Transition and Transgression of Identity in Chuck Palahniuk＇s Survivor

The post-modernist concerning with identity and subjectivity posits that identity is multi-faceted and constantly gets re-constructed by choice. This results in increasingly fragmented and unstable identities leading to an inevitable breakdown in social relationships and sanity. A limited and dependable set of coherent identities began to fragment into a diverse and unstable series of competing identities. Post-modernism stifled the idea of nation, religion, family, and identity as bedrocks of stability and security. Disillusioned post-modernist world has deconstructed the well-defined boundaries that governed the life, otherwise, transition and transgression through and across these domains became the norm that allowed negotiation in daily lives. Where the subject became a terminal of multiple networks, consciously enacting the repetitions through which identity was getting produced and changed, demonstrating identity＇s ＂performativity＂. Establishing that what we believe to be true is only a construction or an interpretation of reality, shaped by our own socially constructed bias, thereby putting to scrutiny the idea of reality and real itself, which removed any sense of objective reality and with it the notion of an objective self. Identity is constantly changing and transitioning, the idea of the self which is entangled with multiplicity, heterogeneity, difference and ceaselessly becoming caught between the present and future, real and unreal, death and life. This research paper will carry out an analysis on evidential aspects in the selected novel and will further interpret the episodes of transition and transgressions that inform this novel.

深硅刻蚀晶圆位置偏移分析与研究

晶圆位置偏移过大是导致深硅刻蚀设备发生传片报警问题的主要原因之一,尤其是在采用静电卡盘的设备中。阐述了晶圆位置发生偏移原因,重点研究了解吸附配方、顶针驱动和片间清洗方案。研究表明,静电吸盘的表面聚合物残留是导致静电释放不充分的主要因素,表面聚合物的清除有助于优化晶圆位置偏移。电动三针在固有残留静电力的情况下,通过缓慢连续升针方案缓解了跳片现象。优化片间清洗方案大幅减小表面聚合物残留。实验结果表明:优化后的解吸附配方为工艺时长90 s、电极功率1000 W、气压20 mTorr(1 mTorr≈0.133 Pa)、氩气体积流量250 mL/min,电动三针接触晶圆前、接触中、脱离静电吸盘后的升针速度分别为3、2和6 mm/s,在上述工艺条件下,通过进一步优化片间清洗方案,使得晶圆位置偏移量从初始的2~6 mm降至0.2 mm以内。

机床加工的精密气动卡盘研发

数控机床精加工工序中,自动卡盘夹紧力突变可引起机床精加工的形状误差、位置误差和环形工件的圆度误差。通过对数控机床加工的精密气动卡盘的研发与设计,可有效解决气动卡盘夹紧力突变的问题,推动我国数控机床的科技进步,为同类其他产品的设计提供分析基础和理论参考。

K51680A(G)三爪动力卡盘设计与分析

随着制造业对零件加工质量的要求越来越高,夹紧力大、装夹快、定位精度高的动力卡盘在数控机床中的需求也日益增大。通过对动力卡盘使用工况的力学分析,设计了一款K51680A(G)三爪动力卡盘;分析了影响动力卡盘初始静态夹紧力的楔面倾角与摩擦因数的关系,利用UG软件建立了三爪动力卡盘三维模型,并通过ANSYS Workbench软件对各部件进行了有限元分析,以确保产品的可靠性和稳定性。

Chuck Martin:征服“移动武装”的消费者

移动时代,这些消费者不再需要专门逛街购物,他们是＂始终＂都在购物。在移动互联网之前,一个人想购物时,需要坐在一台电脑前面上网购买,或者亲自到实体店里购买。但随着移动的兴起,这一切都改变了,消费者随时随地拿起手中的手机,就可以开始挑选产品,对比价格,下单购买。

液压动力补偿卡盘夹紧力特性分析与研究

液压动力卡盘是数控机床的核心功能部件,其设计应用水平直接影响工件的加工质量。根据液压动力补偿卡盘的结构和工作原理进行受力分析,分别推导静态和动态夹紧力理论计算模型,得出影响静态、动态夹紧力的主要因素分别是楔面倾角、摩擦因数和油缸推力、机床转速、卡盘和工件的刚度。基于有限元仿真分析平台,采用位移载荷代替输入力的方法模拟卡盘动态夹紧过程,不同工况下的夹紧力仿真与理论结果对比表明:二者数值相近,最大误差为6.2%,验证了所建立动态夹紧力理论计算模型的正确性。

Piecewise model and experiment of power chuck's gripping force loss during high speed turning

