Two-Stage Optimal Scheduling of Community Integrated Energy System

From the perspective of a community energy operator,a two-stage optimal scheduling model of a community integrated energy system is proposed by integrating information on controllable loads.The day-ahead scheduling analyzes whether various controllable loads participate in the optimization and investigates the impact of their responses on the operating economy of the community integrated energy system(IES)before and after;the intra-day scheduling proposes a two-stage rolling optimization model based on the day-ahead scheduling scheme,taking into account the fluctuation of wind turbine output and load within a short period of time and according to the different response rates of heat and cooling power,and solves the adjusted output of each controllable device.The simulation results show that the optimal scheduling of controllable loads effectively reduces the comprehensive operating costs of community IES;the two-stage optimal scheduling model can meet the energy demand of customers while effectively and timely suppressing the random fluctuations on both sides of the source and load during the intra-day stage,realizing the economic and smooth operation of IES.

AOS中基于最优帧长的链路自适应联合优化方法

针对AOS中数据传输误码率高的问题,导致系统吞吐量低的问题,提出基于最优帧长的链路自适应联合优化方法。该方法以系统吞吐量最大化为目标,联合可变帧长,自适应编码调制和混合自动重传请求技术进行优化,根据信道状态信息分配下一帧传输最佳的帧长和编码调制方式,并对出错数据进行纠错和重传,最终提升系统吞吐量。仿真验证表明,与AMC-HARQ和AMC-ARQ方法相比,该方法在保证系统误帧率的同时,提高了系统的吞吐量。

基于RCMFME和AO-ELM的齿轮箱损伤识别策略

针对模糊熵只考虑信号的局部特征而忽略信号的全局特征,导致齿轮箱故障识别的准确率不佳的问题,提出了一种基于精细复合多尺度模糊测度熵(RCMFME)、天鹰优化器(AO)优化极限学习机(ELM)的齿轮箱故障诊断方法。首先,在精细复合多尺度模糊熵的基础上,对矢量的构造方式进行了改进,提出了能够同时考虑时间序列局部特征和全局特征的RCMFME方法;随后,利用RCMFME指标提取了齿轮箱振动信号的熵值,组建了故障特征向量;接着,利用AO算法对极限学习机的参数进行了自适应搜索,生成了参数最优的多类别分类器;最后,将训练样本的故障特征向量输入至AO-ELM分类模型中进行了模型训练,以构造性能最优的分类器,并实现了对齿轮箱测试样本的故障识别目的;利用两种齿轮箱振动数据集进行了实验,在识别准确率和识别稳定性方面,与相关的特征提取方法进行了对比。研究结果表明:采用基于RCMFME和AO-ELM的故障诊断方法能够分别取得100%和98%的分类准确率,平均识别准确率分别达到了100%和98%,优于精细复合多尺度全局模糊熵(RCMGFE)、精细复合多尺度模糊熵(RCMFE)、精细复合多尺度样本熵(RCMSE)。该方法具有显著的应用潜力。

Influence of two-stage harvesting on the properties of cold-pressed rapeseed(Brassica napus L.)oils

Rapeseed(Brassica napus L.)harvesting method is critical since it significantly determines the seed yield,oil quality,and industrial efficiency.This study investigated the influences of harvesting methods on the quality of cold-pressed rapeseed oil of two varieties.Oil color,peroxide value(POV),tocopherol content,fatty acid composition,and polarity of total polyphenols(PTP)contents of two rapeseed varieties in Huanggang and Xiangyang were compared through artificially simulated combined harvesting and two-stage harvesting.Results showed significant differences in the quality of rapeseed oil between the two harvesting methods.The red value(R-value),POV,total tocopherol contents,linoleic and linolenic acid content,and PTP content of the pressed rapeseed oil prepared by the combined harvesting method were about 27.6,5.7,15.8,2.0,0.5,and 28.6%lower than those of the oil produced from the two-stage harvesting method,respectively.Xiangyang and Huayouza62 performed better in the two regions and two varieties,respectively.To sum up,the rapeseed oil obtained 41–44 days after final flowering of combined harvesting,35 days after final flowering,and six days of post-ripening of the two-stage harvesting had the best quality.

