Naturality of Heegaard Floer invariants under positive rational contact surgery

For a nullhomologous Legendrian knot in a closed contact 3-manifold Y we consider a contact structure obtained by positive rational contact surgery. We prove that in this situation the Heegaard Floer contact invariant of Y is mapped by a surgery cobordism to the contact invariant of the result of contact surgery. In addition we characterize the spin-c structure on the cobordism that induces the relevant map. As a consequence we determine necessary and sufficient conditions for the nonvanishing of the contact invariant after rational surgery when Y is the standard 3-sphere, generalizing previous results of Lisca-Stipsicz and Golla. In fact our methods allow direct calculation of the contact invariant in terms of the rational surgery mapping cone of Ozsv\'ath and Szab\'o. The proof involves a construction called reducible open book surgery, which reduces in special cases to the capping-off construction studied by Baldwin.Comment: Extended the main results from surgery coefficients that are at least 1 to all positive surgery coefficients. This version to appear in Journal of Differential Geometr

Student induction experiences: Through the lens of gamification

Student induction serves as the first step of the learning journey, helping students understand the resources, facilities, and supporting infrastructures in the learning environment. A positive induction experience helps improve better learning efficacy and boost performance later on. However, students nowadays complain induction as boring, time-wasting and useless. Given the importance of induction, scholars have called for new research, finding a new way to deliver better-quality and more engaging induction. To respond to this call, the current research aims to investigate whether gamification offers better induction experiences to the students. Gamification is the use of game design techniques, game thinking, and game mechanics in a non-game context. Drawing on the student-centred learning theory, we propose that, through the game-play process, students shall feel less stressed but more confident in learning, leading to a more positive learning experience and outcome. Following the same logic, we hypothesise that gamification is positively correlated with the experiences of induction. That is, gamification-empowered induction brings better experiences to the new students. To examine the research hypothesis, we plan to recruit 200 students (research participants) through flyers and noticeboards during the university induction period in September 2023 (Ethics Approval Ref: ETH2223-0198). The recruitment is operated on a voluntary basis and participants can drop out at any time. Participant Information Letter, Consent Form, and other participant protection measures are arranged in line with the guidance of institutional ethics committee. The participants will be randomly assigned into two conditions. In Condition A, participants will receive a conventional induction through a regular teaching classroom. All documents and instructions are communicated through paper-based handouts. Participants will receive a campus map, explaining the location of buildings and respective services. The induction will be completed inside the classroom. In Condition B, participants will receive gamification-empowered induction. All documents and instructions are communicated through a gamification APP (to be installed in participants’ mobiles). To complete the induction, participants must visit the designated locations in the campus, exploring the services in person. To further understand participants' views and experiences of the induction, we plan to collect data through anonymous questionnaires surveys at the end of induction. Condition A will receive questions through web-based surveys, where Condition B will receive questions through APP-based surveys. Both conditions will receive the same survey questions, and Condition B will receive additional questions of APP-user experiences (A copy of the survey questions is enclosed in appendix). The data collected will be analysed and compared through SPSS and Excel software. Research findings will first and foremost examine whether gamification-empowered induction offers better induction experiences to the students. The answers will bring new insights to the gamification-induction literatures. Research findings will be important to the teaching practitioners and policy makers, particularly for those who wish to create better induction programmes through innovative strategies. Implications on induction design and delivery will be clarified. Research limitation and suggestions for future research will also be discussed

Generational Conflict, Human Capital Accumulation, and Economic Growth

Worldwide, dependency ratios are forecast to increase dramatically in the next 50 years. A great deal of attention has been devoted to understanding the changes in fiscal policies that must' take place to accommodate these changes. In contrast, less effort has been concentrated on studying the fiscal shifts that will endogenously result from demographic pressures. An example of particular interest is the degree to which a more elderly population will support public spending for education. We use an overlapping-generations model to investigate the effect of this demographic transition on the endogenous determination of public spending for education. A demographic transition alters the identity of the median voter, leading to a preference for less education spending. If the public sector is inefficiently small, demographic transition exacerbates the underprovision of human capital. Alternatively, such a shift may trim an inefficiently large government, reduce tax rates and raise capital per worker enough to raise education spending. Thus, there is no automatic link between demographic transition and reduced support for those programs whose benefits are concentrated among the young.

