An Inexpensive and Collapsible Plant Growth Frame

This plant growth frame was designed for use in second and fourth grade classrooms as a part of National Science Foundation Grant TEI 8751303, Materials and Assistance for Science Teaching (MAST). We needed frames that were relatively inexpensive, could be made from locally available materials and would be easy to store when not in use. The frame is made from PVC pipe. The light source is a 48-inch, two-bulb shop light, using ordinary fluorescent tubes. A plug-in timer is used to control the time of illumination. Our first models included a plywood base, but some teachers have omitted this. The materials cost of each frame, including timer, shop light and bulbs, is about $35

Relationship between the COVID-19 pandemic and structural inequalities within the pediatric trauma population

BACKGROUND: The COVID-19 pandemic disrupted social, political, and economic life across the world, shining a light on the vulnerability of many communities. The objective of this study was to assess injury patterns before and after implementation of stay-at-home orders (SHOs) between White children and children of color and across varying levels of vulnerability based upon children\u27s home residence. METHODS: A multi-institutional retrospective study was conducted evaluating patients \u3c 18 years with traumatic injuries. A Control cohort from an averaged March-September 2016-2019 time period was compared to patients injured after SHO initiation-September 2020 ( COVID cohort). Interactions between race/ethnicity or social vulnerability index (SVI), a marker of neighborhood vulnerability and socioeconomic status, and the COVID-19 timeframe with regard to the outcomes of interest were assessed using likelihood ratio Chi-square tests. Differences in injury intent, type, and mechanism were then stratified and explored by race/ethnicity and SVI separately. RESULTS: A total of 47,385 patients met study inclusion. Significant interactions existed between race/ethnicity and the COVID-19 SHO period for intent (p \u3c 0.001) and mechanism of injury (p \u3c 0.001). There was also significant interaction between SVI and the COVID-19 SHO period for mechanism of injury (p = 0.01). Children of color experienced a significant increase in intentional (COVID 16.4% vs. Control 13.7%, p = 0.03) and firearm (COVID 9.0% vs. Control 5.2%, p \u3c 0.001) injuries, but no change was seen among White children. Children from the most vulnerable neighborhoods suffered an increase in firearm injuries (COVID 11.1% vs. Control 6.1%, p = 0.001) with children from the least vulnerable neighborhoods having no change. All-terrain vehicle (ATV) and bicycle crashes increased for children of color (COVID 2.0% vs. Control 1.1%, p = 0.04 for ATV; COVID 6.7% vs. Control 4.8%, p = 0.02 for bicycle) and White children (COVID 9.6% vs. Control 6.2%, p \u3c 0.001 for ATV; COVID 8.8% vs. Control 5.8%, p \u3c 0.001 for bicycle). CONCLUSIONS: In contrast to White children and children from neighborhoods of lower vulnerability, children of color and children living in higher vulnerability neighborhoods experienced an increase in intentional and firearm-related injuries during the COVID-19 pandemic. Understanding inequities in trauma burden during times of stress is critical to directing resources and targeting intervention strategies

Geochemical Assessment of Potential Sources for Nitrate in the Wasia Aquifer, Al Kharj Area, Central Saudi Arabia

Nitrate (NO3−) represents one of the major groundwater constituents with increasing distribution and concentration in the Kingdom of Saudi Arabia. This study aimed to determine potential sources of nitrate in the Early to Late Cretaceous Wasia aquifer system at the Al Kharj area (Central Saudi Arabia) by an integrative approach using groundwater geochemistry, nitrate isotopes (15N–NO3 and 18O–NO3), and tritium (3H) measurements. The lowest saline groundwater samples (TDS = 1400–2000 mg/L) from the peripheral zone were representative for pristine groundwater from the Wasia aquifer with nitrate concentrations below 20 mg/L and low 18O–NO3 ratios (8.7–20.6‰) but enriched 15N–NO3 values (up to 10.8‰). In contrast, 11 out of 34 analyzed water samples from irrigation wells and cattle watering wells exceeded the World Health Organization (WHO) drinking water guideline value for nitrate of 50 mg/L with maximum concentrations of up to 395 mg/L. Nitrate fertilizers and atmospheric deposition are the main sources of nitrate in groundwater in the eastern and northern sections of the study area. The combination of elevated salinities (4940–7330 mg/L), NO3 (111–395 mg/L), boron (516–1430 μg/L), and enriched 18O–NO3 (21.7–25.8‰) ratios with depleted 15N–NO3 (5.7–7.6‰) confirm the local influx of evaporated irrigation water with remnants of dissolved fertilizer into the Wasia groundwater system. There was no evidence for the influx of animal or human wastes from adjacent dairy, poultry, and housing infrastructures. Tritium concentrations below the detection limit of 0.8 TU for most borehole samples implied the absence of recent natural recharge. The estimated annual average N influx of 3.34 to 6.67 kg/ha to the Wasia aquifer requires a combination of atmospheric deposition and anthropogenic sources (mainly nitrate fertilizers) to increase the nitrogen content of the Wasia aquifer

