Carbon nanotube field electron emitters will get space testing

Carbon nanotube field electron emitters will get space testing

Nov. 14, 2013 — A pair of carbon nanotube arrays will be flying in space by the end of the year to test technology that could provide more efficient micro-propulsion for future generations of spacecraft. Part of a Cube Satellite (CubeSat) developed by the Air Force Institute of Technology (AFIT), the arrays will support what is expected to be the first-ever space-based testing of carbon nanotubes as electron emitters.

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Researchers at the Georgia Tech Research Institute (GTRI) produced the arrays using unique technology that grows bundles of vertically-aligned nanotubes embedded in silicon chips. In future versions of electrically-powered ion thrusters, electrons emitted from the carbon nanotube tips may be used to ionize a gaseous propellant such as xenon. The ionized gas would then be ejected through a nozzle to provide thrust for moving a satellite in space.

"The mission will characterize how well these field emission electron sources operate in the space environment relative to how well they work on the ground in vacuum chamber," said Jud Ready, a GTRI principal research engineer. "Launch vibrations and exposure to a space environment that includes atomic oxygen and micrometeorites could have some unusual effects on the arrays. This mission will help us evaluate whether these carbon nanotube electron emitters could be used in ion thrusters."

Existing ion thrusters rely on thermionic cathodes, which use high temperatures generated by electrical current to produce electrons. These devices require significant amounts of electricity to generate the heat, and must consume a portion of the propellant for their operation.

If the carbon nanotube arrays can be used as electron emitters, they would operate at lower temperatures with less power -- and without using the limited on-board propellant. That could allow longer mission times for satellites, or reduce the weight of the micro-propulsion systems.

The carbon nanotube arrays are part of ALICE, a CubeSat micro-satellite developed and built by the Air Force Institute of Technology at Wright-Patterson Air Force Base in Ohio. On a mission scheduled for Dec. 5 from Vandenberg Air Force Base in California, ALICE will ride into space on an Atlas V rocket being used to launch a separate and much larger payload. Just 10 by 10 by 30 centimeters in size, ALICE will be part of an array of eight CubeSats -- so named because they fit into small modular launchers attached to the main satellite.

The work could lead to improved micro-propulsion systems useful to small spacecraft, said Jonathan Black, director of the Center for Space Research and Assurance at AFIT.

"Technology like the devices being tested on ALICE is essential to our future ability to maneuver micro satellites or change their orbits," he explained. "Being able to incorporate propulsion into microsatellites like CubeSats increases mission longevity and the types of missions they can perform. Successful demonstrations of advanced technologies like those being flown on ALICE will ultimately lead to smaller, lighter and more energy-efficient propulsion, resulting in decreased launch costs while increasing the performance of all satellites using electric propulsion."

Utilizing a multi-departmental team, AFIT engineers in the Electrical Engineering Department developed a payload to directly expose the carbon nanotube arrays to the space environment while protecting an identical control array within the satellite. The arrays, which are approximately one centimeter square, will be switched on and off and their behavior studied. The payload experiment utilizes a sensor device known as the Integrated Miniaturized Electromagnetic Analyzer (iMESA), designed by engineers at the U.S. Air Force Academy (USAFA). The data collected from the satellite will be downloaded and processed at AFIT by students and technicians in the Department of Aeronautics and Astronautics.

The carbon nanotube arrays are excellent conductors and their geometry makes them ideal electron emitters.

"We use carbon nanotubes because they have a high aspect ratio and provide a nanoscale point that emits the electrons," said Graham Sanborn, who worked on the project as part of his Ph.D. thesis in Georgia Tech's School of Materials Science and Engineering. "The electric field focuses on the tip so we are able to get electron emission at lower voltages than might be required for other materials."

GTRI uses a series of deposition and etching steps to fabricate the arrays in clean rooms at Georgia Tech. Each one-centimeter square array contains as many as 50,000 nanotube bundles, and each bundle is grown from a five-micron pit etched into the silicon.

"The design has specific geometry to prevent electrical shorting between electrodes that are very close together," explained Sanborn.

Spacecraft are launched using chemical rockets that provide large amounts of thrust. Once in orbit, however, the vehicles can use electrically-powered thrusters to change orbits or make other maneuvers.

"Ion thrusters provide very low amounts of thrust," Sanborn said. "They are just pushing out gas molecules, but they operate very efficiently. Ion thrusters can operate for thousands of hours at a time. Cumulatively, you can achieve a significant velocity change."

The ALICE acronym is composed of several other acronyms. The "A" represents AFIT, while the "L" is for LEO -- the low Earth orbit where the satellite will operate. The "I" represents the iMESA system; the "C" is for the carbon nanotubes, while the "E" represents "Experiment."

The satellite, the first for AFIT, was designed, tested and integrated by a multi-departmental team of professors, students and technicians. The partnership with GTRI and USAFA provided students in each institution an opportunity to participate in ground-breaking research with the potential to impact numerous future satellites employing electric propulsion.

Other potential applications for Georgia Tech's CNT-based electron emitters include displays, electrodynamic tethers, vacuum electronics and traveling wave tubes.

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Viewpoints Engineering graduates must get market savvy

Viewpoints Engineering graduates must get market savvy

2013/11/15

David Wicks managing director at European Recruitment

Graduates need to learn how to sell themselves, writes David Wicks, managing director at European Recruitment in his latest viewpoint on the technology recruitment sector 

In my last column I argued that businesses should hire graduates and not simply poach talent with 2-5 years experience. This week I balance this argument with my assessment of the graduate market.

On a recent visit, one of my clients (graphics world leader) illustrated an example that highlights the difficulty in hiring graduates. The graduate interviewed possessed a superb 1st class Engineering BSc from a top university, but an hour into the interview, there was no evidence of passion or engagement with his degree, and he certainly didn’t come across as someone worth investing in.

Just as my client was kicking him out the door, he made a final effort to find out something interesting that he’d done, disregarding his CV. The grad thought for a moment and said “I guess, in my spare time, I made a 3D printer…”.

Turns out this graduate had made the whole thing from scratch including all the hardware and software. He was hired on the spot.

This story is one example of the naivety of graduates and their ability to sell themselves. As recruiters we still experience this with experienced mid to senior level professionals. How many companies miss out on excellent hires, graduate or otherwise, because of this?

Do universities need to be preparing STEM (science, technology, engineering and mathematics) graduates much better with other pragmatic skills that will help them navigate the job market? If not, whose job is this?

