fluent软件在径向吸附器流场模拟的应用

介绍了影响立式径向流吸附器气流分布的因素,用fluent软件对吸附器在吸附过程和再生过程的流场进行数值模拟,分析径向流吸附器气流径向速度沿轴向的分布。指出在设计中应注意吸附器再生工况下,吸附器顶部区域分子筛的再生情况。     

Barriers to entry in the healthcare markets: Winners and Losers from certificate-of-need laws

In states with Certificate of Need (CON) laws, medical services providers must file an application and demonstrate community need before being permitted to start or expand a service. We examine CON laws for magnetic resonance imaging (MRI), computed tomography (CT), and positron emission tomography (PET) scanners to test the hypothesis that the approval process favors established incumbent hospitals over new hospital entrants and nonhospital providers. Using Medicare claims data in 2013, we find that states with CON laws have 20 to 33% fewer providers, depending on the type of scanners to which the laws apply. As a result, residents of CON law states are 3.4–5.3 percentage points more likely to travel outside their home county to obtain imaging services than residents of non-CON states. In addition, there is a notable shift in the type of provider: CON laws are associated with 27–53% fewer scans by nonhospital providers per beneficiary, 23 to 70% fewer by new hospitals, but 6 to 21% more scans in older hospitals.     

A brain imaging study of the choice procedure

We study the behavior of subjects facing choices between certain, risky, and ambiguous lotteries. Subjects' choices are consistent with the economic theories modeling ambiguity aversion. Our results support the conjecture that subjects face choice tasks as an estimation of the value of the lotteries, and that the difficulty of the choice is an important explanatory variable (in addition to risk and ambiguity aversion).The brain imaging data suggest that such estimation is of an approximate nature when the choices involve ambiguous and risky lotteries, as the regions in the brain that are activated are typically located in parietal lobes. Thus such choices require mental faculties that are shared by all mammals, and in particular are independent of language. In contrast, choices involving partial ambiguous lotteries additionally produce an activation of the frontal region, which indicates a different, more sophisticated cognitive process.     

基于动态规划算法的无源毫米波弱小目标检测方法

针对无源毫米波弱小目标特点,结合已有的动态规划算法,利用图像阈值分割原理实时计算检测门限,提出一种适用于无源毫米波小目标检测的实用动态规划算法,并分析了动态规划的计算过程及分割门限的确定方法。实验仿真结果表明,此算法能准确检测出复杂背景下的低信噪比无源毫米波弱小目标,并得到目标运动轨迹,在单帧成像信噪比为4.5dB左右时,能准确检测出目标运动轨迹。     

The state of technological sophistication and the need for new specialised tertiary degrees in food services

Hospitality management graduates have limited insights into latest operational/technological concepts such as Industrial Cuisine, Molecular Gastronomy and Personalised Nutrition. In fact, ‘hard’ or equipment-based technologies support the two major strategic options, cost leadership and differentiation. At present, suppliers and governments, but not operators, drive research and development in the field. In the education sector, new specialised curricula incorporating pathways stemming from natural science are needed to equip future graduates with ‘cutting edge’ skills for innovation at product, process and system levels. The research-teaching cycle can be strengthened by sharing degrees with departments of science and engineering across tertiary institutions.     

浅谈遥感技术在测绘领域的发展应用

随着整个科学技术的飞速发展,遥感技术的发展是计算机、空间、通信、电子学等新兴技术和传统的物理、地学、数学、生物等科学的交叉、渗透、融汇和集成形成的一个新兴科学技术领域。具有宏观、动态、综合、快速、多层次、多时相的优势。所以,针对遥感技术的分析与研究,对于工作成果在综合测绘工作中的要求,探讨在测绘发展领域应用遥感技术的优势和条件。发现遥感技术为传统的测绘工作带来了更大的方便与快捷,从而提高了结果的准确性与精确度。     

Flash3D在网络三维课件制作中的探索

本文尝试以Flash三维场景显示的实例,为网络三维课件的制作提供参考和经验。     

医学影像技术学教学实践探讨

目的:针对现代医学影像技术学的数字化的特点,探讨临床教学的新方法。方法:要求学生理论知识要融会贯通,临床实习要保障学生动手时间,强化学生动手能力。结果:学生能较熟练地操作使用现代化影像设备。结论:强化实际操作的实习带教方法,在医学影像技术教学中收到了良好效果。     

Cost-impact of cardiac magnetic resonance imaging with Fast-SENC compared to SPECT in the diagnosis of coronary artery disease in the U.S

Aims: The purpose of this study is to assess the economic cost differences and the associated treatment resource changes between the developing coronary artery disease (CAD) diagnostic tool fast strain-encoded cardiac imaging (Fast-SENC) and the current commonly used stress test single-photon emission computed tomography (SPECT).

Materials and methods: A “payer perspective” model was created first, consisting of long-term and short-term components that used a hypothetical cohort of patients of average age (60.8?years) presenting with chest pain and suspected CAD to assess cost-impact. A cost impact model was then built that assessed likely savings from a “hospital perspective” from substituting Fast-SENC for a portion of SPECTs assuming an average number of annual SPECT tests performed in US hospitals.

Results: In the payer model, using Fast-SENC followed by coronary angiography (CA) and percutaneous coronary intervention (PCI) treatment when necessary is less costly than the SPECT method when considering both direct and indirect costs of testing. Expected costs of the Fast-SENC were between $2,510 and $2,632 per correct diagnosis, while expected costs for the SPECT were between $3,157 and $4,078. Fast-SENC reduced false positives by 50% and false negatives by 86%, generating additional cost savings. The hospital model showed total costs per CAD patient visit of $825 for SPECT and $376 for Fast-SENC.

Limitations: Limitations of this study are that clinical data are sourced from other published clinical trials on how CAD diagnostic strategies impact clinical outcome, and that necessary assumptions were made which impact health outcomes.

Conclusion: The lower cost, higher sensitivity and specificity rates, and faster, less burdensome process for detecting CAD patients make Fast-SENC a more capable and economically beneficial stress test than SPECT. The payer model and hospital model demonstrate an alignment between payer and provider economics as Fast-SENC provides monetary savings for patients and resource benefits for hospitals.     

光学相干层析成像综述

光学相干层析成像(OCT)是一个新兴的、非常有前景的、非侵入、非接触和非损坏的成像技术并已被广泛应用在生物、医药及材料等领域。本文介绍了OCT领域的发展。