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淮阴抽水站进出水流道性能CFD分析

海河水利 2024年第5期 66-70页

作者：郭赞赞任轶昌魏胡雪枫江苏省灌溉总渠管理处江苏淮安223200 江苏省水利科教中心江苏南京210000

为充分了解淮阴抽水站进出水内部流态,满足抽水站加固改造设计要求,采用计算流体动力学方法(CFD),对淮阴抽水站进出水流道内部流场进行数值优化水力计算分析。结果表明,淮阴抽水站现有流道可获得较为理想的水力性能,虽然水力性能略低于... 详细信息

为充分了解淮阴抽水站进出水内部流态,满足抽水站加固改造设计要求,采用计算流体动力学方法(CFD),对淮阴抽水站进出水流道内部流场进行数值优化水力计算分析。结果表明,淮阴抽水站现有流道可获得较为理想的水力性能,虽然水力性能略低于同等泵站,但差异不大,本次加固改造可不进行进出水流道改造。

关键词：淮阴抽水站 CFD 流道流道损失

“互联网+”背景下长沙市智慧养老发展路径研究——以岳麓区为例

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江苏商论 2024年第8期 65-68,92页

作者：喻琨陈国生胡雪晴长沙卫生职业学院湖南长沙410000 湖南工学院湖南数字经济研究所湖南衡阳421002 湖南交通工程学院财务处湖南衡阳421001

“互联网+”智慧养老服务以先进信息技术为支撑,利用智能养老产品和创新模式,有效连接养老需求和养老资源的供给,已成为新时代中国养老服务业发展的新方向。通过对长沙市岳麓区智慧养老服务现状、运行模式及其成效的阐述,本文分析所面... 详细信息

“互联网+”智慧养老服务以先进信息技术为支撑,利用智能养老产品和创新模式,有效连接养老需求和养老资源的供给,已成为新时代中国养老服务业发展的新方向。通过对长沙市岳麓区智慧养老服务现状、运行模式及其成效的阐述,本文分析所面临的问题与挑战,提出以老年人需求为导向,丰富养老服务内容;加强机构组织协调,促进养老服务资源整合等对策建议。

关键词：智慧养老创新模式资源整合优化

2012—2023年某医院耐碳青霉烯类肺炎克雷伯菌感染流行特征分析

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中国消毒学杂志 2024年第6期41卷 436-439,443页

作者：王蔚莎叶龙张妮胡雪姣南方医科大学附属广东省人民医院广东省医学科学院广东广州510080

目的调查分析某医院临床送检标本耐碳青霉烯类肺炎克雷伯菌(CRKP)的检出情况及其相关临床特征,为合理用药和防控CRKP医院感染提供依据。方法采用回顾性调查方法,收集2012—2023年该医院各临床科室患者临床标本分离的肺炎克雷伯菌资料;... 详细信息

目的调查分析某医院临床送检标本耐碳青霉烯类肺炎克雷伯菌(CRKP)的检出情况及其相关临床特征,为合理用药和防控CRKP医院感染提供依据。方法采用回顾性调查方法,收集2012—2023年该医院各临床科室患者临床标本分离的肺炎克雷伯菌资料;比较不同来源、不同科室和不同类型患者CRKP检出情况,并分析病原菌耐药性变化。结果非血流感染组CRKP检出率高于血流感染组(11.2%vs 7.9%;χ^(2)=11.534,P=0.001);血液、痰、支气管肺泡灌洗液、尿液和脑脊液的CRKP检出率随年份变化呈总体上升趋势(P95%。结论医院应加强对重要类型标本、重点病区和特殊人群的有效监测,规范抗菌药物的合理使用。

关键词：肺炎克雷伯菌耐碳青霉烯类检出率耐药率

经皮弯角椎体成形术治疗骨质疏松性椎体压缩骨折的疗效分析

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临床和实验医学杂志 2024年第14期23卷 1522-1526页

作者：谢学虎刘宁孟海张国强杨雍首都医科大学附属北京友谊医院骨科中心北京100050

目的探讨经皮弯角椎体成形术治疗骨质疏松性椎体压缩骨折(OVCF)的疗效。方法回顾性分析自2021年1月至12月在首都医科大学附属北京友谊医院住院治疗的100例OVCF患者。按手术方法不同分为两组:双侧穿刺经皮椎体成形术(PVP)组和单侧穿刺弯... 详细信息

