##全金属的+全手动的+精密仪器
104723
1925
[1807 楼] Kievuser
[陈年泡菜]
17-6-16 15:39
其中组合动力是一种新型动力,其基本原理是集成火箭发动机、冲压发动机、航空发动机等不同动力模式,取长补短——飞行器起飞时,使用低速性能最高的航空涡轮发动机;达到一定速度后改用适应在大气层内高速飞行的冲压发动机;到达临近空间,再用火箭发动机进入太空。
这种组合动力用技术名词来讲就是涡轮-火箭-冲压组合循环发动机(TRRE),属于世界上最高端的空天动力技术。之前,外界总是说中国在各方面的动力技术上都落后于发达国家,但是现在情况已经开发发生重大变化。 据本届大会消息,TRRE目前已经完成了地面试验,今年年底前将开始飞行试验。这意味着※※在组合循环动力上已经达到世界领先水平,为高超音速飞行器的发展奠定了坚实基础。本届大会还公布了“腾云工程”的计划进度——在2025年完成关键技术攻关,2030年完成两级入轨空天飞行器技术验证试飞。........................ 像这样的消息不管是否有水分,总是令人兴奋的。 ![]() ![]() |
[1806 楼] Kievuser
[陈年泡菜]
17-6-16 13:55
Zeiss Ikon Contax II Black Paint Original and unique Contax II in black paint finish, with uncommon version of a collapsible Carl Zeiss Sonnar 2/5cm T no.2709698 with dark burnished brass tube. Shutter, viewfinder and rangefinder are fully functional, the black paint is original, but partly worn. it is a straight Dresden Contax in all respects, made during the war, well ahead of the (post-war) Jena model. All mechanical and optical parts are of Dresden manufacture, not a single part is of Jena (or even Kiev) origin. The painted parts of this camera have never been chrome plated - they were only planned to be, as a faint copper plating of the shutter speed ring and the winding knob suggest (the brass sheet metal parts are just painted raw brass). It also shows that the individual parts were black painted before they were screwed or riveted together and not after the assembly. Until now only a few black Contax II were discovered and all are post-war Jena Contax cameras made shortly after the war to test the acceptance of this finish. This camera is the only genuine black paint Dresden camera known to exist. Expertise by Dr. Milos Mladek, Vienna Catalogue Number: 375 Sale No: 35574 Condition: B- Year: c.1936 Serial No.: B 61851 Estimate: ![]() |
[1805 楼] Kievuser
[陈年泡菜]
17-6-15 07:24
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[1804 楼] Kievuser
[陈年泡菜]
17-6-15 07:22
Kievuser 发表于 2017-6-15 07:15 一些稀有镜头近年来屡屡拍出高价。这是仅有的两只样品之一。 ![]() |
[1803 楼] Kievuser
[陈年泡菜]
17-6-15 07:19
Kievuser 发表于 2017-6-15 07:15 其中有一台早期奥林巴斯旁轴相机。 ![]() |
[1802 楼] Kievuser
[陈年泡菜]
17-6-15 07:15
The 31st WestLicht Camera Auction on Saturday brought a crowded auction hall and thrilling bidding wars, leading to astonishing rises of numerous lots. The overall sales rate was above 90%. One of only two existing prototypes of a 35mm lens, produced for Leica M, rocketed from a starting price of 20,000 to sensational 90,000 Euros. An exceptionally beautiful and rare Leica M3 black paint from the 1959 series climbed well above its estimate to 48,000 Euros (starting price: 18,000 Euros; see image below). A Nikon One (starting price: 25,000 Euros), the first model of the Nikon from 1948, also fetched 48,000 Euros, and paid tribute to the centenary of the Japanese camera manufacturer. 最新一期的相机拍卖会消息。 |
[1801 楼] zdc911
[泡菜]
17-6-9 02:44
这个帖子,厉害了我的哥
本帖由IOS客户端发布 |
[1800 楼] Kievuser
[陈年泡菜]
17-5-26 18:18
Trump then delivered his 16-minute inaugural address of 1,433 words.[55] The speech was the shortest inaugural address since Jimmy Carter's in 1977.[56]
