Predictive economic efficiency of combining nuclear power plants with autonomous hydrogen power complex

Currently, the United Energy System (UEC) of Russia is trending in the deficit of peak and half-peak capacity with a simultaneous increase in the number of nuclear power plants (NPPs), which will require the participation of the NPPs in the variable part of the schedule of electrical loads.In addition to the economic need to maintain the high-level utilization rate, there are technological limitations of maneuverability for NPPs.The authors developed an approach to solving this problem by combining with an environmentally friendly energy source – an autonomous hydrogen power complex, which includes thermal batteries and an additional multifunctional low-power steam turbine installation.The developed energy complex can also provide reliable reservation of electricity supply to consumers of their own needs of the nuclear power plant in case of complete blackout of the plant.The feasibility study of the main equipment of the autonomous hydrogen power complex, which is necessary for combining with a two-unit nuclear power plant with WWER-1000, has been evaluated.On the basis of the assessment of the inflation indicators of the Russian economy over the past 11 years, three variants of fuel cost dynamics and tariff rates for electricity (capacity) as well as the size of operating costs, including depreciation deductions to the main equipment, are defined, taking into account the current principles of price formation.The result is a value for accumulated net present value, depending on the ratio of the cost of the half-peak and off-peak electricity at different inflation rates.The positive economic effect of reducing the risk of the core damage accident, replacing the construction of the gas turbine unit as a maneuverable source of electricity in the power grid and increasing the income of the Russian federal budget from the savings of natural gas has been taken into account.The greatest economic efficiency is achieved with maximum projected inflation, which is associated with the maximum rate of discounting and the high rate of growth of electricity tariffs.Reducing the risk of the core damage accident ensures that the proposed approach is competitive in all the inflation options under consideration and the ratio of electricity tariffs.     

线型旅游空间研究——以京杭大运河为例

在旅游地空间结构和相关"线"状空间研究的基础上,借鉴在世界遗产保护领域的先进理念"文化线路",提出"线型旅游空间"概念,界定为基于遗产保护进行旅游开发的旅游地空间类型.以京杭大运河为例,将其空间特征总结为历史悠久、跨越区域、文化多元和产品趋同等4个主要方面,并在此基础上提出了对大运河旅游规划的启示,应树立保护为先的理念,在全局的视角下避免目前的旅游形象和旅游产品趋同的现象,进行多角度的差异性定位;同时,基于大运河的大尺度、跨区域性,提出建立相应机构加强协调管理,并进行流域联合营销和区域联合营销.     

光照重力坝坝基断层影响及处理的三维数值模拟

200m级光照重力坝坝踵和坝趾分别存在较大规模的断层，为了分析和评价断层对重力坝应力位移和坝基稳定性的影响，以及建坝后由于围压变化导致的断层变形模量提高对坝体的影响，对重力坝典型坝段和坝基岩体的联合作用进行三维数值模拟。对两条断层分别进行浮值分析，用强度储备系数法计算受断层影响的坝基安全稳定性，并分别模拟对两条断层进行的不同方式加固处理措施进行模拟。研究结果表明，位于坝趾的F2断层对坝体应力位移状态影响较大，也是坝基稳定性的控制性因素之一，在进行固结灌浆处理提高强度后，不仅可以提高坝基稳定性，而且可使坝体应力状态得到改善。位于坝踵的F1断层开挖并回填混凝土处理不宜过深。同时，建坝后围压变化导致断层变形模量的提高对于坝体应力控制是有利的。     

山东省苍峄铁矿兰陵矿区岩矿芯缩减方案及其意义

近些年来,随着我国地质勘查工作的快速发展,全国范围内产生了数量巨大的岩矿芯等实物资料,根据1990年颁发的《岩矿芯管理通则》的规定要求,由于岩芯增长数量成爆炸式增长,各岩芯产生及保管单位原有的保管库房已远远不能满足保管需求。因此,为了更有效的开展岩芯保管工作,根据"科学论证,慎重处置"的原则,按照规定的工作程序和技术方法对岩矿芯进行缩减已成为必然趋势。     