Could it simply be a numbers game? Apparently we are not producing many engineering grads in the first place.

When researching this article I came across the following written only last week by James Dyson, inventor and founder of the Dyson company: “…it’s hardly a surprise when Britain produces only 12,000 graduate engineers from its universities each year – France produces nearly four times that number…the French value their engineers… As a result there is a generation of young French students, gagging to study engineering at university.”

Dyson goes on to say: “They should remove the immigration cap for the brightest and best, and make a special science and engineering visa. The problem is that we are fast approaching a point where 80% of postgraduate engineering positions at British universities are taken by students from outside the UK.”

And Dyson adds: “Our peculiar visa system means that these bright engineers and scientists, given a world class education in our universities, can’t stay here when they finish their studies. We are training them up, only to send them packing – to compete with us. It’s madness.”

It speaks for itself, particularly when businesses are not as engaged with universities in the UK to iron out these business, communication and emotional intelligence deficiencies early on. This would then increase the overall value of a STEM graduate.

I’d recommend to the government that the Oxbridge and Russell Group STEM departments need to be expanded dramatically to allow more students to enter these vigorous programmes – even if this is to the detriment of the 50th to 109th ranked Universities, so that the overall cost and risk is brought down in these subjects.

To get the applicants, a hearts and minds campaign to educate UK society into the value of STEM would also really help. The visa situation is such an easy win, I’m not sure even the most anti-immigration voter could argue against post-graduate experts being of value to the country.

If we can bring up the number and quality of graduates and instil in them the value of marketing themselves then perhaps businesses will be more willing to hire those straight out of university. Graduates have a lot to offer, even if they themselves sometimes don’t realise it.

David Wicks, Managing Director at European Recruitment

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Large graphene crystals with exceptional electrical properties created

Large graphene crystals with exceptional electrical properties created

The team used surface oxygen to grow centimeter-size single graphene crystals on copper. The crystals were about 10,000 times as large as the largest crystals from only four years ago. Very large single crystals have exceptional electrical properties.

"The game we play is that we want nucleation (the growth of tiny 'crystal seeds') to occur, but we also want to harness and control how many of these tiny nuclei there are, and which will grow larger," said Rodney S. Ruoff, professor in the Cockrell School of Engineering. "Oxygen at the right surface concentration means only a few nuclei grow, and winners can grow into very large crystals."

The team -- led by postdoctoral fellow Yufeng Hao and Ruoff of the Department of Mechanical Engineering and the Materials Science and Engineering Program, along with Luigi Colombo, a material scientist with Texas Instruments -- worked for three years on the graphene growth method. The team's paper, "The Role of Surface Oxygen in the Growth of Large Single-Crystal Graphene on Copper," is featured on the cover of the Nov. 8, 2013, issue of Science.

One of the world's strongest materials, graphene is flexible and has high electrical and thermal conductivity that makes it a promising material for flexible electronics, solar cells, batteries and high-speed transistors. The team's understanding of how graphene growth is influenced by differing amounts of surface oxygen is a major step toward improved high-quality graphene films at industrial scale.

The team's method "is a fundamental breakthrough, which will lead to growth of high-quality and large area graphene film," said Sanjay Banerjee, who heads the Cockrell School's South West Academy of Nanoelectronics (SWAN). "By increasing the single-crystal domain sizes, the electronic transport properties will be dramatically improved and lead to new applications in flexible electronics."

Graphene has always been grown in a polycrystalline form, that is, it is composed of many crystals that are joined together with irregular chemical bonding at the boundaries between crystals ("grain boundaries"), something like a patch-work quilt. Large single-crystal graphene is of great interest because the grain boundaries in polycrystalline material have defects, and eliminating such defects makes for a better material.

By controlling the concentration of surface oxygen, the researchers could increase the crystal size from a millimeter to a centimeter. Rather than hexagon-shaped and smaller crystals, the addition of the right amount of surface oxygen produced much larger single crystals with multibranched edges, similar to a snowflake.

"In the long run it might be possible to achieve meter-length single crystals," Ruoff said. "This has been possible with other materials, such as silicon and quartz. Even a centimeter crystal size -- if the grain boundaries are not too defective -- is extremely significant."

"We can start to think of this material's potential use in airplanes and in other structural applications -- if it proves to be exceptionally strong at length scales like parts of an airplane wing, and so on," he said.

Another major finding by the team was that the "carrier mobility" of electrons (how fast the electrons move) in graphene films grown in the presence of surface oxygen is exceptionally high. This is important because the speed at which the charge carriers move is important for many electronic devices -- the higher the speed, the faster the device can perform.

Yufeng Hao says he thinks the knowledge gained in this study could prove useful to industry.

"The high quality of the graphene grown by our method will likely be developed further by industry, and that will eventually allow devices to be faster and more efficient," Hao said.

Single-crystal films can also be used for the evaluation and development of new types of devices that call for a larger scale than could be achieved before, added Colombo.

"At this time, there are no other reported techniques that can provide high quality transferrable films," Colombo said. "The material we were able to grow will be much more uniform in its properties than a polycrystalline film."

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Spintronics: Nano magnets arise at 2-D boundaries

Spintronics: Nano magnets arise at 2-D boundaries

Nov. 14, 2013 — When you squeeze atoms, you don't get atom juice. You get magnets.

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According to a new theory by Rice University scientists, imperfections in certain two-dimensional materials create the conditions by which nanoscale magnetic fields arise.

Calculations by the lab of Rice theoretical physicist Boris Yakobson show these imperfections, called grain boundaries, in two-dimensional semiconducting materials known as dichalcogenides can be magnetic. This may lead to new strategies for the growing field of spintronics, which takes advantage of the intrinsic spin of electrons and their associated magnetic fields for electronic and computing devices.

The discovery by Yakobson, lead author Zhuhua Zhang and their colleagues was reported online this week in the American Chemical Society journal ACS Nano.

Dichalcogenides are hybrids that combine transition metal and chalcogen atoms, which include sulfur, selenium and tellurium. The Yakobson group focused on semiconducting molybdenum disulfide (MDS) that, like atom-thick graphene, can be grown via chemical vapor deposition (CVD), among other methods. In a CVD furnace, atoms arrange themselves around a catalyst seed into familiar hexagonal patterns; however, in the case of MDS, sulfur atoms in the lattice alternately float above and below the layer of molybdenum.

