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Effects of zero-valent iron added in the flooding or drainage process on cadmium immobilization in an acid paddy soil

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Journal of Environmental Sciences 2024年第4期138卷 19-31页

作者： Hanbing Meng Shiwen Hu Zebin Hong Wenting Chi Guojun Chen Kuan Cheng QiWang Tongxu liu Fangbai Li kexue liu Yang Yang Guangzhou Institute of Geochemistry Chinese Academy of SciencesGuangzhou 510640China National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and ManagementInstitute of Eco-environmental and Soil SciencesGuangdong Academy of SciencesGuangzhou 510650China School of Resources and Planning Guangzhou Xinhua UniversityGuangzhou 510310China University of Chinese Academy of Sciences Beijing 100049China

Zero-valent iron(ZVI)is a promising material for the remediation of Cd-contaminated paddy ***,the effects of ZVI added during flooding or drainage processes on cadmium(Cd)retention remain ***,Cd-contaminated paddy soil was incubated for 40days of flooding and then for 15 days of drainage,and the underlying mechanisms of Cd immobilization coupled with Fe/S/N redox processes were *** addition of ZVI to the flooding process was more conducive to Cd *** potential available Cd was detected by adding ZVI before flooding,which may be due to the increase in paddy soil pH and newly formed secondary Fe ***,the reductive dissolution of Fe minerals promoted the release of soil colloids,thereby increasing significantly the surface sites and causing Cd ***,the addition of ZVI before flooding played a vital role in Cd retention after soil *** contrast,the addition of ZVI in the drainage phase was not conducive to Cd retention,which might be due to the rapid decrease in soil pH that inhibited Cd adsorption and further immobilization on soil *** findings of this study demonstrated that Cd availability in paddy soil was largely reduced by adding ZVI during the flooding period and provide a novel insight into the mechanisms of ZVI remediation in Cd-contaminated paddy soils.

关键词： Paddy soil Zero-valent iron Cadmium Flooding and drainage Remediation

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刑事诉讼中鉴定人出庭制度的运行现状及其改进--以88份裁判文书为研究样本

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中国应用法学 2021年第5期 149-161页

作者：刘科学中国社会科学院研究生院

2012年《刑事诉讼法》修正以后,鉴定人出庭率低等影响鉴定制度效能发挥的问题有所改善,但在司法实践中又出现新的问题和变化。本文以88份裁判文书为样本,采用定量分析和定性分析相结合的方法,对当前刑事诉讼鉴定人出庭制度的运行现状进... 详细信息

2012年《刑事诉讼法》修正以后,鉴定人出庭率低等影响鉴定制度效能发挥的问题有所改善,但在司法实践中又出现新的问题和变化。本文以88份裁判文书为样本,采用定量分析和定性分析相结合的方法,对当前刑事诉讼鉴定人出庭制度的运行现状进行了梳理和分析,进而从变更鉴定人出庭审核模式和建立鉴定人出庭宣誓制度的角度,提出了完善鉴定规则的设想;从加强对鉴定意见异议的回应与说理的角度,发出了落实裁判文书说理责任的倡导;从降低专家辅助人门槛和建立专家辅助人名册的角度,论证了由专家辅助人出庭推动鉴定人出庭的可行性路径。

关键词：鉴定意见鉴定人出庭专家辅助人裁判文书说理

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对小窑未破坏区的开采设计方案研究

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科学之友 2012年第12期 41-41页

作者：刘科学大同煤矿集团有限责任公司四台矿生产技术科

文章介绍了四台矿利用14#煤层已掘巷道上山掘进中,穿过小窑采空区,回采后方12#煤层未破坏煤层,从而减少了巷道的掘进量,提高了煤炭回收率,延长了矿井服务年限,保障了矿井稳定、高效、持续的发展。

关键词：小窑破坏巷道利用率

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考虑分布式电源规模化接入的区域电网日电量预测

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可再生能源 2022年第10期40卷 1407-1414页

作者：刘科学周辛南陈雪敏刘岩燕鹏飞刘梅国网冀北电力有限公司河北石家庄050000 国网冀北电力有限公司计量中心河北石家庄050000 华北电力大学北京102206 北京清软创新科技股份有限公司北京100085

文章结合分布式电源出力与历史负荷数据,提出了一种基于集成学习框架Adaboost,以最小二乘支持向量机为Adaboost算法基学习器的区域电网日电量预测方法。通过建立LLSVM-Adaboost预测模型对分布式电源规模化接入后的区域电网的日电量进行... 详细信息

文章结合分布式电源出力与历史负荷数据,提出了一种基于集成学习框架Adaboost,以最小二乘支持向量机为Adaboost算法基学习器的区域电网日电量预测方法。通过建立LLSVM-Adaboost预测模型对分布式电源规模化接入后的区域电网的日电量进行有效预测。Adaboost集成策略对LLSVM基学习器进行加权组合,根据每个LLSVM基学习器的预测误差计算权重,并进行基学习器权值分配和重组,大大提升了模型的泛化能力和预测精度。利用文章所提算法,使用冀北电网实际数据,针对分布式电源规模化接入的典型日电量情况验证了该算法的有效性,具有较好的预测效果。

