Background:In seasonal,pasture-based,dairy production systems,cows must recover from calving and become pregnant within two to 3 months.To achieve this,the uterus must involute and ovulation must occur and continue at...Background:In seasonal,pasture-based,dairy production systems,cows must recover from calving and become pregnant within two to 3 months.To achieve this,the uterus must involute and ovulation must occur and continue at regular intervals.As these processes are affected by the cows’nutritional or metabolic status post-calving,the objective of this study was to evaluate the effect of cow feeding strategies on uterine health,the length of postpartum anestrous interval,and reproductive outcomes.The treatments consisted of two feeding strategies during late-lactation and early dry period(far-off period;starting 4-month pre-calving)and three close-up dry period feeding regimes(1-month pre-calving)in a 2×3 factorial arrangement.We randomly assigned 150 cows to one of two far-off treatments.During late lactation,the herds(n=75 cows per herd)were either control-fed(Controlfed)or over-fed(Overfed)to achieve a low or high body condition score(4-month pre-calving;BCS;~4.25 and^4.75;10-point scale)at cessation of lactation.Within each of these treatments,three feeding levels were applied during the close-up period(1-month pre-calving):~65%(Feed65),~90%(Feed90),or^120%(Feed120)of metabolizable energy(ME)intakes relative to pre-calving requirements.Results:Uterine health improved(i.e.polymorphonucleated(PMN)cells declined)with increased feeding during the close-up period for cows in the Overfed group.The reverse was evident for the Controlfed group with the greatest PMN at the highest intakes during the close-up period.The postpartum anoestrous interval(PPAI)was shorter in cows from the Overfed group when moderately fed(Feed90)during the close-up period;in comparison,the PPAI was shorter in the Controlfed group,when those cows were overfed in the close-up period(Feed120).The cows in the Overfed treatment had greater conception and pregnancy rates if cows had moderate dry matter intakes(Feed90)during the close-up period;these reproductive variables were less under excessive feed intakes(Feed120);yet,close-up dry matter intake had little effect on conception and pregnancy rates for the Controlfed group.Conclusions:The far-off feeding strategies increased early reproductive outcomes at 3 weeks of mating.Additionally,the interaction between far-off and close-up feeding strategies resulted in high six-week pregnancy rate with a slight restriction during the close-up period but only in the far-off Overfed group.Thus,our hypothesis is supported under these conditions.展开更多
This paper proposes a thorough scheme, by virtue of camera zooming descriptor with two-level threshold, to automatically retrieve close-ups directly from moving picture experts group （MPEG） compressed videos based o...This paper proposes a thorough scheme, by virtue of camera zooming descriptor with two-level threshold, to automatically retrieve close-ups directly from moving picture experts group （MPEG） compressed videos based on camera motion analysis. A new algorithm for fast camera motion estimation in compressed domain is presented. In the retrieval process, camera-motion-based semantic retrieval is built. To improve the coverage of the proposed scheme, close-up retrieval in all kinds of videos is investigated. Extensive experiments illustrate that the proposed scheme provides promising retrieval results under real-time and automatic application scenario.展开更多
Held by China Federation of Literary and Art Circles and organized by China Acrobats Association,close-up magic shows of world-famous magicians in Beijing went smoothly and com- pleted successfully with the cooperatio...Held by China Federation of Literary and Art Circles and organized by China Acrobats Association,close-up magic shows of world-famous magicians in Beijing went smoothly and com- pleted successfully with the cooperation of Beijing TV Station during October 31st and November 4th.There are five magicians invited to the show.They are King of Cards——Mr.Lennart Green from Sweden.King of Coins——Mr.Armando Lucero from U.S.A,Champion of Dutch Magic Convention——Mr. Dan Lefay,Close-up Magic Champion of IBM Internat...展开更多
类脑导航是模拟鼠类感知环境机制提出的一种同步定位与构图(Simultaneous localization and mapping,SLAM)的导航算法。针对复杂环境如室内光线变化导致类脑SLAM导航产生误差的问题,本文提出了基于特征匹配(Speeded up robust features,...类脑导航是模拟鼠类感知环境机制提出的一种同步定位与构图(Simultaneous localization and mapping,SLAM)的导航算法。针对复杂环境如室内光线变化导致类脑SLAM导航产生误差的问题,本文提出了基于特征匹配(Speeded up robust features,SURF)算法的优化类脑SLAM导航模型。该模型通过一套移动视觉系统采集环境信息,构建的局部场景细胞通过SURF特征匹配算法获取到载体在环境中的方向与位置信息;头朝向细胞与位置细胞通过连续吸引子神经网络共同表示载体当前的位姿。利用所获取的位姿与时间信息,通过路径积分计算当前载体在坐标系中所处的位置;最后,构建基于认知点的拓扑经验地图。此外,在局部场景细胞获取环境信息的同时,通过SURF特征匹配算法来进行闭环检测,判断是否需要对当前位置进行修正。本文提出的优化类脑SLAM模型很大程度改进了原有模型在有光线变化的室内情况下易产生场景误匹配的问题,并通过实验验证了本文提出方法的有效性。展开更多
基金supported by New Zealand dairy farmers through DairyNZ Inc.(RD1403)the Ministry of Business,Innovation,and Employment(DRCX1201).
