Joint Beam Scheduling and Power Optimization for Beam Hopping LEO Satellite Systems

Low earth orbit(LEO) satellite communications can provide ubiquitous and reliable services,making it an essential part of the Internet of Everything network. Beam hopping(BH) is an emerging technology for effectively addressing the issue of low resource utilization caused by the non-uniform spatio-temporal distribution of traffic demands. However, how to allocate multi-dimensional resources in a timely and efficient way for the highly dynamic LEO satellite systems remains a challenge. This paper proposes a joint beam scheduling and power optimization beam hopping(JBSPO-BH) algorithm considering the differences in the geographic distribution of sink nodes. The JBSPO-BH algorithm decouples the original problem into two sub-problems. The beam scheduling problem is modelled as a potential game,and the Nash equilibrium(NE) point is obtained as the beam scheduling strategy. Moreover, the penalty function interior point method is applied to optimize the power allocation. Simulation results show that the JBSPO-BH algorithm has low time complexity and fast convergence and achieves better performance both in throughput and fairness. Compared with greedybased BH, greedy-based BH with the power optimization, round-robin BH, Max-SINR BH and satellite resource allocation algorithm, the throughput of the proposed algorithm is improved by 44.99%, 20.79%,156.06%, 15.39% and 8.17%, respectively.

Distributed Resource Allocation via Accelerated Saddle Point Dynamics

In this paper,accelerated saddle point dynamics is proposed for distributed resource allocation over a multi-agent network,which enables a hyper-exponential convergence rate.Specifically,an inertial fast-slow dynamical system with vanishing damping is introduced,based on which the distributed saddle point algorithm is designed.The dual variables are updated in two time scales,i.e.,the fast manifold and the slow manifold.In the fast manifold,the consensus of the Lagrangian multipliers and the tracking of the constraints are pursued by the consensus protocol.In the slow manifold,the updating of the Lagrangian multipliers is accelerated by inertial terms.Hyper-exponential stability is defined to characterize a faster convergence of our proposed algorithm in comparison with conventional primal-dual algorithms for distributed resource allocation.The simulation of the application in the energy dispatch problem verifies the result,which demonstrates the fast convergence of the proposed saddle point dynamics.

Stratigraphic Data and Groundwater Resources in the Coastal Sedimentary Basin of the Pointe-Noire Region (Republic of Congo)

The synthesis of geological and petroleum research undertaken in the coastal Sedimentary Basin of the Pointe-Noire region enabled the establishment of a lithostratigraphic scale. It has been observed that the order in which the series observed in outcrop and those encountered by deep wells succeed each other has allowed a value to be given to this relative scale. The study area corresponds to a longitudinal tectonic accident, fault or flexure. It belongs to the Cretaceous and Tertiary coastal sedimentary basin covered by the Plio-Pleistocene age formations (series of circuses), formed of highly permeable sands comprising multiple resistant horizons that store large bodies of water whose reserves are considered very important. Hydrographic network is composed of four main basins with a mediocre size. The quality of this groundwater is considered to be satisfactory for household consumption, but the sustainable management of these reserves requires constant checks on their quality as well as on the level of the reserves. All these resources put the agglomeration of Pointe-Noire close to large exploitable water reserves that meet the need for drinking water, even if, on the whole, the agglomeration is still experiencing many difficulties in terms of its drinking water supply.

System resource constraint theory

The System Resource Constraint Theory intends to research growth of economy under different classes of system resource constraint. By analogy between ecology system and economic system, from the angle of total nature resource, total supply ability and total market volume, the theory focuses on the constraint condition and development characteristic of economy as well as the various game characteristics among economies such as independence, competition, and joint competition. According to the math deduction, the author finds that Logistic model is relative with Marthus＇s model and Zero-growth model.

