This study draws upon survey and administrative data on over 9,000 teachers in 336 Miami-Dade County public schools over 2 years to investigate the kinds of collaborations that exist in instructional ...teams across the district and whether these collaborations predict student achievement. While different kinds of teachers and schools report different collaboration quality, we find average collaboration quality is related to student achievement. Teachers and schools that engage in better quality collaboration have better achievement gains in math and reading. Moreover, teachers improve at greater rates when they work in schools with better collaboration quality. These results support policy efforts to improve student achievement by promoting teacher collaboration about instruction in teams.
The concept of grit as described by Duckworth (Journal of personality and social psychology 92:1087, 2007) has captured the attention of educators and researchers alike. A measure of a student's ...ability to effortfully persist in the face of struggle, grit is proposed to be an important characteristic required for students to succeed academically (Duckworth in Journal of personality and social psychology 92:1087, 2007). Some evidence suggests that grit has a positive relationship with a range of academic outcomes, and yet others argue that grit offers little in terms of predictive value for understanding academic outcomes. In addition, there is conflicting evidence about the presence of gender differences in grit, and very little research around the role of being the first member of the family to attend university in the development of grit. In order to address conflicting findings about the importance and correlates of grit, and to explore the role of engagement in the relationship between grit and academic outcomes, a cross sectional survey study was conducted. The current research measured grit, engagement and academic productivity among 395 Australian university students. Findings suggest that there is no difference in grit between genders, although this cannot be concluded with certainty due to a large imbalance of male to female participants. It also appeared that being the first in family to attend university was associated with an increased level of the grit factor 'effort'. There was a positive relationship between grit, engagement and academic productivity. Further analysis revealed that engagement mediated the relationship between grit and productivity, suggesting that a person with higher grit is more likely to have higher engagement, and that engagement leads to greater academic productivity. These findings highlight the relevance of grit as a desirable student characteristic, and the importance of engagement in the grit-productivity relationship.
Coal seam water injection has an obvious effect on coal dust prevention. The high-pressure water environment of coal seam water injection changes the structure of coal which brings new effects on the ...characteristics of coal spontaneous combustion disaster. To reveal the effects of water immersion pressure on the oxidation characteristics of long-flame coal, coal samples immersed in water at 0.1 MPa, 2.5 MPa, 5.0 MPa, 7.5 MPa and 10.0 MPa were prepared. Four experiments were conducted to study the changes in oxidation characteristics and its main reasons. The results showed that elevated water immersion pressure promoted the spontaneous combustion tendency of coal, and the composite judgment index of coal decreased to 521.1. Coal immersed in pressurized water entered the stages of oxygen-absorbing oxidation and thermal decomposition earlier than coal immersed in atmospheric pressure water. The specific surface area and average pore diameter of coal immersed in high-pressure water increased, where the pore volume proportion of mesopores of the coal immersed in water at 10.0 MPa increased by 138.5 % compared with that of the coal immersed in atmospheric pressure water. The elevated water immersion pressure prompted coal to produce further aliphatic hydrocarbons and hydroxyl groups, which improved the low-temperature oxidation capacity.
•Pressurized water-immersed coal samples were prepared using homemade pressurized water immersion equipment.•Oxidation characteristics and spontaneous combustion characteristics of long-flame coal in pressurized water were compared.•The changes in pore structure and chemical functional groups of pressurized water-immersed coal samples were analyzed.
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•High-moisture corn stalk and stylo was ensiled with Bauhinia variegata flower (BVF)•BVF reduced butyrate content and proteolysis in corn stalk and stylo silage.•BVF increased the ...bacterial diversity of corn stalk and stylo silage.•BVF reduced Clostridium, Enterobacter and increased lactic acid bacteria abundance.•Mixing BVF helped to improve silage fermentation quality and protein preservation.
Bauhinia variegate flower (BVF) was supposed to improve silage fermentation due to its abundant active components. Thus, corn stalk and stylo were ensiled with addition of 0, 5% or 10% BVF, and then ensiling characteristics, protein fraction and bacterial community were analyzed after 60-day fermentation. The contents of butyric acid (2.9 vs not detected, 13.2 vs 3.0 g/kg DM in corn stalk and stylo silage, respectively), ammonia-N (100.2 vs 83.2, 110.8 vs 61.9 g/kg total N) and free amino acid (35.6 vs 16.5, 35.0 vs 16.4 g/kg total N) were decreased in 10% BVF treated silages. The bacterial diversity was increased, where the relative abundance of Enterobacter or Clostridium decreased and that of lactic acid producing bacteria such as Lactobacillus, Weissella or Enterococcus increased. It is suggested that BVF could be used to improve fermentation quality and nutrient preservation of high-moisture corn stalk and stylo silage.