When two growing blooms meet, they're highly unlikely to line up, so the atoms find a way to connect along the border, or grain boundary. Instead of regular hexagons, the atoms are forced to find equilibrium by forming adjoining rings known as dislocations, with either five-plus-seven nodes or four-plus-eight nodes.

In graphene, which is generally considered the strongest material on Earth, these dislocations are weak points. But in MDS or other dichalcogenides, they have unique properties.

"It doesn't matter how you grow them," Yakobson said. "These misoriented areas eventually collide, and that's where you find topological defects. It turns out that -- and I like this mechanistic metaphor -- they squeeze magnetism out of nonmagnetic material."

In previous work, Yakobson found dislocations create atom-width conducting lines and dreidel-shaped polyhedra in MDS. This time, the team dug deeper to find that dislocation cores turn magnetic where they force spinning electrons to align in ways that don't cancel each other out, as they do in a flawless lattice. The strength of the magnets depends on the angle of the boundary and rises with the number of dislocations necessary to keep the material energetically stable.

"Every electron has charge and spin, both of which can carry information," Zhang said. "But in conventional transistors, we only exploit the charge, as in field-effect transistors. For newly emerged spintronic devices, we need to control both charge and spin for enhanced efficiency and enriched functions."

"Our work suggests a new degree of freedom -- a new controlling knob -- for electronics that use MDS," Yakobson said. "The ability to control the magnetic properties of this 2-D material makes it superior to graphene in certain respects."

He said the dislocation rings of four and eight atoms are not energetically favored in graphene and unlikely to occur there. But in the materials that mix two elements, certain grain boundary configurations will very likely create conditions where similar elements, wishing to avoid contact with each other, will instead bond with their chemical opposites.

"The system avoids mono-elemental bonds," Yakobson said. "The chemistry doesn't like it, so four-eight offers a benefit." Those defects are also the strongest sources of magnetism at certain grain boundary angles, he said; at some angles, the boundaries become ferromagnetic.

The team proved its theory through computer models designed to isolate and control the effects of the nanoribbons' edges and grain boundary dipoles that could skew the results. They also determined that grain boundary angles between 13 and 32 degrees force a progressive overlap between the dislocations' spins. With sufficient overlap, the spins become magnetically coupled and broaden into electronic bands that support spin-polarized charge transport along the boundary.

Now, Yakobson said, "The challenge is to find a way to experimentally detect these things. It's quite difficult to resolve it at this spatial resolution, especially when some of the experimental methods, like electron beams, would destroy the material."

Co-authors of the paper are Rice postdoctoral researcher Xiaolong Zou and Vincent Crespi, distinguished professor of physics, materials science and engineering, and chemistry at The Pennsylvania State University. Yakobson is Rice's Karl F. Hasselmann Professor of Mechanical Engineering and Materials Science, a professor of chemistry and a member of the Richard E. Smalley Institute for Nanoscale Science and Technology.

A U.S. Army Research Office Multidiscipline University Research Initiative grant, the National Science Foundation and the Robert Welch Foundation supported the research. Computations were performed on the Data Analysis and Visualization Cyberinfrastructure supercomputer administered by Rice's Ken Kennedy Institute for Information Technology.

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New hologram technology created with tiny nanoantennas

New hologram technology created with tiny nanoantennas

The metasurface, thousands of V-shaped nanoantennas formed into an ultrathin gold foil, could make possible "planar photonics" devices and optical switches small enough to be integrated into computer chips for information processing, sensing and telecommunications, said Alexander Kildishev, associate research professor of electrical and computer engineering at Purdue University.

Laser light shines through the nanoantennas, creating the hologram 10 microns above the metasurface. To demonstrate the technology, researchers created a hologram of the word PURDUE smaller than 100 microns wide, or roughly the width of a human hair.

"If we can shape characters, we can shape different types of light beams for sensing or recording, or, for example, pixels for 3-D displays. Another potential application is the transmission and processing of data inside chips for information technology," Kildishev said. "The smallest features -- the strokes of the letters -- displayed in our experiment are only 1 micron wide. This is a quite remarkable spatial resolution."

Findings are detailed in a research paper appearing on Friday (Nov. 15) in the journal Nature Communications.

Metasurfaces could make it possible to use single photons -- the particles that make up light -- for switching and routing in future computers. While using photons would dramatically speed up computers and telecommunications, conventional photonic devices cannot be miniaturized because the wavelength of light is too large to fit in tiny components needed for integrated circuits.

Nanostructured metamaterials, however, are making it possible to reduce the wavelength of light, allowing the creation of new types of nanophotonic devices, said Vladimir M. Shalaev, scientific director of nanophotonics at Purdue's Birck Nanotechnology Center and a distinguished professor of electrical and computer engineering.

"The most important thing is that we can do this with a very thin layer, only 30 nanometers, and this is unprecedented," Shalaev said. "This means you can start to embed it in electronics, to marry it with electronics."

The layer is about 1/23rd the width of the wavelength of light used to create the holograms.

The Nature Communications article was co-authored by former Purdue doctoral student Xingjie Ni, who is now a postdoctoral researcher at the University of California, Berkeley; Kildishev; and Shalaev.

Under development for about 15 years, metamaterials owe their unusual potential to precision design on the scale of nanometers. Optical nanophotonic circuits might harness clouds of electrons called "surface plasmons" to manipulate and control the routing of light in devices too tiny for conventional lasers.

The researchers have shown how to control the intensity and phase, or timing, of laser light as it passes through the nanoantennas. Each antenna has its own "phase delay" -- how much light is slowed as it passes through the structure. Controlling the intensity and phase is essential for creating working devices and can be achieved by altering the V-shaped antennas.

The work is partially supported by U.S. Air Force Office of Scientific Research, Army research Office, and the National Science Foundation. Purdue has filed a provisional patent application on the concept.