Tourism Route Recommendation Based on A Multi-Objective Evolutionary Algorithm Using Two-Stage Decomposition and Pareto Layering

Tourism route planning is widely applied in the smart tourism field.The Pareto-optimal front obtained by the traditional multi-objective evolutionary algorithm exhibits long tails,sharp peaks and disconnected regions problems,which leads to uneven distribution and weak diversity of optimization solutions of tourism routes.Inspired by these limitations,we propose a multi-objective evolutionary algorithm for tourism route recommendation(MOTRR)with two-stage and Pareto layering based on decomposition.The method decomposes the multiobjective problem into several subproblems,and improves the distribution of solutions through a two-stage method.The crowding degree mechanism between extreme and intermediate populations is used in the two-stage method.The neighborhood is determined according to the weight of the subproblem for crossover mutation.Finally,Pareto layering is used to improve the updating efficiency and population diversity of the solution.The two-stage method is combined with the Pareto layering structure,which not only maintains the distribution and diversity of the algorithm,but also avoids the same solutions.Compared with several classical benchmark algorithms,the experimental results demonstrate competitive advantages on five test functions,hypervolume(HV)and inverted generational distance(IGD)metrics.Using the experimental results of real scenic spot datasets from two famous tourism social networking sites with vast amounts of users and large-scale online comments in Beijing,our proposed algorithm shows better distribution.It proves that the tourism routes recommended by our proposed algorithm have better distribution and diversity,so that the recommended routes can better meet the personalized needs of tourists.

Multi-source coordinated stochastic restoration for SOP in distribution networks with a two-stage algorithm

After suffering from a grid blackout, distributed energy resources(DERs), such as local renewable energy and controllable distributed generators and energy storage can be used to restore loads enhancing the system’s resilience. In this study, a multi-source coordinated load restoration strategy was investigated for a distribution network with soft open points(SOPs). Here, the flexible regulation ability of the SOPs is fully utilized to improve the load restoration level while mitigating voltage deviations. Owing to the uncertainty, a scenario-based stochastic optimization approach was employed,and the load restoration problem was formulated as a mixed-integer nonlinear programming model. A computationally efficient solution algorithm was developed for the model using convex relaxation and linearization methods. The algorithm is organized into a two-stage structure, in which the energy storage system is dispatched in the first stage by solving a relaxed convex problem. In the second stage, an integer programming problem is calculated to acquire the outputs of both SOPs and power resources. A numerical test was conducted on both IEEE 33-bus and IEEE 123-bus systems to validate the effectiveness of the proposed strategy.

两级AO-臭氧催化氧化-后置反硝化-BAF工艺处理焦化废水工程实例

焦化废水污染物成分复杂,难生物降解污染物占比大,某工程项目设计采用两级AO-臭氧催化氧化-后置反硝化-BAF工艺处理焦化废水,介绍了该工程的工艺流程及特点、设计参数和运行效果。运行结果表明,在系统来水COD质量浓度为5746~7283 mg/L,氨氮质量浓度为91.4~130.1 mg/L时,处理出水COD质量浓度为40~55 mg/L,氨氮质量浓度小于2 mg/L,出水稳定达到设计目标,有利于后续膜回用系统的正常运行。

A two-stage but time-saving reconstructive scheme to treat severe lower limb length discrepancy:Two case reports

Limb length discrepancy(LLD)is a common orthopedic condition that can result in significant functional impairment,pain,and cosmetic deformities.Current reconstructive techniques for severe LLD are primarily based on callus distraction,which is a time-consuming process that can lead to complications,such as significant infection,joint stiffness,and stress fractures.To reduce the therapeutic time and minimize the risk of complications,we investigated the use of vascularized bone flaps as a technical supplement to callus distraction in the reconstruction of short limbs.We present two cases of severe LLD in the upper and lower legs,in which a twostage reconstruction approach was used.In the first stage,external fixation was applied to the affected limb to correct the soft tissue length and convert the short deformity into a bone defect.In the second stage,the bone defect was reconstructed using bilateral(patient A)or unilateral(patient B)free vascularized fibula bone grafts.Both patients had complete survival of the fibular grafts without stress fractures,and bone consolidation took 8 months(patient A)and 4 months(patient B).Compared to the traditional callus distraction,the two-stage approach was found to be more time-saving and reliable.The entire reconstructive scheme required 18 and 4 months for patients A and B,respectively,whereas the traditional callus distraction required 41 and 17 months,respectively.These findings suggest that the use of vascularized bone flaps as a technical supplement for callus distraction may provide an effective and efficient alternative for the treatment of severe LLD.Further studies are needed to validate these results and assess the long-term outcomes of this approach.

A New Two-Stage Tunable Space-Time Adaptive Detector

In order to improve the rejection capability of mismatched interferer signals,a new two-stage detector is proposed under homogeneous scenarios with unknown covariance matrix,which is obtained by cascading the adaptive matched filter(AMF)detector and the enhanced RAO(EnRAO)detector.The new detector has constant false alarm performance,and the closed-form expression of probability of false alarm and probability of detection is derived.The performance of the new detector is assessed,and analyzed in comparison with other detectors.The results show that,the proposed detector can provide enhanced rejection capability in the case of mismatch,but the performance of the detector is slightly lost under the condition of matching.

