忧郁奶蛙

[トランジスタ技術【役に立つエレクトロニクスの総合誌】 @toragiCQ]

🛰️衛星の電波を「高利得・円偏波」で狙い撃ち！

トランジスタ技術11月号「試せる！宇宙技術」では，435MHz帯の高利得・円偏波ヘリカル・アンテナを自作します．

衛星通信では，衛星の姿勢や位置によって電波の偏波方向が変化します．そこで，円偏波と高利得を両立するヘリカル・アンテナに挑戦．

🔧 435MHz帯に合わせて設計
📐 巻き数やピッチを計算
📡 SO-50などの衛星通信を受信
🛰️ CubeSatのテレメトリにも挑戦

「衛星から届く弱い電波を，どうやって効率よく捕まえるか？」
アンテナの理論を計算し，実際に作って，測って，受信するところまで試します．

#トランジスタ技術 #トラ技 #宇宙技術 #衛星通信 #アンテナ #ヘリカルアンテナ #CubeSat #SO50

[Puma @pumamethod]

ejaculation depletes glutathione. glutathione is the single most important antioxidant your body produces. it is called the "master antioxidant" because every other antioxidant (vitamin C, vitamin E, alpha lipoic acid) depends on glutathione to recycle them back into their active form. when glutathione is depleted, the entire antioxidant defense system degrades. you're not just losing one antioxidant when you ejaculate. you're losing the one that all the others depend on.

the mechanism: seminal fluid contains significant concentrations of glutathione because sperm cells require antioxidant protection to survive the oxidative environment of the female reproductive tract. the body loads glutathione into seminal fluid the same way it loads zinc: at concentrations that prioritize reproductive success over systemic defense. ejaculation removes that glutathione from the body. the replenishment requires the amino acids cysteine, glycine, and glutamate plus ATP energy. chronic ejaculation creates a chronic glutathione deficit.

this is why men on nofap report improved skin, reduced inflammation, faster recovery from exercise, and "feeling healthier" at a level they struggle to articulate. the improvement is systemic because glutathione is systemic. every cell in the body uses glutathione. when the chronic drain stops, the master antioxidant normalizes. every downstream antioxidant function improves because the molecule that recycles them all is no longer being depleted faster than it's produced.

the immune system depends on glutathione for T cell activation and function. the liver depends on glutathione for phase 2 detoxification. the mitochondria depend on glutathione for protection against the reactive oxygen species they produce during energy production. the brain depends on glutathione for protection against neuroinflammation. every system. one antioxidant.

the supplement industry sells glutathione supplements for $30 to $60 per month (liposomal form for absorption). the supplements are attempting to refill a tank that chronic ejaculation is actively draining. the math doesn't work. you cannot out supplement a behavior that depletes faster than the supplement refills. the cheapest and most effective glutathione optimization strategy is free: stop draining the tank.

the man on day 30 of nofap has glutathione levels that the man supplementing glutathione while ejaculating daily cannot achieve. the retained man's body kept what it produced. the depleted man's body is producing and losing simultaneously. one is filling a bucket. the other is filling a bucket with a hole in it. the $40 per month glutathione supplement is water through the hole. retention is the plug.

[サイバー環状線 @CyberKanjousen]

以防你不知道：
曼 从中间劈开就是 MAN！：

[草帽王 @caomaowang1]

苏州的朋友有福了，看看你用的VPN是什么协议的，命中的话可以会自动上报请喝茶了😱

[Joker Jon's @NorenNamert]

Илон Маск предлагает не охлаждать чипы для космоса, а наоборот — пусть работают горячими.

Вот в чём настоящий парадокс космических дата-центров.

Все думают: «В космосе же −270 °C, чипы будут охлаждаться сами». На деле всё наоборот. В вакууме нет ни воздуха, ни воды, которые могли бы уносить тепло. Вакуум работает как огромный термос: тепло, которое выработал чип, остаётся внутри. Единственный способ от него избавиться — излучать его в виде инфракрасного света с больших радиаторных панелей.