目的探讨经皮弯角椎体成形术治疗骨质疏松性椎体压缩骨折(OVCF)的疗效。方法回顾性分析自2021年1月至12月在首都医科大学附属北京友谊医院住院治疗的100例OVCF患者。按手术方法不同分为两组:双侧穿刺经皮椎体成形术(PVP)组和单侧穿刺弯曲椎体成形术(PCVP)组,各50例。记录并比较两组患者的手术时间、透视次数、骨水泥体积、骨水泥渗漏率、骨水泥弥散优良率,术前、术后1周、术后6周的疼痛[视觉模拟评分法(VAS)]评分。结果PVCP组手术时间为(22.68±2.72)min,短于对照组[(31.44±4.01)min],透视次数、骨水泥注入量、骨水泥渗漏率方面分别为(13.94±3.19)次、(4.56±0.60)mL、16.00%,均显著低于PVP组[(21.02±3.34)次、(6.88±0.87)mL、34.00%],差异均有统计学意义(P0.05)。术前、术后1周、术后6周,两组患者VAS评分比较,差异均无统计学意义(P>0.05);术后1、6周,两组患者VAS评分均较术前明显下降,差异均有统计学意义(P<0.05)。结论PCVP治疗OVCF治疗效果与双侧穿刺PVP相当,且手术时间更短、骨水泥注入量更少、骨水泥渗漏发生风险更低。

关键词：骨质疏松性椎体压缩骨折经皮弯角椎体成形术骨水泥

Flavonoid-producing tomato plants have a direct negative effect on the zoophytophagous biological control agent Oriussauteri

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Insect Science 2023年第1期30卷 173-184页

作者： Fengbo Yang Xinyi Zhang Haowei Shen hu xue Tian Tian Qinghe Zhang Jinyu hu Hong Tong Youjun Zhang Qi Su hubei Engineering Technology Center for Forewarning and Management of Agricultural and Forestry Pests College of AgricultureYangtze UniversityJingzhouHubei ProvinceChina Institute of Vegetables and Flowers Chinese Academy of Agricultural SciencesBejingChina

Orius sauteri(Poppius)(Hemiptera:Anthocoridae)is often used for biological control of small arthropod pests in greenhouse vegetable production systems in *** addition to feeding on arthropod prey,*** consumes small quantities of plant *** studies demonstrated that tomato plant chemistry confers antixenosis resistance to phloem-feeding whiteflies,but the potential nontarget effects of phytochemicals on the beneficial predator *** are *** of *** confined to near-isogenic lines(NILs)of tomatoes producing high levels offlavonoids(NIL-purple hypocotyl;resistant to whiteflies)and low levels of flavonoids(NIL-green hypocotyl;susceptible to whiteflies)revealed that *** had reduced oviposition,nymphal survival,and development on resistant plants,even if they were also provided with prey that did not feed on the host ***,*** showed a significant ovipositional preference in choice assays,laying significantly more eggs on susceptible than on resistant *** gut content analysis using the specific chloroplast trnL gene from tomato confirmed that adult and immature *** feed on both resistant and susceptible genotypes,and feeding behavior assays revealed that resistance did not affect plant feeding or prey acceptance by *** *** results demonstrate a direct negative effect of phytochemicals on a nontarget beneficial species and indicate that resistance mediated by phytochemicals can affect organisms that do not solely feed on phloem *** results also indicate that the mode of action and the potential ecological effects of phytochemicalmediated resistance are broader than previously recognized.

关键词： biological control host plant resistance insect resistance integrated pest management natural enemy phytochemistry

基于BP神经网络PID的节水灌溉施肥系统研究

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农机化研究 2024年第11期46卷 53-58页

作者：朱凤磊张立新胡雪李文春王晓瑛孟子皓吴勋石河子大学机械电气工程学院新疆石河子832000 图木舒克银丰现代农业装备有限公司新疆图木舒克843900

中国的化肥使用率常年居世界首位,且农业用水利用率较低,依靠个人经验的方法不仅造成了肥料和水资源的浪费,而且使当地生态环境也受到污染。由于管路运输等原因,节水灌溉施肥系统具有模型的时变性、非线性与时滞性的特点,普通控制器很... 详细信息

中国的化肥使用率常年居世界首位,且农业用水利用率较低,依靠个人经验的方法不仅造成了肥料和水资源的浪费,而且使当地生态环境也受到污染。由于管路运输等原因,节水灌溉施肥系统具有模型的时变性、非线性与时滞性的特点,普通控制器很难对节水灌溉施肥系统的流量进行精准控制。针对上述问题,设计了一种基于BP神经网络PID的控制器,以期实现节水灌溉施肥系统对液体肥流量的精准控制;同时,与传统PID控制器进行对比,用MatLab软件进行仿真分析,得到阶跃响应曲线。研究结果表明:基于BP神经网络PID的控制器具有优异的控制效果,可以满足节水灌溉施肥系统精准控制的实际要求。

