scholarly journals AMS 14C Dating Using Black Pottery and Fiber Pottery

Radiocarbon ◽  
2004 ◽  
Vol 46 (1) ◽  
pp. 407-412 ◽  
Author(s):  
Shozo Mihara ◽  
Kazuo Miyamoto ◽  
Hidefumi Ogawa ◽  
Teiji Kurosaka ◽  
Toshio Nakamura ◽  
...  
Keyword(s):  
Alkali Treatment ◽  
Sample Selection ◽  
The Philippines ◽  
Carbonaceous Materials ◽  
Chemical Pretreatment ◽  
Carbon Yield ◽  
14C Dating ◽  
Modified Method ◽  
Pottery Sample ◽  
Selection Of

A technique of accelerator mass spectrometry (AMS) has made it possible to directly measure radiocarbon ages of pottery by isolating organic materials sealed in the pottery when the pottery was formed. We analyzed the carbon contents and 14C ages for “black pottery” from the Philippines and “fiber pottery” from Japan using the relevant carbonaceous materials extracted from the pottery samples, i.e., adhered chaff or grass fibers that were incorporated in the pottery matrix, respectively. The carbon yield of the pottery sample varied largely depending on the pottery types, the preservation conditions, as well as the chemical pretreatment methods to purify carbonaceous materials for 14C dating. We will discuss criteria for sample selection of well-preserved pottery, and a modified method, instead of the standard alkali treatment, to obtain sufficient material for precise 14C dating.

scholarly journals The impact of the health condition of oaks from the Krotoszyn Plateau on the mechanical properties of timber structures

2015 ◽  
Vol 57 (4) ◽  
pp. 224-232
Author(s):  
Jarosław Siwiński ◽  
Katarzyna Kubiak ◽  
Miłosz Tkaczyk ◽  
Anna Mazur ◽  
Ryszard Rekucki
Keyword(s):  
Mechanical Properties ◽  
Health Condition ◽  
Health State ◽  
Timber Structures ◽  
Strength Parameters ◽  
Modified Method ◽  
Strength Tests ◽  
Prior Selection ◽  
The Impact ◽  
Selection Of

Abstract The study was conducted to perform a comparative analysis of the mechanical properties of wood samples derived from oaks in the Krotoszyn Plateau, which depend on the health state of the trees. Strength parameters of oak wood were calculated for selected diseased and healthy trees (according to the Roloff classification). The study was conducted by a modified method described in the standard Polish Norm PN EN 408+ A1: 2012. For testing, prior selection of wood samples showed that more wood samples of diseased trees compared with those of healthy oaks did not fulfil the Polish standard requirements. According to the method used, the average results of strength tests of timber structures from healthy oaks exhibited higher strength parameters than those of the diseased trees.

Sample selection of prognostics validation test based on multi-stage Wiener process

2018 ◽  
Vol 233 (4) ◽  
pp. 605-614
Author(s):  
Zhiao Zhao ◽  
Yong Zhang ◽  
Guanjun Liu ◽  
Jing Qiu
Keyword(s):  
Wiener Process ◽  
Process Model ◽  
Failure Modes ◽  
Early Stage ◽  
Sample Selection ◽  
Degradation Process ◽  
Time Interval ◽  
Degradation Data ◽  
Multi Stage ◽  
Selection Of

Sample allocation and selection technology is of great significance in the test plan design of prognostics validation. Considering the existing researches, the importance of prognostics samples of different moments is not considered in the degradation process of a single failure. Normally, prognostics samples are generated under the same time interval mechanism. However, a prognostics system may have low prognostics accuracy because of the small quantity of failure degradation and measurement randomness in the early stage of a failure degradation process. Historical degradation data onto equipment failure modes are collected, and the degradation process model based on the multi-stage Wiener process is established. Based on the multi-stage Wiener process model, we choose four parameters to describe different degradation stages in a degradation process. According to four parameters, the sample selection weight of each degradation stage is calculated and the weight of each degradation stage is used to select prognostics samples. Taking a bearing wear fault of a helicopter transmission device as an example, its degradation process is established and sample selection weights are calculated. According to the sample selection weight of each degradation process, we accomplish the prognostics sample selection of the bearing wear fault. The results show that the prognostics sample selection method proposed in this article has good applicability.

