检索结果-南通市图书馆

The effect of substrate grain size on burrowing ability and distribution characteristics of Perinereis aibuhitensis

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2019年第12期38卷 52-58页

作者： Tao Sun Chun’e Liu Xingzuo Li Dongzhengyang An Hairui Yu Zheng ma Feng Liu Yantai Research Institute China Agricultural UniversityYantai 264670China School of Public Health Harvard UniversityCambridge 02138USA College of Biological and Agricultural Engineering Weifang UniversityWeifang 261061China Shandong Dongrun Instrument Sci-Tech Co. Ltd.Yantai 264003China

Perinereis aibuhitensis(Grube, 1878) lives in marine sediments of estuary or shoal areas, where substrate has some crucial environmental factors affecting its burrowing and distribution. In order to provide basic data for the habitat selection and suitability evaluations of the artificial aquaculture of P. aibuhitensis, this paper conducted a quantified analysis of its burrowing ability and explored its behavioral preferences in different substrates,including mud(mainly composed of mud and fine sand are fit for aquaculture and stock enhancement. Based on behavioral preferences and ecological rehabilitation function of P. aibuhitensis, this paper proposes a symbiotic system of marine animals and halophytes, and constructs an ecosystem model of"marine fish-Halophytes-Perinereis aibuhitensis" with P. aibuhitensis as the link.

关键词： Perinereis aibuhitensis substrate grain size burrowing ability distribution characteristics

A functional characterization of TaMs1 orthologs in Poaceae plants

在线全文

学校读者我要写书评

暂无评论

The Crop Journal 2021年第6期9卷 1291-1300页

作者： Jian Li Zheng Wang Zhenyi Chang Hang He Xiaoyan Tang Ligeng ma Xing Wang Deng Peking University Institute of Advanced Agricultural Sciences Weifang 261325ShandongChina Shenzhen Institute of Molecular Crop Design Shenzhen 518107GuangdongChina College of Life Sciences Capital Normal UniversityBeijing Key Laboratory of Plant Gene Resources and Biotechnology for Carbon Reduction and Environmental ImprovementBeijing 100048China

TaMs1 encodes a non-specific lipid transfer protein(nsLTP) and is required for pollen development in wheat. Although MS1 is a Poaceae-specific gene, the roles of MS1 genes in other Poaceae plants are unknown, especially in rice and maize. Here, we identified one ortholog in rice(OsLTPg29) and two orthologs in maize(ZmLTPg11 and ZmLTPx2). Similar to TaMs1, both OsLTPg29 and ZmLTPg11 genes are specifically expressed in the microsporocytes, and both OsLTPg29 and ZmLTPg11 proteins showed lipid-binding ability to phosphatidic acid and several phosphoinositides. To determine their roles in pollen development, we created osltpg29 mutants and zmltpg11 zmltpx2 double mutants by CRISPR/***29, not zmltpg11 zmltpx2, is defective in pollen development, and only OsLTPg29, not ZmLTPg11,can rescue the male sterility of tams1 mutant. Our results demonstrate that the biological function of MS1 in pollen development differs in the evolution of Poaceae plants.

关键词： MS1 Poaceae nsLTP Pollen development

原油热蚀变程度评价指标研究——以准噶尔盆地南缘霍尔果斯和呼图壁油气田为例

在线全文

学校读者我要写书评

暂无评论

科技导报 2012年第31期30卷 43-46页

作者：曹宏明巩卫芳张云献马练军中国地质大学北京地球科学与资源学院北京100083 中国石油化工股份有限公司中原油田分公司勘探开发研究院河南濮阳457001

石油的次生变化对石油性质的改造有时会超过有机质来源和热成熟度作用的影响,而热蚀变是地史时期地质体中一种较为常见的次生变化。本文选取准噶尔盆地南缘原油样品系统模拟热蚀变过程,并进行数据分析,从中筛选出相关性良好的菲/甲基菲(... 详细信息

石油的次生变化对石油性质的改造有时会超过有机质来源和热成熟度作用的影响,而热蚀变是地史时期地质体中一种较为常见的次生变化。本文选取准噶尔盆地南缘原油样品系统模拟热蚀变过程,并进行数据分析,从中筛选出相关性良好的菲/甲基菲(P/MP)比值和(3-MP+2-MP)/(9-MP+1-MP)比值两项指标,它们能够很好地反映原油热变程度;根据筛选出的这两项指标,制作了判别原油热蚀变程度的图版。应用该图版分析准噶尔盆地南缘霍尔果斯和呼图壁油气田原油热蚀变程度,结果显示,霍尔果斯霍10井原油可能为原生油藏,热变程度较低,而霍浅1和霍002原油可能是由埋藏较深、热变程度高的原始油藏向上运移产生的次生油气藏;准噶尔南缘的安5井、石南31井及呼图壁气田中的呼2井原油处于正常成熟阶段,表明其所处油气藏基本上为原生油气藏。

