Soil samples from 0–1050 cm depth were collected from a 20-year field experiment with two N fertilization treatments: 0 (N0) and 600 kg N ha −1 year −1 (N600). Amplicon sequencing and quantitative PCR analyses were performed to profile the vertical distribution of soil microbial communities and denitrification genes.The soil microbial community structure and diversity were strongly influenced by soil depth and N fertilization. The 250 cm depth was identified as a threshold depth, as dramatically different microbial communities were found below and above this depth.Quantitative PCR results showed that the absolute abundance of denitrification genes decreased with increasing soil depth.This study elucidated the profound effects of long-term N input on the composition and diversity of the microbial communities and the abundance of denitrifiers in the deep vadose zone. Our results provide basic information for use in mitigating nitrate leaching by enhancing microbial denitrification in deep vadose zones in intensive agricultural areas.
The portable energy dispersive X-ray fluorescence spectroscopy and laser Raman spectroscopy were used to scientifically analyze 75 typical jade artifacts unearthed from the Baojingwan site in Zhuhai. The material characteristics, making technique and cultural exchange of the jade artifacts were discussed. The jade artifacts analyzed are mainly ornaments such as jue, rings, earrings, ornaments, cores, cake shaped artifacts and geometric ornaments. Some stone tools such as ring stones and stone knives, as well as stone blanks and arrowheads are also comparatively analyzed. The jade ornaments unearthed from Baojingwan, Zhuhai are mainly jade rings, as well as a small number of rings, jue, ear pendants, cake shaped artifacts and geometric ornaments. The jade core is generally the raw materials left over from the making of rings, rings and ornaments, which are also used to make cakes, earrings and other artifacts. In terms of raw materials, the jade artifacts unearthed from Baojingwan site dated from the late Neolithic to the Bronze Age are mainly made of quartz (including crystal, agate, chalcedony, vein quartz and quartzite). There are also a few jade artifacts using serpentine, muscovite and rocks containing muscovite, quartz, calcite and other minerals. All the stone tools such as stone knives, stone arrowheads, ring stones and stone slabs are made by rocks. The making technology of jade artifacts in Baojing site mainly uses solid drills to drill holes on one side, but a few jade wares also use pipe drills to drill holes, which shows that the craftsmen in Baojing site have been able to use different drilling methods due to different characteristics of the products.
The text dataset of the military field is the basis for event extraction in military field, and high-quality data set can effectively promote the study of event extraction in this field，However, the event extraction data set commonly used in the real world (such as ACE2005, etc.) is oriented to the general field, and the text corpus resources on military events are scarce. Therefore, we collect a large amount of military news content from public military news websites; On the basis of text content analysis, we firstly establish an event model of military news that includes event types, entity types and entity relationship types. Secondly, the text data is manually labeled according to the event model, which is iteratively verified and corrected simultaneously. Finally, a dataset of 13,000 high-quality military news events with a full variety of labels was obtained. We make this military news event dataset publicly available in this paper. 军事领域的文本数据集是在军事领域进行事件抽取的基础，高质量的数据集可以有效地推动军事领域事件抽取的研究，然而现实世界中常用的事件抽取数据集（如ACE2005等）是面向通用领域的，关于军事领域事件的文本语料资源十分匮乏。因此，我们从公开军事新闻网站获取大量的军事新闻内容；在对新闻文本内容进行分析的基础上，首先建立包含事件类型、实体类型和实体关系类型的军事新闻事件模型；进而依据事件模型对文本数据进行人工标注，同时对事件模型进行迭代验证和修正；最终获得由13000条高质量军事新闻文本事件组成的标注种类全、质量高的军事新闻事件数据集。本研究公开了该军事新闻事件数据集。
The dataset of morphological traits of pierid based on Fauna Sinica is extracted by using a self-developed special tool for biological morphological feature marking after digitizing the related records of the book Fauna Sinicna (INSECTA Vol. 52 Lepidoptera Pieridae). This dataset contains 24 genera, 154 species of Pierididae (177 subspecies), Lepidoptera, Insecta. Each record in this dataset is the extraction of single morphological characteristics from morphology, measurement, and other morphological description data of different species/Subspecies in different genders and various developmental stages, mainly in shape, color, and texture. This dataset provides basic data for the biological research of these pierid groups, such as biogeography and phylogeny, and also provides valuable corpus resources for natural language processing and understanding research.
The dataset of morphological traits of birds based on Fauna Sinica is extracted by using special tools after digitizing the related records of the book Fauna Sinica (Aves 7). This dataset contains 85 species of birds belonging to 13 families of 5 orders recorded in the book, including Caprimulgiformes, Apodiformes, Trogoniformes, Coraciiformes, and Piciformes. Each record in this dataset is the extraction of single morphological characteristics from morphology, biology, distribution, measurement, and other morphological description data of different species/Subspecies in different genders and various developmental stages, mainly in shape, color, and texture. This dataset provides basic data for the biological research of these birds groups, such as biogeography and phylogeny, and also provides valuable corpus resources for natural language processing and understanding research.
