baishuxu

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最新动态 6小时前

  1. 上周
    2019-02-08 21:17:05

    @FatFish 坦白来说这部小说关于量子力学特别是观察者问题的描述基本全都是毛病。而且很明显可以感觉到是那种大刘看了一些相关科普后产生的常见误解。(作为一个从小看物理科普最后学了物理的人,我基本产生过几乎完全相同的误解,而且我也见过这些观点在“科普受众”层面相当流行。)但是即使我后来了解更准确的研究之后,我仍然很喜欢这部小说——因为这部小说塑造了一个不依赖具体知识正确性的精彩剧情主线:探索实验一个未知现象,提出各种理论解释,最后再给出能解释之前种种奇怪现象的最优理论。整个过程非常有一种科研感,仿佛在看一段虚拟的科学史。

    和我之前搬运到坛子的《观察者》有异曲同工之妙啊……都是基于科普的错误理解,但是都在此基础上写出了优秀的科幻小说……

  2. 2019-02-05 20:07:54

    看完这部电影,我真的相信,中国科幻电影要扬帆起航了。

    看《流浪地球》之前,我不算很喜欢吴京,特别是因为他在几次采访里的一些言行,但是不得不承认,扔出伏特加、点燃MOSS核心、将「领航员」国际空间站撞入等离子体火柱的刘培强让我感动到了,不论是作为一名英雄还是作为一名父亲。

    除了他,我还为通信终端那一头的那位日本的UEG官员而感动,为前一刻还喊着「妈妈,我要回家!」,后一刻却用尽最后的力气把刘培强推向空间站主控室的马卡洛夫而感动,为救下韩子昂的刚子而感动……

    但最让我感动的,是无数来自不同国家、不同民族、不同文化,说着不同语言的救援队队员们,掉头前往苏拉威西3号发动机的那一刻。

    在全人类生死存亡的时刻,每一个普通人都可以成为英雄。

    一群普通人在危难关头的一点点无私,让影院座椅上的我涕泗横流。

    再说特效,不明白有什么黑点,除了最后刘启和韩朵朵坠落那段放大时有比较明显的CG感,全片特效水平都是顶级的。无论是封冻的北京和上海(央视大裤衩和东方明珠塔很引人注目啊),还是木星和地球之间巨大的气流之桥,从我一个普通观众的角度看,《流浪地球》做到了精巧与宏大兼顾,无数行星发动机细细的蓝色光柱竖立在地球表面,地球则拖着长长的尾巴——这份震撼,也让我热泪盈眶。

    还想说一点优点:生活气息。《流浪地球》真的营造了完美的代入感。一个几十年后的未来世界也居然可以充满触手可及的现实中的现代生活气息(在那个年代,《海草舞》大概是老古董级别的歌曲了吧23333韩子昂好像是1999年出生的,比我还小一岁)。真的很不可思议。

    缺点当然有。前半段(刘培强异常苏醒之前)的剧情真的有点乏善可陈,甚至看得我有点想睡觉。我觉得,前半段真的可以再引人入胜一点,要不然有点对不起影片后半段的高潮……

  3. 2019-02-05 20:07:12

    一楼剧透预警!
     /asnowwolf2-shock
     /asnowwolf2-shock
     /asnowwolf2-shock
     /asnowwolf2-shock
     /asnowwolf2-shock
    这不是演习!不想被剧透的请退出!
     /asnowwolf2-shock
     /asnowwolf2-shock
     /asnowwolf2-shock
     /asnowwolf2-shock
     /asnowwolf2-shock

  4. 2019-02-04 12:52:45
    baishuxu 更新于 论坛 2019 新年更新

    好棒! /asnowwolf2-shock

  5. 2周前
    2019-01-31 10:37:06

    @ConAntares 这个问题有个引申问题: 这个世界存在真随机么?

    记得之前见到过一个观点:随机与否取决于你对这个系统的了解(信息量)以及你的计算力……

    比如说抛硬币,假设是一枚绝对均匀的硬币,人手抛出去,假如你有办法获得这枚硬币抛出的全部初始条件,且有能力计算空气、重力等影响其运动状态的全部影响因素,那抛硬币的结果对你而言就是可以预测的,那就不是随机的;但是我没有这些初始条件,也没有足够的算力,我就没法预测结果,抛硬币对我来说就是一个随机事件,服从特定的统计分布……

  6. 2019-01-31 10:24:44
    baishuxu 发表了帖子 求助一个数列相关的证明……

    虽然我知道这个题肯定很弱智,但是我真的没想出来咋做……想过取mod然后看有没有循环,但是电脑枚举了一下并没有看出余数的规律……不过7的倍数大约是14%的比例,这倒是很容易理解……


