1、复旦大学中国历史地理研究中心，“中国历史地理信息系统”（CHGIS） http://yugong.fudan.edu.cn/views/chgis_index.php “CHGIS”项目由复旦大学中国历史地理研究中心和哈佛大学哈佛燕京学社等机构共同建置，可视为谭其骧主编《中国历史地图集》在数字时代的升级版。“CHGIS”试图建立一套中国历史时期连续变化的基础地理信息库，为研究者提供数据下载和地名查询等服务。 到目前为止，“CHGIS”已经发布到了4.0版，数据和功能均在持续提升。该项目不仅要连续描述…

1、美国国会图书馆，“中国地图” http://www.loc.gov/maps/?q=&fa=subject:china 现有资源五百余笔，其中包含恒慕义上世纪在中国收集后来捐赠给国会图书馆的那批中文地图。类型多样，总图如《大明一统山河图》、《大明舆地图》、《大清分省舆图》、《广舆图》等，城镇地图如《泉州府舆地图说》、《澳门地图》、《北京全图》、《北平市全图》、《北京市最新详细地图》、《最新实测上海地图》等；河运水利图如《山东运河全图》、《钱塘江沿岸图》、《豫省黄河全图》、《河南府河图》等。美国国会图…

How to Study Mathematics Lawrence Neff Stout, Department of Mathematics, Illinois Wesleyan University, Bloomington, Il 61702-2900 This essay describes a number of strategies for studying college level mathematics. It has sections entitled Return to L.N. Stout's…

The personal data of over 500 million Facebook users has been posted online in a low-level hacking forum. The data includes phone numbers, full names, location, email address, and biographical information. Security researchers warn that the data could be…

This post was written by Michael Nguyen, Machine Learning Research Engineer at AssemblyAI. AssemblyAI uses Comet to log, visualize, and understand their model development pipeline. Deep Learning has changed the game in speech recognition with the introduction…

Cryptography behind the top 100 cryptocurrencies This table is based on research at Nash for work expanding our MPC protocol to secure wallets on new blockchains. We took a snapshot of rankings by market cap in early February 2021. In summary, 74 coins use…