学科服务 更多>>

关键词： 动物检疫   食品安全   作用  

摘要： 饲料食品添加剂和动物性药品的滥用是造成动物疫情、动物性食品安全问题的主要原因,对人类健康和动物饲料生产、出口造成严重影响,必须高度重视动物的检测和检疫,以确保食品安全。本文结合我国实际情况,分析总结动物食物安全的现状和影响动物食物安全的其他重要因素,论述动物食品检验和检疫对动物性食品安全的作用和重要性。

关键词： Land cover classification   Sentinel   Google Earth Engine   Big data   Remote sensing   Iran  

摘要： Accurate information about the location, extent, and type of Land Cover (LC) is essential for various applications. The only recent available country-wide LC map of Iran was generated in 2016 by the Iranian Space Agency (ISA) using Moderate Resolution Imaging Spectroradiometer (MODIS) images with a considerably low accuracy. Therefore, the production of an up-to-date and accurate Iran-wide LC map using the most recent remote sensing, machine learning, and big data processing algorithms is required. Moreover, it is important to develop an efficient method for automatic LC generation for various time periods without the need to collect additional ground truth data from this immense country. Therefore, this study was conducted to fulfill two objectives. First, an improved Iranian LC map with 13 LC classes and a spatial resolution of 10 m was produced using multi-temporal synergy of Sentinel-1 and Sentinel-2 satellite datasets applied to an object-based Random forest (RF) algorithm. For this purpose, 2,869 Sentinel-1 and 11,994 Sentinel-2 scenes acquired in 2017 were processed and classified within the Google Earth Engine (GEE) cloud computing platform allowing big geospatial data analysis. The Overall Accuracy (OA) and Kappa Coefficient (KC) of the final Iran-wide LC map for 2017 was 95.6% and 0.95, respectively, indicating the considerable potential of the proposed big data processing method. Second, an efficient automatic method was developed based on Sentinel-2 images to migrate ground truth samples from a reference year to automatically generate an LC map for any target year. The OA and KC for the LC map produced for the target year 2019 were 91.35% and 0.91, respectively, demonstrating the efficiency of the proposed method for automatic LC mapping. Based on the obtained accuracies, this method can potentially be applied to other regions of interest for LC mapping without the need for ground truth data from the target year.

关键词： Generalized zero shot classification   Generative adversarial network   Class consistency   Semantic consistency  

摘要： Generalized zero shot classification aims to recognize both seen and unseen samples in test sets, which has gained great attention. Recently, many works consider using generative adversarial network to generate unseen samples for solving generalized zero shot classification problem. In this paper, we study how to generate discriminative and meaningful samples. We propose a method to learn discriminative and meaningful samples for generalized zero shot classification tasks (LDMS) by generative adversarial network with the regularization of class consistency and semantic consistency. In order to make the generated samples discriminative, class consistency is used, such that the generated samples of the same classes are near and of different classes are far away. In order to make the generated samples meaningful, semantic consistency is used, such that the semantic representations of the generated samples are close to their class prototypes. It encodes the discriminative information and semantic information to the generator. In order to alleviate the bias problem, we select some confident unseen samples. We use the seen samples, the generated unseen samples and the selected confident unseen samples to train the final classifier. Extensive experiments on all datasets demonstrate that the proposed method can outperform state-of-the-art models on generalized zero shot classification tasks.

关键词： galaxies   active galactic nuclei   radio galaxies   spectral classification  

摘要： This is a detailed spectral classification of 96 active galaxies from the Veron-Cetty and Veron catalog (2010, Version 13, VCV-13) of active galaxies and quasars. These objects were identified as radio sources using standard radio catalogs. Those galaxies which had radio sources in at least 6 different radio bands and had been identified spectrally in the SDSS catalog were selected. The types of activity of these were determined using their SDSS spectra. Three diagnostic diagrams and a direct study of the spectra were used for more certain classification. As a result, the classifications of 85% of the objects were changed. The radio sources in different radio bands make it possible to construct the spectral distribution of the energy in the radio range and to compare it with the optical activity types.

