Sparse-view neutron CT 3D image reconstruction algorithm based on split Bregman method

As a complement to X-ray computed tomography(CT),neutron tomography has been extensively used in nuclear engineer-ing,materials science,cultural heritage,and industrial applications.Reconstruction of the attenuation matrix for neutron tomography with a traditional analytical algorithm requires hundreds of projection views in the range of 0°to 180°and typically takes several hours to complete.Such a low time-resolved resolution degrades the quality of neutron imaging.Decreasing the number of projection acquisitions is an important approach to improve the time resolution of images;however,this requires efficient reconstruction algorithms.Therefore,sparse-view reconstruction algorithms in neutron tomography need to be investigated.In this study,we investigated the three-dimensional reconstruction algorithm for sparse-view neu-tron CT scans.To enhance the reconstructed image quality of neutron CT,we propose an algorithm that uses OS-SART to reconstruct images and a split Bregman to solve for the total variation(SBTV).A comparative analysis of the performances of each reconstruction algorithm was performed using simulated and actual experimental data.According to the analyzed results,OS-SART-SBTV is superior to the other algorithms in terms of denoising,suppressing artifacts,and preserving detailed structural information of images.

Genetic Variation Analysis of 3D Gene and Molecular Detection of Porcine Kobuvirus in 2013-2014

[Objective] This study aimed to investigate the prevalence and variation of porcine kobuvirus （PKV） in suckling piglets in China. [Method] In 2013-2014, 224 feces samples from suckling piglets with diarrhea in 27 pig farms of five provinces in China were collected to detect 3D genes of PKV with RT-PCR method; the sequences and genetic variation of 29 PKV 3D genes were analyzed. [Result] Total positive rate of PKV in feces samples from suckling piglets with diarrhea was 65.18% （146/224）; total positive rate of PKV in pig farms was 85,2% （23/27）; nucleotide sequences and the deduced amino acid sequences of 29 PKV 3D genes shared 87.0%-100% and 92.7%-100% homologies with six PKV-related 3D sequences, respectively. [Conclusion] PKV infection is prevalent in suckling piglets in China; PKV 3D genes exhibit high diversity.

Design,fabrication,and structural safety validation of 3D-printable biporous bone augments

The use of commercial products such as a cup and liner for total hip arthroplasty for patients with severe bone defects has a high probability of failure.In these patients the cup alone cannot cover the bone defect,and thus,an additional augment or cage is required.In this study,we designed three-dimensional(3D)printable bone augments as an alternative to surgeries using reinforcement cages.Thirty-five sharp-edged bone augments of various sizes were 3D printed.A biporous structure was designed to reduce the weight of the augment and to facilitate bone ingrowth.Two types of frames were used to prevent damage to the augment’s porous structure and maintain its stability during printing.Furthermore,two types of holes were provided for easy augment fixation at various angles.Fatigue tests were performed on a combination of worst-case sizes derived using finite element analysis.The test results confirmed the structural stability of the specimens at a load of 5340 N.Although the porosity of the specimens was measured to be 63.70%,it cannot be said that the porous nature was uniformly distributed because porosity tests were performed locally and randomly.In summary,3D-printable biporous bone augments capable of bonding from various angles and bidirectionally through angulation and bottom-plane screw holes are proposed.The mechanical results with bone augments indicate good structural safety in patients.However,further research is necessary to study the clinical applications of the proposed bone augment.

Structural Variation between the Western and Eastern Kuqa Fold-and-thrust Belt,China:Insights from Seismic Interpretation and Analog Modeling

The Kuqa fold-and-thrust belt exhibits apparent structural variation in the western and eastern zone.Two salt layer act as effective decollements and influence the varied deformation.In this study,detailed seismic interpretations and analog modeling are presented to construct the suprasalt and subsalt structures in the transfer zone of the middle Kuqa and investigate the influence of the two salt layers.The results reveal that the relationship of the two salt layers changes from separated to connected,and then overlapped toward the foreland in the transfer zone.Different structural models are formed in the suprasalt and subsalt units due to the interaction of the two salt layers.The imbricate thrust faults form two broom-like fault systems in the subsalt units.The suprasalt units develop detached folds terminating toward the east in the region near the orogenic belt.Whereas,two offset anticlines with different trends develop at the frontal edge of the lower salt layer and the trailing edge of the upper salt layer,respectively.According to exploration results in this region,the relationship between suprasalt and subsalt structures has an influence on hydrocarbon accumulation.We believe that the connected deformation contains high-risk plays while the decoupled deformation contains well-preserved plays.

