Exploring Growth Trajectories of Informal and Formal Mathematics Skills Among Prekindergarten Children Struggling With Mathematics

2018 ◽  
Vol 42 (2) ◽  
pp. 80-91
Author(s):  
Jessica M. Namkung ◽  
Peng Peng ◽  
J. Marc Goodrich ◽  
Victoria Molfese
Keyword(s):  
Growth Rate ◽  
Growth Trajectories ◽  
Typically Developing ◽  
Early Mathematics ◽  
Mathematics Skills ◽  
Informal Mathematics ◽  
Mathematics Difficulties ◽  
Formal Mathematics ◽  
Mathematics Knowledge ◽  
Over Time

Growth in two subscales, Informal and Formal Mathematics Skills, of the Test of Early Mathematics Abilitity–3 (TEMA-3) was explored in a sample of 281 children. Children were identified as either typically developing (TYP; n = 205) or having mathematics difficulties (MD; n = 76) based on their total TEMA-3 score at the end of prekindergarten. Their average level of informal and formal mathematics skills, growth rate over time, and rate of acceleration of growth were estimated using conventional growth modeling while controlling for the effects of gender. Results indicated that children with MD had significantly lower informal and formal mathematics knowledge than did TYP children at the end of kindergarten. However, for informal mathematics skills, children with MD grew at a significantly faster rate than did TYP children, and the rate of acceleration was also significantly faster for children with MD. In contrast, both the rate of growth and acceleration of growth in formal mathematics skills were significantly faster for TYP children than they were for children with MD. Implications for early MD identification and interventions are discussed.

Why do early mathematics skills predict later reading? The role of mathematical language.

2017 ◽  
Vol 53 (9) ◽  
pp. 1633-1642 ◽  
Author(s):  
David J. Purpura ◽  
Jessica A. R. Logan ◽  
Brenna Hassinger-Das ◽  
Amy R. Napoli
Keyword(s):  
Mathematical Language ◽  
Early Mathematics ◽  
Mathematics Skills

Decomposition of Growth Curves into Growth Rate and Acceleration: a Novel Procedure to Monitor Bacterial Growth and the Time-Dependent Effect of Antimicrobials

2021 ◽  
Author(s):  
M. Luisa Navarro-Pérez ◽  
M. Coronada Fernández-Calderón ◽  
Virginia Vadillo-Rodríguez
Keyword(s):  
Growth Rate ◽  
Mathematical Models ◽  
Bacterial Growth ◽  
Time Course ◽  
Antimicrobial Agents ◽  
Numerical Procedure ◽  
Growth Curves ◽  
Predictive Microbiology ◽  
Insight Into ◽  
Over Time

In this paper, a simple numerical procedure is presented to monitor the growth of Streptococcus sanguinis over time in the absence and presence of propolis, a natural antimicrobial. In particular, it is shown that the real-time decomposition of growth curves obtained through optical density measurements into growth rate and acceleration can be a powerful tool to precisely assess a large range of key parameters [ i.e. lag time ( t 0 ), starting growth rate ( γ 0 ), initial acceleration of the growth ( a 0 ), maximum growth rate ( γ max ), maximum acceleration ( a max ) and deceleration ( a min ) of the growth and the total number of cells at the beginning of the saturation phase ( N s )] that can be readily used to fully describe growth over time. Consequently, the procedure presented provides precise data of the time course of the different growth phases and features, which is expected to be relevant, for instance, to thoroughly evaluate the effect of new antimicrobial agents. It further provides insight into predictive microbiology, likely having important implications to assumptions adopted in mathematical models to predict the progress of bacterial growth. Importance: The new and simple numerical procedure presented in this paper to analyze bacterial growth will possibly allow identifying true differences in efficacy among antimicrobial drugs for their applications in human health, food security, and environment, among others. It further provides insight into predictive microbiology, likely helping in the development of proper mathematical models to predict the course of bacterial growth under diverse circumstances.

scholarly journals Suelos Y Karst, Origen De Inundaciones Y Hundimientos En Chetumal, Quintana Roo, México