气浮-微电解-两级AO-MBR-混凝处理果仁类食品废水的工程实例

针对某果仁食品废水果胶含量大、色度高、有机物浓度高等特点,设计采用曝气调节-气浮-铁碳微电解-混凝-两级AO-MBR-混凝沉淀组合工艺进行处理,介绍了该组合工艺的流程、主要设计参数及处理效果。进水COD、TN、TP的浓度分别为3468、59.13、13.23mg/L。废水经过该组合工艺处理后,COD、TN、TP的去除率可达到99.45%、93.40%、99.70%,出水水质优于《广东省水污染排放限值》(DB44/26-2001)第二时段一级排放标准。

简易双边跨关节外固定架对AO43C型Pilon骨折早期固定的疗效

目的探讨简易双边跨关节外固定架对AO43C型Pilon骨折早期固定的疗效。方法选取2021年3月至2022年4月在杭州市富阳中医骨伤医院手术的56例AO43C型Pilon骨折患者为研究对象,采用随机数字表法将患者分为简易双边跨关节外固定架组(简易外架组)和单边外固定支架组(单边外架组),每组28例。Ⅰ期临时固定时,简易外架组在跟骨和胫骨结节处置入斯氏针,安装连杆,组装成简易双边跨关节外固定架进行临时固定;单边外架组采用常规单边跨关节外固定架进行临时固定。观察并比较两组患者Ⅰ期手术时间、Ⅱ期手术时间、消肿时间及住院时间,围术期并发症发生情况及术后随访1年时足踝功能恢复情况[采用美国骨科踝-后足评分(AOFAS)评估]和骨折复位情况(采用Burwell-Charnley骨折复位评价系统评估)。结果简易外架组患者Ⅰ期手术时间明显少于单边外架组,差异有统计学意义(P<0.01);但两组患者Ⅱ期手术时间、消肿时间、住院时间、围术期并发症发生率、随访1年时AOFAS评分及Burwell-Charnley骨折复位优良率比较,差异均无统计学意义(均P>0.05)。结论与单边外固定支架相比,简易双边跨关节外固定支架不增加围术期并发症发生率及住院时间,不影响术后恢复,且操作简便、费用低廉,可安全应用于复杂Pilon骨折。

优化污泥回流方式对多级AO-MBR工艺的影响

采用处理水量为0.15 m^(3)/h的中试装置,开展多级AO-MBR工艺处理低C/N城市污水试验研究,通过优化污泥回流方式、溶解氧及污泥浓度控制等措施,降低高溶解氧污泥回流对前端生化池的影响,实现出水水质达到地表水准Ⅳ类标准(TN除外)。结果表明,在耦合MBR工艺的形式下,经过生化池多级回流能显著保证各反应区的溶解氧环境,保持各反应区的污泥浓度平衡,进一步提高出水水质。在水温低于12℃、进水TN质量浓度为23~33 mg/L时,采用回流方式4能稳定保证TN去除率达到60%以上,实现出水TN质量浓度达到10 mg/L左右;进水TP质量浓度为2~4 mg/L时,TP去除率达到85%以上,实现出水TP质量浓度低于0.3 mg/L的要求。

基于GJO特征量优选的AO-RF的变压器故障诊断模型

在变压器故障诊断过程中,进行合理的特征优选,将有助于提高诊断模型的诊断精度,为此,文中提出了一种基于金豺优化算法(golden Jackal optimization,GJO)特征量优选与AO-RF的变压器故障诊断模型。首先,采用GJO对构建的21维变压器油中溶解气体特征量进行优选;然后,根据GJO得到的特征优选结果,采用天鹰算法(aquila optimizer,AO)优化随机森林(random forest,RF)的变压器故障诊断模型对变压器故障进行诊断,并与不同特征量、不同故障诊断模型的诊断结果进行了对比。实验结果表明:GJO优选特征量相比21维原始特征、三比值法、无编码比值法以及AO优选特征量的故障诊断准确率可提高1.12%~25.78%,kappa系数可提高0.02~0.24;AO-RF故障诊断模型较RF、SVM、ELM、SSA-RF、WOA-RF、GJO-RF模型的诊断准确率可提高1.84%~15.86%,kappa系数可提高0.02~0.16,验证了所提方法的有效性和准确性。

Two-stage revision in periprosthetic knee joint infections

Periprosthetic joint infection(PJI)following total knee arthroplasty is one of the most catastrophic and costly complications that carries significant patient wellness as well as economic burdens.The road to efficiently diagnosing and treating PJI is challenging,as there is still no gold standard method to reach the diagnosis as early as desired.There are also international controversies with respect to the best approach to manage PJI cases.In this review,we highlight recent advances in managing PJI following knee arthroplasty surgery and discuss in depth the two-stage revision method.

