Sensing and Making Sense最新文献

Frontmatter

Sensing and Making Sense Pub Date : 2020-12-31 DOI: 10.14361/9783839453315-fm

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Abstract 摘要。

Sensing and Making Sense Pub Date : 2020-12-31 DOI: 10.1515/9783839453315-001

E. Tavabi, S. Koutchmy, A. Ajabshirizadeh

{"title":"Abstract","authors":"E. Tavabi, S. Koutchmy, A. Ajabshirizadeh","doi":"10.1515/9783839453315-001","DOIUrl":"https://doi.org/10.1515/9783839453315-001","url":null,"abstract":"Spicules are an important very dynamical and rather cool structure extending between the solar surface and the corona. They are partly filling the space inside the chromosphere and they are surrounded by a transition thin layer. New space observations taken with the SOT of the Hinode mission shed some light on their still mysterious formation and dynamics. Here we restrict the analysis to the most radial and the most interesting polar spicules situated at the base of the fast solar wind of coronal holes. We consider a first important parameter of spicules as observed above the solar visible limb: their apparent diameter as a function of the height above the limb which determines their aspect ratio and leads to the discussion of their magnetic origin using the flux tube approximation. We found that indeed spicules show a whole range of diameters, including unresolved “interacting spicules” (I-S), depending of the definition chosen to characterize this ubiquitous dynamical phenomenon occurring into a low coronal surrounding. Superposition effects along the line of sight have to be taken into account in order to correctly measure individual spicules and look at I-S. We take advantage of the so-called Madmax operator to reduce these effects and improve the visibility of these hair-like features. An excellent time sequence of images obtained above a polar region with the Hinode SOT through the HCaII filter with a cadence of 8 s was selected for analysis. 1-D Fourier amplitude spectra (AS) made at different heights above the limb are shown for the first time. A definite signature in the 0.18 to 0.25 Mm range exists, corresponding to the occurrence of the newly discovered type II spicules and, even more impressively, large Fourier amplitudes are observed in the 0.3 to the 1.2 Mm range of diameters and spacing, in rough agreement with what historical works were reporting. Additionally, some statistically significant behavior, based on AS computed for different heights above the limb, is discussed. “Time slice or x-t diagrams” revealing the dynamical behavior of spicules are also analyzed. They show that most of spicules have multiple structures (similarly to the doublet spicules) and they show impressive transverse periodic fluctuations which were interpreted as upward kink or Alfven waves. Evidence of the helical motion in spicules is now well evidenced, the typical periods of the apparent oscillation being around 120 sec. A fine analysis of the timeslice diagram as a function of the effective heights shows an interesting new feature near the 2 Mm height. We speculate on the interpretation of this feature as being a result of the dynamical specificities of the spicule helical motion as seen in these unprecedented high resolution HCaII line emission time series. PACS: 96.60._j","PeriodicalId":322037,"journal":{"name":"Sensing and Making Sense","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126483256","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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List of figures 数字清单

