Analysis of US Fracturing-Fluids Trends Offers Insight Into Changes Over Time

В статье представлены результаты археоботанических исследований в Московском Кремле и обсуждается проблема использования растений жителями города с особым акцентом на потреблении зерновой продукции. Материалы рассматриваются по двум хронологическим выборкам (XII - перв. пол. XIII в. и втор. пол. XIII - XV в.), что позволяет проследить динамику изменения археоботанических спектров. Выделяются три специфические черты, характеризующие коллекцию зерновых в Москве. Во-первых, высокая насыщенность зерном культурного слоя во-вторых, стабильно высокий показатель доли ржи на протяжении столетий (ок. 70 ) и, в-третьих, остающийся непонятным факт сокращения на 10 доли овса в поздней выборке. Последнее, по мнению авторов, противоречит логике развития города, требующей увеличения фуражных запасов для лошадей - основного транспортного средства средневековья. Авторы приходят к выводу, что при отсутствии или скудости находок экзотических растений, выступающих маркерами элитного питания в европейских городах, в средневековой Руси в этом качестве могут интерпретироваться обычные зерновые культуры, в частности - мягкая пшеница. The paper presents the results of archaeobotanical studies in the Moscow Kremlin and discusses the use of plants by the city residents with a focus on consumption of crops. The analysis is based on two chronological selections (the 12th - first half of the 13th centuries and the first half of the 13th - 15th centuries) it gives an insight into the changes over time of archaeobotanical spectra. Three specific features characterizing the crop grains in Moscow are singled out. Firstly, abundance of crop plants in the occupation layers secondly, consistently high values of the rye share in total crops throughout centuries (around 70 ) and, thirdly, the reduction in the share of oats by 10 in the later sample for some inexplicable reasons. In the view of the authors, the latter fact contradicts the logical development of the city that required increase in forage reserves for horses which was the main animal for transportation in the medieval times. The authors come to the conclusion that in the absence or scarcity of exotic plant finds used as markers of luxury food in European cities, common grain crops such as bread wheat can be used as elite food indicator in Medieval Russia.

Download Full-text

Comparison and Transition of Research Focus on Application of IT in Education

International Journal of Information and Communication Technology Education ◽

10.4018/ijicte.288545 ◽

2022 ◽

Vol 18 (1) ◽

pp. 0-0

Keyword(s):

Information Technology ◽

Research Trends ◽

Empirical Methods ◽

Research Focus ◽

Keyword Analysis ◽

Dynamic Character ◽

Changing Trends ◽

Changes Over Time ◽

Insight Into ◽

Over Time

The application of Information Technology (IT) in education has opened new scenarios for this ancient process. With rapidly changing field of IT, the adoption of IT in education has been changed drastically. It is quite difficult for researchers to keep pace with changing research trends. An analysis based on the keywords could provide a synopsis on the use of IT in education. The keywords can be extracted and clustered to draw a sketch of trend changes over time. In this paper, we propose two empirical methods based on classic TF/IDF, i.e., overall rating (OR) and dynamic character (DC) of a keyword for in-depth keyword analysis to examine changing trends in research. The method help in disclosing time based changes in research focuses by comparing TF/IDF weights of keywords in different years. A total of 8131 scholarly articles from 12 well recognized journals were used in this analysis. The analysis shows that proposed methods provide sufficient insight into the research trends of application of IT in education in 11 years, i.e., 2007-2017.

Download Full-text

Kinship dynamics: patterns and consequences of changes in local relatedness

Proceedings of The Royal Society B Biological Sciences ◽

10.1098/rspb.2021.1129 ◽

2021 ◽

Vol 288 (1957) ◽

pp. 20211129

Author(s):

Darren P. Croft ◽

Michael N. Weiss ◽

Mia L. K. Nielsen ◽

Charli Grimes ◽

Michael A. Cant ◽

...

