natural period 中文意思是什麼
natural period
解釋
固有周期-
" under the contact signed last thursday in cairo by the ceo of dorad energy, reserve general oren shahor, emg will each year provide 100 million dollars worth of natural gas, for a period of 15 to 20 years, " said dorad spokesman ido tal on monday
按照合同規定， emg方面將會在今後15年到20年的時間里，每年向我方提供價值1億美元的天然氣， 」多拉德公司的發言人伊多塔爾在11日表示。 -
Under natural conditions, the incubation period in feedlot cattle is uncertain in length.
在自然條件下，肥育舍飼牛的潛伏期，還沒有確定。 -
China abounds in resources and occupies an important position in the exploitation and utilization of the global natural resources. because of lacking a distinctive definition of property right for natural resources in china, over a long period of time, the limits of management authorities was indistinctive, and various property right structures occurred. consequently, many problems were resulted such as careless and extensive management of natural resources, serious consumption and wastage of resources etc
長期以來，由於我國自然資源產權界定不清晰，管理權限之間界限不清，出現政出多頭的產權結構，導致自然資源粗放經營，消耗浪費嚴重，所以明確界定我國自然資源的產權歸屬，建立有中國特色的自然資源產權制度就刻不容緩。 -
Within massive sandstone outcrops, above comparatively dense forest, are five clusters of natural rock shelters, displaying paintings that appear to date from the mesolithic period right through to the historical period
在密林中大量沙石巖中，有五組天然石窟，裏面巖畫的歷史從中石器時代一直延續到文明歷史時代。 -
Based on extensive investigation of construction technique history of chinese ancient buildings, the structure method, structure developing history and seismic behavior of chinese ancient timber structure buildings are analyzed in several respects of the structural system and form. through a series of experiments on constituent parts of chinese ancient timber building structure, including the tests on the corbels and brackets called dougong subjected to low cyclic reversed loadings, the tests on the wooden frame using the tenon - mortise joints as connections of column and beam subjected to low cyclic reversed loadings, the tests on vibration isolation effect of friction and slippage between column footing and their socle base, and a series of shaking table tests on a chinese ancient timber structure palace building mode under artificial earthquake at serving conditions, destroyed conditions and reinforced conditions, many valuable results of structures such as moment - curvature hysteretic loops of dougong structure and tenon - mortise joints under low cyckc reversed loadings, the static function, the seismic performance, energy dissipation, vibration reduction, energy - loss mechanism, nechanicalmode and failure mode were studied. aplenty of valuable parameters of the structure system were obtained, such as the natural period of structure, vibration modes, damping ratio, factor of vibration isolation, oscillate amplitude of ineitial accebration, velocity and displacement, magnitude of slippage, and the mechanism of structure failure and collapse etc. based on these research, the complete analysis of ancient timber structure under earthquake were carried out in which including mechanism analysis method, calculating mode, strength analysis of members and joints, strengthening methods for serving damaged ancient timber structure buildings were also taken into account