High speed power chucks are important function units in high speed turning.The gripping force loss is the primary factor limiting the rotational speed of high-speed power chucks.This paper proposes a piecewise model considering the difference of wedge transmission's radial deformation between low-speed stage and medium-to-high-speed stage,the friction forces of chuck transmission,and the compressibility of hydraulic oil in rotary hydraulic cylinders.A corrected model of gripping force loss is also established for power chucks with asymmetric stiffness.The model is verified by experiment results.It is helpful to use the piecewise model to explain the experimental phenomenon that the overall loss coefficient of gripping force increases with the rotational speed increasing at medium and high speed stages.Besides,the loss coefficients of gripping force at each stage during speeding up and the critical rotational speed between two adjacent stages are discussed.For wedge power chucks with small wedge angel(α<20°) and ordinary lubrication(μ0>0.06),the local loss coefficient of gripping force at the low speed stage is about 70% of that at the medium to high speed stage.For wedge power chucks with larger wedge angel(α>20°) or low friction coefficient(μ0<0.06),the wedge transmissions cannot self-lock at high speed stage,and the gripping force loss at the high speed stage is related to the hydraulic lock and hydraulic oil in the rotary hydraulic cylinder;the local loss coefficients of gripping force at the third stage is about 1.75 to 2.13 times that at the second stage.This work is helpful to understand the mechanism of the gripping force loss thoroughly and to optimize power chucks.

HRD800F型水平岩心钻机动力头的研制

自然资源部找矿办装备组开展了找矿装备调研和国内外找矿技术装备对比分析研究。结果表明,历经数十年积累,我国勘查技术装备的发展虽然取得了进步,但仍存在一些短板和挑战。总体上,目前我国地勘队伍装备陈旧,绿色先进装备配备少,先进仪器设备以进口为主,国内研发保障能力不足,装备产业化水平不高,野外生活安全保障条件差,亟需加强找矿装备建设,支撑全面推进绿色勘查,满足新一轮找矿突破战略行动的找矿装备新需求。自然资源部中国地质调查局率先加快构建现代化野外条件保障体系,先后制定了《关于加强地质调查野外综合保障基地使用的指导意见》等制度文件,主要任务是推动绿色勘查、缩短与国外先进装备水平的差距。为适应新一轮战略找矿行动和国家重大工程勘察精细化对装备的要求,我们研制了HRD800F型水平岩心钻机。动力头是岩心钻机的关键部件,本文阐述了该型号岩心钻机动力头设计方案和设计过程以及测试过程,并总结了该动力头的性能特点。

Finite element analysis on factors influencing the clamping force in an electrostatic chuck

As one of the core components of IC manufacturing equipment, the electrostatic chuck （ESC） has been widely applied in semiconductor processing such as etching, PVD and CVD. The clamping force of the ESC is one of the most important technical indicators. A multi-physics simulation software COMSOL is used to analyze the factors influencing the clamping force. The curves between the clamping force and the main parameters such as DC voltage, electrode thickness, electrode radius, dielectric thickness and helium gap are obtained. Moreover, the effects of these factors on the clamping force are investigated by means oforthogonal experiments. The results show that the factors can be ranked in order of voltage, electrode radius, helium gap and dielectric thickness according to their importance, which may offer certain reference for the design of ESCs.

A novel measuring method of clamping force for electrostatic chuck in semiconductor devices

Electrostatic chucks are one of the core components of semiconductor devices. As a key index of electrostatic chucks, the clamping force must be controlled within a reasonable range. Therefore, it is essential to accurately measure the clamping force. To reduce the negative factors influencing measurement precision and repeatability, this article presents a novel method to measure the clamping force and we elaborate both the principle and the key procedure. A micro-force probe component is introduced to monitor, adjust, and eliminate the gap between the wafer and the electrostatic chuck. The contact force between the ruby probe and the wafer is selected as an important parameter to characterize de-chucking, and we have found that the moment of de-chucking can be exactly judged. Moreover, this article derives the formula calibrating equivalent action area of backside gas pressure under real working conditions, which can effectively connect the backside gas pressure at the moment of de-chucking and the clamping force. The experiments were then performed on a self-designed measuring platform.The de-chucking mechanism is discussed in light of our analysis of the experimental data. Determination criteria for de-chucking point are summed up. It is found that the relationship between de-chucking pressure and applied voltage conforms well to quadratic equation. Meanwhile, the result reveals that actual de-chucking behavior is much more complicated than the description given in the classical empirical formula.

“8”字型光缆卡盘拉伸后局部弯曲变形的原因分析

“8”字型自承式光缆在经过卡盘拉伸试验后,在出卡盘3m长范围内的光缆经常会出现不同程度的弯曲变形,变形光缆不仅影响客户感知,变形严重的甚至会影响光缆的施工和传输性能。本文通过大量的试验探究,发现“8”字型光缆吊线和光单元外径不一致的结构特点叠加卡盘拉伸的试验方式共同导致了光缆拉伸后发生局部变形。

膨胀夹头式自动进给钻应用技术分析

随着航空装备的快速发展,传统手工制孔方式已经不能满足现代化飞机装配制孔需求,根据飞机装配典型应用工况,在保证孔径、锪窝精度前提下,先进高效的半自动制孔技术成为急需突破的关键技术。本文从自动进给钻的实际应用出发,研究了最新膨胀夹头式自动进给钻配套刀具、进给量与转速和叠层厚度等因素对制孔精度的影响,为膨胀夹头式自动进给钻在航空装配制孔的推广应用提供一定参考。

