VOA Special English Development Report --- Setup Internet connection in Africa.

美国年轻工程师团队使用太阳能供电的卫星设备为肯尼亚农村地区提供互联网接入。该项目克服了电力供应不足的问题,并为当地社区带来了教育、医疗等信息资源。


This is the VOA special English Development Report.
Some young engineers from the United states,  have brought the internet to several areas of rural Kenya.
Their idea was to connect the communities to the web by satellite.
but there was a problem, the areas are not even connected to Kenya's electrical power supply.
The answer: Solar pannels. Energy from the sun powers the satellite dish and the computers that link
the areas with the world outside. Kelly Moran, Joan Ervin and Tricia Donajkowski spent ten days in Kenya in November.
The women recently earned master's degrees in space systems engineering from the university of Michigan.
Another Engineer, Drew Hechathorn, did not go to Afica but work on parts of the project.
Kelly Moran says there was excitement when the team would arrive to connect communities to the internet,
people would sometime run along side the car carring the engineers to welcome them.
And Local residents would offer to help the team build the internet station. People now have access to
educational, medical and all kinds of other infomation. farmers for example, can  easy find weather, crop and price
information on line.
the project began back at the college of engineering in Ann Arbor, Michigan, in two thousand seven, that was when
twenty-five students in the class taught by Thomas Zurbuchen first talked about the idea.
the goal was to test whether the internet station could be setup, how much it casts and how long they could operate.
but the engineers also had to consider other things, like social needs. Students from the public health and
business school offered advice. The young engineers also had to design the equipment to survive the heat in Africa.
Professor Zurbuchen praises his former students for "making something work in a different climate far away from home".
Google paid for the final design of the equipment. the company is also supporting the cost of the satellite band width that needed
for the internet.
Google has invested in a new company that want to put up a system of satellites over Africa.
 the availability of more satellites would reduce the cost.
just 5 percent of Africans have the internet connections, The international Telecommunication Union says
One-third of Kenyans have mobile phones. But Mobile phones may or may not work well with the internet.
And that's the VOA special English Development Report.

 

内容概要:本文详细介绍了“秒杀商城”微服务架构的设计与实战全过程,涵盖系统从需求分析、服务拆分、技术选型到核心功能开发、分布式事务处理、容器化部署及监控链路追踪的完整流程。重点解决了高并发场景下的超卖问题,采用Redis预减库存、消息队列削峰、数据库乐观锁等手段保障数据一致性,并通过Nacos实现服务注册发现与配置管理,利用Seata处理跨服务分布式事务,结合RabbitMQ实现异步下单,提升系统吞吐能力。同时,项目支持Docker Compose快速部署和Kubernetes生产级编排,集成Sleuth+Zipkin链路追踪与Prometheus+Grafana监控体系,构建可观测性强的微服务系统。; 适合人群:具备Java基础和Spring Boot开发经验,熟悉微服务基本概念的中高级研发人员,尤其是希望深入理解高并发系统设计、分布式事务、服务治理等核心技术的开发者;适合工作2-5年、有志于转型微服务或提升架构能力的工程师; 使用场景及目标:①学习如何基于Spring Cloud Alibaba构建完整的微服务项目;②掌握秒杀场景下高并发、超卖控制、异步化、削峰填谷等关键技术方案;③实践分布式事务(Seata)、服务熔断降级、链路追踪、统一配置中心等企业级中间件的应用;④完成从本地开发到容器化部署的全流程落地; 阅读建议:建议按照文档提供的七个阶段循序渐进地动手实践,重点关注秒杀流程设计、服务间通信机制、分布式事务实现和系统性能优化部分,结合代码调试与监控工具深入理解各组件协作原理,真正掌握高并发微服务系统的构建能力。
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