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2019年09月17日 20:17:55    日报  参与评论()人

枣阳妇幼保健院看病贵不贵襄阳妇幼保健院引产U.S. scientists released fresh data bolstering the case for the existence of the Higgs boson, a long-sought particle crucial to scientists#39; current understanding of how the universe is built. 美国的科学家公布了持希格斯玻色子(Higgs boson)存在的最新数据。希格斯玻色子是人类长期以来一直在寻找的一种粒子,它对于科学家目前对宇宙构成的理解非常重要。 The data, from the U.S. Department of Energy#39;s Tevatron collider near Chicago, isn#39;t enough on its own to confirm the existence of the Higgs particle. However, experimental results to be announced by European physicists on Wednesday will provide a stronger signal of where the Higgs is likely to be hiding. 这些数据来自于芝加哥附近的美国能源部正负质子对撞机。单凭这些数据并不能够明希格斯玻色子的存在。不过,欧洲物理学家周三即将公布的实验结果将为希格斯玻色子可能隐藏在何处提供更多线索。 Proof that the particle exists would help explain a big puzzle: why some objects in the universe-such as the quark, a constituent of protons-have mass, while other objects-such as photons, the constituent of light-possess only energy. 希格斯玻色子存在的据将有助于解释一个重大疑问:为什么宇宙中的有些物质有质量,比如构成质子的单元夸克,而其他物质仅拥有能量,比如构成光的粒子光子。 By extension, its discovery would help explain the presence of stars, planets and humans, and thus rank as one of the biggest coups for modern-day physics. 进一步讲,希格斯玻色子的发现将有助于解释恒星、行星和人类存在的原因,因此被认为将是现代物理学最重大的发现之一。 The officials at the European particle-physics laboratory CERN, meanwhile, are tight-lipped. ;Whatever is announced on Wednesday will be interesting,; said James Gillies, spokesman for the European lab. As to whether or not it might confirm the discovery of Higgs, ;it#39;s nature who will decide, not us,; he added. 欧洲的粒子物理实验室──欧洲核子研究组织(CERN)的官员目前仍保持着沉默。该组织发言人吉利斯(James Gillies)说,无论周三公布了什么消息,都会十分有趣。至于这些数据是否会实希格斯玻色子的存在,吉利斯说,这要由自然来决定,不是我们。 Because nobody knows what the mass of a Higgs boson might be, the particle must be hunted indirectly, typically in giant machines that propel particles to near-light speed, then smash them together and generate an array of other subatomic particles. 由于没有人知道一个希格斯玻色子的质量可能是多少,该粒子必须通过间接方式被得到。一般是通过庞大的加速器使粒子达到接近光速,然后让这些粒子相互撞击,从而制造出一系列其他的亚原子粒子。 /201207/189164襄阳老河口市人民医院妇产科怎样 襄樊市二级医院有哪些

