查询词典 geometrical mean

One strategy of approximating fitness value is presented, which is to substitute the mean center with the Weber center, and so the fitness value is to minimize the sum of distances between all clients and their corresponding mean centers, and also author makes an experiment to verify the hypothesis that the Weber point is very near to the mean point in planar space.

分别采用了遗传算法和模拟退火算法进行两个多韦伯问题的实例研究。

The measurement system error model analysis is introduced into power system real time network state analysis as an important part for the first time, which can improve on the state estimation quality and provide the capability to monitor the operation of the measurement system; 2. The theory and algorithm of the on-line estimation and update of measurement noise variance based on the relation between the residual variance and noise variance. The statistic properties of the sample variance are discussed and the relation between the estimation precision and sample size under given confidence level is derived; 3. The theory and algorithm of detection and identification of measurement bias are presented, which is based on the relation between residual mean and noise mean. The statistic properties of sample mean are discussed and the relation between estimation precision and sample size is derived; 4. The Givens orthogonal transformation algorithm is selected to be the essential algorithm of state estimation, the fast orthogonal transformation algorithm with damp factor and the algorithm which can handle the zero injection measurements efficiently are presented; 5. The quantity analysis theory of bad data detectivity and identifibility are presented, which describes the relation between the elements in matrix W〓 and bad data amplitude and can provide the theory base for measurement system design and valuation.

一、首次将量测系统误差模型分析做为一个环节引入电力系统实时网络状态分析中，为EMS系统增加了实时监视系统运行、修正量测系统误差模型的新功能，进一步发挥了实时网络状态分析应用软件的潜力；二、首次提出了应用样本方差在线估计与修正量测系统误差方差的基本理论，讨论了样本方差的统计性质和概率分布，推导出了样本容量、估计精度和置信度之间的关系，给出了在线估计与修正量测系统误差方差的算法；三、首次提出了应用样本均值在线检测与辨识量测偏差的基本理论，讨论了样本均值的统计性质，推导了样本容量、估计精度和置信度之间的基本关系，给出了在线检测与辨识量测偏差的算法；四、在状态估计算法设计中，以Givens变换算法做为基本算法，提出了快速正交变换阻尼因子法和可以有效地处理零注入量测的混合法，并对实时应用中的一些问题进行了讨论；五、提出了不良数据可检测性与可辨识性的定量分析理论，揭示了描述量测系统配置、网络结构与参数的残差灵敏度矩阵中的元素与不良数据的幅值在可检测、可辨识能力上的定量关系，为量测系统配置设计与评价提供了理论基础；六、综合国内外最新研究成果，采用自适应自回归预测技术和稀疏矢量技术，构造了较完善的不良数据检测与辨识算法。

In this article, the effect on the surface topography of the same material was analyzed by different processing methods, the value of surface parameter arithmetic mean R, root-mean-square roughness R and gradient root-mean-square value Z were used to appreciate the surface topography, and the data were processed with the software Matlab.

分析不同加工方法对同一种材料表面形貌的影响，采用表面形貌统计参数中的轮廓高度算术平均值R、轮廓高度均方根值R、坡度均方根值Z，对表面形貌进行评价，结果表明，准分子激光加工表面的R、R，和Z，值均比研磨加工表面小。

Days early morning 6:35 minutes, we're a family five human follow Pittsburgh in family drive car for setout, to 11:00 left-right arrive the Washington,settle down in the Pennsylvania / 14St St mouth the Marriott Hotels 851# room (that's us at a week before for place an order ), undergo have a lunch and have a little rest after, we're mean go to and live place only a arrow could farthe visitor House center, understand tomorrow the visit receive ticket etc things, the after because times for early mean think to Nearby the make money factory, oppose fascist exhibition place to for look-look, but all because the days visit ticket all already for end then do that's all, follow us mean to Nearby the Korea , Viet-Nam war mark stele go to stroll know clearly stroll, the first number compare near distance the looked to Washington commemorate mark, white house......

