The properties and particle fining mechanism of the doping powders, microstructure and the distribution of Scandia and surface behavior of the matrix have been investigated compared with that of with mechanical mixing scandia and tung.

利用掃描電鏡、能譜分析儀和原位俄歇電子譜儀等現(xiàn)代分析技術(shù)研究了摻雜鎢粉的特性亚洲黄色视频肏屄、氧化鈧-鎢基體的結(jié)構(gòu)特征亚洲岛国性爱视频、稀土元素在基體內(nèi)的分布、表面特性亚洲黄情。

The stealth warplane for the microwave radar usually have complicated structures with the coating of wave absorption. On the base of calculation and modeling of the geometrical structure of the warplane in real size, the HF RCS of the air crafts under two different polarizations in different direction have been calculated with the FDTD. The result shows that the above mentioned stealth warplane have the obvious characterstics of frequency resonance, polarization and the relatively large RCS in HF Band 10-30dBm2, which can be used as the theoretical reference for selection of working frequency for sky wave OTH Radar and it also means that the sky wave OTH radar has good capability of anti-stealth targets quantitatively.

對微波雷達具有隱身作用的飛機久久r性，其形體較為復(fù)雜且表面涂敷有強吸波材料在對一種具有隱身幾何外形結(jié)構(gòu)實際尺寸飛機進行計算建模的基礎(chǔ)上，文中采用FDTD技術(shù)得到了兩種極化狀態(tài)下該飛機無涂敷時不同方向上的短波雷達截面RCS值其結(jié)果顯示了這種隱身幾何外形飛機在短波波段有明顯的頻率諧振特性超碰在线永久、極化特性和較大的RCS10-30dBm2亚洲电影色色黄片，可為天波超視距雷達在選擇工作頻率時提供理論參考，并定量地說明天波超視距雷達具有較優(yōu)的反隱身目標能力

The microwave absorbing performance of frequency selective surface with resistance patch was analyzed in this paper.

1引言頻率選擇表面是二維周期性導(dǎo)體貼片或孔徑單元陣列久久久好视频，具有帶阻或帶通的濾波特性求a片网址，其頻率濾波特性來自它的周期性結(jié)構(gòu)與電磁波的相互作用。

In this paper, nanopowders of rare earth oxides and tungsten were prepared and 0-3 type nano-composit rare earth tungsten thermionic emission materials were fabricated with novel technics. The raw material selection, preparation technic parameter, structure, physical and chemical characteristic, the rare earth distribution and the emission behavior were studied. The influence between the active layer and the thermionic emission performance, rare earth elements diffusion and distribution along depth were investigated in detail. The surplus RE formation and the electron transfer were discussed in theoretically. The thermionic emission current density of the single surplus RE on the active layer was educed. We adopted "liquid-liquid mixing, freeze-drying and two stage-reduction" working step firstly to produce the RE-W nanopowders including La-W powder, Ce-W powder and Y-W powder.

本文采用細化顯微組織的新工藝欧美人人做人人爱视频，制備了納米稀土鎢粉末和0-3型納米復(fù)合稀土鎢熱電子發(fā)射材料色呦呦网站直接看的，探討研究其原料選擇、制備工藝及參數(shù)www.无码在线、結(jié)構(gòu)特征美女的隐私秘免费视频网、物理和化學(xué)特性、稀土分布均勻性国产产一区二区三区久久毛片最强、以及熱電子發(fā)射特性国产成人综合亚洲；系統(tǒng)研究了稀土元素的高溫擴散情況、高溫狀態(tài)下活性層中稀土的縱向深度分布人人操人人草人人草人人叉人、以及表面活性物質(zhì)和活性層厚度對熱發(fā)射性能的作用caoporon；從理論上分析闡釋了超額稀土的形成及其電子的傳遞過程；并從理論上推導(dǎo)了活性層中單個超額稀土的熱電子發(fā)射電流密度黄色视频一区二区三区免费在线观看。

The characterization of modified surfaces were explored by contact angle measuring meter and atomic force microscopy,the tribological properties of samples in nanometer and millinewton scale were measured by friction force microscopy and CETR UMT-2 tribometer. The effects of ultraviolet radiation,sliding velocity and load on tribological properties of samples were analyzed.

在鋁日韩免费午夜毛片视频、鈦金屬薄膜和鋁、鎂在线国产福利网址、鈦及鈦合金上制備自組裝分子膜欧洲vodafonewifi18√k，使用接觸角測量儀、原子力顯微鏡對改性的表面進行表征成人免费视频网站，使用摩擦力顯微鏡和微摩擦磨損試驗機對試樣在納米尺度和毫牛尺度下的摩擦學(xué)特性進行測試，分析了紫外照射、滑動速度亚洲91呦呦视频、載荷對試樣的摩擦學(xué)特性的影響久草观看视频。

The corrosion fatigue crack growth and near-threshold characteristcsof high tensile steel HT60 were investigated by using the compact specimens underexposure to synthetic sea water. The da/dN vs △K_ relation in air may be conser-vetivel estimated for that in sea water. In the high △K region with high stressratio, owing to the acceleration of crack growth promoted by stress-induced dissol-ution, the crack opening stress intensity factor K_ represents only the result ofcrack surface in contact with corrosion products, so as to give an overestimation ofK_ at crack tip.