И тут начинается жёсткая физика. Чем холоднее радиатор, тем слабее он излучает. По закону Стефана–Больцмана мощность излучения растёт пропорционально **четвёртой степени** абсолютной температуры. Если поднять рабочую температуру чипа всего на 20 % в кельвинах, радиаторы начинают излучать в два раза больше тепла. Значит, их можно сделать в два раза меньше и легче.

Именно об этом говорит Маск в видео:
«Если увеличить рабочую температуру на 20 % в кельвинах, массу радиаторов можно сократить вдвое. Поэтому в космосе выгодно работать на более высокой температуре».

На Земле мы тратим миллиарды, чтобы держать чипы холодными. В космосе выгоднее спроектировать чипы так, чтобы они спокойно работали при 100–120 °C. Тогда радиаторы становятся существенно легче, а стоимость запуска резко падает. Плюс нейросети довольно устойчивы к случайным битовым ошибкам от радиации — для огромной модели несколько перевёрнутых битов почти ничего не значат.

Получается, что главная проблема космического ИИ — не энергия (солнце в космосе бесплатное и постоянное), а именно теплоотвод. И Маск предлагает решать его не охлаждением, а температурой.

Выглядит почти контринтуитивно, но физика на его стороне.

[Michael W. @Michaelskywal]

Should a USB-C connector's shell go straight to ground, or through an RC (1 MΩ ‖ 4.7 nF)? Open boards are split.

I hit both with a simulated 8 kV zap. Either way, 30 A lands in your ground. The cap is just left holding 249 V.

Answer: straight, unless the box is earthed. 🧵

[kepano @kepano]

Pain is information

As a child, you touched something hot, and it burned you. That pain gave you a piece of information: be careful touching hot things.

When you sign up to run a marathon, you are signing up for pain. But whether or not you keep running is up to you. In Haruki Murakami’s words “pain is inevitable but suffering is optional”. You can choose pain without choosing suffering.

Pain is information, and information is painful. Rewiring your brain is not a frictionless process. Some knowledge can only be discovered the hard way.

The sooner you can convert pain into knowledge, the sooner you can experience the next useful pain. Don’t put yourself through the same pain too many times. To access new information you must experience new pains.

They say “knowledge is power”. If pain is information, then pain can be converted to power. To do so, you must learn to control your suffering, accept that scars are beautiful.

If you felt pain, ask what information it gave you. If that information was useful, seek the next pain. You are learning.

[lifcc @mylifcc]

当国内技术圈还在争论“Rust 到底适不适合写大型客户端和底层系统”时，vivo 其实从 2019 年就开始干一件极其激进的事：用 Rust 从零全栈重写一套消费级操作系统——蓝河 OS（BlueOS）。
注意，不是跑在模拟器里的实验室玩具，而是已经量产上机、跑在最低只有 32MB 内存穿戴设备上的生产级系统。
最近蓝河 OS 架构负责人贺程做了一次硬核分享《Rust × AI：vivo 蓝河操作系统的架构创新与实践》。通篇没有公关吹水，全是几百万行 Rust 代码落地过程中的“拆雷实录”。
我把里面最有价值的 5 块工程硬骨头和他们至今没解决的痛点完整梳理了出来，做系统级研发和客户端架构的朋友可以直接当避坑指南看 👇

[こたっく @Kotakku_07]

コインサイズのLiDARモジュール基板来た！

[忧郁奶蛙 @_JOEYCH]

@linguanus 歪比巴卜

[Linguan @linguanus]

奶蛙本体现世了！

🤓👆

[METEOR INCOMING | EMJI @Emji_kazer]

Les chinois sur Twitter ils ont l’air de gens sympas qui aiment beaucoup trop le sexe

[Fingerling @lovelylogicss]

Pi Pocket 0.14 is out!

