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I Fixed Sam Rogers’s Gravity 2 Problem… ⌘ Read more
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Public Beta 2 of iOS 18, iPadOS 18, macOS Sequoia Available
Users who are engaged in the public beta testing programs for upcoming Apple system software will find updates available for their devices, including iOS 18 public beta 2, iPadOS 18 public beta 2, macOS Sequoia public beta 2, tvOS 18 public beta 2, and watchOS 11 public beta 2. The second public betas match the … Read More ⌘ Read more
Highlights from Git 2.46
Git 2.46 is here with new features like pseudo-merge bitmaps, more capable credential helpers, and a new git config command. Check out our coverage on some of the highlights here.
The post Highlights from Git 2.46 appeared first on The GitHub Blog. ⌘ Read more
2024 巴黎奥运会开幕式主火炬采用热气球点火腾空方案，有什么寓意？
#巴黎奥运会#巴黎奥运今年主火炬是个热气球，很多博主科普说，其灵感来源于蒙戈尔菲耶兄弟的热气球。
正好更新这段科学史，讲了1783-1784年间，人类首次飞上天空，英法两国紧张兮兮地开展飞天气球军备竞赛。
最终发现，这竞赛也没啥大用。
蒙戈尔菲耶兄弟，法国人，造出了热气球，也是人类首个热气球。
哥哥约瑟夫，弟弟艾蒂安，家里人口多，这一代16个孩子。
他俩出身于造纸工厂，能造出来热气球，2个原因：
1.经济的发展：
他们居住的小镇阿诺泰，当时是法国造纸产业核心，制造业要求他们学习化学。
兄弟俩有事儿没事儿就琢磨化学发明创造，当时一流化学家做过的实验，他俩都做过。
2.科技的进步：
当时拉瓦锡正在法国搞现代化学，英国对 … ⌘ Read more
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On my blog: Free Culture Book Club — Aether Age Codex - Helios, part 2 https://john.colagioia.net/blog/2024/07/27/helios-2.html #freeculture #bookclub
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Bought a motorcycle this summer, I did not want two cars, and Marlyn would like to have the car more when I'm at work. So I bought a new cheap motorcycle, KTM Adventure 390.
It's been 10 years since I last had a motorcycle (back then I had a KTM 990cc).
Here I am with my daughter on the new bike :)
My kids love to go for rides, so does Marlyn as well, so it's a lot of fun for all of us.
Media
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@bender@twtxt.net It cost what you mentioned here too, but they had a special discount, and the shop gave 20% discount for all the gear we needed (since I bought the bike + gear for two persons), so all in all I got a really good deal on it. Also interest rate is locked for 3 years (low rate) so that was also a good deal.
I just took the longest time I could on the loan, to have a low price each month, and then i just pay extra whenever I can to get it payed down faster.
Luckily the Marlyn, my son, and my daughter all fit the same gear, so the 3 of them share that, that saved a lot of money too :)
When i met Marlyn (before we had kids) I asked here to go on her first trip with me (I had a bike before I met her back then), and we went on a 2 week ride from Norway to Italy and back (venice) through the alps and all that. Was super fun, and I think it’s pretty cool of her to say yes to a 2 week trip as passenger :)
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Radxa X4 with Intel Alder Lake-N Processor and 2.5GbE LAN Now Available for Preorder
Radxa X4 with Intel Alder Lake-N Processor and 2.5GbE LAN Now Available for Preorder ⌘ Read more
Anyway, I’m gonna have to go to bed… We’ll continue this on the weekend. Still trying to hunt down some kind of suspected mult-GB avatar using @stigatle@yarn.stigatle.no ’s pod’s cache:
$ (echo "URL Bytes"; sort -n -k 2 -r < avatars.txt | head) | column -t
URL Bytes
https://birkbak.neocities.org/avatar.jpg 667640
https://darch.neocities.org/avatar.png 652960
http://darch.dk/avatar.png 603210
https://social.naln1.ca/media/0c4f65a4be32ff3caf54efb60166a8c965cc6ac7c30a0efd1e51c307b087f47b.png 327947
...
