In search of reality: Unraveling the myths about tracking, ability grouping and the gifted

Roeper Review ◽  
1993 ◽  
Vol 16 (1) ◽  
pp. 4-7 ◽  
Author(s):  
Ellen D. Fiedler ◽  
Richard E. Lange ◽  
Susan Winebrenner
Roeper Review ◽  
2002 ◽  
Vol 24 (3) ◽  
pp. 108-111 ◽  
Author(s):  
Ellen D. Fiedler ◽  
Richard E. Lange ◽  
Susan Winebrenner

Author(s):  
Jennifer L. Hochschild ◽  
Nathan Scovronick

Why is education policy so contentious? Do conflicts over specific issues in schooling have anything in common? Are there general principles that can help us resolve these disputes? In this book the authors find the source of many debates over schooling in the multiple goals and internal contradictions of the national ideology we call the American dream. They also propose a framework for helping Americans get past acrimonious debates in order to help all children learn. The American Dream and the Public Schools examines issues that have excited and divided Americans for years, including desegregation, school funding, testing, vouchers, bilingual education, multicultural education, and ability grouping. These seem to be separate problems, but much of the contention over them comes down to the same thing--an apparent conflict, rooted in the American dream, between policies designed to promote each student's ability to pursue success and those designed to insure the good of all students or the nation as a whole. The authors show how policies to promote individual success too often benefit only those already privileged by race or class, and too often conflict, unnecessarily, with policies that are intended to benefit everyone. The book also examines issues such as creationism and Afrocentrism, where the disputes lie between those who attack the validity of the American dream and those who believe that such a challenge has no place in the public schools. At the end of the book, the authors examine the impact of our nation's rapid racial and ethnic transformation on the pursuit of all of these goals, and they propose ways to make public education work better to help all children succeed and become the citizens we need.


Author(s):  
Yan Ti ◽  
Kangcheng Zheng ◽  
Wanzhong Zhao ◽  
Tinglun Song

To improve handling and stability for distributed drive electric vehicles (DDEV), the study on four wheel steering (4WS) systems can improve the vehicle driving performance through enhancing the tracking capability to desired vehicle state. Most previous controllers are either a large amount of calculation, or requires a lot of experimental data, these are relatively time-consuming and laborious. According to the front and rear wheel steering angle of DDEV can be distributed independently, a novel controller named internal model controller with fractional-order filter (IMC-FOF) for 4WS systems is proposed and studied in this paper. The IMC-FOF is designed using the internal model control theory and compared with IMC and PID controller. The influence of time constant and fractional-order parameters which is optimized using quantum genetic algorithms (QGA) on tracking ability of vehicle state are also analyzed. Using a production vehicle as an example, the simulation is performed combining Matlab/Simulink and CarSim. The comparison results indicated that the proposed controller presents performance to distribute the front and rear wheel steering angle for ensuring better tracking capability to desired vehicle state, meanwhile it possesses strong robustness.


Pharmaceutics ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 590
Author(s):  
Jennifer Cauzzo ◽  
Nikhil Jayakumar ◽  
Balpreet Singh Ahluwalia ◽  
Azeem Ahmad ◽  
Nataša Škalko-Basnet

The rapid development of nanomedicine and drug delivery systems calls for new and effective characterization techniques that can accurately characterize both the properties and the behavior of nanosystems. Standard methods such as dynamic light scattering (DLS) and fluorescent-based assays present challenges in terms of system’s instability, machine sensitivity, and loss of tracking ability, among others. In this study, we explore some of the downsides of batch-mode analyses and fluorescent labeling, while introducing quantitative phase microscopy (QPM) as a label-free complimentary characterization technique. Liposomes were used as a model nanocarrier for their therapeutic relevance and structural versatility. A successful immobilization of liposomes in a non-dried setup allowed for static imaging conditions in an off-axis phase microscope. Image reconstruction was then performed with a phase-shifting algorithm providing high spatial resolution. Our results show the potential of QPM to localize subdiffraction-limited liposomes, estimate their size, and track their integrity over time. Moreover, QPM full-field-of-view images enable the estimation of a single-particle-based size distribution, providing an alternative to the batch mode approach. QPM thus overcomes some of the drawbacks of the conventional methods, serving as a relevant complimentary technique in the characterization of nanosystems.


2013 ◽  
Vol 58 (1) ◽  
pp. 51-68 ◽  
Author(s):  
Katharina Vogl ◽  
Franzis Preckel

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