Does generating examples aid proof production?

Many mathematics education researchers have suggested that asking learners to generate examples of mathematical concepts is an effective way of learning about novel concepts. To date, however, this suggestion has limited empirical support. We asked undergraduate students to study a novel concept by either tackling example generation tasks or reading worked solutions to these tasks. Contrary to suggestions in the literature, we found no advantage for the example generation group on subsequent proof production tasks. From a second study, we found that undergraduate students overwhelmingly adopt a trial and error approach to example generation and suggest that different example generation strategies may result in different learning gains. We conclude by arguing that the teaching strategy of example generation is not yet understood well enough to be a viable pedagogical recommendation

The management of tree genetic resources and the livelihoods of rural communities in the tropics: non-timber forest products, smallholder agroforestry practices and tree commodity crops

Products and services provided by trees in forests and farmland support the needs and promote the wellbeing of hundreds of millions of people in the tropics. Value depends on managing both the diversity of tree species present in landscapes and the genetic variation within these species. The benefits from trees and their genetic resources are, however, often not well quantified because trade is frequently outside formal markets, there is a multiplicity of species and ways in which trees are used and managed, and genetic diversity within species is frequently not given proper consideration. We review here what is known about the value of trees to rural communities through considering three production categories: non-timber products harvested from trees in natural and managed forests and woodlands; the various products and services obtained from a wide range of trees planted and/or retained in smallholders’ agroforestry systems; and the commercial products harvested from cultivated tree commodity crops. Where possible, we focus on the role of intra-specific genetic variation in providing support to livelihoods, and for each of the three production categories we also consider wider conservation and sustainability issues, including the linkages between categories in terms of management. Challenges to ‘conventional wisdom’ on tree resource use, value and management – such as in the posited links between commercialisation, cultivation and conservation – are highlighted, and constraints and opportunities to maintain and enhance value are described

Pengaruh Experiental Marketing Dan Emotional Marketing Terhadap Keputusan Pembelian (Survei Konsumen Sepatu Nike Di Indonesia Dan Di Malaysia)

