Carrying Capacity and Coupling Coordination of Water and Land Resources Systems in Arid and Semi-arid Areas: A Case Study of Yulin City, China

Quantitatively assessing the carrying capacity of water and land resources systems in arid and semi-arid areas is crucial for achieving the 2030 Sustainable Development Goals.In this work,taking Yulin City in China as a case study and employing the Criteria Importance Through Intercriteria Correlation(CRITIC)method,a modified model of coupling degree was developed to evaluate the car-rying capacity of water and land resources systems endowment and utilization,as well as their coupling coordination degree from 2013 to 2020.Our findings indicate that the water and land resources of Yulin are diminishing due to declines in agriculture,higher industrial water use,and wetland shrinkage.However,reallocating domestic water for ecological sustainability and reducing sloping farmland can mitigate this trend of decline.Temporally,as the coupling coordination between water and land resources system endowment in Yulin continuously improved,the coupling coordination between water and land resources system utilization first decreased and then in-creased with 2016 as the turning point.Spatially,the carrying capacity of water and land resources systems,the coupling coordination degree between water and land resources system endowment,and the coupling coordination degree between water and land resources system utilization in Yulin exhibited the same pattern of being higher in the six northern counties than in the six southern counties.Improving the water resources endowment is vital for the highly efficient use of water and land resources.

Spatio-temporal evolution of the coordinated development of high-tech industry agglomeration and resource-environmental carrying capacity in the Yellow River Basin

Under the background of new infrastructure,the Yellow River Basin’s superior growth cannot be separated originating with the synergistic effect of scientific and technological inventiveness and ecological civilization construction.In light of the coupling coordination analysis of the coordination effect of provincial high-tech industry agglomeration and resource carrying capacity in the Yellow River Basin from 2009 to 2021,The evolution of the geographical and temporal pattern of development was investigated using the Moran index and kernel density estimation.The results show that the agglomeration of high-tech industries in the Yellow River Basin presents a development trend of seek improvement in stability,and there is a good coupling and coordination throughout the progression of scientific and technological innovation and the loading capacity of the resource,from the viewpoint of a time series.From the perspective of spatial pattern distribution,the whole basin aims at the lower reaches,accelerates the optimization of digital industry and promotes Yellow River Basin development of superior quality through innovation support and increase of input,and based on policy guidance.

One-Pot Synthesis of Co-Based Coordination Polymer Nanowire for Li-Ion Batteries with Great Capacity and Stable Cycling Stability

Nanowire coordination polymer cobalt–terephthalonitrile(Co-BDCN) was successfully synthesized using a simple solvothermal method and applied as anode material for lithium-ion batteries(LIBs). A reversible capacity of 1132 mAh g^(-1) was retained after 100 cycles at a rate of 100 mAg^(-1), which should be one of the best LIBs performances among metal organic frameworks and coordination polymers-based anode materials at such a rate. On the basis of the comprehensive structural and morphology characterizations including fourier transform infrared spectroscopy,~1 H NMR,^(13)C NMR, and scanning electron microscopy, we demonstrated that the great electrochemical performance of the as-synthesized Co-BDCN coordination polymer can be attributed to the synergistic effect of metal centers and organic ligands, as well as the stability of the nanowire morphology during cycling.

The Coordination Effect of Marine and Land Resources Carrying Capacity of Coastal Areas in China

The carrying capacity of marine and land resources is one of the indicators to measure the sustainable development level of coastal areas,reflecting the supporting capacity of the ecological environment for human activities and the impact of human activities on the regional environment.This paper establishes an evaluation index system to determine the evaluation value of the carrying capacity of marine and land resources in China’s coastal areas,the evaluation index of marine and land resources supply capacity(economic and social development demand)subsystem,and the degree of coordinated development of the subsystems in 11 coastal areas from 2006 to 2017.The results showed that the average supply and demand capacity of the two subsystems in each region is not high;the average demand level of economic and social development is higher than the supply capacity of marine and land resources;the carrying capacity of marine and land resources is slightly overloaded in most areas;the collaborative development between the supply and demand subsystems is barely coordinated with moderate imbalance;most regions need to move in the direction of green development to ensure the supply capacity of marine and land resources.

