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乳酸菌与纤维素酶对丹参地上部分青贮品质的影响

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草地学报 2024年第10期32卷 3313-3319页

作者：酆炳森刘玉珊刘凌霄王晓韩庆典刘云国临沂大学生命科学学院山东临沂276005 浙江大学山东(临沂)现代农业研究院山东临沂276000 临沂市农业科学院山东临沂276012 平邑县源通中药材科技开发有限公司山东平邑273300

为研究不同添加剂对丹参(Salvia miltiorrhiza Bunge)地上部分青贮发酵品质和微生物群落多样性的影响,以丹参地上部分为材料,自然发酵为对照组,添加乳酸菌(Lactobacillus)(1×10^(8)CFU)、添加纤维素酶(0.1 g·kg^(-1))、组合添加(乳酸... 详细信息

为研究不同添加剂对丹参(Salvia miltiorrhiza Bunge)地上部分青贮发酵品质和微生物群落多样性的影响,以丹参地上部分为材料,自然发酵为对照组,添加乳酸菌(Lactobacillus)(1×10^(8)CFU)、添加纤维素酶(0.1 g·kg^(-1))、组合添加(乳酸菌)(1×10^(8)CFU)、纤维素酶0.1 g·kg^(-1)为试验组,60 d后取样分析其品质及微生物多样性。结果表明:处理组对饲料的粗蛋白、总多糖、乳酸含量和pH值有显著影响。与对照组相比,添加乳酸菌显著提高饲料的粗蛋白含量,显著降低氨态氮/总氮;添加纤维素酶显著提高饲料乳酸含量,降低pH值、氨态氮/总氮;组合添加原饲料粗蛋白含量不变,显著增加可溶性碳水化合物、总多糖、乳酸含量,降低pH值、氨态氮/总氮。发酵显著增加了乳酸杆菌属的相对丰度,降低了链球菌属(Streptococcus)的相对丰度,乳酸杆菌属在发酵过程中起主要作用。总之,处理组均能提高丹参地上部分青贮饲料的品质,组合添加组的丹参地上部分青贮品质最佳。

关键词：丹参地上部分青贮发酵品质微生物多样性

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口服抗凝药物在肥胖人群中的应用

中国心血管病研究 2024年第6期22卷 539-542页

作者：刘昱杉丁瑞恒首都医科大学附属复兴医院肾内科北京市100038

直接口服抗凝药物(DOACs)在治疗静脉血栓栓塞症以及预防非瓣膜性心房颤动患者的缺血性脑卒中的应用越来越广泛。肥胖患者是静脉血栓栓塞和心房颤动的高风险人群,DOACs在肥胖患者的临床应用经验较少,而且其药代动力学不同于正常体重人群... 详细信息

直接口服抗凝药物(DOACs)在治疗静脉血栓栓塞症以及预防非瓣膜性心房颤动患者的缺血性脑卒中的应用越来越广泛。肥胖患者是静脉血栓栓塞和心房颤动的高风险人群,DOACs在肥胖患者的临床应用经验较少,而且其药代动力学不同于正常体重人群,本文基于现有的研究数据对此类患者应用直接口服抗凝药物进行总结,为临床医务工作者提供一定的依据。

关键词：肥胖静脉血栓栓塞心房颤动直接口服抗凝药物

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动态均衡算法对电力数据吞吐优化的研究

四川大学学报（自然科学版） 2024年第4期61卷 155-162页

作者：刘雨杉李英娜陈志祥李进成付国庆昆明理工大学信息工程与自动化学院云南省人工智能重点实验室昆明650500

为了解决DPOS共识算法(Delegated Proof of Stake,股份授权证明机制)吞吐性能不足的问题,本文提出加权指标动态均衡算法(DPOS with weighted Index Dynamically Balancing,DPOS+IDB).该算法首先利用区块链的通道机制,将带有不同标签的... 详细信息