But so far nothing much… Still running the search…
3 Ways CARIAD Configures Docker Business for Security and Compliance
Find out how CARIAD configures Docker for security and compliance using Docker Single Sign-On, Image Access Management, and Windows Subsystem for Linux 2. ⌘ Read more
Amazon Introduces Big Savings on Popular Accessories From Anker, Eufy, and Jackery
Amazon today has a large collection of discounts from Anker, [Eufy](https://buy.geni.us/Proxy.ashx?TSID=3088&GR_URL=https%3A%2F%2Fwww.amazon.com%2Fdp%2 … ⌘ Read more
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Public Beta 2 of iOS 18, iPadOS 18, macOS Sequoia Available
Users who are engaged in the public beta testing programs for upcoming Apple system software will find updates available for their devices, including iOS 18 public beta 2, iPadOS 18 public beta 2, macOS Sequoia public beta 2, tvOS 18 public beta 2, and watchOS 11 public beta 2. The second public betas match the … Read More ⌘ Read more
We went to a new dog park today (1.5hr drive), booked the biggest of 3 parks for 2 hours, we had a really nice time there :) us and kids + dog had a blast :)
Empowering Developers with Docker: Simplifying Compliance and Enhancing Security for SOC 2, ISO 27001, FedRAMP, and More
With a Docker Business subscription, Docker customers have access to granular controls and a full product suite to help them maintain compliance and improve security. ⌘ Read more
Go 語言定時任務 time-Sleep 和 time-Tick 的優劣對比分析
golang 寫循環執行的定時任務，常見的有以下三種實現方式 1、time.Sleep 方法：for { time.Sleep(time.Second) fmt.Println(“我在定時執行任務”)}2、time.Tick 函數：t1:=time.Tick(3time.Second)for { select { case <-t1: fmt.Println(“t1定時 ⌘ Read more
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MacOS Sequoia 15 Beta 4 Available to Download
Apple has released the fourth beta version of MacOS Sequoia 15 to those who are actively running macOS Seqouia developer beta in the testing program. A matching build for public beta testers typically arrives soon after, which would be versioned macOS Sequoia public beta 2. MacOS Sequoia 15 features some intriguing new features for the … Read More ⌘ Read more
Radxa Teases Upgraded ROCK 5B+ SBC with LPDDR5 RAM and Onboard Wi-Fi 6
Radxa Teases Upgraded ROCK 5B+ SBC with LPDDR5 RAM and Onboard Wi-Fi 6
Radxa has introduced an upgraded version of their Radxa ROCK 5B, originally launched in 2022. This latest iteration of the single-board computer retains the Rockchip RK3588 SoC from its predecessors, now enhanced with significant upgrades including LPDDR5 RAM, dual M.2 M Key connectors, onboard Wi-Fi 6, among other features. ⌘ Read more
Golang - range 迭代器揭祕
簡介我們正在使用 Go 語言編寫 Dolt[1] ，這是世界上第一個版本控制的 SQL 數據庫。像大多數大型 Go 代碼庫一樣，我們有很多需要迭代的集合類型。 Go 1.23 的新特性 [2] 中，你現在可以使用 range 關鍵字來迭代自定義集合類型。這是如何工作的? 這是個好主意嗎? 讓我們深入探討一下。如果你想運行本教程中的任何代碼，你需要 安裝 Go 1.23 發佈候選版 [3] ，或者在 ⌘ Read more
Golang 面試題：原子操作和鎖
1、問題描述原子操作和鎖的區別是什麼？2、問題解答原子操作和鎖是併發編程中常用的兩種同步機制，它們的區別如下：1、作用範圍：原子操作（Atomic Operations）：原子操作是一種基本的操作，可以在單個指令級別上執行，保證操作的原子性。原子操作通常用於對共享變量進行讀取、寫入或修改等操作，以確保操作的完整性。 鎖（Lock）：鎖是一種更高級別的同步機制，用於保護臨界區（Critical ⌘ Read more
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GNOME Ousts Elected Board Member in Secret, Tells Nobody for 2 Months