Assessing Water Resources Access of Nouhao Sub-Basin, Burkina Faso

Water resource access in the Nouhao sub-basin, assessed based on the availability of drinking water mobilization facilities, the availability of water for uses and the quality of drinking water, revealed that in 2017 the basin was covered by 1249 modern water point, main drinking water sources. On average, the sub-basin shows a ratio of 271 users per drinking water point. Communal level shows some disparity with Bittou recording the highest number of people per drinking water point, i.e., around 537. Water that can be captured in the entire sub-basin meets only 42% of the total water needs from the three mains uses: irrigation, domestic consumption and livestock. The highest demander among these uses is Irrigation with 75% of the need, i.e., approximately 12,859,995 m3. Water in 33% drinking sources of this sub basin is of poor quality. Arsenic, one of the quality parameters studied, is found in some communes of the sub-basin. 11% of the water points in Bissiga are arsenic polluted making this commune the most arsenic contaminated location. The vulnerability maps deducted from lack of water for uses;lack of drinking water works and poor water quality shows so, the exposure level of the sub-basin’ communes to some potential risks related to low water resources access.

“拼凑式合作”:资源约束下基层治理的“权宜之计”?

合作治理是否只是主体间的合作?为了把支撑合作的非主体要素纳入基层治理分析范畴,揭开合作治理的过程黑箱,论文首先将合作治理的本质界定为资源的合作,接着引入拼凑理论,探究G市3个城乡社区资源拼凑的共性机制,进而讨论由此产生的“拼凑式合作”究竟是资源约束下基层治理的“权宜之计”还是“长久之计”。研究发现,积分驱动下的治理资源拼凑行为由制度拼凑、人力拼凑、场景拼凑、金融拼凑、市场拼凑构成,其内部存在的补缺关系、互构关系和紧张关系共同形塑出G市资源拼凑的复杂机制。在此基础上,论文借助共生理论评估合作效果,通过案例的横向比较,指出依靠单一主体提供资源的偏利共生型“拼凑式合作”,可能陷入治理资源耗竭的窘境,是资源约束下基层治理的“权宜之计”;而强调治理资源内外互补、循环互动的互惠共生型“拼凑式合作”,成为基层治理的“长久之计”,为理解合作治理提供了一种新的视角。

有机硅高沸物催化裂解技术进展

催化裂解技术可高效低能耗地资源化处理利用有机硅高沸物,有机硅高沸物催化裂解技术根据所用催化剂不同可分为氯化铝基催化裂解技术、有机胺基催化裂解技术、钯磷配位化合物基催化裂解技术、磷酸盐基催化裂解技术、过渡金属及其化合物基催化裂解技术、分子筛和活性炭基催化裂解技术等。对这些技术的特点、发展现状和趋势进行了研究,为有效利用这些技术对有机硅高沸物通过催化裂解实现资源化处理利用提供技术支持。研究表明,有机胺基催化裂解技术相对其他技术具有其他技术无可比拟的技术优势,是未来有机硅高沸物催化裂解技术发展的一个趋势和热点。

考虑配电网灵活性的分布鲁棒优化调度

针对新能源占比不断增加导致的配电网线路过载和灵活性不足问题,提出一种考虑配电网灵活性的分布鲁棒优化调度方法。首先,考虑节点灵活性资源的功率支撑作用、网络灵活性资源智能软开关的系统潮流优化,提高配电网灵活运行能力;其次,考虑供需平衡和功率传输能力提出了灵活性裕度和线路容量裕度灵活性评价指标;然后,以灵活性裕度、线路容量裕度最优和运行成本最小为目标,构建基于数据驱动的两阶段分布鲁棒优化模型,通过列与约束生成算法对模型求解。最后,通过算例仿真验证了所提模型对提升配电网经济灵活运行的有效性。

中国各地区光伏发电平价上网成本效益综合分析

文章针对我国各地区光伏资源、上网电价、初始全投资、弃光率不同的情况,构建了光伏经济性评价模型;分析了各地区光伏发电平价上网情况;并计算出各地区满足基准收益率的最低上网电价和最高初始全投资。结果表明:我国光伏经济性存在明显的地域性差异,考虑“弃光”的情况下,全国共有15个地区无法实现平价上网,但其中大部分地区已接近平价上网;部分光伏经济性高的地区能以低于标杆电价0.05元/(kW·h)的电价实现平价上网。研究结果有助于光伏项目的投资决策以及相关政策的制定。

An Efficient Method to Estimate Admittance of Black-boxed Inverter-based Resources for Varying Operating Points