关键词：分布式电源规模化接入最小二乘支持向量机 Adaboost集成学习区域电网日电量预测

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Frequency Regulation of VSC-MTDC System with Offshore Wind Farms

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Journal of Modern Power Systems and Clean Energy 2024年第1期12卷 275-286页

作者： Haoyu liu Chongru liu North China Electric Power University Beijing 102206China

Frequency regulation of voltage source converter-based multi-terminal high-voltage direct current(VSC-MTDC)system with offshore wind farms enhances the frequency stability by compensating the power for a disturbed AC ***,it is difficult to reasonably allocate frequency-regulation resources due to a lack of coordination mechanisms between wind farms and the MTDC ***,it is difficult for the frequency control of the wind farms to manage changes in wind speed;and the risk of wind-turbine stalls is ***,based on the kinetic energy of wind turbines and the power margin of the converters,the frequency-regulation capability of wind turbines is evaluated,and a dynamic frequency-support scheme considering the real-time frequency-support capability of the wind turbines and system frequency evolution is proposed to improve the frequency-support performance.A power adaptation technique at variable wind speeds is developed;the active power in the frequency-support stage and restoration stage is switched according to the wind speed.A hierarchical zoning frequency-regulation scheme is designed to use the frequency-regulation resources of different links in the MTDC system with wind *** simulation results show that the novel frequency-regulation strategy maintains frequency stability with wind-speed changes and avoids multiple frequency dips.

关键词： Wind generation voltage source converter-based multi-terminal high-voltage direct current(VSC-MTDC) frequency regulation cooperative control adaptive control variable wind speed

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光纤-无线传感器网关在智能电网中的应用

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重庆理工大学学报（自然科学） 2019年第1期33卷 118-124页

作者：谢宏伟鲍常军刘科学赵娟国网内蒙古东部电力有限公司呼和浩特010010 天津科技大学现代分析技术研究中心天津300457

为了解决电网基础设施通信流量的服务质量供给问题,提出一种光纤-无线传感器网络(Fi-WSN)电网网关设计。首先,该设计基于数据包的优先等级对到达基站的数据包进行分类,并将其排队放入优先级队列。然后,Fi-WSN网关负责协调WSN数据包处理... 详细信息

为了解决电网基础设施通信流量的服务质量供给问题,提出一种光纤-无线传感器网络(Fi-WSN)电网网关设计。首先,该设计基于数据包的优先等级对到达基站的数据包进行分类,并将其排队放入优先级队列。然后,Fi-WSN网关负责协调WSN数据包处理,并将其聚集在一起;最后,为了聚合突发数据,利用突发组装机制将突发数据封装到服务等级队列中。仿真结果证明:在WSN报告消息频率较为频繁的情况下,与EPON-WiMAX相比,所提设计的高优先级数据包的端到端延迟和最大延迟更加接近基准EPON,而且低优先级数据包的端到端延迟和最大延迟明显低于EPON-WiMAX。所提设计提高了紧急消息的服务质量,性能更优。

关键词：以太无源光网络智能电网无线传感器网络突发组装机制聚合

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A Novel Design of a Pre-separation Panel Structure to Protect Against the Impact of an Explosion in an Aircraft Plenum Chamber

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Acta Mechanica Solida Sinica 2024年第1期37卷 166-180页

作者： Zongxing liu Xiang Yang Jun liu School of Aeronautics Northwestern Polytechnical UniversityXi'an 710072China COMAC Shanghai Aircraft Design and Research Institute Shanghai 201210China

To reduce the damage of the pressurizing panel structure of a fuselage caused by an explosion at the“least risk bomb location”in an aircraft structure,a new pre-separation panel structure was designed to resist blast ***,the dynamic strain response and morphology of impact damage of the new pre-separation panel were measured in an impact damage ***,the commercial software LS-DYNA was used to calculate the propagation of the blast shock wave,and the results were compared with empirical equations to verify the rationality of the numerical calculation ***,the fluid–structure coupling method was used to calculate the damage process of the pre-separation panel structure under the impact of an explosion wave and an impact *** calculated results were in good agreement with the test results,which showed the rationality of the calculation method and the *** residual strength of the damaged pre-separation panel was significantly higher than that of the original damaged *** results show that the new pre-separation panel structure is reasonable and has certain significance for guiding the design of plenum chambers with strong resistance to implosion for aircraft fuselages.