scholarly journals Self Esteem and General Well Being in Adolescents with Low vs High Emotional Competence

2017 ◽  
Vol 4 (4) ◽  
Author(s):  
Sarvdeep Kohli ◽  
Anjali Malik ◽  
Varsha Rani
Keyword(s):  
Emotional Competence ◽  
Sample Selection ◽  
Well Being ◽  
Self Esteem ◽  
The Self ◽  
Successful Development ◽  
Emotional Evaluation ◽  
Competence Scale ◽  
Age Range ◽  
Selection Of

An essential component of youths’ successful development is learning to appropriately respond to emotions, including the ability to recognize, identify and describe one’s feelings. Emotional competence refers to one’s ability to express or release one’s inner feelings or emotions. Self-esteem reflects a person’s overall subjective emotional evaluation of his or her own worth. It is a judgment of oneself as well as an attitude toward the self. General well being refers to the harmonious functioning of the physical as well as psychological aspects of the personality, giving satisfaction to the self and benefit to the society. The present study focuses on the self esteem and general well being in adolescents with low vs high emotional competence. For this purpose, first of all emotional competence scale was administered on 260 adolescents within the age range of 15-18 years, to identify the low emotionally competent and high emotionally competent adolescents. After the sample selection of 152 subjects (76 low emotionally competent and 76 high emotionally competent) Rosenberg’s Self-esteem scale and General well being scale were administered. Results indicate that high emotionally competent adolescents have high self-esteem and better general well being than low emotionally competent adolescents.

scholarly journals PENGARUH PROFITABILITAS, SOLVABILITAS, DAN OPINI AUDIT TERHADAP KETEPATAN WAKTU PENYAMPAIAN LAPORAN KEUANGAN (TIMELINESS) DENGAN KUALITAS AUDITOR SEBAGAI VARIABEL MODERATING

2017 ◽  
Vol 8 (2) ◽  
pp. 122-139
Author(s):  
Thia Margaretha Tarigan
Keyword(s):  
Sampling Method ◽  
Stock Exchange ◽  
Sample Selection ◽  
Secondary Data ◽  
Manufacturing Companies ◽  
Statistical Tool ◽  
Audit Opinion ◽  
Auditor Quality ◽  
Logistic Regressions ◽  
Selection Of

This research aims to verify and provide empirical evidences about: the effect of Profitability, Solvability, and Audit Opinion to Timeliness with Auditor Quality as moderating variabel of manufacturing companies in Indonesia Stock Exchange. The population of this research are 138 manufacturing companies in Indonesia Stock Exchange (BEI) since 2010 – 2014. Sample selection of this research use purposive sampling method. The sample of this research are 78 manufacturing companies. Type of data used are secondary data, that collected by documentation. Statistical tool used is logistic regressions analysis. The result of this research concluded that only profitability have positive significant to timeliness while solvability and audit opinion have not significant to timeliness. Auditor quality as moderating variabel has not strengthened the correlation between profitability, and audit opinion to timeliness but not weaknessed the correlation between solvability to timeliness.

scholarly journals 14C Dating Compared to Art Historical Dating of Roman and Coptic Textiles from Egypt

Radiocarbon ◽  
2004 ◽  
Vol 46 (1) ◽  
pp. 231-244 ◽  
Author(s):  
Mark Van Strydonck ◽  
Antoine De Moor ◽  
Dominique Bénazeth
Keyword(s):  
Radiocarbon Dating ◽  
Interquartile Range ◽  
14C Dating ◽  
Art Historians ◽  
Representative Selection ◽  
The Individual ◽  
Selection Of ◽  
Individual Objects