为了解决DPOS共识算法(Delegated Proof of Stake,股份授权证明机制)吞吐性能不足的问题,本文提出加权指标动态均衡算法(DPOS with weighted Index Dynamically Balancing,DPOS+IDB).该算法首先利用区块链的通道机制,将带有不同标签的交易分配到不同的区块链通道中.然后对每一个区块链通道,分别进程参数配置优化.最终,将参数配置优化问题,转化为对多个指标求解整体最优解问题.通过优化参数配置,提高区块链通道的吞吐性能.由于求解过程中,需要在多个指标可行范围内进搜索,求解空间过大.为此,设计动态均衡搜索算法进行求解,利用求解的结果对区块链网络进行优化配置,提高提高区块链网络的性能.仿真表明,对比原始DPOS算法、CE-DPOS(Comprehensive Election-DPOS,综合选举)算法和RC-DPOS(Reputation Classification-DPOS,名誉分级)算法,DPOS+IDB算法在时延、吞吐率有较好的性能表现,并且通讯开销的复杂度由节点数量的平方降低至节点数量的一次方.

关键词：区块链 DPOS 性能优化动态均衡算法

Triterpenoids from the Roots of Craibiodendron henryi ***

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Journal of Integrative Plant Biology 2007年第11期49卷 1615-1618页

作者： Xiang-Zhong Huang yue liu Shi-shan yu You-Cai Hu Jing Qu Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine Ministry of Education & Institute of Matena Medica Chinese Academy of Medical Sciences and Peking Union Medical College Beijing 100050 China

A new triterpenoid, ***-p-coumaroyltaraxerol （1）, along with 11 known triterpenoids, taraxerone （2）, taraxerol （3）, 2α,3β,23,24-tetrahydroxyolean-12-en-28-oic acid （4）, oleanolic acid （5）, β-amyrin （6）, 3β,23-dihydroxylursan-12-en- 28-oic acid （7）, 2α,3β-dihydroxyursan-12-en-28-oic acid （8）, 2α,3β,23-trihydroxyursan-12-en-28-oic acid （9）, 2α,3β,24- trihydroxyursan-12-en-28-oic acid （10）, u rsolic acid （11）, and 3-O-acetylursolic acid （12）, was isolated from Craibiodendron henryi W. W. Smith （Ericaceae）. The structures of these compounds were elucidated on the basis of spectral evidence. Antioxidant activity and vasodilator effect of compound 1 were assessed.

关键词： Craibiodendron henryi W. W. Smith Ericaceae triterpenoids.

Decentralized Primary Frequency Regulation for Hybrid Multi-terminal Direct Current Power Systems Considering Multi-source Enhancement

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Journal of Modern Power Systems and Clean Energy 2024年第3期12卷 958-970页

作者： Jialiang Wu Zhen Wang Ruixu liu yu shan Chenxuan Wang the College of Electrical Engineering Zhejiang UniversityHangzhou 310027China the Economic Research Institute of State Grid Zhejiang Electric Power Co. Ltd.Hangzhou 310016China

Hybrid multi-terminal direct current(MTDC)transmission technology has been a research focus,and primary frequency regulation(FR)improvement in the receiving-end system is one of the problems to be *** paper presents a decentralized primary FR scheme for hybrid MTDC power systems considering multi-source enhancement to help suppress frequency disturbance in the receiving-end *** the converters only need local frequency or DC voltage signal input to respond to system disturbance without communication or a control center,i.e.,a decentralized control *** proposed scheme can activate appropriate power sources to assist in FR in various system disturbance severities with fine-designed thresholds,ensuring sufficient utilization of each power *** better balance FR performance and FR resource participation,an evaluation index is proposed and the parameter optimization problem is further ***,the validity of the proposed scheme is verified by simulations in MATLAB/Simulink.

