Facebook网络巡警

一个阳光正午,就快到午饭时间,在位于加州帕洛阿尔托的Facebook公司总部内,西蒙·阿克顿正在寻找色情图片。一对年轻人热恋缠绵的照片映人屏幕。这张图片赋予挑逗性,但是并不违规,阿克顿一边点击键盘,一边评判图片是否合适。下一幅图片：一个只穿着短内裤的年轻女子,用手遮着胸部。     

Social Perception in Infancy: A Near Infrared Spectroscopy Study

The capacity to engage and communicate in a social world is one of the defining characteristics of the human species. While the network of regions that compose the social brain have been the subject of extensive research in adults, there are limited techniques available for monitoring young infants. This study used near infrared spectroscopy to investigate functional activation in the social brain network of 36 five-month-old infants. We measured the hemodynamic responses to visually presented stimuli in the temporal lobes. A significant increase in oxyhemoglobin was localized to 2 posterior temporal sites bilaterally, indicating that these areas are involved in the social brain network in young infants.     

城市·身体·雕塑·行为艺术

2009年10月,英国伦敦人流穿梭的街道上,一群身着彩色帽T的家伙东奔西跑,他们像淘气的孩子般爬上爬下,把自己的身体挤进通道入口、壁凹和任何能找得到的公共建筑的缝隙内。街上的行人常常被他们的举动搞得一头雾水,目瞪口呆。     

Explicit instruction in orthographic structure and word morphology helps Chinese children learn to write characters

Previous research in alphabetic languages had shown that children learning to write are sensitive to morphological information, and that it serves as a resource that they draw upon as they acquire writing skills. In Chinese as well, sensitivity to morphological and orthographic information had been found to predict children’s ability to read characters. The present study investigated whether raising children’s awareness of the morphemic and orthographic structure of Chinese words would lead to beneficial results in their learning to write Chinese. An experimental group of 144 first graders from two primary schools in Beijing, China were given instruction designed to increase their knowledge of the orthographic and morphological structure of Chinese words. After two semesters, the experimental group’s ability to copy Chinese characters and to write them from memory were both found to be significantly better than a control group. Theoretical implications are discussed, including how writing benefits from the types of linguistic knowledge that underlie lexical storage and retrieval in reading and speech. Educational implications are also discussed, such as how drawing children’s attention to the morphemic components of Chinese words and the systematic features of Chinese orthography provides them with multiple sources of information they may utilize in learning to write.     

Extending technologies among small-scale farmers in Meru,Kenya: Ingredients for success in farmer groups

Agricultural extension is evolving worldwide, and there is much emphasis today on community-based mechanisms of dissemination in order to bring sustainable change. The goal of this study was to examine the factors that make farmer groups successful in dissemination of information and technologies. A mixed-methods, multiple-stage approach was used to obtain data, using participant observation, documentary analysis, semi-structured interviews, social mapping, and structured questionnaires. Dairy-goat farmer groups (n = 46) and individual farmers (n = 88) were interviewed. Factors that were associated with group success in dissemination included member participation, degree of jealousy within the group, homogeneity of members, group capacity, number of linkages and type of group (project-supported versus non-supported). Some interventions that may increase the success of groups in dissemination include capacity-building, increasing linkages with other extension stakeholders, providing an enabling environment for groups to form, using established groups (as compared to forming new groups), and encouraging groups to form around common interests rather than for other reasons.     

A review of models of vertical,leg, and knee stiffness in adults for running,jumping or hopping tasks

Abstract

The ‘stiffness’ concept originates from Hooke's law which states that the force required to deform an object is related to a spring constant and the distance that object is deformed. Research into stiffness in the human body is undergoing unprecedented popularity; possibly because stiffness has been associated with sporting performance and some lower limb injuries. However, some inconsistencies surrounding stiffness measurement exists bringing into question the integrity of some research related to stiffness. The aim of this study was to review literature which describes how vertical, leg and knee stiffness has been measured in adult populations while running, jumping or hopping. A search of the entire MEDLINE, PubMed and SPORTDiscus databases and an iterative reference check was performed. Sixty-seven articles were retrieved; 21 measured vertical stiffness, 51 measured leg stiffness, and 22 measured knee stiffness. Thus, some studies measured several ‘types’ of stiffness. Vertical stiffness was typically the quotient of ground reaction force and centre of mass displacement. For leg stiffness it was and change in leg length, and for the knee it was the quotient of knee joint moments and change in joint angle. Sample size issues and measurement techniques were identified as limitations to current research.