888 research outputs found
Summary report of the EEPSEA-China in Country Training Course for Environmental and Natural Resource Economics, Beijing, China, October 20 - 30, 2008
No full textFuture trends in nanotechnology aiming environmental applications
No full textDepartment of Environmental Engineering São Paulo State University (UNESP), Avenida Três de Março, no 511Department of Biotechnology University of Sorocaba, Rodovia Raposo Tavares, Km 92.5Department of Animal and Plant Biology UEL-State University of Londrina, Rodovia Celso Garcia Cid, Km 380Pampa Federal University- UNIPAMPA, BR 472, Km 592, POBox 118State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Beijing Normal UniversityDepartment of Environmental Engineering São Paulo State University (UNESP), Avenida Três de Março, no 51
Chemical characterization of size-resolved aerosols in four seasons and hazy days in the megacity Beijing of China
No full textSize-resolved aerosol samples were collected by MOUDI in four seasons in 2007 in Beijing. The PM10 and PM1.8mass concentrations were 166.0 ± 120.5 and 91.6 ± 69.7 μg/m~3, respectively,throughout the measurement, with seasonal variation: nearly two times higher in autumn than in summer and spring. Se...National Natural Science Foundation of China [41175018, 41475113]; State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry [LAPC-KF-2014-01]SCI(E)EIPubMed中国科技核心期刊(ISTIC)中国科学引文数据库(CSCD)[email protected]; [email protected]
Role of secondary aerosols in haze formation in summer in the Megacity Beijing
No full textA field experiment from 18 August to 8 September 2006 in Beijing, China, was carried out. A hazy day was defined as visibility42-, NO3-, NH4+ and SOA were 49.8 (??31.6), 31.4 (??22.3), 25.8 (??16.6) and 8.9 (??4.1)??g/m3, respectively, during the haze episodes, which were 4.3, 3.4, 4.1, and 1.7 times those in the non-haze days. The SO42-, NO3-, NH4+, and SOA accounted for 15.8%, 8.8%, 7.3%, and 6.0% of the total mass concentration of PM10 during the non-haze days. The respective contributions of SNA species to PM10 rose to about 27.2%, 15.9%, and 13.9% during the haze days, while the contributions of SOA maintained the same level with a slight decrease to about 4.9%. The observed mass concentrations of SNA and SOA increased with the increase of PM10 mass concentration, however, the rate of increase of SNA was much faster than that of the SOA. The SOR (sulfur oxidation ratio) and NOR (nitrogen oxidation ratio) increased from non-haze days to hazy days, and increased with the increase of RH. High concentrations of aerosols and water vapor favored the conversion of SO2 to SO42- and NO2 to NO3-, which accelerated the accumulation of the aerosols and resulted in the formation of haze in Beijing. ? 2015.SCI(E)EI051-603
Digital Humanities Scholarly Commons at Beijing Normal University Library
No full textDigital humanities is a new field in the data age that introduces computing technology into humanities literature. Many libraries have built digital humanities scholarly commons, but it is rare in China’s libraries. Through literature and website research, digital humanities database construction practice, questionnaires, and interviews with humanities scholars, we explore the path to build digital humanities scholarly commons at Beijing Normal University Library. We constructed an educators’ prosopography database, collected database construction suggestions from humanities scholars, and assessed their willingness to construct a digital humanities commons with us. Combined with the feedback, we found that humanities researchers are interested in digital humanities methods, but they need relevant tools training. Beijing Normal University Library can provide humanities scholars with training workshops on digital humanities concepts, methods, tools, platforms, and database construction, and the library is good at full-cycle data service including data collection, management, storage, and publishing. The library should strengthen data mining, text analysis, and visualization in the digital humanities study, focus on the authority and reliability of data, cooperate with humanities scholars to collect and verify data, and then enhance the library’s influence in the academic communityEmbargoed Restriction set for Item 116981 on 2021-02-12T19:03:17Z with date 2023-09-30 by [email protected] by Madina Grace ([email protected]) on 2021-02-12T19:24:24Z
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Geometrical reasoning in the primary school, the case of parallel lines
No full textDuring the primary school years, children are typically expected to develop ways of explaining their mathematical reasoning. This paper reports on ideas developed during an analysis of data from a project which involved young children (aged 5-7 years old) in a whole-class situation using dynamic geometry software (specifically Sketchpad). The focus is a classroom episode in which the children try to decide whether two lines that they know continue (but cannot see all of the continuation) will intersect, or not. The analysis illustrates how the children can move from an empirical, visual description of spatial relations to a more theoretical, abstract one. The arguments used by the children during the lesson transcend empirical arguments, providing evidence of how young children can be capable of engaging in aspects of deductive argumentation
Education and Training in the British Virgin Islands: A Partially Annotated Bibliography
No full textThis bibliography on “Education and Training in the British Virgin Islands” has been specifically prepared for the UWI School of Continuing Studies’ British Virgin Islands Conference. An attempt has been made to be as comprehensive as possible, but the compiler recognizes that because of the weak bibliographical coverage of the literature of the region, important items may have been omitted. This is especially true for policy documents emanating from official sources, since many of these do not reach library and documentation centres. This publication contributes to the development of content for a computerized database being developed by the Caribbean Educational Research Information Service (CERIS) at the School of Education, UWI, St. Augustine. A few websites available on the Internet have been included in the bibliography
[[alternative]]Action research to implement environmental education in Junior High School out-of-school teaching
No full text[[abstract]]With a view to promoting out-of-school teaching in junior high school , four postgraduates of graduate institute of environmental education at National Taiwan Normal University, together with four teachers of Taipei City Nei-hu Junior High School, were in the great hope of discovering appropriate activities for out-of-school teaching by means of action research.
