片孔距 的英文怎麼說
中文拼音 [piānkǒngjù]
片孔距
英文
perforation pitch-
The basic concept of siw is that it use the top and bottom layers of metal together with two row of vias is very small compared with wavelength, the dissipation loss of radiation is very small. it acts like a rectangular waveguide filled with some dielectrics, so components which can be composed by rectangular waveguide can also composed by siw such as antenna, filter, power divider, coupler, resonator
基片集成波導的基本概念是利用基片的上下金屬板和兩排間隔一定距離的金屬孔構成波導的金屬壁，由於每排金屬孔孔間距遠小於波長，因此由縫隙泄漏的能量很小，這相當于內部填充了介質的矩形波導，所以能夠用矩形普通波導實現的結構也都可以用基片集成波導來實現，比如功分器、濾波器、天線、耦合器、振蕩器等。Compared with the 5. 8s complete sequence of the snail arion rufus, its1 and its2 regions were recognized and combined for analysis. from sequence observation, it showed that the zhejiang sample has more inserted sites and fragments while the sequences of other three are nearly all the same. the average g % + c % of the four individuals was 46. 8 % while the zhejiang sample ' s was 48. 3 % and the other three ' s were all about 46. 2 % ; ts / tv and genetic distance mainly lies between the zhejiang sample and the other three individuals, which were 0. 8 and 0. 07 respectively
用於比較的序列長約350bp ，觀測一級結構，加拿大、墨西哥灣扇貝和美國二代個體的its1和its2序列幾乎完全相同，而浙江個體則具有較多的插入位點與片段； 4個個體平均g + c含量46 . 8 % ，其中浙江個體為48 . 3 % ，其它3個個體均為46 . 2 %左右；轉換顛換比與遺傳距離主要存在於浙江個體與其它3個個體之間，分別為0 . 8和0 . 07左右；以櫛孔扇貝作外群構建的分子系統樹表明：浙江群體已產生了一定的分化。In the experiment, we use the he - ne laser and the semiconductor laser as the source, record the bessel beam patterns behind the axicon by using a digital camera and a microscope, measure the radius of the bessel beam central spot by film - scanning and measure the effect of both the radius of the aperture and the open angle of the axicon on the maximum non - diffraction distance. the experiments show that a specific propagating range has constant power and the beam has a bessel - like distribution in this range. the results agree with the beam corresponding to a diffraction free beam
同時我們還採用膠片掃描的方法測量了無衍射光束的中心光斑尺寸，測量了不同光闌孔徑和不同稜角情況下的最大無衍射距離和傳播軸附近橫截面內微小光孔中的光強，實驗結果顯示當激光光束經過軸棱錐轉換後有一段距離功率變化很小，且分佈近似貝塞爾分佈，符合無衍射光束的特性;經過聚焦后，呈現三維分佈中空的光束bottlebeam ，實驗結果與理論分析基本吻合。Extraction of large - fragment genomic dna in order to gain dna template of pcr amplification ( long pcr amplification and salvage pcr amplification ) which was high purity and large fragment, three methods were used to extract genomic dna of bacillus subtilis, i. e. low melting - point agarose embedding method, sds - proteinase k - phenol chloroform extraction method and bacterial genomic dna extraction kit method. the genomic dna of bacillus subtilis were gained by these methods, and the operated programs of the methods were improved. the results showed that the genomic dna extracted by low melting - point agarose embedding method were obviously biggest than that of another two methods
大片段基因組dna的提取為了獲得用於pcr擴增（長距離pcr擴增和分段pcr擴增）的高純度、大片段（至少為pcr產物長度的4倍）的dna模板，應用三種方法：低熔點瓊脂糖包埋法， sds -蛋白酶k -酚氯仿抽提法和細菌基因組dna提取試劑盒法，分別提取獲得了枯草桿菌基因組dna ，並對3種方法的操作程序進行了不同程度的改進，結果表明：低熔點瓊脂糖包埋法提取的基因組dna片段明顯大於后兩種方法，採用0 . 5瓊脂糖凝膠電泳3h ，仍然跑不出加樣孔。Effects of different fuel - air ratios and different geometric parameters of dual - stage swirler ( such as inner diameters of the primary swirl and secondary swirl passages, outer diameters of the secondary swirl passages, vane angle of the primary and secondary swirler, the distance of the flare exit from throat etc ) on combustion performances are studied experimentally. the experimental results show that radial profiles of the outlet gas temperature 、 combustion efficiency 、 emissions of co2 、 co and nox and lean blowout are affected with different degrees by the different geometric parameters of dual - stage swirler and the arrangement of primary holes
在不同油氣比下，不同的雙級旋流器幾何參數（例如:一級與二級旋流器出口內徑d 、葉片安裝角、二級旋流器出口外徑d 、二級旋流器的喉道到出口截面的距離l和喉道前後的圓弧半徑r以及主燃孔孔布局等）對單頭部環形燃燒室的出口溫度分佈、燃燒效率、貧油熄火油氣比以及污染物（ co _ 2 、 co和nox ）排放等燃燒性能的影響規律進行了研究。分享友人