关键词： RDF   Multi-dimensional meta-knowledge   Provenance   Semantic web   Web of data  

摘要： The Web of Data needs additional information, i.e., meta-knowledge to ensure quality and build the trust in data. For representing meta-knowledge, there exist various approaches in the literature, for example, RDFt, tRDF, RDF Reification, Singleton Property and Named Graph. There are various issues associated with these approaches in representing the meta-knowledge, for example, the increasing graph size, additional statement generation, the representation of multi-dimensional and/or nested meta-knowledge, among others. In this work, we propose an approach called RDFM to represent, store, and manage meta-knowledge. RDFM integrates attributes to the predicate to represent nested and/or multi-dimensional meta-knowledge with lesser statements generation. A query language called SPARQLM is developed to extract RDFM data. The study analyzes the performance of RDFM in terms of the number of edges, number of statements generation, data redundancy, storage, query response time, required query length, representation of meta-knowledge in nested and different dimensions. The results show that the RDFM model performs significantly and gives advantage over storage management and graph data management.

摘要： Gastrointestinal follicular lymphoma (FL) is a rare, but distinct extra-nodal variant of non-Hodgkin's lymphoma. Its incidence has grown outside of known genetic inheritance, due to epigenetic mutations from increased toxic exposure to benzene and pesticides, expanded life spans, and widespread standardized screening efforts. Diagnosis is by colonoscopy-obtained tissue staining and can be missed if alternative CRC screening methods are used in lieu.

关键词： 电磁辐射   电缆屏蔽   故障分析  

摘要： 针对某型飞机短波电台发射过程中干扰机上其他系统工作的故障,分析原因并排除故障,总结此类故障的排故方法和措施,以提高排故效率。

关键词： 玉米浆   苏打盐碱土   改良效果   腐殖质组成   胡敏酸结构  

摘要： 为研究玉米浆(CSL)及其与不同有机物料混合对苏打盐碱土的改良效果及腐殖质特性变化,本文以松原市苏打盐碱土为研究对象,设置对照组(CK)、1/2倍用量玉米浆(1/2CSL)、1倍量玉米浆(CSL)、2倍量玉米浆(2CSL)、1/2倍用量玉米浆与秸秆混合(1/2CSL+C)、1/2倍用量玉米浆与生物质炭混合(1/2CSL+B)和1/2倍用量玉米浆与泥炭混合(1/2CSL+P)7个处理,研究了其对苏打盐碱土的改良效果及腐殖质组成和胡敏酸(HA)结构特征的变化。每个处理3次重复。结果表明:与CK相比,除2CSL,各玉米产量均增加,增长比率为66.67%~193.65%,各处理pH、全盐量的降低比率分别为9.80%~11.09%、12.2%~44.3%,碱化度降低12.67~26.53个百分点。1/2CSL处理的有机碳含量增加了46.19%,HA和胡敏素(HM)分别增加了48.59%和47.32%,I2920/I1720增加了156.3%,H/C增加了25.96%,(O+S)/C降低了30.68%,放热量高温值/中温值降低了48.6%,质量损失量高温值/中温值降低了14.2%。说明有机物料的施入使土壤HA结构的脂族性增强,氧化度、缩合度和热稳定性降低,结构趋于年轻化,其中1/2CSL处理效果最好。

关键词： acquired immunodeficiency syndrome   antiretroviral therapy   birth outcome   human immunodeficiency virus   pregnancy  

摘要： Objective: To evaluate time trends in pregnancies and pregnancy outcomes among women with HIV in Europe. Design: European multicentre prospective cohort study. Methods: EuroSIDA has collected annual cross-sectional audits of pregnancies between 1996 and 2015. Pregnancy data were extracted and described. Odds of pregnancy were modelled, adjusting for potential confounders using logistic regression with generalized estimating equations. Results: Of 5535 women aged 16 to <50 years, 4217 (76.2%) had pregnancy information available, and 912 (21.6%) reported 1315 pregnancies. The proportions with at least one pregnancy were 28.1% (321/1143) in East, 24.5% (146/596) in North, 19.8% (140/706) in West/Central, 19.3% (110/569) in Central East and 16.2% (195/1203) in South Europe. Overall 319 pregnancies (24.3%) occurred in 1996-2002, 576 (43.8%) in 2003-2009 and 420 (31.9%) in 2010-2015. After adjustment, the odds of pregnancy were lower in 1996-2002, in South, Central East and East compared to West/Central Europe, in older women, those with low CD4(+) cell count or with prior AIDS, and higher in those with a previous pregnancy or who were hepatitis C virus positive. Outcomes were reported for 999 pregnancies in 1996-2014, with 690 live births (69.1%), seven stillbirths (0.7%), 103 spontaneous (10.3%) and 199 medical abortions (19.9%). Conclusions: Around 20% of women in EuroSIDA reported a pregnancy, with most pregnancies after 2002, when more effective antiretroviral therapy became available. Substantial differences were seen between European regions. Further surveillance of pregnancies and outcomes among women living with HIV is warranted to ensure equal access to care.

