Thickness

厚度
  • 文章类型: Journal Article
    精神分裂症通常与皮质体积减少和基底神经节扩张有关,尤其是壳核。最近的全基因组关联研究强调了与kinectin1基因(KTN1)相邻的3'调节区变异在调节壳核灰质体积(GMV)中的重要性。本研究旨在全面调查该地区在精神分裂症中的参与情况。
    我们分析了4个独立的dbGaP样本中覆盖整个3个调控区的1136个单核苷酸多态性(SNPs)(4604例精神分裂症患者与4884名健康受试者)和3个独立的精神病学基因组学联盟样本(107240例与210203控件)以识别一致的关联。此外,我们在348名受试者中检测了精神分裂症相关等位基因对16个脑区KTN1mRNA表达的调节作用,以及38258名受试者中7个皮质下核的GMV,36936名受试者的整个皮质和34个皮质区域的表面积(SA)和厚度(TH)。
    25个变异的主要等位基因(f>0.5)在2至5个独立样本(8.4×10-4≤P≤.049)中增加(β>0)精神分裂症的风险。这些精神分裂症相关等位基因显着升高(β>0)基底神经节的GMV,包括壳核(6.0×10-11≤P≤1.1×10-4),尾状(8.7×10-4≤P≤9.4×10-3),苍白球(P=6.0×10-4),和伏隔核(P=2.7×10-5)。此外,它们可能会增加(β>0)后扣带和岛叶皮质的SA,以及额叶(三角部和内侧眶额)的TH,顶叶(上级,precuneus,和劣等),和时间(横向)皮质,但可能降低(β<0)整体的SA,额叶(内侧眶额),和时间(极点,上级,中间,和内嗅)皮质,以及中段额叶和上额叶皮质的TH(8.9×10-4≤P≤.050)。
    我们的发现确定了与KTN1相邻的3'调控区的显著和功能相关的风险等位基因,暗示了它们在精神分裂症发展中的关键作用。
    UNASSIGNED: Schizophrenia is often associated with volumetric reductions in cortices and expansions in basal ganglia, particularly the putamen. Recent genome-wide association studies have highlighted the significance of variants in the 3\' regulatory region adjacent to the kinectin 1 gene (KTN1) in regulating gray matter volume (GMV) of the putamen. This study aimed to comprehensively investigate the involvement of this region in schizophrenia.
    UNASSIGNED: We analyzed 1136 single-nucleotide polymorphisms (SNPs) covering the entire 3\' regulatory region in 4 independent dbGaP samples (4604 schizophrenia patients vs. 4884 healthy subjects) and 3 independent Psychiatric Genomics Consortium samples (107 240 cases vs. 210 203 controls) to identify consistent associations. Additionally, we examined the regulatory effects of schizophrenia-associated alleles on KTN1 mRNA expression in 16 brain areas among 348 subjects, as well as GMVs of 7 subcortical nuclei in 38 258 subjects, and surface areas (SA) and thickness (TH) of the entire cortex and 34 cortical areas in 36 936 subjects.
    UNASSIGNED: The major alleles (f > 0.5) of 25 variants increased (β > 0) the risk of schizophrenia across 2 to 5 independent samples (8.4 × 10-4 ≤ P ≤ .049). These schizophrenia-associated alleles significantly elevated (β > 0) GMVs of basal ganglia, including the putamen (6.0 × 10-11 ≤ P ≤ 1.1 × 10-4), caudate (8.7 × 10-4 ≤ P ≤ 9.4 × 10-3), pallidum (P = 6.0 × 10-4), and nucleus accumbens (P = 2.7 × 10-5). Moreover, they potentially augmented (β > 0) the SA of posterior cingulate and insular cortices, as well as the TH of frontal (pars triangularis and medial orbitofrontal), parietal (superior, precuneus, and inferior), and temporal (transverse) cortices, but potentially reduced (β < 0) the SA of the whole, frontal (medial orbitofrontal), and temporal (pole, superior, middle, and entorhinal) cortices, as well as the TH of rostral middle frontal and superior frontal cortices (8.9 × 10-4 ≤ P ≤ .050).
