跳到主要內容

發表文章

目前顯示的是 2026的文章

GIAC aka XCAS

Main developer: Bernard Parisse Core engine: GIAC, a CAS (computer algebric system) in C++ Twitter: xialulee YouTube  tutorial  Grenoble presentation   Run it offline in your browser   Run it online  in your browser  GUI frontend:QGiac Github   , aka XCAS Who is using it? HP Prime Sagemath GeoGebra, flathub , Google play store FriCAS github , SandBox  

嫦娥6號 軌道器

嫦娥六号道器来说,它的外形是一个扁圆柱体,内部主要是四个球形贮箱,底部安装一台3000 N主发动机,其他部位的外壁上还有一系列姿控推进器,两侧有太阳能帆板,在返回器分离前为轨道器-返回器组合体提供电力。 對嫦娥六号轨道器来说,也是出现过变化,在完成月球背面采样之后,2024年9月,轨道器到达日地L2拉格朗日点,这一次任务为中国计划在 2028 年向 L2 发送 “地球 2.0” 寻找系外行星的任务提供了支持。 同时,嫦娥六号可能会测试与地面站的通信,并评估局部空间环境。 而在2025年12月中旬的时候,它在地月空间再次被在观察到,进行了3000公里的月球飞行,然后进入倾角较大、相当稳定的约 50 天的轨道。这不,在2025年12月31日的时候,它又发生了改变,进入到了一个倾角为85度,约40天的地心轨道,这是在干什么? 的确,这样的轨道变化并不知道,因为我国航天中心并没有针对其说明,反正当下通过测控,嫦娥六号的轨道器就是在不断发生改变。 所以,到底我国在扩展什么任务,可能只有后续公布了才知道,但正常情况来说,都是为未来我国更长远的太空任务做准备,或许也就是重要的通信系统提供支持,这跟嫦娥五号类似,因为在2025年底我国披露了一项重要计划。未来我国要建立深空系统在2025年12月的时候,《深空探测学报》发布新研究指出,中国将全力打造“鹊桥”星座,并且在2030年前,完成月球区域的构建,建成覆盖月球南极、月背等重点区域的试验系统,验证网络、导航、激光等关键技术,支持探月四期、载人登月、国际月球科研站等任务,然后在2040年前,建成覆盖地月空间的基本系统,在2050年前,建成覆盖行星际的拓展系统。 所以,这都说明了我国建立更大的系统,需要更多的测试,然后来完成,跟上面的嫦娥五号轨道器的验证可能是一样的。当然,这一个系统建设完成之后,我国的深空系统就更加庞大了,将服务范围覆盖月球、火星乃至太阳系边际,这就是它的实力。那么,嫦娥六号当下大概率也就是在完成这个任务,但是只要我们没有公布就不确定,只能说这会嫦娥六号的轨道器还在运行,并且扩展我国后续的更多任务。到底结果是什么,可能也不会公布,除非在未来我国建设某个深空项目的时候,才知道情况,这就是整个情况。  Ref 猫粮打賞 Scott Tilley twitter

易筋經

  Wiki 少林?武當? 很多專家認為易經經是明代天啟四年(1624年)浙江省台州市天臺縣紫凝山道人宗衡寫的 301as 非遺 八段錦

香港海魚

  黎諾維 香港街市海魚圖鑑 余嘉軒 @hkfishdiary358 過千魚標本 Tkww

Artemis II latest update asof jan 2026

  Launch timeline in pdf Colonbina1 Jonathan McDowell is asking for numerical trajectory data Preliminary: LEO Insertion: 162 km x 1,801 km parking orbit. • HEO Phase: 42-hour checkout in a high-eccentricity orbit (e approx. 0.88). • TLI Burn: Delta v boost to reach escape velocity (v_e approx. 11.2 km/s). • Lunar Flyby: Pericynthion at approx. 10,300 km from the surface. • Max Distance: 400,171 km from Earth (The d_max human record). • Entry Interface: 122 km altitude at Mach 32 (40,000 km/h). Scott manley comments SLS reference guide 2 feb Wet Dress Rehearsal YouTube  , from NASA Engineers conducted a first run at terminal countdown operations during the test, however, the countdown stopped at 5 minutes left due to a spike in the liquid hydrogen leak rate. Crew safety remains the highest priority. Engineers pushed through several challenges during the two-day test and met many of the planned objectives. To allow teams to review data and conduct a second wet dress rehearsa...