    考虑数列$\left\{a_n\right\}$,$a_1=1$,$a_n=a_{n-1}+a_{\left[\frac{n}{2}\right]}\quad\left(n=2,3,\dots\right)$。求证:数列$\left\{a_n\right\}$中有无穷多项7的倍数。


    OEIS A033485

  7. 2019-01-29 17:01:55
    baishuxu 更新于 NASA每日天文一图

    2019 January 25

    -image-

    月面撞击坑
    Moon Struck

    Image Credit & Copyright :Petr Horálek

    Explanation: Craters produced by ancient impacts on the airless Moon have long been a familiar sight. But only since the 1990s have observers began to regularly record and study optical flashes on the lunar surface , likely explosions resulting from impacting meteoroids. Of course , the flashes are difficult to see against a bright, sunlit lunar surface. But during the January 21 total eclipse many imagers serendipitously captured a meteoroid impact flash against the dim red Moon. Found while examining images taken shortly before the total eclipse phase began, the flash is indicated in the inset above, near the Moon's darkened western limb . Estimates based on the flash duration recorded by the Moon Impact Detection and Analysis System (MIDAS ) telescopes in southern Spain indicate the impactor's mass was about 10 kilograms and created a crater between seven and ten meters in diameter.


    Tomorrow's picture: shadow-weekend

  8. 2019-01-28 13:20:31

    @雷天使 大刘的短篇就那么多为啥有那么多短篇集名字 /<

    《时间移民》收录了以下几篇小说:
    坍缩……………………001
    西洋……………………013
    镜子……………………029
    朝闻道…………………081
    命运……………………109
    山………………………119
    时间移民………………153
    思想者…………………171
    吞食者…………………189
    微纪元…………………223
    天使时代………………247
    梦之海…………………277
    微观尽头………………307
    欢乐颂…………………315


    《2018》收录了以下几篇小说:
    2018年…………………001
    赡养人类………………011
    诗云……………………055
    地火……………………087
    鲸歌……………………125
    白垩纪往事……………137
    人生……………………179
    超新星纪元(节选)…189
    圆圆的肥皂泡…………223
    纤维……………………245
    信使……………………255
    混沌蝴蝶………………263
    光荣与梦想……………287


    这么看大刘的作品其实还蛮多的……

  9. 3周前
    2019-01-24 15:54:22
    baishuxu 更新于 NASA每日天文一图

    2019 January 24

    -image-

    马特洪峰、月亮与流星
    Matterhorn, Moon, and Meteor

    Image Credit & Copyright : Stephane Vetter (Nuits sacrées ), TWAN

    Explanation: Fans of planet Earth probably recognize the Matterhorn in the foreground of this night skyscape. Famed in mountaineering history , the 4,478 meter Alpine mountain stands next to the totally eclipsed Moon. In spite of -22 degree C temperatures, the inspired scene was captured on the morning of January 21 from the mountains near Zermatt, Switzerland. Different exposures record the dim red light reflected by the Moon fully immersed in Earth's shadow . Seen directly above the famous Alpine peak, but about 600 light-years away, are the stars of the Praesepe or Beehive star cluster also known as Messier 44 . An added reward to the cold eclipse vigil, a bright and colorful meteor flashed below the temporarily dimmmed Moon, just tracing the Matterhorn's north-eastern climbing route along Hornli ridge.


    Tomorrow's picture: Moon Struck

  10. 2019-01-24 15:40:31
    baishuxu 更新于 NASA每日天文一图

    2019 January 23

    -image-

    奥地利境内阿尔卑斯山脉上的猎户座
    Orion over the Austrian Alps

    Image Credit & Copyright: Lukáš Veselý

    Explanation: Do you recognize this constellation? Through the icicles and past the mountains is Orion , one of the most identifiable star groupings on the sky and an icon familiar to humanity for over 30,000 years. Orion has looked pretty much the same during the past 50,000 years and should continue to look the same for many thousands of years into the future. Orion is quite prominent in the sky this time of year, a recurring sign of (modern) winter in Earth's northern hemisphere and summer in the south. Pictured, Orion was captured recently above the Austria n Alps in a composite of seven images taken by the same camera in the same location during the same night. Below and slightly to the right of Orion's three-star belt is the Orion Nebula , while the four bright stars surrounding the belt are, clockwise from the upper left, Betelgeuse , Bellatrix , Rigel , and Saiph .


    New: Instagram page features cool images recently submitted to APOD
    Tomorrow's picture: the cold eclipse

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