    UNASSIGNED: Our findings identify significant and functionally relevant risk alleles in the 3\' regulatory region adjacent to KTN1, implicating their crucial roles in the development of schizophrenia.
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  • 文章类型: Journal Article
    由于电子传输层(ETL)和空穴传输层(HTL)的光学特性,倒置钙钛矿太阳能电池的性能优于传统钙钛矿太阳能电池。必须比较这两种类型以了解它们的效率。在这篇文章中,我们研究了具有NiOx/CH3NH3Pb3/ETL(ETL=MoO3,TiO2,ZnO)结构的倒置钙钛矿太阳能电池。我们的结果表明,对于所有结构,NiOx的最佳厚度为80nm。对于具有ZnO和MoO3的太阳能电池,最佳钙钛矿厚度为600nm,对于具有TiO2的太阳能电池,最佳钙钛矿厚度为800nm。对于ETL,ZnO的最佳厚度为100nm,对于MoO3为80nm,对于TiO2为60nm。我们发现,ZnO的倒置钙钛矿太阳能电池的效率,MoO3和TiO2作为ETL,并具有最佳的层厚度,是30.16%,18.69%,和35.21%,分别。这些效率是1.5%,5.7%,比传统钙钛矿太阳能电池高出1.5%。我们的研究强调了优化倒置钙钛矿太阳能电池的层厚度以实现比传统结构更高的效率的潜力。
    Due to the optical properties of the electron transport layer (ETL) and hole transport layer (HTL), inverted perovskite solar cells can perform better than traditional perovskite solar cells. It is essential to compare both types to understand their efficiencies. In this article, we studied inverted perovskite solar cells with NiOx/CH3NH3Pb3/ETL (ETL = MoO3, TiO2, ZnO) structures. Our results showed that the optimal thickness of NiOx is 80 nm for all structures. The optimal perovskite thickness is 600 nm for solar cells with ZnO and MoO3, and 800 nm for those with TiO2. For the ETLs, the best thicknesses are 100 nm for ZnO, 80 nm for MoO3, and 60 nm for TiO2. We found that the efficiencies of inverted perovskite solar cells with ZnO, MoO3, and TiO2 as ETLs, and with optimal layer thicknesses, are 30.16%, 18.69%, and 35.21%, respectively. These efficiencies are 1.5%, 5.7%, and 1.5% higher than those of traditional perovskite solar cells. Our study highlights the potential of optimizing layer thicknesses in inverted perovskite solar cells to achieve higher efficiencies than traditional structures.
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  • 文章类型: Journal Article
    静脉替代品的有希望的创新和更好地了解静脉疾病需要静脉的深入机械表征。静脉的两个重要物理参数是形状和厚度,在软组织中相当具有挑战性。这里,我们提出了一种方法TREE(基于TransfeR学习的厚度估计方法)来预测静脉的分割图和厚度值。该模型包含一个编码器和两个解码器,它们以特殊方式训练以促进迁移学习。首先,编码器-解码器对被训练来预测分割图,然后,将这个具有冻结权重的预训练编码器与第二解码器配对,该第二解码器被专门训练以预测厚度图。这利用从分割模型获得的全局信息来促进厚度模型的精确学习。此外,为了提高性能,我们引入了敏感模式检测器(SPD)模块,该模块通过提取语义细节进一步指导网络。扫频源光学相干断层扫描(SS-OCT)是从患病患者中提取的隐静脉曲张的成像方式。为了演示模型的性能,我们计算了分割精度-0.993,厚度(像素)估计的均方误差-2.409,与最先进的方法相比,这两个指标都脱颖而出。
    In-depth mechanical characterization of veins is required for promising innovations of venous substitutes and for better understanding of venous diseases. Two important physical parameters of veins are shape and thickness, which are quite challenging in soft tissues. Here, we propose the method TREE (TransfeR learning-based approach for thicknEss Estimation) to predict both the segmentation map and thickness value of the veins. This model incorporates one encoder and two decoders which are trained in a special manner to facilitate transfer learning. First, an encoder-decoder pair is trained to predict segmentation maps, then this pre-trained encoder with frozen weights is paired with a second decoder that is specifically trained to predict thickness maps. This leverages the global information gained from the segmentation model to facilitate the precise learning of the thickness model. Additionally, to improve the performance we introduce a sensitive pattern detector (SPD) module which further guides the network by extracting semantic details. The swept-source optical coherence tomography (SS-OCT) is the imaging modality for saphenous varicose vein extracted from the diseased patients. To demonstrate the performance of the model, we calculated the segmentation accuracy-0.993, mean square error in thickness (pixels) estimation-2.409 and both these metrics stand out when compared with the state-of-art methods.
