tube shield 中文意思是什麼
tube shield
解釋
x射線管屏-
Tube shield x
射線管套 -
At the initial stage of planar technique, b was employed as ideal diffusion impurity in base - region of npn si planar devices because of the match of its solid - solubility and diffusion coefficient in si with those of p in emission - region, and the good shield effect of sio2 film to b. but because of the relatively large solubility ( 5 1020 / cm3 at 1000 ) and the small diffusion coefficient, the linear slowly - changed distribution of acceptor b in pn junction can not be formed, which could not cater to the requirement of high - reversal - voltage devics. thereafter b - a1 paste - layer diffusion technology and close - tube ga - diffusion technology had been developed, while the former can lead to relatively large the base - region deviation and abruptly varied region in si, which caused severe decentralization of current amplification parameter, bad thermal stability and high tr ; the latter needed the relatively difficult pack technique, with poor repeatability, high rejection ratio, and poor diffusion quality and productio n efficiency
在平面工藝初期，由於b在硅中的固溶度、擴散系數與n型發射區的磷相匹配， sio _ 2對其又有良好的掩蔽作用，早被選為npn硅平面器件的理想基區擴散源，但b在硅中的固溶度大（ 1000時達到5 10 ~ （ 20 ） ，擴散系數小， b在硅中的雜質分佈不易形成pn結中雜質的線性緩變分佈，導致器件不能滿足高反壓的要求，隨之又出現了硼鋁塗層擴散工藝和閉管擴鎵工藝，前者會引起較大的基區偏差，雜質在硅內存在突變區域，導致放大系數分散嚴重，下降時間t _ f值較高，熱穩定性差；後者需要難度較大的真空封管技術，工藝重復性差，報廢率高，在擴散質量、生產效率諸方面均不能令人滿意。 -
3. the bamboo carbon tube inside absorb water the fiber, it can absorb the water of the flower pot bottom to the upper level mud, to provide the plant growth need. 4. the bamboo in the flower pot carbon has the fluid matter, air of decontamination and protects fresh eliminate smelly, adsorb the moisture, improve the soil and shield the electromagnetic wave etc. effect
4 .種植籃內填充竹炭顆粒，竹炭具有自動調濕功能，含有植物生長所需的各種礦物質，還可凈化水質空氣保鮮消臭屏蔽電磁波輻射等功效，用竹炭顆粒水培花卉其實際效果較好。 -
Tube piece assembly system of earth pressure balance shield machine and its troubleshooting
土壓平衡式盾構機管片拼裝系統故障排除 -
Study on precast technique for concrete segmental tube applied to double circle shield construction
雙圓盾構混凝土襯砌管片預制技術的研究和應用 -
Through simulating model tests of shield tunnel passing through the yellew river in the diversion project from south to north china, a systematic analysis on the primary factors affecting joint stiffness, including arrangement of joint bolt, thickness of annular packing of bolt, behavior and thickness of cushion material between two tube plates, magnitude of prestressing force of joint bolt and different stressed states at tube plate joint etc., are performed. the study results may provide reference for tube plate design of shield tunnel
通過南水北調穿黃盾構隧道模擬模型試驗，對影響接頭剛度的主要因素即連接螺栓的布置、螺栓墊圈的厚度、管片與管片之間墊層材料的性能和厚度、連接螺栓的預緊力的大小及管片接頭不同的受力狀態進行了系統的分析，為盾構隧道管片設計提供了參考。 -
Abstract : through simulating model tests of shield tunnel passing through the yellew river in the diversion project from south to north china, a systematic analysis on the primary factors affecting joint stiffness, including arrangement of joint bolt, thickness of annular packing of bolt, behavior and thickness of cushion material between two tube plates, magnitude of prestressing force of joint bolt and different stressed states at tube plate joint etc., are performed. the study results may provide reference for tube plate design of shield tunnel
文摘:通過南水北調穿黃盾構隧道模擬模型試驗，對影響接頭剛度的主要因素即連接螺栓的布置、螺栓墊圈的厚度、管片與管片之間墊層材料的性能和厚度、連接螺栓的預緊力的大小及管片接頭不同的受力狀態進行了系統的分析，為盾構隧道管片設計提供了參考。 -
Cannon tube shield
筒形屏蔽罩 -
X - ray tube shield, x
射線管防護罩
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