关键词： Botswana   HIV infections   HIV seropositivity   HIV testing   risk factors  

摘要： Objective: We used data from a routine HIV testing program to develop risk scores to identify patients with undiagnosed HIV infection while reducing the number of total tests performed. Design: Multivariate logistic regression. Methods: We included demographic factors from HIV testing data collected in 134 Botswana Ministry of Health & Wellness facilities during two periods (1 October 2018- 19 August 2019 and 1 December 2019 to 30 March 2020). In period 2, the program collected additional demographic and risk factors. We randomly split each period into prediction/validation datasets and used multivariate logistic regression to identify factors associated with positivity;factors with adjusted odds ratios at least 1.5 were included in the risk score with weights equal to their coefficient. We applied a range of risk score cutoffs to validation datasets to determine tests averted, test positivity, positives missed, and costs averted. Results: In period 1, three factors were significantly associated with HIV positivity (coefficients range 0.44-0.87). In period 2, 12 such factors were identified (coefficients range 0.44-1.37). In period 1, application of risk score cutoff at least 1.0 would result in 50% fewer tests performed and capture 61% of positives. In period 2, a cutoff at least 1.0 would result in 13% fewer tests and capture 96% of positives;a cutoff at least 2.0 would result in 40% fewer tests and capture 83% of positives. Costs averted ranged from 12.1 to 52.3%. Conclusion: Botswana's testing program could decrease testing volume but may delay diagnosis of some positive patients. Whether this trade-off is worthwhile depends on operational considerations, impact of testing volume on program costs, and implications of delayed diagnoses.

关键词： Fe3Al alloy   sliding wear   wear mechanism   hardening effect   scraper conveyor   third bodies  

摘要： This work reports on the sliding wear properties of Fe3Al-based alloy in conditions of dry sliding and quartz sand abrasion. The wear strengthening mechanism is also analyzed in detail. On this basis, the feasibility of using Fe3Al-based alloy instead of 42CrMo steel to make the wear-resistant scraper components in scraper conveyor is discussed. The results show that the wear mass loss and wear-rate of Fe3Al-based alloy are significantly lower than 42CrMo steel in dry sliding wear and abrasion by quartz sand, which indicates good sliding wear resistance. The wear resistance of Fe3Al-based alloy can be attributed to the grain boundary strengthening caused by the carbide precipates, dislocation fine-grained strengthening, and hard phase strengthening of Al2O3 in the wear surface. Compared with quenched and tempered 40CrMo steel, the lower density of Fe3Al-based alloy can reduce the weight of scraper components by about 15%, and the lower matrix hardness can reduce the wear loss of middle groove and scraper chain. The hardening effect of the worn surface layer can effectively improve the sliding wear resistance of the scraper by about 68%, which is very beneficial to improve the service life and reliability of the scraper conveyor.

关键词： antidepressant therapy   care cascade   depression   depressive symptoms   viral nonsuppression  

摘要： Objective: The aim of this study was to describe the risk of viral nonsuppression across the depression care cascade. Design: A clinical cohort study. Methods: We used depressive symptoms (PHQ-8 >= 10) self-reported on computer-assisted surveys, clinical diagnoses of depression in the medical record in the prior year and pharmacologic (any prescription for an antidepressant) and psychologic treatments for depression (attendance at at least two mental health visits in the prior year) to classify patients into groups: no history of depression;prior depression diagnosis;current indication for depression treatment (symptoms or clinical diagnosis);and treated depression (stratified by presence of persistent symptoms). We associated position in the depression care cascade with viral nonsuppression (>200 copies/ml) 7 days before to 6 months after the index self-report of depressive symptoms. Results: History of depression [adjusted risk difference (aRD) relative to no history = 5.9%, 95% confidence interval (95% CI): 1.5-10.3] and current depression (symptoms or diagnosis) in the absence of treatment (aRD relative to no current depression or depression treatment = 4.8%, 95% CI: 1.8-7.8) were associated with a higher risk of viral nonsuppression than no history of depression. Depression treatment mitigated this association (aRD = -0.4%, 95% CI: -2.5 to 1.7). Conclusion: The relationship between depression care cascade and viral suppression is complex. Untreated depression and clinically unrecognized depressive symptoms were both related to viral nonsuppression. Treated depression was not associated with viral nonsuppression;however, a high proportion of treated patients still had depressive symptoms. Depression treatment should be titrated if patients' symptoms are not responsive and patients with a history of depression should be monitored for ART adherence.

关键词： 山东抗日根据地   救国公粮   合理负担   累进税  

摘要： 山东抗日根据地是华北抗日根据地中相对较晚征收救国公粮的地区。山东抗日根据地初创时期,各抗日军队就地筹粮,军粮主要靠没收汉奸财产、募捐和摊派自行解决。1940年山东根据地发布《公平负担暂行办法》,对各阶层以累进的方式征收救国公粮。此后,为了达到各阶层的公平负担,针对实践中发现的问题,对救国公粮的征收办法不断进行修正,从1942年的"征粮新办法",到1943年"征粮暂行办法",最后汇集为1945年的《山东省征收公粮条例》。与华北其他抗日根据地相比,山东根据地救国公粮征收的区域差异较大,胶东、滨海、清河、鲁中、鲁南等地区各有特点。总体上看,山东根据地救国公粮征收在吸收华北其他根据地的经验后,逐渐形成了自己的特色。