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  • 文章类型: Journal Article
    背景技术糖尿病(DM)是以升高的血糖水平为特征的多方面代谢紊乱。2型DM(T2DM)由于广泛发生微血管和大血管并发症而成为残疾的重要原因。根据某些研究人员的说法,已观察到长时间的血糖水平升高会引发跟腱(AT)的一系列不规则改变。AT厚度是这些变化的一个这样的指标。方法这是一项对51名个体进行的前瞻性研究,将其进一步分为3组(A组-正常个体,B组DM无足部并发症,C组-糖尿病伴足部并发症),每人17人健康,在SriDevarajUrs医学院,有足部并发症且无并发症的DM,为期一年。病人的人口统计学,基本医疗记录,和实验室测试结果进行检查和分析。结果研究参与者的平均年龄为55.41±10.25岁。三组之间的年纪和性别差别无统计学意义。各组间平均AT厚度存在显著差异(p<0.05)。与B组相比,C组中AT的平均厚度更高。A组具有最小的AT厚度。然而,各个组的变量之间没有相关性.结论糖尿病患者在足和踝关节问题发生之前,可能发生AT结构的改变。因此,AT增厚可作为糖尿病足并发症的早期指标。
    Introduction Diabetes mellitus (DM) is a multifaceted metabolic disorder distinguished by elevated blood sugar levels. Type 2-DM (T2DM) stands as a significant contributor to disability due to its widespread occurrence of microvascular and macrovascular complications. According to certain researchers, prolonged elevated blood sugar levels have been observed to trigger a sequence of irregular alterations in the Achilles tendon (AT). AT thickness is one such indicator of these alterations. Methods This was a prospective study carried out on 51 individuals which was further divided into 3 groups (Group A - Normal individuals, Group B - DM without foot complications, Group C - DM with foot complications) with 17 individuals in each as healthy, DM with foot complications and without complications at Sri Devaraj Urs Medical College over a period of one year. The patients\' demographics, basic medical records, and laboratory test results were examined and analyzed. Results The mean age of the study participants was 55.41 + 10.25 years. There was no significant difference in age and gender between the three groups. There was a significant difference in mean AT thickness between the groups (p<0.05). The mean thickness of AT was higher in Group C compared to Group B. Group A had the least AT thickness. However, there was no correlation between the variables in individual groups. Conclusions Modifications in the AT\'s structure may occur before the onset of foot and ankle issues in individuals with diabetes. Hence, the thickening of the AT can be used as an early indicator of impending diabetic foot complications.
