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不同月龄苏淮育肥猪纤维表观消化率、肠道长度与微生物差异分析

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南京农业大学学报 2024年第1期47卷 105-112页

作者：杜陶然牛清蒲广李开军刘根盛牛培培张总平李强李平华黄瑞华南京农业大学养猪研究所江苏南京210095 南京农业大学淮安研究院江苏淮安223001 淮安新势畜牧服务有限公司江苏淮安223001 淮安市淮阴新淮种猪场江苏淮安223322 上海市农业科学院上海201106

[目的]本试验旨在探究不同月龄苏淮育肥猪耐粗饲特征(以纤维表观消化率为评定表型)、肠道发育及肠道微生物的差异,并分析肠道发育及微生物与纤维表观消化率的相关性。[方法]试验选取82头出生条件相近的苏淮猪,在相同饲养环境下饲养,分别... 详细信息

[目的]本试验旨在探究不同月龄苏淮育肥猪耐粗饲特征(以纤维表观消化率为评定表型)、肠道发育及肠道微生物的差异,并分析肠道发育及微生物与纤维表观消化率的相关性。[方法]试验选取82头出生条件相近的苏淮猪,在相同饲养环境下饲养,分别在7、8月龄时进行屠宰。采集结肠后端内容物样品并测定不同月龄结肠后段各营养成分的表观消化率;测定肠道长度、周长,分析不同月龄苏淮育肥猪肠道营养成分表观消化率和肠道发育差异,并进行消化率与肠道长度、周长的相关性分析。同时,分别在7、8月龄猪中选取高纤维消化率组和低纤维消化率组各5头进行盲肠、结肠内容物常见纤维分解菌的丰度分析。[结果]8月龄苏淮猪的粗纤维、中性洗涤纤维、酸性洗涤纤维、粗蛋白和粗脂肪的表观消化率均显著高于7月龄(P<0.05),但8月龄苏淮猪大肠、小肠及整个肠道长度、盲肠、结肠周长与7月龄间无显著差异。盲肠周长与粗纤维、酸性洗涤纤维和粗脂肪的表观消化率呈显著正相关(P<0.05)。7月龄和8月龄苏淮猪的盲肠、结肠白化瘤胃球菌和柔嫩梭菌的丰度在高、低纤维消化率组间均无显著差异。7月龄苏淮猪的结肠柔嫩梭菌丰度在高、低纤维消化组均显著高于盲肠(P<0.05)。8月龄苏淮猪结肠柔嫩梭菌丰度在低纤维消化率组显著低于7月龄(P<0.05)。[结论]不同月龄苏淮猪耐粗饲特征不同,随月龄的增加,苏淮猪的消化性能逐渐完善,8月龄苏淮猪各营养成分表观消化率显著高于7月龄,且其纤维消化率与盲肠周长呈显著正相关,但肠道内容物中白化瘤胃球菌和柔嫩梭菌可能不是影响其纤维消化的关键微生物。

关键词：苏淮猪耐粗饲日龄表观消化率肠道发育肠道微生物

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Yr5-virulent races of Puccinia striiformis *** possess relative parasitic fitness higher than current main predominant races and potential risk

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Journal of Integrative Agriculture 2024年第8期23卷 2674-2685页

作者： gensheng Zhang Mudi Sun Xinyao Ma Wei liu Zhimin Du Zhensheng Kang Jie Zhao State Key Laboratory of Crop Resistance and High-Efficiency Production College of Plant ProtectionNorthwest A&F UniversityYangling 712100China

Wheat stripe rust,caused by Puccinia striiformis ***(Pst),is one of the most destructive fungal diseases of wheat,and seriously threatens safe production of the crop *** China,new races historically appeared and rapidly developed to be predominant races and have resulted in ineffectiveness and replacement of wheat resistance cultivars as well as massive reduction in *** the present study,the relative parasitic fitness of the two newlyemerged Yr5-virulent races(TSA-6 and TSA-9)were compared with those of four currently predominant Chinese races(CYR31,CYR32,CYR33,and CYR34)based on evaluation on 10 Chinese wheat *** a result,there were significant differences in the relative parasitic fitness parameters among overall tested races based on multiple comparison(LSD)analysis(PTSA-9(0.95)>TSA-6(0.92)>CYR34(0.29)>CYR31(–1.54)>CYR33(–1.77).The results indicated that two Yr5-virulent races TSA-9 and TSA-6 possessed relative parasitic fitness higher than races CYR34,CYR31,and CYR33,but lower than race CYR32,and have potential risks in developing to be predominant ***,continual monitoring of both Yr5-virulent races,and their variants is *** use of wheat cultivars(lines)with Yr5 resistance gene singly in wheat breeding is essential for being avoided,and is suggested to combine with other effective stripe rust resistance genes.