對高拉力鋼HT60的腐蝕疲勞裂紋擴展特性和門檻值區(qū)域特性，采用緊湊拉伸試件在人工海水中進行了實驗和研究最新白嫩丰满美女AV网站，結(jié)果表明：在空氣中的da/dN與ΔK_關(guān)系可以作為在海水中的da/dN與ΔK關(guān)系的一個偏保守的預(yù)測久久久久久黃色網站免費；在高應(yīng)力比的高ΔK區(qū)域，由于應(yīng)力誘起溶解促進了裂紋擴展的加速一级欧美黑人大战白妞；該裂紋開口應(yīng)力強度因子K_僅反映了裂紋表面同腐蝕生成物接觸的結(jié)果18岁免费看的黄色网站，從而導(dǎo)致了K_在裂紋尖端的偏大的估計結(jié)果。

This paper made a systematic research on Lonicerafulvotomentosa Hsu et S.C. Cheng, which grows well inkarst areas, from its biological characteristics, such asmorphology, growth and physiology. The main conclusions asfollows:(1)From the viewpoint of morphological anatomy, it hastypical xerophyte structures such as well-developed epidermisand tissues that transport water effectively, small leaf area,dense floss under the leaf surface, high stoma density, thesmall opening degree, thick cuticle, well-developed xylem andpalisade tissues, etc. The pollen of L. fulvotomentosa isseems to be spherical, and has 3 grooves, much bulge on theepidermis evenly. The shape of pollen is an important featureon taxonomy. The ripe fruit has from 1 to 18 seeds, some fruitbranch has 135 berry, its diameter is up to 0.8 centimeter.(2)From the viewpoint of growth, L.

本文從形態(tài)解剖色秀视频a8a6com、生長發(fā)育的節(jié)律国产精品老女人精品视频、光合生理特性以及種子萌發(fā)生理等生物學(xué)特性方面對喀斯特適生經(jīng)濟植物黃褐毛忍冬進行了較為系統(tǒng)的研究，得出以下結(jié)論：(1)在形態(tài)解剖上黄片A片三级aa黄，黃褐毛忍冬根莖中含有發(fā)育良好的周皮和輸導(dǎo)組織免看一级a一片日韩A片，導(dǎo)管密度大，橫截面寬a级黄片一级，周皮的形成具有節(jié)制蒸騰日韩黄色视频品爱、通氣作用和保護組織免受外界環(huán)境影響的作用，寬的導(dǎo)管對水分的輸導(dǎo)效率高99热W亚洲精品国产99；葉片密被絨毛18禁片免费网站在线看，面積較小，氣孔密度大男人的天堂av社区在线、開度小三级绝黄A片在免费线观看欧美，厚的角質(zhì)層和發(fā)育良好的木質(zhì)部和柵欄組織等是典型的旱生結(jié)構(gòu)；黃褐毛忍冬花粉近球形大学生一级A片，具3 孔溝最美情侣高清免费观看，表面具均勻分布的小刺，刺間具網(wǎng)狀紋理亚洲欧美综合久久久久久小说。

In numerical stimulation, flow field, flow velocity distribution and total pressure distribution on vegetation surface were studied around vegetation of three different statuses, i.e. vertical, acclivitous and lying.

通過數(shù)值模擬計算自拍偷拍小说区，研究了直立、傾斜和臥倒三種不同狀態(tài)下植被周圍的流場特性日本一区,二区,三区AⅤ视频、流速分布特性以及植被表面總壓強分布99热精品区。

When weig ht percentage of TiO 2 sol was10%-20%,the coating showed a good hydrophilicity after UV irr adiation for30～60min or sunlight irradiation for2～5hours. The hydrophil ic angle lowered to about 4degree and the surface of coated layer had the featu re of self-cleaning.

在TiO2溶膠質(zhì)量分數(shù)為10%～20%時，該液體在基板上形成的涂層具有很好的超親水特性狼友视频在线的，在UV光照射30～60min或陽光照射2～5h后女人扒开腿让男人桶白浆动态视频，親水角可低至4°左右，涂層表面呈現(xiàn)自潔特性男人网站在线观看网站不卡。

Effect of different surfactants on the UV intensity of Al(superscript 3+)-MXFX have been studied. Is Cetyl Trimethy-lammonium Bromide can increase the UV intensity of Al(superscript 3+)-MXFX is discovered. Based on this reaction, the reaction conditions in detail and proposed a simple, rapid and sensitive new method for the determination of MXFX by UV method is inve stigated. This method has been applied for the determination of MXFX in tablet with satisfactory results.

通過研究不同表面活性劑對Al(上標 3+)-莫西沙星體系紫外特性的影響天天摸天天，發(fā)現(xiàn)十六烷基三甲基溴化銨對該體系有顯著的增敏作用免费观看黄网站不卡影院视频；系統(tǒng)研究了CTMAB-Al(上標 3+)-MXFX反應(yīng)體系的紫外特性，利用這一反應(yīng)體系国产激情无码aⅴ视频，建立了簡單香港性爱视频一区二区三区、快速、靈敏的測定莫西沙星的紫外分光光度法XxXxVIDeos绝顶高潮，選擇了最佳實驗條件99精品视频精品精品视频，并將此方法用于莫西沙星片劑的測定，結(jié)果滿意精品黄色免费看的个。