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  • 文章类型: Journal Article
    半透明和光学特性显着影响陶瓷修复体的美观性。根据制造商的说法,通过基质烧制工艺将新的维氏晶体引入新型陶瓷高级二硅酸锂中,可以增强材料的强度和美学质量。
    四种类型的CAD/CAM陶瓷;二硅酸锂(LD),白云母增强(LR),高级二硅酸锂(ALD),和氧化锆增强的硅酸锂(ZLS)暴露于不同的染色溶液(茶,可乐,咖啡,和蒸馏水)。每种陶瓷类型有120个样本,根据厚度(0.5毫米,1mm,和1.5毫米)。热循环后测量颜色变化(ΔE00)和半透明参数(TP00),在暴露于染色溶液1、7和30天后,采用分光光度法评估ΔE00和TP00。
    ZLS表现出最低的颜色稳定性,而锂LD和ALD显示最高。厚度显著影响颜色稳定性,0.5毫米的厚度显示最小的变化。曝光的持续时间也会影响颜色变化,30天导致了最显著的转变。LD表现出最高的半透明性。与对照组相比,咖啡和茶引起半透明性和颜色稳定性的更明显降低。
    材料结构,厚度,染色溶液,和曝光时间显着影响CAD/CAM陶瓷的颜色稳定性和半透明性,LD和ALD表现出优异的颜色稳定性和LD表现出最高的半透明性。
    UNASSIGNED: Translucency and optical characteristics significantly affect the aesthetics of ceramic restorations. The introduction of new virgilite crystals to novel ceramic advanced lithium disilicate through a matrix firing process enhances the material\'s strength and aesthetic quality according to the manufacturer.
    UNASSIGNED: Four types of CAD/CAM ceramics; lithium disilicate (LD), leucite reinforced (LR), advanced lithium disilicate (ALD), and zirconia-reinforced lithium silicate (ZLS) exposed to different staining solutions (tea, cola, coffee, and distilled water). Each ceramic type had 120 specimens, divided into subgroups based on thickness (0.5 mm, 1 mm, and 1.5 mm). Color changes (ΔE00) and translucency parameters (TP00) were measured after thermocycling, and spectrophotometry was employed to evaluate ΔE00 and TP00 after 1, 7, and 30 days of exposure to the staining solutions.
    UNASSIGNED: ZLS exhibited the lowest color stability, while lithium LD and ALD displayed the highest. Thickness significantly affected color stability, with 0.5 mm thickness showing the least change. The duration of exposure also impacted color changes, with 30 days causing the most significant shift. LD demonstrated the highest translucency. Coffee and tea induced more pronounced reductions in translucency and color stability compared to the control group.
    UNASSIGNED: Material structure, thickness, staining solution, and exposure duration significantly influenced the color stability and translucency of CAD/CAM ceramics, with LD and ALD demonstrating superior color stability and LD exhibiting the highest translucency.
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  • 文章类型: Journal Article
    对于Ni-YSZ阳极支撑的固体氧化物燃料电池(SOFC),主要缺点是由于Ni/NiO体积的变化,它们容易受到还原和氧化气氛的变化。氧化时的阳极膨胀会在电池中引起明显的应力,最终导致失败。为了提高氧化还原稳定性,建立了分析模型来研究阳极结构对氧化还原稳定性的影响。与没有AFL的SOFC相比,阳极氧化后,具有阳极功能层(AFL)的SOFC的电解质和阴极中的拉伸应力分别增加了27.07%和20.77%,分别。阳极结构的厚度对结构的稳定性有很大影响。因此,还讨论了阳极厚度和AFL厚度对氧化后这两种结构中应力的影响。阳极基板的厚度在没有AFL的SOFC中比在具有AFL的SOFC中起到更重要的作用。通过增加阳极基板的厚度,电解质和阴极中的应力降低。该方法为在氧化还原条件下设计可靠的SOFC提供了理论依据,并将在将来有更多的实验证明。
    For Ni-YSZ anode-supported solid oxide fuel cells (SOFCs), the main drawback is that they are susceptible to reducing and oxidizing atmosphere changes because of the Ni/NiO volume variation. The anode expansion upon oxidation can cause significant stresses in the cell, eventually leading to failure. In order to improve the redox stability, an analytical model is developed to study the effect of anode structure on redox stability. Compared with the SOFC without AFL, the tensile stresses in the electrolyte and cathode of SOFC with an anode functional layer (AFL) after anode oxidation are increased by 27.07% and 20.77%, respectively. The thickness of the anode structure has a great influence on the structure\'s stability. Therefore, the influence of anode thickness and AFL thickness on the stress in these two structures after oxidation is also discussed. The thickness of the anode substrate plays a more important role in the SOFC without AFL than in the SOFC with AFL. By increasing the thickness of the anode substrate, the stresses in the electrolyte and cathode decrease. This method provides a theoretical basis for the design of a reliable SOFC in the redox condition and will be more reliable with more experimental proofs in the future.
