发帖数: 1 | 1 关键就是白天太阳能继续的能量能够足够飞一晚上。。。
Aquila
Weight -- Aquila has a wingspan wider than a Boeing 737, but has to weigh as
little as possible to stay up for as long as possible. That's why the body
of the plane is made of a carbon fiber composite so the whole thing weighs
less than 1,000 pounds -- or about the same as a grand piano. We need to
continue to make it lighter.
Power -- The amount of energy Aquila collects from the sun during the day
has to be enough to keep its propellers, communications payload,... 阅读全帖 |
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w********2
发帖数: 632 | 2 An air-cooled rotary that powered a number of successful World War I
aircraft
History
The rotary engine is unique in that, unlike fixed radial engines, it has a
stationary crankshaft bolted to the firewall, with everything else (
cylinders, crankcase, propeller) all rotating. The rotary in its original
form is extinct, with the term now being used to describe "Wankel" rotary
combustion engines such as those built by Mazda. Though automotive and
motorcycle rotaries were built in the United State... 阅读全帖 |
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p***n
发帖数: 17190 | 3 https://www.upmedia.mg/news_info.php?SerialNo=69079
俄測試飛彈推進器爆炸釀5死 輻射值飆升憂車諾比核災再現
讚 80
分享 用LINE傳送
麥浩禮 2019年08月10日 17:35:00
SHAREgoogletwitterlinkedin
媒體小農
俄羅斯西北部海軍基地發生爆炸，並洩出輻射物質。（湯森路透）
俄羅斯西北部阿爾漢格爾斯克（Nyonoksa）海軍基地8日發生爆炸及輻射洩露事故。
研究人員對飛彈推進器進行測試時，疑似操作不當發生爆炸，造成5名研究人員死亡、3
人受傷，同時出現短暫輻射洩露事故，但俄羅斯國防部仍拒絕透露細節。
BBC News (World)
✔
@BBCWorld
Russia explosion: Five confirmed dead in rocket blast https://bbc.in/
2yNt1a0
Russian cruise missile test - file pic
Five confirmed dead in Russia rocket explosion
T... 阅读全帖 |
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m********6
发帖数: 1283 | 5 http://www.asianage.com/india/agni-v-indias-china-killer-306
Agni-V, India's 'China Killer'
India on Thursday successfully launched its long-range Agni-V ballistic
missile.
Here are some salient features of the missile and the test, which propelled
the country into a special league of nations:
* Agni-V is a 5,000-km intermediate range ballistic missile (IRBM)
* Short of an inter-continental ballistic missile (ICBM) by 500 km
* 17.5 metres long, can carry 1- to 1.5-tonne conventional and nuclear ... 阅读全帖 |
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M*V
发帖数: 3205 | 6 http://www.economist.com/news/leaders/21582256-emerging-market-
The emerging-market slowdown is not the beginning of a bust. But it is a
turning-point for the world economy
Jul 27th 2013 |From the print edition
WHEN a champion sprinter falls short of his best speeds, it takes a while to
determine whether he is temporarily on poor form or has permanently lost
his edge. The same is true with emerging markets, the world economy’s 21st-
century sprinters. After a decade of surging growth, in which t... 阅读全帖 |
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g********b
发帖数: 8461 | 7
当然有好坏之分,不同厂子出的.但大体上只要是个有名点的厂子出的(比如Gates)就没
问题.有些车有区别,比如大众的一些型号的原厂水泵用的是塑料的propeller,那个特别
爱坏,后来有很多厂子出金属的propeller版本的水泵,就非常好,买之前要做好research
. |
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Y*H
发帖数: 1582 | 8 不知道其他人有没有类似问题，说一下我经历的：
1. Driver side窗户没固定好，bumpy road会有晃动的声音(车窗打开时）。去dealer
检查是window regulator 坏了， fixed。 不理解Acura为什么不事先检查。
2. 比较严重的，awd bar从一格跳到2格 (both local and highway)时driver side
front suspension有noise。
- Humming noise (维持1秒左右）： 去dealer查说正常。开了10年车头一次遇到，暂
且信他们一次。
- Metal clicking noise (维持1秒左右）: 绝对是车的问题，已经联系dealer准备去
查结果今天就收到了recall notice.