襄樊市中心医院是什么医院襄阳襄州区妇幼保健院中医院是私立的么 Two new studies offer signs that this could be changing quickly. One offers a new way to produce solar cells more cheaply and safely than current methods. The other indicates that concentrating solar power, which uses the sun’s energy to heat up a liquid that drives a turbine, could supply “a substantial amount of current energy demand.”两项新研究提供的迹象表明,这种状况有可能会迅速发生改变。其中一项研究提供了一种全新的太阳能电池生产方式,它要比现有方法更便宜,更安全。另一项研究显示,聚焦式太阳能发电系统(即使用太阳的能量来加热液体,以驱动涡轮机,简称CSP)能够满足“目前相当大一部分能源需求。”In a study released Wednesday in journal Nature, University of Liverpool’s Jon Major and several other researchers announced that they had found that magnesium chloride, which is used in making tofu, bath salts and applied to roads in the winter could replace cadmium chloride in the making of second-generation, think-film solar cells.《自然》杂志(Nature)上周三发布的一份研究报告中,利物浦大学(University of Liverpool)的乔恩o梅杰和其他几位研究人员宣称,氯化镁可以取代生产第二代薄膜太阳能电池所用的氯化镉。氯化镁是制作豆腐和浴盐的原料,还可用来融化冬季道路上的冰雪。Speaking in a teleconference from Copenhagen, Major said magnesium chloride, which is extracted from seawater, would cost .001 per gram compared to .3 for cadmium chloride. It would also eliminate the challenges and expense of handling cadmium chloride, a highly toxic compound that requires elaborate safety measures to protect workers during its manufacture and a special disposal process when panels are no longer needed.梅杰在哥本哈根参加一个电视电话会议时表示,氯化镁源自海水,每克成本仅为0.001美元,远低于每克0.3美元的氯化镉。此外,它还能够消除处理氯化镉的挑战和费用——氯化镉是一种剧毒化合物,需要复杂的安全措施来保护生产工人,废弃的电池板也需要一道特殊的处理程序。“So what we have done without any loss of efficiency is to replace expensive and highly toxic material with one that is completely benign and much lower cost in the process,” Major said. “This offers a great cost benefit for production of these kinds of solar cells and could help make a step change in the production of them.”“所以,我们完全可以用一种完全良性而且成本低得多的物质来取代这种昂贵且带有剧毒的原料,而且无需承受任何效率损失,”梅杰说。“对于各种太阳能电池的生产商来说,这是一项巨大的成本收益,有可能推动生产过程发生巨变。”The solar market is currently dominated by panels made with silicon. In a bid to make solar more competitive, there is growing interest from companies like First Solar in developing solar cells using cadmium telluride, which is more efficient and more flexible so it could be applied many more surfaces including windows.由硅制成的面板目前在太阳能市场占据着主导地位。为了提升太阳能的竞争力,诸如第一太阳能公司(First Solar)这类企业对开发碲化镉制成的太阳能电池越来越感兴趣。这种材质更有效率,更加灵活,可应用于包括窗户在内的更多表面。To make these cadmium telluride cells, a thin layer of cadmium chloride is applied to the solar cell, and then heated up in a furnace. This is considered the activation process, Major said, helping boost a cell’s efficiency from around 1 percent to as much as 20 percent.生产碲化镉电池需要给太阳能电池添加一层薄薄的氯化镉,然后在炉中加热。梅杰说,这个环节被视为激活过程,可以有效推动电池的效率从大约1%提高到20%。In a bid to find a safer alternative, Major and his team first looked at sodium chloride, but found the efficiency was about half of cadmium chloride. Another option was difluorochloromethane but that has been linked to ozone depletion and its use has been restricted by international agreements.寻找更安全的替代材料时,梅杰和他的团队最初考虑的是氯化钠,但他们发现它的效率大约只有氯化镉的一半。另一种选择是氯二氟甲烷,但它跟臭氧层枯竭有关,已被国际协议限制使用。They then turned to magnesium chloride and found that it was just as efficient was comparable and could be applied without any expensive safety equipment.然后,他们转向氯化镁,发现这种物质的效率完全可以跟氯化镉相媲美,而且不需要昂贵的安全设备。Major said magnesium chloride isn’t being used at the moment, but was hopeful it “would be taken up by research and hopefully by industry once this work is publicized.”梅杰说,氯化镁目前还没有得到应用,但他希望“一旦这项研究工作获得关注,就能获得产学界的认可。”Steve Krum, the director of corporate communications for First Solar, would only say cadmium chloride remains “critical part” of its production process and that it was not a “major cost driver in our manufacturing process.”第一太阳能公司企业沟通部主任史蒂夫o克鲁姆仅仅表示,氯化镉仍然是该公司生产过程的“重要组成部分”,它并非“生产过程中主要的成本驱动因素。”In the other solar study, researchers writing in Nature Climate Change this week said concentrating solar power or CSP could supply a large fraction of the power supply in much of the world. The researchers from the Austria-based International Institute for Applied Systems Analysis simulated the construction and operation of CSP systems in four regions around the world taking into account weather, electricity demand and costs. They found that CSP in the Mediterranean region, for example, could provide 70-80% of current electricity demand, at no extra cost compared to gas-fired power plants.《自然气候变化》(Nature Climate Change)杂志本周发表的另一份太阳能研究报告显示,CSP系统可以解决世界大部分地区很大一部分电力供应。来自奥地利国际应用系统分析研究所(International Institute for Applied Systems Analysis)的研究人员模拟了CSP系统在全球四个地区的建设和运营情况,并充分考虑了天气、电力需求和成本等因素。他们发现,CSP系统可以满足地中海地区当前70-80%的电力需求,而且跟燃气电厂相比,它无需付额外费用。“In order to address climate change we need to greatly expand our use of renewable energy systems,” said IIASA researcher Fabian Wagner, who also worked on the study. “The key question, though, is how much energy renewable systems can actually deliver.”“为了应对气候变化,我们需要加大对可再生能源系统的利用,”这项研究的参与者之一、国际应用系统分析研究所研究员费边o瓦格纳说。“但关键问题是,可再生系统真正能够生产多少能源。”A huge challenge with deploying solar energy on a large scale is that the sun doesn’t shine all the time. That means that energy must be stored in some way. For photovoltaic (PV) cells, which convert sunlight directly to electricity, this is especially difficult to overcome, because electricity is difficult to store.大规模部署太阳能的一个重大挑战是,太阳并不是在所有时间都当空高照。这就意味着,能量必须要通过某种方式存储下来。对于直接将太阳光转换为电能的光伏电池来说,这是特别难以克的困难,因为电力很难储存。 /201407/308984宜城市中医医院是私立的吗

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