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Smart and fast reinforcement design for anti-dip bedding rock slopes

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第11期15卷 2943-2953页

作者： yun zheng Congxin Chen Fei Meng Xiaodong Fu Wei Yuan State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China University of Chinese Academy of Sciences Beijing100049China School of Civil Engineering and Architecture Wuhan University of TechnologyWuhan430070China Key Laboratory of Roads and Railway Engineering Safety Control of Ministry of Education Shijiazhuang Tiedao UniversityShijiazhuang050043China

Rock slopes are usually reinforced by a number of rock bolts due to the high efficiency and low ***,where should the rock bolts be installed is still a troublesome *** anti-dip bedding rock slopes(ABRSs),the installation position of rock bolts is a controlling factor that determines the reinforcement *** this work,a theoretical method is firstly proposed for assessing the stability of ABRSs reinforced by rock bolts using a limit equilibrium model.A comparison of theoretical calculations and numerical results was conducted to test the correctness of the theoretical *** on the stability assessment of ABRSs,we introduce adaptive moment estimation method(Adam)to optimize the installation location of rock *** Adam optimizer,the optimal layout of rock bolts with the maximum factor of safety can be determined,and the factor of safety of the slope increases by about 25%using the same amount of rock bolts but with different installation *** proposed method enables the fast stability analysis and supporting design for reinforced ABRSs,which paves the way to smart supporting design of slopes.

关键词： Rock slopes Toppling failure Rock bolts Stability assessment Smart analysis

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三种微生物离体氨基酸脱羧酶催化活性的研究

中国调味品 2024年第10期49卷 65-69,100页

作者：李书婷林泽尹礼国张文学吴正云宜宾学院固态发酵资源利用四川省重点实验室四川宜宾644005 四川大学轻工科学与工程学院成都610065

氨基酸脱羧酶(AAD)是生物胺合成的关键酶。微生物AAD一般为胞内酶,但性质稳定,在脱离细胞体系中仍可保持催化活性。文章以具有产生物胺能力的3种微生物细胞超声破碎后的粗酶液为对象,探究了前体氨基酸浓度、pH和盐浓度对离体AAD催化活... 详细信息

氨基酸脱羧酶(AAD)是生物胺合成的关键酶。微生物AAD一般为胞内酶,但性质稳定,在脱离细胞体系中仍可保持催化活性。文章以具有产生物胺能力的3种微生物细胞超声破碎后的粗酶液为对象,探究了前体氨基酸浓度、pH和盐浓度对离体AAD催化活性的影响。结果显示,多数情况下前体氨基酸未充分转化为生物胺,但低浓度前体氨基酸显著降低了离体AAD的催化活性;Lactobacillusplantarum 1-8和Escherichia coli BA-1的AAD在pH为6时催化活性最强,Debaryomyces hansenii MB-1Y的AAD在pH为5时催化活性最强;盐浓度提升导致AAD的催化活性降低。该研究可为探讨食品发酵中AAD的催化特性及其控制提供参考。

关键词：生物胺氨基酸脱羧酶离体酶催化活性环境因素

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5种复配杀菌剂防治海棠锈病的田间药效试验

北方果树 2024年第2期 21-23页

作者：郑运祥刘洋郭文霞河南省安阳市园林绿化科研所河南安阳455000

为进一步筛选有效防治海棠锈病的药剂,选用5种复配杀菌剂进行田间药效试验。结果表明,5种杀菌剂对海棠锈病均有较好的防治效果,且在对应浓度下未发现对叶片产生不良影响,其中30%苯甲·丙环唑SC和45%戊唑·咪鲜胺EW防治效果最好,均达到90... 详细信息

为进一步筛选有效防治海棠锈病的药剂,选用5种复配杀菌剂进行田间药效试验。结果表明,5种杀菌剂对海棠锈病均有较好的防治效果,且在对应浓度下未发现对叶片产生不良影响,其中30%苯甲·丙环唑SC和45%戊唑·咪鲜胺EW防治效果最好,均达到90%以上,可有效控制海棠锈病的危害。

关键词：海棠锈病复配杀菌剂药效试验

Aeroelastic vibration analysis of a 1.5 stage compressor

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Propulsion and Power Research 2020年第1期9卷 26-36页

