Confirmation Bias in Online Searches: Impacts of Selective Exposure Before an Election on Political Attitude Strength and Shifts

Impacts of Internet use on political information seeking and subsequent processes have been subject to much debate. A 2‐session online field study presented online search results on political topics to examine selective exposure and its attitudinal impacts. Session 1 captured attitudes, including their accessibility. Session 2 tracked what online search results participants selected and how long they read them; participants then reported attitudes again. The study represented a 4x8x2x2 within‐subjects design: 4 topics, 8 browsing intervals each, with articles presenting opposing stances, with low versus high source credibility. Attitude‐consistent messages and messages from high‐credibility sources were preferred. Exposure to attitude‐consistent search results increased attitude accessibility and reinforced attitudes, whereas exposure to attitude‐discrepant content had opposite effects, regardless of messages' source credibility.     

氪气与氙气中氟化物杂质净除技术的研究与应用

经过近 10年的探索、研究与实践 ,在国内最先发现并确认了采用深冷法分离空气生产的氪气与氙气中存在着三种氟化物杂质。为净除这些有害杂质 ,研制出了一种专用净化材料和成套终端净化装置 ,这种装置可同时有效地将这三种利用其他方法难以净除的氟化物彻底清除干净。该净除方法经实际应用并与国外其他净除方法相比较 ,优点突出     

Effects of part geometry and injection molding conditions on the tensile properties of ultra-high molecular weight polyethylene polymer

In this study, the influences of process parameters and different cross-sectional dimensions on the tensile strength of specimens with and without a weld line are investigated. In addition, the weld line characteristics of structures with different cross-sections are explored as well. With the Taguchi method and confirmation test, it can be concluded that Taguchi method is suitable to improve the mechanical properties occurring in the injection molded UHMWPE parts. The single-factor experimental results indicate that the process parametric influence is relatively smaller than the cross-sectional dimensions on the tensile strength of specimens without weld line. The experimental observations present that the frictional heating can be enhanced the molecular bonding and self-diffusion in the frozen layer of two sides on the weld line region. The SEM images showed that the micro-voids, cracks and incomplete molecular bonding are the major surface defects on the weld line region.     

平行导轨二滑块驱动在一侧的并联操作手的运动轨迹实现与仿真研究

以平行导轨二滑块驱动在一侧且内点作为操作点的并联机构为研究对象,在给出显式位移、速度、加速度运动学逆解模型的基础上,对其运动轨迹进行了分析仿真研究;在操作头轨迹规划中,加减速及匀速阶段采用四次多项式进行拟合,拐角段采用对称的Clothoid曲线光滑匀速过渡;同时,利用运动学逆解确定了操作点按预期轨迹运动时应在原动件上施加的运动规律;最后,利用虚拟样机技术对所规划的运动轨迹进行仿真验证.仿真结果表明:并联机构驱动滑块的速度、加速度及作用在滑块上的驱动力均为连续函数,机构运行平稳,操作点的位置和速度与规划一致,能够满足操作点快速和实时控制的要求.     

ASP．NET安全问题及解决策略

首先提出在web应用开发中会面临的一些基本安全问题，及相应的解决措施。然后对基于ASP．NET开发环境下面临的一些安全问题．给出具体的解决方案。     

Measurements of Squeeze-Film Bearing Forces and Pressures,Including the Effect of Fluid Inertia

Squeeze-film dampers are commonly applied to high-speed rotating machinery, such as aircraft engines, to reduce vibration problems. The Reynolds theory of hydrodynamic lubrication has been used for the design and modeling of dampers in rotor dynamic systems despite typical modified Reynolds numbers in applications between ten and fifty. Lubrication theory is strictly valid for Reynolds numbers much less than one, which means that fluid viscous forces are much greater than inertia forces. Theoretical papers which account for fluid inertia in squeeze films have predicted large discrepancies from lubrication theory, but these results have not found wide acceptance by workers in the field. Recently, experimental results on the behavior of rotor dynamic systems have been reported which strongly support the existence of large fluid inertia forces. In the present paper, direct measurements of damper forces and pressures are presented for tile first time at high Reynolds number. Reynolds numbers up to 13 are obtained at eccentricity ratios 0.2, 0.5, and 0.8. Lubrication theory underpredicts the measured forces by up to a factor of two (100 percent error). Qualitative agreement is found with predictions of improved theories which include fluid inertia forces.     

Impact of Tweets on Box Office Revenue: Focusing on When Tweets are Written

This study investigates the impact of tweets on box office revenue. Specifically, the study focuses on the times when tweets were written by examining the impact of pre‐ and post‐consumption tweets on box office revenue; an examination that is based on Expectation Confirmation Theory. The study also investigates the impact of intention tweets versus subjective tweets and the impact of negative tweets on box office revenue. Targeting 120 movies released in the US between February and August 2012, this study collected tweet information on a daily basis from two weeks before the opening until the closing and box office revenue information. The results indicate that the disconfirmation that occurs in relation to the total number of pre‐consumption tweets for a movie has a negative impact on box office revenue. This premise suggests that the formation of higher expectations of a movie does not always result in positive results in situations where tweets on perceived movie quality after watching spread rapidly. This study also reveals that intention tweets have stronger effects on box office revenue than subjective tweets.     

HIV抗体确认试剂国家参考品的建立

目的建立评价HIV抗体确认试剂的国家参考品。方法从我国部分地区收集HIV感染者或可疑感染者以及非HIV感染者血浆样品,并对其进行HIV抗体、核酸以及抗体条带等检测,从中筛选出有代表性的样品组成参考品,用4家不同的HIV抗体确认试剂进行检测和标化。结果共筛选出27份样品组成HIV抗体确认试剂参考品,其中10份为HIV抗体确认阳性参考品,12份为HIV抗体确认阴性参考品,5份为HIV抗体不确定参考品。用4家不同的HIV抗体确认试剂标化12次,10份HIV抗体确认阳性参考品均检测为确认阳性;5份不确定参考品均检测为确认阳性或不确定,无检测为阴性者;12份阴性参考品10次均检测为确认阴性。结论该参考品可用于评价HIV抗体确证试剂的质量。     

丙型肝炎抗体确证试剂检测结果的分析

目的分析丙型肝炎抗体确证试剂的检测结果。方法用两种国外抗HCV确证试剂(RIBA和MP)分别对89份抗HCVEIA试剂(Ortho)检测为高值阴性或弱阳性样品进行检测,按试剂说明判定结果。并对两种确证试剂对4种丙肝分片段抗体的检出率进行比较。结果两种确证试剂RIBA和MP与Ortho试剂的总符合率分别为43.8%和47.2%,均出现了较多的不确定样品。两种试剂对丙肝NS3抗体和NS5抗体的检出率基本一致,MP试剂对丙肝核心抗体和NS4抗体的检出率显著高于RIBA试剂。结论对于不确定样品,最好结合临床症状及病人追踪检测进一步确诊。