圆基

When the powder loading was fixed as 58%,the molded compact of a gearwheel whose addendum circle diameter is 700 μm was obtained with well shape retention.

3μm的羰基铁粉和石蜡基热塑性粘结剂体系，当粉末的装载量为58%时，获得了形状良好的齿顶圆直径为700μm的微型齿轮注射生坯。

The 20S catalytic core of the 26S proteasome has the shape of a barrel made of four rings which are composed of seven differentαsubunitsα_1-α_7 at two outer rings and seven differentβsubunitsβ_1-β_7 at two inner rings at which the catalytic sites locate. Three of theβsubunits contain proteolyses sites, which are sequestered in the hollow interior of the 20S particle. Substrates enter the 20S through a narrow channel formed by theβsubunits, whose N-termini, depending on their conformation, can either obstruct or allow substrate entry and thus function as a gate. This entry channel is narrow and only permits passage of unfolded, linearized polypeptides.

哺乳动物26S蛋白酶体是由一个20S催化颗粒(catalytic particle，CP)和两个19S调节颗粒(regulatory particle，RP)组成的ATP(adenosine-triphosphate，ATP)依赖性蛋白水解酶复合体。20S CP是26S蛋白酶体的催化核心，它是由4个圆环堆叠形成的桶状复合物，其中两侧外环每个环是由α_1-α_7亚基组成，两个内环每个环是由β_1-β_7亚基组成，4个环的中央形成一个狭窄的内腔。2个β内环形成了20S CP的催化中心空腔，其内壁为催化活性位点所在地；外侧α环中心的孔道是底物到达催化中心空腔的通道，一般被α亚基上的N末端所封闭，阻止胞内非目的靶蛋白进入20S CP内被降解破坏。

Leaves ovate to ovate-lanceolate, base rounded to cuneate-attenuate, margin crenate or serrate except at base.

叶卵形到卵状披针形，渐狭的基部圆形到楔形，边缘具圆齿或有锯齿除在基部之外。

In this study, copper alloy adding Ti-Zr and Al-Zr was the target and made the cupper alloy ingots by vacuum arc remelter. After rolling and heat treatment, the two-inch round target was cut by wire electrical discharge machining. DC sputtering deposited cupper alloy thin films on silicon base materials and optical glasses to discuss the thin film microstructures、compositions、practical performances and optical characteristics.

中文摘要本研究以自行设计之铜基合金靶材，在铜基材料中添加钛锆与铝锆等微量金属，以真空电弧熔炼制作铜合金方锭，经滚压加工及热处理后，以线切割机切成两吋之圆型靶材，再进行直流溅镀沉积铜合金薄膜於矽基板和光学玻璃基板上，探讨不同成分比例下之薄膜显微结构、成分组织、实用性能与光学特性。

In further studies, we will use the biophysical techniques, such as Circular Dichroism, to investigate the structural and functional roles of these 6 mutants.

未来我们将利用双圆旋光谱仪等技术，进一步研究这些胺基酸残基在Ku与DNA结合的角色。

Basic circle is the circle which form s involute.

基圆是形成渐开线的一个定圆。

The results are much better than the other approaches'. Then we give another method for approximating offset curves. The circle is first approximated by regular polygon within some tolerance. The exact offset curve is then approximated by the convolution of the regular polygon with a B-spline curve or a NURBS curve having the same degree.

与此同时作者从基圆的正多边形逼近出发，通过求解包络的技巧给出了等距曲线逼近的另一个算法，可整体估计误差，所得的等距逼近曲线为与基曲线同次数的B样条或NURBS曲线，克服了国际上现有同类算法中逼近曲线次数几倍于基曲线次数的缺陷。

Basal petioles 1.5–5 cm, sheaths long, broad; blade oblong, 2–4 × 1–2 cm, pinnate; pinnae sessile,(3–) 4–6 pairs, remote; ultimate segments long-ovate to suborbicular, 5–10 × 3–8 mm, base subtruncate or rounded, entire or apex shallowly 1–3-toothed, sometimes 3–4-crenate; terminal pinnae obovate or orbicular, base cuneate, apex more deeply 3-lobed.

基部的叶柄1.5-5厘米，鞘长，宽；叶片长圆形， 2-4 * 1-2 厘米，羽状；羽片无柄，(3-)4-6 对，遥远；末回裂片长卵形到近圆形， 5-10 * 3-8 毫米，基部近截形或圆形，有时，浅全缘或先端1-3齿状具圆齿；更深的顶生的羽片倒卵形的或圆形，基部楔形，先端3浅裂。

Carbide products company's main products: bar, long thin, box, welding blade, turning blades, rotating file of rough, spiral blade, bamboo cutter blade, the saw blade cutter rough, porous stretch mode, Blank-cold heading, roll, possession, Central, the ball, special-shaped nozzle and various parts overall carbide tools: Jingmoyuanbang, the overall carbide bit, end mills, the key slot cutter, R cutter, ball - Cutter, Reamer, small aperture boring knife blade cutter, welding-type spiral end mill and Gezhongfeibiao tool of high-density tungsten alloy products: Jingmoyuanbang, oscillator, the Pendulum, with weights, fly Benchmarking, and so on.

公司主要产品硬质合金制品：棒料、长条薄片、方块、焊接刀片、可转位刀片、旋转锉毛坯、螺旋刀片、竹木刀具刀片、锯片铣刀毛坯、微孔拉伸模、冷镦模坯、轧辊、管、环、球、喷嘴及各种异型零件整体硬质合金工具：精磨圆棒、整体硬质合金钻头、立铣刀、键槽铣刀、R铣刀、球头铣刀、铰刀、小孔径镗刀、锯片铣刀、焊接式螺旋立铣刀及各种非标刀具钨基高密度合金制品：精磨圆棒、振子、摆锤、配重块、飞标杆等。

An important method to improve the sawing effectiveness is to optimize the base and sawtooth structure s of diamond saw blades.

金刚石圆锯片是金刚石类工具中消耗量最大的刀具，优化金刚石圆锯片基体及锯齿结构是改善锯切效果的重要途径。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。