H - helicity 中文 - EN166

helicity n.【物理學】螺旋性。

helicline
In the first part of paper , we introduce the appliance of doppler weather radar in meteorological work in the near future , and simply enumerate all kinds of adjoint methods to retrieve data of radar . in the second part of paper , we choice some methods that are usually used domestically and overseas , compare excellence and flaw of the methods by using data of simulate wind field , analyze synthetically the precision of simulate result , the length of retrieval time and the structure of data distributing , lastly decide to regard ameliorated quasi - 4d adjoint method as retrieval technology in the paper . in the third part of paper , we retrieve the data of single doppler weather radar in hefei , anhui province , then calculate 3d wind field , streamline field , divergence , vorticity , helicity , moisture flux , divergence of moisture flux and potential vorticity from the result of retrieval 文中第一部分對近年來多普勒天氣雷達在氣象工作中的應用作了介紹，同時簡單的羅列了反演雷達資料的各種變分方法；接下來在第二部分選取了幾種國內外常用的反演方法，利用模擬的風場資料比較各種方法的優缺點，從模擬結果的精度、反演時間的長短、資料的分布結構上綜合分析，最后決定將已做改進的準四維變分分析方法作為本文的反演工具；第三部分就是反演安徽合肥多普勒天氣雷達資料，然后由反演得出的風場計算了各個時間各個層次的三維風速、流場、散度、渦度、螺旋度、水汽通量、水汽通量散度和位渦。
Severe cumulus precipitation of 3h center appear in the left side of positive stonn - relative helicity center , i . e . positive storm - relative helicity center is not synchronization with cumulus precipitation center of 3h , the cumulus precipitation center of 3h falls behind the positive storm - relative helicity center 在正的相對螺旋度中心的左側， 3小時后出現3h積云降水量的高值中心，也就是說正的相對螺旋度中心和3h積云降水中心不同步， 3h積云降水中心落后于相對螺旋度中心。
The result indicates that , in the course of the rainstorm in huoshan , there are obvious low - level jet of great intensity , infection of mesoscale shear line , enhancement of plus vorticity which increases intensity of convergence , improves ascending velocity and brings on precipitation , and quick enhancement of helicity which provides the basis to forecast , in addition , convergence of moisture flux and analyzed potential vorticity which reflects baroclinic convective instability sufficiently indicate the characteristics of the rainstorm 結果表明：此次霍山暴雨發生前后，存在明顯的大強度低空急流，并受到中尺度切變線的影響，而且正渦度的加強引起了輻合加劇，提高了上升速度從而引起降水，同時暴雨發生前螺旋度的迅速增強，也為預報提供了根據，另外水汽通量的輻合以及分析位渦反映出的斜壓對流不穩定都充分體現了這次降水的特點。
The results illustrate that in the driven magnetic reconnection process generated by the dawn - dusk electric field in the magnetotail , the transportation of magnetic helicity flux via the boundaries of the system is the direct cause of the change of the total magnetic helicity in the system 研究表明，對于由晨昏電場?生的磁尾驅動重聯過程，通過系統邊界輸運的磁螺度通量是引起系統總磁螺度變化的直接原因。
The various initial distributions of magnetic helicity density and the transportation of magnetic helicity flux may lead to various evolutions of magnetic helicity density in the neutral sheet region , and could result in the formation of various magnetic structures 不同的初始磁螺度密度分布和磁螺度通量輸運，可以引起中性片區域磁螺度密度分布的不同演化，從而導致具有不同拓撲位形磁結構的形成。
On the basis of the former two - dimensions and three - components mhd numerical simulation , this paper analyses evolution of the magnetic helicity of various magnetic structures in the magnetotail 摘要在二維三分量mhd數值模擬的基礎上，對地球磁尾不同類型磁結構的形成作磁螺度分析。
Diagnoses of apparent heat source , apparent moist sink and helicity show that the severe h eavy rainfall is related with them closely 視熱源、視水汽匯和螺旋度的診斷分析表明，暴雨發生與它們密切相關。
The change of the positive stonn - relative helicity value has reflected the severe weak tendency of rainstorm and its system approximately 相對螺旋度值的變化大致反映了暴雨及其系統的強弱趨勢。
The positive storm - relative helicity center is accompany with low - level jet in 850 - hpa isobaric surface fields 通過分析我們發現了正的相對螺旋度中心與850hpa低空急流的演變過程是一致的。
This property , often called “ helicity , “ serves to differentiate the neutrino from its antiparticle 這種性質通常稱為“螺旋性” ，可以用來區分中微子和它的反粒子。
Moisture helicity and its application in diagnostic analysis of a heavy rain in jiang - huai basin 水汽螺旋度及其在一次江淮暴雨分析中的應用
Magnetic helicity and its implication in solarphysics 磁螺度以及在太陽物理上的應用