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  • 文章类型: Journal Article
    这项研究的目的是研究使用清晰的矫正器在上颌弓扩张过程中不同的牙齿移动方式和矫正器厚度对牙齿和牙周组织的生物力学影响,以促进更精确和有效的临床正畸治疗。
    包括牙齿的三维模型,上颌骨,牙周膜,和对准器进行了构造和有限元分析。测量了7种牙齿位移模式的牙齿位移趋势和牙周膜应力(分为三类,包括前磨牙和磨牙的整体运动,每个步骤中磨牙的扩张逐渐增加;前磨牙和磨牙的分布运动;以及前磨牙和磨牙之间间隔交替运动)和两个矫正器厚度(0.5mm和0.75mm)。
    用清晰的矫正器扩张上颌弓时,目标牙齿的有效扩张主要表现为倾斜运动趋势。增加磨牙膨胀的量增加了第一磨牙的颊位移,但减少了前磨牙的颊位移。后牙间隔交替运动组(0.026mm)的目标牙齿平均颊位移大于前磨牙/磨牙分布运动组(0.016mm)和整体运动组(0.015mm)。矫正器厚度的增加会导致牙冠的口腔位移更大,并增加牙周韧带的应力。
    增加摩尔膨胀的量会降低前摩尔膨胀的效率。前磨牙和磨牙间隔交替运动可实现更高的牙弓扩张效率,但应注意相邻牙齿的锚固。增加矫正器的厚度会增加膨胀效率,但也会增加牙周组织的负担。
    UNASSIGNED: The objective of this study was to investigate the biomechanical effects of different tooth movement patterns and aligner thicknesses on teeth and periodontal tissues during maxillary arch expansion with clear aligners, to facilitate more precise and efficient clinical orthodontic treatments.
    UNASSIGNED: Three-dimensional models including teeth, maxilla, periodontal ligament, and aligner were constructed and subjected to finite element analysis. Tooth displacement trends and periodontal ligament stresses were measured for seven tooth displacement patterns (divided into three categories including overall movement of premolars and molars with gradually increasing molar expansion in each step; distributed movement of premolars and molars; and alternating movement between premolars and molars at intervals) and two aligner thicknesses (0.5 mm and 0.75 mm) during maxillary arch expansion with clear aligners.
    UNASSIGNED: When expanding the maxillary arch with clear aligners, the effective expansion of the target teeth mainly showed a tilting movement trend. Increasing the amount of molar expansion increased the buccal displacement of the first molar but decreased the buccal displacement of the premolars. The mean buccal displacement of the target teeth was greater in the posterior teeth interval alternating movement group (0.026 mm) than in the premolar/molar distributed movement group (0.016 mm) and the overall movement group (0.015 mm). Increasing aligner thickness resulted in greater buccal displacement of the crowns and increased stress on the periodontal ligaments.
    UNASSIGNED: Increasing the amount of molar expansion reduces the efficiency of premolar expansion. Alternating movement of premolars and molars at intervals achieves a higher arch expansion efficiency, but attention should be paid to the anchorage of adjacent teeth. Increasing the thickness of the aligner increases the expansion efficiency but may also increase the burden on the periodontal tissues.
