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The formation mechanism of the absolute instability and gyrotron backward wave oscillations is analyzed, and the methods to suppress the parasitical modes are discussed.The nonlinear theory model of gyro-TWT is consummated by considering the influence of tapered magnetic field and waveguide radius, electron velocity spread, and waveguide loss on electron beam-wave interaction. The large-signal characteristic of gyro-TWT, such as launching loss and absolute instability, are also analyzed in detail. This work establishes the foundation for the development of a gyro-TWT amplifier.

重点研究了两段损耗波导结构和损耗陶瓷结构回旋行波管中的电子注-波互作用，分析了绝对不稳定性和回旋返波振荡的形成机制和抑制寄生模式的方法；完善了回旋行波管的非线性理论模型，并考虑了磁场和波导半径渐变、速度零散、波导损耗等因素对注-波互作用的影响；详细分析了发射损耗、相位稳定性等回旋行波管的大信号特征，为回旋行波管放大器的研制奠定了基础。

Therefore, the multi-stage interaction structures with losses and severed structure were more stability for absolute instability and gyrotron backward oscillations. This study presents a nonlinear analysis of typical oscillations, including absolute instability, gyrotron backward oscillation and reflective oscillation. The multi-stage gyro-TWT seem to increase effectively the start-oscillation currents of the absolute instability, gyro-BWO, and reflection oscillation.

所以在本研究分析中，藉由了解磁旋行波放大器中的自发振荡物理原因及特性，将有助於高功率放大器的设计，并且引用非线性程式进行磁旋行波放大器稳定分析，并且采用兼具隔离管及散布式损耗结构的磁旋行波放大器，同时提升绝对不稳定、磁旋返波振荡及反射振荡的稳定性能有效提升磁旋行波放大器输出功率和频宽。

If, for any cause whatsoever, there exists at the time in question no rate of exchange generally current in Los Angeles for effective cable transfers of the sort above provided for, we agree to pay you on demand an amount in United States Dollars equivalent to the actual cost of settlement of your obligation to the payor of the draft or acceptance or any holder thereof, as the case may be, and however and whenever such settlement may be made by you, including interest on the amount of dollars payable by us from the date of payment of such draft or acceptance to the date of our payment to you at the rate customarily charged hy you in like circumstances.

所规定的那种现行汇兑率，我们同意以美元，即期偿付等同于贵行实际履行对汇票或承兑汇票付款人或持有入的债务时支付的款额，不论贵行在何时或以何种方式履行，其中包括从贵行支付汇票之日起到我们依贵行在此种情况下的惯常收费率进行偿付之日为止，按我方应偿付美元数额计息的利息。

The issuing bank or paying bank or its designated location in the negotiating bank branch or agency after the draft for acceptance, leaving the documents, return the money order; the bill prior to maturity, the beneficiary or the negotiating bank may hold Acceptance returned to the local discount market discount, net of discounts to maturity of the interest income in cash immediately; such as local non-discounted market, banks may be required to acceptances discounted, nor can wait until the due date

开证行或其指定付款行或其在议付行所在地的分行或代理行承兑远期汇票后，留下单据，退还汇票；在汇票到期前，受益人或议付行可持退回的承兑汇票向当地贴现市场进行贴现，扣除贴现日至到期日的利息，立即收入现金；如当地无贴现市场，可向承兑银行要求贴现，也可等到汇票到期日再向承兑银行兑款。

Microspectrophotometer was used to measure the DNA content of 3 mucosa specimens of normal blad- der, 5 papillomas and 15 bladder transitional cell carcinomas. The transitional cell carcinoma was divided into 3 gradesand each grade group comprised 5 cases.