Irrigation with saline water is increasingly popular for reclaiming saline-alkali soil and for increasing crop productivity in some countries and regions. The purpose of this study was to investigate the alteration of salt ions distribution within different soil aggregate fractions after irrigation with freezing saline water. The experimental site is located on the coastal plain in Haixing County, Hebei Province, China. In a field experiment after irrigation with freezing saline water for 6 years, soil samples (0-10, 10-20 and 20-30 cm depths) were collected from three treatments: freezing saline water irrigation with plastic film mulching (IM); freezing saline irrigation without plastic film mulching (IO); and no saline irrigation and no mulching (CK). The bulk soils were separated into five size classes (i.e., 5-8, 2-5, 1-2, 0.25-1 and <0.25 mm) by the dry-sieving method. Then, the salinity and ion (i.e., Ca2+, Mg2+, K+, Na+, HCO3-, SO42- and Cl-) concentrations within each aggregate size class were determined following the methods of Lao (1988). The total salt content was calculated as the sum of the cations and anions. 咸水灌溉可以作为一种改良盐碱地和提高作物生产力的技术越来越受重视。本研究旨在研究多年冰冻咸水灌溉后不同土壤团聚体组分中盐离子分布的变化。咸水结冰灌溉试验位于河北省沧州市中科院海兴盐碱地资源高效利用研究基地，研究开始于2008年，试验设对照CK（无灌溉无覆膜CK）、灌溉无覆膜（IO）、灌溉和覆膜（IM）三个处理，三次重复；小区面积40m2。冰冻咸水灌水量为180mm，灌水时气温-10.3℃；覆盖地膜于3月土壤表面冰层融化且入渗完成后。土样采集工作于2014年4月，每个小区分层取原状土壤，层次：0-10cm，10-20cm，20-30cm；在实验室分别测定土壤团聚体和含盐量。每个小区两个重复。土壤干团聚体的测定：采用干筛分法。土壤分级为5.0, 2.0, 1.0和 0.25 mm系列样品筛，每一粒级的土壤收集称重计算百分数。土壤含盐量的测定：采用土/水比1:5进行浸提，浸提液用化学滴定法测定，其中HCO3-含量用双指示剂滴定，Cl-含量用AgNO3滴定，SO42+含量用EDTA间接络合滴定，Ca2+和Mg2+含量用EDTA滴定，K+和Na+含量用阴阳离子平衡法求得，再以各阴阳离子的浓度之和求得总含盐量。
This is a bi-monthly export. CERD is a database of engineers from the Chinese Republican period (1912–1949). The digital analysis of historical registers has led to a prosopographic catalogue of persons, colleges, and workplaces. The data can be put in relation to one another by researchers to answer individual research questions. Citation recommendation: Pelzer, Thorben, et al., eds. (2021–2022). Chinese Engineers Relational Database (CERD) (Version 1.6.0). Zenodo. http://doi.org/10.5281/zenodo.4075601. Changelog: 1.6.0 (August 2022): Approx. 17,400 entries, completed sources, minor corrections, mergers, translations 1.5.0 (June 2022): Approx. 17,300 entries, added additional memberships 1.4.0 (April 2022): Approx. 16,800 entries, added additional sources, schooling 1.3.0 (February 2022): Approx. 16,500 entries, added documentation, additional memberships 1.2.0 (December 2021): Approx. 16,300 entries, added frequent CSV exports, source annotations, 5 missing minglu pages, additional association memberships 1.1.0 (October 2021): Approx. 15,700 entries, added selected association memberships 1.0.0 (August 2021): Approx. 15,400 entries [complete gongchengren minglu dataset milestone] 0.5.0 (June 2021): Approx. 13,000 entries 0.4.0 (April 2021): Approx. 10,500 entries 0.3.0 (February 2021): Approx. 7,500 entries, as well as various corrections, mergers, translations 0.2.0 (December 2020): Approx. 5,000 entries, as well as various corrections, mergers, translations 0.1.0 (October 2020): Early version with approx. 3,000 entries Online Access: Via Heurist: https://home.uni-leipzig.de/cerd/ Funded through the DFG (SFB 1199: "Processes of Spatialization under the Global Condition") and partly the BMBF ("The Pioneers of China's Rise to Technological Power: Technical Educational Institutions and Their Students in the Age of Global Transformation, 1860–1911").
Publisher: Editorial Office of Medical Journal of Peking Union Medical College Hospital
By reviewing and studying relevant historical materials, this study presents the advanced and fruitful clinical teaching in Peking Union Medical College Hospital(PUMCH) nearly a hundred years ago. It proved that the clinical teaching of PUMCH had reached the internationally advanced level in 1925. The bed-side teaching, case discussion, multidisciplinary joint ward round, interdisciplinary teaching, and resident training system still have practical significance presently. As it turns out, many of the teachers who were passionate about teaching and students who were actively involved in teaching went on to become medical masters. The spirit of taking teaching as an honor, responsibility and mission has been passed on and deeply rooted in the spirit of PUMCH and has remained unchanged for a century.