水解酸化+A2/O+AO+芬顿氧化工艺处理工业园区污水

针对工业园区的污水排放企业种类较多、进水水量水质波动较大、污染物复杂且可生化性差、排放标准高的特征,以浙江省德清县某工业园区实际污水处理工程为对象,分析了水解酸化+A2/O+AO+芬顿氧化工艺处理以印染、食品制造、金属加工企业为主的废水排放的技术经济可行性.实践结果显示,出水水质的COD、NH_(3)-N、TN及TP能稳定达到《城镇污水处理厂主要染物排放标准》(DB33/2169—2018)中的限值,其余指标达到《城镇污水处理厂染物排放标准》(GB18918—2002)的一级A标准;工程投资金额为8200元/m^(3),实际直接运行成本为2.39元/m^(3).

MBBR耦合多段AO工艺在大型市政污水处理厂的运行初探和实践成效

新建城市污水处理厂或提标改造老旧污水处理厂普遍存在出水水质差、污染物负荷与占地面积等不可调和的矛盾,基于纵向扩大池容会增加建设成本、高负荷运行具有超标风险,因此,急需一种污泥/容积负荷高、运行稳定、操作简单的污水处理新技术。对此,某大型市政污水处理厂利用移动床生物膜反应器(MBBR)泥膜共混技术提高生化池有效污泥浓度、实现功能微生物的强化和富集,耦合多段AO工艺,经历雨/旱、夏/冬季,已稳定运行227 d,当进水COD_(Cr)、氨氮、TN质量浓度分别为277.97、34.92、45.95 mg/L,对应出水质量浓度分别降低至12.68、0.33、7.55 mg/L,MBBR挂膜前后的氨氮污泥负荷为0.011、0.015 g氨氮/(g MLSS·d)、TN污泥负荷为0.014、0.020 g TN/(g MLSS·d)。系统稳定运行期间,好氧Ⅰ段氨氮硝化速率为7.27 mg/(L·h)、缺氧Ⅰ段NO-3-N还原速率为3.48 mg/(L·h)。结果表明,通过负载微生物和游离污泥的交互作用,寻求复杂微生物群落功能的强化和调控,可以设计出更加合理、高效的污水处理新工艺。

AO+芬顿反应池+BAC组合工艺处理电厂循环外排水的应用

某电厂循环外排水主要来源于电厂循环水系统中凝汽器不断循环,使机组降温的水。有可生化性较差、有机物浓度较低、硬度较大等特点,某电厂的综合污水处理厂采用AO+芬顿反应池+BAC组合工艺处理此污水,出水水质执行《城镇污水处理厂污染物排放标准》(GB18918-2002)一级A排放标准,结果显示,AO+芬顿反应池+BAC组合工艺能使出水稳定达到标准。

分段进水多级AO应用于高出水标准市政污水处理厂工程及运行分析

山东省某市政污水处理厂迁建项目迁建后污水厂总处理规模为25×10^(4)m^(3)/d,设计二级处理采用分段进水多级AO,深度处理采用“高效澄清池+Ⅴ型滤池+臭氧催化氧化”的组合。设计出水标准为地表水准Ⅳ类,其中TN<15 mg/L。2022年山东省发布《山东省城市排水“两个清零、一个提标”工作方案》,要求城市污水处理厂出水标准达到地表水准Ⅳ类,其中TN控制在10 mg/L。工程未实施工程性改造,即实现了新的排放标准。

基于AO消毒工艺的医院污水处理技术分析

AO消毒工艺作为处理医院污水的常用工艺,可以通过在各工艺单元增设相关辅助系统有效提高处理效果。本文通过试验结合工艺应用数据,明确了在调节池、缺氧和好氧池以及消毒池增设搅拌器等设备对污水指标的去除效果。结果表明,不同工艺单元的优化措施仅对提高某些指标的去除率有效。实际运行数据表明,增加辅助搅拌和曝气系统能保证出水达标。人工是运行的最大支出,因此未来应用这项工艺可考虑减少人员配置。

MABR-AO耦合工艺处理乡镇低C/N比生活污水效果研究

本研究针对村镇生活污水低碳氮比导致碳源不足、硝化-反硝化工艺动能不足、脱氮难度高导致脱氮效果不理想的问题,通过设计搭建膜曝气生物反应器(MABR)与传统AO工艺的耦合工艺系统,对村镇进水条件下的挂膜启动,处理低碳氮比(COD/TN为4、3、2、1、0.5)污水,并对两种活性污泥的生物多样性检测分析。结果表明,MABR挂膜周期约30天,系统达到较为稳定的污染物去除效果;在低碳氮比进水条件下,MABR-AO耦合工艺比AO工艺有更好的脱氮能力,总氮(TN)平均去除率相比AO工艺提高17.9%;MABR生物膜中OUTs更高,且脱氮类微生物占比高于AO工艺活性污泥,是脱氮能力更强的主要原因。该工艺运维简单,低碳氮比条件下总氮去除能力较强。