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微软着手解决OS碎片化问题

微软着手解决OS碎片化问题

　　微软的操作系统很多，在移动设备上就有Windows-Phone、Windows-RT、Windows Pro三种，第三方开发者和消费者无法准确辨明这三种操作系统，由此导致了碎片化问题。

　　为此，微软于11月6日宣布将着手处理被第三方开发者所诟病的操作系统碎片化的问题，主要的处理办法就是合并手机操作系统和电脑操作系统。

　　第一步：微软合并了手机操作系统Windows Phone和电脑操作系统Windows两个操作系统的开发者平台和计划。

　　第二步：微软整合了两个操作系统的市场营销团队，减少内耗。

　　此外，微软还降低了针对电脑和移动设备的开发者注册费。已经在“Windows商店”上注册了的开发人员可以直接上传Windows Phone软件，无须其他额外费用。此外，微软还将给现有已经注册的Windows和Windows Phone开发者，提供一个可以将注册期限免费延长一年的代码。

香港南芳实业有限公司(深圳南芳引航科技有限公司)成立于2001年。是一家专业开发、生产、加工、销售各种应用于计算机接口设备连接线、手机数据线、车载电子设备、医疗器械等高科技电子设备之连接线的外商独资企业。

主要产品为：

线材系列： DC电源线、USB连接线、转接线材、HDMI线、RCA音视频连接线、MHL连接线、HDMI高清数据线、USB数据线、MHL 手机数据线材、RCA音频视频线、三星S3 S4转接及数据线、DVI连接线、DB连接线、MINI DIN连接线、弹弓线

连接器系列：Mini USB接口连接器、HDMI接口连接器、手机连接器、USB接口连接器、DIN接口连接器、DIN连接器、Mini USB连接器、HDMI连接器

热敏电阻系列：高耐热性热敏电阻、贴片热敏电阻、热敏电阻传感器、高精度热敏电阻、高耐热性电阻

红外线感应器系列：非接触红外传感器、热电堆

二极管系列

烤线加工等相关线材组立加工。已通过ISO-9001:2008质量管理体系认证和ISO-14001:2004 环境管理体系认证。直接海外美金付款同时可开具17％的增值税发票和提供转厂合同，满足广大客户的需求。

:公座90 阻尼二极管ru3a的代换 ps3 hdmi vga 电源线 步双极 笔记本电脑hdmi线 qvod 成快播人电影u88 rohm二极管 来电转接怎么收费 mhl led 暖光与白光哪个好 重力传感器原理 ps3 hdmi接口 压电传感器的影响因素 18b20 温度传感器 外扣型 scart usb 电力供应不足 hdmi 1.4版本的显卡 mp3音频连接器

澜起科技第三季度营收达3010万美元

澜起科技第三季度营收达3010万美元

　　澜起科技是一家全球领先的模拟与混合信号芯片供应商，今年9月底已经在美国纳斯达克成功上市。上市之后，澜起科技一直表现优异，这一点从澜起科技第三季度财报上可以得到印证。

　　昨日晚间，澜起科技发布了第三季度财报，报告显示：第三季度澜起科技营业收入达到3010万美元，与2012年同期相比增长了45.9%，环比增长18.8&，增长十分迅速。由于澜起科技在美国上市，按照美国通用会计准则，净利润更是达到了950万美元。

　　具体来看，澜起科技第三季度毛利润为1910万美元，毛利率为63.7%；运营利润860万美元，运营利润率达到28.8%。

　　澜起科技自从在美国上市以来，市场反响普遍较好，营收持续增长，预计第四财季营收能达到3200万美元至3400万美元。

香港南芳实业有限公司(深圳南芳引航科技有限公司)成立于2001年。是一家专业开发、生产、加工、销售各种应用于计算机接口设备连接线、手机数据线、车载电子设备、医疗器械等高科技电子设备之连接线的外商独资企业。

主要产品为：

线材系列： DC电源线、USB连接线、转接线材、HDMI线、RCA音视频连接线、MHL连接线、HDMI高清数据线、USB数据线、MHL 手机数据线材、RCA音频视频线、三星S3 S4转接及数据线、DVI连接线、DB连接线、MINI DIN连接线、弹弓线

连接器系列：Mini USB接口连接器、HDMI接口连接器、手机连接器、USB接口连接器、DIN接口连接器、DIN连接器、Mini USB连接器、HDMI连接器

热敏电阻系列：高耐热性热敏电阻、贴片热敏电阻、热敏电阻传感器、高精度热敏电阻、高耐热性电阻

红外线感应器系列：非接触红外传感器、热电堆

二极管系列

烤线加工等相关线材组立加工。已通过ISO-9001:2008质量管理体系认证和ISO-14001:2004 环境管理体系认证。直接海外美金付款同时可开具17％的增值税发票和提供转厂合同，满足广大客户的需求。

:独立显卡hdmi音频 连接器行业发展 手机连接投影仪的数据线 红外光纤测温传感器 台式机如何连接投影仪 红外线传感器原理 苹果手机电源线 红外线探测仪 固态硬盘转接线 amphenol连接器 投影手机有哪些 什么是红外线传感器 手机usb连接 三同轴 连接器 安装 lm317 恒流源电阻 电脑电源线与什么通用 测量传感器 hdmi线多长 西门子传感器大全 线束检验标准

联发科明年或投资10亿亿美元开发新产品

联发科明年或投资10亿亿美元开发新产品

　　业界消息称，在智能机、平板电脑、电视、无线设备、DVD等设备方面，联发科很有可能会投资逾10亿美元来在以上设备上开发20款以上的新芯片组的解决方案。

　　联发科今年的营收预期在新台币1300亿元，而联发科一般将其年度营收的20%作为研发支出，所以今年该公司的研发支出大约在新台币260亿元。由于联发科明年的营收预期将增长15%至25%，达到新台币1495亿元至1625亿元，所以该公司明年的研发支出可能将超过新台币300亿元(约合10.2亿美元)。

　　联发科预计将在2014年针对智能机发布至少6款新处理器，其中包含2款8核处理器、2款4核处理器、1款双核处理器、1款单核处理器。消息称，联发科明年还将为高端、中端、低端平板电脑推出6款以上新处理器。

香港南芳实业有限公司(深圳南芳引航科技有限公司)成立于2001年。是一家专业开发、生产、加工、销售各种应用于计算机接口设备连接线、手机数据线、车载电子设备、医疗器械等高科技电子设备之连接线的外商独资企业。

主要产品为：

线材系列： DC电源线、USB连接线、转接线材、HDMI线、RCA音视频连接线、MHL连接线、HDMI高清数据线、USB数据线、MHL 手机数据线材、RCA音频视频线、三星S3 S4转接及数据线、DVI连接线、DB连接线、MINI DIN连接线、弹弓线

