to cattle but is able to infect humans with high invasiveness. An acute inflammatory response at the intestine helps to preventSalmonelladissemination to systemic sites. Flagella contribute to this response by providing motility and FliC-mediated signaling through pattern recognition receptors. In a previous work, we reported a high frequency (11 out of 25) ofS. Dublin isolates lacking flagella in a collection obtained from humans and cattle. The aflagellate strains were impaired in their proinflammatory propertiesin vitroandin vivo. The aim of this work was to elucidate the underlying cause of the absence of flagella inS. Dublin isolates. We report here that class 3 flagellar genes are repressed in the human aflagellate isolates, due to impaired secretion of FliA anti-sigma factor FlgM. This phenotype is due to an in-frame 42-nucleotide deletion in thefliEgene, which codes for a protein located in the flagellar basal body. The deletion is predicted to produce a protein lacking amino acids 18 to 31. The aflagellate phenotype was highly stable; revertants were obtained only whenfliAwas artificially overexpressed combined with several successive passages in motility agar. DNA sequence analysis revealed that motile revertants resulted from duplications of DNA sequences infliEadjacent to the deleted region. These duplications produced a FliE protein of similar length to the wild type and demonstrate that amino acids 18 to 31 of FliE are not essential. The same deletion was detected inS. Dublin isolates obtained from cattle, indicating that this mutation circulates in nature.

High frequency of antigenic variants among naturally occurring human Coxsackie B4 virus isolates identified by monoclonal antibodies

Nature ◽  
1982 ◽  
Vol 300 (5890) ◽  
pp. 374-376 ◽  
Author(s):  
Bellur S. Prabhakar ◽  
Martin V. Haspel ◽  
Patrick R. McClintock ◽  
Abner Louis Notkins
Keyword(s):  
Monoclonal Antibodies ◽  
High Frequency ◽  
Naturally Occurring ◽  
Coxsackie B4 Virus ◽  
Virus Isolates

scholarly journals Continuous Monitoring of Differential Reflectivity Bias for C-Band Polarimetric Radar Using Online Solar Echoes in Volume Scans

2019 ◽  
Vol 11 (22) ◽  
pp. 2714
Author(s):  
Chu ◽  
Liu ◽  
Zhang ◽  
Kou ◽  
Li
Keyword(s):  
High Frequency ◽  
Continuous Monitoring ◽  
Information Science ◽  
Elevation Angle ◽  
Gaussian Model ◽  
Likelihood Estimation ◽  
Polarimetric Radar ◽  
Time Calibration ◽  
Calibration Methods ◽  
Differential Reflectivity

The measurement error of differential reflectivity (ZDR), especially systematic ZDR bias, is a fundamental issue for the application of polarimetric radar data. Several calibration methods have been proposed and applied to correct ZDR bias. However, recent studies have shown that ZDR bias is time-dependent and can be significantly different on two adjacent days. This means that the frequent monitoring of ZDR bias is necessary, which is difficult to achieve with existing methods. As radar sensitivity has gradually been enhanced, large amounts of online solar echoes have begun to be observed in volume-scan data. Online solar echoes have a high frequency, and a known theoretical value of ZDR (0 dB) could thus allow the continuous monitoring of ZDR bias. However, online solar echoes are also affected by low signal-to-noise ratio and precipitation attenuation for short-wavelength radar. In order to understand the variation of ZDR bias in a C-band polarimetric radar at the Nanjing University of Information Science and Technology (NUIST-CDP), we analyzed the characteristics of online solar echoes from this radar, including the daily frequency of occurrence, the distribution along the radial direction, precipitation attenuation, and fluctuation caused by noise. Then, an automatic method based on online solar echoes was proposed to monitor the daily ZDR bias of the NUIST-CDP. In the proposed method, a one-way differential attenuation correction for solar echoes and a maximum likelihood estimation using a Gaussian model were designed to estimate the optimal daily ZDR bias. The analysis of three months of data from the NUIST-CDP showed the following: (1) Online solar echoes occurred very frequently regardless of precipitation. Under the volume-scan mode, the average number of occurrences was 15 per day and the minimum number was seven. This high frequency could meet the requirements of continuous monitoring of the daily ZDR bias under precipitation and no-rain conditions. (2) The result from the proposed online solar method was significantly linearly correlated with that from the vertical pointing method (observation at an elevation angle of 90°), with a correlation coefficient of 0.61, suggesting that the proposed method is feasible. (3) The day-to-day variation in the ZDR bias was relatively large, and 32% of such variations exceeded 0.2 dB, meaning that a one-time calibration was not representative in time. Accordingly, continuous calibration will be necessary. (4) The ZDR bias was found to be largely influenced by the ambient temperature, with a large negative correlation between the ZDR bias and the temperature.

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