Surface topography of hydroxyapatite affects ROS17/2.8 cells response

Hydroxyapatite (HA) has been used in orthopedic, dental, and maxillofacial surgery as a bone substitute. The aim of this investigation was to study the effect of surface topography produced by the presence of microporosity on cell response, evaluating: cell attachment, cell morphology, cell proliferation, total protein content, and alkaline phosphatase (ALP) activity. HA discs with different percentages of microporosity (< 5%, 15%, and 30%) were confected by means of the combination of uniaxial powder pressing and different sintering conditions. ROS17/2.8 cells were cultured on HA discs. For the evaluation of attachment, cells were cultured for two hours. Cell morphology was evaluated after seven days. After seven and fourteen days, cell proliferation, total protein content, and ALP activity were measured. Data were compared by means of ANOVA and Duncan’s multiple range test, when appropriate. Cell attachment (p = 0.11) and total protein content (p = 0.31) were not affected by surface topography. Proliferation after 7 and 14 days (p = 0.0007 and p = 0.003, respectively), and ALP activity (p = 0.0007) were both significantly decreased by the most irregular surface (HA30). These results suggest that initial cell events were not affected by surface topography, while surfaces with more regular topography, as those present in HA with 15% or less of microporosity, favored intermediary and final events such as cell proliferation and ALP activity

Cloud Modeling of a Network Region in H-alpha

In this paper, we analyze the physical properties of dark mottles in the chromospheric network using two dimensional spectroscopic observations in H-alpha obtained with the Gottingen Fabry-Perot Spectrometer in the Vacuum Tower Telescope at the Observatory del Teide, Tenerife. Cloud modeling was applied to measure the mottles' optical thickness, source function, Doppler width, and line of sight velocity. Using these measurements, the number density of hydrogen atoms in levels 1 and 2, total particle density, electron density, temperature, gas pressure, and mass density parameters were determined with the method of Tsiropoula & Schmieder (1997). We also analyzed the temporal behaviour of a mottle using cloud parameters. Our result shows that it is dominated by 3 minute signals in source function, and 5 minutes or more in velocity.Comment: 6 pages, 5 figures, accepted for publication in Astronomische Nachrichten - Astronomical Note

What Is Published About Special Education In Arab Countries? A Preliminary Analysis

The use of research-based educational practices when serving students with disabilities is an essential component of special education policy as, if such a research foundation is missing, policies are compromised. Because of government funding that has supported individual and programmatic research efforts for decades, much of the special education research base used throughout the world comes from the United States. Does such research, though, automatically transfer to the context of special education services in Qatar and other Arab countries? Standard assumptions about educational research suggest that the answer might be, not necessarily. What literature from Arab countries, then, is available to guide policy makers, researchers, administrators, and educators in the Middle East and North Africa? This QNRF-funded Undergraduate Research Experience Project: (a) identified the published literature on special education in the Arab world, (b) indexed it, and (c) conducted preliminary analyses of important characteristics of the journal articles to provide a broad yet detailed preliminary characterization of the body of work that exists about special education in Arab countries. Using five library catalogs, three electronic databases in Arabic-EduSearch, Shamaa, and Al Manhal-and two in English-EBSCO's Academic Search Complete and PsycArticles-the project identified 1,916 unduplicated items about special education for Arab students: 1,247 journal articles, 408 books, 186 theses, 58 reports, 8 book chapters, 2 artworks, 1 conference proceeding, 1 newspaper article, and 5 other items. Results from the analyses of the journal articles indicate that: (a) there is indeed a literature, (b) it is research-based, (c) to a large extent it deals with educationally related topics, and (d) it is quickly increasing over time. The amount of literature, though, is relatively small when one takes into consideration the size of the Arab world. A 2009 study of 11 special education journals in the United States found 6,724 articles over a 19-year period, whereas this project only uncovered 1,274 over a longer period of time from a less restricted number of journals. In addition, it appears that there may be large gaps in the Arab scholarly literature on special education in regards to specific countries and regions of the Arab world, disabilities, and age groups. The project also raises important questions about the implications of what literature is available and to whom, questions that speak directly to the challenges of being aware of and understanding the issues about special education in the Arab world as Qatar and other Arab states make the transition to knowledge-based societies. For instance, how does the Arab special education literature that is available in Arabic differ from that published in English, and what does that mean for educational leaders who can only access material in one of the languages? As it is much more difficult to export the results of searches from the Arabic databases than it is from those in English, what might be the effects on conducting systematic reviews from those sources? And what steps can be taken to remedy such differences in Arab special education knowledge accessibility?qscienc