Secret meetings. No transparency. Total chaos at the GNOME Foundation as they remove Sonny Piers, one of their Board Members, without telling anyone. This all happens right as the GNOME Executive Director quits, GNOME announces dire financial circumstances, and a disastrous “5 year plan” focusing on DEI. ⌘ Read more
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Raspberry-like SBC Powered by RK3528A SoC and PCIe 2.0 Support
Raspberry-like SBC Powered by RK3528A SoC and PCIe 2.0 Support
The Radxa ROCK 2A is a credit card-sized single-board computer with a form factor similar to the Raspberry Pi. Key features include a Gigabit Ethernet LAN port, Wi-Fi 6 support, and an FPC connector for further expansion. ⌘ Read more
[47°09′55″S, 126°43′24″W] Raw reading: 0x669B98B2, offset +/-2
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OrangePi 5 Max SBC with M.2 Key Slot and 2.5GbE LAN Port
Orange Pi recently showcased their latest single-board computer, the OrangePi 5 Max, on their Twitter account. This device is powered by the octa-core Rockchip RK3588 and includes key interfaces such as a 2.5GbE LAN port and an M.2 M-Key slot for expansion. The OrangePi 5 Max features the RK3588 SoC, an 8nm LP process chip […] ⌘ Read more
(Updated) Orange Pi Teases Upgraded Orange Pi 5 Pro SBC with LPDDR5 and M.2 Key Slot
Orange Pi has recently provided additional specifications about their latest Orange Pi 5 Pro Single Board Computer built around the new-gen Rockchip RK3588S System-on-Chip. Key features of this board are its GbE port with PoE+ support, M.2 Key slot for expansion and Wi-Fi5/BT5.0 connectivity. Similarly as the Radxa ROCK 5C Lite SBC and the Toybrick […] ⌘ Read more
構建並運行 eBPF 應用 - Part 2
在上一篇文章中，我們用 C 語言創建了一個 eBPF 程序，以瞭解某個進程使用 CPU 的時間。這些數據隨後被存儲在 BPF HashMap 中。但這是一個不斷更新的短期存儲位置，數據的壽命很短…… 我們該如何利用這些數據呢？這就是用戶空間程序的用武之地。用戶空間程序不在內核空間運行，但可以附加到 eBPF 程序並訪問 BPF HashMap。現在讓我們來看看如何用 Golang 編寫用戶 ⌘ Read more
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Gajim: Gajim 1.9.2
Gajim 1.9.2 brings an important OMEMO encryption fix, native notifications on Windows, usability improvements, and many bugfixes. Thank you for all your contributions!
For some versions now, Windows offers a native notification system, including a notification center for unread notifications, notification settings, etc. If you are running Windows 10 (specifically build 10240) or later versions, Gajim will now use these native notifications.
Thanks to our contributor [@nico … ⌘ Read more
Erlang Solutions: Meet the team: Nico Gerpe
Welcome to our first-ever “Meet the Team” series! In this first edition, we’ll be shining the spotlight on Nico Gerpe, the Business Unit Lead for the Americas team at Erlang Solutions.
Nico discusses his role at Erlang Solutions, his latest explorations in the IoT and machine learning space and most importantly- fun Argentinian summer traditions!
About N … ⌘ Read moreGolang 實現坦克世界
Golang 實現坦克世界項目地址: https://github.com/gofish2020/tankgame 歡迎 Fork && Star遊戲效果—-本項目基於遊戲引擎 Ebitengine 開發，這裏有很多的實例 https://ebiten-zh.vercel.app/examples/ 便於邊學邊用程序下載到本地，直接 go run main.go即可看效果。開發使用的go1.2 ⌘ Read more
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The 9 Best Apple Deals Under $100 for Prime Day
As Prime Day continues today, we’re highlighting all of the best Apple deals you can get for under $100 on Amazon. This includes AirPods, Apple Pencil 2, AirTags, iPhone cases, USB-C chargers, and more.