Sensing and Making Sense Pub Date : 2020-12-31 DOI: 10.14361/9783839453315-009

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Frontmatter

Sensing and Making Sense Pub Date : 2020-12-31 DOI: 10.1515/9783839453315-fm

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Chapter 2 第二章

Sensing and Making Sense Pub Date : 2020-12-31 DOI: 10.14361/9783839453315-006

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List of figures 数字清单

Sensing and Making Sense Pub Date : 2020-12-31 DOI: 10.1515/9783839453315-009

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Chapter 1 第一章

Sensing and Making Sense Pub Date : 2020-12-31 DOI: 10.1515/9783839453315-005

Shaobing Su, C. Tam, Lihua Chen, D. Lin

{"title":"Chapter 1","authors":"Shaobing Su, C. Tam, Lihua Chen, D. Lin","doi":"10.1515/9783839453315-005","DOIUrl":"https://doi.org/10.1515/9783839453315-005","url":null,"abstract":"Currently, there are over 27 million rural-to-urban migrant children in China who have migrated from rural villages to urban areas with their parent(s) or relatives without attaining permanent urban residency for the restricted household registration (―Hukou‖) system. The educational issues among migrant children in urban areas have attracted more and more attention from the government and society. This chapter is organized into four sections to review the history, special issues and situation, challenges and recommendations for the schooling of rural migrant children in China. The first section describes the historical aspects of migrant children‘s schooling, including original development, official documents promulgated for education of migrant children, the progress of compulsory education and the efficiency of schooling for migrant children since the 1990s. The second section aims to present some special issues and situations regarding migrant children‘s schooling, which comprises several aspects, such as mobility, family environment, schooling situations of migrant children in public schools and characteristics and conditions of migrant children schools (MCS). The third section summarizes barriers and challenges in the schooling of migrant children by using the existing literature and official reports to describe the inequality of educational opportunity, the challenges of educational placement and the challenges of educational advancement. The final section discusses some practical and policy recommendations to improve the schooling of migrant children, which include reforming the household registration system; implementing policies on educational advancement; strengthening the acceptance of public schools; advancing the schooling enrollment management system; and enhancing regulatory oversight and supports for MCS, thus eliminating stigma and improving parenting skills. * E-mail address: danhualin@bnu.edu.cn Shaobing Su, Cheuk Chi Tam, Lihua Chen et al. 250 1. HISTORICAL ASPECTS OF MIGRANT CHILDREN’S SCHOOLING IN CHINA","PeriodicalId":322037,"journal":{"name":"Sensing and Making Sense","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133324219","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Kurzfassung 言简意赅

Sensing and Making Sense Pub Date : 2009-12-31 DOI: 10.1007/978-3-658-26107-8_32

H. Proff

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Chapter 3 第三章

Sensing and Making Sense Pub Date : 1909-12-31 DOI: 10.4337/9781785361333.00006

L. M. Veth-Tello, L. W. Neuteboom, J. Pinas, P. Hooykaas, B. J. Zaal

{"title":"Chapter 3","authors":"L. M. Veth-Tello, L. W. Neuteboom, J. Pinas, P. Hooykaas, B. J. Zaal","doi":"10.4337/9781785361333.00006","DOIUrl":"https://doi.org/10.4337/9781785361333.00006","url":null,"abstract":"AIR1A, AIR1B and AIR3 are three auxin-responsive genes from Arabidopsis that are expressed in the outer cell layers of the root at sites of lateral root emergence. The expression of these genes is not directly regulated by auxin but mediated by a secondary messenger. In order to identify this secondary messenger we investigated the effects of known signaling factors/molecules on the expression of AIR::GUS reporter genes. Using two ethylene-insensitive mutant backgrounds, we found that the expression of AIR1 and AIR3 genes is ethylene-independent. Unexpectedly, methyl jasmonate (MeJA) led to increased AIR1::GUS expression with an expression pattern and intensity indistinguishable from that observed after auxin induction. The expression of AIR1::GUS and AIR3::GUS genes in mutants defective in auxin and jasmonate signaling was also studied. In alf4-1, a mutant impaired in lateral root formation, MeJA only poorly induced the expression of the AIR1::GUS gene. In the slr-1 mutant however there was normal induction of the gene by MeJA. In the MeJAinsensitive mutant coi1-1 the normal expression pattern of AIR1 was observed but the enhanced expression of AIR1 after auxin or MeJA stimulation was blocked. We propose that the auxin-induced expression of AIR1 is mediated by MeJA, which activates the SCF machinery for the degradation of proteins repressing the expression of the AIR1 gene. Unexpectedly, the AIR3 gene turned out not to be responsive to MeJA. Thus the secondary signal triggering the auxin-induced expression of the AIR3 gene remains unknown.","PeriodicalId":322037,"journal":{"name":"Sensing and Making Sense","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1909-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127776972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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