The paper studies the surface geometry of globoidal indexing cam by applying the theory of conjugate surfaces and the method of coordinate transformation, presents the equations related to the main inducement curvature of the cam profiles, analysis and deduces the equations of two circumscription curves, which judge if the conjugate surface could mesh properly. some calculate examples and conclusion are given. the surface equation of the globoidal cam and conjugate equation are established
論文首先在分析空間嚙合原理基礎上，採用坐標變換法推導出
弧面分度凸輪的工作廓面方程、嚙合方程和壓力角計算公式，對
弧面分度凸輪的嚙合特性進行了深入的分析和研究，對判斷曲面
能否正確嚙合的依據如兩類界限線方程以及誘導主曲率等進行推導，並給出算例。
The relation of radius of curvature and error as well as formulas of increasing parameters on condition of constant error are diverted. the equation of the line on the center of approximate circular arc is obtained ， and it can avoids the trouble that numerical solution owns possibility of no convergence and simplifies node calculation of non - circular curve
導出了曲率半徑與逼近誤差之間的關系和等誤差條件下的參數遞推公式，建立了通過逼近圓
弧圓心的直線方程和圓心坐標計算公式.按這種方法用圓
弧逼近平面參數曲線，不需要求解非線性方程組，避免了計算可
能不收斂的麻煩，簡化了非圓曲線的節點計算過程
2. 6 2. 7ga, these granitoids are most likely to be derived from the partial melting of hybrids both 2. 6ga metavolcanic materials in archean wutaishan magmatic arc and older continent crustal materials under lower than 1. 2gpa. petrological and geochemical characteristics of wangjiahui granitoid intrusion suggest that is probably fored under post - collisional tectonic background
2 . 1ga在- 3 . 82 - 2 . 80范圍，表明王家會古元古代花崗巖最有可
能形成於大約2 . 6ga五臺山大洋島
弧火山巖物質和更老的陸殼物質在
Based on the principal of fuzzy clustering, the paper puts forward a new method for extracting circular arcs on curves. the proposed method can extract circular arcs accurately, and has been applied to extracting arcs on hipbones contour
根據模糊聚類原理，本文提出了一種用於圓
弧提取的方法，
能精確地提取出曲線中存在的圓
弧，已應用到股骨頭輪廓圓
弧的提取。
It is this release of energy that maintains the arc often seen when a switch is opened in an inductive circuit.
在電感電路中，打開電鍵時，就有這種
能量釋放，引起經常所見的電
弧。
Study on increasing breaking porperties of vacuum interrupter
提高真空滅
弧室分斷性
能的研究
Suitable for mma / co2 / mag / mig / arc gouging welding
可用於高性
能手工焊/ co2 / mag / mig焊和電
弧氣刨等
In order to approach the optimum design of changeover portion structural shapes for submarine ' s different diametral pressure cabins, a new structural type, named the double arc transition form, is introduced based on the analysis of stress concentration, by using the engineering calculation method and finite element mthod
摘要為了探討潛艇不同直徑的耐壓艙室過渡段結構型式的最優設計，利用工程計算方法和有限元方法，分析過渡段結構的應力集中，提出了
能夠使不同直徑圓柱殼光滑過渡的結構形式雙圓
弧式過渡形式。
Black tin coating was prepared by multi - arc ion plating technology, and wear resistance, corrosion resistance, heat - proof property and absorption property of solar spectrum were also discussed
摘要介紹了利用多
弧離子鍍工藝制備黑色氮鈦膜，並對其耐磨損、耐腐蝕、熱穩定性及太陽光譜吸收等性
能進行了研究。
Global left entricular function and remodeling was assessed using ejection fraction, end systolic olume, and sphericity index
採用射血分數、收縮末期容積和
弧形指數（請專家指正評價左心室功
能和結構重構。
Secondly, on the base of the analyzing design characteristic, this paper presents theoretical basis according to " design specification about steel gate in water conservancy and hydropower engineering " ( thereinafter for short specification ). it introduces module design means of hmvcad system. in the light of this means, it develops the module that can design the gate according to original data and specification automatically, the module of making the original design by user ' s experience, the module of majorized adjustment, the module of alarm device
其次，本文在分析了
弧形閘門設計特點的基礎上，按《水利水電工程鋼閘門設計規范》 （ dl t5039 - 95 ，以下簡稱《規范》 ）給出了設計的理論依據，介紹了hmvcad系統的模塊設計方法，據此研製了
能根據原始資料自動按規范設計的程序模塊，以及據用戶經驗進行初步設計、優化調整、預警裝置等功
能模塊。
Study of welding properties of alloy tig welding of cuznal
合金氬
弧焊焊接性
能研究
The linkage of direet acting isolation clearance and vacuum rac exting uishing chamber is adopted. it has the unction of hand operation and clectric operation
採用直動式隔離斷口和真空滅
弧室聯動。具有手動電動功
能。
Wire clipping - ball and high voltage, slow wire sending function developed the arc - starting liability
焊絲削球和高電壓、緩送絲功
能，提高了引
弧的可靠性。
Apply the vacuum arcing chamber, air insulation and includes electric spring operation mechanism so that the product arcing ability is strong, short open circuit times is many, no fire and explosion danger, convenient operation, it is the product of good performance, and strong usefulness
採用真空滅
弧室，空氣絕緣配以電動彈簧操動機構，使得產品滅
弧能力強，短路開斷次數高，無火災爆炸危險，操作方便，是一種性
能優良，實用性較強的產品。
So the development of self - energy sf6 cb is very important. in the paper, the math model of arc - quenching chamber air - pressure character is built on the base of 126kv / 31. 5ka self - energy sf6 cb ' s exploiting, then the theory analysis and calculation is deeply been done for cylinder radius, nozzle spout radius and opening position of moved contact that they have the essential effect for the use of arc energy in the course of opening. arc - quenching chamber parameter is confirmed according to the request of full opening and fault opening when the cb is opening
本文針對126kv31 . 5ka自
能式sf _ 6斷路器的研製，建立了相應的滅
弧室氣壓特性數學模型，對自
能式sf _ 6斷路器開斷過程中電
弧能量利用有重要影響的滅
弧室缸徑、噴口直徑、動觸桿開口位置進行了詳細深入的理論分析和計算，並根據斷路器開斷中的滿容量開斷和近區故障開斷的要求確定了滅
弧室參數。
Based on the comprehensive study on contact erosion and massive tests, it is found that the erosion of cb contacts is dominantly depend on the arcing time and breaking current. this paper analyses the mechanism of electrical arc of vacuum circuit breaker and discusses the primary factores. then this paper put forwardes a way to prognosticates the life exepctancy of electrical endurance of vacuum circuit breaker base on the power of arc
本文分析了真空斷路器的燃
弧機理，探討了影響真空斷路器電壽命的主要因素，指出了原先以開斷電流作為預測真空斷路器電壽命的方法的不足，提出了改進的以燃
弧能量為主要指標的預測方法。
Every person is an arc, and the two who can form a circle are a couple
每個人都是一段
弧，
能剛好湊成一個圓的兩個人是一對
The blasting circuit breaker and the studied self - extinguishing circuit breaker that are in the same voltage level are compared. it proves that the arc energy can be used to help build the pressure of the expansion chamber and extinguishing the arc in order to lessen the driven energy
並且對同等級下壓氣式斷路器和自能式斷路器進行了比較，表明本文所研究的自能式斷路器是可以利用電弧能量熄滅電弧本身達到減小操作功的目的。
