Self-made tungsten trioxide (WO_3) by calcining ammonium paratungstate was selected as the raw material to produce ultrafme and homogenous tungsten powder by oxidation-reduction method.

通過研究亚洲第一区色色色，得到如下結(jié)論：(1)本研究選取的三氧化鎢原料插抽视频，通過氧化—還原法(4次氧化5次還原)是可以制備出超細鎢粉的欧美性爱最黄第一视频区；所得金屬鎢粉的平均粒度約為0.38μm一级AAA毛片无码视频。

The results showed that 7-day-precultured embryogenic calli had the best responses for bombardment among 2-7 day' preculture duration. Enhanced transformation efficiency was found in the explants treated with high osmotic medium 4h prior to till 24 h after bombardment. Particles of gold and tungsten were both found suitable for rice transformation and there was no adverse effect when tungsten particles were reduced to 1/3 standard amount for DNA precipitation on transient GUS gene expression. However, it was found that gold particle had higher GUS expression at 120 h post-bombardment. A preliminary microprojectile transformation system with an average of 15-20 blue spots/explant GUS expression was routinely obtained for 'Tainung 67' by using the particle gun with 1,100 psi rupture disk, 6 or 9 cm microcarrier flight distance and 4 mm of macrocarrier flight distance setting.

初步結(jié)果顯示，以預培養(yǎng)2~7日之胚性癒合組織逐日測試轉(zhuǎn)殖率AV免费网站A片，以預培養(yǎng)7日之培植體表現(xiàn)最佳欧美性爱大屁股；培植體於轉(zhuǎn)殖前4小時至轉(zhuǎn)殖后24小時以高滲透壓培養(yǎng)基處理，有助於轉(zhuǎn)殖效率之提高国内精品1024地址一地址二；比較金欧美日韩精品综合、鎢粒子對轉(zhuǎn)殖率在轉(zhuǎn)殖后48h並無不同欧美国产美女性爱在线，但轉(zhuǎn)殖后120 h取樣，則金粒子組有較高之藍點數(shù)久久久久国产一级毛片高清版；鎢粒子用量可減少至1/3標準用量對轉(zhuǎn)殖率並無影響直接观看的黄色网页；利用基因鎗在使用1， 100 psi裂碟片AAA黄色视频免费看、大載片至擋片之距離為4 mm国产乱子伦视频大全、微載髁至射擊目標之飛行距離6或9 cm之設定，GUS基因表現(xiàn)之平均藍點數(shù)均可達15~20個／培植體女人的逼逼视频。

For AC current, the electrode is either pure tungsten or tungsten with a small amount (up to 0.5%) of zirconia to aid arc reignition and to reduce electrode erosion.

交流電流特大巨黑吊性XXXX黑人巨大，電極要么是純鎢，或是鎢極中含有少量鋯(達0.5%)免费久久一级欧美大黄，有助于電弧重新引燃并減少電極侵蝕日韩欧美综合在线不卡。

The mechanical properties of torqued and non-torqued tungsten alloy are also investigated. A constitutive model that describes rate-hardening and strain-hardening effects is also established for these tungsten alloys.

同時對預扭轉(zhuǎn)和未扭轉(zhuǎn)鎢合金材料進行了動態(tài)力學性能實驗研究，建立了考慮應變率硬化99riav67、應變硬化效應的動態(tài)本構(gòu)模型亚州人精品午夜。

The results show that the coverage area of tungsten film on diamond surface is above 90% and the steady tungstenic carbides WC and W2C are created by this technology. The tungsten film coated on diamond is realized.

結(jié)果表明，該方法可在金剛石表面鍍覆上一層覆蓋面達到90%以上的金屬鎢膜一级婬片A片AAA毛片，且生成穩(wěn)定的碳化物WC和W2C久久r久久，得到由難熔金屬鎢包覆的金剛石。

Properties of fine tungsten powder and fine tungsten carbide powder from violet tungstic oxide are studied.The result shows that the process of violet tungstic oxide preparation is advanced and reasonab...

結(jié)果表明国产AV。，紫鎢制取工藝先進合理影音先锋每日最新AV资源久久，由紫鎢制得的鎢粉、碳化鎢粉細而均勻精品久久亚洲一区二区欧美，分散性好www.自拍偷拍.com，是制取高性能硬質(zhì)合金的優(yōu)質(zhì)原料。

Composite electrodeposits of nickel-cobalt-tungsten carbide were prepared by adding tungsten carbide particles in the nickel-cobalt alloy solution.

研究了在鎳鈷合金鍍液中加入碳化鎢微粒形成鎳－鈷－碳化鎢復合鍍層的共沉積過程jiujiuse在线。

The effect of suspended tungsten carbide particles, bath temperature and cathodic current densities on the content of tungsten carbide in the electrodeposits was studied, the preferred plating parameters were also optimized by orthogonal test.

分析了鍍液中碳化鎢微粒的懸浮量日韩精品15P、鍍液溫度及陰極電流密度對鍍層中碳化鎢含量的影響，并進一步通過正交試驗優(yōu)選出一種較佳的操作條件亚洲无码操B视频。

The weight loss rate in 600 ℃ sodium containing 30 μg/g oxygen is about 1×10~(-4) mm·a~(-1) and 2×10~(-4 mm·a~(-1), respectively for the rotary swaging tungsten and polishing tungsten.

在600℃久久精品国产96久久久、含30μg/g氧的金屬鈉中，旋鍛鎢和拋光鎢的失重速率分別為1×10-4mm·a-1和2×10-4mm·a-1免费毛片入口，兩種鎢與鈉均有良好的相容性一级黄色网一级黄色网站。

It was shown by further research that the formed tungsten oxide had an obvious layer-like structure, where from outer to inner layer the valence of tungsten increased and the reduction degree decreased. The carbonization of W depended on the replacement of W atom at the center of the body-centered cubic by C atom and the minor adjustment of C atom position and the lattice parameters.

深入研究表明，氧化鎢碳還原顆粒具有明顯的層狀結(jié)構(gòu)久操国内精品，自外到內(nèi)鎢的化合價遞增91超薄丝袜脚交，還原程度降低；鎢的碳化是碳原子替換體心立方鎢晶胞的中心鎢原子，然后碳原子轉(zhuǎn)換到鎢原子點陣間隙再經(jīng)晶胞常數(shù)微調(diào)而形成国产精品视频三区。