Electrical Impedance Tomography of Translationally Uniform Cylindrical Objects with General Cross-Sectional Boundaries

An algorithm is developed for electrical impedance tomography (EIT) of finite cylinders with general cross-sectional boundaries and translationally uniform conductivity distributions. The electrodes for data collection are assumed to be placed around a cross-sectional plane,- therefore the axial variation of the boundary conditions and also the potential field are expanded in Fourier series. For each Fourier component a two-dimensional (2-D) partial differential equation is derived. Thus the 3-D forward problem is solved as a succession of 2-D problems and it is shown that the Fourier series can be truncated to provide substantial saving in computation time. The finite element method is adopted and the accuracy of the boundary potential differences (gradients) thus calculated is assessed by comparison to results obtained using cylindrical harmonic expansions for circular cylinders. A 1016-element and 541-node mesh is found to be optimal. For a given cross-sectional boundary, the ratios of the gradients calculated for both 2-D and 3-D homogeneous objects are formed. The actual measurements from the 3-D object are multiplied by these ratios and thereafter the tomographic image is obtained by the 2-D iterative equipotential lines method. The algorithm is applied to data collected from phantoms, and the errors incurred from the several assumptions of the method are investigated. The method is also applied to humans and satisfactory images are obtained. It is argued that the method finds an “equivalent” translationally uniform object, the calculated gradients for which are the same as the actual measurements collected. In the absence of any other information about the translational variation of conductance this method is especially suitable for body parts with some translational uniformity. © 1990 IEE

Generational Conflict, Human Capital Accumulation, and Economic Growth

Worldwide, dependency ratios are forecast to increase dramatically in the next 50 years. A great deal of attention has been devoted to understanding the changes in fiscal policies that must take place to accommodate these changes. In contrast, less effort has been concentrated on studying the fiscal shifts that will endogenously result from demographic pressures. An example of particular interest is the degree to which a more elderly population will support public spending for education. We use an overlapping-generations model to investigate the effect of this demographic transition on the endogenous determination of public spending for education. A demographic transition alters the identity of the median voter, leading to a preference for less education spending. If the public sector is inefficiently small, demographic transition exacerbates the under provision of human capital. Alternatively, such a shift may trim an inefficiently large government, reduce tax rates, and raise capital per worker enough to raise education spending. Thus, there is no automatic link between demographic transition and reduced support for those programs whose benefits are concentrated among the young

Kırka Boraks atıklarının soda liçi

Bor, çok geniş kullanım alanları ile, insanlığın bugünkü ve gelecekteki yaşamlarında, vazgeçilmez bir endüstriyel hammadde olarak önemini gittikçe arttıracaktır. Ülkemiz bu açıdan şanslı bir konumda olup, toplam dünya bor rezervlerinin yaklaşık %60 'mı içermektedir Bu nedenlerden dolayı, bor cevherlerimizin en verimli bir şekilde üretimi ülkemiz açısından çok fazla önem arz etmektedir. Kırka boraks konsantratöründe, her yıl yaklaşık %10-12 B2O3 tenörlü 250 bin ton yaş artık oluşmakta ve bunun yanında artık göletinde de benzer tenörlü yaklaşık 4 milyon ton birikmiş katı artık bulunmaktadır. Artıkların teknolojik koşullara uygun olarak değerlendirilmesi gerekmektedir. Bu çalışmada, kırka boraks artıklarının soda liçi ile değerlendirilmesinde etken olan parametreler ayrıntılı bir şekilde araştırılmıştır. Bu amaçla, boraks artıklarının Na2C03 ve NaHCC>3 liçi; değişik sıcaklık, çözücü"miktarları, katı/sıvı oranlan ve çözeltine sürelerinde denenmiş olup, düşük çözücü oranlarında, optimal sıcaklık ve sürede başarılı sonuçlar alınmıştır. Sonuçta, seyreltik soda çözeltisi ile yapılan deneylerde, artiklardaki boraks yüksek verimle çözünmüş ve elde edilen bulgulardan yararlanılarak, tesisin mevcut çalışma koşullarına uygun optimum öneri akım şemalan geliştirilmiştir. Aynca, bu yöntemle boraks artıklarının değerlendirilmesinde, çözücü olarak tronanın kullanılması ile ülkemizde büyük bir potansiyele sahip olan trona yataklan yem bir kullanım alam bulmuş olacaktır.Boron will continue its importance in the recent world and in the future as a very well-known and necessary industrial rawmaterial with common use areas. Our country is very advantegeous in this point and contains approximately 60 % of total world reserves of boron. Thus production of boron ores is greatly significant for our country. In the Kırka Tincal Concentrator, approximately 250 000 tons wet tailings with a grade of 10 -12 % are produced and separately 4 million tons tailings with similar grade are disposed. Beneficiation from the Kırka Tincal tailings is thereby necessary. In this study, the effective parameters m soda leaching of the Kırka Tincal tailings have been investigated in detail. For this aim, Na2CC>3 and NaHCC>3 leaching of the tailings at different temperature, concentration, solid/liquid ratio and leaching time were carried out. As a conclusion, in the experiments made with aqueous soda solutions, tincal were efficiently extracted and an optimum processing plant proposal was developed. Furthermore, with use of trona in this processing method of the tailings, the great trona deposits will find a different use

