放射影像技术在小儿气管、支气管异物诊断中的应用分析

探究小儿气管、支气管异物诊断过程中采取放射影像技术的应用价值。方法 选择我院放射科近一年(2022年9月至2023年8月)需要诊断气管、支气管异物患儿予以研究,按照放射影像技术的不同予以分组,将其分成以X线片诊断为主的参照组(n=42),以多排螺旋CT检查为主的探究组(n=42),比较两组患儿异物检出率、异物征象检出率、图像质量优良率、检查时间以及满意度。结果 应用多排螺旋CT检查的探究组异物、异物征象检出率、图像质量优良率、检查满意度均优于参照组(P<0.05)。结论 气管、支气管异物患儿临床采取多层螺旋CT检查的应用价值较高,该放射影像技术具有准确率高、检查时间短、图像质量优良率高的优点,值得推广。

眼内异物54例临床分析

跟外伤是视力丧失的主要原因之一.尤其是合并眼内异物的复杂眼球穿孔伤,其各种并发症往往对患者伤眼视功能造成继发影响.因此,对复杂眼外伤的预防和及时正确的处理就显得非常重要.

梳针分梳板对杂质去除的影响

为研究梳针分梳板对去除生条中杂质的影响,用USTER AFIS单纤维测试仪对梳棉机刺辊下加装梳针分梳板、锯齿分梳板和采用小漏底在不同隔距、刺辊速度、道夫速度条件下所加工的生条进行杂质检测。结果显示:梳针分梳板去除杂质能力不如锯齿分梳板,梳棉机刺辊下采用加装小漏底比加装梳针和锯齿分梳板更有利于杂质的去除;锯齿分梳板所加工生条的异物率(VFM)要好于梳针分梳板,小漏底方案比梳针和锯齿分梳板方案都好;梳针分梳板所加工生条的杂质平均直径略大于锯齿分梳板,小漏底所加工生条的杂质平均直径比分梳板大。

梳棉锡林速度对杂质去除效果的影响

研究梳棉机锡林速度变化对生条、头并条子、二并条子中杂质的影响。用AFIS单纤维测试系统对不同锡林速度条件下的生条、头并条子、二并条子中的杂质进行检测。结果显示,随着锡林速度的提高,生条中杂质数量随之降低;头道并条在锡林速度为296 r/min和350 r/min时,杂质总数接近,在锡林速度为394 r/min和450 r/min时随着锡林速度的提高杂质数量随之下降;二道并条的杂质也随锡林速度的提高而下降;牵伸过程可能造成的杂质进一步破碎会导致头道条子杂质数量相对增加。指出:合理配置锡林速度对减少成纱棉结杂质非常关键。

USTER AFIS 杂质参数测试结果稳定性的研究

研究了USTERAFIS杂质参数测试稳定次数的问题，对8次实验313个不同工艺实验方案中生条的杂质参数的测试结果进行了CV％值分析，用统计学理论对部分实验结果进行了测试稳定次数的估算，得出了有关参数测试的稳定次数的估值大小。认为用AFIS杂质模块进行杂质测试时，采用10次测试是不准确的。其原因在于AFIS所取样品容量太低、杂质本身分布不均匀及实验取样过程中杂质的损失。

Modeling Strain Rate Effect for Heterogeneous Brittle Materials

Rocks are heterogeneous from the point of dynamic failure behavior. Both the compressive and microstructure which is of significance to their tensile strength of rock-like materials is regarded different from the static strength. The present study adopts smoothed particle hydrodynamics （SPH） which is a virtual particle based meshfree method to investigate strain rate effect for heterogeneous brittle materials. The SPH method is capable of simulating rock fracture, free of the mesh constraint of the traditional FEM and FDM models. A pressure dependent J-H constitutive model involving heterogeneity is employed in the numerical modeling. The results show the compressive strength increases with the increase of strain rate as well as the tensile strength, which is important to the engineering design.