连接器系列：Mini USB接口连接器、HDMI接口连接器、手机连接器、USB接口连接器、DIN接口连接器、DIN连接器、Mini USB连接器、HDMI连接器

热敏电阻系列：高耐热性热敏电阻、贴片热敏电阻、热敏电阻传感器、高精度热敏电阻、高耐热性电阻

红外线感应器系列：非接触红外传感器、热电堆

二极管系列

烤线加工等相关线材组立加工。已通过ISO-9001:2008质量管理体系认证和ISO-14001:2004 环境管理体系认证。直接海外美金付款同时可开具17％的增值税发票和提供转厂合同，满足广大客户的需求。

:混频器在哪里 in4007二极管 防反接 氧气快速接头 压电传感器 SUB电子连接器 无线投影仪安装 hdmi 1.3 3d 索尼电视hdmi连接电脑 多口usb接口 手机电池连接器 超短焦投影仪 diy matlab fir滤波器设计 汽车传感器厂家 什么是光纤传感器 硬盘转usb的转接线 10款hdmi线缆深度剖析 夏普投影仪灯泡价格 激光测距传感器 选型 二极管测试仪器 二极管工厂

联想第二财季营收逼近百亿美元

联想第二财季营收逼近百亿美元

　　　　今天中午，联想集团公布了2014财年第二季的财报。根据公布的数据，联想在第二财季的营业收入逼近百亿美元，达到了97.7亿美元，与2012年同期相比增长了近12.7%。归属普通股东的净利润更是增长了31.4%，达到了2.14亿美元。

　　第二财季，亚太区仍是联想营业收入的主力阵营，营业收入最高，达到了53亿美元，占比55%。其中，中国区的营业收入为38亿美元，占亚太区收入的71.7%，占全球收入的40%。

　　值得一提的是，在亚太区，联想个人电脑的市场份额达到了48.4%，智能手机和平板电脑的销量已经超过了100万台。尤其是在中国，智能手机的销量同比增长了64%。

　　联想集团第二财季在欧洲、中东和非洲地区的收入居于次位，达到了23亿美元，占比23%。在美洲地区的营业收入达到了22亿美元，占比22%。联想的个人电脑在这些地区的市场份额均有不同幅度的上涨。

　　目前市场上对于个人电脑的需求一直处于低迷状态，整个行业的发货量下降了7.6%。在这样的全球背景下，联想的个人电脑销量却逆势上涨，连续两个季度全球排名第一，可见联想集团的上涨势头很是强劲。加上这个月月初刚刚发布了一款Yoga平板电脑，联想集团在未来的竞争中还有进一步上升的发展空间。

香港南芳实业有限公司(深圳南芳引航科技有限公司)成立于2001年。是一家专业开发、生产、加工、销售各种应用于计算机接口设备连接线、手机数据线、车载电子设备、医疗器械等高科技电子设备之连接线的外商独资企业。

主要产品为：

线材系列： DC电源线、USB连接线、转接线材、HDMI线、RCA音视频连接线、MHL连接线、HDMI高清数据线、USB数据线、MHL 手机数据线材、RCA音频视频线、三星S3 S4转接及数据线、DVI连接线、DB连接线、MINI DIN连接线、弹弓线

连接器系列：Mini USB接口连接器、HDMI接口连接器、手机连接器、USB接口连接器、DIN接口连接器、DIN连接器、Mini USB连接器、HDMI连接器

热敏电阻系列：高耐热性热敏电阻、贴片热敏电阻、热敏电阻传感器、高精度热敏电阻、高耐热性电阻

红外线感应器系列：非接触红外传感器、热电堆

二极管系列

烤线加工等相关线材组立加工。已通过ISO-9001:2008质量管理体系认证和ISO-14001:2004 环境管理体系认证。直接海外美金付款同时可开具17％的增值税发票和提供转厂合同，满足广大客户的需求。

:冰箱温控器 安装 图 电阻规管 iec61850 投影仪发展趋势 omega热敏电阻 电力连接线夹 发光二极管支架 磁致伸缩传感器 缺点 热敏电阻应用 线阵热电堆 gpd系列光杆排线器 功放哪个牌子好 SD 漫反射式光电传感器 rohm代理商 mic男团演唱会 机油压力传感器型号 光电测速传感器 defy底包 妖狐x仆ss14

飞思卡尔公开其QorIQ T2080处理器样品

飞思卡尔公开其QorIQ T2080处理器样品

　　飞思卡尔半导体日前已开始提供其QorIQ T2080处理器样品，并已于近日举行的中国深圳风河开发者大会上首次公开演示该器件。

　　T2080通信处理器具有最佳的性能和功效，专为控制平面或集成控制平面和数据平面处理而设计，目标应用包括移动回程设备、LTE/WCDMA通道卡、网络交换和路由、控制卡、智能网卡及军用与航空产品。

　　T2080包括8个虚拟内核，旨在为采用飞思卡尔QorIQ P5040、P4080和P3041处理器进行设计的现有用户节约成本并提升性能。T2080属于飞思卡尔28纳米QorIQ处理平台，该平台还包括T4240和T1040处理器及QorIQ Qonverge B4860器件。

　　由于采用了高效、双线程e6500 Power Architecture内核，T2080具有出色的性能，该内核首次采用在28纳米旗舰QorIQ T4240通信处理器中。e6500内核的双线程技术提供的性能是单线程e6500内核的1.7倍。它提供最高1.8 GHz性能，同时保持较短的7级管路，实现对不可预测的控制面板代码分支的最佳延迟响应。此外，e6500内核还采用AltiVec技术，用于128位单指令多数据矢量处理器，可进行DSP处理的计算，如信号处理加速和雷达处理等，但功耗更低。

　　供货

　　T2080现在可以为早期使用的客户提供样品，一般样品计划2014年第1季度提供。

香港南芳实业有限公司(深圳南芳引航科技有限公司)成立于2001年。是一家专业开发、生产、加工、销售各种应用于计算机接口设备连接线、手机数据线、车载电子设备、医疗器械等高科技电子设备之连接线的外商独资企业。

主要产品为：

线材系列： DC电源线、USB连接线、转接线材、HDMI线、RCA音视频连接线、MHL连接线、HDMI高清数据线、USB数据线、MHL 手机数据线材、RCA音频视频线、三星S3 S4转接及数据线、DVI连接线、DB连接线、MINI DIN连接线、弹弓线

