激光切割及其工艺问题的研究

近几年激光技术得到了快速发展,已经变成一种主流的切割技术.激光切割发展迅速,应用日益广泛,是一种先进加工方法,本文对激光切割做了简要介绍以及探讨了在激光切割技术应用中常见的几种工艺问题的研究.     

平面立体三面切割时截交线的画法

三面切割是两面切割的延伸,本文重点介绍三面切割截交线的投影规律以及与两面切割截交线之间的关系,给出作三面切割截交线时的正确方法和求解这一类问题的一种思路。     

关于切割类固体压强问题的解析

固体压强分析计算问题较为常见,融合了切割前后对比的固体压强问题更为灵活,需要综合压强公式、体积公式、压力公式来分析推理.常见的切割类型有三种,包括竖直切割、固体水平切割、倾斜切割.     

聚能切割在钢结构建筑拆除中的应用研究

传统的建筑爆破拆除技术肯定不能满足钢结构建筑拆除的需要,亟待需要找到一种新的拆除方法来解决这个问题.本文通过对聚能切割技术原理的介绍及在多领域中的应用,探讨了该原理在钢结构建筑拆除中的应用前景.由于聚能切割技术具有高效、操作方便、安全可靠和不受环境限制等,所以聚能切割在钢结构建筑拆除中必将有很广阔的应用.     

等离子弧切割工艺及提高切割质量的措施

通过对数控等离子弧切割技术进行分析,对等离子切割电流、切割电压、切割速度、气体流量、喷嘴距工件的高度等进行选择和优化控制,取得了良好的切割质量,同时也为数控等离子弧切割的应用提供了参考建议。     

浅谈我国的切割技术和行业现状及发展前景

板材切割是焊接成品加工过程中的首要步骤，智能化精密切割将成为切割行业今后发展的趋势。介绍了国外一些切割技术的发展趋势和动态。利用激光切割技术替代火焰和等离子切割，将成为今后切割技术发展的趋势。     

三种动生感应电动势的计算方法

因导体切割磁感线而产生感应电动势称为动生感应电动势,计算动生感应电动势通常有三种方法.一、导体平动切割磁感线而产生的感应电动势     

激光显微切割技术切割棉花单条染色体的研究

为使冷激光显微切割技术在植物染色体遗传分析中广泛应用,本研究利用SLuCUT全自动激光显微切割系统对亚洲棉单条染色体进行了微切割、微收集和微克隆研究.结果表明,SLuCUT全自动激光显微切割系统切割植物单条染色体具有操作简单、快速准确、污染轻等优点.SLuCUT全自动激光显微切割系统是目前最先进、最高效的染色体微切割、微分离和微收集系统.     

陶瓷等脆硬板材的磨粒水射流(AWJ)切割技术

陶瓷等脆硬材料板材在普通方法切割加工时容易破碎,也不能切割加工出特别复杂的形状和图案。分析磨料水射流技术原理和材料去除机理,重点介绍几种脆硬材料的水磨料射流切割应用示例,并总结其技术优势和推广意义。     

双轨异步激光图像识别切割系统设计关键技术

基于鞋服和工艺品等大幅面面料切割需求现状,在分析了其关键技术问题的基础上,设计了一种由机架、运动系统、激光器及光路系统、图像采集与识别系统、控制系统和自动送料及分拣系统等组成的双岗位激光异步切割系统,满足无设计图的双轨异步数控切割与自动送料要求;优化双轨异步激光切割的软硬件配置和参数,取得了切割精度高、材料适应性广、切割幅面大、切割效率高等应用效果。     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

Western and Eastern culture differences in commercial field

The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity.     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

风的曲线

Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose.