共查询到20条相似文献,搜索用时 107 毫秒
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作为国内白色家电巨头的海尔,在为这款定位于家庭的一体机进行外观设计时,也为其赋予了浓厚的白色家电味,纯白色的机身显得颇具档次,给人一种非常清爽的感觉。值得一提的是,整个机身除了白色就剩下采用璀璨水晶材质的塑料包边了,这一设计的加入配合采用白色钢琴烤漆的面板,让其整机展现出一股晶莹剔透的质感。并且,其圆润的机身边角线条,也为Q5增加了一丝可爱的味道。 相似文献
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继今年初的V8风潮,夏新又推出一款力作——PDVD-10,为它在DVD便携机领域添上了新的一笔,为我们带来了新的选择,新的乐趣。 相似文献
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缘起
最初,萨克斯管就是为管弦乐团而生的。1840年,比利时人阿道夫·萨克斯(Adolphe Sax)决定为管弦乐团制造一种低音管乐器,而这个想法,最终创造出了萨克斯管。萨克斯本人是一位乐器制造商,擅长演奏长笛和单簧管, 相似文献
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a—SiNx:H薄膜对a—Si:H TFT阈值电压的影响 总被引:4,自引:0,他引:4
介绍了测定a-Si:HTFT闽值电压的实验方法。重点研究了改变a-SiNx:H薄膜淀积时反应气体NH3/SiH4流速比以及a-SiNx:H膜厚对a-Si:HTFT阈值电压的影响。对实验结果进行了分析。实验结果表明:a-Si:HTFT的阈值电压随a-SiNx:H的膜厚增加而增大;增大X-SiNx:H薄膜淀积时NH3/SiH4气体流速比,可明显减小a-Si:HTFT的阈值电压。 相似文献
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Herger P. Niestegge G. Wallmeier E. 《Selected Areas in Communications, IEEE Journal on》1987,5(8):1309-1314
A broadband ISDN switching network model is presented, switching the channel types H2, H3, and H4 envisaged by the CCITT. The synchronous time division multiplex technique is applied. The switching network operates at the basic bit rate of the H2-channel; H3and H4-connections are established via multichannel connections of up to four basic channels. H2-connections which are part of one H3- or H4-connection always have to use common interconnection links. This is a favorable solution to keep digit sequence integrity for multichannel connections, but influences blocking characteristics of the switching network. The implementation of an optimal path selection method plays a fundamental role. In such a multichannel switching network, blocking probabilities for H2-, H3-, and H4-connections must be distinguished. They do not only depend on the total offered load, but also on the proportions of H2-, H3-, and H4-connections (traffic mix). The simulation results presented in this paper prove that multirate switching via multichannel connections is feasible for the broadband channel types H2, H3, and H4, and that the proposed switching network has a sufficiently high traffic capacity whatever the traffic mix may be. 相似文献
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Yang L. Abeles B. Eberhardt W. Sondericker D. 《Electron Devices, IEEE Transactions on》1989,36(12):2798-2802
A study of the growth and electronic structure of a-Si:H/a-SiNx:H and a-Si:H/a-SiOx:H heterojunctions by photoemission spectroscopy is discussed. The interfaces in a-Si:H/a-SiOx are atomically abrupt, except for the SiOx on the Si interface which is graded over ~3 Å due to plasma oxidation. The offset energies between the a-Si:H valence band and those of a-SiNx:H and a-SiOx:H are 1.2 and 4.0 eV, respectively. Extra H(~2×1015) is incorporated in the Si on the SiNx interface region. The hole wave functions in a-Si:H are localized on a scale of 1-2 interatomic distances 相似文献
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NIP型非晶硅薄膜太阳能电池的研究 总被引:3,自引:3,他引:0