Traditional analytical approaches for stability assessment of inverter-based resources(IBRs),often requiring detailed knowledge of IBR internals,become impractical due to IBRs’proprietary nature.Admittance measurements,relying on electromagnetic transient simulation or laboratory settings,are not only time-intensive but also operationally inflexible,since various non-linear control loops make IBRs’admittance models operating-point dependent.Therefore,such admittance measurements must be performed repeatedly when operating point changes.To avoid time-consuming and cumbersome measurements,admittance estimation for arbitrary operating points is highly desirable.However,existing admittance estimation algorithms usually face challenges in versatility,data demands,and accuracy.Addressing this challenge,this letter presents a simple and efficient admittance estimation method for blackboxed IBRs,by utilizing a minimal set of seven operating points to solve a homogeneous linear equation system.Case studies demonstrate this proposed method ensures high accuracy across various types of IBRs.Estimation accuracy is satisfying even when non-negligible measurement errors exist.

Secure resource allocation against colluding eavesdropping in a user-centric cell-free massive multiple-input multiple-output system

We investigate the resource allocation problem of a cell-free massive multiple-input multiple-output system under the condition of colluding eavesdropping by multiple passive eavesdroppers.To address the problem of limited pilot resources,a scheme is proposed to allocate the pilot with the minimum pollution to users based on access point selection and optimize the pilot transmission power to improve the accuracy of channel estimation.Aiming at the secure transmission problem under a colluding eavesdropping environment by multiple passive eavesdroppers,based on the local partial zero-forcing precoding scheme,a transmission power optimization scheme is formulated to maximize the system’s minimum security spectral efficiency.Simulation results show that the proposed scheme can effectively reduce channel estimation error and improve system security.

基于PRS的遥感图像地物信息提取模型

点源理论(PRS)是一种面向应用需求的集中信息处理方式。不同尺度、不同分辨率的点都是一定的综合信息场,是客观世界的真实反映。本文在数字图像处理过程中引入点源理论,探讨针对地物空间信息应用服务的遥感信息分析和处理模型,讨论基于点源的图像构造、知识构造及地物模型建造过程,给出基于点源的遥感图像地物提取流程。

基于AHP-理想点法的空间目标监视资源调度效能评估

在空间目标日益增多和监视资源有限的背景下,为了寻找合理的空间监视资源调度策略从而提高调度效能,提出了基于层次分析(AHP)-理想点法的空间目标监视资源调度效能评估方法。该方法在编目维持任务场景中,建立了空间目标监视资源调度效能评估指标体系,基于AHP法和理想点法评估编目最大化、重点任务优先、重点目标优先和搜索优先四种策略下的调度效能并进行排序。仿真结果表明,编目最大化策略在编目维持任务场景中实现了调度效能最大化。该方法相比传统的AHP指标综合法更加客观,对实际调度和装备应用具有指导意义。

近地面机载激光雷达在森林资源调查监测中的应用

从近地面机载激光雷达工作原理出发,分析该技术在林业调查中获取地形地貌、地表植被覆盖信息方面存在的优势,结合自主研发的点云数据处理软件所涉及的方法,描述了从机载激光雷达数据获取单木信息、林木树高、冠幅、株数和郁闭度的技术理论,最后根据机载激光雷达在林业上的应用情况,与传统的林业调查监测技术进行比较,得到当前机载激光雷达在调查树高、郁闭度、株数等方面有自身优势,可以替代部分传统工作,但在预测树高胸径模型、蓄积量调查、点云数据处理算法等方面仍然有待技术和理论进一步完善和改进的结论。

考虑配电网灵活性不足风险的分布鲁棒低碳优化调度

双碳目标下高占比可再生能源接入配电网,其不确定性导致配电网灵活性需求剧增。为提高配电网灵活运行能力,减少碳排放,提出考虑配电网灵活性不足风险的分布鲁棒低碳优化调度方法。首先,考虑智能储能软开关作为网络灵活性资源,以减少线路阻塞并提高节点灵活性资源网络互济水平。引入功率传输分布因子表征灵活性供需在线路上的传输情况,提出资源灵活性裕度指标和线路容量裕度指标,评估配电网灵活性。其次,基于条件风险价值理论,推导出当资源-线路裕度不足时给配电网造成的灵活性不足风险。然后,考虑风光出力的不确定性与相关性,运用Frank-Copula函数生成风光出力场景,采用改进的KL散度构造概率分布模糊集。以综合运行成本最低为目标,建立分布鲁棒优化调度模型,采用列与约束生成算法求解。最后,通过算例验证表明,智能储能软开关的加入减少了线路阻塞的情况,所提方法能够减少配电网碳排放和灵活性不足风险。