作者： yun zheng Qingzhe Gao Hui Yang Kang Xu School of Energy and Power Engineering Beihang UniversityBeijing100191China Collaborative Innovation Center for Advanced Aero-Engine Beijing100191China

Aeroelastic vibration problems are commonly found in modern compressors operating in off-design *** amplitude vibration could lead to high cycle fatigue(HCF)of blade and usually occurs in front stages of axial *** this study,the influence of tip gap size on aeroelastic stability is analyzed in a 1.5 stage compressor with an in-house fluid-structure interaction code.A three-dimensional unstructured finite-volume compressible flow solver is applied in the fluid domain and a structure dynamic solver with the modal superimposition method for blade motion is used in the structure *** tip clearances of 1%,2%and 3%of tip axial chord at maximum rotor loading conditions at off-design speeds are analyzed for aeroelastic *** tip leakage flow and vortex structure can be seen near the blade tip region at a larger tip gap *** aeroelastic stability of rotor blade at different tip gap sizes is mainly influenced by the 1st torsion mode,and the variation of aerodynamic damping is not *** intensity of the tip vortex and shock wave are the key factors affecting the aeroelastic stability of rotor when tip gap size increases.

关键词： Aeroelastic vibration problems Axial compressors Tip gap size Aeroelastic stability Tip vortex Shock wave

Giant exophytic cystic adenomyosis with a levonorgestrel containing intrauterine device out of the uterine cavity after uterine myomectomy: A case report

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World Journal of Clinical Cases 2020年第1期8卷 188-193页

作者： Yong Zhou zheng-yun Chen Xin-Mei Zhang Department of Gynecology Women’s HospitalZhejiang University School of Medicine

BACKGROUND A cystic lesion arising from the myometrium of the uterus, termed as cystic adenomyosis, has chocolate-like, thick viscous contents and contains various amounts of endometrial stroma below the glandular epithelium. It is an extremely rare type of *** SUMMARY Herein, we report an unusual case of a giant cystic mass in the pelvic cavity after uterine myomectomy. The patient complained of abnormal uterine bleeding and severe dysmenorrhea. After a levonorgestrel-containing intrauterine device(LNG-IUD) was inserted, her symptoms were greatly alleviated. However, the LNG-IUD was detected in the cystic cavity during the follow-up. For fear of the intrauterine device migrating into and damaging the surrounding viscera,surgical treatment was proposed. Therefore, laparoscopic resection of the lesion and removal of the LNG-IUD were performed and cystic adenomyosis with an LNG-IUD out of the uterine cavity was *** We believe that myomectomy breaking through the endometrial cavity may have been a predisposing factor for the development of cystic adenomyosis in this case.

关键词： Cystic adenomyosis Dysmenorrhea Levonorgestrel containing intrauterine device Myomectomy Case report

双重预防机制建设背景下的安全风险告知研究与实践

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安全 2024年第6期45卷 52-57页

作者：郑昀桑峣李静余新方鑫北京市化工职业病防治院北京100093 中国航天电子技术研究院北京100094 北京市科学技术研究院城市安全与环境科学研究所北京100054

为有效解决企业开展双重预防机制建设过程中存在的安全风险告知内容不规范、不统一、警示标识张贴无序等问题,采用对标分析及标准量化的方法,将风险四色图与现场安全风险告知要素进行集成,提出安全风险告知集成图模式;以某企业为例,开... 详细信息

为有效解决企业开展双重预防机制建设过程中存在的安全风险告知内容不规范、不统一、警示标识张贴无序等问题,采用对标分析及标准量化的方法,将风险四色图与现场安全风险告知要素进行集成,提出安全风险告知集成图模式;以某企业为例,开展安全风险告知实践。结果表明:该模式规范了现场安全风险告知管理,极大提升了企业现场安全风险告知的合规性。

关键词：双重预防机制风险四色图安全风险告知集成图

γ-谷氨酰转移酶和尿酸对子痫前期的临床诊断价值分析

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中国妇幼保健 2024年第7期39卷 1165-1170页

作者：张苗郑运伟马增力曾辛江西省妇幼保健院检验科江西南昌330006 南昌大学公共卫生学院江西南昌330006

目的探讨血清γ-谷氨酰转移酶(GGT)和尿酸(UA)对子痫前期的临床诊断价值。方法选取2020年1月—2022年1月在江西省妇幼保健院产科诊断为子痫前期的患者550例为子痫前期组,另选取同期健康体检的正常孕妇547例为对照组。比较两组孕妇血清GG... 详细信息

