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核黄素对绵羊瘤胃体外发酵参数、酶活性和菌群数量的影响

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动物营养学报 2022年第11期34卷 7240-7248页

作者：任娜郝小燕张暄梓董莹蕊王兴岗张建新山西农业大学动物科学学院太谷030801

本试验旨在研究核黄素(RF)对绵羊瘤胃体外发酵参数、酶活性和菌群数量的影响。采用体外瘤胃发酵法,在精粗比为50∶50的发酵底物中分别添加0(对照)、15、30、45、60和75 mg/kg RF,测定体外发酵48 h后发酵液产气量、甲烷产量、发酵参数、... 详细信息

本试验旨在研究核黄素(RF)对绵羊瘤胃体外发酵参数、酶活性和菌群数量的影响。采用体外瘤胃发酵法,在精粗比为50∶50的发酵底物中分别添加0(对照)、15、30、45、60和75 mg/kg RF,测定体外发酵48 h后发酵液产气量、甲烷产量、发酵参数、酶活性和菌群数量。结果表明:1)与对照组相比,30 mg/kg RF组48 h累积产气量、慢速发酵部分产气量和潜在产气量显著升高(P<0.05)。2)与对照组相比,15、30、45、60和75 mg/kg RF组发酵液pH显著降低(P<0.05),30 mg/kg RF组总挥发性脂肪酸、丙酸、丁酸、戊酸和异戊酸浓度显著升高(P <0.05),75 mg/kg RF组乙酸浓度显著降低(P<0.05),60和75 mg/kg RF组乙酸/丙酸显著降低(P<0.05),45、60和75 mg/kg RF组氨态氮浓度显著提高(P <0.05)。3)与对照组相比,75 mg/kg RF组木聚糖酶活性显著降低(P<0.05),15、30、45、60和75 mg/kg RF组α-淀粉酶活性显著升高(P<0.05),45 mg/kg RF组蛋白酶活性显著升高(P <0.05)。4)与对照组相比,30 mg/kg RF组总细菌、总真菌、总原虫、白色瘤胃球菌、黄色瘤胃球菌、产琥珀酸丝状杆菌、嗜淀粉瘤胃杆菌、栖瘤胃普雷沃氏菌和溶纤维丁酸弧菌数量显著升高(P<0.05)。综上所述,本试验条件下,添加30 mg/kg RF可提高发酵液挥发性脂肪酸浓度、菌群数量和α-淀粉酶活性。

关键词：核黄素绵羊体外发酵酶活性菌群数量

基于真实任务情境的数字化设计与制造技术专业新形态教材开发路径研究及实践

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科教文汇 2023年第15期 74-77页

作者：张波王行刚常州机电职业技术学院江苏常州213164

基于真实任务情境,开展数字化设计与制造技术专业新形态教材开发路径研究,深入挖掘和厘清学习任务情境、新形态教材的生成逻辑和科学内涵,明确我国职业教育教材特征,研究基于真实项目驱动的新形态教材开发方法体系等;加强“双元”新形... 详细信息

基于真实任务情境,开展数字化设计与制造技术专业新形态教材开发路径研究,深入挖掘和厘清学习任务情境、新形态教材的生成逻辑和科学内涵,明确我国职业教育教材特征,研究基于真实项目驱动的新形态教材开发方法体系等;加强“双元”新形态教材的开发与建设,加强校企合作,实现课程内容与岗位标准对接,教学过程与工作过程对接,在提升教师教学能力的同时,实施“课堂革命”,改善原有教法,有效提升高职院校教材开发的实效性,促进“三教”改革。

关键词：任务情境新形态教材数字化设计开发路径

Swarm intention identification via dynamic distribution probability image

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Chinese Journal of Aeronautics 2024年第10期37卷 380-392页

作者： Yinhan wang Jiang wang Shaoming HE Fei wang Qi wang School of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081China Institute of Computing Technology Chinese Academy of SciencesBeijing 100190China

In the realm of decision-making for defense and security applications,it is paramount to swiftly and accurately identify the intentions of incoming *** identification methods predominantly focus on single-target applications and overlook the perturbations introduced by measurement *** this study,we propose a novel concept:the Dynamic Distribution Probability(DDP)image,which is constructed using the estimated state and its covariance *** grayscale pixel value within the image signifies the probability of the presence of the agent within the *** proposed identification scheme integrates the use of Extended Kalman Filter(EKF),Convolutional Neural Network(CNN),Back Propagation(BP)network,and Gated Recurrent Unit(GRU)***,the DDP image is processed through a CNN to distill the formation characteristics,and the estimated swarm state from EKF is inputted into a BP network to deduce the kinematic *** outputs from both networks are summed and subsequently channeled into a GRU network to capture temporal *** numerical simulations and flight experiments are presented to demonstrate the robust anti-noise capability of the proposed scheme compared with conventional methods,as well as its superior training efficiency.