•Multiphase flow images during the injection of water, CO2 and WAG were presented.•Oil trapping process and EOR mechanism were analyzed based on dynamic visual images.•A series of complex phenomena ...during CO2 and WAG injections were found and explained.•Efficiencies of volumetric sweep and oil displacement were obtained based on images.•CO2-EOR, WAG-EOR and WAG-CCS were investigated based on ImageJ gray analysis method.
Water-alternating-gas (WAG) injection has been widely applied in fossil fuel reservoirs to enhance oil recovery (EOR) and CO2 capture and storage (CCS) efficiency. However, no systematic investigation on the multiphase flow characteristics and EOR mechanism of WAG injection after continuous CO2 injection has been conducted at the micro-scale. Therefore, a visual micromodel was developed using CT scanning and microelectronic photolithography. Subsequently, micro-scale visual experiments were conducted to simulate the water injection, CO2 injection and WAG injection processes. Then, the multiphase flow characteristics and residual oil trapping mechanism were observed and analyzed. Finally, the volumetric sweep efficiency (VSE), oil displacement efficiency (ODE), residual oil distribution, and improvement effects of WAG-EOR and WAG-CCS were quantitatively studied. Experimental results revealed the flow characteristics of oil–water, oil–gas, and oil–gas–water were different. Pore throat morphology, wettability, and injection parameters all affects the multiphase flow process. Six types of residual oil were trapped and observed at various locations. The multiphase flow characteristics of jumping displacement, multiple displacement, and compression-release were identified. The VSE of water injection, gas injection, and WAG injection were 68.0%, 53.5%, and 86.0%, respectively. WAG injection significantly reduced “cluster-shaped” and “island-shaped” residual oil and oil film/ring. Therefore, the WAG-EOR mechanism is a combination of the macroscopic VSE of water injection and the microscopic ODE of CO2 injection. WAG injection after continuous CO2 injection increased oil recovery by 23.15% and CCS by 0.174 PV. However, the improvement effects of EOR and CCS capacity were dominated by the first and second WAG injection cycles, respectively.
가로수는 도시환경개선과 환경회복기능, 그리고 차단된 도시녹지의 연결통로로 소생태계 서식처 제공의 역할 등 녹색 네트워크의 핵심 및 자연성 회복의 수단으로 중요성이 더욱 강조되고 있다. 그러나 가로수는 일반적으로 도시환경에 적응이 우수한 몇 가지 수종을 선별하여 대단위 식재를 해오고 있어 전 세계적으로 편중화에 대한 문제가 지적되었다. 본 연구는 가로수 ...선정을 위한 평가기준과 세부지표를 마련하고, 계층적 분석기법(AHP:analytic hierarchy process)을 통해 그 중요도를 도출하였다. 가로유형별 중요도를 보면 상업가로는 경관향상성이 0.2640, 세부지표는 수형이 0.1245로 가장 높았다. 업무가로도 경관향상성이 0.2496, 세부지표는 수형이 0.1177로 가장 높아 상업가로와 유사한 결과를 보였다. 주거가로는 시민편의성이 0.2250, 세부지표는 수형이 0.0936으로 가장 높았다. 일반생활가로는 유지관리성이 0.2479, 수형이 0.1062이었다. 역사경관가로는 지역특성이 0.3488, 세부지표는 상징성이 0.1586, 기념성이 0.1095로 높았다. 생태네트워크가로는 생태계균형성이 0.4266, 세부지표는 종다양성이 0.1643, 자생종이 0.1556으로 높았다. 자동차중심가로는 대기오염저감성이 0.4639, 세부지표는 배기가스 저감이 0.1928, 미세먼지 저감이 0.1765, 이산화탄소 저감이 0.0945로 높게 나타났다. 가로유형별 세부지표 중 수형의 중요도가 공통적으로 높았는데, 이는 가로의 위치 특성 상 가로 경관에 대한 중요성에 대해 높이 인식하고 있는 것으로 판단된다. 본 연구는 가로수 수종 선정 시 가로유형별 특성을 고려하여 평가기준과 세부지표를 설정하고 중요도의 정량적 기준 제시를 통하여 객관적 수종 선정 기준을 도출하였다.