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  • 文章类型: Journal Article
    背景:陶瓷半透明的影响,层厚度,在一些研究中,二硅酸锂玻璃陶瓷修复体的阴影和基底颜色被证明是重要的,然而,定量,关于色差与这些参数之间关系的数值结果仍然缺乏。这项体外研究的目的是定量确定二硅酸锂玻璃陶瓷的颜色再现能力如何受到其半透明性的影响。层厚度,和基材颜色。
    方法:陶瓷样品由具有高和低半透明性(HT和LT)的A2色调IPSE.maxCAD块在0.5-2.5mm(+/-0.05mm)的厚度范围内制备。利用9种色调的复合基材获得分层样品;使用透明试吃膏。在D65标准照明下用柯尼卡美能达CM-3720d分光光度计评估样品的光谱反射率。使用设定为50:50%的可感知性和可接受性阈值分析了两个样品之间的TheCIEDE2000色差(ΔE00)。统计分析包括线性回归分析和Kruskal-Wallis检验。
    结果:厚度增加0.5mm时,HT样品的ΔE00降低到72.8%,T样品的比例为71.1%(p<0.0001)。具有HT和LT样品的7种底物具有与平均值显著不同的结果(p<0.05)。0.5mm的厚度不足以在任何半透明水平下实现可接受的结果,而厚度为1.5毫米的低半透明陶瓷给出了可接受的结果,除了严重变色的底物(ND8和ND9)。
    结论:二硅酸锂微晶玻璃的颜色再现能力受半透明性的显著影响,层厚度,和检查的9个衬底中的7个衬底。
    BACKGROUND: Effects of ceramic translucency, layer thickness, and substrate colour on the shade of lithium disilicate glass-ceramic restorations proved to be significant in several studies, however, quantitative, numerical results on the relationship between the colour difference and these parameters are still lacking. The purpose of this in vitro study was to quantitatively determine how the colour reproduction ability of a lithium disilicate glass-ceramic is affected by its translucency, layer thickness, and substrate colour.
    METHODS: Ceramic samples were prepared from A2 shade IPS e.max CAD blocks with high and low translucencies (HT and LT) in a thickness range of 0.5-2.5 mm (+/- 0.05 mm). Layered samples were acquired utilizing composite substrates in 9 shades; transparent try-in paste was used. The spectral reflectance of the specimens was assessed under D65 standard illumination with a Konica Minolta CM-3720d spectrophotometer. The CIEDE2000 colour difference (ΔE00) between two samples was analysed using perceptibility and acceptability thresholds set at 50:50%. Statistical analysis involved linear regression analysis and the Kruskal-Wallis test.
    RESULTS: An increase in the thickness of 0.5 mm reduced the ΔE00 of the HT samples to 72.8%, and that of the T samples to 71.1% (p < 0.0001). 7 substrates with HT and LT specimens had significantly different results from the mean (p < 0.05). A thickness of 0.5 mm is not sufficient to achieve an acceptable result at any level of translucency, while the low translucency ceramic at a thickness of 1.5 mm gave acceptable results, except for severely discoloured substrates (ND8 and ND9).
    CONCLUSIONS: The colour reproduction ability of lithium disilicate glass-ceramics is significantly affected by their translucency, layer thickness, and 7 substrates out of 9 substrates examined.
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  • 文章类型: Journal Article
    偏头痛三叉神经血管系统的激活释放血管活性神经递质,导致血管收缩异常,这可能会影响眼部系统,导致视网膜损伤.我们研究的目的是确定偏头痛患者和健康受试者之间的每个视网膜层是否存在差异。
    一项病例对照研究招募了38名偏头痛患者和38名年龄和性别匹配的对照。光学相干断层扫描用于测量乳头周围和黄斑区视网膜神经纤维层(pRNFL和mRNFL)的厚度,神经节细胞层(GCL),内丛状层(IPL),和内部核层(INL)。
    偏头痛患者和对照组的平均年龄分别为36.29±9.45和36.45±9.27岁,分别。两组中有34例患者(89.48%)为女性。平均残疾评分为19.63±20.44(表示严重残疾)。偏头痛患者的上外层INL比对照组厚。头痛侧眼的颞部外段的GCL厚度和上外段的mRNFL厚度降低。然而,头痛侧眼的INL与残疾评分呈负相关.这是发现头痛侧眼睛的GCL和mRNFL变薄的第一项研究。偏头痛的INL也增厚,但与残疾评分呈负相关。
    偏头痛患者的INL厚度增加可能是由炎症引起的。残疾评分较高的更严重的病例可能会出现进行性视网膜神经元丢失,导致INL比不太严重的病例更薄。
    UNASSIGNED: Activation of the trigeminal vascular system in migraine releases vasoactive neurotransmitters, causing abnormal vasoconstriction, which may affect the ocular system, leading to retinal damage. The purpose of our study was to determine whether there are differences in each retinal layer between migraine patients and healthy subjects.