从蓝光原盘到3D TotalMedia Theatre5

Total Media Theatre3的原盘播放功能使很多HTPC玩家将其列为主力蓝光电影播放软件，而Total Media Theatre 5则把3D引向了我们所关注的前台。

3-D整体变分视频去隔行方法

提出了一种基于3D整体变分模型的视频去隔行方法。首先根据整体变分修复模型,建立3D灰度空间的光滑性能量函数,形成对隔行区域插值的约束;然后利用变分法将最小化能量函数的问题,转化为对Euler-La-grange方程的求解;最后根据隔行视频的特性,给出了一种非迭代的离散实现方法。实验结果表明,和常见的几种去隔行方法相比,本文方法能够较好地抑制边沿锯齿和运动虚像。

血清酮体总量(D-3羟丁酸+乙酰乙酸)测定方法学研究

目的建立一种血清酮体总量(D-3羟丁酸+乙酰乙酸)在全自动生化分析仪上的一种检测方法,用于监测糖尿病酮症酸中毒。方法根据血酮体在体内的代谢过程及体外反应原理,即乙酰乙酸和D-3羟丁酸的相互转化过程,采用酶动力学方法,建立体外定量血清总酮体的测定方法。结果该法操作简便,适用于自动化生化分析仪,各项实验指标达到要求,与英国朗道公司的D-3羟丁酸试剂盒检测的D-3羟丁酸具有高度相关性。结论测定血清酮体总量和单独测D-3羟丁酸相比,可以大大提高酮症的阳性检出率,对及早发现糖尿病酮症,及时纠正酮症及预防酸中毒具有非常重要的临床意义。

蛛形图的D(3)-点可区别的全染色

利用穷举法和组合分析法讨论了蛛形图的D(3)-点可区别的全染色,得到了蛛形图的D(3)-点可区别的全色数.

Elastoplastic 3D Deformation and Stress Analysis of Strip Rolling

An elastoplastic method for analyzing the 3D deformation, stress and transverse distribution of tension stress during cold strip rolling is developed. The analysis is based on the elastoplastic variational principle in which a kinematically admissible velocity field is constructed with the lateral flow function as an unknown function. The stress distribution and volume strain distribution are obtained by solving the simultaneous equations formed by the longitudinal differential equation of equilibrium and constitutive equations. The lateral flow function is determined by minimizing the total energy dissipation rate. Experimental investigation was carried out on a reversible cold mill. The front tension stress distributions in cold rolled strips were measured by a multi roll segmented tension sensing shapemeter. The calculated results are in good agreement with the measured ones.

A Prototype Regional GSI-based EnKF-Variational Hybrid Data Assimilation System for the Rapid Refresh Forecasting System：Dual-Resolution Implementation and Testing Results

A dual-resolution（DR） version of a regional ensemble Kalman filter（EnKF）-3D ensemble variational（3DEnVar） coupled hybrid data assimilation system is implemented as a prototype for the operational Rapid Refresh forecasting system. The DR 3DEnVar system combines a high-resolution（HR） deterministic background forecast with lower-resolution（LR） EnKF ensemble perturbations used for flow-dependent background error covariance to produce a HR analysis. The computational cost is substantially reduced by running the ensemble forecasts and EnKF analyses at LR. The DR 3DEnVar system is tested with 3-h cycles over a 9-day period using a 40/13-km grid spacing combination. The HR forecasts from the DR hybrid analyses are compared with forecasts launched from HR Gridpoint Statistical Interpolation（GSI） 3D variational（3DVar）analyses, and single LR hybrid analyses interpolated to the HR grid. With the DR 3DEnVar system, a 90% weight for the ensemble covariance yields the lowest forecast errors and the DR hybrid system clearly outperforms the HR GSI 3DVar.Humidity and wind forecasts are also better than those launched from interpolated LR hybrid analyses, but the temperature forecasts are slightly worse. The humidity forecasts are improved most. For precipitation forecasts, the DR 3DEnVar always outperforms HR GSI 3DVar. It also outperforms the LR 3DEnVar, except for the initial forecast period and lower thresholds.

