scholarly journals Nearshore Wave Dynamics at Mangalia Beach Simulated by Spectral Models

2019 ◽  
Vol 7 (7) ◽  
pp. 206 ◽  
Author(s):  
Anton ◽  
Rusu ◽  
Anton
Keyword(s):  
Statistical Parameters ◽  
Wave Dynamics ◽  
Spectral Models ◽  
Hydrodynamic Processes ◽  
Southern Side ◽  
Wave Models ◽  
Mike 21 Sw ◽  
The Relationship ◽  
The Waves ◽  
Mike 21

The objective of this paper is to present an integrated picture of the relationship between the waves and the modifications induced by them in the Romanian shoreline. Thus, the hydrodynamic processes at the Mangalia beaches, located in the southern side of the Romanian nearshore, are simulated using the modeling system Mike 21 SW (MIKE 21 Spectral Waves), developed by the Danish Hydration Institute (DHI). This is one of the newest spectral wave models, which can be used for regional- and local-scale simulations. The model has been calibrated and validated using buoy measurements. The analysis of the statistical parameters shows a good match between the model and the observed data. Furthermore, a model to compare the differences that occur on the beach profiles between the cold and warm seasons was developed. The results obtained indicate a reinforcement of the coastal erosion in the winter, when the waves are stronger (especially in January and February).

scholarly journals A new diatom training set for the reconstruction of past water pH in the Tatra Mountain lakes

2021 ◽  
Author(s):  
Elwira Sienkiewicz ◽  
Michał Gąsiorowski ◽  
Ladislav Hamerlík ◽  
Peter Bitušík ◽  
Joanna Stańczak
Keyword(s):  
Surface Sediments ◽  
Tatra Mountains ◽  
Training Set ◽  
Statistical Parameters ◽  
The Past ◽  
Water Ph ◽  
Inferred Ph ◽  
The 1960S ◽  
The Tatra Mountains ◽  
The Relationship

AbstractLakes located in the Polish and Slovak parts of the Tatra Mountains were included in the Tatra diatom database (POL_SLOV training set). The relationship between the diatoms and the water chemistry in the surface sediments of 33 lakes was the basis for the statistical and numerical techniques for quantitative pH reconstruction. The reconstruction of the past water pH was performed using the alpine (AL:PE) and POL_SLOV training sets to compare the reliability of the databases for the Tatra lakes. The results showed that the POL_SLOV training set had better statistical parameters (R2 higher by 0.16, RMSE and max. bias lower by 0.2 and 0.36, respectively) compared to the AL:PE training set. The better performance of the POL_SLOV training set is particularly visible in the case of Przedni Staw Polski where the curve of the inferred water pH shows an opposite trend for the period from the 1960s to 1990 compared to that based on the AL:PE dataset. The reliability of the inferred pH was confirmed by the comparison with current instrumental measurements.

scholarly journals Non-Stationary Flood Frequency Analysis Using Cubic B-Spline-Based GAMLSS Model

Water ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1867
Author(s):  
Chunlai Qu ◽  
Jing Li ◽  
Lei Yan ◽  
Pengtao Yan ◽  
Fang Cheng ◽  
...  
Keyword(s):  
Quantile Regression ◽  
Frequency Analysis ◽  
Flood Frequency ◽  
Flood Frequency Analysis ◽  
Design Flood ◽  
Statistical Parameters ◽  
B Spline ◽  
Quantile Regression Model ◽  
Design Values ◽  
The Relationship