关键词： Intention Identification Kalman filters Convolutional neural networks Swarm intelligence

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端到端的流媒体传输控制技术研究综述

计算机工程与应用 2005年第8期41卷 26-30页

作者：杨传栋余镇危王行刚张俊清中国科学院与中国矿业大学高速计算机网络联合实验室

随着多媒体应用的发展,因特网上的流媒体传输技术已成为研究热点。在因特网上传输音频或视频流需要有带宽、延迟、丢包率等诸多的QoS要求,但当前的因特网并不提供任何QoS保证,这对流媒体在因特网上的传输提出巨大挑战。该文从端到端的... 详细信息

随着多媒体应用的发展,因特网上的流媒体传输技术已成为研究热点。在因特网上传输音频或视频流需要有带宽、延迟、丢包率等诸多的QoS要求,但当前的因特网并不提供任何QoS保证,这对流媒体在因特网上的传输提出巨大挑战。该文从端到端的传输控制技术角度入手,给出了一个因特网上流媒体传输的总体框架,然后依此框架为线索,对流媒体传输所必需的协议栈、拥塞控制、自适应速率编码、速率整形、差错控制等技术的研究进展进行了概括总结并进行了对比,同时提出了进一步的研究建议。

关键词：流媒体因特网拥塞控制差错控制

The reformation of catalyst:From a trial-and-error synthesis to rational design

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Nano Research 2024年第4期17卷 3261-3301页

作者： Ligang wang Jiabin Wu Shunwu wang Huan Liu Yao wang Dingsheng wang Department of Chemistry Tsinghua UniversityBeijing 100084China

The appropriate catalysts can accelerate the reaction rate and effectively boost the efficient conversion of various molecules,which is of great importance in the study of chemistry,chemical industry,energy,materials and environmental ***,efficient,environmentally friendly,and easy to operate synthesis methods have been used to prepare various types of *** previous studies have reported the synthesis and characterization of the aforementioned catalysts,more still remain in trial and error methods,without in-depth consideration and improvement of traditional synthesis ***,we comprehensively summarize and compare the preparation methods of the trial-and-error synthesis strategy,structure–activity relationships and density functional theory(DFT)guided catalysts rational design for nanomaterials and atomically dispersed *** also discuss in detail the utilization of the nanomaterials and single atom catalysts for converting small molecules(H_(2)O,O_(2),CO_(2),N_(2),etc.)into value-added products driven by electrocatalysis,photocatalysis,and ***,the challenges and outlooks of mass preparation and production of efficient and green catalysts through conventional trial and error synthesis and DFT theory are featured in accordance with its current development.

关键词： trial-and-error synthesis structure–activity relationships density functional theory(DFT)guidance nanomaterials atomically dispersed catalysts

Numerical Analysis of PRISM-PY Calculations for Hard-and Soft-Core Generic Polymer Models

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Chinese Journal of Polymer Science 2024年第4期42卷 532-543页

作者： Qiang wang Department of Chemical and Biological Engineering Colorado State University1370 Campus DeliveryFort CollinsCO80523-1370USA

Generic polymer models capturing the chain connectivity and excluded-volume interactions between polymer segments can be classified, according to whether or not the 3D integral of the latter diverges, into hard- and soft-core models. Taking homogeneous systems of compressible homopolymer melts (or equivalently homopolymer solutions in an implicit, good solvent) in the continuum as an example, we recently compared the correlation effects on the structural and thermodynamic properties of the hard- and soft-core models given by the polymer reference interaction site model (PRISM) theory with the Percus-Yevick (PY) closure (Polymers 2023, 15, 1180). Here we analyzed in detail the numerical errors and behavior of the interchain pair correlation functions (PCFs) given by the PRISM-PY calculations of these models using an efficient numerical approach that we proposed. Our numerical approach has the least number of independent variables to be iteratively solved, analytically treats the discontinuities caused by the non-bonded pair potential (such as that of the hard spheres) and takes only the inverse Fourier transform of the interchain indirect PCF between polymer segments (which is continuous and decays towards 0 with increasing wavenumber much faster than both the interchain direct and total PCFs), and is essential for us to accurately solve the PRISM-PY theory for chain length N as large as 106. To capture the correlation-hole effect, the real-space cut-off in the PRISM calculations should be proportional to the square root of N.