北京地区周岁内婴幼儿维生素D营养状况调查分析

目的 对本地区2022年7月至2023年6月来我院健康查体的周岁内婴幼儿维生素D营养状况和差异进行比较分析。方法 选取2022年7月至2023年6月来我院健康查体的周岁内,无急、慢性疾病的婴幼儿作为研究对象。取受试儿童末梢血,利用荧光免疫层析法对其血液中的总维生素D和25-羟基维生素D_(3)进行检测,并对数据进行分析和比较。结果 本地区周岁内婴幼儿整体维生素D营养状况良好,3/4婴幼儿维生素D为理想水平,维生素D缺乏者占比小于1.3%,且无严重缺乏者。随月龄增大,维生素D理想水平的婴幼儿比例减低,维生素D充足和缺乏的婴幼儿比例增加。整体婴幼儿和男、女婴幼儿在周岁内总维生素D和25-羟基维生素D_(3)的平均值均随着月龄增加而呈现小幅波动,且不同月龄的总维生素D、25-羟基维生素D_(3)在整体和女婴幼儿中均存在差异(P<0.001)。除3月龄外,各月龄男、女婴幼儿的总维生素D、25-羟基维生素D_(3)及其差值、比值均无差异。半岁前,男、女婴幼儿的总维生素D和25-羟基维生素D_(3)的平均值从2月龄开始每两个月进行翻转,半岁后,整体呈每月翻转。结论 本地区周岁内婴幼儿总体维生素D营养状况良好,但仍需加强婴幼儿维生素D的合理补充。

Effective Thermal Conductivity for 3D Five-Directional Braided Composites Based on Microstructural Analysis

A method for predicting effective thermal conductivities(ETCs) of three-dimensional five-directional(3D5D) braided composites is presented. The effective thermal conductivity prediction method contains a digital image processing technology. Multiple scanning electron microscopy(SEM)images of composites are analyzed to obtain actual microstructural features. These actual microstructural features of 3D5D braided composites are introduced into representative volume element(RVE) modeling. Apart from applying actual microstructural features,compression effects between yarns are considered in the modeling of RVE,making the RVE more realistic. Therefore,the ETC prediction method establishes a representative unit cell model that better reflects the true microstructural characteristics of the 3D5D braided composites. The ETCs are predicted with the finite element method. Then thermal conductivity measurements are carried out for a 3D5D braided composite sample.By comparing the predicted ETC with the measured thermal conductivity, the whole process of the ETC prediction method is proved to be effective and accurate,where a relative error of only 2.9 % is obtained.Furthermore,the effects of microstructural features are investigated,indicating that increasing interior braiding angles and fiber fill factor can lead to higher transverse ETCs. Longitudinal ETCs decrease with increasing interior braiding angles,but increase with increasing fiber fill factor. Finally,the influence of variations of microstructure parameters observed in digital image processing are investigated. To explore the influence of variations in microstructural features on variations in predicted ETCs,the actual probability distributions of microstructural features obtained from the 3D5D braided composite sample are introduced into the ETC investigation. The results show that,compared with the interior braiding angle,variations in the fiber fill factor exhibit more significant effects on variations in ETCs.

An Experience of Short-Term Results of Laparoscopic Inguinal Hernioplasty Using 3D Mesh in a Developing Country

Background: The experience of short term results of laparoscopic inguinal hernia repair using 3D mesh in a developing country is reviewed. Methods: From January 2012 to February 2014, 53 patients underwent laparoscopic inguinal hernioplasty. A retrospective case series of 53 consecutive patients undergoing TEP/TAPP by a single surgical team was followed prospectively with a focused physical examination and interview. 4 out of 53 patients had recurrent hernia following open repairs and 49 had primary hernias. Data collected included operative time, intraoperative bleeding, intraoperative difficulties, immediate postoperative pain, chronic groin pain, recurrence, sensory disturbance, activity or occupational limitation and personal satisfaction. Results: All the patients were male aged 32 to 75 years with a mean age of 53.5 years. Mean operative time was 37.4 minutes;intraoperative dissection, blood loss were less;and immediate postoperative pain was negligible as assessed by VAS. There was no mortality or major morbidity. Mean follow-up was 12 months (2 to 18 months). Follow-up was completed by interview and physical examination. Hernia was not found to recur during the follow up period. Chronic pain occurred in 2 patients (3.7%), which was mild in nature. Ninety-seven percent of patients were satisfied with their repair and would or had recommended TEP/TAPP to others using 3D Mesh. Conclusions: Short-term results of TEP/TAPP hernia repair using 3D mesh demonstrated to be an effective and safe procedure with low prevalence of chronic pain that is generally of a mild, infrequent nature. It was also concurred that there is decrease in operative time. Manipulation of mesh was significantly reduced. Intraoperative bleeding and use of post operative analgesia was reduced considerably. There was no recurrence, however the cost of the mesh increased the overall cost of the procedure acting as a limiting factor in a developing country.

