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Improved modified moving average analysis of T-wave alternans using least squares-based curve fitting method

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International Journal of biomathematics 2014年第4期7卷 173-183页

作者： Xiang-Kui Wan kang-Hui Yan ang Li Ming-Hu Wu School of Electrical and Electronic Engineering Hubei University of Technology Wuhan 430068 P. R. China School of Information Engineering Guangdong University of Technology Guangzhou 510006 P. R. China School of Electrical and Electronic Engineering Hubei University of Technology Wuhan 430068 P. R. China

T-wave alternans （TWA） in surface electrocardiograph （ECG） signal is considered a marker of abnormal ventricular function which may be associated with ventricular tachy- cardia. Several methods have been developed in recent years to evaluate the important feature. One such method is known as modified moving average （MMA） analysis, which performs well for different levels of TWA, but it is sensitive to the noise in T-waves. In this paper we propose an improved MMA algorithm, which adds a stage of T-wave curve fitting for the MMA method before intermediate averaging. The curve fitting is performed by means of least square method technique. Our assessment study demon- strates the improved performance.

关键词： Electrocardiograph T-wave alternans modified moving average least squaresmethod curve fitting.

移动床生物膜反应器内典型水质因素对氧转移能力的影响

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青岛理工大学学报 2024年第2期45卷 103-109页

作者：康伟昌吴涛谢东毕学军樊星青岛理工大学城镇污水处理与资源化国家地方联合工程中心青岛266525 青岛首创瑞海水务有限公司青岛266031

在污水处理节能降耗与“双碳”战略背景下,为进一步实现污水处理环节的提质增效与节能降碳,从提高氧转移能力的角度出发,在移动床生物膜反应器内,开展了水质因素对氧转移能力的影响研究,并从气泡Sauter平均直径、气泡平均上升速度和气... 详细信息

在污水处理节能降耗与“双碳”战略背景下,为进一步实现污水处理环节的提质增效与节能降碳,从提高氧转移能力的角度出发,在移动床生物膜反应器内,开展了水质因素对氧转移能力的影响研究,并从气泡Sauter平均直径、气泡平均上升速度和气含率等方面,定量分析了氧转移能力影响机制。结果表明:当十二烷基硫酸钠(SDS)浓度由0增大至10 mg/L时,不同载体填充率条件下的氧转移能力均降低;但当SDS浓度由12增大为20 mg/L时,氧转移能力逐渐提高;生物膜载体的存在削弱了SDS对氧转移能力的影响。当总溶解性固体(TDS)值由2000增大至12000 mg/L时,提高了氧转移能力;当TDS值大于12000 mg/L后,氧转移能力趋于不变。随着pH值增大,提高了氧转移能力。在实际污水处理过程中,根据不同水质条件下的氧转移能力变化,通过调节曝气强度等方式,可降低污水处理环节的能耗与成本。

关键词：移动床生物膜反应器氧转移能力水质表面活性剂总溶解性固体酸碱度

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直流燃烧室内气体辐射换热特性研究

风机技术 2024年第1期66卷 61-68页

作者：毕研策刘雨昂杨卫华孙志刚 College of Energy and Power Engineering Nanjing University of Aeronautics and Astronautics

As one of the core components of aero-engine,the thermal protection scheme of combustion chamber has an important impact on its service *** order to improve the design level of high-performance combustion chamber,the radiation heat transfer characteristics of combustion chamber are studied by experimental *** following results are obtained:1)With the increase of oil-gas ratio,the gas temperature increases first and then tends to be stable,the radiant heat flow increases gradually,the convective heat flow increases gradually and then tends to be stable,and the proportion of radiant heat flow remains basically unchanged;2)With the increase of the inlet temperature,the gas temperature increases gradually,the radiant heat flow,especially in the flame barrel head area,increases significantly,the convective heat flow remains basically unchanged,and the proportion of radiant heat flow increases significantly;3)With the increase of the combustion chamber pressure,the gas temperature increases *** the combustion chamber pressure is low,the radiant heat flow increases sharply with the increase of the pressure;When the combustion chamber pressure is high,the radiant heat flow increases slowly with the increase of the *** convective heat flow gradually decreases and tends to be stable,and the proportion of radiant heat flow gradually increases and tends to be *** study is of great significance to improve the calculation accuracy of radiant heat flow of combustion chamber and the reliability design of thermal protection scheme of combustion chamber.