2018 ◽  
Vol 14 (14) ◽  
pp. 33 ◽  
Author(s):  
Patricia Fragoso-Servón ◽  
Alberto Pereira-Corona
Keyword(s):  
Land Use ◽  
Growth Rate ◽  
Population Growth Rate ◽  
Land Use Changes ◽  
Development Program ◽  
Quintana Roo ◽  
Development Programs ◽  
Mexican Caribbean ◽  
The City ◽  
Over Time

The Mexican Caribbean and its main cities have the highest population growth rate in Mexico. This work goal was to analyze the growth of the city of Chetumal and the geopedological characteristics in which it has been developed, to identify potential hazards and thereby improve development programs. The methodology consisted in the study of geopedological characteristics and the analysis of land use changes in the city over time. The main problems of Chetumal are floods and subsidence. Floods are more common in areas where Gleysols soils are found in low-lying areas. The subsidence is associated to Leptosols with a phreatic mantle at a shallow depth where the precipitations favors dissolution of rock. The extrapolation of the relationships between geopedological conditions and the area occupied by the city, allows us to suppose that areas which the current Urban Development Program proposes for future city expansion will develop the same problems of subsidence and flooding as the areas already built in sites with similar conditions.

scholarly journals Early Mathematics Counts: Promising Instructional Strategies from Low- and Middle-Income Countries

2018 ◽  
Author(s):  
Yasmin Sitabkhan ◽  
Linda M. Platas
Keyword(s):  
Instructional Strategies ◽  
Future Research ◽  
Mathematics Interventions ◽  
Middle Income ◽  
Early Mathematics ◽  
Middle Income Countries ◽  
Informal Mathematics ◽  
Early Grade ◽  
Research And Policy ◽  
Low And Middle Income

This occasional paper examines common instructional strategies in early-grade mathematics interventions through a review of studies in classrooms in low- and middle-income countries. Twenty-four studies met the criteria for inclusion, and analyses reveal four sets of instructional strategies for which there is evidence from multiple contexts. Of the 24 studies, 16 involved the use of multiple representations, 10 involved the use of developmental progressions, 6 included supporting student use of explanation and justification, and 5 included integration of informal mathematics. Based on the review, we provide conclusions and recommendations for future research and policy.

scholarly journals Longitudinal changes in home-based arts engagement during and following the first national lockdown due to the COVID-19 pandemic in the United Kingdom

2021 ◽  
Author(s):  
Feifei Bu ◽  
Hei Wan Mak ◽  
Jessica K Bone ◽  
Daisy Fancourt
Keyword(s):  
Social Study ◽  
Growth Trajectories ◽  
Health Campaigns ◽  
Longitudinal Changes ◽  
Growth Mixture ◽  
Home Based ◽  
Public Health Campaigns ◽  
The Uk ◽  
Arts Engagement ◽  
Over Time

Aims: This study aimed to examine potential heterogeneity in longitudinal changes in home-based arts engagement during the first national lockdown and following gradual easing of restrictions in the UK. Further, it sought to explore factors that were associated with patterns of longitudinal changes in home-based arts engagement. Methods: Data were from the UCL COVID-19 Social Study. The analytical sample consisted of 29,147 adults in the UK who were followed up for 22 weeks from 21st March to 21st August 2020. Data were analysed using growth mixture models. Results: Our analyses identified five classes of growth trajectories. There were two stable classes showing little change in arts engagement over time (64.4% in total), two classes showing initial increases in arts engagement followed by declines as restrictions were eased (29.8%), and one class showing slight declines during strict lockdown followed by an increase in arts engagement after the easing of restrictions (5.9%). A range of factors were found to be associated with class membership of these arts engagement trajectories, such as age, gender, education, income, employment status, and health. Conclusions: There is substantial heterogeneity in longitudinal changes in home-based arts engagement. For participants whose engagement changed over time, growth trajectories of arts engagement were related to changes in lockdown measures. These findings suggest that some individuals may have drawn on the arts when they needed them the most, such as during the strict lockdown period, even if they usually had lower levels of arts engagement before the pandemic. Overall, our results indicate the importance of promoting arts engagement during pandemics and periods of lockdown as part of public health campaigns.