A representative selection of Roman and Coptic textiles is used to compare the radiocarbon dating results with the chronology proposed by art historians. In some cases, the comparison was made on individual objects, but in other cases, groups of stylistically and/or technologically related textiles were compared. In the case of the latter, the interquartile range was calculated. The results of this comparison show that some individual samples and groups are dated older than expected, while for another group the opposite is the case. One group was matching well with the presumed period as a whole, but not on the basis of the individual pieces. The analyses showed the necessity of 14C dating to obtain a more accurate dating of Coptic textiles.

scholarly journals Identification, Extraction, and Preparation of Reliable Lime Samples for 14C Dating of Plasters and Mortars with the “Pure Lime Lumps” Technique

Radiocarbon ◽  
2012 ◽  
Vol 54 (3-4) ◽  
pp. 933-942 ◽  
Author(s):  
Giovanni L A Pesce ◽  
Richard J Ball ◽  
Gianluca Quarta ◽  
Lucio Calcagnile
Keyword(s):  
Case Studies ◽  
Radiocarbon Dating ◽  
Historic Sites ◽  
14C Dating ◽  
Relative Simplicity ◽  
Lime Mortars ◽  
The Matrix ◽  
The 1960S ◽  
Selection Of ◽  
Contamination Problem

Radiocarbon dating was first applied to historic lime mortars during the 1960s. However, despite the relative simplicity of the technique in principle, a number of subsequent studies have highlighted important aspects that should be considered. One of the most significant of these challenges arises from sample contamination by carbonaceous substances such as incompletely burnt limestone and aggregates of fossil origin containing “dead” 14C. More recent studies have shown that in the majority of old lime-based mixtures the contamination problem can be avoided through selection of pure lime lumps. These particular types of lumps are believed to originate from areas where the lime is incompletely mixed with the aggregate. It has been demonstrated that even a single lime lump can provide sufficient material for a 14C date of the mortar from which the lump was taken (Pesce et al. 2009). This paper describes the practical challenges associated with location, extraction, and preparation of 4 lime lumps extracted from 2 new sites for 14C dating. These include distinguishing the lime lumps from other lumps present in the matrix and the removal of material surrounding the lime lump. The coherence of 14C dating with other archaeological information on the chronology of historic sites is highlighted through case studies.

scholarly journals Molecular Modeling and In Vitro Studies of a Neutral Oxime as a Potential Reactivator for Acetylcholinesterase Inhibited by Paraoxon

Molecules ◽  
2018 ◽  
Vol 23 (11) ◽  
pp. 2954 ◽  
Author(s):  
Reuel de Paula ◽  
Joyce de Almeida ◽  
Samir Cavalcante ◽  
Arlan Gonçalves ◽  
Alessandro Simas ◽  
...  
Keyword(s):  
Molecular Modeling ◽  
Accurate Method ◽  
Docking Studies ◽  
Theoretical Studies ◽  
Modified Method ◽  
Decision Methods ◽  
In Vitro Inhibition ◽  
Mcdm Method ◽  
Selection Of

The present work aimed to compare the small, neutral and monoaromatic oxime, isatin-3-oxime (isatin-O), to the commercial ones, pralidoxime (2-PAM) and obidoxime, in a search for a new potential reactivator for acetylcholinesterase (AChE) inhibited by the pesticide paraoxon (AChE/POX) as well as a novel potential scaffold for further synthetic modifications. The multicriteria decision methods (MCDM) allowed the identification of the best docking poses of those molecules inside AChE/POX for further molecular dynamic (MD) studies, while Ellman’s modified method enabled in vitro inhibition and reactivation assays. In corroboration with the theoretical studies, our experimental results showed that isatin-O have a reactivation potential capable of overcoming 2-PAM at the initial moments of the assay. Despite not achieving better results than obidoxime, this molecule is promising for being an active neutral oxime with capacity of crossing the blood–brain barrier (BBB), to reactivate AChE/POX inside the central and peripheral nervous systems. Moreover, the fact that isatin-O can also act as anticonvulsant makes this molecule a possible multipotent reactivator. Besides, the MCDM method showed to be an accurate method for the selection of the best docking poses generated in the docking studies.