"Acura has decided that a defect which relates to motor vehicle safety
exists in certain 2014 model year MDX vehicles. During assembly it is
possible ... 阅读全帖 |
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s******t
发帖数: 1956 | 9 Update:
On certain vehicles, during the manufacturing process of pressing the seal
cap onto the propeller shaft yoke, the seal cap may have been positioned
incorrectly. This could result in the seal leaking transmission oil onto hot
exhaust components, increasing the risk of fire resulting in injury and/or
damage to property. Correction: Dealers will replace the propeller shaft
assembly.
Affected products
Makes and models affected
Make Model Model year(s) affected
SUBARU LEGACY 2015
... 阅读全帖 |
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W***n
发帖数: 11530 | 10 Truck carrying Takata air bag materials explodes in Texas, killing one
(Reuters) - A truck transporting Takata Corp <7312.T> air bag propellant
material at the center of a global recall crashed and exploded in Texas last
week, killing one woman and injuring four other people, the auto parts
supplier said on Monday.
Takata said the truck, operated by a subcontractor, was traveling from a
Takata plant in Moses Lake, Washington, to a Takata warehouse in Eagle Pass,
Texas, early on Aug. 22 when an a... 阅读全帖 |
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发帖数: 1 | 11 之前站上有热心朋友帮忙内推了google, and facebook全职
结果google是没过简历关，facebook是我第一个面试搞砸了
找工作异常得不顺利， 最近做了vmware propel 的OA，是HR reach out 我的，题目很
简单都，leetcode easy 都算不上，但做完了还是被拒，然后1point3acres上有收到
onsite的（vmware propel是OA后 onsite）感觉这种事情，就是面得不错，莫名起码被
拒有3次了，有次是bloomberg
哎，如果能找到暑假实习也行，板上哪位能帮忙内推下，或者有什么实习机会介绍下
非常感谢
来美找个工作都成了难事，真是始料未及 |
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m***r
发帖数: 133 | 12 帮朋友发招聘信息，如有兴趣请发简历至email: c*****[email protected]
If interested, send a copy of resume to c*****[email protected]
(1) Web Architect
This role is instrumental in designing and delivering qPCR Consumer &
Business related applications that will help to propel Life Technologies
qPCR products into the internet & mobile space, make Life content accessible
to more devices, integrate with key partners in the cloud, and allow Life
Technologies qPCR services to scale with rapid growth in users.
We are seeking an indiv... 阅读全帖 |
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x****i
发帖数: 400 | 15 上星期在这里问大家，0.2 acre的院子，前房主没有好好收拾过，草质不好。地是斜坡
，不平。用了个电动的割草机搞了一年，这电动的实在功率太小，受不了。求推荐功率
大能适用于斜坡的割草机。
几个人都推荐self propelled，后轮比较大适合有坡的。我看上这款了，可这个Honda
21 in. Gas Variable Speed Self-Propelled Walk-Behind Mower， 怎么后轮不大呢。
http://www.homedepot.com/h_d1/N-5yc1v/R-100617092/h_d2/ProductD
我是想多花点钱弄个省力气的，特别是我们整个yard是在坡上。这样的后轮适用与坡地
吗？ |
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J****u
发帖数: 802 | 17 $300？能买着个还行的割草机么？不太懂割草机的行情
稍微考古了一下，看见很多都说honda,self propelled, gas不错，请问什么是self
propelled？不用自己推么？ |
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S*****0
发帖数: 816 | 18 不好意思,怪我说的不清楚,两款割草机分别是:
Toro 22 in. High Wheel Recycler (20331) Self-Propelled Walk-Behind Power
Mower ,model # 20331 $279
Troy-Bilt 6.75-Torque 21" Self Propelled Mower,Model #: 12A-A26M011$269
多谢！ |
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s***a
发帖数: 299 | 19 神器 is Honda ?
I think 10% off is only available in Lowes but Lowes does not sell honda.
that is why I am thinking to buy a Husqvarna from Lowes. any comments on it
? thanks BTW, is Self-Propelled really useful ? many people complained the
finger/wrist pain with Self-Propelled mower. thanks |
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w******t
发帖数: 16937 | 21 楼主知道自己认真考古，赞。你家草地不大，就push的，如果面积较大或者坡多坡陡，
就self-propelled的。多说一句，最近3个月，本版部分ID对于toro的推崇已经无以复
加，请楼主自己再研究一下吧。
我只考察出来Honda的是神器，但是到底是push的还是self-propelled的啊
★ Sent from iPhone App: iReader Mitbbs Lite 7.56 |
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b*********k
发帖数: 335 | 23 what is the difference of Front Drive Self-Propelled vs. others self-
propelled?