Under changing environments, the most widely used non-stationary flood frequency analysis (NFFA) method is the generalized additive models for location, scale and shape (GAMLSS) model. However, the model structure of the GAMLSS model is relatively complex due to the large number of statistical parameters, and the relationship between statistical parameters and covariates is assumed to be unchanged in future, which may be unreasonable. In recent years, nonparametric methods have received increasing attention in the field of NFFA. Among them, the linear quantile regression (QR-L) model and the non-linear quantile regression model of cubic B-spline (QR-CB) have been introduced into NFFA studies because they do not need to determine statistical parameters and consider the relationship between statistical parameters and covariates. However, these two quantile regression models have difficulties in estimating non-stationary design flood, since the trend of the established model must be extrapolated infinitely to estimate design flood. Besides, the number of available observations becomes scarcer when estimating design values corresponding to higher return periods, leading to unreasonable and inaccurate design values. In this study, we attempt to propose a cubic B-spline-based GAMLSS model (GAMLSS-CB) for NFFA. In the GAMLSS-CB model, the relationship between statistical parameters and covariates is fitted by the cubic B-spline under the GAMLSS model framework. We also compare the performance of different non-stationary models, namely the QR-L, QR-CB, and GAMLSS-CB models. Finally, based on the optimal non-stationary model, the non-stationary design flood values are estimated using the average design life level method (ADLL). The annual maximum flood series of four stations in the Weihe River basin and the Pearl River basin are taken as examples. The results show that the GAMLSS-CB model displays the best model performance compared with the QR-L and QR-CB models. Moreover, it is feasible to estimate design flood values based on the GAMLSS-CB model using the ADLL method, while the estimation of design flood based on the quantile regression model requires further studies.

scholarly journals QSAR studies on imidazoles and sulfonamides as antidiabetic agents

2019 ◽  
Vol 30 (1) ◽  
pp. 5-13
Author(s):  
Veerasamy Ravichandran ◽  
Rajak Harish
Keyword(s):  
Predictive Power ◽  
Partial Least Square ◽  
Least Square ◽  
Antidiabetic Activity ◽  
Statistical Parameters ◽  
Qsar Studies ◽  
2D Qsar ◽  
Partial Least Square Analysis ◽  
Qsar Models ◽  
The Relationship

Abstract The main objective of the present study was to establish significant and validated QSAR models for imidazoles and sulfonamides to explore the relationship between their physicochemical properties and antidiabetic activity. Two dimensional QSAR models had been developed by multiple linear regression and partial least square analysis methods, and then validated for internal and external predictions. The established 2D QSAR models were statistically significant and highly predictive. The validation methods provided significant statistical parameters with q2 > 0.5 and pred_r2 > 0.6, which proved the predictive power of the models. The developed 2D QSAR models revealed the significance of SlogP and T_N_O_5, and Mol.Wt and SsBrE-index properties of imidazoles and sulfonamides on their antidiabetic activity, respectively. These results should prove to be an essential guide for the further design and development of new imidazoles and sulfonamides having better antidiabetic activity.

Fit perceptions, work engagement, satisfaction and commitment

2019 ◽  
Vol 34 (6) ◽  
pp. 401-414
Author(s):  
Bruce Rayton ◽  
Zeynep Y. Yalabik ◽  
Andriana Rapti
Keyword(s):  
Work Engagement ◽  
Affective Commitment ◽  
Employee Attitudes ◽  
The Novel ◽  
Content Type ◽  
Organizational Interventions ◽  
Units Of Analysis ◽  
Time Lagged ◽  
The Relationship ◽  
The Waves

Purpose The purpose of this paper is to explore the relationship between fit (organization and job) perceptions and work engagement (WE). Design/methodology/approach The authors deployed a two-wave survey among 377 clerical employees of the specialist lending division of a large UK bank, with the waves separated by 12 months. Findings The results show a positive relationship between person organization (PO) and person job (PJ) fit perceptions (at Time 1) and WE (at Time 2). Job satisfaction (JS) and affective commitment (AC) dual-mediate these relationships. The effect of PO fit on WE manifests primarily via AC, while the effect of PJ fit manifests primarily via JS. Practical implications The study indicates that organizations should consider the fit of employees to their jobs and the organization when designing interventions intended to increase WE. Also, potential synergies exist between organizational interventions designed to influence employee attitudes focused on similar units of analysis: e.g., PJ fit with JS or PO fit with AC. Originality/value This study provides the first investigation of the dual-mediation, via JS and AC, of the effects of both PJ and PO fit on WE. Furthermore, the use of a time-lagged design strengthens the evidence for the novel hypotheses of this study and enables verification of findings in the extant literature.