目的探讨血清γ-谷氨酰转移酶(GGT)和尿酸(UA)对子痫前期的临床诊断价值。方法选取2020年1月—2022年1月在江西省妇幼保健院产科诊断为子痫前期的患者550例为子痫前期组,另选取同期健康体检的正常孕妇547例为对照组。比较两组孕妇血清GGT和UA表达水平。分析二者辅助诊断子痫前期的临床价值。结果子痫前期组和对照组孕妇血清GGT水平分别为16.00(1.00,31.00)U/L,10.00(3.00,17.00)U/L,血清UA水平分别为449.50(272.00,627.00)μmol/L,329.00(221.00,437.00)μmol/L;子痫前期组孕妇的血清GGT、UA水平均显著高于对照组,差异均有统计学意义(Z=-11.187,-16.189,均P<0.05)。单独检测血清GGT、UA及两指标联合辅助诊断子痫前期的受试者工作特征(ROC)曲线下面积分别为0.701、0.782、0.831。结论血清GGT、UA水平对子痫前期的辅助诊断有良好的临床价值,联合检测的价值更高。

关键词：子痫前期 γ-谷氨酰转移酶尿酸诊断价值

Multi-time Collaborative Restoration for Integrated Electrical-gas Distribution Systems Based on Rolling Optimization

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CSEE Journal of Power and Energy Systems 2024年第2期10卷 660-671页

作者： Jingyang yun zheng Yan yun Zhou Peichao Zhang Weidong Hu Key Laboratory of Control of Power Transmission and Conversion of Ministry of Education Department of Electrical EngineeringShanghai Jiao Tong University

This paper proposes a multi-time collaborative restoration model for integrated electricity-gas distribution sys-tems(IEGDSs)considering multiple resources after extreme weather *** on the linearized power flow constraints of the unbalanced electrical distribution system(EDS)and gas distribution system(GDS),this problem can be formulated as a mixed-integer linear programming(MILP)*** improve the efficiency and veracity of the solution,a rolling optimiza-tion based two-stage method is developed with the first stage solved by a linear approximation model,and the second stage solved by real-time updated rolling *** solving the MILP problem using rolling optimization,the proposed model and solution method achieve efficient and reliable collaborative restoration of IEGDS considering multiple resources and unbal-anced operation characteristics of *** effectiveness of the proposed model and method is validated by using an IEGDS made of a 37-bus unbalanced EDS and 11-node *** Terms-Electricity-gas system,mix-integer linear programming,power system restoration.

关键词： Electricity-gas system mix-integer linear programming power system restoration

Au/γ-Al_(2)O_(3)催化剂的绿色制备及其催化降解亚甲基蓝性能

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化学研究与应用 2024年第3期36卷 634-639页

作者：肖伽励金党琴周慧周龙生王升文郑炳云扬州工业职业技术学院江苏扬州225127 莆田学院福建莆田351100

利用侧柏叶提取液为还原剂制备了纳米金负载型Au/γ-Al_(2)O_(3)催化剂,研究了负载条件对金颗粒物理状态及催化剂比表面积的影响。利用XRD、BET、SEM、TEM对催化剂的晶型、孔结构和形貌进行表征,以亚甲基蓝作为目标污染物探究了Au/γ-Al... 详细信息

利用侧柏叶提取液为还原剂制备了纳米金负载型Au/γ-Al_(2)O_(3)催化剂,研究了负载条件对金颗粒物理状态及催化剂比表面积的影响。利用XRD、BET、SEM、TEM对催化剂的晶型、孔结构和形貌进行表征,以亚甲基蓝作为目标污染物探究了Au/γ-Al_(2)O_(3)的催化降解能力。结果显示,最佳金负载率为1.00%,最佳煅烧温度为300℃。当Au/γ-Al_(2)O_(3)投加量为0.7 g·L^(-1)时,15 mL 0.5 g·L^(-1) NaBH_(4)能在10 min内降解97.67%的亚甲基蓝,且循环利用5次后单位质量催化剂的亚甲基蓝降解率不下降,说明Au/γ-Al_(2)O_(3)催化剂有良好的催化活性和稳定性。

关键词：绿色制备 Au/γ-Al_(2)O_(3) 催化降解能力