关键词： Pre-separation panel structure Explosive response Residual strength Aircraft plenum chamber Least risk bomb location

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Stochastic Unit Commitment with High-Penetration Offshore Wind Power Generation in Typhoon Scenarios

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Journal of Modern Power Systems and Clean Energy 2024年第2期12卷 535-546页

作者： Yanqi liu Dundun liu Hongcai Zhang State Key Laboratory of Internet of Things for Smart City and Department of Electrical and Computer Engineering University of MacaoMacao 999078China University of Macao Zhuhai UM Science and Technology Research Institute ZhuhaiChina

To tackle the energy crisis and climate change,wind farms are being heavily invested in across the *** China's coastal areas,there are abundant wind resources and numerous offshore wind farms are being *** secure operation of these wind farms may suffer from typhoons,and researchers have studied power system operation and resilience enhancement in typhoon ***,the intricate movement of a typhoon makes it challenging to evaluate its spatial-temporal *** published papers only consider predefined typhoon trajectories neglecting *** address this challenge,this study proposes a stochastic unit commitment model that incorporates high-penetration offshore wind power generation in typhoon *** adopts a data-driven method to describe the uncertainties of typhoon trajectories and considers the realistic anti-typhoon mode in offshore wind farms.A two-stage stochastic unit commitment model is designed to enhance power system resilience in typhoon *** formulate the model into a mixed-integer linear programming problem and then solve it based on the computationally-efficient progressive hedging algorithm(PHA).Finally,numerical experiments validate the effectiveness of the proposed method.

关键词： Unit commitment two-stage stochastic programming offshore wind farm typhoon

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Effectiveness and safety of acupuncture in treatment of pregnancyrelated symptoms:a systematic review and Meta-analysis

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Journal of Traditional Chinese Medicine 2024年第1期44卷 16-26页

作者： liu Tingting liu Tongou liu Mingfu School of Traditional Chinese Medicine Clinical Medicine Hubei University of Traditional Chinese MedicineWuhan 430000China First Clinical College of Hubei University of Traditional Chinese Medicine Wuhan 430000China Department of Acupuncture and Tuina Affiliated Hospital of Hubei University of Traditional Chinese MedicineHubei Provincial Hospital of Traditional Chinese MedicineWuhan 430000China

OBJECTIVE:To systematically evaluate the efficacy and safety of acupuncture(AM)in the treatment of pregnancyrelated symptoms such as acute vomiting during ***:We comprehensively searched the available literature up to November 2021,including Pub Med,Embase,Cochrane Library,Chinese Biomedical Literature Database,and China National Knowledge Infrastructure Database,for randomized controlled trials(RCTs)on AM for the treatment of severe vomiting,insomnia,pharyngeal and pelvic pain,mood abnormalities,and dyspepsia during ***:Sixteen RCTs with a cumulative sample size of 1178 cases were *** these,964 patients were included in the *** Meta-analysis results showed that AM was more efficient than Western medicine in treating discomfort during pregnancy[odds ratio(OR)=1.19,95%confidence interval(CI)(1.11,1.28),P<0.01].AM was better than the control group in improving the visual analog scale scores[standard mean difference(SMD)=0.62,95%CI(0.53,0.71),P<0.01].AM was superior to the control group in improving Numerical Rating Scale(NRS)symptom scores[OR=7.31,95%CI(3.36,15.94),P<0.01].There was no significant difference in adverse effects between the AM and sham-AM groups and the analgesic drug group[OR=0.70,95%CI(0.39,1.28),P=0.25],but the treatment and control groups had mild adverse effects with a low ***:AM is more effective than other treatments or pharmacotherapy alone in the treatment of pregnancy-related symptoms,and is relatively ***,the quality of the included trials was rather poor,and high-quality studies are required to confirm our findings.

关键词： acupuncture pregnancy nausea vomiting sleep initiation and maintenance disorders low back pain pelvic pain mood abnormalities Meta-analysis systematic review

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Devolatilization of high viscous fluids with high gravity technology

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Chinese Journal of Chemical Engineering 2024年第7期71卷 249-257页

作者： Jibing Qi Youzhi liu Yandong liu Taiyuan University Taiyuan 030032China Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering North University of ChinaTaiyuan 030051China

Volatile organic compounds(VOCs)are generally toxic and harmful substances that can cause health and environmental *** removal of VOCs from polymers has become a key *** effective devolatilization to remove VOCs from high viscous fluids such as polymer is necessary and is of great *** this study,the devolatilization effect of a rotating packed bed(RPB)was studied by using polydimethylsiloxane as the viscous fluid and acetone as the *** devolatilization rate and liquid phase volume(KLa)have been *** results indicated that the optimum conditions were the high-gravity factor of 60,liquid flow rate of 10 L·h^(-1),and vacuum degree of 0.077 *** dimensionless correlation of KLa was established,and the deviations between predicted and experimental values were less than±28%.The high-gravity technology will result in lower mass transfer resistance in the devolatilization process,enhance the mass transfer process of acetone,and improve the removal effect of *** work provides a promising path for the removal of volatiles from polymers in combination with high-gravity *** can provide the basis for the application of RPB in viscous fluids.

关键词： High-gravity technology Devolatilization rate High viscous fluid Volatile organic compounds(VOCs)

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