关键词：原油次生变化热蚀变热模拟实验次生油气藏

Colonoscopy-induced acute appendicitis: A case report

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2023年第36期11卷 8563-8567页

作者： Xiao-Ling Song Jin-You ma Zhi-Gao Zhang Department of Gastroenterology Sunshine Union HospitalWeifang 261000Shandong ProvinceChina

BACKGROUND Colonoscopy is widely used for examination,diagnosis,and treatment because of its low incidence of associated ***-colonoscopy appendicitis(PCA)is very rare and is easily misdiagnosed as electrocoagulation syndrome or colon ***,clinicians should pay close attention to this *** SUMmaRY A 47-year-old female patient underwent a colonoscopy for a systematic physical examination,and the procedure was uneventful with normal endoscopic and histologic ***,the bowel preparation was suboptimal(Boston 2-3-2).After the examination,the patient experienced pain in the lower abdomen,which progressively *** tomography of the lower abdomen and pelvis revealed appendiceal calcular obstruction and *** the patient refused surgery,she was managed with antibiotics and recovered *** In the current literature,the definition of PCA remains ***,abdominal pain after colonoscopy should be differentiated from acute appen-dicitis.

关键词： Colonoscopy Complications Appendicitis Differential diagnosis Case report

人生意义感对戒毒人员复吸风险的影响:自尊和抑郁感的链式中介作用

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国健康心理学杂志 2019年第3期27卷 439-443页

作者：钟伟芳马洁侯伟广东司法警官职业学院中国广东广州510520

目的:探讨人生意义感对戒毒人员复吸风险的影响,以及自尊、抑郁感在两者关系中的中介作用。方法:采用人生意义感量表(MLQ)、自尊量表(SES)、简版流调中心抑郁量表(CES-D-10)和毒品复吸高危量表对255名强制戒毒人员进行调查。结果:①人... 详细信息

目的:探讨人生意义感对戒毒人员复吸风险的影响,以及自尊、抑郁感在两者关系中的中介作用。方法:采用人生意义感量表(MLQ)、自尊量表(SES)、简版流调中心抑郁量表(CES-D-10)和毒品复吸高危量表对255名强制戒毒人员进行调查。结果:①人生意义感与自尊显著正相关(r=0.240,P<0.001),与抑郁感、复吸风险显著负相关(r=-0.300,-0.208;P<0.001);自尊与抑郁感、复吸风险显著负相关(r=-0.387,-0.281;P<0.001);抑郁感与复吸风险显著正相关(r=0.591,P<0.001);②人生意义感不能显著直接影响复吸风险,但可以通过抑郁感的中介作用,以及自尊和抑郁感的链式中介作用间接地影响复吸风险;③抑郁感的中介效应值为-0.130,占总效应的68.783%;自尊-抑郁感的链式中介效应值为-0.046,占总效应的24.339%。结论:人生意义感通过两条路径影响戒毒人员的复吸风险,一条是通过抑郁感的中介作用负向影响复吸风险,另一条是通过自尊和抑郁感的链式中介作用负向影响复吸风险。

关键词：人生意义复吸自尊抑郁感

基于改进Apriori算法的装配式建筑质量风险关联规则研究

在线全文

学校读者我要写书评

暂无评论

工业工程与管理 2024年第5期29卷 85-93页

作者：汪和平张卫芳安徽工业大学安徽马鞍山243002

为探究装配式建筑质量风险因素间的关联关系,在利用文献分析法分析203篇相关文献构建质量风险指标的基础上,采用递阶层次模型的AHP法计算主观权重,考虑局部惩罚-激励机制的变权理论计算客观权重,基于组合赋权法得到的综合权重对传统Apri... 详细信息

为探究装配式建筑质量风险因素间的关联关系,在利用文献分析法分析203篇相关文献构建质量风险指标的基础上,采用递阶层次模型的AHP法计算主观权重,考虑局部惩罚-激励机制的变权理论计算客观权重,基于组合赋权法得到的综合权重对传统Apriori算法进行改进,提出加权Apriori算法对装配式建筑各工作空间风险进行关联规则挖掘分析。通过分析挖掘结果的不同作业空间、影响因素分布水平、高加权支持度、高置信度等特征,发现关键因素、关键致因关联、风险规律,有助于制定管理措施和提升防控水平。

