共查询到20条相似文献，搜索用时 125 毫秒
1.
The combination of online or semi-online with deterioration jobs has never been researched in scheduling problems. In this paper, two semi-online parallel machine scheduling problems with linear deterioration processing time are considered. In the first problem, it is assumed that the deterioration rates of jobs are known in an interval, that is, bj ∈[0, α], where 0 〈α≤ 1 and bj denotes the linear deterioration rate. In the second problem, it is assumed that the largest deterioration rate of jobs is known in advance, that is, b = max1≤j≤n {bj }. For each of the two problems, a heuristic MBLS algorithm is worked out and its worst-case ratio is analyzed. At the same time, the worst-case ratio of the list （LS） algorithm is investigated and it is proved that all the ratios are tight. 相似文献
2.
《双语学习》2007,(7)
In the Ode to the Grecian Urn Keats came to the realization that the immortality he had quested for is a myth that cannot be interpreted. The marbleized sacrificial rite on the ancient urn implies that human life is a process of endless sacrifice. This inevitable recognition of mortal limitation during the process of human growth can not be dissolved by the soothing oracle that Beauty is truth, truth beauty'. 相似文献
3.
In the Ode to the Grecian Urn Keats came to the realization that the immortality he had quested for is a myth that cannot be interpreted. The marbleized sacrificial rite on the ancient urn implies that human life is a process of endless sacrifice. This inevitable recognition of mortal limitation during the process of human growth can not be dissolved by the soothing oracle that ＇Beauty is truth, truth beauty＇. 相似文献
4.
This paper presents the forward displacement analysis of an 8-PSS （prismatic-spherical-spherical） redundant parallel manipulator whose moving platform is linked to the base platform by eight kinemtic chains consisting of a PSS joint and a strut with fixed length. A general approximation algorithm is used to solve the problem. To avoid the extraction of root in the approximation process, the forward displacement analysis of the 8-PSS redundant parallel manipulator is transformed into another equivalent problem on the assumption that the strut is extensible while the slider is fixed. The problem is solved by a modified approximation algorithm which predicates that the manipulator will move along a pose vector to reduce the difference between the desired configuration and an instantaneous one, and the best movement should be with minimum norm and least quadratic sum. The characteristic of this modified algorithm is that its convergence domain is larger than that of the general approximation algorithm. Simulation results show that the modelified algorithm is general and can be used for the forward displacement analysis of the redundant parallel manipulator actuated by a revolute joint. 相似文献
5.
In the Ode to the Grecian Urn Keats came to the realization that the immortality he had quested for is a myth that cannot be interpreted. The marbleized sacrificial rite on the ancient urn implies that human life is a process of endless sacrifice. This inevitable recognition of mortal limitation during the process of human growth can not be dissolved by the soothing oracle that Beauty is truth, truth beauty： 相似文献
6.
Probability density function (PDF) method is proposed for analysing the structure of the reconstructed attractor in computing the correlation dimensions of RR intervals of ten normal old men. PDF contains important information about the spatial distribution of the phase points in the reconstructed attractor. To the best of our knowledge, it is the first time that the PDF method is put forward for the analysis of the reconstructed attractor structure. Numerical simulations demonstrate that the cardiac systems of healthy old men are about 6 - 6.5 dimensional complex dynamical systems. It is found that PDF is not symmetrically distributed when time delay is small, while PDF satisfies Gaussian distribution when time delay is big enough. A cluster effect mechanism is presented to explain this phenomenon. By studying the shape of PDFs, that the roles played by time delay are more important than embedding dimension in the reconstruction is clearly indicated. Results have demonstrated that the PDF method represents a promising numerical approach for the observation of the reconstructed attractor structure and may provide more information and new diagnostic potential of the analyzed cardiac system. 相似文献
7.
The mechanism involving the effect of disorder/order transformation on the environmental embrittlement in gaseous H2 is summarized. It is shown that there is no hydrogen embrittlement in disordered state of Kurnakov type intermetallics in gaseous H2. However, the H2-induced environmental embrittlement for the ordered alloy having identical chemical composition becomes severer as the degree of the order increases. The results of testing on the ion gage turned on and off during tensile testing show that the more sensitive to H2-induced hydrogen embrittlement for ordered alloy than disordered one is attributed to the fact that atomic ordering may accelerate the kinetics of the catalytic reaction to produce more atomic hydrogen. The results on simultaneous hydrogen charging show that disordered alloys embrittled as hydrogen atoms are forced into the material implying that the embrittlement of ordered alloy in gaseous H2 is also due to the acceleration of the kinetics of catalytic reaction. The above suggestion was further verified by the adsorption tests of Ni3Fe intermetallics powder. It is shown that the amount of chemically adsorbed hydrogen in ordered state is significantly larger than that adsorbed by the disordered alloy, indicating that the more sensitive to H2-induced embrittlement in the ordered state of alloy is essentially due to the accelerated catalytic reaction. 相似文献
8.
Tracy Jiang 《英语大王(小学)》2003,(1)
Blue is the sky that finally appeared behind a winter of gray。Blue is the silhouette of a bird soaring high in the sky. Blue is the pedals of a newborn flower. Blue is the current of a rushing stream freed from the cold. Blue is the broken shells that revealed the world to twittering robins. 相似文献
9.
It is explored that the line integral is a path independent in two or three arbitrary dimensional orthogonal curvilinear coordinate systems, which is based on the integral condition with the path independent in two or three dimensional rectangular coordinate systems. Firstly, according to the coordinate transformation, the condition that the line integral is the path independent in the polar coordinate system is obtained easily from the Green’s theorem in two-dimensional rectangular coordinate system and the condition is extended to arbitrary two-dimension orthogonal curvilinear coordinates. Secondly, through the coordinate transformation relationship and the area projection method, the Stokes formula in three-dimensional rectangular coordinate system is promoted to the spherical coordinate system and cylindrical coordinate system, and the condition that the line integral is a path independent is obtained. Furthermore, the condition is extended to arbitrary three-dimension orthogonal curvilinear coordinates. Lastly, the conclusions are made. 相似文献
10.
Myrenda Ding 《语数外学习(高中版)》2013,(10):99-99
The ending of John Steinbeck’s Of Mice and Men,viewed alone,is not a tragedy at all;while death is involved the life that has been taken is merely that of a murderer and threat to human safety.However,the death of Lenny Small is actually far more tragic when viewed in the context of the novel.This essay will explore some of the ways Steinbeck manipulates the emotions of the reader so that readers syropalhibt?with the"murderer". 相似文献
11.
CAI Zi-jia 《海外英语》2015,(1)
Skopos Theory is the kernel part of functionalism, holding that the skopos rule is the top-ranking rule that justifies the overall translation process. This paper attempts to make an analysis of the C-... 相似文献
12.
This paper tries to analyze Philip Larkin’s poem"High Window"from a deconstructive perspective. It is to show that in the poem the key words/signifiers are always under erasure, and thus the chain of signification is endless since the poem is self-deconstructing. Then, the paper argues that the linguistic features of the poem paradoxically meaningful in the sense that it reflects the poet’s skepticism and anxiety. 相似文献
13.
《Reading and Writing(高中版)》2006,(5)
一In America,Monday is the day that most people likeLeast.Monday was the beginning of the workweek.It’snot surprised that the day they like most isFriday,which is end of the workweek.Life is different on the weekend:most AmericanTake care of their houses… 相似文献
14.
Vanishing torsion of parametric curves 总被引：1，自引：0，他引：1
JUHASZ Imre 《浙江大学学报(A卷英文版)》2007,8(4):593-595
We consider the class of parametric curves that can be represented by combination of control points and basis func- tions. A control point is let vary while the rest is held fixed. It’s shown that the locus of the moving control point that yields points of zero torsion is the osculating plane of the corresponding discriminant curve at its point of the same parameter value. The special case is studied when the basis functions sum to one. 相似文献
15.
In this paper,the expected discounted penalty function is considered in the risk process with the time-correlated claims,that is,every main claim can cause a by-claim but the occurrence of the by-claim may be delayed.By the renewal argument,it is shown that the expected value satisfies a system of integro-differential equations.Moreover,the explicit expression for the Laplace transform of the expected value is derived by means of Rouchés theorem.A numerical example is 相似文献
16.
杨正瓴 《天津大学学报(英文版)》2011,17(6):446-449
The more unambiguous statement of the P versus NP problem and the judgement of its hardness, are the key ways to find the full proof of the P versus NP problem. There are two sub-problems in the P versus NP problem. The first is the classifications of different mathematical problems (languages), and the second is the distinction between a non-deterministic Turing machine (NTM) and a deterministic Turing machine (DTM). The process of an NTM can be a power set of the corresponding DTM, which proves that the states of an NTM can be a power set of the corresponding DTM. If combining this viewpoint with Cantor’s theorem, it is shown that an NTM is not equipotent to a DTM. This means that "generating the power set P(A) of a set A" is a non-canonical example to support that P is not equal to NP. 相似文献
17.
Scott Thornbury 《通化师范学院学报》2003,(3)
Is grammar a thing or is it something that happens? This paper will argue that maybe it is a bit of both. When we describe language, as in the grammar of English, grammar is more noun-like than verb-like. It is a body of facts about the language: "The present perfect is formed by the auxiliary have plus the past participle", etc. On the other hand, when we use language in real communication, grammar manifests itself in ways that seem to have little to do with the conscious appli 相似文献
18.
LESK Michael 《浙江大学学报(A卷英文版)》2005,6(11):1169-1178
SUMMARY Critics of large digitization projects say that the quality of information available to students is being lost in a rush to increase its quantity. But in reality the larger amounts of material mean that it is more likely students can find appropriate and relevant documents. What is happening is that people react to the large quantities of material on the Web and the power of the search engines by seeking the right places to read, rather than being limited to a few items by scarcity … 相似文献
19.
Test plays an important role in our lives in that it can cause backwash towards our teaching and learning.Thus the pur pose of the present study is to examine the quality of an English test paper in a junior middle school of Urumqi according to the language test theories.Through the data collection and analyses,the results indicate that the test paper is a medium-level test and the reliability is suitable.From the correlation analysis,we can see that each part has a high correlation value to the total,indicat ing that all of them contribute to generate language proficiency. 相似文献
20.
The language is a play of signs. However, behind the signs is the culture manipulates the signs. The sign is the surface structure; while under the surface is that the thinking pattern matters, which is the only small part of the culture. The culture difference always exists. I would like to study it in terms of the problems which the essay reveals. The first part is to list examples, and the second part tries to analyze it in terms of thinking patterns. The last part is the concluding part. It intends to find solutions to avoid that problem. 相似文献