    UNASSIGNED: A case-control study recruited 38 migraine patients and 38 age- and sex-matched controls. Optical coherence tomography was used to measure the thickness of the peripapillary and macular retinal nerve fiber layer (pRNFL and mRNFL), ganglion cell layer (GCL), inner plexiform layer (IPL), and inner nuclear layer (INL).
    UNASSIGNED: The mean ages of the migraine patients and controls were 36.29 ± 9.45 and 36.45 ± 9.27 years, respectively. Thirty-four patients (89.48%) in both groups were female. The mean disability score was 19.63 ± 20.44 (indicating severe disability). The superior-outer INL of migraine patients were thicker than controls. Thickness of the GCL at temporal-outer sector and mRNFL at the superior-outer sector of the headache-side eyes was reduced. However, the INL of the headache-side-eye showed negative correlation with the disability score. This is the first study having found thinning of the GCL and mRNFL of the headache-side eyes. The INL was also thickened in migraines but showed negative correlation with the disability score.
    UNASSIGNED: Increased INL thickness in migraine patients may result from inflammation. The more severe cases with a high disability score might suffered progressive retinal neuronal loss, resulting in thinner INL than less severe cases.
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  • 文章类型: Journal Article
    本研究旨在通过数值研究选定因素对混凝土加铺层-桥面粘结强度的影响,直接和间接,采用非线性有限元分析(NLFEA)方法。此外,该研究介绍了获得足够的粘结强度以消除在不同应力作用下混凝土脱离的可能性所必需的准则。NLFEA已用于预测和关联混凝土覆盖层和桥面之间的界面区域的活荷载和诱导收缩应力。所产生的应力与覆盖层的直接拉伸粘结强度有关。经过适当验证后,共设计并检查了336个NLFEA模型。研究的参数如下:叠加降解水平(0%,19%,36%,51%,64%,和75%);覆盖层的相对厚度与桥面板的比率(toverlay/tslab);除了收缩引起的应力的年龄(早期年龄(3和7天)和中等年龄(14和28天)之外)。使用文献中的实验结果验证了NLFEA活荷载和收缩应力值,差异百分比小于5%。数值研究结果表明,混凝土覆盖层的厚度应在一定的覆盖层厚度范围内,以便能够在使用和过载条件下处理较低和较高的应力。在AASHTOHS-20卡车循环和冲击载荷的作用下,拟议的指南可以避免接口部件之间的不利分离。以及收缩负荷。
    This research paper intends to numerically investigate the impact of selected factors on the strength of the concrete overlay-bridge deck bond, directly and indirectly, using the nonlinear finite element analysis (NLFEA) method. Besides, the research introduces the guidelines necessary to attain adequate bond strength to eliminate the possibility of concrete detachment under the effect of different developed stresses. The NLFEA has been utilized in predicting and correlating the live applied loads and the induced shrinkage stresses at the interfacial region between the concrete overlay and the bridge deck. The developed stresses were related to the overlay\'s direct tensile bond strength. A total of 336 NLFEA models of overlay-bridge deck slab segments were designed and examined after being properly validated. The parameters of the study were as follows: the overlay degradation level (0 %, 19 %, 36 %, 51 %, 64 %, and 75 %); the ratio of the overlay\'s relative thickness-to-the bridge deck slab (toverlay/tslab); in addition to the age of the shrinkage induced stresses (early age (3 and 7 days) and moderate age (14 and 28 days)). The NLFEA live load and shrinkage stress values were validated using experimental results from the literature with difference percentages of less than 5 %. The numerical study results recommended that the thickness of the concrete\'s overlay should be within certain overlay thickness limits to be capable of handling the lower and higher stresses at the service and overloading conditions. The proposed guidelines enable the avoidance of unfavorable detachment between the interface parts under the effect of AASHTO HS-20 truck cyclic and impact loadings, as well as shrinkage loading.
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