We present the results of a cross-correlation search for gravitational waves from SNR 1987A using the second year of LIGO science run 5 data. The frequency band 75–450 Hz is searched. No evidence of ...gravitational waves is found. A 90% confidence upper limit of h0≤3.8×10−25 is placed on the gravitational-wave strain at the most sensitive frequency near 150 Hz. This corresponds to an ellipticity of ε≤8.2×10−4 and improves on previously published strain upper limits by a factor of approximately 4. We perform a comprehensive suite of validations of the search algorithm and identify several computational savings that marginally sacrifice sensitivity in order to streamline the parameter space being searched. We estimate detection thresholds and sensitivities through Monte Carlo simulations.
This research aims to provide assistance and Virtual Simulation Instructional (VSI) training for drop out as a pilot for digital mathematical entrepreneurship in the industrial revolution 4.0 era so ...that graduates have ICT skills and are ready to face disruption. The subject of the research was the centre of learning activities of Insan Madani School and Dewi Sartika School in Baros, Serang, Banten, Indonesia. The research method used is a combination of informative methods and interactive demonstrations. The results showed that students' abilities in terms of ICT with an increasing model of understanding in optimal model of 75.56%, non-creative model of 7.78%, theoretical model of 4.44 practical model of 4.44%, memorizing model of 10 %, and no model of 0% and were able to produce VSI with quality that was suitable for sale. The VSI recommendations are a strategic alternative in the development of small digital scale industry businesses and their use for digital mathematics entrepreneurship pilot learning.
We present the results of a cross-correlation search for gravitational waves from SNR 1987A using the second year of LIGO Science Run 5 data. The frequency band 75--450\,Hz is searched. No evidence ...of gravitational waves is found. A 90\% confidence upper limit of \(h_0 \leq 3.8\times10^{-25}\) is placed on the gravitational wave strain at the most sensitive frequency near 150\,Hz. This corresponds to an ellipticity of \(\epsilon \leq 8.2\times10^{-4}\) and improves on previously published strain upper limits by a factor \(\approx4\). We perform a comprehensive suite of validations of the search algorithm and identify several computational savings which marginally sacrifice sensitivity in order to streamline the parameter space being searched. We estimate detection thresholds and sensitivities through Monte-Carlo simulations.
The predicted increase in frequency and intensity of boreal forest fires is considered a significant source of carbon dioxide emissions and linked with the degradation of permafrost covering more ...than half of Russia. Here we analyzed the stand structure and growth of East Siberian larch forests in response to fire severity. We measured 23 sites in the southern part of eastern Siberia along a latitudinal transect with a length of more than 1500 km. Live tree volume differed significantly across geographical regions (p < 0.05), decreasing from south to north (76-250 m.sup.3*ha.sup.-1), with higher values in forests burnt with low severity. Similarly, volume of coarse woody debris decreased from south to north. The volume of dead standing trees, on the other hand, increased from south to north. The distribution of trees by diameter class in some areas showed clear evidence of fires, with small trees being absent to rare in forests burnt at high severity. The impact of severe fires on stand volume was negligible at the southern sites, potentially associated with rapid regeneration of birch. Birch is an important component of larch forests near the southern boundary of the permafrost, which may contribute to larch forests in the southern part of the study transect being less vulnerable to wildfires compared to northern larch forests.
Celotno besedilo
Dostopno za:
BF, DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
Abstract
The scientific development process can be carried out with STEM (Science Technology Engineering Mathematics) education where this interdisciplinary approach trains students to learn where ...the concept of science is combined with the context in applying science, technology, engineering, and mathematics. The purpose of the study is the development of Interactive Book Augmented Reality (IBAR) for Lesson Physics on STEM. The research method is the ADDIE Model which consists of the stages of Analysis, Design, Development, Implementation, and Evaluation. The sample for the implementation of IBAR used in the study amounted to 90 students aged 19-22 years from a province in Indonesia. The results showed that IBAR contributed to students’ concepts in physics. In the questionnaire given to students, information was obtained that the IBAR application was more useful, realistic, and interesting for their learning; help them understand and analyze problems and STEM scenarios. It has been suggested that IBAR technology could be a potent and effective tool to enable Lesson Physics students in the STEM process. In addition, the implications of using IBAR for physics education and recommendations for further studies are also discussed in this study.