which one is easier for lawn with slope? |
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a****i
发帖数: 4783 | 24 push mower比self propelled的轻很多的，比如自走的要80磅的话，push的拉绳的也就
v60磅左右。因为不需要很多不必要的东西，维修率也小很多。正常人（包括女人）在
平地上推push mower不会有任何困难。我觉得self-propelled唯一的用处就是上陡坡，
但是如果是front drive，上陡坡毫无用处，所以我一直不知道front drive到底用来干
什么用的，也许是让勉强能走动的老头老太太用？ |
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z*****1
发帖数: 2210 | 25 还想问搂主一个问题，你为什么买Craftsman 160cc* 22'' Front Drive Self-
Propelled EZ Lawn Mower 50 States ，而没有买Craftsman 190cc* 22'' Front
Drive Self-Propelled EZ Lawn Mower 50 States。它俩有啥不同呀？不好意思，对这
个一窍不通。 |
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a*********n
发帖数: 1331 | 26 一直想买Toro Personal Pace Recycler 22 in. Variable Speed Self-Propelled Gas
Lawn Mower model#20332 $360 这个是rear wheel drive.
可是等了很久没见homedepot降价。homedepot会降价吗？
现在sears有craftsman的降价，从$400降到$250。估计这个价格很快会涨回去。
Craftsman 160cc* 22'' Front Drive Self-Propelled Mower Model#37060
http://www.sears.com/shc/s/p_10153_12605_07137060000P?sid=I0084
这款是front wheel drive.
我家1/4英亩草地，平地。该买哪个？ |
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y***j
发帖数: 11235 | 27 0.4X acre的lot，减去房子patiodriveway啥的估计1/3左右。
1/3 acre基本在cordless覆盖的最大范围。总是觉得用油的保养起来比较麻烦，估计运
行价格也高。院子有点儿坡度，所以还是需要self propelled??
看来看去电池的，review好像是black decker 的最好呢？正经大厂子都不做电动的？
带self propelled的更少，也就SPCM1936
电线的是不是肯定不行了。 |
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y***j
发帖数: 11235 | 28 恩，电池很重
self propelled都有90bls
不带的70bls，
还不知道那种好用，现在都是朋友开着小拖拉机帮我弄，也没试过带propelled和不带的 |
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z***m
发帖数: 1602 | 30 最后退了电动的买gas的了。电动的B&D的，345，根本割不动前院比较粗的草，而且机
身塑料，运到的时候都有两处crack了。草厚，推着很费劲，而且割不懂，马达都冒烟
了。最后买的是craftsman的7.25hp的，self propelled，platinum straggon引擎。也
是350左右，有push button， 一按就启动。机身做工也比较精细。下午割了下，5分钟
就基本搞定前院，self propell还是很给力的。结论是：买电动的，要草比较细比较浅
才行。 |
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v*******e
发帖数: 11604 | 31
Honda发动机好。Toro的self propell机械专利结构，别人copy不了。self propell的
割草机，要么买固定档位的，自动档位的必须买toro，否者累死大拇指不偿命。 |
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S*A
发帖数: 7142 | 36 买个二手的honda 带 self propel 的。
这个地不算太小，有 self propel 还是省力。 |
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S*A
发帖数: 7142 | 37 角度比较陡就确定了需要self propel，不可能太轻的。
没有 self propel 拿上拿下就很吃力。
山坡适合放养山羊。 |
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s*********5
发帖数: 1122 | 38 草坪面积大概0.35 acre
买rider还是self propell的？
用self propell的割草机，不收集碎草，割一遍大概要多长时间？ |
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p**********i
发帖数: 276 | 39 买Honda的不是不缺钱就是被忽悠瘸的。Lowes有Husqvarna all wheel drive的Push
mower，才$300多点。一个honda可以买两个这个，质量也没听说比Honda差。
Riding Mower的话，要考虑一下坡度。除非坡非常缓，一般Riding mower要求上坡下坡
往返剃，而不能沿着等高线往返。这样，坡度太大的话，对Transmission是个考验，
Engine功率也不要太小，否则没有力气拖其他attachments了。一般来说，bagger是个
必需。
一定不要买电的，一定不要买不带Self propelled的Push mower。否则累死没商量。如
果嫌Gas的维护麻烦，可以买装备Briggs的最新725EXi系列引擎的Self Propelled Push
Mower，这个引擎不需要换机油，不需要Choke，基本一拉就着，不过可靠性还未知。
而且这个引擎不是啥高端货，便宜~~ |
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r********9
