Augment low-field intra-operative MRI with preoperative MRI using a hybrid non-rigid registration method

Background

Preoperatively acquired diffusion tensor image (DTI) and blood oxygen level dependent (BOLD) have been proved to be effective in providing more anatomical and functional information; however, the brain deformation induced by brain shift and tumor resection severely impairs the correspondence between the image space and the patient space in image-guided neurosurgery.

Method

To address the brain deformation, we developed a hybrid non-rigid registration method to register high-field preoperative MRI with low-field intra-operative MRI in order to recover the deformation induced by brain shift and tumor resection. The registered DTI and BOLD are fused with low-field intra-operative MRI for image-guided neurosurgery.

Results

The proposed hybrid registration method was evaluated by comparing the landmarks predicted by the hybrid registration method with the landmarks identified in the low-field intra-operative MRI for 10 patients. The prediction error of the hybrid method is 1.92 ± 0.54 mm, and the compensation accuracy is 74.3 ± 5.0%. Compared to the landmarks far from the resection region, those near the resection region demonstrated a higher compensation accuracy (P-value = .003) although these landmarks had larger initial displacements.

Conclusions

The proposed hybrid registration method is able to bring preoperatively acquired BOLD and DTI into the operating room and compensate for the deformation to augment low-field intra-operative MRI with rich anatomical and functional information.     

液体苯系物等类油物质吸附材料综述

近年来,苯系物等类油物质泄漏事故频发。由于苯系物多数具有极强的毒性和挥发性,因此苯系物比原油等重油泄漏事故引发的危害更大。考虑到苯系物和油类物质理化性质的相似性,对苯系物泄漏事故的应急处置办法可以参考溢油事故的处置办法。通过对溢油事故中常用的无机类吸附材料、有机高分子吸附材料和天然高分子吸附材料的研究现状和应用前景进行了综述,希望能够为相关科研工作者解决苯系物泄漏的应急处置提供思路,促进该领域的快速发展。     

风火联合系统不同备用模式的风险调度策略研究

电侧的需求响应以及蓄电设备运行灵活,可以作为虚拟备用资源,保障含风电等间歇性新能源发电的电力系统安全。为衡量虚拟备用资源给系统经济性和环保性的影响,分别建立传统火电备用和虚拟快速备用这2种含风电并网的电力调度模型。并考虑新能源输出功率、电力市场、机组参数等不确定因素给系统优化带来的风险,将区间两阶段随机优化模型与CVaR风险规避相结合,利用区间数、概率数对系统供给侧和需求侧的不确定因素与优化函数有效结合,同时体现决策者风险偏好。算例分析表明,此混合优化算法能够对含风电并网的电力系统不同旋转备用模式进行优化,权衡系统成本与系统风险。算例结果表明充分利用蓄电池、需求响应作为虚拟备用资源能有效降低系统成本和CO2排放。     

基于HHT的配电网电压波动跟踪研究

针对配电网电压时常波动的问题,提出希尔伯特黄变换(HHT)在配电网电压波动跟踪中的应用。为了解决经验模态分解(EMD)过程中的端点效应问题,采用基于波形匹配的自适应EMD端点延拓方法对信号的边缘进行了处理。HHT将电压波动情况通过固有模态函数(IMF)的电压幅值和波动时刻频率两个参数反映出来,通过Matlab编程仿真,验证了该方法在配电网电压波动跟踪中的实用性。     

漏钢预报系统在酒钢常规大板坯连铸机中的应用

介绍了漏钢的种类,漏钢预报系统的基本原理和实现方法,酒钢漏钢预报系统的软硬件结构及算法.     

烧结矿断面图像分析与操作指导系统

应用图像处理与神经网络技术,根据烧结操作人员对烧结矿FeO含量判断的方法,应用CCD摄像机采集烧结机尾断面图像对其进行实时处理、特征提取,并由根据烧结看火工的经验知识训练的BP神经网络对图像分类辨识,得出相应的FeO、燃料、水份等参数,应用人工智能方法指导生产操作.     