Collaborative supply chain planning under dynamic lot sizing costs with capacity decision

Studies show that supply chain cooperation improves supply chain performance. However, it remains a challenge to develop and implement the realistic supply chain cooperation scheme. We investigate a two-echelon supply chain planning problem with capacity acquisition decision under asymmetric cost and demand information. A simple negotiation-based coordination mechanism is developed to synchronize production/order strategies of a supplier and a buyer. The coordination scheme shows how the supplier and the buyer modify their production and order policy in order to find a joint economic lot sizing plan, which saves the overall supply chain cost. The allocation of the cooperation benefit is determined by negotiation. Due to the complexity of the multiple periods, multiple level supply chain lot sizing with capacity decision, a heuristic algorithm is developed to find coordination solutions. Finally, the results of the numerical study indicate the performance of supply chain coordination scheme.

Interference Coordination for Secrecy Enhancement in Random Wireless Networks

The co-channel interference modeling is vital for evaluating the secrecy performance in random wireless networks,where the legitimate nodes and eavesdroppers are randomly distributed.In this paper,a new interference model is proposed from the userdominant perspective.The model can provide a better analytical assessment of secrecy performance with interference coordination for the presence of eavesdroppers.The typical legitimate is assumed to be located at the origin,and chooses the closest base station(BS) as its serving BS.The field of interferers is obtained by excluding the desired BSs(including the serving BS and its cooperative BS(s)).In contract with the exiting interference model,it is assumed that desired BSs and interferers belong to the same Poisson Point Process(PPP),and eavesdroppers are distributed according to another independent PPP.Based on this model,the average secrecy transmission capacity is derived in simply analytical forms with interference coordination.Analysis and simulation results show that the secrecy performance can be significantly enhanced by exploiting interference coordination.Furthermore,the average secrecy transmission capacity increases with increasing number of cooperative BSs.

Exploring the Goal Synergy between the Ecological Carrying Capacity of Miyun District and the Development of the Ecological Home-stay Industry in Beijing

Green construction in culture and environmental protection will be the development trend in a long run,the urban and suburban area will be ecologically developed as well.Rural revitalization must adhere to the position of historical progress theory and modern concepts,innovate spatial layout,optimize ecological resources,and appropriately determine its historical significance and sustainable development responsibility with reasonable value orientation and environmental ecological carrying capacity for local ecological construction.In order to achieve this responsibility,the authors must expand the dimensions to consider more relevant factors.The guarantee of ecological carrying capacity is an important means to ensure the promotion of ecological civilization.This paper aims to integrate and regulate the goal synergy of the cultural development of the home-stay industry in Miyun District of Beijing by means of the innovative model of sustainable economic development of cultural ecology,ecological people,ecological health preservation and rich home-stay ecological elements.Assuming that the role of the former in promoting the latter can be expanded,then in the range of ecological and cultural towns(conceptual model)that maintain a certain tolerance of ecological carrying capacity,as a characteristic home-stay industry in Miyun,there will be some effective growth,so the integration and development of multiple cultural genes and elements must be the ecological and cultural town model under the enhanced multi-factor aggregation effect,(See the ecological environment carrying capacity development goal A:A=B12345+C1234567 later).This article will explain that the development goals of Miyun's ecological culture and the ecological homestay industry are coordinated,and the two are mutually raised in the same direction.

