What's Gimbal Lock? Gimbal lock is the phenomenon of two rotational axis of an object pointing in the same direction. Actually, if two axis of the object become aligned, then we say that there's a gimbal lock. In other words, a rotation in one axis could 'override' a rotation in another, making you lose a degree of freedom. 万向节锁是什么 万象节锁是指物体的两个旋转轴指向同一个方向。实际上，当两个旋转轴平行时，我们就说万向节锁现象发生了，换句话说，绕一个轴旋转可能会覆盖住另一个轴的旋转，从而失去一维自由度 How Gimbal Lock occurred? Generally speaking, it occurred when you rotate the object which only use Eular Angles to denote it. The reason for this is that Eular angles evaluate each axis independently in a set order. Let's see a certain scene. First the object travels down the X axis. When that operation is complete it then travels down the Y axis, and finally the Z axis. The problem with gimbal lock occurs when you rotate the object down the Y axis, say 90 degrees. Since the X component has already been evaluated it doesn't get carried along with the other two axis. What winds up happening is the X and Z axis get pointed down the same axis. 通常说来，万向节锁发生在使用Eular Angles（欧拉角）的旋转操作中，原因是Eular Angles按照一定的顺序依次独立地绕轴旋转。让我们想象一个具体的旋转场景，首先物体先绕转X轴旋转，然后再绕Y轴，最后绕Z轴选择，从而完成一个旋转操作（飘飘白云译注：实际是想绕某一个轴旋转，然而Eular Angle将这个旋转分成三个独立的步骤进行），当你绕Y轴旋转90度之后万向节锁的问题就出现了，因为X轴已经被求值了，它不再随同其他两个轴旋转，这样X轴与Z轴就指向同一个方向（它们相当于同一个轴了）。
副教授生二胎遭解聘事件 续：当事人已重新上 班 http://news.sciencenet.cn/htmlnews/2012/6/265724.shtm I provide the link above, but not my views on the whole incident. What does this mean? Well, it's better to play safe (so that my Blog will not be deleted by the SciNet editors).
Well, I only know a few Spanish words, and SOPA is one of them, which means soup. PIPA is one of the fruits I used to get in China, but never had again since I left for America. Of course, they mean different things now, thanks to internet freedom fighters.
THE PRESIDENT: Good morning, everybody. The United States of America is the greatest force for freedom and security that the world has ever known. And in no small measure, that’s because we’ve built the best-trained, best-led, best-equipped military in history -- and as Commander-in-Chief, I’m going to keep it that way. Indeed, all of us on this stage -- every single one of us -- have a profound responsibility to every soldier, sailor, airman, Marine and Coast Guardsman who puts their life on the line for America. We owe them a strategy with well-defined goals; to only send them into harm’s way when it’s absolutely necessary; to give them the equipment and the support that they need to get the job done; and to care for them and their families when they come home. That is our solemn obligation. And over the past three years, that’s what we’ve done. We’ve continued to make historic investments in our military -- our troops and their capabilities, our military families and our veterans. And thanks to their extraordinary service, we’ve ended our war in Iraq. We’ve decimated al Qaeda’s leadership. We’ve delivered justice to Osama bin Laden, and we’ve put that terrorist network on the path to defeat. We’ve made important progress in Afghanistan, and we’ve begun to transition so Afghans can assume more responsibility for their own security. We joined allies and partners to protect the Libyan people as they ended the regime of Muammar Qaddafi. Now we’re turning the page on a decade of war. Three years ago, we had some 180,000 troops in Iraq and Afghanistan. Today, we’ve cut that number in half. And as the transition in Afghanistan continues, more of our troops will continue to come home. More broadly, around the globe we’ve strengthened alliances, forged new partnerships, and served as a force for universal rights and human dignity. In short, we’ve succeeded in defending our nation, taking the fight to our enemies, reducing the number of Americans in harm’s way, and we’ve restored America’s global leadership. That makes us safer and it makes us stronger. And that’s an achievement that every American -- especially those Americans who are proud to wear the uniform of the United States Armed Forces -- should take great pride in. This success has brought our nation, once more, to a moment of transition. Even as our troops continue to fight in Afghanistan, the tide of war is receding. Even as our forces prevail in today’s missions, we have the opportunity -- and the responsibility -- to look ahead to the force that we are going to need in the