MPEG-4视频验证模型

ＭＰＥＧ４是一个正在制定的编码标准,除了具有ＭＰＥＧ１和ＭＰＥＧ２标准的基于“帧”的功能以外,ＭＰＥＧ４视频编码算法还支持多媒体环境中对视频景物内的“物体”进行存取与操纵。概述了ＭＰＥＧ４视频编码标准将支持的新功能,并描述了第４版ＭＰＥＧ４视频验证模型的结构。     

视频压缩编码的国际标准

为了使视频通信能更有效地利用信道带宽和存储空间，必须对视频数据进行压缩编码．在介绍了视频压缩编码的基本方法以后，着重叙述应用范围从静止图像到ＨＤＴＶ的国际视频编码标准或方案，其中包括ＪＢＩＧ，ＪＰＥＧ，Ｈ．２６１，ＭＰＥＧ和ＨＤＴＶ等．最后，对视频压缩领域的应用现状和前景作了一些分析．     

尼龙6/乙烯-1-辛烯共聚物接枝马来酸酐共混体系的亚微相态与性能

采用熔融挤出法制备了ＰＡ６／ＰＯＥ和ＰＡ６／ＰＯＥｇＭＡＨ共混合金,借助于力学试验机、ＴＥＭ、ＳＥＭ、Ｍｏｌａｕ实验和毛细管流变仪测定了共混合金的力学性能、亚微相态、冲击断口形貌和流变性能,系统地研究了ＰＯＥｇＭＡＨ对ＰＡ６的增容增韧作用。结果表明,ＰＯＥ与ＰＡ６是不相容体系,经ＭＡＨ接枝改性后的ＰＯＥ与ＰＡ６发生化学反应,生成的ＰＯＥｇＰＡ６共聚物起到了原位增容作用,细化了分散相尺寸,有效地改善了合金的力学性能,ＰＡ６／ＰＯＥｇＭＡＨ共混合金的缺口冲击强度是ＰＡ６的１２倍。     

VOD系统上传输MPEG-2的误码处理

从误码修补和误码恢复两方面讨论了在点播视频（ＶＯＤ）系统上传输ＭＰＥＧ２ 的误码处理技术．在误码修补中论述了ＭＢｒｅｓｙｎ．的新方法，它考虑ＡＴＭ 的传输特点，对ＭＰＥＧ２ 略加改动，方法简单且能明显改善视频质量．误码恢复中，运用了交织编码技术，可提高ＶＯＤ系统的可靠传输．     

人免疫缺陷病毒2型(HIV-2)穿膜蛋白基因片段克隆表达

以人免疫缺陷病毒２（ Ｈ Ｉ Ｖ２） 的原病毒基因组为模板,通过套式 Ｐ Ｃ Ｒ 扩增得到了 Ｈ Ｉ Ｖ２ 的一段特异性膜抗原蛋白基因片段;随后将此片段克隆入诱导表达载体ｐ Ｇ Ｅ Ｘ５ Ｘ１ ,获得了重组表达质粒ｐ Ｇ Ｅ Ｘ３６ Ｅ Ｎ Ｖ． Ｉ Ｐ Ｔ Ｇ 对重组表达菌株诱导后, Ｓ Ｄ Ｓ Ｐ Ａ Ｇ Ｅ 结果显示重组菌株有特异性表达蛋白带产生     

MPEG-2运动补偿的VLSI设计

基于ＭＰＥＧ－２解码中运动补偿的控制复杂、数据吞吐量大，实现较困难，提出了一种适合于ＭＰＥＧ－２ＭＰ＠ＭＬ的运动补偿硬件实现方案，解决了时序分配，输入输出控制等较难处理的问题。文中的方案已经采用ＶＨＤＬ描述，并使用电子设计自动化（ＥＤＡ）工具进行了模拟和验证。结果表明，方案满足ＭＰＥＧ－２解码的要求，可用于ＭＰＥＧ－２的ＶＬＳＩ实现。     

HDTV视频编码器的场景切换

当图象序列的帧与帧之间发生场景切换时,会影响视频编码器的编码质量．为提高高清晰度电视（ＨＤＴＶ）的视频编码器的编码质量,针对其采用的国际标准ＭＰＥＧ－２中ＧＯＰ的结构,提出按场景切换对齐的一种新的ＧＯＰ格式．软件模拟结果显示,ＭＳＥ值明显缩小,ＳＮＲ提高了３ｄＢ,效果较好．     

红细胞生成素(EPO)在中国仓鼠卵巢细胞(CHO)中稳定表达

将ＥＰＯｃＤＮＡ分别插入真核表达质粒载体ｐＳＶ２ｄｈｆｒ和ｐｃＤＮＡ３的适当位点,用电脉冲法导入ＣＨＯ细胞,用ＥＬＩＳＡ法检测ＥＰＯ的表达量,用ＴＦ１细胞检测ＥＰＯ表达产物的生物活性．结果表明,用ｐＳＶ２ｄｈｆｒ作为载体,在抗ＭＴＸ阳性细胞克隆中,获得了表达ＥＰＯ（２５８ｎｇ／ｍＬ培养液）的ＣＨＯ细胞株,并且表达产物具有生物活性．进一步的传代和冻存试验表明,所得细胞株表达ＥＰＯ的水平不受传代和冻存的影响     

基于MPEG-4的实时视频编码研究

对ＭＰＥＧ－４的视频编码算法,就其基本内容的压缩编码、对象分层、以ＶＬＢＶ和ＨＢＶ为核心的视频编码和“ｓｐｒｉｔｅ”预测编码等技术进行了分析,并进一步阐述其在应用系统中的使用的使用技术。     

MPEG-2视频变长码解码VLSI设计

提出了一个ＭＰＥＧ２ 视频解码中变长码解码的ＶＬＳＩ设计．采用桶形移位缓冲器并行解变长码、分别进行变长码的长度计算和解码以及将码表分割成多个小码表等新的硬件设计,使得每个周期解一个变长码的码字,保证了ＭＰＥＧ２ ＭＰ＠ ＭＬ的实时解码,并为更复杂的应用提供了扩展的余地．     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.