Reducing the Influence of the Thermally Induced Reactions on the Determination of Aroma-Active Compounds in Soy Sauce Using SDE and GC-MS/O

A method based on simultaneous distillation extraction (SDE) coupled with gas chromatography–mass spectrometry/olfactometry (GC-MS/O) was developed for the analysis of volatile profiles in soy sauce. Its optimum operating conditions were as follows: 100 mL soy sauce plus 100 mL saturated brine; 2 h extraction using 50 mL dichloromethane. Eighty-eight volatile compounds were identified. Of these, 26 aroma-active compounds were detected by GC-O including 3-(methylthio)propanal, 2-methoxy-4-vinylphenol, 2-methoxyphenol, 2-methylbutanoic acid, 2,3-butanedione, phenylacetaldehyde, 2-ethyl-6-methylpyrazine, 3-methylbutanal, 2-methylbutanal, 3-methyl-1-butanol, and 2-methyl-1-butanol (which occurred at a high odor intensity in both high-salt liquid-state fermentation soy sauce (HLFSS) and low-salt solid-state fermentation soy sauce (LSFSS). SDE analysis of the odorless soy sauce indicated 12 volatiles (mainly Strecker aldehydes and α-dicarbonyl compounds). Thus, the proportions of these compounds (1.94–54.07 %) shown in previous GC-MS results could result from thermal degradation of non-volatile compounds in soy sauce. Especially, the contribution of 3-methylbutanal, 2-methylbutanal, phenylacetaldehyde, 3-(methylthio)propanal, and 2,3-butanedione to the aroma of soy sauce could be overestimated by conventional SDE-GC-O. With a full consideration of such limitations, this study will improve the application of SDE on aroma analysis of complex food matrix.     

9.00R20 144/142F 16PR加强型全钢载重子午线轮胎的设计开发

介绍9.00R20 144/142F 16PR加强型全钢载重子午线轮胎的设计。结构设计:外直径1 025mm,断面宽260 mm,行驶面宽度215 mm,行驶面弧度高7.5 mm,胎圈着合直径511 mm,胎圈着合宽度190 mm,断面水平轴位置(H1/H2) 0.55,胎面采用阶梯状短直沟花纹设计,花纹深度24 mm,花纹饱和度69.14%,花纹节距数33。施工设计:第1和第2层带束层采用4+6×0.38HT钢丝帘线,第3层带束层采用5×0.38HEI钢丝帘线,0°带束层采用3×7×0.22HE钢丝帘线,胎体采用0.25+(6+12)×0.225HT钢丝帘线,采用一次法成型机成型、热板式硫化机硫化。成品性能试验结果表明:成品轮胎的充气外缘尺寸、强度性能和耐久性能均达到国家标准要求。     

Effects of pressure and temperature on fixed-site carrier membrane for CO2 separation from natural gas

In this paper, the effect of testing temperature on the performance of fixed carrier membrane for CO₂ separation were studied. The blend composite membranes were developed respectively with a blend of PEI-PVA (polyetheleneimine-polyvinyl alcohol) as separation layer and PS (polysulfone) ultrafiltration membranes as the substrates. The permselectivity of the membranes was measured with CO₂/CH₄ mixed gas. The effect of testing temperature on membrane separation performance was investigated. The results showed that both the permeances of CO₂ and CH₄ decreased with the increase of temperature, and the permeances decreased more quickly under low pressure than those under high pressure. At the feed pressure of 0.11 MPa, the CO₂/ CH₄ selectivity of PEI-PVA/PS blend composite membrane reduced along with temperature increment. Under the feed pressure of 0.21 MPa, as well as 1.11 MPa, the selectivity decreased with the increase of temperature.     

千鹅冲铜钼矿床地球物理特征及找矿模型

大别山北麓千鹅冲铜钼矿是斑岩型矿床,矿体、控矿构造、岩浆岩、赋矿地层以及周围地质体之间存在某种物理性能差异,具有明显的地球物理异常特征。对此,在对矿床地球物理特征分析的基础上,建立了该区域的地球物理找矿模型,以期为正在进行中的大别山地区多金属成矿带的找矿工作提供参考。