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宇航員有望在國際空間站上喝咖啡

宇航員有望在國際空間站上喝咖啡

科學家認爲在微重力的環境中飲用咖啡是一個非常困難的事情

腾讯科学讯据国外媒体报道，波特兰州立大学的研究人员开发出一种能够在微重力环境下喝咖啡的技术，或许我们可以称之为微重力饮水杯。根据波特兰州立大学的官方消息，新的设计能够使宇航员在微重力环境中也能饮用咖啡。在去年夏天，波特兰州立大学就进行了相关消息的公布，目前所进行的测试是第二次这样的尝试，科學家認爲在微重力的環境中飲用咖啡是一個非常困難的事情，这表现在流体表面受到张力的问题，日常生活中非常简单的喝咖啡动作在微重力环境中就变得异常困难。

博士生德魯沃爾曼等人對新的設想進行了測試，工程師認爲這款微重力環境中能夠自動飲用的咖啡機應該更加智能，比如內置芯片可能對流體進行控制，而不需要輔助結構。在2014年11月23日至25日于舊金山舉辦的流體力學會議，美國航空航天局科學家約翰·格拉夫等人對微重力環境中的咖啡機進行了介紹。美國宇航局預計在2015年2月時使用SpaceX公司的火箭將3D打印的咖啡杯送往空間站，讓宇航員也能夠在太空中享受咖啡的味道。

微重力咖啡杯技術已經在研制之中，整套裝置包括了毛細通道流量、毛細通道流動實驗-2等部件，從這些儀器可以看出，零重力咖啡杯實際上利用了我們對毛細通道流量的控制技術，能夠讓咖啡的流量得到控制，也實現了宇航員在空間站中喝咖啡的願望。美國宇航局預計在明年國際空間站會提供簡單的飲料，比如果汁、桃子芒果奶昔等。

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"We walked by the side of our teams or behind the wagons, we slept on the ground at night, we did our own cooking, we washed our knives by sticking them into the ground rapidly a few times, and we washed our plates with sand and wisps of grass. When we stopped, we arranged our wagons in a circle, and thus formed a 'corral,' or yard, where we drove our oxen to yoke them up. And the corral was often very useful as a fort, or camp, for defending ourselves against the Indians. Do you see that little hollow down there?" he asked, pointing to a depression in the ground a short distance to the right of the train. "Well, in that hollow our wagon-train was kept three days and nights by the Indians. Three days and nights they stayed around, and made several attacks. Two of our men were killed and three were wounded by their arrows, and others had narrow escapes. One arrow hit me on the throat, but I was saved by the knot of my neckerchief, and the point only tore the skin a little. Since that time I have always had a fondness for large neckties. I don't know how many of the Indians we killed, as they carried off their dead and wounded, to save them from being scalped. Next to getting the scalps of their enemies, the most important thing with the Indians is to save their own. We had several fights during our journey, but that one was the worst. Once a little party of us were surrounded in a small 'wallow,' and had a tough time to defend ourselves successfully. Luckily for us, the Indians had no fire-arms then, and their bows and arrows were no match for our rifles. Nowadays they are well armed, but there are[Pg 41] not so many of them, and they are not inclined to trouble the railway trains. They used to do a great deal of mischief in the old times, and many a poor fellow has been killed by them." The boys looked in the direction indicated, but could see nothing. This is not surprising, when we remember that sailors' eyes are accustomed to great distances, and can frequently see objects distinctly long before landsmen can make them out. Mr. Charlton's melancholy eyes seemed to be fixed on space. Just for the moment he had forgotten that he was not alone. Lawrence gave a sympathetic cough. As a matter of fact, he had not yet explained what he was doing there, and the longer the explanation was postponed the better he would be pleased. "You see our patient has gone," Balmayne said smoothly. "As a matter of fact, the whole thing was a ridiculous mistake. But you must not blame us. The blame is due to the charming young lady who sent for you. But that is one of the drawbacks of your noble profession. Goodnight." In one of the inmost circles, a sacred elephant had gone must, breaking his ropes, and confined now by only one leg. The chains fastened round his feet as soon as he showed the first symptoms of madness were lying broken in heaps on the ground. The brute had demolished the walls of his stable and then two sheds that happened to be in his way; now he was stamping a dance, every muscle in incessant motion, half swallowing his trunk, flinging straw in every direction, and finally heaping it on his head. A mob of people stood gazing from a distance, laughing at his heavy, clumsy movements; at the least step forward they[Pg 113] huddled back to fly, extending the circle, but still staring at the patient. In an adjoining stable were two more elephants very well cared for, the V neatly painted in red and white on their trunks, quietly eating and turning round only at the bidding of the driver; but one of them shed tears. The rajah's sleeping-room has at one end a dais ascended by three steps; here the sovereign's bed used to be spread; and here, now, the judges of the Supreme Court have their seats. In the middle of the room was a confused array of benches and tables, and against the walls, also washed with yellow, hung a series of portraits of bewigged worthies. No new clues offered themselves. He detached one of the hard, adhering chunks of gum and dropped it into his pocket, “just in case,” he said, half-grinning, “just in case they transfer themselves somewhere else. I’ll leave twenty-nine of them—and see.” The Lieutenant and Si and Shorty tried to make themselves believe that the noise was receding, showing that the rebels were being driven. At times it certainly was so, and then again it would burst out, Naturally, the boys were big-eyed all the time with the sights that filled the landscape near and far. Wherever they looked they were astonished, and when in a march they came out on a crest that commanded a wide view, they could not help halting, to drink all its wonders in. Even the experienced Si and Shorty were as full of amazement as they, and watched with fascination the spectacle of mighty preparation and concentrated power. "It has a great deal to do with this lecture with which you have favored us," answered the Major dryly. "But we'll not discuss that in open court. Are you through with the witness, Judge-Advocate? If so, call the next." "But I'm not going to leave you alone to brood," Albin said. "Because I'm your friend. And brooding isn't good for you. It's brooding that's got you into such a state—where you worry about growing things, for God's sake, and about freedom and silly things like that." Albin grinned. "What you've got to do is stop worrying, and I know how to get you to do that, kiddo. I really do." "Where may I learn the others?" But Gornom didn't answer, and Cadnan's breathing-space was over. He had to be back at the board, pushing buttons, watching carefully. Gornom stood behind him, peering over his shoulder with a cloudy eye. Neither said a word until the new spell of work was over. Then Cadnan repeated his question. He had become separated from the other searchers, and was alone on the west side of the Moor. The wind barked and howled, hurling itself upon him as he stood, beating his face with hail, which hissed into the dead tangles of the heather, while the stripped thorns yapped and rattled, and the bushes roared. So great was the tumult that he seemed to fall into it like a stone into a wave—it passed over him, round him, seemed even to pass under him, he was hardly conscious of the solid ground. The blackness was impenetrable, save where his lantern stained it with a yellow smudge. He shouted, but his voice perished in the din—it seemed as if his whole man, sight, voice, hearing, and sensation, was blurring into the storm, as if Boarzell had swamped him at last, made him merely one of its hundred voices, mocking the manhood which had tried so much against its earth. While the guide paused for a moment to recollect the way to the head-quarters of the insurgents, some one who passed was heard speaking in a tone which fell upon Stephen's ear like a sound he ought to remember; he sprang from the side of his comrades, and, standing before the strangers, demanded, "With whom hold you?" HoME 偷偷拍自拍15pENTER NUMBET 008ericdress.com.cn
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