… ⌘ Read more
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MYIR’s New Affordable RK3568 Dev Board with M.2 SSD Slot & Dual GbE
MYIR has launched the MYC-LR3568, a cost-effective System-on-Module available for commercial and industrial applications, alongside a development board that provides access to dual Gigabit Ethernet ports, multiple display ports, and wireless connectivity. The MYC-LR3568 SoM features a compact 381-pin LGA package design, with dimensions of 43mm x 45mm. It integrates core components such as the […] ⌘ Read more
[47°09′09″S, 126°43′51″W] Raw reading: 0x66950131, offset +/-2
历代的《三国志》里有哪些细思恐极的细节？
看了一圈没有说三国志12的，三国志12人气这么低吗？补充几句。
1. 高览在本作是单挑王，战法一开无人能制，不愧是“河北四庭柱”之一。如此看来，设计组应该研究过张国良的《评话三国》 。
(高览武力82，战法降敌方30点武力，也就是说武力112才能打平，可吕布+方天画戟才108，可以想象武力七八十的碰到高览该有多绝望。）
2. 作为吉祥物，刘禅能力值全班倒数第一，看起来这辈子就基本告别战场了。但问题是，他的战法是“全攻城强化”。本作有个设定：系统非常青睐拥有攻城类战法的武将，不但让他们出征，而且是第一顺位。由此，吉祥物摇身一变成为战争狂魔，动辄带着四五千士兵敲人城门。这一点与文明系列的“核平使者甘地”有异曲同工之处，不知道是不是光荣有意为之。说好的“乐不思 … ⌘ Read more
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U2500 HAT Adds M.2 NVMe Support & Dual 2.5G Ethernet for Raspberry Pi 5
U2500 HAT Adds M.2 NVMe Support & Dual 2.5G Ethernet for Raspberry Pi 5
The U2500 M.2 NVMe & dual 2.5G Ethernet for Raspberry Pi 5, recently featured by the distributor 52Pi, is a versatile expansion module designed to enhance the capabilities of the Raspberry Pi 5. This HAT board integrates high-speed storage and network features, making it suitable for various advanced applications. ⌘ Read more
On my blog: Sleep, Addendum https://john.colagioia.net/blog/2024/07/14/sleep-2.html #sleep #advice #rant
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MacRumors Giveaway: Win an Apple Watch Ultra 2 and Charger From Lululook
For this week’s giveaway, we’ve teamed up with Lululook to offer MacRumors readers a chance to win an Apple Watch Ultra 2 and a Lululook 3-in-1 Charger to go along with it.
 is a messaging standard Apple is adopting in iOS 18 that will revolutionize the messaging experience between iPhone and Android devices. Think of it as SMS 2.0 – a major upgrade to the traditional text messaging we’ve been using for years.
Apple’s decision to embrace RCS came [last year](https://www.macrumors.com … ⌘ Read more
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HatDrive! Nano: Affordable €9.00 M.2 HAT for Raspberry Pi 5
The Pineboards HatDrive! Nano is a compact 2230/2242 M-Key M.2 HAT for the Raspberry Pi, measuring 55 x 34mm. It offers an affordable upgrade from a microSD card to M.2 storage, supporting NVMe SSDs, AI accelerators, and other M-Key devices. It is compatible with the official Raspberry Pi case lid and the Active Cooler. Unlike […] ⌘ Read more
Apple Preparing Minor iOS 17.5.2 Update for iPhone
Apple is preparing to release a minor iOS 17.5.2 update for the iPhone, according to a post shared today by an anonymous leaker on X, formerly known as Twitter. The leaker has a private account, so we are not identifying it or linking to it, but they have proven to be a consistently accurate source for upcoming iOS updates.
Nothing is known about iOS 17.5.2, … ⌘ Read more
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Turing Pi 2.5 4-Node Mini-ITX Cluster Board Receives Hardware Upgrades
The Turing Pi 2.5 is an updated version of the Turing Pi 2.0, a 4-node mini ITX cluster board compatible with Raspberry Pi CM4 modules and Nvidia Jetson modules. This compact device is designed for applications such as building Homelabs, self-hosting, and machine learning tasks, as it is capable of continuous 24/7 operation. The Turing […] ⌘ Read more
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On my blog: Real Life in Star Trek, Unification Part 2 https://john.colagioia.net/blog/2024/07/04/unification-part-2.html #scifi #startrek #closereading
Golang 編寫範型集合，官方文檔未提及的訣竅
引言–Go 的泛型功能在 Go 1.18 版本中發佈, 至今已有兩年多了。我們正在使用 Go 開發 Dolt[1] , 這是世界上第一個支持版本控制的 SQL 數據庫。儘管我們有數十萬行 Go 代碼, 但我們並沒有大量使用泛型。我們在一些地方使用泛型 來加速代碼中的高流量部分 [2] , 但總的來說, 除了 slices[3] 和 maps[4] 包中的一些有用的庫方法外, 我們還沒有找到使用泛 ⌘ Read more
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Ignite Realtime Blog: Openfire 4.8.2 Release
Openfire 4.8.2 has landed!
This release addresses a number of issues in the real time collaboration server created by the Ignite Realtime Community that aim to reduce bugs and increase stability and performance.
