This paper focuses on the optimal pitch arrangement in double-side heating once-through steam generator with helix tube inside.

本文主要研究了帶內(nèi)螺旋纏繞管的管套管雙面加熱直流蒸汽發(fā)生器元件中沸騰段內(nèi)螺旋管螺距設(shè)置的優(yōu)化問題狠狠社henhen。

This paper gave the detailed reviews on previousresearch results on subdrainage home and abroad,studied the effect and mecha-nism of subdrainage facilities on drainage,waterlogging reduction,salt removeas well as nitrogen fertilizer application under subdrainage conditions by use oflysimeter experiments and field trials.Numerical modelling on water movementin heterogeneons multilayered soils as well as the optimization layout of spacingsand depths of PVC subdrain was also investigated in this paper by numerical sim-ulations.

本文在論述國內(nèi)外暗管排水研究進(jìn)展的基礎(chǔ)上免费黄图视频A片，采用蒸滲儀控制試驗国产操老逼视频，田間試驗和數(shù)學(xué)模型數(shù)值計算相結(jié)合的方法一级黄片久久99，對塑料暗管的排水黄色网站入口观看、降漬久久无码人妻中文系列、除鹽效果及其機理和塑料暗管排降條件下小麥的N肥運籌進(jìn)行了深入研究，并對排降條件下試區(qū)非均質(zhì)分層土壤水分運動的數(shù)值模擬和塑料暗管埋深和間距的經(jīng)濟優(yōu)化布局模式進(jìn)行了探討永久网站。

For the purpose to figure out location and function relations of three-dimensional syphon's unfolded curve with any bend angle, any diameter and any section, and to make integration of design and manufacturing for three dimensional big-diameter syphon, methods of engineering mathematics and analytic geometry are provided. Syphon's unfolded curve function in three-dimensional station is analyzed and built; the corresponding MATLAB procedures are compiled at the same time.

為了解決彎管在彎曲角度免费在线的毛片网站、直徑、節(jié)數(shù)等變化時的三維彎管展平曲線的坐標(biāo)位置以及函數(shù)關(guān)系問題亚洲国产AⅤ美女黄软件网站，以實現(xiàn)大直徑彎管的三維設(shè)計與制造的自動化一级片毛片黄片、一體化，通過利用工程數(shù)學(xué)及畫法解析幾何的方法人人透人人操人人干，分析和建立了彎管在三維狀態(tài)下的展平曲線方程欧美A片大全，同時編寫了相應(yīng)的MATLAB程序。

The thesis discusses three eigenvalues individually and explains the pressure wave propagation of three modes, includes wave speed, wave decay and energy distribution. Since the elastic potential energy occupies more than 98% of mechanical energy in the arteries, which is larger than 2% of kinetic energy of flowing blood. Else join elastic wall and wall of managing having a viscid condition to analysis .

本文將個別討論此三組特徵值日韩精品老熟女视频网站免费，來說明三組壓力波的傳遞模態(tài)免费第一黄色，其中包括波速，以及波的衰減；由於在動脈的能量分布中天堂网黄色视频，由管壁振動的彈性位能占了98%18禁黄网站禁片免费观看女女，遠(yuǎn)超過血液本身流動的2%，再加上管的彈性模數(shù)和管壁的黏滯性再來討論此三組模態(tài)91精品高清在线看入口，個別在彈性管的能量分布日韩无码毛片基地。

Making the calculation and analyze of anticorrosion for inner wall of curved pipe and L pipe.

對簡單類型的管結(jié)點彎管和L型管的內(nèi)壁腐蝕與防護進(jìn)行了計算及分析。

Motheds: to select 336 lomars with pulposis or apicitis from the aged and to devide them into two groups. in group the control group,the illed teeth were given only the root canal therapy. in group the experimental group, according to the difference of every root canal, the unobstructed root canals were treated by root canal therapy. while the obstructed ones were given the root canal resinifying, use two kinds of therapy method together to molais' pathological changes.then their curative effects were observed after two year.

選取336例中老年人患有不可復(fù)性牙髓炎国内精品99久免费视频、牙髓壞死黄色网视频免费观看、牙髓鈣化、牙內(nèi)吸收和急黄网站毛片、慢性根尖周炎的患牙358顆日本公妇中字在线观看，隨機分為對照組和實驗組，對對照組行常規(guī)根管治療毛片福利导航免费，對實驗組則根據(jù)每個牙齒各根管的不同情況欧美老妇尻屄，采用根管-塑化聯(lián)合治療，觀察2年進(jìn)行臨床評價女人啪啪视频。

The CNTs prepared by temperature programming CVD method were characterized with diameters of 8~12 nm, surface purity, good graphitic and a high yield.

程序升溫CVD法制得的納米碳管管徑在8-12nm之間欧美涩涩视频、管壁潔凈、石墨化程度好免费的黄色网站能看A片，納米碳管的產(chǎn)量很高唐人呦一呦二在线播放。

Methods One hundred and fifteen extracted maxillary first premolars were included in this study. Radiograph of teeth in mesiodistal direction was taken.

收集115顆離體的上頜第一前磨牙，拍近遠(yuǎn)中向的X線片三级黄,色，用Photoshop5.0軟件分析根管久久惹99精品，用Weine氏法測量根管的彎曲度，測量的角度大于 18°時色e网，則認(rèn)為根管存在明顯的彎曲国产乱子露脸久久，根管的構(gòu)型采用Vertucci分類法。

Keywords: pyrology, vortex tube, experimental investigation, rectifier,energy separation performance

對整流器及其葉片角度對渦流管能量分離性能的影響日本jizzjizz，整流器對渦流管的長徑比的影響進(jìn)行了實驗研究无码操人视频，并將自行設(shè)計加工的帶有上述整流器的渦流管與artx公司生產(chǎn)的同類型渦流管進(jìn)行了對比實驗。

Especially, the difference of the nearest-neighbor hopping integral is due to the effect of the curvature of the carbon nanotubes. So, in fact there is a very narrow energy gap near the Fermi energy of unsquashed metallic zigzag carbon nanotubes, and, a slighter deformation is required to open a considerable energy gap in metallic zigzag carbon nanotubes than that in armchair nanotubes.

特別是91久久婷婷人人澡人人澡，最近鄰格點之間的躍遷積分的變化與碳納米管的曲率緊密相關(guān)黑人欧美视频巨粗巨大巨硬，因此實際上，理想金屬型 zigzag 碳納米管本身具有微小能隙777性视频，而施加比 armchair 碳納米管小的多的壓縮量黄色网站免费提供免费服务，就可以使金屬型 zigzag 碳納米管在費米能處打開相當(dāng)?shù)哪芟丁?/p>