青岛大学附属妇女儿童医院多院区药事管理一体化模式的实践与成效探讨

目的:探讨多院区药事管理一体化管理方法,为提升医院药事管理质量提供参考。方法:以“多院区一体化”管理理念为指引,通过“总院垂直化、分院扁平化”管理策略,建立药师人力资源管理一体化、药学信息管理一体化、药事质量控制一体化的多院区一体化药事管理模式,包括制定《积分制管理办法》和《科研管理办法》,统一宣传平台和管理平台,建立标准化的药事质量管理体系。结果:通过实施药师人力资源一体化管理模式,优化了各院区人员结构,提升了药师队伍水平,有效配置了药师资源,并拓展了教研工作;通过实施药学信息一体化管理模式,提高了科室凝聚力和学科知名度以及管理效能;通过实施药事质量控制一体化管理模式,降低了抗菌药物使用率和次均药费,提升了药物不良反应监测水平。结论:从药师、药学信息、药事质控3个方面实施一体化管理,药师资源实现了最大化利用,各院区信息实现互通共享,各院区药事质量的均一性得到保障,有效促进了医院多院区同质化和一体化发展。

浅谈农业面源污染对水资源的影响与控制措施

农业面源污染是指由农业活动引起的非点源污染,其对水资源产生了广泛而深远的影响。本文通过综合分析相关文献和数据,探讨了农业面源污染对水资源的影响及其控制措施。研究发现,农业面源污染导致水体富营养化、农药残留、土壤侵蚀等问题,严重危害了水资源的质量及可持续利用的前景。为了解决这一问题,我们需要采取综合管理策略,包括建立农业环境保护法规、推行科学施肥技术、加强农药管理、实施水土保持措施等。通过这些措施的实施,可以减轻农业面源污染对水资源的影响,保障水资源的可持续利用。

红色资源地方性呈现的方向与路径——以四川广元为例

在红色资源开发中突出地方性,建立其与地方其他资源的关系,是将红色资源转化为地方发展资源的关键所在。以四川广元为例,发现寻找红色资源与交通、生态和历史等其他资源优势的内在契合点,是呈现红色资源地方性应当遵循的方向。以多方协力调动民众参与红色资源开发为基础,通过生活化场景凝聚集体情感、差异化开发直面市场需求、具象化载体凝练可感符号的路径,红色资源的地方性在建构红色主题的过程中变得更为鲜活。主动承接和融入区域发展战略,在区域文化整体性中凸显红色资源的地方特色,为开发红色资源提供新思路。

计及灵活性资源的分布式多微网配电系统定价策略

针对含灵活性资源的多微网配电系统,提出一种基于动态非合作博弈的多微网配电系统定价策略,以引导用户侧调整用电方式实现系统经济运行。提出一种双层不动点映射算法:在内层,分别建立微网和配电网的凸优化模型,采用交替方向乘子法对模型进行分布式求解,进而确定电网最优定价策略;在外层,建立灵活性资源用户响应模型,用户根据内层的定价策略调整原有需求量。引入不动点定理解释该博弈问题,并证明其均衡解的存在性、唯一性和收敛性。算例仿真结果验证了所提策略的适用性与有效性。

农业废弃物资源化利用的经济学研究

农业废弃物资源化利用是控制农业面源污染、促进农民增收、改善农村人居生活环境、提升农业生态产品供给能力以及保障国家粮食、食品和生态安全的有效途径,是实现农业绿色发展的重要内容和内在要求。本文从宏观和微观两个层面,构建了农业废弃物资源化利用的理论框架,为更好地推动农业废弃物资源化利用提供了理论支撑。当前,农业废弃物资源化利用中还存在综合利用率不高、市场化运作程度低、制度保障体系不健全等问题。为此,应加强农业废弃物资源化利用的市场化发展,健全并完善技术创新研发、资金投入、人才建设、政策支撑、组织保障等支撑保障体系,提升农业废弃物资源化综合利用率,更好地推动农业发展的绿色转型,形成绿色、低碳、循环的可持续农业发展模式,助力农业强国建设。