Space-Temporal Variation in Underground Water Some Quality Parameters in Klodzko Water Intake Area Using Statistical and Geostatistical Methods （SW Part of Poland）

This paper presents selected results of research connected with the development of a （3D） geostatistical hydrogeochemical model of the Klodzko Drainage Basin, dedicated to the spatial and time variation in the selected quality parameters of underground water in the Klodzko water intake area （SW part of Poland） [1-6]. The research covers the period 1977-2012. Spatial analyses of the variation in different quality parameters, between others, Fe [gFe/m3], Mn [gMn/m3], ammonium ion [gNH4＋/m3] contents and oxidation capacity [gO2/m3], were carried out on the basis of the chemical determinations of the quality parameters of underground water samples taken from the wells in the water intake area [2-4]. Spatial and time variation in the parameters was analyzed on the basis of archival data （period 1977-1999） for 22 （pump and siphon） wells, later data obtained （November 2011） from tests of water taken from 14 existing wells and the latest data （January 2012） acquired from 3 new piezometers, which were made in other locations in the relevant area. Thematic databases, containing original data on coordinates X, Y （latitude, longitude） and Z （terrain elevation and time-years） and on regionalized variables, i.e. the underground water quality parameters in the Klodzko water intake area determined for different analytical configurations （22 wells, 14 wells, 14 wells ＋ 3 piezometers）, were created [2]. Both archival data （acquired in the years 1977-1999） and the latest data （collected in 2011-2012） were analyzed. These data were subjected to spatial analyses [2-6] using statistical and geostatistical methods [7-12]. The evaluation of basic statistics of the investigated quality parameters, including their histograms of distributions, scatter diagrams between these parameters and also correlation coefficients r, were presented in this article. The directional semivariogram function and the ordinary （block） kriging procedure were used to build the 3D geostatistical model. The geostatistical parameters of the theoretical models of directional semivariograms of the studied water quality parameters, calculated along the time interval and the well depth （taking into account the terrain elevation）, were used in the ordinary （block） kriging estimation. The obtained results of estimation, allowed to determine the levels of increased values Z＊ of studied underground water quality parameters [2, 4-6]. Generally, the behaviour of the underground water quality parameters has been found to vary in space and time. Thanks to the spatial analyses of the variation in the quality parameters in the Klodzko underground water intake area some regularities （trends） in the variation in water quality have been identified.

Early Clinical Outcomes with a 3-D Porous Titanium Acetabular Cup

Cementless acetabular components are associated with a significant incidence of polyethylene wear and secondary osteolysis. 3-dimentional (3-D) porous coating and enhanced shell to a liner fixation are expected to reduce the polyethylene wear and to increase the longevity of an acetabular cup. The authors report the early clinical outcome with a cementless acetabular cup, Regenerex Ringloc+ (Zimmer Biomet, Warsaw, IN) for total hip arthroplasty. Between 2007 and 2013, the registry with 476 hip joints was reviewed retrospectively. There were 210 (48.4%) female and 224 (51.6%) male patients. The average age of the patients at the surgery was 63.9 (± 12.0) years and the average follow-up period was 2.6 years [0.5, 6.5]. At the final follow-up, there was no loosening or cup failure. There were 2 infections, 1 dislocation and 1 liner fracture, resulting in revision hip surgery. Average Harris hip score improved from 53.9 preoperatively to 91.4 postoperatively. The survivorship of Regenerex Ring Loc+ cup and the low complication rate is comparable with previous studies using other 3-D porous metal prostheses. Although this short-term outcome from the institute is very encouraging, a longer follow-up study is required.

