Effects of GO FASTER on Morpheme Definition Fluency for High School Students with High‐Incidence Disabilities

Although vocabulary plays an important role in literacy and content instruction, there is a paucity of research identifying effective methods for teaching vocabulary. One promising strategy is morphemic analysis, which involves breaking words into morphemes, the smallest meaningful parts of words, and teaching students the meanings of those parts. The current study used a multiple probe across morphemes experimental design to determine the effects of an intervention package, GO FASTER (G raphic O rganizers; F lashcards A dded up and S elf‐graphed to T rack progress; E rrors R eviewed). Findings showed that with three to four instructional sessions, three high school students with high‐incidence disabilities successfully defined morphemes at a predetermined fluency rate and generalized these definitions to untaught words. Implications for practice and future research are discussed.     

Powerful tasks: A contribution to a high level of acting and reflecting in mathematics instruction

Mathematics instruction contains two conflicting demands: on the one hand, the demand for economical efficiency and for well-developed motorways and, on the other hand, the demand that pupils should investigate and discover for themselves and have the freedom to pave their own ways. It is argued that tasks with a certain richness and quality offer some steps towards a constructive handling of this dilemma. The author tries to develop some properties of powerful tasks and to sketch the structure and philosophy of one concrete system of powerful tasks for the concept of angle. The main part of this paper presents seven examples of powerful tasks: five from the system of tasks and two with regard to pupils' working with 2-D-graphic systems. The construction of powerful tasks is viewed as a valuable contribution to bringing the theory and practice of mathematics education closer together.     

Possibilities of altering arm and shoulder muscle activation in a static therapeutic climbing exercise through arm position,hand support and wall inclination

The aim of the study was to quantify the activation of arm and shoulder muscles during a static therapeutic climbing exercise and to investigate the possibility of altering the muscle activation through arm position (Jug, Undercling, Sidepull internal rotated, Sidepull external rotated), hand support (one-handed, double-handed) and wall inclination (0°, 12°). Electromyographic (EMG) activity of 14 healthy, climbing unexperienced males for the right m. biceps brachii (BB), m. serratus anterior (SA), m. upper, middle and lower trapezius (UT, MT, LT) showed mainly low to moderate EMG activation levels (BB: 4.1–40.1% maximum voluntary isometric contraction (MVIC), SA: 4.5–24.5% MVIC, UT: 1.3–28.0% MVIC, MT: 8.6–47.1% MVIC, LT: 3.8–47.3% MVIC). Significant differences occurred between the four arm positions for the UT and LT. The one-handed support revealed significant higher muscle activation than the double-handed support in every condition except for SA in Undercling arm position at 12° wall inclination. Increasing the wall inclination (from 0° to 12° overhang) led to a significant increase in muscle activation in nearly every exercise variation and muscle. These findings suggest that arm position, hand support and wall inclination are appropriate possibilities of altering muscle activation patterns in therapeutic climbing.     

空间均匀低温氢气燃烧器开发（英文）

目的:设计制造低温的催化氢气燃烧器,并对其进行相关功能性测试。创新点:成功设计并制造出一个集成流量分配器的催化低温氢气燃烧器。方法:1.基于树状分叉方法,设计燃烧器的流量分配器,均匀分配气体到催化表面,并利用熔融沉积成型技术制备原型样机。2.基于测试结果,利用选择性激光熔化技术对燃烧器进行最优化设计。3.对设计的催化燃烧器的相关功能进行验证。结论:1.设计的低温催化燃烧器与传统的非催化燃烧器相比具有很多优势,尤其是实现了无焰均匀低温(约200°C)的产热;这一技术有望运用于化工领域的增材制造。2.本文不但用选择性激光熔融技术制备了最终产品,而且利用了熔融沉积成型技术进行快速的样机制备。3.催化剂多孔载体的调控和催化剂的负载方式研究有望进一步提升燃烧器的综合性能。     

Communications Technology

M.D. Fagan, A History of Engineering and Science in the Bell System: National Service in War and Peace, 1925-1975 (Bell Laboratories, - Whippany Rd., Whippany, N.J. 07981—$15.00).

Daniel M. Costigan Electronic Delivery of Documents and Graphics (New York: Van Nostrand Reinhold, 1978—$21.95)

Konrad K. Kalba, Electronic Message Systems: The Technological, Market and Regulatory Prospects (Cambridge, Mass.: Kalba Bowen Associates, 1978—$30.00, paper),

Starr Roxanne Hiltz and Murray Turoff, The Network Nation: Human Communication via Computer (Reading, Mass.: Addison-Wesley, 1978—$29.50/17.50)

Robert Johansen, Jacques Vallee and Kathleen Spangler, Electronic Meetings: Technical Alternatives and Social Choices (Reading, Mass.: Addison-Wesley, 1979—$15.95)     

Reflections on an Emerging Field: Researching Mathematics Teacher Education

This paper reports a survey of research in mathematics teacher education from 1999 to 2003 done by an international team of five mathematics educators and researchers. The survey included published research in international mathematics education journals, international handbooks of mathematics education and international mathematics education conference proceedings. Some regional sources from various parts of the world were also included. We investigated who was writing, from and in what settings, with what theoretical frameworks, and with what sorts of study designs for what core questions. We also examined the range of findings and conclusions produced in these studies. Our analysis presented here focuses on four themes that stood out from our initial investigation of almost 300 published papers, and systematically elaborated through a focused study of a 160 papers across key journals and conference proceedings in the field. From this vantage point, the paper offers a reflection on the current state of the field of mathematics teacher education research. Our aim is to stimulate discussion that can support the development of the field, not make final pronouncements about its nature. The research presented in this paper was done by five mathematics education researchers, the authors listed above, and presented at ICME10 in Copenhagen in July 2004. This Survey Team (Survey Team 3) was nominated by the International Program Committee for the Congress and asked to survey “Professional Development of Mathematics Teachers” and present this in a plenary at the Congress. A copy of the presentation can be viewed at: http://www.wits.ac.za/jadler/presentations.html. An earlier version of this paper will also appear in the ICME10 proceedings.     

Development of a spatially uniform low-temperature hydrogen combustor

Examples of the use of additive manufacturing and rapid prototyping in a range of applications are of great interest in order to emphasize their role in development and production technology. In this study, a catalytic low temperature burner for H₂ on a lab scale with an integrated flow distributor was designed, manufactured, and tested for functionality. Based on a theoretical approach, a flow distributor for the burner was designed and a prototype was built using fused deposition modeling (FDM). Based on test results, an optimized version of the burner was then designed and manufactured using selective laser melting (SLM). The functionality of the designed catalytic burner was proven. Several advantages were found in comparison to conventional non-catalytic burners. In particular, flameless uniform low temperature heat generation with temperatures of about 200 °C could be realized. This contribution highlights the potential of additive manufacturing in chemical engineering. Not only was the final product built using SLM, but also during the development process, FDM was used for rapid prototyping.