future. At the same time, we have to renew our economic strength here at home, which is the foundation of our strength around the world. And that includes putting our fiscal house in order. To that end, the Budget Control Act passed by Congress last year -- with the support of Republicans and Democrats alike -- mandates reductions in federal spending, including defense spending. I’ve insisted that we do that responsibly. The security of our nation and the lives of our men and women in uniform depend on it. That’s why I called for this comprehensive defense review -- to clarify our strategic interests in a fast-changing world, and to guide our defense priorities and spending over the coming decade -- because the size and the structure of our military and defense budgets have to be driven by a strategy, not the other way around. Moreover, we have to remember the lessons of history. We can’t afford to repeat the mistakes that have been made in the past -- after World War II, after Vietnam -- when our military was left ill prepared for the future. As Commander in Chief, I will not let that happen again. Not on my watch. We need a start -- we need a smart, strategic set of priorities. The new guidance that the Defense Department is releasing today does just that. I want to thank Secretary Panetta and General Dempsey for their extraordinary leadership during this process. I want to thank the service secretaries and chiefs, the combatant commanders and so many defense leaders -- military and civilian, active, Guard and reserve -- for their contributions. Many of us met repeatedly -- asking tough questions, challenging our own assumptions and making hard choices. And we’ve come together today around an approach that will keep our nation safe and our military the finest that the world have ever known. This review also benefits from the contributions of leaders from across my national security team -- from the departments of State, Homeland Security and Veterans Affairs, as well as the intelligence community. And this is critical, because meeting the challenges of our time cannot be the work of our military alone -- or the United States alone. It requires all elements of our national power, working together in concert with our allies and our partners. So I’m going to let Leon and Marty go into the details. But I just want to say that this effort reflects the guidance that I personally gave throughout this process. Yes, the tide of war is receding. But the question that this strategy answers is what kind of military will we need long after the wars of the last decade are over. And today, we’re fortunate to be moving forward from a position of strength. As I made clear in Australia, we will be strengthening our presence in the Asia Pacific, and budget reductions will not come at the expense of that critical region. We’re going to continue investing in our critical partnerships and alliances, including NATO, which has demonstrated time and again -- most recently in Libya -- that it’s a force multiplier. We will stay vigilant, especially in the Middle East. As we look beyond the wars in Iraq and Afghanistan -- and the end of long-term nation-building with large military footprints -- we’ll be able to ensure our security with smaller conventional ground forces. We’ll continue to get rid of outdated Cold War-era systems so that we can invest in the capabilities that we need for the future, including intelligence, surveillance and reconnaissance, counterterrorism, countering weapons of mass destruction and the ability to operate in environments where adversaries try to deny us access. So, yes, our military will be leaner, but the world must know the United States is going to maintain our military superiority with armed forces that are agile, flexible and ready for the full range of contingencies and threats. We’re also going to keep faith with those who serve, by making sure our troops have the equipment and capabilities they need to succeed, and by prioritizing efforts that focus on wounded warriors, mental health and the well-being of our military families. And as our newest veterans rejoin civilian life, we’ll keep working to give our veterans the care, the benefits and job opportunities that they deserve and that they have earned. Finally, although today is about our defense strategy, I want to close with a word about the defense budget that