Magnetoacoustic Wave Scattering and Dynamic Stress Concentration around the Elliptical Opening in Exponential-Gradient Piezomagnetic Materials

Based on the theory of magnetoacoustic coupled dynamics, the purpose of this paper is to evaluate the dynamic stress concentration near an elliptical opening in exponential-gradient piezomagnetic materials under the action of antiplane shear waves. By the wave function expansion, the solutions for the acoustic wave fields and magnetic fields can be obtained. Stress analysis is performed by the complex function method and the conformal mapping method, which are used to solve the boundary conditions problem, and is used to express the dynamic stress concentration coefficient (DSCC) theoretically. As cases, numerical results of DSCCs are plotted and discussed with different incident wave numbers and material parameters by numerical simulation. Compared with circular openings, elliptical openings are widely used in material processing techniques and are more difficult to solve. Numerical results show that the dynamic stress concentration coefficient at the elliptical opening is strongly dependent on various parameters, which indicates that the elliptical opening is more likely to cause crack and damage to exponential-gradient piezomagnetic materials.     

Pattern recognition using transabdominal ultrasound to diagnose ovarian mature cystic teratoma

Objective

To determine the validity of sonographic pattern recognition in the diagnosis of mature cystic teratoma.

Methods

Consecutive patients scheduled for elective surgery for adnexal masses were included in the study. All patients underwent transabdominal ultrasound with color extended-flow mapping within 24 hours prior to surgery. Examinations were performed by the same sonographer to identify benign cystic teratoma. The final diagnoses were based on histopathologic findings.

Results

A total of 329 consecutive patients were recruited; 23 were excluded because the masses were not adnexal masses. Of the remaining 306 patients, 36 masses were found to be mature cystic teratomas and 270 were nonteratomas. Sonographic pattern recognition showed a sensitivity of 94.4% and a specificity of 98.2%.

Conclusion

Sonographic pattern recognition using transabdominal ultrasound with color extended-flow mapping can accurately diagnose mature cystic teratoma.     

Accuracy and correlates of maternal recall of birthweight and gestational age

Objective  To determine the accuracy of maternal recall of children birthweight (BW) and gestational age (GA), using the Danish Medical Birth Register (DBR) as reference and to examine the reliability of recalled BW and its potential correlates.
Design  Comparison of data from the DBR and the European Youth Heart Study (EYHS).
Setting  Schools in Odense, Denmark.
Population  A total of 1271 and 678 mothers of school children participated with information in the accuracy studies of BW and GA, respectively. The reliability sample of BW was composed of 359 women.
Method  The agreement between the two sources was evaluated by mean differences (MD), intraclass correlation coefficient (ICC) and Bland–Altman's plots. The misclassification of the various BW and GA categories were also estimated.
Main outcome measures  Differences between recalled and registered BW and GA.
Results  There was high agreement between recalled and registered BW (MD =−0.2 g; ICC = 0.94) and GA (MD = 0.3 weeks; ICC = 0.76). Only 1.6% of BW would have been misclassified into low, normal or high BW and 16.5% of GA would have been misclassified into preterm, term or post-term based on maternal recall. The logistic regression revealed that the most important variables in the discordance between recalled and registered BW were ethnicity and parity. Maternal recall of BW was highly reliable (MD =−5.5 g; ICC = 0.93), and reliability remained high across subgroups.
Conclusion  Maternal recall of BW and GA seems to be sufficiently accurate for clinical and epidemiological use.     

近红外发光葡聚糖纳米胶活体成像小鼠淋巴结

 目的  制备和研究荧光染料标记的葡聚糖纳米胶,用于活体荧光成像小鼠腋窝淋巴结。方法  使用脱氧胆酸和荧光染料Cy7化学标记葡聚糖,通过透析法制备纳米胶Dextran-Cy7;使用透射电子显微镜、动态光散射仪分别表征纳米胶的形貌及大小;分光光度法标定Cy7的含量;用C57小鼠和DC2.4细胞分别评价Dextran-Cy7的体内、体外毒性;对10只正常昆明小白鼠经前掌注射Dextran-Cy7生理盐溶液,使用活体荧光扫描成像系统观察小鼠腋窝淋巴结的成像效果;淋巴结免疫荧光组化法观察Dextran-Cy7在淋巴结内的分布。结果  Dextran-Cy7纳米胶是直径30~50 nm的球形纳米颗粒,其在体内和体外都具有较低的细胞毒性,可作为近红外发光探针活体荧光成像小鼠腋窝淋巴结;纳米胶主要分布在淋巴结的巨噬细胞细胞内。结论  Dextran-Cy7纳米胶细胞毒性低、生物相容性好,可作为纳米荧光探针成像活体小鼠淋巴结。     