文摘Background:In seasonal,pasture-based,dairy production systems,cows must recover from calving and become pregnant within two to 3 months.To achieve this,the uterus must involute and ovulation must occur and continue at regular intervals.As these processes are affected by the cows’nutritional or metabolic status post-calving,the objective of this study was to evaluate the effect of cow feeding strategies on uterine health,the length of postpartum anestrous interval,and reproductive outcomes.The treatments consisted of two feeding strategies during late-lactation and early dry period(far-off period;starting 4-month pre-calving)and three close-up dry period feeding regimes(1-month pre-calving)in a 2×3 factorial arrangement.We randomly assigned 150 cows to one of two far-off treatments.During late lactation,the herds(n=75 cows per herd)were either control-fed(Controlfed)or over-fed(Overfed)to achieve a low or high body condition score(4-month pre-calving;BCS;~4.25 and^4.75;10-point scale)at cessation of lactation.Within each of these treatments,three feeding levels were applied during the close-up period(1-month pre-calving):~65%(Feed65),~90%(Feed90),or^120%(Feed120)of metabolizable energy(ME)intakes relative to pre-calving requirements.Results:Uterine health improved(i.e.polymorphonucleated(PMN)cells declined)with increased feeding during the close-up period for cows in the Overfed group.The reverse was evident for the Controlfed group with the greatest PMN at the highest intakes during the close-up period.The postpartum anoestrous interval(PPAI)was shorter in cows from the Overfed group when moderately fed(Feed90)during the close-up period;in comparison,the PPAI was shorter in the Controlfed group,when those cows were overfed in the close-up period(Feed120).The cows in the Overfed treatment had greater conception and pregnancy rates if cows had moderate dry matter intakes(Feed90)during the close-up period;these reproductive variables were less under excessive feed intakes(Feed120);yet,close-up dry matter intake had little effect on conception and pregnancy rates for the Controlfed group.Conclusions:The far-off feeding strategies increased early reproductive outcomes at 3 weeks of mating.Additionally,the interaction between far-off and close-up feeding strategies resulted in high six-week pregnancy rate with a slight restriction during the close-up period but only in the far-off Overfed group.Thus,our hypothesis is supported under these conditions.
基金This work was supported by European IST FP6 Research Programme as funded for the Integrated Project:LIVE(No.IST-4-027312).
文摘This paper proposes a thorough scheme, by virtue of camera zooming descriptor with two-level threshold, to automatically retrieve close-ups directly from moving picture experts group （MPEG） compressed videos based on camera motion analysis. A new algorithm for fast camera motion estimation in compressed domain is presented. In the retrieval process, camera-motion-based semantic retrieval is built. To improve the coverage of the proposed scheme, close-up retrieval in all kinds of videos is investigated. Extensive experiments illustrate that the proposed scheme provides promising retrieval results under real-time and automatic application scenario.
文摘Held by China Federation of Literary and Art Circles and organized by China Acrobats Association,close-up magic shows of world-famous magicians in Beijing went smoothly and com- pleted successfully with the cooperation of Beijing TV Station during October 31st and November 4th.There are five magicians invited to the show.They are King of Cards——Mr.Lennart Green from Sweden.King of Coins——Mr.Armando Lucero from U.S.A,Champion of Dutch Magic Convention——Mr. Dan Lefay,Close-up Magic Champion of IBM Internat...
基金National Natural Sciences Foundation of China(Nos.61973281,51821003,51922009)Key Research and Development Project of Shanxi Province(No.202003D111003)+4 种基金Excellent Youngth Foundation of Shanxi Province(No.202103021222011)Foundation of Science and Technology on Electro-Optical Information Security control Laboratory(No.2021JCJQLB055010)Aviation Science Foundation(No.2018ZCU0002)Shanxi Province Key Laboratory of Quantum Sensing and Precision Measurement(No.201905D121001)1331 Project of Shanxi Province。
文摘类脑导航是模拟鼠类感知环境机制提出的一种同步定位与构图(Simultaneous localization and mapping,SLAM)的导航算法。针对复杂环境如室内光线变化导致类脑SLAM导航产生误差的问题,本文提出了基于特征匹配(Speeded up robust features,SURF)算法的优化类脑SLAM导航模型。该模型通过一套移动视觉系统采集环境信息,构建的局部场景细胞通过SURF特征匹配算法获取到载体在环境中的方向与位置信息;头朝向细胞与位置细胞通过连续吸引子神经网络共同表示载体当前的位姿。利用所获取的位姿与时间信息,通过路径积分计算当前载体在坐标系中所处的位置;最后,构建基于认知点的拓扑经验地图。此外,在局部场景细胞获取环境信息的同时,通过SURF特征匹配算法来进行闭环检测,判断是否需要对当前位置进行修正。本文提出的优化类脑SLAM模型很大程度改进了原有模型在有光线变化的室内情况下易产生场景误匹配的问题,并通过实验验证了本文提出方法的有效性。