will flow from this strategy. The details will be announced in the coming weeks. Some will no doubt say that the spending reductions are too big; others will say that they’re too small. It will be easy to take issue with a particular change in a particular program. But I’d encourage all of us to remember what President Eisenhower once said -- that “each proposal must be weighed in the light of a broader consideration: the need to maintain balance in and among national programs.” After a decade of war, and as we rebuild the source of our strength -- at home and abroad -- it’s time to restore that balance. I think it’s important for all Americans to remember, over the past 10 years, since 9/11, our defense budget grew at an extraordinary pace. Over the next 10 years, the growth in the defense budget will slow, but the fact of the matter is this: It will still grow, because we have global responsibilities that demand our leadership. In fact, the defense budget will still be larger than it was toward the end of the Bush administration. And I firmly believe, and I think the American people understand, that we can keep our military strong and our nation secure with a defense budget that continues to be larger than roughly the next 10 countries combined. So again, I want to thank Secretary Panetta, Chairman Dempsey, all the defense leaders who are on this stage, and some who are absent, for their leadership and their partnership throughout this process. Our men and women in uniform give their very best to America every single day, and in return they deserve the very best from America. And I thank all of you for the commitment to the goal that we all share: keeping America strong and secure in the 21st century, and keeping our Armed Forces the very best in the world. And with that, I will turn this discussion over to Leon and to Marty, who can explain more and take your questions. So thank you very much. I understand this is the first time a President has done this. It’s a pretty nice room. (Laughter.) Thank you guys. END 原文见 http://www.whitehouse.gov/the-press-office/2012/01/05/remarks-president-defense-strategic-review
As I started to pay some attention to the Amanda Knox case two days ago, I wondered about the cost to free her yesterday. Here is the answer: http://news.yahoo.com/blogs/cutline/why-won-t-uproar-news-outlets-pay-amanda-221739532.html
中国， 请停下你飞奔的脚步，等 一等你的人民，等 一等你的灵魂，等 一等你的道德，等 一等你的良知！ 不要让列车脱轨，不 要让桥梁坍塌，不 要让道路成陷阱，不 要让房屋成危楼。 慢点走，让 每一个生命都有自由和尊严， 每一个人都不被‘时代'抛下， 每一个人都顺利平安地抵达终点 。 China, please stop your flying pace, w ait for your people, w ait for your soul, w ait for your morality, w ait for your conscience! Don’t let the train run out off track, do n’t let the bridges collapse, do n’t let the roads become traps, do n’t let houses become ruins. W alk slowly, allowing every life to have freedom and dignity. No one should be left behind by our era. 注：中文转自英国金融时报，英文转自纽约时报，中文初始来源不详。 又注： 专栏作家媒体人童大焕在其文章 中 哀悼温州高铁事故：“中国，请停下你飞奔的脚步，等一等你的人民，等一等你的灵魂，等一等你的道德，等一等你的良知！不要让列车脱轨，不要让桥梁坍塌，不 要让道路成陷阱，不要让房屋成危楼。慢点走，让每一个生命都有自由和尊严，每一个人都不被‘时代’抛下，每一个人都顺利平安地抵达终点。——为高铁温州坠 落事故哀。”引发民众共鸣大量转发转载，并被媒体关注和引用 ，《 纽约时报 》在报道温州铁路事故中也引用了这段话 。
Defining academic freedom December 21, 2010 By Cary Nelson These points are mostly adapted from nearly 100 years of American Association of University Professors policy documents and reports. Since its 1915 founding, the AAUP has been the primary source of the documents outlining the basic principles of faculty rights and responsibilities. It is also the source of perhaps the single best statement of student rights. Putting the principles above into practice, of course, requires a goodly amount of additional detail, information the AAUP continues to provide and update. Cary Nelson is president of the American Association of University Professors and professor of English at the University of Illinois at Urbana-Champaign. He is the author, most recently, of No University Is an Island: Saving Academic Freedom (NYU, 2010).
Fries:from French to freedom By Eingeer JI Two lovers,they all love French fries. One of them is a French man The other American In 2003,at the War between Iraq and America. The man do not like the war; Did like his lover.(?????) The two went to a fries restaurant. The man:these are your French fries. The woman: thanks for your Freedom Fries. Fries are the same fries Of French or Freedom? photo:from a net
标签: freedom