关键词： Combustion Chamber Radiant Heat Transfer Radiant Heat Flow Oil-gas Ratio

Newcastle Disease in Chickens of Smallholder Farmers at Krang Yov Commune S’ang District,Kandal Province

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Journal of Environmental Science and Engineering(A) 2024年第2期13卷 68-75页

作者： Sokha Thim Chhay Kheang Lim Kroesna kang Sath Keo Vutey Venn Kouch Theng Faculty of Veterinary Medicine Royal University of AgriculturePhnom Penh 12400Cambodia General Directorate of Animal Health and Production Phnom Penh 120603Cambodia Graduate School Royal University of AgriculturePhnom Penh 12400Cambodia

The study was conducted in Krang Yov commune,S’ang district,Kandal province and was conducted in three villages,including Kampong Po,Andong and Svay Damnak *** the total,88 families were selected for interview by using snowball technic of nonprobability *** to the results of the interviews,it showed that the number of farmers who raised chickens and had participated in training was very low number,ranging from 10.71%to 34.38%.For chicken raising system,the free ranging was the most popular by allowing the chicken to scavenge around the village,however,the total confinement was also *** local breed was more popular and the purpose of raising was for selling meat,however there were few households that raised the fighting cock for *** number of chickens owned per household,was mostly less than 20 birds,while,the average number of birds per household ranged from 16.82 birds to 37.66 ***,the average number of birds per household was significant different between the households who have participated in chicken raising training and those who never participated(pbirds and 19.85 birds,*** the chicken feed,most of the farmers in those three villages used the concentration feed to offer the chicken,especially for supplementation,but,the whole rice was also used to supplement *** vaccination for chicken was significant different among the villages(p<0.05),in which the household in Kampong Po village had highest percentage of vaccinating their chicken,40.63%,than those in Svay Damnak and Andong *** Newcastle vaccination was the more popular in those ***,all of the households have experienced with the disease,especially ND(Newcastle Disease)accounting for 67.05%,followed by influenza and fowl *** chicken got sick,most of farmers had treated their chicken with different methods,especially buying the medicine from the store and treatment by themselves were mostly applicabl

关键词： Raising system vaccination biosecurity ND

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山东莱芜地区泉水水化学特征及形成机制

环境化学 2024年第5期43卷 1621-1631页

作者：李波李常锁王楠高帅王昱玮康玉潇胥芹吴迪毕雯雯山东省地质矿产勘查开发局八〇一水文地质工程地质大队济南250014 山东省地下水环境保护与修复工程技术研究中心济南250014 山东省地矿工程勘察院济南250014 山东省水工环地质工程有限公司济南250014 山东省地矿物资有限公司济南250014

基于山东莱芜地区2021年9月泉水普查取样水化学数据,运用数理统计、相关性分析、Piper三线图、Gibbs图及离子比值分析等方法,总结了泉水水化学特征,对其形成机制进行分析.结果表明,泉水整体呈弱碱性,阳离子以Ca^(2+)为主,阴离子以HCO_(... 详细信息

基于山东莱芜地区2021年9月泉水普查取样水化学数据,运用数理统计、相关性分析、Piper三线图、Gibbs图及离子比值分析等方法,总结了泉水水化学特征,对其形成机制进行分析.结果表明,泉水整体呈弱碱性,阳离子以Ca^(2+)为主,阴离子以HCO_(3)−为主,TDS在152.75—982.64 mg·L^(−1)之间,平均值为423.15 mg·L^(−1),为低矿化度水;区内泉水水化学类型以HCO_(3)^(-)Ca型、HCO_(3)·SO_(4)-Ca型、HCO_(3)^(-)Ca·Mg型为主,局部呈点状差异分布;泉水中离子主要来源于水岩相互作用,碳酸盐岩和硅酸盐岩矿物溶解是主要离子来源.同时,区内泉水受人类活动影响明显,NO3−主要来自于农业活动.本研究可为莱芜地区泉水保护与合理规划利用提供依据.

