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From David Ogawa: Landing Accuracy Explained The booster contains high precision GPS, gyroscopes, and accelerometers at both top and bottom ends to precisely interpolate the booster orientation, position, and velocity. The booster also contains a huge number of strain gauges that monitor forces on the structure at crucial locations, especially engine thrust. (Strain gauges are exquisitely sensitive thin films that are bonded to surfaces to electrically measure the stretching and compression of structures.) All of these data inputs are timestamped so the three-way redundant computers can calculate where the booster was microseconds ago. By comparing the past position and vector to the desired course, the latest navigation error is calculated. The computers run many physics equations on graphics cards. These are used to optimize the flight path, calculate errors, and control thrust vectoring, grid fin positions, and cold gas thruster durations. The booster h...

“We’re moving into a new era,” Jim Bridenstine said 19 Dec 2019. “We are going to launch American astronauts, on American rockets, from American soil for the first time since the retirement of the space shuttles.”  animation and objectives Boeing Starliner made a smooth launch on 20 Dec, 2019. But failed to reach ISS. It was found due to Mission Elapsed Timer error. The spacecraft’s mission elapsed timer, which is set by communicating with its Atlas 5 rocket prior to liftoff, was off by 11 hours. That caused the spacecraft to think it was on the wrong phase (ISS Station proximity ops) of its mission after separation from the rocket’s upper stage, triggering thruster firings that used excessive amounts of fuel until ground controllers could take over and turn off the thrusters. After being released by the rocket(MECO), Starliner was supposed to use its Orbital Maneuvering and Attitude Control engines to provide the thrust needed to reach a stable orbit(1) and begin ...

Huawei has named the folding phone’s structure “Falcon Wing”(鷹翼式) and its specialists have been taking a shot at this plan for a long time. When you crease the cell phone, there are no holes between the cell phone’s front and the back. Huawei says there are more than 100 parts on the cell phone’s pivot, which it has licensed. For Huawei, each pixel size is roughly 0.05 mm or 50 microns or 414 ppi 采取四层结构设计，最上面一层是高分子材料的屏幕保护层，第二层是可弯曲的柔性屏幕，第三层是软胶支撑片，最下面一层是转轴。 转轴的重要性和难点在于，屏幕和转轴是一个耦合关系，涉及到复杂的运动原理。在屏幕硬件长度不变的情况下，手机弯折和伸展的过程中，HUAWEI Mate X需要通过转轴结构的自动伸缩，实现对0-180度开合状态下的屏幕进行同步、精准、连续的支撑。 在每一个角度下，转轴的部件都要基于运动原理沿着一个导轨运动，并精准伸出对应的长度，来配合屏幕的位移和受力。如果出现运动误差，屏幕就会在挤压和伸展时受到损伤，进而影响手机的使用寿命。 Samsung Galaxy Fold: The  bend radius in Samsung Fold is ~ 1.5mm. Whereas 4.4 mm bend radius in Moto Razr V4. Conclusion: When folded( ie when phone is not in use), Huawei's screen is stretched. Samsung's is not. Samsung's better The stre...

If the GDP growth of both regions is somewhat co-related, Q4 18 to Q3 19, China's GDP has been  contracting for 0.6 %(from 6.8 to 6.2 %). In the same time frame, HK's GDP has contracted for 6.3% ( 3.4% to - 2.9%) percentage change normalised to Q4 16 figures “The Hong Kong economy saw an abrupt deterioration in the third quarter of 2019, as the - local social incidents dealt a very severe blow to an economy already weakened by - a synchronised global economic slowdown and - US-Mainland trade tensions,” said Hong Kong Government Economist Andrew Au. Four key industries: The major declines are gross domestic fixed capital formation and exports of goods Gross domestic fixed capital formation covers the gross value of expenditure on building and construction as well as machinery, equipment and intellectual property products(including computer software, databases and research and development); and costs of ownership transfer. CEIC China CEIC HK ...

Grind by Weight:  integrated high-precision load cell ( upto 0.1 g accuracy ) ground breaking real-time scale controlled dosing for unmatched control over your espresso quality. High consistency: - DDD ( burr Disc Distance Detection) upto 0.01 mm burr size: 65mm disc motor speed: 1450 / 1600 ( 50 Hz/60 Hz) control. via LCD display and mobile app. Can save grind recipes in the app. So you can fine tune the grind profile, by setting different grind size profile, eg for a 18g grind, it can be made of 8 g of 0.14mm gap, and 10g of 0.16mm gap coming soon target to be start delivery: May 2020 website

The Nokia 9 powered by the Qualcomm Snapdragon 845 Mobile Platform is a major achievement in computational photography. Thanks to a collaboration with HMD, Light, and Qualcomm Technologies, the Nokia 9 is the world’s first smartphone to feature a five-camera array. Every time you take a photo, the cameras collectively capture and process up to 240 megapixels of data, which is then used to create one stunning 12-megapixel photo and a corresponding 12-megapxiel depth map. This is the largest amount of photography data ever captured and processed by a Snapdragon 845 device. By combining the best parts of the data to form one image, the Nokia 9 is designed to ensure your photos feature stunning sharpness, bright colors, dynamic range(12.4 stops), and depth for realistic-looking Bokeh. The five-camera modules that make this possible are nearly the same. They contain the same Sony IMX486 image sensors, which have 1.2μm size pixels, and lenses, which have 28mm focal length with brig...