This research aims to understandOand determineOthe influence of variable experiential_marketing and emotional marketing on purchasePdecision partially, and to understand and{{determine the differences from the influence of experiential2marketing and9emotional marketing on purchase decision between consumer in Indonesia and in Malaysia. Type of thisjresearch))is 0explanatory research_with quantitativeplapproach. This researchddhave ajkvariables, there aref is Experient Marketing,Emotional Marketing, and Purchase Decision. Population inothis research is consumer Nike shoes in Indonesia and in Malaysia. The sample used in this research was 113 peoples, then sampling technique uses quota sampleand data collection methods questionnaire method. Data analysis on this research used by regression analysis and independentdfsample t-test. The resultsdjof independent sample t-test is, Experiential Marketing has significant influence to Purchase Decision, and also Emotional Marketing has significant influence to Purchase Decision. The result from independent sample t-test shows there is no significant differences of experiential marketing and emotional marketing influence on purchase decision betwee n Indonesian consumer and Malaysian consumer. Based on the result, Nike should increase their design of the shoes in order to get attention from consumer and increasing positive experience, also Nike should do an emotional approaching for their consumer by maintain their brand. Keyword: Experiential Marketing,_Emotional Marketing, Purchase Decision,Indonesia, Malaysia ABSTRAK Tujuan pada penelitian kali ini,untuk mengetahui dandfhmenjelaskanffpengaruhfjexperiential marketingdanfjemotional marketing terhadap variabel keputusan pembelian secaraparsial,jfdan juga untuk mengetahui & dan menjelaskan perbedaan pengaruh experient marketing dan juga emotional marketing terhadap & keputusan pembelian antara konsumen di Indonesia dan di Malaysia. Penelitian kali ini berupa penelitian penjelasan menggunakan pendekatan kuantitatif. Penelitian kali ini mempunyai variabel, yakni Experiential Marketing, Emotional Marketing, dan Keputusan Pembelian. Populas penelitian ini adalah konsumen sepatu Nike Indonesiadan di Malaysia. Sampel yang digunakan dalam penelitian ini sebanyak 113 orang responden yang diambil, dan teknik pengambilannya berupa sampel kuota dan metode pengumpulan data menggunakan angket. Analisis data yang digunakan & adalah analisis regresi linier dan indepent sample t-test. Hasil analisis kali ini didapatkan bahwa terdapat sebuah pengaruh signifikan antara variabel Experiential Marketing terhadap Keputusan Pembelian, dan juga pada variabel Emotional Marketing terhadap Keputusan Pembelian. Hasil analisis uji beda independent t-test menujukkan tidak terdapat perbedaan pengaruh yang signifikan pada experiential marketing dan juga emotional_marketing terhadap keputusan pembelian antara konsumen di Indonesia dan di Malaysia. Berdasarkan hasil penelitian ini sebaiknya Nike diharapkan mampu meningkatkan model sepatunya untuk menarik konsumen dan menambah pengalaman positif kosumen, dan mendekatkan kepada sisi emosional konsumen melalui pendekatan merek_Nike.Inc Kata kunci: Experiential Marketing,Emotional Marketing, Purchase Decision, Indonesia, MalaysiaKeyword: Experiential Marketing,_Emotional Marketing, Purchase Decision,Indonesia, Malaysia ABSTRAK Tujuan pada penelitian kali ini,untuk mengetahui dandfhmenjelaskanffpengaruhfjexperiential marketingdfdanfjemotional marketing terhadap variabelfjkeputusanfjpembelianfjdsecara_parsial,jfdan juga untuk mengetahui&&danhkmenjelaskan perbedaanfjhpengaruh*experientialjkmarketing dan jugaoemotional marketingdhterhadap&keputusan pembelianooantara konsumen di Indonesia dan di Malaysia. Penelitian kali ini berupa penelitian penjelasan_menggunakan pendekatan kuantitatif. Penelitian_kali ini mempunyai variabel, yakni Experiential Marketing, Emotional Marketing, dan Keputusan Pembelian. Populasidjdpenelitiandjinidhdadalah konsumendjsepatu_Nikeujudi Indonesiadjdan didjjMalaysia. Sampel yangiiodigunakandjdalam penelitian&&inidjjsebanyak 113djdorang_responden yang diambil, dan_teknik pengambilannya berupa_sampel kuota dan metode pengumpulandjsdata menggunakan_angket.Analisiszdata yang digunakan&6adalah analisis regresi89linier dan indepent sample t-test. Hasil analisis kali ini didapatkan bahwa terdapat sebuah pengaruh signifikan antara variabel99ExperientialozMarketing00terhadap Keputusan Pembelian, dan juga pada variabel Emotional Marketing terhadap Keputusan Pembelian. Hasil analisis uji beda independent t-test menujukkan tidak terdapat perbedaan pengaruh yang signifikan pada experiential marketing dan juga emotional_marketing terhadap keputusan pembelian antara konsumen di Indonesia dan di Malaysia. Berdasarkan hasil penelitian ini sebaiknya Nike diharapkan mampu meningkatkan model sepatunya untuk menarik konsumen dan menambah pengalaman positif kosumen, dan mendekatkan kepada sisi emosional konsumen melalui pendekatan merek_Nike.In

Novel NN interaction and the spectroscopy of light nuclei

Nucleon-nucleon (NN) phase shifts and the spectroscopy of $A \le 6$ nuclei are successfully described by an inverse scattering potential that is separable with oscillator form factors.Comment: 4 pages, 1 figure, 13 table

Hard-core Yukawa model for two-dimensional charge stabilized colloids

The hyper-netted chain (HNC) and Percus-Yevick (PY) approximations are used to study the phase diagram of a simple hard-core Yukawa model of charge-stabilized colloidal particles in a two-dimensional system. We calculate the static structure factor and the pair distribution function over a wide range of parameters. Using the statics correlation functions we present an estimate for the liquid-solid phase diagram for the wide range of the parameters.Comment: 7 pages, 9figure

Les isolants du VIVITRON

Les résultats de nombreux essais haute tension des différents isolants (composite verre-époxyde et plots) utilisés dans le VIVITRON sont reportés. Les tests de faisabilité d'une section accélératrice à l'échelle 1 sont décrits

Mixed state properties of superconducting MgB2 single crystals

We report on measurements of the magnetic moment in superconducting MgB2 single crystals. We find \mu_0H_{c2}^c(0) = 3.2 T, \mu_0H_{c2}^{ab}(0) = 14.5 T, \gamma = 4.6, \mu_0H_c(0) = 0.28 T, and \kappa(T_c) = 4.7. The standard Ginzburg-Landau and London model relations lead to a consistent data set and indicate that MgB2 is a clean limit superconductor of intermediate coupling strength with very pronounced anisotropy effects