河流下浅埋深薄基岩煤层部分开采可行性分析

控制覆岩破坏高度是实现水体下安全开采的关键。针对“浅埋深、薄基岩、坚硬顶板”河流下压覆煤炭资源的问题，采用数值模拟的方法，计算了巷柱式和房柱式等部分开采的覆岩破坏高度，并从防水煤岩柱留设、岩梁极限跨度以及煤柱稳定性3个方面论述河流下部分开采的可行性。研究结果表明，部分开采能够很好地控制覆岩破坏高度，煤岩柱厚度基本满足留设防水安全煤岩柱要求；由于上覆基岩柱中存在厚度大于10 m的粗砂岩，在跨度小于8.53 m的情况下可以支撑上覆岩层；设计煤柱安全系数为1.28～1.81，均满足要求。采用采6 m、留6 m的巷柱（窄条带）式开采是最佳方案，面积采出率为50%，按总采出率45%计算，可解放河流压覆区域约52万t煤炭。     

VEGF and FGF2 Improve Revascularization,Survival, and Oocyte Quality of Cryopreserved,Subcutaneously-Transplanted Mouse Ovarian Tissues

This study was conducted to investigate the effect of the vascular endothelial growth factor (VEGF) and fibroblast growth factor 2 (FGF2) on revascularization, survival, and oocyte quality of cryopreserved, subcutaneously-transplanted mouse ovarian tissue. Autologous subcutaneous transplantation of vitrified-thawed mouse ovarian tissues treated with (experimental group) or without (control group) VEGF and FGF2 was performed. After transplantation to the inguinal region for two or three weeks, graft survival, angiogenesis, follicle development, and oocyte quality were examined after gonadotropin administration. VEGF coupled with FGF2 (VEGF/FGF2) promoted revascularization and significantly increased the survival rate of subcutaneously-transplanted cryopreserved ovarian tissues compared with untreated controls. The two growth factors did not show long-term effects on the ovarian grafts. In contrast to the untreated ovarian grafts, active folliculogenesis was revealed as the number of follicles at various stages and of mature oocytes in antral follicles after gonadotropin administration were remarkably higher in the VEGF/FGF2-treated groups. Although the fertilization rate was similar between the VEGF/FGF2 and control groups, the oocyte quality was much better in the VEGF/FGF2-treated grafts as demonstrated by the higher ratio of blastocyst development. Introducing angiogenic factors, such as VEGF and FGF2, may be a promising strategy to improve revascularization, survival, and oocyte quality of cryopreserved, subcutaneously-transplanted mouse ovarian tissue.     

An elementary approach to optimal discrete-time search strategies

Optimal strategies are known for the finite and infinite horizon discrete-time search with constant unit cost and without recall. These strategies were obtained in the theory of optimal stopping, based on the martingale convergence theorem and other tools from probability theory. We present here an elementary approach to these problems, relying only on routine calculation of expected values. In the finite horizon case, the solution utilizes a simple form of backward induction, in conjunction with a nonlinear dynamical system, to compute the parameters of the optimal strategy. An elementary proof is also given that a simple threshold search is optimal among all strategies with finite expected total cost.     

网格环境中可靠性增强的资源预留策略

提出一种基于随机服务模型的可靠性量化计算方法,该策略采用随机服务系统描述网格资源的预留服务模型,通过分析预留请求的统计特征来评估接纳当前预留请求不发生违约的概率,然后依据备选资源集合中的违约概率来进行预留请求接纳和任务资源选择,从而提高资源预留时的可靠性。实验表明,与传统的预留策略相比,该策略在提高资源利用率、降低违约率以及对动态负载压力变化情况下的反应方面,表现出更好的有效性、适应性。     

全预制装配整体式剪力墙结构构件工厂化生产技术

全预制装配整体式剪力墙结构(NPC)剪力墙、柱、电梯井、阳台、空调板、雨篷等构件采用工厂化预制生产,预留注浆管及节点钢筋;梁、板等水平构件采用工厂化预制生产叠合梁、板,预留上层钢筋及端部节点钢筋.通过现场吊装、注浆管浆锚及节点现浇形成整体结构体系.阐述了该体系构件工厂化生产的施工工艺和注意事项.重点介绍了台模加工与安装、钢筋与注浆管加工、钢筋骨架及网片绑扎、注浆管及安装预留预埋、混凝土浇筑等施工工艺.     

基于改进人口迁移算法的输电网扩展规划

输电网扩展规划是一个非常复杂的大规模组合优化问题,对比提出了一种改进人口迁移算法的求解方法.标准人口迁移算法在求解过程中搜索容易陷入局部最优解和后期收敛时间较长等问题,针对以上缺点,对算法的迭代初始化、种群生成策略以及参数设置进行了改进,将遗传算法的最优保留思想引入到算法中,提高了算法搜索全局最优解的能力与收敛到最优解...