Multichannel image identification and restoration using continuousspatial domain modeling

In this paper, a novel identification technique for multichannel image processing is presented. Using the maximum likelihood estimation (ML) approach, the image is represented as an autoregressive (AR) model and blur is described as a continuous spatial domain model. Such a formulation overcomes some major limitations encountered in other ML methods. Moreover, cross-spectral and spatial components are incorporated in the multichannel modeling. It is shown that by incorporating those components, the overall performance is improved significantly. Also, experimental results show that blur extent can be optimally identified from noisy color images that are degraded by uniform linear motion or out-of-focus blur

Beyond the walls of the school: Risk factors and children and youth in the Gulf

UNESCO has reported that progress on the Education For All movement has been slow in the Arab world, including the countries of the Gulf Cooperation Council. The low levels of achievement on national and international assessment tests in these states support this judgment. In this conceptual paper, we explore risk factors that can impact the education and educational outcomes of children and youth, reviewing the existing literature and considering its applicability to the Gulf. We argue that risk factors exist in the Gulf that affect short- and long-term outcomes and create barriers to success. Three such factors identified include societal change, familial factors, and gender.qscienc

Severe Neuro-COVID is associated with peripheral immune signatures, autoimmunity and signs of neurodegeneration: a prospective cross-sectional study

Importance Growing evidence suggests that coronavirus disease 2019 (COVID-19) is associated with neurological sequelae. However, the underlying pathophysiological mechanisms resulting in central nervous system (CNS) derogation remain unclear. Objective To identify severity-dependent immune mechanisms in the cerebrospinal fluid (CSF) and plasma of COVID-19 patients and their association with brain imaging alterations. Design Prospective cross-sectional cohort study. Setting This study was performed from August 2020 to April 2021. Participants were enrolled in the outpatient clinics, hospital wards and intensive care units (ICU) of two clinical sites in Basel and Zurich, Switzerland. Participants Age >18 years and a positive SARS-CoV-2 test result were inclusion criteria. Potentially matching individuals were identified (n=310), of which 269 declined to participate and 1 did not match inclusion criteria. Paired CSF and plasma samples, as well as brain images, were acquired. The COVID-19 cohort (n=40; mean [SD] age, 54 [20] years; 17 women (42%)) was prospectively assorted by neurological symptom severity (classes I, II and III). Age/sex-matched inflammatory (n=25) and healthy (n=25) CSF and plasma control samples were obtained. For volumetric brain analysis, a healthy age/sex-matched control cohort (n=36) was established

A Techniques for Scalable and Effective Routability Evaluation

Routing congestion has become a critical layout challenge in nanoscale circuits since it is a critical factor in determining the routability of a design. An unroutable design is not useful even though it closes on all other design metrics. Fast design closure can only be achieved by accurately evaluating whether a design is routable or not early in the design cycle. Lately, it has become common to use a “light mode ” version of a global router to quickly evaluate the routability of a given placement. This approach suffers from three weaknesses: (i) it does not adequately model local routing resources, which can cause incorrect routability predictions that are only detected late, during detailed routing, (ii) the congestion maps obtained by it tend to have isolated hot spots surrounded by noncongested spots, called “noisy hot spots”, which further affects the accuracy in routability evaluation, (iii) the metrics used to represent congestion may yield numbers that do not provide sufficient intuition to the designer; moreover, they may often fail to predict the routability accurately. This paper presents solutions to these issues. First, we propose three approaches to model local routing resources. Second, we propose a smoothing technique to reduce the number of noisy hot spots and obtain a more accurate routability evaluation result. Finally, we develop a new metric which represents congestion maps with higher fidelity. We apply the proposed techniques to several industrial circuits and demonstrate that one can better predict and evaluate design routability, and congestion mitigation tools can perform muc