scholarly journals A skeletochronological estimate of age and growth in a large riparian frog from Madagascar (Anura, Mantellidae, Mantidactylus)

Herpetozoa ◽  
2019 ◽  
Vol 32 ◽  
pp. 39-44 ◽  
Author(s):  
Fabio M. Guarino ◽  
Angelica Crottini ◽  
Marcello Mezzasalma ◽  
Jasmin E. Randrianirina ◽  
Franco Andreone
Keyword(s):  
Growth Rate ◽  
Body Size ◽  
Sexual Size Dimorphism ◽  
The Body ◽  
Age And Growth ◽  
Growth Trajectories ◽  
Growth Coefficient ◽  
Size Dimorphism ◽  
Adult Females ◽  
Similar Growth

We characterized the body size (as snout-vent length), age, sexual size dimorphism, and growth rate in a population of one of the larger riparian frog from Madagascar (Mantidactylusgrandidieri) from a rainforest patch close to Vevembe, SE Madagascar. We identified a significant female-biased sexual size dimorphism. Age was estimated using phalangeal skeletochronology and was significantly higher in females than in males. Modal age class turned out to be 4 years in both sexes but a large percentage of adult females (75%) fell in the 5–6 years-old classes, while no male exceeded 4 years. We here report M.grandidieri as a medium-long-lived anuran species. Von Bertalanffy’s model showed similar growth trajectories between the sexes although the growth coefficient in females (k = 0.335) was slightly but not significantly higher than in males (k = 0.329).

The Internationalization of Chinese English-Language Humanities and Social Science Journals

2021 ◽  
Vol 52 (4) ◽  
pp. 273-293
Author(s):  
Ying Huang ◽  
Weishan Miao
Keyword(s):  
Social Sciences ◽  
Growth Rate ◽  
Social Science ◽  
English Language ◽  
Mixed Methods Approach ◽  
Citation Indexes ◽  
The World ◽  
The Status ◽  
Time Type ◽  
Over Time

This paper surveys the status of Chinese English-language journals in the humanities and social sciences (HSS-CELJs). HSS-CELJs are an important vehicle for disseminating Chinese scholarly voices and culture throughout the world. We used a mixed-methods approach to investigate the status of HSS-CELJs according to a number of attributes: growth rate over time, type of publisher, discipline, region of publication, publishing frequency, independence versus co-publication, and inclusion in citation indexes. We discuss some of the challenges facing HSS-CELJ publishing and highlight several contradictions of internationalization in the Chinese context. As of March 2020, eighty-seven HSS-CELJs covered nineteen disciplines, among which economics (17 per cent) and law (13 per cent) accounted for the highest proportions. The establishment of HSS-CELJs has increased significantly since 2004. Fifty-two per cent of HSS-CELJs were jointly operated with international publishers under two different models of cooperation, and twenty-eight (32 per cent) were indexed in international databases.

Effect of intermediate fluid layer on Kelvin–Helmholtz instability

2018 ◽  
Vol 96 (10) ◽  
pp. 1145-1154 ◽  
Author(s):  
Ying Zhang ◽  
Wenqiang Shang ◽  
Mengjun Yao ◽  
Boheng Dong ◽  
Peisheng Li
Keyword(s):  
Growth Rate ◽  
Stokes Equations ◽  
Fluid Layer ◽  
Immiscible Fluids ◽  
Navier Stokes ◽  
Helmholtz Instability ◽  
Flow Configuration ◽  
Front Tracking Method ◽  
Internal Disturbance ◽  
Over Time