Interested in getting started? You can [download installers of Openfire here](https://igniterealtime.org/downloads/#op … ⌘ Read more
2 of the Best Hex Editors for Mac: ImHex & Hex Fiend
Hex editors are software tools that are able to view and edit hex data and raw binary data of files, and can be frequently used by programmers, developers, and reverse engineers, to inspect, debug, and analyze files and software. Some advanced users even rely on hex editors for data recovery and digital forensics, or to … Read More ⌘ Read more
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which 2 songs are you adding to the Voyager Golden Record? 🤔 ⌘ Read more
Apple Releases Second macOS Sonoma 14.6 Public Beta
Apple today seeded the second beta of an upcoming macOS 14.6 update to public beta testers, allowing non-developers to test the software ahead of its launch. Today’s public beta comes two weeks after Apple released the first public beta.
Beta testers can opt-in through … ⌘ Read more
Apple Releases Second Public Beta of iOS 17.6
Apple today seeded the second betas of upcoming iOS 17.6 and iPadOS 17.6 updates to public beta testers, with the betas coming two weeks after the initial iOS and iPadOS 17.6 developer betas.
Public beta testers can get the beta by opening up the Settings app, going to the Software … ⌘ Read more
《艾尔登法环》里谁杀了主角的女巫？
先说结论，不知道，但是有几个嫌疑人。
- 接肢贵族后裔
- 白面具梵雷
- 葛瑞克
- 梅林娜
分析每个嫌疑人之前，先说一下，其实整个游戏里一共出现了五个女巫。首先是开头侯王厅躺着的无名女巫，让人叫老婆的那个，不过她是不是主角的女巫，并不好说，可以自由心证。
第二个是镇静教堂里死去的无名女巫，会被维克入侵的那个地方，大约是维克的女巫，从她身上能拿指头女巫套的。
第三个是塞尔维斯的傀儡，瑟萝莉娜，会在拉达恩祭典上被金符召唤，祭典广场上对话会给你一个鞠躬动作，在塞尔维斯的 … ⌘ Read more
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Beta 2 of iOS 17.6, iPadOS 17.6, & macOS Sonoma 14.6 Released for Testing
The second beta versions of iOS 17.6, macOS Sonoma 14.6, and iPadOS 17.6 are available to users who are enrolled in beta testing programs for current generation system software of Apple devices. While many beta testers have likely proceeded ahead with installing the iOS 18 beta, iPadOS 18 beta, and MacOS Sequoia beta, undoubtedly there … [Read More](https://osxdaily.com/2024/07/01/beta- … ⌘ Read more
Apple Seeds Second Betas of iOS 17.6 and iPadOS 17.6 to Developers
Apple today seeded the second betas of upcoming iOS 17.6 and iPadOS 17.6 updates to developers for testing purposes, with the second betas coming two weeks after the first iOS and iPadOS 17.6 betas.
Registered developers are able to opt into the betas by openi … ⌘ Read more
Apple Seeds Second Beta of watchOS 10.6 to Developers
Apple today seeded the second beta of an upcoming watchOS 10.6 update to developers for testing purposes, with the second beta coming two weeks after the release of the first beta.
To install the watchOS 10.6 update, developers need to open the Apple Watch ap … ⌘ Read more
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(Updated) T-Display S3 Pro adds a 2.33” screen and phone OTG support
LILYGO has introduced the T-Display S3 Pro, a solution designed for portable applications that require multi-touch display support. This compact device not only boasts a 400mA battery but also integrates a range of sensors and offers optional IMU support. Similarly as the standard T-Display-S3 released some time ago, this upgraded version accommodates the following ESP32-S3 […] ⌘ Read more
Swift on RISC-V: Launch of New Toolchain for RISC-V Hardware
The Swift programming community has taken a significant step towards embracing open architecture with the announcement of the first Swift toolchain release for RISC-V hardware. This new project, Swift on RISC-V, introduces a complete toolchain that can be installed and used on RISC-V platforms, including the VisionFive 2 single-board computer. As RISC-V’s open-source instruction set […] ⌘ Read more
[47°09′35″S, 126°43′14″W] Raw reading: 0x66810271, offset +/-2
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Top Stories: iOS 18 Beta 2, Apple Vision Pro International Launch, New Beats Speaker, and More
Apple is moving right along on iOS 18, macOS Sequoia, and other new operating systems that were unveiled at WWDC earlier this month, releasing the second developer betas of the updates this week with a number of new changes and additions. Public betas will follow sometime next month ahead of a full public release in the fall.