With less than 3200 wild tigers in 2010, the heads of 13 tiger-range countries committed to doubling the global population of wild tigers by 2022. This goal represents the highest level of ambition ...and commitment required to turn the tide for tigers in the wild. Yet, ensuring efficient and targeted implementation of conservation actions alongside systematic monitoring of progress towards this goal requires that we set site-specific recovery targets and timelines that are ecologically realistic. In this study, we assess the recovery potential of 18 sites identified under WWF's Tigers Alive Initiative. We delineated recovery systems comprising a source, recovery site, and support region, which need to be managed synergistically to meet these targets. By using the best available data on tiger and prey numbers, and adapting existing species recovery frameworks, we show that these sites, which currently support 165 (118-277) tigers, have the potential to harbour 585 (454-739) individuals. This would constitute a 15% increase in the global population and represent over a three-fold increase within these specific sites, on an average. However, it may not be realistic to achieve this target by 2022, since tiger recovery in 15 of these 18 sites is contingent on the initial recovery of prey populations, which is a slow process. We conclude that while sustained conservation efforts can yield significant recoveries, it is critical that we commit our resources to achieving the biologically realistic targets for these sites even if the timelines are extended.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
The unusually low 78% amino acid identity between the orthologous human SLC26A6 and mouse slc26a6 polypeptides prompted systematic comparison of their anion transport functions in Xenopus oocytes. ...Multiple human SLC26A6 variant polypeptides were also functionally compared. Transport was studied as unidirectional fluxes of (36)Cl(-), (14)Coxalate, and (35)Ssulfate; as net fluxes of HCO(3)(-) by fluorescence ratio measurement of intracellular pH; as current by two-electrode voltage clamp; and as net Cl(-) flux by fluorescence intensity measurement of relative changes in extracellular and intracellular Cl(-). Four human SLC26A6 polypeptide variants each exhibited rates of bidirectional (14)Coxalate flux, Cl(-)/HCO(3)(-) exchange, and Cl(-)/OH(-) exchange nearly equivalent to those of mouse slc26a6. Cl(-)/HCO(3)(-) exchange by both orthologs was cAMP-sensitive, further enhanced by coexpressed wild type cystic fibrosis transmembrane regulator but inhibited by cystic fibrosis transmembrane regulator DeltaF508. However, the very low rates of (36)Cl(-) and (35)Ssulfate transport by all active human SLC26A6 isoforms contrasted with the high rates of the mouse ortholog. Human and mouse orthologs also differed in patterns of acute regulation. Studies of human-mouse chimeras revealed cosegregation of the high (36)Cl(-) transport phenotype with the transmembrane domain of mouse slc26a6. Mouse slc26a6 and human SLC26A6 each mediated electroneutral Cl(-)/HCO(3)(-) and Cl(-)/OH(-) exchange. In contrast, whereas Cl(-)/oxalate exchange by mouse slc26a6 was electrogenic, that mediated by human SLC26A6 appeared electroneutral. The increased currents observed in oocytes expressing either mouse or human ortholog were pharmacologically distinct from the accompanying monovalent anion exchange activities. The human SLC26A6 polypeptide variants SLC26A6c and SLC26A6d were inactive as transporters of oxalate, sulfate, and chloride. Thus, the orthologous mouse and human SLC26A6 proteins differ in anion selectivity, transport mechanism, and acute regulation, but both mediate electroneutral Cl(-)/HCO(3)(-) exchange.