Rhetoric and Feminism

2014 ◽  
pp. 582-598
Author(s):  
Cheryl Glenn ◽  
Andrea A. Lunsford
Keyword(s):  
Writing Studies ◽  
Third Wave ◽  
Rhetorical Tradition ◽  
Rhetorical Studies ◽  
Feminist Theories ◽  
Per Se ◽  
Relationship Of ◽  
Feminist Movements ◽  
The Relationship ◽  
The Waves

Until recently, women have been neglected as subjects of scholarly interest in rhetorical studies. Though women were writing and speaking, they have not, for the most part, been considered rhetors per se. This chapter traces the relationship of rhetoric to feminist movements (first-, second-, and third-wave feminism), demonstrating the multiple ways feminism and rhetoric have come to establish a mutually enhancing relationship. The chapter locates four means through which feminist rhetoricians enact social, academic, and political change: resistant rereadings of treatises from the rhetorical canon; recovering and recuperating female-authored texts and performances; constructing feminist theories and rhetorical practices; and extrapolating theories from texts not usually thought of as rhetorical. This summary demonstrates that scholars of rhetoric and writing studies have been riding the waves of feminisms, struggling to resist, resee, and reshape the rhetorical tradition in ways that admit, embrace, and celebrate women and feminist understandings.

Anthropological Fictions: On Character, Culture, and Sexuality in the Work of Margaret Mead, Ruth Benedict, and Virginia Woolf

Prospects ◽  
2005 ◽  
Vol 30 ◽  
pp. 363-382
Author(s):  
Kimberly Engber
Keyword(s):  
Virginia Woolf ◽  
Columbia University ◽  
Franz Boas ◽  
Subsequent Response ◽  
Vassar College ◽  
Margaret Mead ◽  
The Aesthetic ◽  
The Relationship ◽  
The Waves ◽  
Ruth Benedict

In January 1932, anthropologist Ruth Benedict writes a letter to her colleague Margaret Mead on fieldwork in New Guinea, bringing Mead up to date on the health of “Papa” Franz Boas. Boas, the academic mentor that Benedict and Mead shared at Columbia University, acts as only the momentary locus for their continuing exchange about life and work and the relationship between the two. After giving “her hospital report,” Benedict turns eagerly to another conversation with Mead, asking, “Did you likeThe Waves? And did you keep thinking how you'd set down everybody you knew in a similar fashion? I did. I suppose I'm disappointed that she didn't include any violent temperaments, and I want my group of persons to be more varied” (Mead,Anthropologist at Work, 318). Focusing on the depiction of characters in Virginia Woolf's 1931 novelThe Waves, Benedict presents modernist fiction as a model for ethnography. However, she completely avoids the literary termcharacterin her discussion of Woolf, a particularly odd omission since Benedict had majored in English at Vassar College and since she and Mead regularly exchanged novels and their own poetry in letters.Ruth Benedict's reading ofThe Waveshas been cited as evidence of her tendency toward a vaguely “poetic” anthropology, an argument that tends to separate the aesthetic from the sociopolitical in both Benedict and Woolf. In this essay, I consider Benedict's reading of Woolf, together with Margaret Mead's subsequent response, as evidence of a shared critical engagement with character, culture, and sexuality in the early 20th century.

scholarly journals RESEARCH OF RAILWAY AGGREGATE SUB-BALLAST MIXTURE PROPERTIES / GELEŽINKELIO POBALASTINIO SLUOKSNIO IŠ UŽPILDŲ MIŠINIO SAVYBIŲ TYRIMAS