清式營造則例

梁思成 Wiki

高空擾動 Upper-air disturbance

 HKO FB 高空擾動 500 hPa prediction HKO ECMWF 500hPA prediction . Choose dimension as east asia. For 19 jan 2026 Himawari 9 realtime infrared image 鄭明典FB 冷高壓 中心氣壓仍維持1070左右,此高壓中心看起來是緩慢往東南方向移動! 但是追蹤低層冷空氣流向,主要的冷空氣受東側大低壓的影響,仍然是偏東出海,預期日、韓會有一波嚴寒的低溫,部分冷空氣往南,中國多數地方都發布寒潮與降溫預警。 這一次影響台灣的冷空氣可能要經過黃海、東海,在海面時間長,空氣相對潮濕。但是預期的降雨,還包括冷空氣上方的西風帶來的水氣,時間是20日晚間之後,這部分的水氣才是高山降雨的主要水氣來源。 21/1: 今晨,福建西部、江西南部、广东北部、广西、贵州西南部等地部分地区出现6~10℃降温,广西局地达12~14℃。气温0℃线位于贵州南部、湖南南部至江西中部、浙江北部一带。 气象专家提醒,寒潮天气已接近尾声,但低温状态还将持续一段时间。未来10天,新疆北部、内蒙古、东北地区、华北东部、黄淮、江汉、江淮、江南西北部等地平均气温将较常年同期偏低2~3℃,局地偏低4℃以上。 另一方面,日本,南北韓寒流則剛剛開始 KMA Severe winter storm in North America: Stratospheric  polar vortex  , UNRR , NOAA , noaa blog

Spitfires in HK

RAF Kai Tak wiki 81 squadron  small detachment  132 squadron   RAF-in-combat RHKAAF There are many variants, XIV , XIX, FR.18,  F.24 etc Final flight, according to  gwulo , two PR.Mk.19 models PS852 and PS854, and two F.24 VN318 and VN485 Some history in FB Display in   statue square , Kai Tak Ethos VN485 F.24(Mk24) in FB , now in IWM Duxford  In Kai Tak Crash gwulo Decals: Asisbiz RNAS kai tak

2026 有趣天象

 From 月面環形山 ZY-LunarCrater 上海天文館

Lazuli space observatory

 3M TMA Among the instruments aboard Lazuli is a camera with 23 CMOS detectors, each of which will be outfitted with fixed filters (both broadband and narrowband) covering wavelengths spanning the visible to near-infrared range (400 to 1,700 nanometers). The observatory will also have an integral field spectrograph, which takes spectra across an entire image as well as a coronagraph, a mask that blocks bright sources to enable detection of fainter ones. Supriya Chakrabarti (University of Massachusetts, Lowell), whose team has contributed to Lazuli, is excited to use that capability to directly image exoplanets around nearby stars. Lazuli is not a Hubble replacement. But it does offer competitive advantages, drawing on technology that is 20 years more advanced than what is onboard the iconic observatory. The announcement of the ambitious Schmidt Observatory System, one of the biggest releases to come out of last week’s American Astronomical Society meeting in Phoenix, Arizona, comes...

Soc camera from landingfield

  Wordpress SOC FPGA: Zynq7015

Pinefeat EF lens to raspberry pi

 From pinefeat uk Using libcamera, V4L and so on Github I think should be good fot macro photography, where you want to have focus stacking. Of course astrophotography  Reddit

錦田打礁的彬竹棚结構

  主力结橋 primary structure: 為中央部份杉木柱 (136枝垂直,共189枝) 及斜撐的杉木柱 加以鋼纜harness在地面 Subsidiary support輔助支撐: 竹枝,達3萬多枝 From 香港採古fb

分裂極渦 split polar vortex

  5/1/2026 「分裂極渦影響」,鄭明典貼出一張圖說,這是500百帕高度場(線條)和溫度場(底色)。日本北方一個大低壓,這個低壓內部完全是偏低溫的冷空氣(灰色到白色),而且越近中心越冷,這是極渦的特徵,所以這是個分裂極渦! msn Weathernews jp twitter Watchers   HKO 500 hpa chart

OG tech startracker v2 歐極星

  Assembly Bilibili   Printables Github   1.4 kg Payload 4 kg

OpenAstroExplorer

 Intro from cuiv Pretty portable @ 3kg,excluding tripod etc. 5 kg payload. Must try for DIYers. Online Fusion 3D view Shop OAT YouTube channel Github

Chocolate: flavanol and heavy metals

From YouTube: Flavanol Toxicity

JY-27 VHF meter wave radar

 Oct 2025 YouTube   Located near coastal area , GTVC Torres Finol JY-27 radar of the Chinese manufacturer CETC is a fully solid-state and fully coherent long-range early warning system. It is designed and developed to provide early warning information and detect low-observable air targets in so-called “Stealth Technology”. Besides, it provides the early warning information for weapons system as well. The newer one antenna design is clearly influenced by the 1L13 Nebo SV “Box Spring” and 1L119 Nebo SVU. The radiating elements are horizontally polarized. Frequency: 240 - 390 MHz Instrument range: 280 - 390 km Venezuela allegedly can detect stealth F-22 in 2020 Destroyed in 3 Jan 2026 How US jets beat YouTube Geoconfirmed Huawei phone leak? Full breakdown of maduro raid Reference: Baike

Stainless steel flask from Mainland

 After ~ 1 month of use: Black oil/ink appears from inner side. Oil ? Rust? Residue from Manufacturing process, eg polishing? Recycled steel? Heavy metals? Definitely not food grade!!! This quality label QB/T2332-97 means nothing  Update: Using the stainless steel test kit, N8 It shows to be 304, but low in nickel 鎳