关键词： Human hair   Label-free   Proteomics   Geometric   Racial   Biomarkers  

摘要： Differences in the physiological proteome of men of different racial origin is poorly researched, albeit hair is mostly composed of keratins and keratin-associated proteins. Hence, we have carried out label-free, shotgun proteomics analysis on hair samples collected from black African, Caucasian, Asian, and Mixed-Ancestry donors within a heterogeneous population of the Western Cape of South Africa. Further, the same hair was also classified using geometrical measurements. Using both qualitative and quantitative proteomics bioinformatics pipelines, we identified over 450 protein groups (FDR = 0.01). Identified protein classes included keratins, keratin-associated proteins, histone proteins and desmosomes, inter alia. No protein by quantitative proteomic analyses significantly differentiated racial or geometric groups in our cohort. Functional pathway analysis of top-ranking proteins showed enrichment for skin, epidermal and tissue development, as well as intermediate-filament organization. Racial classification is a social construct, and attributing differences in a biologic endpoint to it is both imprecise and valueless in the era of precision medicine. Nonetheless, clarity on the physiological hair proteome could serve as a foundation for using hair proteomics for disease biomarker and targeted therapy identification for precision medicine. For the first time, we established the physiological hair proteome of individuals in a culturally diverse cohort from Africa. Significance: For the first time we have been able to characterize the physiological human hair proteome in a culturally diverse South African cohort. We have also identified that proteomics differences were not observed in individual hair samples using our quantitative proteomics bioinformatics pipeline. This outcome supports a widely known notion that DNA sequence comparison often shows that people on each continent are not more genetically similar to one another than to people who come from other conti

摘要： Research Findings: This study examined the relation between classroom behavioral composition and teacher-child interactions in preschool classrooms and the potential for teachers' experience, education level, and area of study to buffer against the challenges of teaching in classrooms with high levels of disruptive behaviors. Classroom behavioral composition was operationalized in two ways (classroom mean and classroom proportion of children at or above 90th percentile) using teacher reports of children's disruptive behaviors. Results indicated that the proportion of children at or above the 90th percentile was linked to a decline in the quality of teacher-child interactions in classroom organization and instructional support across the year. Marginally significant interaction effects suggested that holding a bachelor's degree may be a protective factor for teachers' emotional support quality at the beginning of the year, but more years of teaching experience seemed to worsen the negative effect of challenging classroom behavioral composition on the quality of emotional interactions over the course of the school year. Practice or Policy: The quality of preschool teachers' practice showed declines across the year when teachers perceived very disruptive behaviors in the classroom. The results of this study have implications for preservice training, teacher professional development, and quality rating and improvement systems focused on teacher-child interactions.

关键词： 基础输液   分类方法   编码   调查问卷  

摘要： 目前基础输液包装系统缺乏明确的分类标准及分类规则,本研究从容器材质、结构、接口形式、组合盖及外袋性质5个方面对基础输液包装系统进行综合定义,拟建立一种基于编码模式的分类方法;并通过调查问卷的形式对7家基础输液生产企业相关产品信息进行调查,以验证该分类方法能够全面有效地涵盖现有基础输液包装系统,且具备一定的指导性与扩展性,以期能为基础输液包材领域的进一步研究提供便利,同时为临床使用和医疗保险等药政管理提供依据。

关键词： 粮油检验   食品安全   安全监督  

摘要： 在食品科学以及营养学日渐普及的时代背景下,人民群众开始关注粮油食品的安全问题。本文首先对粮油检验监督概念进行了简单说明,然后分析了粮油检验监督在食品安全中的作用。

关键词： 感染性疾病   微生物检验   感染控制   作用效果  

摘要： 目的探讨基于微生物检验进行感染控制的临床效果。方法择取2018年1月至2018年12月我院750例感染性疾病患者,分为实验组(根据微生物检验结果予以针对性抗菌治疗,375例)和对照组(经验性用药抗菌药物,375例),统计实验组微生物检验结果,观察两组疗效。结果实验组痰培养阳性314例,阳性率83.73%,共计分离菌株316株。实验组治疗总有效率(99.47%)高于对照组(82.13%),差异有统计学意义(P<0.05)。结论微生物检验能够有效明确感染致病菌种类及药物敏感情况,为抗菌药物合理使用提供依据和指导。

关键词： 质量检验   市场监管   检验方式  

摘要： 随着我国经济的飞速发展,人们的生活质量有了根本性的提高,商品得到了极大的丰富但同时商品质量问题也变得尤为重要,商品质量关系到一个国家经济的发展与社会的繁荣稳定,计量器具的检验切实的关系到百姓的民生与安定,是国家维持市场经济繁荣与健康发展的重要方式,本文以此背景出发,探讨了当前计量器具制造与检验的意义与重要性,进而分析了当下开展产品生产质量监管的具体措施,希望能够给予读者一定的参考价值。