Street trees improve the cityscape and air quality, reduce heat islands, and create wildlife habitats. Hence, they are essential parts of a city’s green infrastructure. Therefore, several trees that are well adapted to the urban environment were planted. However, this caused the problem of simple trees being planted around the world. This study is to select more various street trees. To accomplish this, evaluation criteria and detailed indexes were created. The importance was indicated through the Analytic Hierarchy Process. For commercial roads, the priority of landscape characteristics is 0.2640, and among detailed indicators, the priority of shape is 0.1245. For work roads, the priority of landscape characteristics is 0.2496, and among detailed indicators, the priority of shape is 0.1177. For work roads, the priority of characteristics of civil service is 0.2250, and among detailed indicators, the priority of shape is 0.1177. For general roads, the priority of maintenance characteristics is 0.2479, and among detailed indicators, the priority of shape is 0.1062. For historical and cultural roads, the priority of regional characteristics is 0.3488, and among detailed indicators, the priority of regional characteristics is 0.1643. For ecological roads, the priority of ecosystem characteristics is 0.3488, and among detailed indicators, the priority of the diversity of species is 0.1643. For automotive-only roads, the priority of the ecosystem characteristics is 0.4639, and among detailed indicators, the priority of reducing emissions is 0.1643. This study will provide objective criteria for the selection of street trees.
•Using InSAR to obtain the coseismic deformation field of the Maduo Ms7.4 earthquake.•Inversion of Maduo Ms7.4 earthquake seismic fault model based on InSAR deformation field.•Analyze the fault ...segmented characteristics of the Maduo Ms7.4 earthquake, the double fault model is more reasonable.•Using GNSS data to analyze the deformation characteristics before the Maduo Ms7.4 earthquake.
Over the past 70 years, the Qinghai Maduo Ms7.4 earthquake (May 22, 2021) has been the only earthquake with a magnitude of ≥7 that has occurred within the Bayan Har Block. To investigate the deformation process of this earthquake, we acquired the Interferometric Synthetic Aperture Radar (InSAR) coseismic deformation field based on Sentinel-1 SAR images, which showed that the maximum line of sight (LOS) displacement was ~1 m. By combining this information with the results of our field investigation, the fault slip distributions were obtained by inversion using the single- and double-fault models, wherein the latter model showed better inversion results than that of the former. According to the inversion results, the overall rupture pattern was predominantly left-lateral strike-slip, with a released seismic moment of ~Mw7.5. Specifically, the principal seismogenic fault had a strike of 283°, dip of 91°, and maximum slip of 4.87 m; the branch fault along the eastern segment of the rupture had a strike of 110°, dip of 94°, and maximum slip of 2 m. Conversely, the results derived from the Global Navigation Satellite System (GNSS) strain rate field before the earthquake indicated that the Maduo earthquake occurred in East Kunlun,which is characterized by the largest maximum shear strain rate. The strain accumulation rate (~2.5 × 10−8/yr) was significantly lower than that of the Xianshuihe fault zone on the southern boundary of the Bayan Har block and the East Kunlun fault zone on its northern boundary. Furthermore, pre-seismic deformation near the seismogenic fault was relatively gentle, showing partial late seismogenic characteristics.
In the context of a national conversation about exclusionary discipline, we conducted a multilevel examination of the relative contributions of infraction, student, and school characteristics to ...rates of and racial disparities in out-of-school suspension and expulsion. Type of infraction; race, gender, and to a certain extent socioeconomic status at the individual level; and, at the school level, mean school achievement, percentage Black enrollment, and principal perspectives all contributed to the probability of out-of-school suspension or expulsion. For racial disparities, however, school-level variables, including principal perspectives on discipline, appear to be among the strongest predictors. Such a pattern suggests that schools and districts looking to reduce racial and ethnic disparities in discipline would do well to focus on school- and classroom-based interventions.
Major differences between men and women exist in epidemiology, manifestation, pathophysiology, treatment, and outcome of cardiovascular diseases (CVD), such as coronary artery disease, pressure ...overload, hypertension, cardiomyopathy, and heart failure. Corresponding sex differences have been studied in a number of animal models, and mechanistic investigations have been undertaken to analyze the observed sex differences. We summarize the biological mechanisms of sex differences in CVD focusing on three main areas, i.e., genetic mechanisms, epigenetic mechanisms, as well as sex hormones and their receptors. We discuss relevant subtypes of sex hormone receptors, as well as genomic and nongenomic, activational and organizational effects of sex hormones. We describe the interaction of sex hormones with intracellular signaling relevant for cardiovascular cells and the cardiovascular system. Sex, sex hormones, and their receptors may affect a number of cellular processes by their synergistic action on multiple targets. We discuss in detail sex differences in organelle function and in biological processes. We conclude that there is a need for a more detailed understanding of sex differences and their underlying mechanisms, which holds the potential to design new drugs that target sex-specific cardiovascular mechanisms and affect phenotypes. The comparison of both sexes may lead to the identification of protective or maladaptive mechanisms in one sex that could serve as a novel therapeutic target in one sex or in both.
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