采用射频等离子体增强化学气相沉积(RF-PECVD)技术制备非晶硅(a-Si)NIP太阳能电池,其中电池的窗口层采用P型晶化硅薄膜,电池结构为Al/glass/SnO2/N(a-Si:H)/I(a-Si:H)/P(cryst-Si:H)/ITO/Al.为了使P型晶化硅薄膜能够在a-Si表面成功生长,电池制备过程中采用了H等离子体处理a-Si表面的方法.通过调节电池P层和N层厚度和H等离子体处理a-Si表面的时间,优化了太阳能电池的制备工艺.结果表明,使用H等离子体处理a-Si表面5 min,可以在a-Si表面获得高电导率的P型晶化硅薄膜,并且这种结构可以应用到电池上;当P型晶化硅层沉积时间12.5 min,N层沉积12 min,此种结构电池特性最好,效率达6.40%.通过调整P型晶化硅薄膜的结构特征,将能进一步改善电池的性能. 相似文献
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利用50fs的激光脉冲对氯丙烯在200nm、400nm和800nm下的光电离/解离机理进行了研究. 实验获得了氯丙烯在三种波长下的电离质谱和光强指数,分析了母体和碎片离子强度随波长的变化关系. 在200nm时,C3H5Cl+来源于飞秒脉冲的直接非共振电离,其它碎片离子均来源于母体离子的电离解离过程;在400nm时,部分分子被激发到高里德堡态从而解离产生C3H5,C3H5再次吸收光子电离导致C3H5+的信号增强;在800nm时,部分分子被同时激发到了排斥态nσ*和多个高里德堡态而发生解离.更多通道产生C3H5使得C3H5+产量进一步增加.由于C3H4+来自C3H5Cl+以及C3H5+的电离解离过程,因此,C3H4+产率随波长变化相对较缓. 相似文献
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Hatzopoulos A.T. Arpatzanis N.. Tassis D.H. Dimitriadis C.A. Templier F.. Oudwan M.. Kamarinos G.. 《Electron Device Letters, IEEE》2007,28(9):803-805
Bottom-gated n-channel thin-film transistors (TFTs) were fabricated using hydrogenated amorphous-silicon (a-Si:H)/ nanocrystalline silicon (nc-Si:H) bilayers as channel materials, which are deposited by plasma-enhanced chemical vapor deposition at low temperatures. The stability of these devices is investigated under static and dynamic bias stress conditions. For comparison, the stability of a-Si:H and nc-Si:H single-layer TFTs is investigated under similar bias stress conditions. The overall results demonstrate that the a-Si:H/nc-Si:H bilayer TFTs are superior compared with their counterparts of a-Si:H and nc-Si:H TFTs regarding device performance and stability. 相似文献
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Salman A. AlQahtani 《Wireless Networks》2018,24(6):1965-1978
With the growing use of the machine-to-machine (M2M) communication and the unlicensed band by advanced long term evolution (LTE-A) networks, known as LTE unlicensed (LTE-U), demand for resource access strategy is rapidly increasing and has recently been attracting considerable attention of mobile operators. The requirement set by 3rd generation partnership project in the release 11 about LTE standards will allow LTE-U and other unlicensed band access technology to peacefully coexist and operate in the same unlicensed band. LTE-U supports not only the human-to-human (H2H) communication but also the M2M communication. In this paper, a new MAC protocol for LTE-U that allow friendly co-existence of H2H with M2M communications working in unlicensed bands is presented. The proposed MAC mechanisms is designed to ensure an efficient and fair channel access as well as enabling better H2H/M2M coexistence. The throughput performance of both H2H and M2M systems is evaluated analytically and by simulation. The impact of H2H/M2M transmissions periods and spectrum sensing time on the throughput performance of H2H and M2M systems are also studied. 相似文献
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从实时应用角度出发,参考H.263编码标准,对H.264视频编码器进行精简,并对耗时较大的算法进行改进.仿真结果表明,简化后的H.264编码器编码速度达到20f/s(帧/秒),达到实时编码要求,且编码性能优于H.263编码标准的编码器. 相似文献
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可视电话系统中多媒体通信控制协议H.245的实现 总被引:2,自引:0,他引:2
介绍了H.324可视电话系统中多媒体通信控制协议H.245的原理及其在PC机Windows95环境下的软件实现,讨论了抽象语法符呈ASN.1和打包编码原理(PER)。H.245主要包括两部分:一是信令的组成和结构模式,另一是通信规程的具体过程。前一部分利用ASN.1和PER对信令进行描述和编码,文中采用一种编译器把信令从ASN.1格式转化为C语言数据结构格式,然后进行处理,后一部分采用有限状态机的 相似文献