好心人帮忙翻译下，毕业论文中的摘要，尽可能自己翻译，不要用翻译器来翻，先谢谢了

请大家帮忙翻译一下这段摘要，我的毕业论文。请不要用翻译软件，谢谢大家了！~老师说重新翻译~

Abstract
Signal simulator and integrated circuits in microelectronics under the constant development of technology arising out of an incentive to source equipment that can meet the needs of a variety of signals has been widely applied to satellite communications, aerospace, instrumentation and other areas. This paper designed to simulate a rotating machine shaft vibration signal simulator.
The article first outlines the development process of frequency synthesis, frequency synthesis of traditional technology, phase-locked loop frequency synthesis and direct digital frequency synthesis for comparison. Then, in theory, the digital frequency synthesis of the basic structure and working principle. Selected according to the design requirements of the major components, the system according to the characteristics of direct frequency synthesis and SCM technology design of rotating machinery vibration signal simulator. The design is done using SCM STC89S52 superposition of high harmonics of the fundamental signal and the signal generated. Circuit control hardware FIFO-type memory timing output vibration signal waveform. At the same time using the classical ping-pong type of storage and direct memory access (DMA) control methods, namely, hardware-timed control circuit Dual Dual FIFO-type memory to meet the harmonic requirements of continuous output signal simulator.
In the design, the system according to the functions of vibration signal simulator is divided into several different functional modules: SCM modules, memory modules, interactive modules, low-pass filter module. In this paper, the hardware design of each module are described in detail.
Finally, the paper on the harmonic signal simulator system noise analysis, amplitude quantization error, digital to analog conversion errors and other problems on a detailed analysis, and gives two common methods suppress harmonic signal simulator.

Key words direct digital frequency synthesis; SCM; signal simulator; shaft vibration signal

你自己用谷歌翻译一下，然后调整一下不准确的单词顺序也可以完成了。

http://www.google.com


2011年6月7日

Fresh cut vegetables and called half processing vegetables (ever) or mild vegetables-how vegetables (Minimally processed vegetables processing), is through to the Fresh vegetables were classified, sorting, cleaning, slit, preservation and so on packing, handling, keep Fresh of the state of the products.

This paper studies the following three contents: 1) the research in normal temperature (25 oC or so) and refrigerated (4 oC) storage conditions of fresh cut vegetables () some of their colonies with storage to decay time total the relationship between the changes. 2) fresh cut vegetables get research of microbial analysis identification. 3) research in different time of ultraviolet irradiation can influence whether fresh cut vegetables in the microbial growth. Conclusions are as follows: 1) in the first part of the experiment, the fresh cut vegetables in the microbial colonies with total storage time increased. 2) in the second part of the experiment, the fresh cut vegetables (wax gourd, tomatoes, pumpkin) from the fungi classics appraisal are yeast; Fresh cut tomatoes and pumpkin from the mould are penicillium. 3) in the third part of the experiments, along with the increase of ultraviolet irradiation time can inhibit microbial growth; Ultraviolet radiation on fresh pumpkin cutting of penicillium no significant inhibitory effect.

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