应用显微分光光度计检测膀耽正常粘膜、膀胱乳头状瘤及膀胱移行细胞癌共23倒(正常粘膜3例、乳头状瘤5例及移行细胞癌15例，移行细胞癌分三级，Ⅰ级、Ⅱ级、Ⅲ各5例)，其结果显示，正常粘膜上皮细胞和乳头状瘤细胞核及移行细胞癌细胞核Ⅰ、Ⅱ、Ⅲ各组之间胞核DNA含量均值有显著的差别(P.05～0.01)。

Methods 36 limbs of recurrent LEVI in 35 cases were enrolled in this study , superficial femoral vein、perforating vein incompetence were all applied with B ultrasound examination and intravenous antegrade angiography of deep vein of inferior member before operation ,8 limbs in 7 cases among them were only operated on superficial vein and the main great saphenous vein was remained ; 28 cases in which main great saphenous vein was drawn out were divided into 2 groups, in group B , operation on superficial vein and external valvuloplasty of superficial femoral vein valve were applied ; in group C ,operation on superficial vein and external valvuloplasty of superficial femoral vein valve combined with subfascial endoscopic perforator vein surgerywere applied.

35例36条肢体复发性LEVI，术前全部行股浅静脉、交通静脉B超及下肢深静脉顺行造影检查，其中7例8条肢体原大隐静脉主干未抽剥仅行浅静脉手术；28例大隐静脉主干已抽剥者随机分为B组和C组，各14例，B组行浅静脉手术+股浅静脉带戒术，C组行浅静脉手术+股浅静脉带戒术联合SEPS。

Indeed, another reasonable design choice for this recipe's class would be to completely forego the customizability of what lines are to be considered separators and just test for separator lines with line.isspace, so that stray blanks on an empty-looking line wouldn't misleadingly transform it into a nonseparator line.

实际上，另一个合理的设计选择是完全不顾这一层泛化，不用理会如何定义分隔行，而只用line.isspace测试本行是否为空行。这样可以处理显示为空行的行中包含零星的空白符号的情况，而不会将它作为非分隔行。

Basing on the setup of animal model of root avulsion of the brachial plexus, we divided the experimental animal into four groups by the operative method: Group A: one end of the maternal nerve graft was connected with the upper trunk of the healthy side by end-to-side neurorrhaphy, and the other end was sutured to the distal stump of musculocutaneous nerve infraclevicularly by end-to-end neurorrhaphy. Goup B: on the healthy side, the operation was the same, the other end was sutured to the distal end of C〓 by end-to-end neurorrhaphy on the affected side. Group C: the maternal nerve graft bridged the phrenic nerve and infraclevicular musculocutaneous nerve of the affected side by end-to-end neurorrhaphy. Group D: the phrenic nerve was sutured to the distal end of C〓 supraclevicularly by end-to-end neurorrhaphy.

在构建了模拟小儿臂丛神经根性撕脱伤的动物模型基础上，将实验动物按手术方式分组如下，A组：母鼠提供的的神经移植体一端与子鼠健侧臂丛上干行端侧吻合，另一端与患侧已切断的锁骨下肌皮神经远端行端端吻合。B组：母鼠提供的的神经移植体一端与子鼠健侧臂丛上干行端侧吻合，另一端与患侧已切断的锁骨上颈〓远端行端端吻合。C组：母鼠提供的的神经移植体桥接于子鼠患侧膈神经与锁骨下肌皮神经之间。D组：子鼠患侧膈神经直接与锁骨上颈〓远端行端端吻合。

By far the most popular serial interface between a computer and its CRT terminal is the asynchronous serial interface, and between a circuit switch and its telephone terminal, the synchronous one.

在计算机与其显示终端之间最为常见的串行接口是异步串行接口，异步串行接口，而在电路交换机与其电话终端之间最为常见的串行接口是同步串行接口。

Aformula which describes the transient process from beginning traveling waveto steadytraveling wave was deduced and the concept of initial traveling wave stagefirst was defined and its duration was given. It leads to a conclusion that reflectionfactor is a time dependent function, and variation range and reflection factor atdifferent stage were presented .Based on unified traveling wave theory andtransmission line model of reflective terminal with energy storage element , powerpolarity of initial traveling wave was analysed with both physical and mathematicalmethod.

通过理论推导得出从初始行波到稳态行波过渡过程的数学公式，统一了不同阶段的故障分量信号；定义了初始行波的概念，并指出了其持续时间的影响因素，针对末端含有储能元件系统，从物理和数学两方面剖析了初始行波的功率极性；通过分析提出反射系数是时变函数，给出了在不同暂态阶段行波反射系数的变化范围。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。