Two-dimensional K-H (Kelvin–Helmholtz) instability of the three-component immiscible fluids with an intermediate fluid layer is numerically studied using the front-tracking method (FTM). The instability is governed by the Navier–Stokes equations and the conservation of mass equation for incompressible flow. A finite difference method is used to discretize the governing system. This study focuses on the influence of flow configuration, the thickness of intermediate fluid layer and the distribution of intermediate fluid layer on K-H instability. It is shown that the larger the initial horizontal velocity difference is, the faster the internal disturbance increases, and the characteristic form of K-H instability becomes more obvious for different flow configuration. It is also observed that the thickness of the intermediate fluid layer is negatively correlated to the billow height and the numerical growth rate. In addition, when the intermediate fluid layer is thicker than 0.4 times the disturbance wavelength, the billow height and the numerical growth rate for the K-H instability of the upper and lower interfaces change over time synchronously. The higher the initial height of the lower interface is, the greater the growth rate and billow height of the upper interface are. Besides, the upper and lower interfaces are rolled up synchronously over time when the intermediate fluid layer is symmetrically distributed with y = 0.5 in the fluid system.

scholarly journals Quantitative analysis of cryptocurrencies transaction graph

2019 ◽  
Vol 4 (1) ◽  
Author(s):  
Amir Pasha Motamed ◽  
Behnam Bahrak
Keyword(s):  
Growth Rate ◽  
Statistical Analysis ◽  
Quantitative Analysis ◽  
Power Law ◽  
Degree Sequence ◽  
Power Law Distribution ◽  
Comprehensive Comparison ◽  
Statistical Studies ◽  
Financial Transactions ◽  
Over Time

AbstractCryptocurrencies as a new way of transferring assets and securing financial transactions have gained popularity in recent years. Transactions in cryptocurrencies are publicly available, hence, statistical studies on different aspects of these currencies are possible. However, previous statistical analysis on cryptocurrencies transactions have been very limited and mostly devoted to Bitcoin, with no comprehensive comparison between these currencies. In this study, we intend to compare the transaction graph of Bitcoin, Ethereum, Litecoin, Dash, and Z-Cash, with respect to the dynamics of their transaction graphs over time, and discuss their properties. In particular, we observed that the growth rate of the nodes and edges of the transaction graphs, and the density of these graphs, are closely related to the price of these currencies. We also found that the transaction graph of these currencies is non-assortative, i.e. addresses do not tend for transact with a particular type of addresses of higher or lower degree, and the degree sequence of their transaction graph follows the power law distribution.

Preliminary results from U–Th dating of glacial–interglacial deposition cycles in a silica speleothem from Venezuela

2010 ◽  
Vol 74 (1) ◽  
pp. 113-120 ◽  
Author(s):  
J. Lundberg ◽  
C. Brewer-Carias ◽  
D.A. McFarlane
Keyword(s):  
Heavy Metal ◽  
Growth Rate ◽  
Trace Element ◽  
Internal Structure ◽  
Metal Content ◽  
Heavy Metal Content ◽  
Preliminary Results ◽  
Spherical Mass ◽  
Diversity Study ◽  
Over Time

AbstractRecent explorations in Cueva Charles Brewer, a large cave in a sandstone tepui, SE Venezuela, have revealed silica biospeleothems of unprecedented size and diversity. Study of one — a sub-spherical mass of opaline silica — reveals a complex, laminated internal structure consisting of three narrow dark bands alternating with two wider light bands. Uranium–thorium dating has produced 3 stratigraphically correct dates on the light bands from 298 ± 6 (MIS 9) to 390 ± 33 ka (MIS 11). U concentration is only 30–110 ppb. Initial 234U/238U ratios are high and increase over time from 1.8 to 5.3. Growth rate is very low, the fastest, at 0.37 ± 0.23 mm/ka, in MIS 9. Trace element and heavy metal content of the dark bands is distinctly higher than that of the light bands. It is hypothesized that the dark and light bands correlate with drier/glacial and wetter/interglacial periods, respectively, and that this sample probably began to grow in MIS 13. The cave is in a region that straddles a regionally important ecotone: the speleothem isotopic and trace element variations may preserve a useful paleoclimatic signal. This is the first published suite of U–Th dates from a single silica speleothem and the longest Quaternary record for this region.

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