连接器系列：Mini USB接口连接器、HDMI接口连接器、手机连接器、USB接口连接器、DIN接口连接器、DIN连接器、Mini USB连接器、HDMI连接器

热敏电阻系列：高耐热性热敏电阻、贴片热敏电阻、热敏电阻传感器、高精度热敏电阻、高耐热性电阻

红外线感应器系列：非接触红外传感器、热电堆

二极管系列

烤线加工等相关线材组立加工。已通过ISO-9001:2008质量管理体系认证和ISO-14001:2004 环境管理体系认证。直接海外美金付款同时可开具17％的增值税发票和提供转厂合同，满足广大客户的需求。

:主机电源线怎么插 tvs瞬态二极管 USBת2 稳压二极管测量耐压 圆形连接器usb口 东莞数据线生产厂家 检测到可能的堆损坏 怪物猎人p3太刀混装 hdmi和vga哪个好 hdmi转换dvi 索尼投影仪驱动 in4007二极管的作用 掌上投影仪 免费vpn连接器 苹果5数据线真假 din型连接器 USB连接器厂商 TO eh hentai 720p投影仪选购

施振荣能够再次复兴宏碁吗？

施振荣能够再次复兴宏碁吗？

　　从1976年至今，创立37年的宏碁再次走到了一个十字路口。

　　11月5日晚间，宏碁发布2013年第三季度财报，显示公司在季度内大幅亏损新台币131亿元(约合4.4亿美元)。同时，宏碁董事长王振堂宣布将在明年1月卸任CEO职位，由现任总裁翁建仁接任。

　　突然而来的业绩巨亏和人事变动震惊了投资者。昨天台湾股市开盘后，宏碁股价即跌停在16.9元新台币。过去两年，宏碁接连出现了亏损，投资者一直在观望这家PC厂商的前景。最新一个季度的业绩，估计浇灭了他们最后的一丝希望。

　　据悉，为了扭转颓势，宏碁成立了一个变革委员会，并由宏碁创始人施振荣领导。这个委员会希望通过裁员和发行新股融资，再造宏碁。

　　从高峰到低谷

　　从高峰滑落到低谷，宏碁实际上只用了2年时间。在PC市场光景好的2007到2010年间，宏碁通过并购一举把自己送上了全球第二大PC厂商的位置上，但是也正因为并购，成为了现在宏碁扭亏的包袱。

　　2007到2010年间，宏碁通过并购连续拿下美国第四大PC品牌Gateway、欧洲电脑厂商Packard Bell、廉价PC品牌eMachine和方正电脑，采取“多品牌策略”，押注上网本，让宏碁的市场份额一度达到21.2%，与当年的第一名惠普的市场份额只差0.2个百分点。

　　但是好景不长，随着苹果公司陆续推出iPhone智能手机、iPad平板电脑，在全球掀起了一股移动终端浪潮，PC市场受到挑战，宏碁则首当其冲。

　　2011年，受到平板电脑冲击、前CEO兰奇闪电离职影响，宏碁全年亏损66亿元新台币(约合2.23亿美元)。2012年，宏碁严格控制成本，在前三个季度里都实现了盈利，但随后第四季度提列无形资产损失，让实现扭亏的希望最终功亏一篑。2013年第一季度，宏碁实现盈利，但是第二季度和第三季度却又出现了亏损。

　　当年PC行业红火时，宏碁的并购能够带来规模效应，但是当这个行业出现下滑时，这些并购而来的资产似乎开始霉变，成为一种有毒资产，不断困扰着宏碁，并拖着宏碁不断滑落到低谷。

　　变革与挑战

　　那么，宏碁该如何破局呢？宏碁CEO王振堂提出了“打销、重整、变革”六字方针。所谓“打消”是指，对无形资产完成一次性减计；“重整”是指重新优化团队，全球裁员7%，每年节省1亿美元的费用；“变革”则是，必须有抓住新的商业模式、服务、附加价值。这些措施简单而言，就是开源节流，但是要想找到增长点，对宏碁来说则非常困难。

　　目前，宏碁主营业务仍然是PC，这个市场走下坡路已经成为不争的事实，要想在这个领域再次获得增长几乎没有可能。按照现有的市场状况，宏碁似乎只能在智能手机、平板电脑业务或者其他业务上发力。

　　实际上，宏碁原本可以尽早降低对PC业务的依赖，但王振堂的错误判断确实“耽误”了宏碁。

　　2011年，兰奇闪电离职，据说是因为他与王振堂在宏碁未来的发展策略上存在分歧。兰奇主张在智能手机和平板电脑领域加大投入，但王振堂则认为这样可能会伤害到宏碁的根基，坚持大力投资PC业务。

　　现在，外界则把期望放在了施振荣身上，希望他第三次再造宏碁。

　　施振荣创立了宏碁，并两次再造宏碁，使其发展至今。在对宏碁的两次改造中，施振荣一次将宏碁业务简化为品牌和制造业务；另外一次，则是让宏碁专注做品牌，两次的策略都促进了宏碁的快速发展。

　　施振荣昨天在一封公开信中说，变革是企业永续经营的常态，未来他将以之前二度推动宏碁再造的经验来提供意见，希望让未来的组织再度建立起“新宏碁文化”的基因，并且能一代一代传承下去。

　　值得注意的是，前两次宏碁再造的大背景是：公司内部策略有问题或者总体经济不够景气，但这次面对的却是PC产业结构性转型。施振荣能够再次复兴宏碁吗？答案可能不容乐观。

香港南芳实业有限公司(深圳南芳引航科技有限公司)成立于2001年。是一家专业开发、生产、加工、销售各种应用于计算机接口设备连接线、手机数据线、车载电子设备、医疗器械等高科技电子设备之连接线的外商独资企业。

主要产品为：

线材系列： DC电源线、USB连接线、转接线材、HDMI线、RCA音视频连接线、MHL连接线、HDMI高清数据线、USB数据线、MHL 手机数据线材、RCA音频视频线、三星S3 S4转接及数据线、DVI连接线、DB连接线、MINI DIN连接线、弹弓线

连接器系列：Mini USB接口连接器、HDMI接口连接器、手机连接器、USB接口连接器、DIN接口连接器、DIN连接器、Mini USB连接器、HDMI连接器

热敏电阻系列：高耐热性热敏电阻、贴片热敏电阻、热敏电阻传感器、高精度热敏电阻、高耐热性电阻

红外线感应器系列：非接触红外传感器、热电堆

二极管系列

烤线加工等相关线材组立加工。已通过ISO-9001:2008质量管理体系认证和ISO-14001:2004 环境管理体系认证。直接海外美金付款同时可开具17％的增值税发票和提供转厂合同，满足广大客户的需求。