关键词： Decentralized control scheme primary frequency regulation(FR) rate of change of frequency(ROCOF) system frequency disturbance

Research on Bast Fiber Extracted from the White Bark of Three Species in the Genus Broussonetia

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Chinese Journal of Polymer Science 2024年第6期42卷 729-738页

作者： shan-shan Jin Si-Nong Wang Yan-Yan Huang Jing-yu Zhang Peng liu Hui yu Hong-Dong Zhang yu-Liang Yang Institute for Preservation and Conservation of Chinese Ancient Books Fudan University LibraryFudan UniversityShanghai200433China State key laboratory of Molecular Engineering of polymers Department of Macromolecular ScienceFudan UniversityShanghai200433China

Against the backdrop of a global paper resource shortage,there is a growing need to identify fast-growing tree species capable of producing long-lasting *** plant species namely Broussonetia kazinoki,Broussonetia papyrifera and hybrid paper mulberry,belong to the Broussonetia genus,were collected from China to study their white bark suitability for pulp and *** chemical composition revealed that the holocellulose content in Broussonetia kazinoki and Broussonetia papyrifera was more than 80%.The molecular weight distribution of several holocellulose/α-cellulose is observed by GPC,which allows us to better observe the changes of various components on the molecular *** yield,lignin,whiteness,and molecular weight of the pulps obtained by NaOH treatment were *** microscope was used to characterize the fiber length-width ratio and ***,the improvement of the fiber rigidity method based on the Kratky-Porod chain model makes it more theoretical and further reveals the influencing factors of fiber *** study demonstrates the high potentiality of these three species for papermaking applications.

关键词： Broussonetia genus Cellulose Alkaline pulping Kratky-Porod chain model Fiber rigidity

Influence of the Atlantic Multidecadal Oscillation and Interdecadal Pacific Oscillation on Antarctic surface air temperature during 1900 to 2015

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Acta Oceanologica Sinica 2024年第3期43卷 48-58页

作者： Cuijuan Sui Lejiang yu Alexey yuKarpechko Licheng Feng shan liu Key Laboratory of Marine Hazards Forecasting National Marine Environmental Forecasting CenterMinistry of Natural ResourcesBeijing 100081China Key Laboratory for Polar Science Polar Research Institute of ChinaMinistry of Natural ResourcesShanghai 200136China Finnish Meteorological Institute HelsinkiFI-00101Finland

The importance of the Atlantic Multidecadal Oscillation(AMO)and Interdecadal Pacific Oscillation(IPO)in influencing zonally asymmetric changes in Antarctic surface air temperature(SAT)has been ***,previous studies have primarily concentrated on examining the combined impact of the contrasting phases of the AMO and IPO,which have been dominant since the advent of satellite observations in *** study utilizes long-term reanalysis data to investigate the impact of four combinations of+AMO+IPO,–AMO–IPO,+AMO–IPO,and–AMO+IPO on Antarctic SAT over the past 115 ***+AMO phase is characterized by a spatial mean temperature amplitude of up to 0.5℃over the North Atlantic Ocean,accompanied by positive sea surface temperature(SST)anomalies in the tropical eastern Pacific and negative SST anomalies in the extratropical-mid-latitude western Pacific,which are indicative of the+IPO *** Antarctic SAT exhibits contrasting spatial patterns during the+AMO+IPO and+AMO–IPO ***,during the–AMO+IPO period,apart from the Antarctic Peninsula and the vicinity of the Weddell Sea,the entire Antarctic region experiences a warming *** most pronounced signal in the SAT anomalies is observed during the austral autumn,whereas the combination of–AMO and–IPO exhibits the smallest magnitude across all the *** wavetrain excited by the SST anomalies associated with the AMO and IPO induces upper-level and surface atmospheric circulation anomalies,which alter the SAT ***,downward longwave radiation anomalies related to anomalous cloud cover play a crucial *** the future,if the phases of AMO and IPO were to reverse(AMO transitioning to a negative phase and IPO transitioning to a positive phase),Antarctica could potentially face more pronounced warming and accelerated melting compared to the current observations.