关键词：泉水水化学特征形成机制山东莱芜

数字孪生技术在航天侦察情报保障领域的应用设想

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电讯技术 2024年第6期64卷 989-994页

作者：康圣张静中国人民解放军63921部队北京100010 北京市商业学校北京100010

针对当前航天侦察支援多域联合作战效率低,难以融入多域联合作战的矛盾问题,提出一种航天侦察数字孪生系统及运用设想。利用数字孪生系统能将虚拟域与物理域两个世界双向关联、双向驱动的特性,将航天侦察资源状态向用户透明,并向用户提... 详细信息

针对当前航天侦察支援多域联合作战效率低,难以融入多域联合作战的矛盾问题,提出一种航天侦察数字孪生系统及运用设想。利用数字孪生系统能将虚拟域与物理域两个世界双向关联、双向驱动的特性,将航天侦察资源状态向用户透明,并向用户提供虚拟侦察任务规划能力,为用户更好“知天用天”成为了可能;同时,解放了航天侦察力量生产力,极大减少会商协调的频次,将精力更多用于情报生产。最后,提出了航天侦察数字孪生系统的主要技术需求,为后续的研究和建设提供支撑。

关键词：航天侦察情报支援保障数字孪生技术技术需求

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Tuning the Surface Field by Embedding Cations into Metals to Direct the Reaction Pathway of CO_(2) Electroreduction

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CCS Chemistry 2024年第3期6卷 631-640页

作者： Pei Zhang Meng Zhou Shiqiang Liu Xueqing Xing Jiahao Yang Peng Chen Yaoyu Yin Yingying Cheng Xing Tong Jun Ma Qinggong Zhu Xiaofu Sun ZhongJun Chen Xinchen kang Buxing Han Beijing National Laboratory for Molecular Sciences CAS Laboratory of Colloid and Interface and ThermodynamicsCAS Research/Education Center for Excellence in Molecular SciencesCenter for Carbon Neutral ChemistryInstitute of ChemistryChinese Academy of SciencesBeijing 100190 Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049 Shanghai Key Laboratory of Green Chemistry and Chemical Processes School of Chemistry and Molecular EngineeringEast China Normal UniversityShanghai 200062 School of Chemistry University of Chinese Academy of SciencesBeijing 100049

The creation of universal strategies to affect the reaction route of the electroreduction of CO_(2) is ***,we report the first work to introduce cations into diverse metals such as Cu,bi,In,and Sn via the electroreduction of related metallic oxides in quaternary ammonium surfactant *** to their physical adsorption,cations embedded into the electrodes have a more pronounced impact on the electrical field,which effectively influences the adsorption state of *** the increase of surface field,the hydrogen evolution reaction and*COOH route are significantly reduced,favouring the*OCHO pathway *** a result,hydrogen,CO,and C_(2+)products almost completely vanish at−0.5 V versus RHE in 0.1 M Na_(2)SO_(4)in an H-type cell after enough cations are embedded into the Cu electrode,and the faradaic efficiency of formate rises from 18.0%to 99.5%simultaneously.

关键词： CO_(2)electroreduction tuneable products electrical field reaction pathway cations embedding

水合作用与 pH 调控两性离子聚合物刷的相变行为

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原子与分子物理学报 2024年第4期41卷 11-18页

作者：李康睿李循王书恒刘彼得赵新军李九智伊犁师范大学物理科学与技术学院新疆凝聚态相变与微结构实验室伊宁835000 伊犁师范大学微纳电传感器技术与仿生器械实验室伊宁835000 新疆维吾尔自治区人民医院泌尿外科乌鲁木齐830000

