A | While scientists and science fiction authors alike have long dreamed of sending crewed missions to Mars, a new study suggests these plans may hit a snag – a big one.,The authors of a yet to be peer-reviewed study argue that the participants of such a mission to Mars would end up being exposed to radiation – namely, to “energetic charged particles from Galactic and Solar origin” – both while in transit and while on the planet itself, with the “thin spacecraft shield” and “rarefied Martian atmosphere” offering little in the way of protection.,The research team attempted to gauge the impact of a simulated 1,000-day mission to Mars on various organs of the human body, and concluded that astronauts may be exposed to radiation doses above one Sievert, which is over the safe limit set by most space agencies, New Scientist points out.,“We suggest mitigation strategies such as improved ways of shielding and dietary supplements, and make recommendations for the safety of astronauts in future crewed missions to Mars,” the team wrote in the abstract of their work available on the arXiv preprint server.,Ideas about how astronauts may be protected from radiation during a mission to Mars have already been proposed, such as the concept of a radiation shield comprised of a fungus found growing at the Chernobyl Nuclear Power Plant.,Last year, one architecture studio even unveiled a project for a self-sufficient and sustainable city that would be built on the red planet itself.。 IT之家 7 月 22 日消息，科技媒体 9to5Mac 昨日（7 月 21 日）发布博文，报道称通过挖掘 iOS 27 Beta 4 固件代码，发现苹果公司正面向 Apple Upgrade 租赁计划，针对客户拖欠付款时限制租赁设备。
B | IT之家今天援引彭博社报道，苹果公司最快有望下周在美国推出“Apple Upgrade”租赁计划，让客户以较低的月供购买硬件。 消息称该计划覆盖多数 iPhone、Mac、iPad 和 Apple Watch 机型，其中 iPhone 与 Apple Watch 租期为 24 个月，Mac 与 iPad 租期为 36 个月。 为了应对租期内异常情况，科技媒体 9to5Mac 挖掘 iOS 27 Beta 4 代码后，发现苹果已制定了完善的租赁设备管理机制。 首先，苹果在 iOS 27 系统中引入 App Managed Features 功能，Klarna 等授权的融资方或服务提供方可以有效监管租赁状态的 iPhone，持续查看当前合约状态等。 其次，对于处于异常状态的租赁合约机型，苹果系统服务可将 iPhone / Mac 等切换至 Restricted Mode（受限模式）。在该模式下，系统会阻止用户访问大多数应用，待用户完成付款或解决合约问题才会恢复。 基于 iOS 27 Beta 4 测试版内容，在进入受限模式后，用户依然可以继续使用部分应用，其白名单如下： Accessibility Reader 辅助功能阅读器 App Store 应用商店 Health 健康 Magnifier 放大镜 Phone 电话 Clock 时钟 Settings 设置 Wallet 钱包 Passwords 密码 The Restricted Mode interface itself 受限模式界面本身 此外代码还显示，白名单会加入信息 (Messages)、Home 应用以及某些药物或安全应用，在遇到突发事件等情况下会及时提醒用户。 该媒体同时指出，系统不会取消、暂停或修改与被封锁应用相关的 App Store 订阅，因此在应用访问受限期间，相关订阅仍可能继续扣费。 代码中还出现一种新的激活锁类型 Partner Finance Lock（合作伙伴融资锁），用于防止用户抹掉设备、转售设备，或将受限设备拆作零件。
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