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摘要:多年的研究證明,提高光合效率是提高大豆產(chǎn)量的重要途徑。在高產(chǎn)條件下,高光效大豆(Ghycine max L.Merr.)品種與一般品種相比可提高產(chǎn)量30%~40%,表明高光效育種有著廣闊的發(fā)展前景。高光效育種雖然未能縮短育種時間,但為達(dá)到預(yù)定的高光效目標(biāo)提供了“實(shí)時”監(jiān)測,可免除目標(biāo)的偏離,從而達(dá)到高光效與高產(chǎn)的同..
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Governments of most countries seek to encourage Small and Medium Sized Enterprise (SME) growth and the job creation that many believe is fostered by such growth. Substantive growth usually requires expansion capital. It is often perceived that compared with larger firms, SMEs face disproportionat..
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AbstractIn this paper, a medical forceps system with tactile and force feedback ability desired by surgical robots is developed. Bilateral teleoperation systems can decompose into the common and the differential modes in acceleration based controller. The force servoing is attained in the common ..
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Sensor is one kind component which can tansform the physical quantity, chemistry quantity and the biomass into electrical signal. The output signal has the different forms like the voltage, the electric current, the frequency, the pulse and so on, which can satisfy the signal transmission, proce..
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【摘要】本文對一輛車的制動系統(tǒng)中旋轉(zhuǎn)閥瓣接觸兩個固定墊的動力失穩(wěn)性進(jìn)行了研究。在現(xiàn)行的近似幾何中,盤被有限元分析法以帽盤型結(jié)構(gòu)為模型。從參考坐標(biāo)系和移動坐標(biāo)系見的坐標(biāo)變換,對盤和墊之間的接觸運(yùn)動學(xué)進(jìn)行了闡述。通過引入統(tǒng)一的二維網(wǎng)的方法來構(gòu)造閥瓣相應(yīng)的陀螺矩陣。陀螺儀的非保守性制動系統(tǒng)的動力不穩(wěn)定..
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齒輪傳動是機(jī)械設(shè)備中最常見的傳動方式,現(xiàn)代機(jī)械對齒輪傳動的要求日益提高,即要求齒輪能在高速、重載、特殊介質(zhì)等惡劣環(huán)境條件下工作,又要求齒輪裝置具有較高的平穩(wěn)性、高可靠性和結(jié)構(gòu)緊湊等良好的工作性能,由此使得齒輪發(fā)生故障的因素越來越多,而齒輪異常又是誘發(fā)機(jī)器故障的重要因素。因此,齒輪故障診斷技術(shù)的應(yīng)..
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Neil Birtley, FCSD這一章的主旨是 回顧造型設(shè)計(jì)師和空氣動力分析師的角色 概述從概念到最后設(shè)計(jì)的各個設(shè)計(jì)階段 證明機(jī)械工程師和造型設(shè)計(jì)師前后協(xié)同工作的必要性4.1簡介除了設(shè)計(jì)師的草圖的常規(guī)外觀和專業(yè)汽車出版社里的油膩模型,這個主題在其他地方很少被寫到。汽車設(shè)計(jì)師的工作仍然得到很多..
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Gear mechanisms are used for transmitting motion and power from one shaft to another by means of the positive contact of successively engaging teeth. In about 2,600B.C., Chinese are known to have used a chariot incorporating a complex series of gears like those illustrated in Fig.2.7. Aristotle, ..
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1.介紹在相同的車艙內(nèi)可以裝載各種尺寸的貨物(產(chǎn)品),車廂可能有相同或不同的裝配能力。貨車帶有車廂,以便于卸載和加載滿包裝和空包裝的產(chǎn)品到達(dá)目的地?瞻b物的產(chǎn)品被作為循環(huán)再利用的資源,這類型的運(yùn)作要求貨車向一個繁忙鬧市區(qū)配送,使其始發(fā)地到目的地的距離最短。因此,在繁忙的市中心區(qū),車廂的使用使貨車..