基于陆海统筹的资源环境承载力评价方法探讨

海洋、海岸带蕴含的资源丰富,与人类生存发展息息相关。近年来,随着海洋经济的迅速增长,自然岸线和滨海湿地面积减少、生物多样性降低、典型生态系统受损、近岸海域灾害频发、渔业资源减少等问题日益显现。如何从战略高度提升海洋经济,开发和保护并举,确保海岸带、海洋资源取用合理是新时代的重要课题。陆地和海洋是生态系统不可分割的组成部分,开展陆海统筹的资源环境承载力评价是衡量区域经济发展与生态环境是否协调可持续发展的有效途径。文章系统地梳理了承载力概念的发展历程,对比了常用的海洋资源环境承载力评价方法,初步构建了陆海统筹的资源环境承载力评价指标体系,并提出使用熵值法来确定指标权重,采用状态空间评价模型或TOPSIS模型进行承载力综合评价,可以体现陆地和海洋相互影响、相互制约的关系,并具有较强的可操作性,评价结果可以反映区域资源环境承载力的空间差异或随时间变化情况,能够为海洋和海岸带保护利用提供有效借鉴。

黄河流域生态承载力及人地关系可持续发展——基于异速生长模型的研究

厘清黄河流域人口与土地异速生长关系的空间分异特征与时空变化趋势对协调黄河流域人地关系,提高黄河流域生态承载力有重要借鉴意义。文章引入生物学异速生长模型对黄河流域生态承载力的人地协调关系进行研究。结果表明:第一,黄河流域城市主要以正异速二级,土地明显扩张类型为主,其在黄河流域上中下游占比分别为44.45%、52.94%和84.61%。第二,以2015年为分界点,黄河流域异速生长系数有显著的阶段性转换特征。2015年前黄河流域异速生长系数总体呈现下降趋势,2015年后则小幅提升。从2013年开始,黄河上游异速生长类型由正异速转为负异速,黄河中下游一直为正异速生长。第三,黄河上中下游异速生长系数的全局莫兰指数均为负数,异速生长系数呈现高低集聚分布态势。第四,从影响土地和人口数量变化的因素上看,工业化水平、金融发展对土地扩张和人口增长均有正向促进作用,政府干预可促进人口增长,但教育资源不足成为抑制人口增长的重要因素。从而得到以下政策启示:在提高城市土地利用率的基础上,上中下游城市群均应充分利用市场机制对城市建设用地进行资源配置,进一步提高城市建设用地的利用效率,积极推进土地的二次开发和利用,优化城市土地的利用结构,积极发挥城市集聚效应,合理规划城市增长边界。

北京高质量发展与城市综合承载力耦合协同研究

为探究北京高质量发展与城市综合承载力的协同关系问题,本文结合北京高质量发展和城市综合承载力构建了复合评价指标体系,并运用耦合协调度模型定量测度2005—2020年两个系统综合水平以及耦合协调关系。研究表明:北京高质量发展指数和城市综合承载力指数总体呈现增长态势,但目前还处于中低水平;北京高质量发展系统和城市综合承载力系统的耦合协调度从中度失调耦合升级为初级协调耦合,呈现稳定上升态势,但距离优质协调耦合还有一定的提升空间。因此,北京要科学配置资源要素,不断提高城市综合承载力,深入推进京津冀区域协同发展,实现北京经济社会高质量发展。

黄河“几”字弯都市圈资源环境承载力与经济发展耦合协调研究

在生态文明建设理念下,如何实现生态脆弱区资源环境与经济的协调发展,已成为我国亟待解决的问题之一。以典型生态脆弱区黄河“几”字弯都市圈21个地级市为例,基于2005年、2010年、2015年、2020年的资源环境与经济发展数据,运用熵权TOPSIS法分析资源环境承载力状况,并引入耦合协调度模型揭示资源环境承载力与经济发展水平耦合协调关系及其时空演变特征,结果表明:黄河“几”字弯都市圈资源环境承载力呈波动上升趋势,区域差异显著;资源环境承载力与经济发展水平的耦合协调度整体逐渐趋向于更高程度的耦合;通过莫兰指数分析发现,黄河“几”字弯都市圈资源环境承载力与经济发展水平耦合协调度为显著空间正相关。