依照宋代《營造法式》建造了抬梁式殿堂木結構構件及結構模型，對中國古代木結構中的典型構造如：柱腳在礎石頂面平擱簡支、柱架榫卯連接、柱高不越間之廣、側腳、生起、斗拱等的構造機理及結構功能進行了量化分析和實驗研究： （一）通過木柱石礎靜摩擦試驗，測定了柱腳與石礎古鏡面間的摩擦系數及摩擦力隨上部結構荷載變化的規律； （二）通過單柱承載力試驗，測定了古建築中木柱的受力變形特徵、破壞模式、及模型材料的變形模量、極限承載力、極限變形等參量； （三）通過柱架低周反復荷載試驗，測定了柱架的抗側移剛度、柱架恢復力特性及滯回曲線、榫卯張角剛度及其變化規律、柱架及榫卯的極限承載力和極限變形、及榫卯減振參數； （四）通過斗?低周反復荷載試驗和受壓試驗，測定了古建築木構件與木構件間摩擦系數，斗?抗側移剛度，斗?恢復力特性及滯回曲線，斗?抗壓極限承載力及受力變形規律； （五）通過抬梁式殿堂間架模型振動臺試驗，測定了殿堂木構架結構自振周期，地震反應振形、阻尼特性及阻尼比；按結構分層特點對柱腳、柱頭和斗?層上的屋蓋的地震反應採用多點同步測量，對柱根滑移、榫卯變形、斗?的變形、復位、耗能減振參數等進行了定量分析。 -
In this paper two - generation reproduction toxicity of fenvalerate, a - cypermethrin, chlorpyrifos, and triazophos was tested in a 21d period with water flea, daphnia magna, . the toxicity indicator included longevity, body length, days to first brood, days to first pregnancy, number of youth per female, intrinsic rate of natural increase ( r ), and number of broods per female. accordingly, the dose - response relations and relations between the chronic responses and enzyme levels were investigated
為了確定水蚤體內生化指標與慢性毒害效應之間的關系，特別是在低濃度暴露狀態下生化指標改變的生物學意義，以便能更準確預測早期農藥對水蚤種群的潛在危害，本文以浙江省常用殺蟲劑氰戊菊酯、高效氯氰菊酯、三唑磷和毒死蜱進行了大型蚤（ d . magna ）的急性和慢性毒性試驗（包括子代水蚤的恢復試驗） 。 -
According to the question of using natural cooling will prolong the period of opening cylinder for overhaul, we expound three modes for the steam turbine quickly cooled after being stopped, these are vacuum and aeration - cooling, pressure - air cooling and steam 1ing, then analysis and contrast them
摘要針對汽輪機採用自然冷卻方式會延長機組檢修開缸時間的問題，提出了汽輪機停機后的三種快速冷卻方式：抽真空通汽冷卻法、壓縮空氣強迫冷卻法和蒸汽冷卻法，並對這三種方式進行了比較和分析。 -
27 november 1893, to the birth on 29 december 1893 of second and only male issue, deceased 9 january 1894, aged 11 days, there remained a period of 10 years, 5 months and 18 days during which carnal intercourse had been incomplete, without ejaculation of semen within the natural female organ
最後一次同房是一八九三年十一月二十六日，那是第二胎唯一的子嗣於一八九三年十二月二十九日出生的五周前，而此嬰生后十一天即夭折。以後的十年五個月十八天期間，一直未發生完全的肉體關系，再也未往女性天然的器官內射精。 -
This paper bases on the evolved process of environmental conditions during geological period, in west zhuo zi mountain and nearby area. it discusses the evolve process of natural environment before cenozoic era of this area and analyses the relationship between rare phytocoenology and the econological environment conditions of paleoclimate, paleogeology, paleoorganisms before cenozoic era of this area
以西桌子山及其鄰近地區在地質歷史時期環境條件演變過程為主線，論述了該地區在新生代以前的自然環境演變過程，分析總結了西桌子山地區在新生代之前的古氣候、古地質、古生物等生態環境條件與珍稀植物群發生的關系 -
Charactor review in shi shuo xin vu reflects another kind of natural aesthetic consciousness naturally in the period of wei and jin dynasty indirectly
《世說新語》的人物品藻間接反映了魏晉時期的另一種自然審美意識。 -
Furthermore, considered the factor of power balance, keeping alliance period was discussed in two extreme situations : when the members are balanced in power and when they have an obvious disparity in strength. because the characters of each benefit assignment are different, and the stability of each alliance is not the same, this paper draws a conclusion that, in the first situation when they are balanced in power, the simple use of “ grim strategy ” cannot ensure a long - term stability of the alliance ; while the alliance with a great difference in power has a natural stability