:mhl 2.0 连接器厂商 hdmi高清线制作 广清连接线 180度USB 红外发光二极管检测 虚拟专用网络连接器 投影仪 技术参数 音频转接 热电偶原理 风速传感器原理 投影仪安装 高精度线性霍尔传感器 mhl转vga minidin连接器 磁电转速传感器 古代顶针 tvs二极管怎么分方向 L=14 嘉腾精密投影仪

iPad air最低成本274美元

iPad air最低成本274美元

　　新的苹果平板电脑iPad air已经与11月1日正式上市，上市以来一直受到了媒体和消费者关注的对象。

　　对于这款采用了苹果A7处理器，并搭配M7协处理器，500万后置iSight 摄像头，最高分辨率为2048x1536（264ppi），CPU和GPU的处理能力高出上一代平板电脑2倍的新型高配平板电脑。消费者对于它的成本价很是好奇。

　　根据IHS iSuppli的调研报告显示，iPad Air的最低成本为274美元。其中，16GB WiFi版iPad Air的零部件成本为274美元， 128GB Wi-Fi+LTE版的零部件成本为361美元，相比第三代苹果iPad零件成本低了大约40美元左右。

　　虽然新一代iPad air在零件上进行了升级换代，但是成本却降低了。这是由于新一代iPad air才采用了新技术，因此触控屏的成本略有下降。

　　此外，新一代iPad air的玻璃成本也比之前的A5处理器下降了18美元，4G芯片的成本也下降至32美元，RAM的成本低至10元。

　　由此，新一代的iPad air才可以在零部件更显换代的基础下降成本。由此给苹果公司带来了丰厚的利益空间。

香港南芳实业有限公司(深圳南芳引航科技有限公司)成立于2001年。是一家专业开发、生产、加工、销售各种应用于计算机接口设备连接线、手机数据线、车载电子设备、医疗器械等高科技电子设备之连接线的外商独资企业。

主要产品为：

线材系列： DC电源线、USB连接线、转接线材、HDMI线、RCA音视频连接线、MHL连接线、HDMI高清数据线、USB数据线、MHL 手机数据线材、RCA音频视频线、三星S3 S4转接及数据线、DVI连接线、DB连接线、MINI DIN连接线、弹弓线

连接器系列：Mini USB接口连接器、HDMI接口连接器、手机连接器、USB接口连接器、DIN接口连接器、DIN连接器、Mini USB连接器、HDMI连接器

热敏电阻系列：高耐热性热敏电阻、贴片热敏电阻、热敏电阻传感器、高精度热敏电阻、高耐热性电阻

红外线感应器系列：非接触红外传感器、热电堆

二极管系列

烤线加工等相关线材组立加工。已通过ISO-9001:2008质量管理体系认证和ISO-14001:2004 环境管理体系认证。直接海外美金付款同时可开具17％的增值税发票和提供转厂合同，满足广大客户的需求。

:压力变送器 微位移传感器论坛 主板usb线接法 苹果数据线 hdmi线最长几米 电阻并联计算器 hc 020k测速传感器 hdmi高清数据线 toshiba移动硬盘维修 苹果电脑连接投影仪 贝尔金官网 母座单排脚DIP型 fuji xerox官网 闸刀式电池连接器 大din连接器 电子线束 行业发展 交流接触器自锁 测试计量技术及仪器 思密达是什么意思 连接器冲压

第二代谷歌眼镜可搭耳机和太阳镜

第二代谷歌眼镜可搭耳机和太阳镜

　　　　昨日午间，科技博客GottaBeMobile曝光了第二代谷歌眼镜的组图。根据所公布的产品细节图，第二代谷歌眼镜在第一代的基础上进行了创新。

　　第一代谷歌眼镜采用的骨传导技术，这技术有一个缺陷：就是会产出回波，导致使用者听到自己的回音，由此有部分使用者会产生一些不适感。为了改善这一问题，第二代谷歌眼镜配备了一个单声道耳机，这款耳机可以直接插入到眼镜的Micro USB插口，进而改善通话质量。对骨传导技术产生不适的使用者可以选择佩带耳机，当然，第二代谷歌眼镜还是保留了骨传导技术，使用者可以自由选择是否佩带耳机。

　　此外，第二代谷歌眼镜在原来的外形基础上增加了镜框，并配送了一副可以拆卸的太阳眼镜。

　　在有眼前方还有一个成像装置，通过 这个成像装置，用户的短信、邮件、日程以及声音信号等都可以自动推送给用户。

　　在软件方面，第二代谷歌眼镜显示屏的一侧还配置了500万像素的摄像头，可以进行照片和短片的拍摄；内置的系统也进行了升级，配备的是XE10。

　　谷歌方面表示11月份将会对用户开放销售渠道，部分购买了第一代谷歌眼镜的用户可以率先实行“以旧换新”活动，并可以邀请三位好友共同购买。

香港南芳实业有限公司(深圳南芳引航科技有限公司)成立于2001年。是一家专业开发、生产、加工、销售各种应用于计算机接口设备连接线、手机数据线、车载电子设备、医疗器械等高科技电子设备之连接线的外商独资企业。

主要产品为：

线材系列： DC电源线、USB连接线、转接线材、HDMI线、RCA音视频连接线、MHL连接线、HDMI高清数据线、USB数据线、MHL 手机数据线材、RCA音频视频线、三星S3 S4转接及数据线、DVI连接线、DB连接线、MINI DIN连接线、弹弓线

连接器系列：Mini USB接口连接器、HDMI接口连接器、手机连接器、USB接口连接器、DIN接口连接器、DIN连接器、Mini USB连接器、HDMI连接器

热敏电阻系列：高耐热性热敏电阻、贴片热敏电阻、热敏电阻传感器、高精度热敏电阻、高耐热性电阻

红外线感应器系列：非接触红外传感器、热电堆

二极管系列

烤线加工等相关线材组立加工。已通过ISO-9001:2008质量管理体系认证和ISO-14001:2004 环境管理体系认证。直接海外美金付款同时可开具17％的增值税发票和提供转厂合同，满足广大客户的需求。

:发光二极管 led七彩灯 苹果手机接头 连接器插座 工业投影仪操作说明 红外光纤测温传感器 win7 hdmi 声音分开 红外线摄像头多少钱 altium 常用pcb封装库 肖特基二极管代换 saa认证标志 lu6200 miui 内置安卓系统的投影仪 狂野飙车8 iphone5 hdmi线的好坏 线性霍尔传感器的用法 如何将电视转换为hdmi 键盘usb转接线 带插头电源线 颖达电子科技有限公司 大功率整流二极管图片