产能约束下考虑碳税和低碳偏好的供应链新/再制造品减排决策和协调

为了研究碳税、低碳偏好和产能约束对碳减排的影响,建立了双寡头制造商和零售商组成的二级供应链博弈模型。在分散情形下利用Stackelberg理论对比分析了3种不同决策情形来研究产能约束下低碳偏好和碳税对新/再制造产品定价、减排和利润的影响,接着以联合决策的最优解为基准设计契约来实现供应链的Pareto优化。结果表明,产能约束下的低碳偏好和碳税政策均可有效促进制造企业的碳减排行为,同时使供应链成员提高其定价策略;产能增大时,制造商总会提高其产品碳减排量,并根据减排成本系数大小决定价格策略调整方向;联合决策下的产品碳减排量和供应链整体利润更优,设计的协调费用—利润分享契约可以实现产能约束下的供应链Pareto优化。

计及灵活经济环保运行的火电-飞轮储能系统容量配置与调频参数协同优化

提出了一种计及灵活经济环保运行的火储系统容量配置与调频参数协同优化方法。首先,设计了一种基于低通滤波自动分配火储功率和考虑储能荷电状态自恢复的火储联合一次调频协调控制策略;综合考虑系统调频性能、投入运行成本、污染物排放等,建立了火储容量配置与调频参数协同优化模型,并给出了基于粒子群算法的求解方法。最后,以某火储系统为例进行仿真验证。结果表明:协调控制策略和协同优化方法具有有效性。

新能源大基地风光储容量协调优化配置

大型新能源基地需要协调配置风光火储容量以满足外送要求,其中火电容量及外送通道的容量通常预先确定,从而风电、光伏、储能的容量配置成为影响新能源外送效果的重要因素。为此,针对大型新能源基地,研究了风光储容量优化配置问题,提出了基于新能源外送可靠性的容量配置方法。基于需求侧的负荷曲线,提出了一种聚类方法来优化直流通道的计划传输功率;基于直流计划功率,提出了衡量新能源外送可靠性的送电置信概率指标;基于送电置信概率等约束,构建了风光储容量优化配置的基本规划模型。为了进一步保证在不同的场景下新能源能可靠外送,在基本规划模型的基础上加入场景分布不确定性,提出了风光储容量配置的分布鲁棒规划模型。考虑到分布鲁棒约束包含整数变量,提出了一种迭代算法用于该分布鲁棒规划模型的求解。实际算例验证了所提方法的有效性。

2016-2021年江西省医疗服务能力与经济发展水平的耦合协调度及影响因素分析

[目的]探索江西省医疗服务能力与经济发展水平之间的相互作用关系,提出优化策略,促进二者协调发展。[方法]构建江西省医疗服务能力发展水平和经济发展水平评价指标体系,采用耦合协调理论分析江西省医疗服务能力与经济发展的耦合协调度,运用灰色关联分析法进一步分析协调发展的影响因素。[结果]2016-2021年江西省各市医疗服务能力与经济发展耦合协调度变化均呈小幅波动,在研究时段内数值变化不大;医疗机构数和医院病床使用率与耦合协调度的灰色关联度排名稳居前二,分别为0.796和0.764,属于强关联度。[结论]江西省医疗服务能力整体超前于经济发展水平;江西省各市医疗服务能力与经济发展耦合协调度差异较大;江西省医疗服务能力与区域经济协调发展受多因素影响。