发帖数: 75 | 40 谢谢您的回复，太有用了。在网上看的，这个牌子300以内的也就2款，
Husqvarna HU625AWD 150cc 22-in Self-Propelled All-Wheel Drive 2-in-1 ，和
Husqvarna HU725AWD 190cc 22-in Self-Propelled All-Wheel Drive 3-in-1，不知道
这两款 有什么区别呢
Push |
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g**********2
发帖数: 4881 | 43 it is always tough to get approved by WF (unlike Chase, Citi and BOA) unless
you have account with WF
Wells Fargo Propel World American Express® Card
Earn 40,000 bonus points when you spend $3,000 in net purchases (purchases
minus returns/credits) in the first 3 months
Wells Fargo Propel 365 American Express® Card
Earn 20,000 bonus points when you spend $3,000 in net purchases (purchases
minus returns/credits) in the first 3 months |
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J*******y
发帖数: 79 | 44 我有propel 365卡 和新propel卡基本一样 除了有年费 年费96天前付的 转卡也不给退
serve的卡吧。之前看到一个：
★ 发自iPhone App: ChineseWeb 1.0.6 |
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n****y
发帖数: 6260 | 45 punt 1 (pnt)
n.
An open flatbottom boat with squared ends, used in shallow waters and
usually propelled by a long pole.
v. punt·ed, punt·ing, punts
v.tr.
1. To propel (a boat) with a pole.
2. To carry in a punt.
v.intr.
To go in a punt. |
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t****g
发帖数: 35582 | 46 手推的。
我最近research的结果:
有三种:
1。电线的；
2。充电的；
3。汽油的。
绝大部分人用3。如果你嫌折腾汽油的麻烦话，就考虑1/2。2的话超过2000sqft的草地
就不要考虑了，充一次最多就割这么大。电线的就是拖着个辫子麻烦，所以大部分用汽
油的是有道理的。
汽油的手推又有几种。一种是自己推，push mower。一种是轮子有动力，self propell
的。如果原子坡度大或者不平可能需要后者。
割下来的草怎么办又分几种，最简单的就是side discharge，直接扔了。一种是mulch
，捣碎了给扔地里做肥料，一种是bagged，给装袋子里。稍微好点的就是3 in 1的，就
是三种都行。
还有一个重要的就是engine，汽油机。最好的是Honda的。另外就是后轮，越大越好。
最近Husqvarna有MIR，我去Lowes拎了个push的，用个10% off加上MIR 200出头一点。
如果你要self propell的sears有一款crafsman的，honda engine，大概280多。 |
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b**l
发帖数: 33123 | 47 听哥的，誓死得上self propell...
propell
mulch |
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y**z
发帖数: 4154 | 49 属实，这个link里的内容自己都没看完。。。
For Untitled Vehicles
Newly manufactured vehicles, issued a Manufacturer's Statement of Origin (SO
). For newly manufactured, self-propelled vehicles that are purchased from a
U.S. manufacturer, distributor, or dealer that become used (see section 4.1
) and are issued an SO, but not issued a certificate of title by any
jurisdiction of the United States, the owner must provide to Customs at the
time and place specified in this section, an original SO and two complete
copies... 阅读全帖 |
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y**********d
发帖数: 217 | 50 滑翔主要有两种方式，一是hangliding 悬挂式滑翔器滑翔； paragliding 滑翔伞滑翔
。你说的后面有propeller的，现在主要用在滑翔
伞上。traverse city 那个俱乐部提供这种方式.叫“ powered paragliding”。滑翔
器基本上用那个的不多，主要是因为安全问题。滑翔技术很
高的滑翔员才考虑。两种方式的费用来说，滑翔伞便宜很多，携带也方便一些。看起来
很好看。操作不如滑翔器灵活自由，事故发生率更高一
些。
一般来说，用propeller比较少一些。现在用得最多的方式有两种。一是 aerotow , 也
就是一架轻型飞机带动滑翔器起飞。cloud9 就用这种方
式。还有foot launching.需要山地。就是在山崖平台上跑步，靠山坡的上升气流起飞
。traverse city 用这种方式。 |
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