Windows 8.1系统恢复盘即将开卖

Windows 8.1系统恢复盘即将开卖

Windows 8.1是微软为Windows 8发布的一次免费更新，Windows 8用户可以通过Windows Store免费下载，旧版用户需要先升级至Windows 8然后再更新至Windows 8.1。

但是微软并没有直接提供可以下载的Windows 8.1 ISO镜像，想要全新安装或是遇到未知错误想要恢复系统的用户，还要另想办法。一个好消息是，新蛋在官网放出消息，从11月15日开始，将开售Windows 8.1备份DVD(Microsoft Windows 8.1 Back-up Media，Media Only )，价格为15美元。

Windows 8.1备份DVD并不提供序列号，只是作为系统恢复盘，在安装或使用Windows 8.1出现错误时可以帮你解决问题。目前，新蛋也并没有提供关于该产品的更多详细信息，只是标明该产品是出自微软官方之手。

根据猜测，Windows 8.1备份DVD适用于Windows 8.1普通版和专业版，在恢复系统时，它会根据你输入的产品密钥来判断接下来安装哪些功能。

香港南芳实业有限公司(深圳南芳引航科技有限公司)成立于2001年。是一家专业开发、生产、加工、销售各种应用于计算机接口设备连接线、手机数据线、车载电子设备、医疗器械等高科技电子设备之连接线的外商独资企业。

主要产品为：

线材系列： DC电源线、USB连接线、转接线材、HDMI线、RCA音视频连接线、MHL连接线、HDMI高清数据线、USB数据线、MHL 手机数据线材、RCA音频视频线、三星S3 S4转接及数据线、DVI连接线、DB连接线、MINI DIN连接线、弹弓线

连接器系列：Mini USB接口连接器、HDMI接口连接器、手机连接器、USB接口连接器、DIN接口连接器、DIN连接器、Mini USB连接器、HDMI连接器

热敏电阻系列：高耐热性热敏电阻、贴片热敏电阻、热敏电阻传感器、高精度热敏电阻、高耐热性电阻

红外线感应器系列：非接触红外传感器、热电堆

二极管系列

烤线加工等相关线材组立加工。已通过ISO-9001:2008质量管理体系认证和ISO-14001:2004 环境管理体系认证。直接海外美金付款同时可开具17％的增值税发票和提供转厂合同，满足广大客户的需求。

:北京端子连接器招聘 二极管指示灯线路图 24P av接口转hdmi hdmi连接线批发 scsi 连接器 tpa s2总决赛 索尼电视机hdmi 二极管封装 汽车塑料接插件 投影仪内部 投影仪的分辨率 光敏电阻的阻值 红外对管引脚 租投影仪大概多少钱 hdmi线材厂家 高压线束检验方法 松下a5伺服 速度控制 htc g18 sensation xe bnc接头

Intel官方文档：Bay Trail完爆ARM群雄

Intel官方文档：Bay Trail完爆ARM群雄

Bay Trail我们应该都不会陌生了，它是Intel在今年9月份发布的新一代Atom处理器中的一员，主要面向平板机市场。它采用了22nm制造工艺以及全新的Silvermont架构，Intel官方表示其性能提升非常大，不信你来看幻灯片。

VR-Zone从某厂商那里拿到了一份Intel的官方文档，其中对比了Bay Trail处理器与ARM群雄的性能，其中包括Exynos S(不知为何物，难道是Exynos 5?)、高通8x74、APQ8094、Tegra 5以及Exynos 6。

在对比中，Intel以高通8x74的性能为基准，三星的Exynos S达到了8x74的1.43倍、8094则是8x74的1.21倍、Tegra 5是8x74的1.43倍、Exynos 6则是8x74的1.53倍，而Intel的Bay Trail则大杀四方，达到了8x74的2.09倍，大幅度领先于其它产品。

Intel移动端的Bay Trail四核处理器性能强劲

从性能对比我们可以看出Exynos S绝对不是Exynos 5系列，毕竟后者的性能没这么猛，也许这是三星一个新的处理器家族?Exynos 6则很有可能是三星下一代旗舰产品所采用的处理器，采用64位架构设计。

至于高通8x74则应该就是目前的骁龙800系列，8094倒是头一次听说，应该是此前曝光的8084的下一代产品，最快也要到明年下半年可能才会和我们见面。

Tegra 5已经是我们的老朋友，明年年初应该就能看到，其CPU架构还是Cortex-A15，GPU则升级到了Kepler系列，性能彪悍。

香港南芳实业有限公司(深圳南芳引航科技有限公司)成立于2001年。是一家专业开发、生产、加工、销售各种应用于计算机接口设备连接线、手机数据线、车载电子设备、医疗器械等高科技电子设备之连接线的外商独资企业。

主要产品为：

线材系列： DC电源线、USB连接线、转接线材、HDMI线、RCA音视频连接线、MHL连接线、HDMI高清数据线、USB数据线、MHL 手机数据线材、RCA音频视频线、三星S3 S4转接及数据线、DVI连接线、DB连接线、MINI DIN连接线、弹弓线

连接器系列：Mini USB接口连接器、HDMI接口连接器、手机连接器、USB接口连接器、DIN接口连接器、DIN连接器、Mini USB连接器、HDMI连接器

热敏电阻系列：高耐热性热敏电阻、贴片热敏电阻、热敏电阻传感器、高精度热敏电阻、高耐热性电阻

红外线感应器系列：非接触红外传感器、热电堆

二极管系列

烤线加工等相关线材组立加工。已通过ISO-9001:2008质量管理体系认证和ISO-14001:2004 环境管理体系认证。直接海外美金付款同时可开具17％的增值税发票和提供转厂合同，满足广大客户的需求。

:hdmi接口投影仪 防盗传感器 手机迷你投影机 usb connector ssk带电源u盘连接器 光敏电阻路灯控制电路 lg手机投影机 电磁炉热敏电阻型号 太阳能电池 二极管 国标电源线 hdmi传输器 dvi hdmi 二极管桥式整流电路 稳压二极管的接法 hdmi转vga转换器 3051压力变送器 西安电子连接器 供应电动车控制器 mems传感器概念股 电阻并联计算器