关键词：灌溉施肥神经网络 BP-PID 精准控制

Variability of the Pacific subtropical cells under global warming in CMIP6 models

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Journal of Oceanology and Limnology 2024年第1期42卷 24-40页

作者： xue HAN Junqiao FENG Yunlong LU Dunxin hu Key Laboratory of Ocean Circulation and Waves Chinese Academy of SciencesQingdao 266071China Institute of Oceanology Chinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China Laboratory for Ocean Dynamics and Climate Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China

The Pacific subtropical cells(STCs)are shallow meridional overturning circulations connecting the tropics and subtropics,and are assumed to be an important driver of the tropical Pacific decadal *** variability of STCs under global warming is investigated using multimodal outputs from the latest phase of the Coupled Model Inter-comparison Project(CMIP6)and ocean reanalysis ***,the volume transport diagnostic analysis is employed to evaluate how coupled models and ocean reanalysis products reproduce interior STC *** variation of heat transport by the interior STC under the high-emissions warming scenarios is also *** results show that the multimodal-mean linear trends of the interior STC transport along 9°S and 9°N are-0.02 Sv/a and 0.04 Sv/a under global warming,respectively,which is mainly due to the combined effect of the strengthened upper oceanic stratification and the weakening of wind *** is a compensation relationship between the interior STC and the western boundary transport in the future climate,and the compensation relationship of 9°S is more significant than that of 9°*** addition,compared with ocean reanalysis products,the coupled models tend to underestimate the variability of the interior STC transport convergence,and thus may lose some sea surface temperature(SST)driving force,which may be the reason for the low STC-SST correlation simulated by the *** future scenario simulation shows that the heat transport of interior STC is weakened under global warming,with a general agreement across models.

关键词： interior subtropical cell(STC) global warming Coupled Model Inter-comparison Project(CMIP6) western boundary transport

Enhancing strength of an ultra-low-carbon weathering steel to 700 MPa by adjusting Ti content

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Journal of Iron and Steel Research(International) 2023年第12期30卷 2494-2504页

作者： Tian-en Peng Zhi-wei Lian Yuan-yang Zhang Bo He xue-wen hu Tao Zhu Bo Jiang School of Materials Science and Engineering University of Science and Technology BeijingBeijing100083China Technical Center Ma’anshan Iron&Steel Co.Ltd.Ma’anshan243041AnhuiChina

The microstructure and mechanical properties of a traditional Ti-microalloyed weathering steel were analyzed,and the strength was improved by proposing an optimized Ti *** yield strength and elongation of the steel were 640 MPa and 25.5%,*** microstructure was ferrite and pearlite,and the average grain size was 5.4μ*** precipitates were mainly TiC with the size below 20 nm,and the average diameter was 18.2 *** yield strength of the newly proposed weathering steel with Ti content of 0.018%higher than that of the traditional steel reached up to 709 MPa,and the elongation was 23.5%.The ferrite grain was refined to 3.8μm,the fraction of TiC under 10 nm was obviously increased,and the average diameter of particles was 9.8 *** increase in Ti also promoted the recrystallization process,thus leading to the reduction in dislocation *** yield strength of the newly proposed weathering steel was increased to higher than 700 MPa by adjusting the Ti content mainly resulting from three aspects:grain refinement,precipitation and dislocation *** contributed values were 45,64 and–40 MPa,respectively.

关键词： Ti microalloying Weathering steel Microstructure Strength Plasticity

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采棉机摘锭磨损分析和表面强化技术研究现状

新疆农机化 2024年第4期 37-39,54页

作者：何立艺胡雪夏博刘新州范青青石河子大学机械电气工程学院新疆石河子832000 阿拉尔润农现代农业科技有限公司新疆阿拉尔843300

摘锭作为采棉机的关键零部件,在棉花收获领域变得越来越重要。本文阐述了国内外关于采棉机摘锭磨损分析和表面强化技术的研究进展。总结采棉机摘锭了失效类型及原因,进一步论述了表面强化技术在采棉机摘锭上的研究现状,讨论了目前采棉... 详细信息

摘锭作为采棉机的关键零部件,在棉花收获领域变得越来越重要。本文阐述了国内外关于采棉机摘锭磨损分析和表面强化技术的研究进展。总结采棉机摘锭了失效类型及原因,进一步论述了表面强化技术在采棉机摘锭上的研究现状,讨论了目前采棉机摘锭磨损状态研究及表面强化应用所面临的挑战,并展望了未来的研究趋势。

关键词：摘锭磨损表面强化