本文基于Flory-Huggins理论,建立理论模型研究水合作用与pH调控两性离子聚合物(ZP)刷的相变行为.理论模型考虑ZP的水合作用,以及ZP刷体系中的静电作用.研究发现,在不同pH条件下,ZP刷的体积分数随着水合作的减弱而的增加.随着pH的变化,Z... 详细信息

本文基于Flory-Huggins理论,建立理论模型研究水合作用与pH调控两性离子聚合物(ZP)刷的相变行为.理论模型考虑ZP的水合作用,以及ZP刷体系中的静电作用.研究发现,在不同pH条件下,ZP刷的体积分数随着水合作的减弱而的增加.随着pH的变化,ZP刷构象随着水合性转变行为明显改变,这是由于pH调控ZP链单体带有过多的净电荷(正电荷或负电荷),致使ZP链内出现静电排斥导致ZP刷溶胀.另外,当ZP链单体呈现过多的净电荷,会在很大程度上决定ZP刷体系静电势,影响ZP刷的相变行为.通过考察体系自由能,我们还发现,ZP刷体系自由能呈现了极大值,随着pH值的变化,自由能呈现的极大值随之改变,由此表明了体系的不稳定性,进而导致ZP刷体系发生相变.

关键词：水合作用与pH 两性离子聚合物(ZP)刷构象转变

发酵大米蛋白、酶解鱼蛋白肽和鱼粉对生长猪有效能和回肠末端氨基酸消化率的影响

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饲料研究 2024年第16期47卷 22-27页

作者：李忠杨凯朱江陈国武柏美娟王婧谭碧娥马晓康湖南农业大学动物科学技术学院湖南长沙410128 湖南普菲克生物科技有限公司湖南长沙410011

试验旨在研究发酵大米蛋白(FRP)、酶解鱼蛋白肽(EHFP)和鱼粉(FM)对生长猪消化能(DE)、代谢能(ME)和回肠末端氨基酸消化率的影响。试验1:选用24头健康的“杜×长×大”三元杂交去势公猪,平均体重(15.27±1.12)kg,随机分为对照组(基础饲粮... 详细信息

试验旨在研究发酵大米蛋白(FRP)、酶解鱼蛋白肽(EHFP)和鱼粉(FM)对生长猪消化能(DE)、代谢能(ME)和回肠末端氨基酸消化率的影响。试验1:选用24头健康的“杜×长×大”三元杂交去势公猪,平均体重(15.27±1.12)kg,随机分为对照组(基础饲粮)、FRP组(20%FRP)、EHFP组(20%EHFP)和FM组(20%FM),每组6个重复,每个重复1头猪,采用全收粪法测定其消化能、代谢能和总能的全肠道表观消化率。试验2:选用12头平均体重为(18.36±1.35)kg的装有T型瘘管的“杜×长×大”三元杂交去势公猪,采用4×2尤登方设计,随机分为对照组(无氮饲粮)、FRP组(25%FRP)、EHFP组(30%EHFP)和FM组(20%FM),每组3个重复,每个重复1头猪,采用指示剂法计算氨基酸在表观回肠末端的消化率(AID)在和标准回肠末端的消化率(SID)。结果显示:FPR组生长猪的DE、ME(饲喂基础)分别为19.28、17.64 MJ/kg,EHFP组生长猪的DE、ME(饲喂基础)分别为21.93、19.92 MJ/kg,FM组生长猪的DE、ME(饲喂基础)分别为15.12、13.48 MJ/kg。FRP组、EHFP组的氨基酸SID分别为73.06%~88.66%、87.98%~94.92%。FRP组、EHFP组的DE、ME均显著高于FM组(P<0.05)。除蛋氨酸、丙氨酸、天冬氨酸和脯氨酸外,EHFP组其他氨基酸的SID均显著高于FM组(P<0.05);FRP组的蛋氨酸SID显著低于FM组(P<0.05),苏氨酸、脯氨酸和酪氨酸的SID显著低于FM组(P<0.05)。研究表明,根据有效能和氨基酸SID结果判断,FPR和EHFP可作为新型的优质蛋白饲料应用于猪生产中。

关键词：生长猪蛋白质原料消化能代谢能回肠末端氨基酸消化率

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