Tuning Exchange Anisotropy of Exchange-Biased System

Exchange anisotropy in FM/AFM bilayers has given a lot of static magnetization properties such as enhanced coercivity and magnetization loop shifts. These phenomena are primarily from the effective anisotropies introduced into a ferromagnet by exchange coupling with a strongly anisotropic antiferromagnet. These effective anisotropies can also be used to explain the dynamic consequences of exchange-biased bilayers. In this article, the dynamic consequences such as exchange-induced susceptibility, exchange-induced permeability, and the corresponding domain wall characteristics in the exchange-biased structures of ferromagnet/antiferromagnetl/antiferromagnet2 are studied. The results show that the second antiferromagnetic layer can largely affect the dynamic consequences of exchange-blazed bilayers. Especially in the case of critical temperature, the effects become more obvious. Practically, the exchange anisotropy of biased bilayer system can be tuned by exchange coupling with the second antiferromagnetic layer.

放射影像技术在小儿气管支气管异物诊断中的应用效果

影像学检查对儿童气管、支气管异物的诊断价值。方法 本研究选取2020年5月到2023年5月间收治的100名小儿气管支气管异物,将患者分成两组,即观察组和对照组:对照组50例,行普通 X线片扫描,观察组50例行螺旋 CT扫描。对两组儿童异物检出率及异常征检出率进行对比分析。结果 结果显示,观察组与对照组相比,异物检出率优于对照组,且有显著性差异。(P<0.05);两组患者肺气肿、肺炎、支气管阻塞和纵隔位置改变等异物征象等各项指标比较,观察组优于对照组,有显著性差异。(P<0.05)。结论 应用螺旋 CT成像能显著提高儿童气管、支气管异物的检出率,更清晰地显示异物征象,临床效果满意,值得推广。

Theoretical Study on the Stable Structures and Aromaticities for Pnictogen Dianionic Sb4^2-, Bi4^2-, and （SbBi）2^2- Clusters

Through the theoretical calculation of structural optimization, vibrational frequencies and atomization energies with one method of density functional theory （B3LYP） and two post- Hartree-Fock approaches （MP2, CCSD（T））, several stable isomers for new three pnictogen dianionic Sb4^2-, Bi4^2-, and （SbBi）2^2- species were determined. For two homoatomic Sb4^2- and Bi4^2- species, there are three stable isomers： square （D4h）, roof-shaped （C2v-1）, and C2v-2 structure with the square isomer being the ground state. For the heteroatomic dian- ionic （SbBi）2^2- species, there are also three stable isomers： rhombus （D2h）, roof-shaped （C1）, and C2v structures with the rhombic isomer being the ground state. The calculated NICS values show that nucleus-independent chemical shifts （NICS） values of roof-shaped isomers for Sb4^2-, Bi4^2-, and （SbBi）2^2- species are all negative, consequently indicating that these roof-shaped isomers possess aromaticities. NICS values for the planar ring isomers are all positive, suggesting that these three planar ring isomers have antiaromatic characters. The aromaticity for the two stable roof-shaped and square isomers are preliminarily explained and discussed with MO analysis.

A new identification method for five species of oysters in genus Crassostrea from China based on high-resolution melting analysis

The high phenotypic plasticity in the shell of oysters presents a challenge during taxonomic and phylogenetie studies of these economically important bivalves. However, because DNA can exhibit marked differences among morphologically similar species, DNA barcoding offers a potential means for oyster identification. We analyzed the complete sequences of the cytochrome oxidase subunit I （COI） of five common Crassostrea species in China （including Hong Kong oyster C. hongkongensis, Jinjiang oyster C. ariakensis, Portuguese oyster C. angulata, Kumamoto oyster C. sikamea, and Pacific oyster C. gigas） and screened for distinct fragments. Using these distinct fragments on a high-resolution melting analysis platform, we developed an identification method that does not rely on species-specific PCR or fragment length polymorphism and is efficient, reliable, and easy to visualize. Using a single pair of primers （Oyster- COI-1）, we were able to successfully distinguish among the five oyster species. This new method provides a simple and powerful tool for the identification of oyster species.