並且，本文在發展階段考慮了聯盟方力量對比的因素，分為聯盟雙方力量均衡和力量懸殊的兩種情況，由於其利益分配關系的不同特點，每種情況下聯盟的穩定性是不一樣的，本文得出在力量均衡的博弈下，僅僅運用「殘酷策略」並不能保持聯盟長期的穩定性，而在力量懸殊的情況下，聯盟具有天然的穩定性。 -
By calculating large quantity of examples, this text studies earthquake resistant behavior of tapered portal frame with pined bases and analyzes its natural frequency, natural period of vibration and vibration mode. by comparing interior forces of pillar top, beam end and span midpoint in two conditions that seismic action effect participates combination of forces and not when portal frame is n ' t changed, ensure conditions that combination of seismic action effect has controlling f unction during tapered portal frame design, and tapered portal frame demands anti - earthquake design
本文通過大量算例分析，研究柱腳鉸接楔形變截面門式剛架的抗震性能，並對其自振頻率、振型進行了分析；通過比較地震作用效應參與荷載組合與不參與荷載組合兩種情況下，樑柱截面尺寸不變時，柱上端、梁端、跨中截面處的內力大小，確定在什麼情況下地震作用效應組合起控製作用，變截面門式剛架需要進行抗震設計。 -
I turns out to be that the position and degree of damage can not be well detected only by eigenfrequency, while only can detect if the damage has appeared. however, severe damage can be diagnosed if the modal shape and natural period are used
利用以上指標對試驗構件的損傷進行識別與定位，研究結果表明，僅憑獲取的固有頻率不能準確判斷結構構件的損傷狀態及損傷位置，只能初步判斷結構中是否出現損傷。 -
The natural periods of formal six modes were advanced researched, the floor panel is assumed to be elastic, contrast with the results, first time it ' s found that the third natural period has a small affection considering sshsti. when the axial loads on piles are considered, the other periods in the formal six modes have relative percent variation from 30 % to 60 %, and the relative percent changes small considering different ground
對比分析發現，體系前六階振型中，考慮樓板彈性假定的地基基礎與結構共同作用對第三振型固有周期基本不存在影響，當地基中的群樁考慮軸力時，其它固有周期增大在30 %至60 %之間，且不同地基之間的差異變化較小。 -
At the end of the trial period, the researchers found no changes in natural killer cell activity except in the group taking fish oil
在試驗末期，除了服用魚油的組，研究人員沒有發現自然殺傷細胞活性有變化。 -
Length of navigable inland waterways ： refers to the length of the natural rivers, lakes, reservoirs, canals, and ditches open to navigation during a given period, which enables the transport by ships and rafts
內河航道里程：也稱「內河通航里程」 ，是反映內河水運網規模、水平和發展情況的主要指標；是指在一定時期內，能通航運輸船舶及排筏的天然河流、湖泊水庫、運河及通航渠道的長度。 -
To reproduce the narrow - band response, based on the thought of kanamori etc., the damping ratio and natural period are modified. through this adjustment, the narrow - band response can be reproduced, but for some natural periods the adjustive damping ratio has become negative. the negative damping is strange and can not be explained by the equation of motion for sdof system
為了生成窄頻帶反應，本文根據kanamori等人的方法調整了計算時的阻尼比及自振周期，調整后的單邊差分方法能在共振區域生成很好的窄頻帶反應，但是對一些周期點的阻尼比調整成為了負值，這從系統的動力平衡方程是難以解釋的。 -
( 3 ) furthermore, the stiffness effect induced by the infill walls makes the natural period of the frames decrease, which makes the earthquake forces put on the structures increase
3 .另外，填充墻剛度效應的存在使得結構自振周期減小，從而使作用於整個建築上的水平地震作用增大。 -
Natural period of soil site
動力機器基礎地基固有周期 -
The modification coefficient of the natural period will directly effect the reaction of the reinforced concrete frames under the earthquake, so
周期修正系數的取值將直接影響地震作用下鋼筋混凝土框架的反應。
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