Independent Learning is necessary and important to support problem-solving skills and critical thinking skills in learning physics. The demands of the curriculum and the development of globalization ...require universities to make innovations that are beneficial for the world of 21st-century skills-based education. The study aims to develop Optics Virtual Laboratory (OVL) Based on Physics Independent Learning (PIL) For Improving Critical Thinking Skills. The research method in developing OVL utilizes the ADDIE Model which comprises the Analysis, Design, Development, Implementation, and Evaluate Phase. The research Sample remained 38 students who were studying physics and optical geometry concepts at one of the public universities in the central part of Indonesia. The results of the OVL media validation research show that in the material aspect the average value is 82% with a good interpretation and the media aspect has a median value of 90% with a good interpretation. The Gain test scores of OVL application in improving Critical Thinking Skill. The results have increased by 0.66 with a moderate category. It was concluded that OVL with the PIL model could improve students’ critical thinking skills (CTS).
The biodiversity of forest ecosystems is closely related to their ecosystem functions and represents a good indicator of the plant community dynamics, including various disturbances. Quantitative ...biodiversity estimates produced for larch forests of Siberia and the Far East growing in permafrost conditions and affected by fires on a regular basis are scarce. The purpose of this study was to perform a quantitative assessment of biodiversity in larch phytocoenoses of Amur oblast and the Republic of Sakha (Yakutia) and identify correlations between forest growth conditions and diversity indices. The biodiversity of forest stands and the live ground cover (ground vegetation) was examined on temporary sampling plots (SPs) established in larch forests on a transect 1500 km long passing through Amur oblast and Yakutia. Geobotanical descriptions of the ground cover were produced, and an inventory of forest stands was performed. Based on these data, the total number of species was determined; in addition, projective covers were determined and Shannon indices computed for individual elements of the forest stand, undergrowth, understory, and live ground cover. Floristic similarity between sampling plots was estimated using the Jaccard index. Principal component analysis (PCA) was used to ordinate the described communities. The studied forests grow in permafrost conditions, and their productivity is relatively low (the average timber volume is 131.3 ± 16.6 m
3
ha
–1
; the average density is 913.0 ± 130.8 units ha
–1
). The total number of species per SP varies from 10 to 49 and correlates neither with latitude nor with altitude. Species specific to Amur oblast and Yakutia were distinguished. A pairwise comparison of sampling plots showed that the Jaccard floristic similarity index decreases as the distance between plots increases, which indicates the key role of the geographical factor in the structure of plant communities. The group of environmental factors does not have a statistically significant relationship with the group of diversity indices; however, one-way regression analysis revealed a statistically significant linear correlation between air temperature and projective cover of the ground vegetation (live ground cover). Forest stand characteristics demonstrate a statistically significant linear relationship with diversity indices of subcanopy vegetation. The Shannon index computed for the tree stand correlates with the number of species in the live ground cover (
R
2
= 0.58), while the total number of species depends on the timber volume (
R
2
= 0.27). Tree stand condition is the main factor affecting floristic diversity in forests. In the eastern part of Amur oblast and in southern Yakutia, larch forests are distinguished by very low species richness: in many cases, they are almost 100% formed by larch; even in mixed stands, the proportion of larch is at least 70%. The total number of plant species varies from 10 to 49. The diversity of subcanopy shrub and herbaceous vegetation heavily depends on the forest stand condition: the maximum species richness was recorded in stands with the maximum timber volume. In pure larch forests, floristic diversity is lower compared to mixed larch forests. Climatic and relief parameters do not affect biodiversity indices. Floristic similarity between sampling plots decreases as distance between them increases. Compared to the southern part of the Far East, diversity and productivity parameters of forests growing in the study area are several times lower.
This study of the dissemination of Virtual Microscopic Simulation (VMS) to Sparking Innovation in STEM Education for Facilitating 21
st
-Century Skills (21-CS). The method applied to present work ...principles and critical parts of Virtual Microscopic Simulation (VMS) Media Education is a mixture of informative and utilizing the Interactive Lecture Demonstration (ILD) method. The number sample of participants of 41 physics teachers with VMS. The results showed that the 21-CS skills questionnaire of teachers and students’ perceptions of their understanding of 21st-century skills. These results can reveal that VMS with a STEM approach provides a positive relationship to practice 21
st
-century skills for teachers. Based on these results, the simple impact is when teachers have strong perceptions about problem-solving, critical thinking, collaboration, communication, and creativity, through STEM and VMS media.
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