2016 ◽  
Vol 7 (5) ◽  
pp. 540-545
Author(s):  
Deividas Navikas ◽  
Henrikas Sivilevičius
Keyword(s):  
Water Permeability ◽  
Load Distribution ◽  
Laboratory Tests ◽  
Road Construction ◽  
Coefficient Of Determination ◽  
Road Maintenance ◽  
Statistical Parameters ◽  
Minimum Number ◽  
The Relationship ◽  
Representative Samples

Railway sub-ballast layer is a connecting layer between the ballast and other track layers. This layer must ensure even load distribution into the subgrade, drainage surface water, prevent materials of layers mixing. Ensuring these properties allows to extend the explotation of all railway road construction and geometrical parameter of road maintenance. This article analyzes investigated railway sub-ballast mixture properties from large sample sizes (n = 49): gradation, water permeability and density statistical parameters. The regression equation showing the relationship between the fully percent passing through sieves averages and standard deviations is presented. Her coefficient of determination (R2 = 0.909). The minimum number of representative samples of these three properties research is determined. Irregularity in most cases of water permeability (ν = 88,3%), depending on the laboratory tests methodology errors, is indicated. Geležinkelio pobalastinis sluoksnis yra jungiamasis sluoksnis tarp balasto ir grunto sluoksnių. Šis sluoksnis turi užtikrinti tolygų apkrovos perdavimą į sankasą, nudrenuoti paviršinį vandenį, neleisti maišytis sluoksnių medžiagoms. Šių savybių užtikrinimas leidžia prailginti visos kelio konstrukcijos eksploataciją ir geometrinių kelio parametrų išlaikymą. Šiame straipsnyje yra analizuojamos užpildų mišinio, naudojamo geležinkelio pobalastiniame sluoksnyje, iš didelės imties (n = 49) gautos savybės: granuliometrinės sudėties, pralaidumo vandeniui ir tankio statistiniai parametrai. Pateikta granuliometrinės sudėties regresijos lygtis, rodanti sąsają tarp pilnutinių išbirų per sietus vidurkių ir standartinių nuokrypių. Jos determinacijos koeficientas R2 = 0.909. Apskaičiuoti reprezentatyvūs minimalūs bandinių skaičiai šioms trims savybėms tirti. Gauta, kad pralaidumo vandeniui savybė yra labiausiai nevienoda dėl laboratorinių tyrimų metodikos paklaidų, variacijos koeficientas (88,3 %).

scholarly journals The relationship between the compressive strength and ultrasonic pulse velocity concrete with fibers exposed to high temperatures

2018 ◽  
Vol 3 (1) ◽  
pp. 31
Author(s):  
Belaribi Hassiba ◽  
Mellas Mekki ◽  
Rahmani Fraid
Keyword(s):  
Compressive Strength ◽  
Ultrasonic Velocity ◽  
High Temperatures ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Cement Ratio ◽  
Compressive Strength Of Concrete ◽  
The Relationship ◽  
The Waves

The paper analyses the effects of high temperatures on the concrete residual strength using ultrasonic velocity (UPV). An experimental investigation was conducted to study the relationship between UPV residual data and compressive strength of concrete with different mixture proportions, cubic specimens with water-cement ratio of 0.35. They were heated in an electric furnace at temperatures ranging from 200°C to 600°C. In this experiment a comparison was made between the four groups which include two types of fibers steel 0,19%, 0,25% and 0,5%, polypropylene: 0,05%, 0,11% 0,16 % by volume. Cube specimens were tested in order to determine ultrasonic velocity. The compressive strength was tested too. According to the results, relations were established between ultrasonic velocity in the specimens and the compressive strength at different temperature and the range of the velocity of the waves were also determined for this kind of concrete. Result of the test showed that UPV test can be successfully used in order to verify the consistency of structures damaged by fire.

Sign in / Sign up

Export Citation Format

Share Document