考虑气水打捆外送的气水协调双层优化模型

针对水电“丰多枯少”资源特性给电力系统调峰、输电通道利用率造成的挑战,提出一种考虑气水打捆外送的气水协调双层优化方法。首先,分析川渝地区气水融合发展策略,提出气水打捆外送模式;其次,建立考虑气水打捆外送的气水协调发电双层优化模型。上层模型以考虑气电投资成本的系统年总利润最大化为目标,实现气水协调的容量优化配置,下层模型以年运营收益最大化为目标,实现气水协调优化运行;然后,采用混沌粒子群算法结合CPLEX求解器对模型进行求解,利用Shapley值法实现气水打捆外送的利润分配;最后,以某区域电力系统为例进行算例分析,结果表明所提模型可优化配置气电装机容量,实现气水协调优化运行,缓解水电季节性矛盾造成的调峰困境,提升外送通道利用率。

关于加强我国实物地质资料统筹保管工作的思考

实物地质资料是地质勘探工作形成的宝贵资源,确保重要实物地质资料安全妥善保管是实现其潜在价值有效保存和高效利用的重要保障,而如何改进日益增长的重要岩芯保管需求和有限的库房建设之间的矛盾,是当前我国实物地质资料保管工作面临的重要问题。笔者等系统总结了近年来我国实物地质资料保管工作在制度建设、库房建设等方面取得的重要成果,分析了当前面临的主要问题,研究并提出了我国实物地质资料统筹保管工作的总体布局、机制建立等方面的建议,为提升我国实物地质资料统筹保管能力提供参考。

配电网储能设备运行策略与容量的协调优化

随着风电、光伏发电等新能源大规模并网,配电网对电能质量和电压稳定的要求越来越高。然而,分布式电源及储能设备接入电网后将对配电网造成一定的影响,合理利用储能设备是提升配电网供电质量和降低电能损耗的有效手段。为了提高储能设备的运行效率和可靠性,基于电池管理系统、能量管理系统、最大功率点追踪、预测模型和能量回收等控制策略显得尤为重要。这些策略能够确保储能设备的正常运行、实时监测、调整充放电状态、优化能源利用、提高转化效率以及实现能源的可靠供应。由于配电网储能设备的正常运行与储能容量有着直接关系,开展配电网储能设备运行策略与容量的协调优化对于推动储能科学的发展具有重要意义。

考虑线路能力协调利用的车流径路与配空组织优化模型

为提高铁路整体通过能力,均衡利用路网中各线路,应对愈发波动的运输市场,开展考虑线路能力协调利用的重空车流协调优化模型研究。首先,对线路能力协调利用的实现机理进行研究,在考虑流平衡约束、配空约束、线路能力约束基础上,增加考虑铁路线路能力协调利用约束,同时在优化目标中增加紧张线路的使用成本,构建考虑线路能力协调利用的重空车流组织优化模型,以实现在优化车流径路与空车调配方案的同时兼顾铁路线路的协调利用。其次,在此基础上设计拉格朗日松弛算法,对线路能力约束与能力协调性约束松弛,将原问题分解为车流径路子问题、空车调配子问题和虚拟车流量子问题,进而降低了问题求解难度。再次,通过5组算例对算法的有效性进行验证,案例结果说明,设计的拉格朗日松弛算法在求解大规模算例时效率优于商业求解软件Gurobi。最后,设计了包含36个车站56条线路的实际案例,算法求解耗时4757.7 s,运输组织综合成本为29535803元,通过对求解结果分析,与传统优化模型相比该模型优化结果在运输成本仅增加1.56%的前提下能力紧张的线路数量由17条缩减至12条,降低了29.4%,同时空车调配符合就近配空的原则。研究结果表明,该模型可以有效缓解铁路能力紧张情况,促进铁路线路能力的协调利用。

合成生物可降解塑料PBAT催化剂的研究进展

重点介绍了合成PBAT催化剂领域的研究进展,分析了不同体系钛基催化剂的优势与不足,并简述了目前合成PBAT过程中酯化与缩聚阶段的催化反应机理,提出合成PBAT催化剂的改进措施与研究方向,指出研制高效环保的催化剂是未来可生物降解聚酯行业的主流发展趋势。