This one's a big one. The goal was to make Pocket a clean base anyone can build on, so most new stuff can just be extensions and themes now instead of changes to Pocket itself. Fork maintainers rejoice, the extension API is stable from here on, so most of what you forked for can just be an extension now.

Extensions can add pages, buttons, routes and slash commands right into the app, and Pi can build them for you. In the video I had it build itself a live team board, straight from the docs.

Also new: Agent Teams, an extension gallery (pinned, hashed, and off until you turn it on), themes that can change the whole layout, and a refreshed look.

Pocket is built on Pi Durable, so a huge thanks to @badlogicgames and @pidotdev for Pi, Pi Durable, and the foundation that let us build a cool thing.

And this release wouldn't be what it is without the community. 13 people, 12 PRs and 15 issues went into 0.14. Thank you all!

https://t.co/VV5AQAQCZW

[Mathelirium @mathelirium]

I hated the way pre-calculus courses taught the epsilon-delta definition of a limit.

So, I went to the library looking for something better and I came across Selected Papers on Calculus by Tom Apostol. Not only did I find a simple alternative, I also got a chance to impress my lecturer and peers with something they never saw before. It's one of those feelings that motivates love and pursuit of mathematical knowledge among young freshmen.

@nntaleb might call these mathematical acrobatics, but one of the things this AI era will do is deny upcoming mathematicians the thrill of discovery.

[老鬼 @laogui]

基于 Pi Coding Agent 的各类套壳 GUI 已经不少了，JetBrains 也开源了一个 ThinkRail，毕竟出自 IDE 老大哥，工程水准不会差。

这项目几个月前就有了，但没见官方推广，也很少有人提，GitHub Star 才 500 多。我之前纳闷 JetBrains 既然有了官方主推的新 ADE 工具 Air，为什么还要单独做一个专为 Pi 打造的 ThinkRail？

上手体验后发现两者定位不同：Air 是企业级重装航母，而 ThinkRail 是极致轻量的极客工具。它基于 Electrobun（Bun 跨平台桌面方案）开发，内存占用极低。

功能也和市面上的 ADE 差不多：
🔹 Git Worktree 隔离：每个 Workspace 都是独立的 worktree 分支与目录，适合多 Agent 并行开发。
🔹 规范驱动（SDD）​：这个稍微有点特色，让 Agent 先读懂架构设计再施工，彻底防止代码写跑偏。
🔹 简单的 IDE 功能：集成 Monaco 编辑器、实时 Git Diff 审查和独立终端。

全平台均可直接下载体验：
官网：https://t.co/25wHyBk9tL
项目地址：https://t.co/MT8H9kuHGy

[Mathematica @mathemetica]

A single number is already a tensor.

Add one index and it becomes a vector. Add a second and you have a matrix. Add a third and the array becomes a cube of numbers. Each step simply increases the number of indices needed to pick out one entry.

Rank is that count: 0 for a scalar, 1 for a vector, 2 for a matrix, 3 or more for a full tensor. The same rules of addition and multiplication apply at every level.

Tensors are not a new kind of object. They are the general case that includes everything else.

[Sipeed @SipeedLab]

Hands-on with our tiny acoustic camera #SoundRay64: watch sound appear on screen — yes, even ultrasound!

[Hayata Yamamoto / Trope @Mjm_12f]

GitHubを探索していたら見つけたオープンソースSMUのプロジェクト

全体的にシンプルな実装ながら、パワーアンプ・アナログフロントエンド・DAC・デジタル回路など、回路設計でよく使うパターンを一通りカバーしていて、眺めているだけでめっちゃ勉強になるリポジトリだったからシェア

[Elon Musk @elonmusk]

Going forward, all advertising on 𝕏 will be subject to a reasonable esthetic standard.

Advertisers who post ads that are ugly, shrill, strident or overstate claims about their product will be barred from advertising.

[忧郁奶蛙 @_JOEYCH]

@Sweet_xst 好一个全身心考研