加ω-3脂肪酸全肠外营养对肠梗阻术后患者肠黏膜屏障功能的影响

目的探讨加ω-3脂肪酸全肠外营养支持对肠梗阻术后肠黏膜屏障功能的影响。方法将75例肠梗阻术后患者随机分为试验组（38例）和对照组（37例）。两组患者术后开始接受5天的静脉营养支持。试验组补充ω-3脂肪酸注射100ml／d，其余热量用20％中长链混合脂肪乳剂补充。对照组脂肪乳剂的补充全部采用20％中长链混合脂肪乳剂；检测对照组及试验组治疗前1天，治疗后第5天血浆D哥L酸、二胺氧化酶（DAO）水平。检测术后第5天白蛋白，C反应蛋白，记录术后排气、排便时间和住院时间。结果试验组治疗后血浆DAO活性、D-乳酸均显著低于治疗前，差异有统计学意义（P〈0．05），对照组治疗后血浆及DAO活性及D哥L酸与治疗前比较差异无统计学意义（P〉0．05）。治疗后试验组DAO活性、D-乳酸低于对照组（P〈0．05）。术后第5天C反应蛋白、通气、排便时间和住院时间均显著低于对照组，差异有统计学意义（P〈0．05）。结论加ω-3脂肪酸全肠外营养支持有助于保护肠梗阻术后肠道黏膜上皮，降低肠黏膜的通透性。

基于OMI卫星数据的对流层O3柱总量时空分布特征分析

利用OMI卫星数据分析了2008-2017年全球及我国O 3柱总量浓度空间分布特征和长时间序列变化,总结了地形、人口密度、城市扩张和前体物NO 2等因素对中国地区O 3柱总量浓度产生的影响。结果表明,全球O 3柱总量高浓度区主要位于中低纬度且季节性差异十分显著,冬季的含量相对较低,夏季的含量相对较高。中国地区由于独特的地形条件、渐增的人口数量和稳步增长的经济发展趋势,中国O 3柱总量浓度具有东南高西北低的分布格局,且含量在逐年降低。通过对流层NO 2浓度与O 3柱总量浓度的拟合结果发现,前体物NO 2对O 3的生成和分布具有重要影响。

Z－M型脉动无级变速器CAD系统的研究

本文通过研究与开发，建立了一个相对独立的Ｚ－Ｍ＼型脉动无级变速器系列的ＣＡＤ系统。该系统主要包括Ｚ－Ｍ型脉动无级变速器的主传动机构—可调六杆机构的运动学分析；机构参数优化；零部件及其整机的三维几何造型和参数驱动式零件图的绘制。

TPUS检查对子宫全切术后患者PFD发生情况的评估价值

本文旨在分析经会阴超声(TPUS)检查对子宫全切术后患者盆底功能障碍(PFD)发生情况的评估价值。选取行子宫全切术的患者157例,根据术后是否出现PFD,分为未发生PFD组103例和发生PFD组54例,均行TPUS检查。结果显示,与未发生PFD组相比,发生PFD组膀胱下移距离、直肠下移距离、阴道穹窿下移距离、膀胱尿道后角、肛提肌裂孔左右径、前后径、面积、周长升高,尿道倾斜角降低(P<0.05)两组肛提肌厚度比较,差异无统计学意义(P>0.05)。与经会阴二维、三维、四维超声检查单独检查相比,三项联合诊断价值较高(P<0.05)。研究结果表明,子宫全切术患者术后存在PFD,TPUS检查对PFD的诊断价值较为理想,可用于子宫全切术后患者PFD发生的临床诊断评估。

龙脷叶中天然产物sauropunol A-D的全合成

Sauropunol A-D是从中药龙脷叶中分离出的具有2-脱氧-3,6脱水呋喃己糖(苷)结构的化学成分,具有潜在抗炎、抗菌等生物活性。以2-脱氧-D-阿拉伯己糖为起始原料,经多步反应获得3,5-位以对甲氧基苄基保护的伯醇中间体,对其进行三氟甲磺酰化所得的三氟甲磺酸酯中间体会自动引发分子内关环反应从而构建2-脱氧-3,6-脱水-D-葡萄糖呋喃糖苷骨架结构。经脱保护反应,最终合成了sauropunol A,B和C/D,总产率分别为21%,5%和17%(互变异构体sauropunol C/D)。基于前期文献报道,对这4个化合物(sauropunol A-D)的结构进行了确证。