免费开放环境下公共图书馆服务面临的挑战与创新路径

面对免费开放政策带来的服务观念、服务需求、服务规则及设施等方面的挑战,公共图书馆应该主动应对、化挑战为机遇,创新公共服务方式,完善规章制度,整合业务流程,调配服务资源,拓展服务领域,提升职业素养,提高公共服务能力。     

基于Verilog HDL的逻辑分析仪电路设计

本文设计的是一个基于Verilog HDL的简易逻辑分析仪电路,在满足触发条件时,对被测信号进行采集、存储、并在示波器上显示所采集到的信号波形和时间标志线。在该逻辑分析仪电路中,所有信号都与时间相关,从而可以观察到时间的设置与保持、脉冲宽度、外部丢失的数据关系、也能够帮助我们实施数字硬件故障检测。     

电阻率剖面法对称四极装置视电阻率曲线分析

各向同性均匀半空间中球体异常的电阻率对称四极剖面法视电阻率曲线,当极距较大时,低阻球体正上方会出现一个极小值,高阻球体正上方会出现极大值,前人文献基本上是这样描述的.但是当供电极距减小到2.5倍球体半径以下时,类似偶极装置的视电阻率曲线,低阻球体在球心地面映射点不会出现极小值,而是出现一个局部极大值,视电阻率最小值在球心两侧对称出现;高阻球体在球心地面映射点上不会出现极大值,而是出现一个局部极小值,视电阻率最大值在球心两侧对称出现.     

Bandpass sorting of heterogeneous cells using a single surface acoustic wave transducer pair

Separation and sorting of biological entities (viruses, bacteria, and cells) is a critical step in any microfluidic lab-on-a-chip device. Acoustofluidics platforms have demonstrated their ability to use physical characteristics of cells to perform label-free separation. Bandpass-type sorting methods of medium-sized entities from a mixture have been presented using acoustic techniques; however, they require multiple transducers, lack support for various target populations, can be sensitive to flow variations, or have not been verified for continuous flow sorting of biological cells. To our knowledge, this paper presents the first acoustic bandpass method that overcomes all these limitations and presents an inherently reconfigurable technique with a single transducer pair for stable continuous flow sorting of blood cells. The sorting method is first demonstrated for polystyrene particles of sizes 6, 10, and 14.5 μm in diameter with measured purity and efficiency coefficients above 75 ± 6% and 85 ± 9%, respectively. The sorting strategy was further validated in the separation of red blood cells from white blood cells and 1 μm polystyrene particles with 78 ± 8% efficiency and 74 ± 6% purity, respectively, at a flow rate of at least 1 μl/min, enabling to process finger prick blood samples within minutes.     

Optimum calibration of a parallel kinematic manipulator using digital indicators

This paper presents a calibration method for parallel manipulators using a measurement system specially installed on an external fixed frame. The external fixed frame is important as an error reference for calibration in certain operations, such as in the configuration of a parallel manip- ulator functioning as a machine tool where the workpiece is fixed to a worktable. The pose of the end-effector is mea- sured using three digital indicators installed on the external fixed frame. To enable measurement, the end-effector is assumed to be a plane large enough that all digital indicators could touch. The error is defined as the difference between the theoretical and actual readings of the digital indicators. The geometric parameters of the parallel manipulator are optimized to minimize this error. This calibration method is low cost and feasible for compensating geometric parameter errors for a parallel manipulator. Optimal pose selection for the calibration is achieved using a swarm intelligence search algorithm. The method is implemented on a prototype of a six degrees-of-freedom （DOFs） Gough-Stewart platform constructed to function as a machine tool.     

Student learning performance in online collaborative learning

Education and Information Technologies - Online collaborative learning (OCL) has received significant attention, but the ultimate goal of adopting OCL is neglected, especially in higher education...     

Innovative students’ academic advising for optimum courses’ selection and scheduling assistant: A Blockchain based use case

Education and Information Technologies - Advising students through their study plans is one of the essential steps towards academic success. The matching of students’ needs and courses...     

Determination of clinically relevant content for a musculoskeletal anatomy curriculum for physical medicine and rehabilitation residents

To address the need for more clinical anatomy training in residency education, many postgraduate programs have implemented structured anatomy courses into their curriculum. Consensus often does not exist on specific content and level of detail of the content that should be included in such curricula. This article describes the use of the Delphi method to identify clinically relevant content to incorporate in a musculoskeletal anatomy curriculum for Physical Medicine and Rehabilitation (PM&R) residents. A two round modified Delphi involving PM&R experts was used to establish the curricular content. The anatomical structures and clinical conditions presented to the expert group were compiled using multiple sources: clinical musculoskeletal anatomy cases from the PM&R residency program at the University of Toronto; consultation with PM&R experts; and textbooks. In each round, experts rated the importance of each curricular item to PM&R residency education using a five‐point Likert scale. Internal consistency (Cronbach's alpha) was used to determine consensus at the end of each round and agreement scores were used as an outcome measure to determine the content to include in the curriculum. The overall internal consistency in both rounds was 0.99. A total of 37 physiatrists from across Canada participated and the overall response rate over two rounds was 97%. The initial curricular list consisted of 361 items. After the second iteration, the list was reduced by 44%. By using a national consensus method we were able to objectively determine the relevant anatomical structures and clinical musculoskeletal conditions important in daily PM&R practice. Anat Sci Educ 7: 135–143. © 2013 American Association of Anatomists.