陶瓷静电卡盘叠片机的设计与实现

陶瓷静电卡盘是半导体以及光学设备中的关键器件之一,主要起到固定衬底快速加热的作用,其性能与稳定性直接影响芯片制造的质量和效率。叠片工艺是实现陶瓷静电卡盘吸附和保证温度均匀性的关键工艺。多层陶瓷基板叠片机作为一种先进的精密加工设备,以其高精度、高效率的特点,在HTCC和LTCC等行业内应用广泛,但国内尚未有适用于陶瓷静电卡盘研发的叠片机。旨在通过分析陶瓷静电卡盘陶瓷基板的特点,开展大尺寸生瓷片叠片设备的研究,探索叠片机在陶瓷静电卡盘制造中的应用。

Design space of electrostatic chuck in etching chamber

One of the core semiconductor devices is the electrostatic chuck. It has been widely used in plasma- based and vacuum-based semiconductor processing. The electrostatic chuck plays an important role in adsorbing and cooling/heating wafers, and has technical advantages on non-edge exclusion, high reliability, wafer planarity, particles reduction and so on. This article extracts key design elements from the existing knowledge and techniques of electrostatic chuck by the method proposed by Paul and Beitz, and establishes a design space systematically. The design space is composed of working objects, working principles and working structures. The working objects in- volve electrostatic chuck components and materials, classifications, and relevant properties; the working principles involve clamping force, residual force, and temperature control; the working structures describe how to compose an electrostatic chuck and to fulfill the overall functions. The systematic design space exhibits the main issues during electrostatic chuck design. The design space will facilitate and inspire designers to improve the design quality and shorten the design time in the conceptual design.

四轴数控机床对刀方法研究

根据多轴数控机床的运动结构特性对四轴数控机床进行分类,提出卡盘式立式四轴类、桥板式卧式四轴类两种四轴数控机床的对刀方法,为不同结构类型多轴数控机床的对刀提供有效参考。

激光切管机用伺服驱动双动尾卡的设计

针对市场上现有的激光切管机尾部双动夹持卡盘存在漏气和卡死的问题,运用SolidWorks和Ansys Workbench重新设计了一款由伺服驱动的全电动卡盘。该电动卡盘由PLC程序控制,夹紧力参数和夹持速度均由触摸屏输入,智能化程度高,操作便捷。同时由于摒弃了传统的压缩空气作为动力源,生产环境有了明显的改善。

一种三点机械限位装置研制与运动仿真分析

涉及机械装配工装夹具领域,应用于组件三点机械限位装配,设计一款高效便捷满足批量产品装配一致性要求的气动装置。基于三爪气动卡盘,通过三维建模软件设计一款新型气动装置。通过对组件整体结构装配尺寸设计,满足两组件空间Z轴方向精准限位,同时实现三点均布限位装配模式。通过气动卡盘三爪向心运动,实现对薄壁圆柱壳体三点加持变形,完成壳体内部组件机械限位和装配。通过仿真软件完成气动系统内部传动机构运动学和动力学仿真分析。

光缆绞合生产中一种油膏涂敷检测装置的设计与运用

在光网通讯行业中为了使光纤能在各种环境条件下敷设和使用,必须把光纤与其他保护元件结合起来制成光缆。光缆必须具有优良的光传输性能及抗拉、抗冲击、抗弯、抗扭等机械性能。大部分光缆为保证抗拉、抗冲击、抗弯、抗扭等机械性能,需在成缆工序时以钢丝来进行绞合,为保证绞合后缆芯的渗水性,需在绞合前为钢丝涂敷油膏。本设计提供一种增加装置工作连续性,提高装置功能多样性的油膏涂敷检测装置。

轴承加工变形控制研究进展综述

随着工程机械技术的发展,对性能轴承的需求愈加强烈,由于轴承加工过程中夹持变形、切削变形和热变形等问题的存在,严重制约了轴承成品的精度,所以轴承加工过程中的变形控制技术成为各厂家、院校研究的重点。对轴承加工变形控制研究进展进行了介绍,在分析了轴承加工变形的成因(包括切削力、切削温度和切削刀具等因素)的基础上,详细介绍了常用的轴承加工变形控制方法,如改变加工方式、改变卡盘的结构以及加工参数控制等;最后,分析了目前采用的各类轴承加工变形控制方法的优劣性,并且探讨了未来轴承加工变形控制研究的趋势。考虑到轴承加工变形控制研究是机械加工领域的重要方向,将为提高轴承加工质量和效率带来积极作用。

多晶硅棍状(Stick Particle)缺陷的分析与优化

阐述HK制程多晶硅P1HM步骤后的棍状(stick particle)的缺陷。因腔体作业所需条件,整个腔体侧壁与底部静电吸盘上都附着SICL4+O2生成的SIO2的coating材料,刻蚀过程中可能会有聚合物(polymer)掉落或静电吸盘吸附的晶圆背面掉落到下片导致的棍状缺陷,导致在P1LEC步骤刻蚀变为阻挡层刻蚀,P1LEC后变为Poly Block ETCH。探讨针对stick PA的解决方案。