排序方式: 共有34条查询结果,搜索用时 0 毫秒
21.
Abstract. This article presents an analysis of location and pricing decisions of a monopolist about to open several stores in a compact geographical space. The number of stores is made endogenous by the introduction of fixed costs. A novel methodology is developed, by which the firm's location and price decisions are represented as continuous functions defined over the geographical space. This modeling artifact generates a negligible error but simplifies the solution considerably and allows the derivation of several intuitive results. Although the focus is on one‐dimensional markets, it is shown that the method can easily be adapted to two‐dimensional markets. 相似文献
22.
The dative case in Vafsi appears in three structures: (a) the case of the experiencer in sensory verbs, (b) the case of the indirect object (IO), and (c) the case of the object of the preposition /da/ (to), or the preposition /az/ (to), or the enclitic /-o/ (to), or the object of the postposition /rā/ (for). In Vafsi, as in many other Indo-European languages, sensory verbs necessitate the emergence of quirky subjects which have the experiencer function and are dative case marked. In order to analyze the dative case marking in Vafsi using optimality theory, this article uses the faithfulness constraint of faith-lex and the markedness constraint hierarchy of *ERG>>*DAT>>*ACC>>*NOM. Vafsi always allocates the dative case to the IO of the ditransitive verbs. This phenomenon is illustrated by use of an optimality theory (OT) tableau. Some Vafsi ditransitive verbs dative case mark the IOs using adpositions. If so, Vafsi differential adpositional case marking (DACM) will rule, as the IOs are objects of adposition (OAs) simultaneously. 相似文献
23.
24.
25.
26.
It is well known that the soil-structure interaction (SSI) changes the dynamic response of a structure supported on flexible soil. The analysis of optimally controlled SSI systems has certain difficulties due to the nature of the SSI and the optimal control problem. In this paper, a two-step iteration-based numerical algorithm is proposed to handle optimally controlled SSI systems under earthquakes. First, the optimal control forces are obtained by using a fixed-base system. Then, the optimal control forces are converted to the frequency domain by the Fourier transform technique to be used in the equations of the SSI system. The lateral displacement and the rocking of the foundation are obtained from the equations of the SSI system containing the optimal control forces in the frequency domain. The lateral displacement and rocking of the foundation are then converted to the time domain by the inverse Fourier transform technique, and the lateral accelerations and the rocking accelerations of the foundation are obtained by the forward finite difference method. During the second step, the optimal control forces are calculated again by using the lateral acceleration and the rocking acceleration of the foundation along with the earthquake ground motion. Using the method explained above, the optimal control forces obtained in the time domain are used in the equations of the soil-structure system from which the behavior of foundation and structure is obtained. In the final section of the paper, a numerical study is conducted for a controlled structure supported on flexible soil. 相似文献
27.
28.
Tariq Usman Saeed Roshanak Nateghi Thomas Hall Brigitte S. Waldorf 《Geographical analysis》2020,52(3):394-417
The article analyzes area-wide alcohol-related driving crash rates, with an emphasis on neighborhood effects, edge effects, and spatial effects arising from shared roadways that traverse area boundaries. Using township data for the state of Indiana, spatial Durbin models of alcohol-related driving crash rates are presented. The results suggest that a township's population composition and its abundance of alcohol-related businesses impact the alcohol-related driving crash rates. Moreover, positive spatial dependence is found to be highly significant, cautioning against the reliance on possibly biased OLS estimators. Due to restrictions in access to the crash and alcohol-related businesses data of the neighboring states, an alternative approach is adopted to address the spatial edge effects that may arise from alcohol consumption of residents from the edge areas of the neighboring states (possibly leading to crashes inside the border townships). Given the variation in alcohol laws and regulations across states, an empirical assessment of the edge effects is particularly relevant where some border crossing may be deliberate so as to avoid more stringent alcohol restrictions. 相似文献
29.
Saeed Talajooy 《Iranian studies》2011,44(4):497-519
One of the major trends in experimental theater refashions the representational and presentational techniques of ancient rituals, medieval dramatic forms and popular performing traditions to create new forms of dramatic expression. In pre-revolutionary Iran, the proponents of this trend included those who worked with Iran National Theater and Theater Workshop. The 1979 revolution heralded the arrival of a different kind of drama in response to a host of new subjects and restrictions. However, unlike the political upheavals of previous periods which led to catastrophic discontinuity in the development of Iranian theater, it did not result in a complete breach. The post-revolutionary practitioners continued working with the templates devised by their pre-revolutionary colleagues, creating a dramatic tradition that has produced several masterpieces during recent decades. The purpose of this paper is to put the history of this experimental trend in perspective and examine the works of three of its major post-revolutionary practitioners. As such it will not focus on the history of indigenous forms or western-style theater in Iran, but on the recent history of this experimental mode and how its practitioners have refashioned Iranian performing traditions. 相似文献
30.