In late December 2016, Trump told visitors that he was writing the first draft of his inaugural address, citing previous inauguration speeches by John F. Kennedy and Ronald Reagan as inspirations.[57] Trump "insisted publicly that he wrote his own speech,"[58] although the Wall Street Journal and others reported that it had been written by Trump senior aides Stephen Miller and Steven Bannon.[58][59][60][61] The speech struck a tone that was both nationalist and populist.[59][56] The Los Angeles Times described the address as a "a truncated version of Trump's campaign rally addresses, absent specific policy and big on a sense of anger at what he defined as a ruling class that has raided America for its own benefit."[56] Historians and speechwriters termed the inaugural address as "one of the most ominous" in U.S. history,[59] striking an unusually dark and bleak note.[62][63][64][65] Former President George W. Bush allegedly referred to the speech as "some weird shit", according to unnamed reporters present at the inaugural address.[66][67] Trump pledged to end what he referred to as "American carnage,"[68][69][70] depicting the United States in a dystopian light—as a "land of abandoned factories, economic angst, rising crime"—while pledging "a new era in American politics."[62]........... 本帖的内容也表现了相当强的民族主义和平※※义啊。精英买办们一定不喜欢看的。 ![]() ![]() ![]() |
[1799 楼] Kievuser
[陈年泡菜]
17-5-22 11:44
李毅:
。。。。。’民族国家所不可或缺的、而美国决不会卖给中国的东西,特别是大规模杀伤性武器,如战斗机、※※※※、核※※、先进的雷达、先进的通讯设备,以及更为重要的用来生产这些产品的机器制造业和高级材料制造业。只有公有部门有能力研究、开发、制造这些产品。这就是为什么公有部门现在还雇用着大部分教育精英,尽管非公经济产出中国GDP的3/4到4/5。只要美国不向中国出售、并禁止其他国家向中国出售这些高技术产品,中国就必须维持一个强有力的公有经济。中国私有企事业主在这些领域里基本上无能为力。 不是因为中国私有企事业主无能,而是因为今日世界体系的本质不允许他们领导中国赶超世界先进国家。非公经济可以在中国赶超世界先进国家的过程中辅助公有经济,但仅仅是辅助,而不是领导。只有美国放弃对中国的技术封锁,中国的非公经济才有可能升级到高科技含量和更加资本密集的领域,但目前看不到一丝一毫美国放弃技术封锁中国的可能性。中国资产阶级因此不得不依附于国家,而不能领导国家。中国的领导集团是各级领导干部。” 哪个阶级制造两弹一星,制造第六代战机,制造※※※※,制造一箭二十星,制造※※※※,制造电磁武器,哪个阶级就是中国的领导阶级。目前,※※※※※领导两千多万国企工人制造这些东西。 买办们一度下马了大批此类项目。大大延缓了中华民族复兴的进度。 ![]() |
[1798 楼] Kievuser
[陈年泡菜]
17-5-8 12:05
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[1797 楼] 總是一個人走在昆侖山
[资深泡菜]
17-5-6 19:26
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[1796 楼] 熊看
[资深泡菜]
17-5-6 00:01
基本全金属 —— 比禄来不差的玛米亚C系列镜头群
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[1795 楼] Kievuser
[陈年泡菜]
17-5-5 18:26
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[1794 楼] Kievuser
[陈年泡菜]
17-5-5 17:51
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[1793 楼] 總是一個人走在昆侖山
[资深泡菜]
17-5-5 11:29
Kievuser 发表于 2017-5-5 10:06 咱们中国的光学研究机构还是非常厉害的,1000毫米 F6.7 反射头都做的这么出色的确值得国人自豪 ![]() ![]() |
[1792 楼] Kievuser
[陈年泡菜]
17-5-5 10:06
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[1791 楼] Kievuser
[陈年泡菜]
17-5-5 09:58
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[1790 楼] 總是一個人走在昆侖山
[资深泡菜]
17-5-5 09:41
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[1789 楼] 總是一個人走在昆侖山
[资深泡菜]
17-5-5 09:39
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[1788 楼] 熊看
[资深泡菜]
17-5-4 20:05
凑齐了7个焦段但不是全部规格......
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[1787 楼] Kievuser
[陈年泡菜]
17-4-27 03:55
图片,啊客网友的宝贝。留个资料。谢谢!
本帖最后由 Kievuser 于 2017-4-27 03:58 编辑 ![]() |
[1786 楼] Kievuser
[陈年泡菜]
17-4-22 18:21
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[1785 楼] Kievuser
[陈年泡菜]
17-4-22 18:14
Kievuser 发表于 2016-5-15 20:18 感觉稀有镜头的收藏近年来有后来居上的趋势啊。 参加过自卫反击战的国产稀有镜头。 ![]() ![]() |
[1784 楼] Kievuser
[陈年泡菜]
17-4-19 15:48
同样的目录,这只头就什么内容都没有。 ![]() |
[1783 楼] Kievuser
[陈年泡菜]
17-4-19 15:13
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[1782 楼] 卡卡猪
[泡菜]
17-4-19 09:12
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[1781 楼] Kievuser
[陈年泡菜]
17-4-18 22:58
几只早期国产光刻头。1970年代的产品。估计有关资料当年是保密的。现在也很难找到相关资料。只能参考日本的同类产品了。
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[1780 楼] Kievuser
[陈年泡菜]
17-4-18 18:08
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[1779 楼] 卡卡猪
[泡菜]
17-4-18 15:29
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[1778 楼] Kievuser
[陈年泡菜]
17-4-17 16:15
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