关键词： wheat stripe rust Puccinia striiformis f.sp.tritici parasitic fitness Yr5 new race

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基于BIM仿真的复杂空间岸坡施工技术应用

水运工程 2024年第10期 194-199页

作者：刘根生计焕潘子煜李烈顺陈灿奕危伟黄筱云黄伦超广州打捞局广东广州510290 江西省港口集团有限公司江西南昌330008 长沙理工大学水利与环境工程学院湖南长沙410114

为解决内河框架式码头筑岛法施工后期岸坡施工的难题,依托宜春港樟树港区河西作业区综合码头工程,运用BIM技术开展筑岛、填土开挖与岸坡抛石的施工仿真,提出“开挖填土分区作业、水陆协同、护岸抛石自卸与网兜相结合”的技术方案。工程... 详细信息

为解决内河框架式码头筑岛法施工后期岸坡施工的难题,依托宜春港樟树港区河西作业区综合码头工程,运用BIM技术开展筑岛、填土开挖与岸坡抛石的施工仿真,提出“开挖填土分区作业、水陆协同、护岸抛石自卸与网兜相结合”的技术方案。工程实践表明,与钢平台法相比,筑岛法施工节省总工期约40 d,节约施工成本约700余万元,其中,复杂空间岸坡施工新工艺缩短工期10 d。研究成果可为类似工程提供参考。

关键词：内河框架式码头筑岛法复杂空间岸坡施工 BIM仿真

Handling Observations with Low Interrater Agreement Values

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Journal of Analytical Sciences, Methods and Instrumentation 2011年第2期1卷 9-18页

作者： gensheng liu Mohammad M. Amini Emin Babakus Marla B. Royne Stafford Department of Marketing & Supply Chain Management University of Memphis Memphis USA

Considerable research has been conducted on how interrater agreement (IRA) should be established before data can be aggregated from the individual rater level to the organization level in survey research. However, little is known about how researchers should treat the observations with low IRA values fail to meet the suggested standard. We seek to answer this question by investigating the impact of two factors (the relationship strength and the overall IRA level of a sample) on the IRA decision. Using both real data from a service industry and simulated data, we find that both factors affect whether a researcher should include or exclude observations with low IRA values. Based on the results, practical guidelines on when to use the entire sample are offered.

关键词： Interrater Agreement Aggregation Survey Research

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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新型直流杂散电流强制排流器的研发与应用

石油库与加油站 2020年第6期29卷 6-11,I0002页

作者：夏惠芳刘根胜中国石化北京石油分公司北京100022 河南省中奥管道工程技术有限公司河南濮阳457000

针对地铁/轻轨等直流供电设备在运行期间给供电线路附近的埋地金属管道造成严重的杂散电流干扰、管道腐蚀和安全隐患,现有接地排流、直接排流、极性排流、强制排流四种排流技术分别存在不同缺陷的问题,研制出一种新型直流杂散电流强制... 详细信息

针对地铁/轻轨等直流供电设备在运行期间给供电线路附近的埋地金属管道造成严重的杂散电流干扰、管道腐蚀和安全隐患,现有接地排流、直接排流、极性排流、强制排流四种排流技术分别存在不同缺陷的问题,研制出一种新型直流杂散电流强制排流器。该强制排流器基于电流吸收和补偿原理,通过实时监测管道上杂散电流流动引由的管地电位变化及强度和强制排流器核心算法控制,由控排系统的杂散电流吸收或补偿单元进行闭环回路控制,以此消除或减低管道上的直流杂散电流。该装置经现场应用验证,达到了预期效果,具有较高的推广应用价值。

关键词：新型直流杂散电流强制排流器研发应用

一种融合知识图谱的图注意力神经网络谣言实时检测方法

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数据分析与知识发现 2024年第6期8卷 95-106页

作者：王根生朱奕李胜江西财经大学国际经贸学院南昌330013 江西财经大学人文学院南昌330013 江西财经大学财税与公共管理学院南昌330013

【目的】提高社交媒体中谣言实时检测的准确率,降低谣言传播危害。【方法】提出一种融合知识图谱的图注意力神经网络谣言实时检测方法。首先,通过知识蒸馏从外部知识图谱中获取文本内容的背景知识;其次,通过点互信息把文本和背景知识转... 详细信息

【目的】提高社交媒体中谣言实时检测的准确率,降低谣言传播危害。【方法】提出一种融合知识图谱的图注意力神经网络谣言实时检测方法。首先,通过知识蒸馏从外部知识图谱中获取文本内容的背景知识;其次,通过点互信息把文本和背景知识转化为加权图结构表示,利用一种考虑边权重的图注意力神经网络从加权图中学习文本的非连续语义特征;然后,通过预训练语言模型BERT学习文本的连续语义特征,利用嵌入方法把用户和内容统计特征转化为连续向量表示;最后,融合所有特征,输入全连接神经网络中进行谣言检测。【结果】在两个公开的社交媒体谣言数据集PHEME和WEIBO上的实验结果表明,所提方法的准确率分别达到了92.1%和84.0%,优于对比基线方法。【局限】所提方法没有融合帖子中可能附加的图片或视频信息,不能进行多模态融合的谣言检测。【结论】融合背景知识可以补充短文本的语义表示,融合用户和内容统计特征可以辅助文本语义特征作决策,提高检测的准确率。

关键词：谣言实时检测图注意力神经网络知识图谱语义特征统计特征用户特征

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

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