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1.
构造了一个基于Transputer和IBM-PC/AT的并行系统开发环境,并在此基础上开发了坐标仪方位及高低跟踪子系统的并行仿真系统,同时给出了仿真软件的OCCAM语言实现。  相似文献   

2.
该文讨论了三维物体隐面消除的并行处理问题。在对串行算法进行深入研究,并根据并行化的需要进行适当修改的基础上,给出了一类改进的MIMD并行浓度缓冲器算法,并在多Transputer系统上实现。文中还对有关算法的效率进行了比较,算例表明实际效率与理论分析相符。  相似文献   

3.
并行算法的研究应以实用性,可实现性以及最大的并行处理效率为出发点,在解常微分方程Runge Kutta并行地的基础上进一步提出了一种针对Transputer并行多处理机系统实现的异步并行算法,该算法可划分若干OCCAM并发进程一一映射到多个处理机上且进程间采用异步通讯机制。  相似文献   

4.
结构动力分析显式积分并行算法与实现   总被引:2,自引:0,他引:2  
在分布式并行计算机环境下开展有限元并行算法研究是计算力学领域的前沿课题之一。基于区域分裂法,提出了结构动力分析两种形式的显式积分法的并行算法及步骤;同时,在用Transputer组成的分布式MIMD并行计算机上,采用3L并行Fortran编写了计算程序,并将其移植到串并行混合有限元分析软件PFEM中;最后,通过对三维空间钢架结构的实际分析,不仅验证了算法和程序设计的正确性,而且结果表明算法具有较高的并行效率。当2个和3个CPU工作时,并行效率分别为0.8和0.7。  相似文献   

5.
论述了目前的软件开发中存在的两个问题:①现有的高级语言对各种高级计算模型支持的不足;②快速原型开发和高质量产品开发之间的矛盾,针对上问题,设计了一种新的面向对象语言Transframe并研制了它的开发环境MagicFrame.Transframe语言具有的参数化的动态类、名的一般模型、类与函数概念的统一、成员类继承和代理等多种机制为构造各种领域模型提供了有力的支持。基于Transframe的开发环  相似文献   

6.
该文在对双三次样条曲面插值问题的并行方案的优选、任务分配的优化以及Transputer并行结构上并行通讯的策略进行深入研究的基础上,给出了一种高效的MIMD并行算法,这种算法模式也适用于B样条和非均匀有理B样条等曲面插值问题,因而适用范围广,具有代表性。该算法的优点是各处理机负载平衡度高、通讯量小,其效率几乎接近1,大大高于现有解三对角方程组的并行直接法的效率(如分块LDL^T分解,DDM方法的效  相似文献   

7.
结构动力分析隐式积分并行算法与实现   总被引:2,自引:0,他引:2  
在分布式并行计算机环境下进行了有限元并行算法的研究,建立了结构动力分析的两种隐式积分方法(Newmark方法和Wilson-θ方法)的并行化方法与算法步骤,设计了变带宽一维存储时有效刚度矩阵的三角分解并行算法;基于Transputer的分布式MIMD并行计算机上,采用3L并行FORTRAN编写了计算程序,并将其移植到有限元串并行混合分析软件PFEM中。以平面问题和空间板弯问题作为实例进行了数值计算。结果表明计算方法具有较高的并行效率。当自由度为7579,最大带宽为726时,2个和3个处理器工作的并行效率分别为0.70和0.55。  相似文献   

8.
介绍了第四代语言-Transact的产生基于工程的指导思想。指出了面向问题语言的迫切需要及其特点;定义了第四代语言并指出了其优点,提高了软件生产率等。新开发的第四代Transact语言成功地应用于HP/3000-70小型机,介绍了应用系统环境系统设计和功能,文档管理系统和特点。  相似文献   

9.
利用单跨输电线的传递矩阵得到三跨输电线的控制方程,设计了两种并行算法求解该控制方程,并应用于一个工程实例。在InmosT800Transputer上实现了上述两种并行算法。计算结果与实测结果相比较,表明传递矩阵法是一种有效的求解多跨输电线平面运动固有频率和振型的方法,而并行算法应用于此类问题也可获得理想的加速比。  相似文献   

10.
并行算法的研究应以实用性、可实现性以及最大的并行处理效率为出发点.在解常微分方程(组)RungeKutta并行算法的基础上进一步提出了一种针对Transputer并行多处理机系统实现的异步并行算法,该算法可划分成若干OCCAM并发进程一一映射到多个处理机上且进程间采用异步通讯机制.作为一个应用实例,文中用OCCAM语言编写了三阶RungeKutta异步并行算法程序,做了算例,并获得了令人满意的结果.实例表明,由于该算法避免了进程间同步通讯等待所需的时间开销,而使算法的效率得以提高.  相似文献   

11.
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.  相似文献   

12.
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.  相似文献   

13.
王慧 《科技信息》2008,(10):240-240
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.  相似文献   

14.
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.  相似文献   

15.
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.  相似文献   

16.
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.  相似文献   

17.
AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…  相似文献   

18.
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。  相似文献   

19.
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.  相似文献   

20.
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.  相似文献   

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