The span of the out-of-school activities design lasted for four months. Eight researchers were divided into four groups , each of which consisted of one postgraduate and one junior high school teacher. Then, the participating researchers carried out out-of-school teaching for a day, including ten natural awareness activities held at National Yangmingshan Park. One class, thirty two first-grade students included, of Taipei City Nei-hu Junior High School took part in this out-of-school teaching.
This research aims at exploring three issues. First , what is the professional development of the participating researchers ? Second , what are the obstacles and good effects of these researchers* cooperating with each other ? Third, as to the participating students, what are the good effects of these natural awareness activities?
According to the result of analyzing the research data, the participating teachers have cultivated several professional developments. For examples, the participating teachers liked to undertake natural awareness activities. In addition, the participating teachers also changed their opinions of the students* learning attitudes, and so on. These participating postgraduates also achieved the experiences of their professional developments; for examples, they have fathomed more concerning the substances of both environment education and action research. They have realized some skills in demonstrating the natural awareness activities as well.
While these researchers were cooperating with each others, there were also some obstacles. The participating researchers were too busy with their schoolwork. to spend more time carrying out their roles of designing activities . When the researchers were cooperating with each others, there were also some good effects. The participating teachers enriched the content of the activities immensely. They could also help check whether the activities were suitable for the participating students.
As far as those participating students are concerned, there were several good effects of the natural awareness activities. They enjoyed appreciating beautiful scenery to their heart*s content. They also came by some first-hand experiences about the natural environment. They partook of these out-of-school activities with much relish.
Role of short-term dynamics of synpses between dentate gyrus interneurons in shaping excitability in normal and epileptic circuits
No full textTemporal lobe epilepsy (TLE) is a relatively common form of epilepsy that is difficult to manage and is characterized by recurrent unprovoked seizures originating in the temporal lobe of the brain. Seizures in TLE often start in the hippocampus, and are associated with structural and functional changes in the dentate gyrus (DG), a region within the hippocampus. Seizure activity can lead to physiologic changes that can underlie or worsen the severity of epilepsy. In order to elucidate the mechanisms underlying TLE, it is important to develop a detailed understanding of the specific physiological changes and their effects on network activity patterns.
The main projection neuron in the DG is the granule cell (GC), an excitatory neuron. However, most of the other cell types in the DG are inhibitory interneurons. Two of these inhibitory interneurons are parvalbumin-expressing, fast-spiking basket cells (fsBCs), and accommodating cells (ACs). Recent research has shown that the synapses between ACs and fsBCs show a functional reduction in reliability of synaptic transmission after experimental seizure induction. Previous studies identified that this change affects oscillatory coupling in simulated networks including fsBCS and ACs. Similar network oscillation disruptions in the DG have been linked to complications of epilepsy. In addition to baseline characteristics of synaptic release, synapses show activity-dependent changes in synaptic properties. Of particular relevance, synapses from fsBCs undergo short-term depression and synapses from ACs undergo short-term facilitation. However, the impact of such short-term synaptic dynamics on large-scale circuit activity patterns is not commonly modeled.
This study used computational modeling to examine how the short term dynamics of synapses between ACs and fsBCs modify network excitability and oscillations in networks with normal and epileptic synaptic characteristics. A model of the facilitation-depression synapse was successfully implemented in the NEURON programming environment and applied to a network of DG excitatory and inhibitory neurons. Cell-type specific short term synaptic dynamics were constrained based on published experimental data in specific cell types. Excitability was compared between models of a control network of DG neurons and a post-seizure network of DG neurons. The post-seizure network was modeled to mimic the functional reduction in reliability between ACs and fsBCs seen in experimental seizure induction by decreasing the probability of synaptic release in response to firing. Implementation of the seizure-induced decrease in AC to fsBC synaptic release probability failed to alter average granule cell firing frequency and duration in response to synchronous afferent activation. Excitability was also compared between networks incorporating synapse specific short term synaptic dynamics and networks that did not. Inclusion of short term synaptic dynamics led to modest increases in excitability which were not statistically significant. In contrast to the limited change in excitability, comparison of oscillatory behavior between control and post-seizure networks revealed an increase in coherence and a change in frequency power spectra. Addition of short term synaptic dynamics resulted in decreased coherence and a change in frequency power spectra. Overall, it was shown that a decrease in functional reliability in AC to fsBC synapses, when modeled with biologically realistic facilitation-depression synapses, has little effect on network excitability, but significant effects on network oscillatory behavior.M.S.Includes bibliographical references
The impact of ecological compensation for cultivated land protection on farmers' perception of sustainable livelihood risks in northeast black soil area
No full textTaking the survey data of Northeast Black Soil Area as a research sample, the ecological compensation policy for cultivated
land protection was introduced into the sustainable livelihood risk perception analysis framework of the United Kingdom Department for
International Development, and the direct impact and indirect eff ects of the ecological compensation policy for cultivated land protection
on farmers' sustainable livelihood risk perception in Northeast Black Soil Region were studied by using a structural equation model. The
results showed that the direct impact eff ect of ecological compensation for cultivated land protection on the risk perception of sustainable
livelihood in the northeast black soil area was 0.986, the direct effect of ecological compensation policy for cultivated land protection
in northeast black soil area through drinking water facility construction, sanitation environment and village appearance, electricity and
communication network was 1, 0.32 and 1, respectively, and the direct eff ects of farmers' repayment of loans and debts, income reduction
and environmental pollution risk concerns on the risk perception of sustainable livelihood were 1, 0.66 and 0.56. Therefore, the accurate
ecological compensation policy for cultivated land protection in the northeast black soil area can optimize the risk perception of sustainable
livelihoods and improve farmers' sense of gain
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