Keyword(s):

Life History ◽

Social Evolution ◽

Inclusive Fitness ◽

Natural Populations ◽

Life History Evolution ◽

The Mean ◽

The Individual ◽

Changes Over Time ◽

Insight Into ◽

Over Time

Mounting evidence suggests that patterns of local relatedness can change over time in predictable ways, a process termed kinship dynamics. Kinship dynamics may occur at the level of the population or social group, where the mean relatedness across all members of the population or group changes over time, or at the level of the individual, where an individual's relatedness to its local group changes with age. Kinship dynamics are likely to have fundamental consequences for the evolution of social behaviour and life history because they alter the inclusive fitness payoffs to actions taken at different points in time. For instance, growing evidence suggests that individual kinship dynamics have shaped the evolution of menopause and age-specific patterns of helping and harming. To date, however, the consequences of kinship dynamics for social evolution have not been widely explored. Here we review the patterns of kinship dynamics that can occur in natural populations and highlight how taking a kinship dynamics approach has yielded new insights into behaviour and life-history evolution. We discuss areas where analysing kinship dynamics could provide new insight into social evolution, and we outline some of the challenges in predicting and quantifying kinship dynamics in natural populations.

Download Full-text

500 days of Thingiverse: a longitudinal study of 30 popular things for 3D printing

Rapid Prototyping Journal ◽

10.1108/rpj-01-2020-0021 ◽

2020 ◽

Vol 26 (10) ◽

pp. 1723-1731

Author(s):

James I. Novak

Keyword(s):

Design Methodology ◽

Digital Music ◽

Music Video ◽

Content Type ◽

Exclusive Group ◽

Changes Over Time ◽

Practical Implications ◽

Insight Into ◽

Significant Attention ◽

Over Time

Purpose The purpose of this paper is to provide insight into the way object data on Thingiverse changes over time, analyzing the relationships among views, downloads, likes, makes, remixes and comments over 500 days. Design/methodology/approach In total, 30 of the most popular things on Thingiverse were tracked between August 26, 2018 and January 7, 2020, with data collected about the different interactions at five intervals. Findings Highlights include: “#3DBenchy” became the first thing to reach one million downloads during this study. The “Xbox One controller mini wheel” achieved the highest documented download rate of 698 downloads per day. The average conversion rate from downloads to makes for all 30 things was one make for every 474 downloads at the start of the study, declining to one make for every 784 downloads by the conclusion. Research limitations/implications With over 1.6 million things on Thingiverse, this study focused on an exclusive group of things that have gained significant attention from makers and does not represent most things on the platform. Practical implications Although often considered a novelty or niche maker community, this research shows that things on Thingiverse are achieving popularity comparable to digital music, video and imagery, and a large ecosystem of things has been growing that has implications for designers, manufacturers, supply chain managers and universal popular culture. Originality/value This is the first study to track the digital behaviors of 3D printable things over time, revealing new knowledge about how people interact with content and the scale of these interactions.

Download Full-text

Comparison of two devices for measuring exercise transcutaneous oxygen pressures in patients with claudication

VASA ◽

10.1024/0301-1526/a000454 ◽

2015 ◽

Vol 44 (5) ◽

pp. 355-362 ◽

Cited By ~ 8

Author(s):

Marie Urban ◽

Alban Fouasson-Chailloux ◽

Isabelle Signolet ◽

Christophe Colas Ribas ◽

Mathieu Feuilloy ◽

...

Keyword(s):

Oxygen Pressure ◽

Optical Sensors ◽

Chemical Sensors ◽

Transcutaneous Oxygen ◽

Starting Values ◽

Two Systems ◽

Transcutaneous Oxygen Pressure ◽

New Sensors ◽

Changes Over Time ◽

Over Time

Abstract. Summary: Background: We aimed at estimating the agreement between the Medicap® (photo-optical) and Radiometer® (electro-chemical) sensors during exercise transcutaneous oxygen pressure (tcpO2) tests. Our hypothesis was that although absolute starting values (tcpO2rest: mean over 2 minutes) might be different, tcpO2-changes over time and the minimal value of the decrease from rest of oxygen pressure (DROPmin) results at exercise shall be concordant between the two systems. Patients and methods: Forty seven patients with arterial claudication (65 + / - 7 years) performed a treadmill test with 5 probes each of the electro-chemical and photo-optical devices simultaneously, one of each system on the chest, on each buttock and on each calf. Results: Seventeen Medicap® probes disconnected during the tests. tcpO2rest and DROPmin values were higher with Medicap® than with Radiometer®, by 13.7 + / - 17.1 mm Hg and 3.4 + / - 11.7 mm Hg, respectively. Despite the differences in absolute starting values, changes over time were similar between the two systems. The concordance between the two systems was approximately 70 % for classification of test results from DROPmin. Conclusions: Photo-optical sensors are promising alternatives to electro-chemical sensors for exercise oximetry, provided that miniaturisation and weight reduction of the new sensors are possible.

Download Full-text