1998年4月10日是美国的复活节，4月11日是踰越节，各单位看来都放假两天，我们的NU婿，NU儿专程带领我们到华盛顿特区游览。10日清晨6点35分，我们一家5口由匹兹堡家中驱车出发，至11点左右抵达华盛顿，下塌于宾夕法尼亚街/14街街口的Marriott Hotels 851#房，经午餐及稍事休息后，我们就前往与住地仅一箭之遥的白宫参观接待室，了解明天的参观领票等事宜，之后因时间尚早就想到附近的造币厂，反法西斯展览馆去看看，但均因当天的参观券都已发完而作罢，接着我们就到附近的朝鲜，越南战争纪念碑去逛了逛，第一次较近距离地见到了华盛顿纪念碑，白宫。。。。。。

Finally we derive the equivalent transfer functions using reduction rules and interesting important performance indices, for example, steady probability, mean first and nth passage time, mean recurrence time, the mean sojourn time, and counters of the transition and place can be find.

最后用化简规则获得等效传递函数，求出我们关心的重要参数的数值。

The mean age was 40 days and the mean body weight was 3.77kg. Under epidural anesthesia and tracheal intubation, carbon dioxide was insufflated into abdominal cavity via a Veress needle, reaching a insufflation pressure of 10-14 mmHg. One umbilical camera port and two subcostal instrument ports were made. Results The mean operative time was 37 minutes.

在气管插管＋单次硬膜外麻醉下，脐上皮肤小切口，Veress针穿刺入腹，注入CO2，建立气腹，压力为10～14mmHg(1.33～1.86kPa)，此处置一4mm套管，放入腹腔镜，直视下左右上腹各置一套管，放入操作器械，完成幽门环肌切开。

Using Hwa-Lien and Wu-Feng-Shan radar data set respectively, the mean tangential wind component of Nock-Ten has been retrieved by original GBVTD method. It is found that the retrieved maximum mean tangential wind from HL is 14 m s-1 less than that solved by WFS data set. This large difference has been attributed to significant mean wind component perpendicular to the line connecting the radar and the typhoon center.

利用五分山和花莲雷达观测资料，分别透过GBVTD计算其轴对称切向风，结果显示，两座雷达计算之轴对称切向风最大值相差达14 m s-1，而这样的差异可归因於纳坦台风平均风垂直雷达观测分量较为显著所造成。

The dissipation factor tip-up D tan d , the change of capacitance D C / C 0, the maximum discharge q max and the mean discharge magnitude q mean , A compared investigation of the correlations between V min , V av and service time were compared with those between D tan d , D C / C 0, q max, q mean and respectively.

对大量的不同运行年数的线棒进行了超声波 V min 和 V av 测量，以及介质损耗角增量 D tan d 、电容变化率 D C / C 0、最大放电量 q max 和平均放电量 q mean 等电气测量试验，对比研究了超声参数( V min 和 V av )和电气测量参数( D tan d 、 D C / C 0、 q max 和 q mean )与运行年数的相关性，发现， V min 和 V av 与的相关性很强，相关系数 R 分别为0.892和0.890，而 D tan d 、 q max 和 q mean 与的相关性较弱， R 在0.55~0.60范围内， D C / C 0与几乎没有相关性， R 仅为0.310；采用线性回归分析，分别建立了 V min 和 V av 与的二阶和三阶线性函数的数学模型， R-S 分别为0.828和0.903，并分别提出了最可靠运行年数和置信度为95％的可靠运行年数的预测方法。

Males had a mean TL of 329 mm ( n = 192), females had a mean TL of 308 mm ( n = 166), and an additional 56 fish were unsexed (mean TL = 239 mm).

鱼全长范围是78～442mm ，雄性平均全场为329mm ，雌性平均全长308mm ，56条鱼未能鉴别性别（平均全长239）。

Pre-operative audiometric testing revealed a mean air conduction pure tone average of 51.93 dB and a mean bone conduction PTA of 23.17 dB. The mean post- operative air conduction and bone conduction PTA were 36.59 dB and 24.23 dB, respectively.

术前临床测试平均气导51.93 dB，平均骨导23.17 dB；术后平均气导36.59 dB，平均骨导24.23 dB，术前、术后骨气导差距分别为28.76 dB和12.36 dB，骨气导差距改善了16.40 dB，68%的病人骨气导差距缩小到20 dB以内，无听力下降者。

Listen,point and check your answers.

听，指出并且检查你的答案。

Warming needle is one of effective treatment methods for knee arthralgia aggravated by cold,and it is simple,safety,so it should be developed in clinical acupuncture and moxibustion extensively.

但以本院科针灸门诊在2005年1月—2006年6月期间共收治膝痛患者100余例，经过临床的诊断后，其中施以温针治疗的48例，疗效显著，报道如下。1临床资料本组病例48