国外术语服务系统发展现状研究

术语标准化建设是资源知识组织与服务的基础。为了充分了解国外术语服务系统的建设与发展现状,调研国外有代表性的29个术语服务系统,从创建机构、类型及服务对象、服务内容、服务方式、内容组织等方面分析国外术语服务系统的发展现状,总结对于国内术语服务系统建设的启示。     

CM学习策略结合PBL在成人护理学中的应用研究

目的：探讨概念图学习策略结合以问题为基础的学习在成人护理学中应用的效果。方法：实验组62人采用概念图学习策略结合以问题为基础的学习方法,对照组56人采用以问题为基础的学习方法。结果：干预后比较,实验组较对照组自主学习能力总分明显提高,差异有统计学意义（P〈0.05）;实验组学生对该方法总体持肯定态度。结论：概念图学习策略结合以问题为基础的学习有利于提高学生自主学习能力。     

北京市公立医院综合改革对医疗机构技术劳务收入的影响分析

目的:分析北京市医药分开和医耗联动综合改革对不同级别医疗机构体现医务人员技术劳务价值收入部分的影响。方法:利用参与北京市医药分开和医耗联动综合改革363家公立医疗机构2016年1月—2019年12月的监测数据,采用描述性分析结合多重间断时间序列模型,对改革前后不同级别医疗机构技术劳务收入及其占比的变化情况进行分析。结果:医药分开综合改革实施后,三级医院、二级医院、一级医院及社区的技术劳务收入较改革前分别增长了105.4%、119.7%和318.3%,其占比分别增长了5.91、6.44和5.87个百分点;医耗联动综合改革实施后,三级医院、二级医院、一级医院及社区技术劳务收入较改革前分别增长了26.2%、18.3%和11.6%,其占比分别增长了2.31、2.03和0.84个百分点。结论:北京市两项公立医院综合改革的实施有效促进了各级别医疗机构技术劳务收入的增长,医疗费用结构得到优化。建议进一步建立科学合理的医疗服务价格定价及动态调整机制,加强对基层医疗机构的重视,健全医疗服务行为监管体系。     

基于CiteSpace国内婴儿哭声研究领域的知识图谱分析

目的 分析国内婴儿哭声研究领域的现状,探索该领域国内研究热点,旨在为婴儿哭声领域科研工作提供一定思路和依据。方法 检索CNKI建库至2021年12月期间所收录的婴儿哭声相关研究文献,运用CiteSpace软件对纳入文献从发文量、作者、机构、关键词、突现5个方面进行可视化分析。结果 共纳入190篇文献,1980—2021年间该领域发文量整体呈上升趋势;研究作者较少,作者间合作网络尚未形成;研究机构之间交互性差,发文量最多的是杭州医学院及其附属医院;“护理干预”、“哭声信息识别”、“深度学习”为该领域研究热点;“护理”、“新生儿”、“婴儿哭声”、“深度学习”为该领域研究前沿;研究趋势由新生儿病理性哭声研究转向婴儿哭声针对性干预、深度学习。结论 国内婴儿哭声领域受到更多重视,未来应强化作者和机构间的合作交流,融合多学科发展,扩大研究范围,可从婴儿情感需求分析、智能医学与监护、新型护理干预方法等方面着手,加速国内婴儿哭声研究进程。     

Point-of-care hepatitis C screening with direct access referral to improve linkage to care among halfway house residents: a pilot randomised study

INTRODUCTIONLinkage to care among individuals with substance misuse remains a barrier to the elimination of the hepatitis C virus (HCV). We aimed to determine whether point-of-care (PoC) education, screening and staging for liver disease with direct access to hospitals would improve linkage to care among this group.METHODSAll participants were offered PoC education and HCV screening. HCV-positive participants were randomised to standard care (controls) or direct access, which provided a direct pathway to hospitals. Linkage to care was determined by reviewing electronic medical records. Linkage of care cascade was defined as attendance at the specialist clinic, confirmation of viraemia by HCV RNA testing, discussion about HCV treatment and initiation of treatment.RESULTS351 halfway house residents were screened. The overall HCV prevalence was 30.5% (n = 107), with 69 residents in the control group and 38 in the direct access group. The direct access group had a significantly higher percentage of cases linked to specialist review for confirmatory RNA testing (63.2% vs. 40.6%, p = 0.025), HCV treatment discussion (p = 0.009) and treatment initiation (p = 0.01) compared to the controls. Overall, only 12.6% (n = 13) had treatment initiation during follow-up. PoC HCV screening with direct access referral had significantly higher linkage to HCV treatment initiation (adjusted odds ratio 9.13, p = 0.005) in multivariate analysis.CONCLUSIONPoC HCV screening with direct access improves linkage to care and simplifies the HCV care cascade, leading to improved treatment uptake. PoC education, screening, diagnosis and treatment may be an effective strategy to achieving HCV micro-elimination in this population.