scholarly journals Design and Validation of the Instrument for the Measurement of Learning and Performance in Football

2020 ◽  
Vol 17 (13) ◽  
pp. 4629 ◽  
Author(s):  
Juan M. García-Ceberino ◽  
Antonio Antúnez ◽  
Sergio J. Ibáñez ◽  
Sebastián Feu
Keyword(s):  
Internal Consistency ◽  
Sample Selection ◽  
Technical Skills ◽  
Qualitative Assessment ◽  
Technical Knowledge ◽  
Review Of The Literature ◽  
Reliable Instrument ◽  
And Performance ◽  
Selection Of ◽  
Learning And Performance

The assessment of tactical-technical knowledge of football is essential to develop optimal and integral teaching processes for students. Therefore, the aim of this study was to design and validate an instrument so that teachers, coaches, and researchers can observe and codify both the tactical behaviors and technical skills performed by the students in the game of football. The design and validation of the instrument were carried out in four phases: a) review of the literature and previous instruments; b) design of the Instrument for the Measurement of Learning and Performance in Football (IMLPFoot). It assesses all the offensive and defensive play actions, with and without the ball, as well as their three components (decision-making, technical execution, and final result); c) sample selection of experts (N = 12); and d) quantitative (Likert-type scale from 1 to 10) and qualitative assessment of degree the pertinence, unambiguity, and importance of each of the 33 items included in the IMLPFoot. Aiken’s V coefficient was used to determine content validity. Likewise, internal consistency was calculated using Cronbach’s α coefficient. The results showed demanding levels of validity (V ≥ 0.77), internal consistency (α = 0.983), inter-rater, and intra-rater reliability. Therefore, it is a valid and reliable instrument that makes possible a complete assessment of football in physical education classes and/or in the sports context (out-of-school football).

The Logic of Sample Selection: Who Represents What?

1983 ◽  
Vol 4 (3) ◽  
pp. 84-96 ◽  
Author(s):  
Barbara K. Keogh ◽  
Donald L. Macmillan
Keyword(s):  
Special Education ◽  
Cluster Analysis ◽  
Sample Selection ◽  
Statistical Procedure ◽  
Education Programs ◽  
Research Findings ◽  
Marker Variables ◽  
Sampling Problems ◽  
Limited Generalizability ◽  
Selection Of

This article focuses on sampling problems related to the use of system-identified subjects in special education research. Differences in school district criteria and procedures for selection of pupils into special education programs for the mildly handicapped have resulted in limited generalizability of research findings across studies. Overlap between samples identified as LD and EMR is particularly noticeable. Suggested approaches to deal with these sampling problems are identified. These include the use of rationally defined subgroups, the statistical procedure of cluster analysis, and marker variables.

Selection of a family planning method: a Philippine example

1972 ◽  
Vol 4 (4) ◽  
pp. 411-425 ◽  
Author(s):  
John A. Ballweg
Keyword(s):  
Family Planning ◽  
Birth Control ◽  
Control Method ◽  
The Philippines ◽  
Sources Of Information ◽  
Ideal Family ◽  
Child Bearing ◽  
National Family Planning ◽  
The Republic ◽  
Selection Of

The sample under consideration in this study was composed of 3445 women who accepted some method of pregnancy prevention after consultation with the National Family Planning organization in the Republic of the Philippines. Subjects were divided into four groups: those women who used an oral contraceptive, women using the IUD, women practising the rhythm method, and those who relied on other methods of birth control.This study attempted to reveal sources of information on family planning and reasons for acceptance of a birth control method, as well as the woman's actual and ideal family size and the interval since her last pregnancy. In addition, the relationship between the woman's educational level and the type of technique selected and husband's occupation as a correlate of the method chosen were also investigated.The findings appear to suggest, among other things, that women near the end of the child-bearing years were less likely to select one of the more effective methods. Women with large families and those who reported the desire for no additional children tended to favour the more reliable techniques. Surprisingly, the two measures of status failed to reveal significant relationships with the selection of a given technique.

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