Othe … ⌘ Read more
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(Updated) HiFive Unmatched SBC showcases new FU740 RISC-V SoC
SiFive has opened $665 pre-orders on a “HiFive Unmatched” Mini-ITX dev board that can power a PC. The SBC runs Linux on a penta-core, 64-bit SiFive FU740 SoC and offers 2x M.2 and PCIe x16 for graphics. In September when SiFive announced its FU740 (Freedom U740) SoC, the RISC-V chip designer said it would soon […] ⌘ Read more
Banana Pi BPI-M5 Pro Features Octa-core Rockchip RK3576 with 6 TOPS NPU
The Banana Pi BPI-M5 Pro is powered by the Rockchip RK3576 SoC, which includes a 6 TOPS NPU and supports up to 16GB of LPDDR4x RAM. This latest model enhances its predecessor with advanced computing capabilities, featuring dual GbE ports and flexible storage options. Unlike the original Banana Pi BPI-M5 launched in 2020, the new […] ⌘ Read more
《艾尔登法环》新DLC究竟讲了一个什么故事？
揭示了交界地熔炉时代的一段历史，也补全了玛丽卡悲惨的身世。
先来看几段关于熔炉的物品描述:
熔炉全护符:揉合 熔炉百相所有特征 的巨型块状物……据说是 源自巨人身体 的物品。在塔的神话中，此物被称为 熔炉之母。
燃炉面具：弯曲角围绕的那副石面具，据说是来自角人们的传说故事中，所提及的 火焰恶神。
熔炉鳞/羽/瘤护符：“此为生命初始之时的熔炉残存的痕迹，也是 局部性的隔代遗传，在古代具有神圣意义。然而在文明发展后，被视为玷污的象征。”
熔炉百相之角：此为黄金树的初始生命力量，熔炉百相之一。在过去，生命是相互混合，不分彼此。
熔炉薄翼护符：角人们认为熔炉相当神圣——因为在那 历经淬炼的进化尽头，就是他们身上的混生角。
各种角饰品+2:对角人们而言， 角是神圣的象征，也因此证明他们是受选的子民。 其中不停萌发新芽的混生角，则被视为灵力之首的象征。
旋流祷告：塔的祭司们施展的高阶 … ⌘ Read more
WebDAQ Series: Log, Monitor and Control Remotely
The WebDAQ series from Digilent consists of stand-alone data loggers designed for universal input applications, enabling remote system monitoring and control. This series includes three models: WebDAQ 904, WebDAQ 504, and WebDAQ 316, each engineered to cater to specific monitoring needs without the necessity of a personal computer. The WebDAQ 904 model is designed to […] ⌘ Read more
🧮 USERS:1 FEEDS:2 TWTS:1014 ARCHIVED:75547 CACHE:2361 FOLLOWERS:17 FOLLOWING:14
Vitess 20 is now Generally Available
Project post by the Vitess Maintainer Team We’re delighted to announce the release of Vitess 20 along with version 2.13.0 of the Vitess Kubernetes Operator. Version 20 focuses on usability and maturity of existing features, and continues to… ⌘ Read more
为什么燃油车很少刹车失灵，而新能源汽车刹车失灵概率高，这是什么原因？
我觉得横向对比吧，把相同的因素尽可能剔除掉，仅保留明显差异的变量。
因此关于驾驶辅助啊，自动驾驶这些我们先不考虑它。
我觉得其实最主要的因素可以归结到两点：
- 同级别的电动车，在重量上显著高于燃油i车（又在动力上很容易达到高速）
- 电动车为了操作便利性引入的“单踏板模式”对于用户的习惯培养
我们先说第一点： 重量！
将车辆制动下来，在燃油车时代和电动车时代有点小区别：
- 燃油车的制动力，通常包括：发动机制动（来自于泵气损失）+制动系统制动力
- 电动车的制动力，来自于：能量回收力矩+制动系统制动力
而需要制动的动能呢，本身和什么形式无关。只与车辆的速度和质量有关。根据高中物理中包含的动能公式，制动总能量为
![E=\frac{1}{2}mv^{2}](https://www.zhihu.com/equation?tex=E%3D%5Cfrac%7B1%7D%7B2%7Dmv%5E%7B … ⌘ Read more