关键词：质量风险变权理论加权关联规则数据挖掘改进Apriori算法

在线全文

学校读者我要写书评

暂无评论

基于XGBoost算法的预警模型研究

电子设计工程 2022年第19期30卷 49-54,59页

作者：陆万万王维芳马煜敏上海计算机软件技术开发中心上海201112

针对智慧警务建设过程中犯罪预警机制滞后的问题,提出了一种融合警务系统中人员数据的通用预警模型。该模型采用随机森林算法对高维稀疏样本特征进行重要性排序,筛选得到最优特征子集。利用SMOTE过采样算法对训练集样本进行采样处理,以... 详细信息

针对智慧警务建设过程中犯罪预警机制滞后的问题,提出了一种融合警务系统中人员数据的通用预警模型。该模型采用随机森林算法对高维稀疏样本特征进行重要性排序,筛选得到最优特征子集。利用SMOTE过采样算法对训练集样本进行采样处理,以平衡正负样本集。该文预警模型基于XGBoost算法实现风险样本数据的分类提取,并使用粒子群优化算法对XGBoost模型的AUC值为目标函数做参数调优,提高模型预测精度。结果表明,该模型在不均衡数据集下平均准确度可达到90%以上。

关键词：大数据 XGBoost 随机森林(RF) SMOTE过采样算法粒子群算法(PSO)

Neural Network Robust Control Based on Computed Torque for Lower Limb Exoskeleton

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2024年第2期37卷 83-99页

作者： Yibo Han Hongtao ma Yapeng Wang Di Shi Yanggang Feng Xianzhong Li Yanjun Shi Xilun Ding Wuxiang Zhang School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191China Beihang Goer(weifang)Intelligent Robot Co. Ltd.Beihang UniversityWeifangChina Research Center of Satellite Technology Harbin Institute of TechnologyHarbinChina Beijing Xinfeng Aerospace Equipment Co. LtdBeijingChina

The lower limb exoskeletons are used to assist wearers in various scenarios such as medical and industrial *** modeling errors of the exoskeleton in different application scenarios pose challenges to the robustness and stability of its control *** Radial Basis Function(RBF)neural network is used widely to compensate for modeling *** order to solve the problem that the current RBF neural network controllers cannot guarantee the asymptotic stability,a neural network robust control algorithm based on computed torque method is proposed in this paper,focusing on trajectory *** innovatively incorporates the robust adaptive term while introducing the RBF neural network term,improving the compensation ability for modeling *** stability of the algorithm is proved by Lyapunov method,and the effectiveness of the robust adaptive term is verified by the *** wearing the exoskeleton under different walking speeds and scenarios were carried out,and the results show that the absolute value of tracking errors of the hip and knee joints of the exoskeleton are consistently less than 1.5°and 2.5°,*** proposed control algorithm effectively compensates for modeling errors and exhibits high robustness.

关键词： Lower limb exoskeleton Model compensation RBF neural network Computed torque method

在线全文

学校读者我要写书评

暂无评论

1株阿魏酸降解菌的筛选与降解特征研究

土木建筑与环境工程 2014年第6期36卷 106-111页

作者：谢越马忠友孔维芳李孝良汪建飞肖新马万征邹海明安徽科技学院城建与环境学院安徽科技学院生命科学学院安徽凤阳233100 昆山蓝德环保科技有限公司江苏昆山215331

阿魏酸是导致很多作物产生连作障碍的自毒物质。筛选出1株高效降解阿魏酸的细菌,初步鉴定为葡萄球菌属,命名为AWS4B,研究了AWS4B对阿魏酸的降解特征,探讨了其降解途径。结果表明,当无机盐培养基中阿魏酸的浓度为100 mg/L时,菌株AWS4B72... 详细信息

阿魏酸是导致很多作物产生连作障碍的自毒物质。筛选出1株高效降解阿魏酸的细菌,初步鉴定为葡萄球菌属,命名为AWS4B,研究了AWS4B对阿魏酸的降解特征,探讨了其降解途径。结果表明,当无机盐培养基中阿魏酸的浓度为100 mg/L时,菌株AWS4B72h可降解99.97%。降解过程符合一级动力学模型,反应的活化能Ea为19.88kJ/mol,降解方程常数k0为3.26×10-4,得出了菌株AWS4B降解阿魏酸的预测模型方程。AWS4B降解阿魏酸的底物来源比较广泛。菌株AWS4B对阿魏酸降解的可能途径是非氧化脱羧形成香草醛,再氧化形成香草酸,脱甲基后形成原儿茶酸,最后原儿茶酸苯环裂解后分解为水和二氧化碳,最终实现阿魏酸的降解。

关键词：阿魏酸自毒物质生物降解降解特征途径