TripleCell platform can deliver components that are pretty close to traditional performance cushioning, thanks to the proprietary photopolymer Rebound Resin that was developed as a result of the partnership. Rebound Resin was designed in order to make resilient, springy lattice structures with, according to a Formlabs press release, “the durability, reliability, and longevity expected from an injection molded thermoplastic.” simulation The TripleCell 3D printed components deliver more lively, spring-like cushioning than you’ve ever experienced in foam, with the ability to ultimately be produced on-demand in our own facilities in Massachusetts. Rebound resin material

Allais paradox The Allais paradox conclusively shows that when people are pressed for answers in quick time spans, they often give inconsistent answers. But that does not necessarily mean they have inconsistent preferences.  Recency bias Recency bias is the phenomenon of a person most easily remembering something that has happened recently, compared to remembering something that may have occurred a while back. Gambler's fallacy The gambler's fallacy, also known as the Monte Carlo fallacy or the fallacy of the maturity of chances, is the mistaken belief that if something happens more frequently than normal during a given period, it will happen less frequently in the future (or vice versa)

The third rail of a nation's politics is a metaphor for any issue so controversial that it is "charged" and "untouchable" to the extent that any politician or public official who dares to broach the subject will invariably suffer politically. The metaphor comes from the high-voltage third rail in some electric railway systems. Touching a third rail can result in electrocution, so usage of the metaphor in political situations relates to the risk of "political suicide" that a person would face by associating with a certain cause, topic, or subject having a highly controversial or offensive nature. Joe Tsai said Territorial integrity and sovereignty as non-negotiable (third rail) issues wiki

target marker drop a few weeks ago, to measure the gravity of the asteroid Ryugu the plan first picture of rover2 after separation The location of minerva- II2, lower right of the Hayabusa 2 But it seems there is problem to initialise the on-board computer  properly. Instrument on the rover2 includes a camera, temperature sensor, acceleration sensor astroarts Luca Cassioli aliveuniverse  

據悉 ，六月來港的內地團每日有200至300團，但因為安全問題，目前每日已取消50至60團 實際: 六月份內地游客,跟去年(2018年)比較,上升了 2.4 % (1,448,854 增至1,483,392) 6月23 :  香港旅遊產業總工會主席謝北拱表示, 有本港旅遊業界指，受連日衝突事件影響，來港內地旅行團已銳減三分之一，不少原定七一來港的內地團因擔心安全而取消，預計七一內地入境團將較去年減少一成半。 實際:年初至今:整體游客數字, 跟去年(2018年)比較, 上升了 8.4 % (36,967,261 增至40,068,825). 內地游客上升了 9.5 % (28,991,823 增至 31,734,205) 祗是7月份內地游客有輕微下跌 5.5% ( 4,402,955 跌至4,160,688) 8月23 : 商務及經濟發展局局長邱騰華表示，近期公眾活動事件衝擊本港旅遊業、零售業、酒店業，最新訪港旅客數字按年下跌五成，情況明顯令人憂慮。 邱騰華今日在記者會上表示，本港旅遊業受近期事件影響，訪港旅客數字自7月中起由升轉跌，當時按年跌幅為1.5%；但8月15至20日的最新數字顯示，跌幅為49.6%，即不論旅客來自何處，整體數字較去年同期下跌一半，為近年最大跌幅。 (will update soon when Aug statistics are available) 旅遊提示方面，邱騰華表示，早前有22個國家就其國民來港發出旅遊提示，現已增至31個國家。 酒店方面，他指，去年8月份平均入住率有90%，但今年8月個別地區酒店入住率跌幅達30%至40%，部分更下跌逾一半。零售業方面，最近零售管理協會已指出，8月份零售數字下跌約五成。 邱騰華表示，未來日子，香港機場的安全和營運，以至本港整體社會情況都會備受海內外人士關注。他希望早日恢復社會秩序，以減少對市民生活或經濟的影響。  9月25: 十一黃金周、重陽節假期將至，入境處預料9月28日至10月7日，會有約737萬人次，經各海、陸、空管制站進出香港，當中約79%的旅客，即約581萬人次，會經各陸路邊境管制站進出香港。 入境處又預計，10月1及5日（星期二及星期六）分別為陸路入境及出境較為繁忙的日子，人次約為38.3萬及44萬。不過翻查去年國...

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