立交叉巷道施工略探

随着矿井开采深度的增加,采掘开巷道的布置越来越复杂,立交叉巷道施工成为矿井工程的一项重点问题。在此列举了部分实例,阐述了立交叉巷道施工技术,说明了矿井系统设计上的一个新趋向。

交叉互立式会计信息查询创新研究——以辅助核算在总账系统中的应用为例

在信息时代,会计信息系统在企业经营管理中扮演着提供信息、参与决策的重要角色。现代企业多采用财务业务一体化的信息管理模式,通过会计信息系统自动采集、存储大量数据。但存储在系统中的原始数据由于缺乏整理,导致管理者难以在管理中快速、准确地提取决策有用信息。对存储在系统中海量的、繁杂的数据进行便捷有效的分类、归纳、汇总,形成交叉互立式的信息查询,是会计信息系统在信息时代的新任务,也是企业管理决策的迫切要求。文章以辅助核算在总账系统中的应用为例,分析了其在总账系统中存在的必要性,归纳了辅助核算的实现方式,探究了其在发展过程中遇到的障碍,并由此提出会计信息有效查询策略。

互通式立体交叉的匝道的纵坡设计

醉侧重叙述了匝道纵坡设计与主线的纵坡设计的不同之处，详细记述了匝道纵坡视距所依据的“标准”和“标准”的制定办法以及应该注意的事项等，尤其是流出或流入点处的纵坡推算，本人根据实际工作推导出其简单适用的计算公式。

Multi-phase bus signal priority strategy at isolated intersections

To satisfy the multiple priority requests from buses that arrive at different phases within a small time window, a multi-phase bus signal priority （MPBSP） strategy is developed. The proximity principle is brought forward to settle the conflicts among multiple priority requests and arrange the optimal priority sequence. To avoid over saturation of the intersection, a conditional MPBSP algorithm that adopts early green and green extension strategies is developed to give priority to the bus with the highest priority level when green time that each phase runs makes its saturation degree not larger than 0. 95. Finally, the algorithm is tested in the VISSIM environment and compared with the normal signal timing algorithm. Sensitive analysis of the number of priority phases, bus demand, and volume to capacity ratios are conducted to quantify their impacts on the benefits of the MPBSP. Results show that the MPBSP strategy can effectively reduce bus delays, and with the increase in the number of priority phases, the reduction range of bus delays also increases.

Multiply-twisted Hypercube with Four or Less Dimensions is Vertex-transitive

P Kulasinghe and S Bettayeb showed that any multiply-twisted hypercube withfive or more dimensions is not vertex-transitive. This note shows that any multiply-twistedhypercube with four or less dimensions is vertex-transitive, and that any multiply-twistedhypercube with three or larger dimensions is not edge-transitive.

Supercontinuum Generation Enhanced by Cross-phase Modulation in Dispersion-flattened and Decreasing Fiber

Supercontinuum spectrum generation in a dispersion-flattened and decreasing fiber with two orthogonally polarized pulses was simulated and calculated. The research results indicated that the supercontinuum spectrum generated by two orthogonally polarized pulses is wider and flatter than that generated by single polarized pulse due to cross-phase modulation. The cross-phase modulation effect can enhance the supercontinuum spectrum generation. When the pump power of the input pulse is lower, the enhancement of supercontinuum spectrum generation by cross-phase modulation effect is more significant.

Cellular Automata Model for a Specific Traffic Regime and 1/f Noise

We examine the traffic lights regime to enable the fastest overall approach to a city for a specific case. The case involves a traffic light where one continues on the main road, into which additional cars are entering at the light. At this intersection an alternative route begins, which is longer but into which no additional cars are entering. To keep the total number of vehicles constant, we subtract on the main road far from the intersection, the same number of cars as were added at the intersection. In addition to checking different densities we check also the influence of changes in the number of cars which were added. We calculate the Fourier transform of the average on each traffic light cycles of the velocity on the main road and bypass. We obtained different results for different cases. All the cases can be written as 1/fa .

互通式立交方案的选择与评价

本文提出对互通式立交布设应采取多方案设计,从中选出最优良的设计方案。并提出如何选择、评价较合适的立交形式。

Recent advances in organic electrosynthesis employing transition metal complexes as electrocatalysts

Organic electrosynthesis has been widely used as an environmentally conscious alternative to conventional methods for redox reactions because it utilizes electric current as a traceless redox agent instead of chemical redox agents. Indirect electrolysis employing a redox catalyst has received tremendous attention, since it provides various advantages compared to direct electrolysis. With indirect electrolysis, overpotential of electron transfer can be avoided, which is inherently milder, thus wide functional group tolerance can be achieved. Additionally, chemoselectivity, regioselectivity, and stereoselectivity can be tuned by the redox catalysts used in indirect electrolysis. Furthermore, electrode passivation can be avoided by preventing the formation of polymer films on the electrode surface. Common redox catalysts include N-oxyl radicals, hypervalent iodine species, halides, amines, benzoquinones(such as DDQ and tetrachlorobenzoquinone), and transition metals. In recent years, great progress has been made in the field of indirect organic electrosynthesis using transition metals as redox catalysts for reaction classes including C–H functionalization, radical cyclization, and cross-coupling of aryl halides-each owing to the diverse reactivity and accessible oxidation states of transition metals. Although various reviews of organic electrosynthesis are available, there is a lack of articles that focus on recent research progress in the area of indirect electrolysis using transition metals, which is the impetus for this review.