关键词： Atlantic Multidecadal Oscillation(AMO) Interdecadal Pacific Oscillation(IPO) surface air temperature Antarctic wavetrain Rossby wave source

Prediction of bedload transport inside vegetation canopies with natural morphology

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Journal of Hydrodynamics 2024年第3期36卷 556-569页

作者： Li He yu-qi shan Chao liu Hui Cao Xing-nian liu Yakun Guo State Key Laboratory of Hydraulics and Mountain River Engineering Sichuan UniversityChengdu610065China Institute for Disaster Management and Reconstruction Sichuan UniversityChengdu610065China China Yangtze Power Co. Ltd.Yichang443002China Hubei Key Laboratory of Intelligent Yangtze and Hydroelectric Science Yichang443002China Faculty of Engineering and Informatics University of BradfordBradfordUK

Due to vegetation drag and vegetation-generated turbulence,bedload transport in vegetated channels is more complicated than that in nonvegetated *** is challenging to obtain accurate predictions of bedload transport in vegetated *** studies generally used rigid circular cylinders to simulate vegetation,and the impact of plant morphology on bedload transport was typically ignored;these methods deviate from natural scenarios,resulting in prediction errors in transport rates of more than an order of *** study measured bedload transport rates inside ***,*** and *** canopies and in arrays of rigid cylinders for *** impact of plant morphology on bedload transport in vegetated channels was *** the canopies of natural morphology,the primary factor driving bedload transport is the near-bed turbulent kinetic energy(TKE),which consists of both bed-generated and vegetation-generated turbulence.A method was proposed to predict the near-bed TKE inside canopies with natural *** the same solid volume fraction of plants,the transport rate inside canopies with a natural morphology is greater than or equal to that within an array of rigid cylinders,depending on the plant *** finding indicates that plant morphology has a significant impact on transport rates in vegetated regions and cannot be ignored,which is typical in *** classic bedload transport equations(the Meyer-Peter-Müller,Einstein,Engelund and Dou equations),which are suitable for bare channels(no vegetation),were modified in terms of the near-bed *** predicted near-bed TKE was inserted into these four equations to predict the transport rate in canopies with natural morphology.A comparison of the predictions indicated that the Meyer-Peter-Müller equation had the highest accuracy in predicting the transport rate in vegetated landscapes.

关键词： Vegetated landscapes turbulent kinetic energy(TKE) bedload transport plant morphology predictive methods

Efficient Pt/KFI zeolite catalysts for the selective catalytic reduction of NOxby hydrogen

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Journal of Environmental Sciences 2024年第4期138卷 102-111页

作者： Ligang Zhang yulong shan Zidi Yan Zhongqi liu yunbo yu Hong He School of Rare Earths University of Science and Technology of ChinaHefei 230026China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhou 341119China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China

Aiming at purification of NO_(x)from hydrogen internal combustion engines(HICEs),the hydrogen selective catalytic reduction(H_(2)-SCR)reaction was investigated over a series of Pt/KFI zeolite catalysts.H_(2)can readily reduce NO_(x)to N_(2)and N_(2)O while O_(2)inhibited the deNO_(x)efficiency by consuming the reductant H_(2).The Pt/KFI zeolite catalysts with Pt loading below 0.1wt.% are optimized H_(2)-SCR catalysts due to its suitable operation temperature window since high Pt loading favors the H_(2)-O_(2)reaction which lead to the insufficient of *** to metal Pt^(0)species,Pt^(δ+)species showed lower activation energy of H_(2)-SCR reaction and thought to be as reasonable active ***,Eley-Rideal(E-R)reaction mechanism was proposed as evidenced by the reaction orders in kinetic ***,the optimized reactor was designed with hybrid Pt/KFI catalysts with various Pt loading which achieve a high NO_(x)conversion in a wide temperature range.

关键词： Pt/KFI zeolite Pt loading H_(2)-SCR Reaction conditions Kinetics studies