Soil liquefaction potential in Eskişehir, NW Turkey

Liquefaction is one of the critical problems in geotechnical engineering. High ground water levels and alluvial soils have a high potential risk for damage due to liquefaction, especially in seismically active regions. Eskişehir urban area, studied in this article, is situated within the second degree earthquake region on the seismic hazard zonation map of Turkey and is surrounded by Eskişehir, North Anatolian, Kütahya and Simav Fault Zones. Geotechnical investigations are carried out in two stages: field and laboratory. In the first stage, 232 boreholes in different locations were drilled and Standard Penetration Test (SPT) was performed. Test pits at 106 different locations were also excavated to support geotechnical data obtained from field tests. In the second stage, experimental studies were performed to determine the Atterberg limits and physical properties of soils. Liquefaction potential was investigated by a simplified method based on SPT. A scenario earthquake of magnitude <i>M</i>=6.4, produced by Eskişehir Fault Zone, was used in the calculations. Analyses were carried out for PGA levels at 0.19, 0.30 and 0.47 g. The results of the analyses indicate that presence of high ground water level and alluvial soil increase the liquefaction potential with the seismic features of the region. Following the analyses, liquefaction potential maps were produced for different depth intervals and can be used effectively for development plans and risk management practices in Eskişehir

Perceived economic self‑sufficiency: a countryand generation‑comparative approach

We thank Michael Camasso and Radha Jagannathan as well as Asimina Christoforou, Gerbert Kraaykamp, Fay Makantasi, Tiziana Nazio, Kyriakos Pierrakakis, Jacqueline O’Reilly and Jan van Deth for their contribution to the CUPESSE project (Seventh Framework Programme; Grant Agreement No. 61325). CUPESSE received additional funding from the Mannheim Centre for European Social Research (MZES) and the Field of Focus 4 “Self-Regulation and Regulation: Individuals and Organisations” at Heidelberg University. We further acknowledge helpful comments on this article by two anonymous reviewers. Julian Rossello provided valuable research assistance.Electronic supplementary material The online version of this article (https ://doi.org/10.1057/ s4130 4-018-0186-3) contains supplementary material, which is available to authorized users.Existing datasets provided by statistical agencies (e.g. Eurostat) show that the economic and financial crisis that unfolded in 2008 significantly impacted the lives and livelihoods of young people across Europe. Taking these official statistics as a starting point, the collaborative research project “Cultural Pathways to Economic Self-Sufficiency and Entrepreneurship in Europe” (CUPESSE) generated new survey data on the economic and social situation of young Europeans (18–35 years). The CUPESSE dataset allows for country-comparative assessments of young people’s perceptions about their socio-economic situation. Furthermore, the dataset includes a variety of indicators examining the socio-economic situation of both young adults and their parents. In this data article, we introduce the CUPESSE dataset to political and social scientists in an attempt to spark a debate on the measurements, patterns and mechanisms of intergenerational transmission of economic self-sufficiency as well as its political implications.CUPESSE project (Seventh Framework Programme; Grant Agreement No. 61325