关键词： Generic polymer models Soft potentials Polymer reference interaction site model theory

Linear-Quadratic Pareto Cooperative Game for Mean-Field Backward Stochastic System

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Journal of Systems Science & Complexity 2024年第3期37卷 947-964页

作者： wang Yu School of Control Science and Engineering Shandong UniversityJinan 250061China

This paper focuses on a Pareto cooperative differential game with a linear mean-field backward stochastic system and a quadratic form cost functional. Based on a weighted sum optimality method, the Pareto game is equivalently converted to an optimal control problem. In the first place,the feedback form of Pareto optimal strategy is derived by virtue of decoupling technology, which is represented by four Riccati equations, a mean-field forward stochastic differential equation(MF-FSDE),and a mean-field backward stochastic differential equation(MF-BSDE). In addition, the corresponding Pareto optimal solution is further obtained. Finally, the author solves a problem in mathematical finance to illustrate the application of the theoretical results.

关键词： Backward stochastic differential equation linear-quadratic control mean-field Pareto optimality

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基于风险价值的增量配电网效益风险评估

广东电力 2019年第10期32卷 127-132页

作者：王昌照张沛王兴刚王旭云南电网有限责任公司云南昆明650000 北京交通大学电气工程学院北京100044

随着增量配电改革的不断深入,电网公司面临着愈加激烈的市场竞争,在增量配电投资业务上需要评估投资风险。为此,引入风险价值(value at risk,VaR)来量化电网公司在增量配电项目的投资风险。首先基于全生命周期理念构建增量配电网收益模... 详细信息

随着增量配电改革的不断深入,电网公司面临着愈加激烈的市场竞争,在增量配电投资业务上需要评估投资风险。为此,引入风险价值(value at risk,VaR)来量化电网公司在增量配电项目的投资风险。首先基于全生命周期理念构建增量配电网收益模型;然后考虑用电量、运维费率等不确定因素,采用蒙特卡洛法计算资本金净利润率(return on equity,ROE)的概率分布,在一定的置信水平下,通过Cornish-Fisher展开式求取ROE分布的近似分位数;最后根据ROE的近似分位数计算得到增量配电项目的风险价值。通过选取实际增量配电试点进行案例分析,结果表明VaR量化了投资风险,可辅助电网公司在投资增量配电项目时做出合理决策。

关键词：增量配电网收益模型风险评估风险价值

人工智能深度学习对前列腺多序列MR图像分类的可行性研究

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中华放射学杂志 2019年第10期53卷 839-843页

作者：方俊华 Li Qiubai 余成新王兴刚方志华刘涛王良华中科技大学同济医学院附属同济医院放射科武汉430030 Department of Radiology University of Texas Southwestern Medical Center at Dallas Dallas TX USA 湖北省宜昌市中心人民医院放射科 443000 江西省景德镇市浮梁县人民(中医)医院放射影像科 333000 湖北省枝江市中医医院放射科工作 443200

目的开发一种能够自动分辨前列腺多序列MR图像的人工智能(AI)工具。方法回顾性分析2017年5月至2018年12月华中科技大学同济医学院附属同济医院前列腺多序列MR图像。前列腺多序列MR图像的分类由ResNet18卷积神经网络(CNN)模型来实现。运... 详细信息

目的开发一种能够自动分辨前列腺多序列MR图像的人工智能(AI)工具。方法回顾性分析2017年5月至2018年12月华中科技大学同济医学院附属同济医院前列腺多序列MR图像。前列腺多序列MR图像的分类由ResNet18卷积神经网络(CNN)模型来实现。运用深度残差网络提升训练精度和测试精度。所使用的数据集包括19 146张7个前列腺MR序列图像(横断面T1WI、横断面T2WI、冠状面T2WI、矢状面T2WI、横断面DWI、横断面ADC、横断面PWI),选取其中2 800张图像作为训练集,选取剩余图像中的388张图像作为测试集。采用准确度评价ResNet18 CNN模型的效能。结果7个前列腺MR序列(横断面DWI、冠状面T2WI、横断面灌注成像、矢状面T2WI、横断面ADC、横断面T1WI和横断面T2WI)图像测试准确率分别为100.0%(44/44)、77.5%(31/40)、96.7%(116/120)、100.0%(44/44)、100.0%(44/44)、100.0%(52/52)和100.0%(44/44)。横断面PWI的分类0.8%(1/120)被错误地分到了横断面T2WI序列,仅2.5%(3/120)错误地分到矢状面T2WI序列;对于冠状面T2WI的分类15.0%(6/40)被错误地分到了横断面T2WI序列,7.5%(3/40)错误地分到矢状面T2WI序列。结论开发的能够自动分辨前列腺多序列MR图像的AI工具准确率高。

关键词：人工智能深度学习前列腺磁共振成像图像分类