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Clinical significance of type V_I pit pattern subclassification in determining the depth of invasion of colorectal neoplasms 被引量:17
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作者 Hiroyuki Kanao Shinji Tanaka +5 位作者 Shiro Oka Iwao Kaneko Shigeto Yoshida Koji Arihiro Masaharu Yoshihara Kazuaki Chayama 《World Journal of Gastroenterology》 SCIE CAS CSCD 2008年第2期211-217,共7页
AIM: To clarify whether subclassification of the type VI pit pattern on the basis of magnifying colonoscopy findings is useful in determining the type and depth of invasion of colorectal neoplasms.METHODS: We retrospe... AIM: To clarify whether subclassification of the type VI pit pattern on the basis of magnifying colonoscopy findings is useful in determining the type and depth of invasion of colorectal neoplasms.METHODS: We retrospectively analyzed 272 colorectal neoplasms (117 dysplasias and 155 submucosal invasive carcinomas; 228 patients) with a type V pit pattern [type VI, n = 202; type VN, n = 70 (Kudo and Tsuruta classification system)]. We divided lesions with a type VI pit pattern into two subclasses, mildly irregular lesions and severely irregular lesions, according to the prominent and detailed magnifying colonoscopy findings. We examined the relation between these two subclasses and histology/invasion depth.RESULTS: One hundred and four lesions (51.5%) were judged to be mildly irregular, and 98 lesions (48.5%) were judged to be severely irregular. Ninety-seven (93.3%) mildly irregular lesions showed dysplasias or submucosal invasion of less than 1000 μm (SM < 1000 μm). Fifty-five (56.1%) severely irregular lesions showed submucosal invasion equal to or deeper than 1000 μm (SM ≥ 1000 μm). Mild irregularity was found significantly more often in dysplasias or lesions with SM < 1000 μm than in lesions with SM ≥ 1000 μm (P < 0.01).CONCLUSION: Subclassification of the type VI pit pattern is useful for identifying dysplasias or lesions with SM < 1000 μm. 展开更多
关键词 Colorectal neoplasm MAGNIFICATION type VI pit pattern Depth of invasion
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Structural patterns of land types and optimal allocation of land use in Qinling Mountains 被引量:12
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作者 LIU Yan-sui, DENG Xiang-zheng (Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China) 《Journal of Geographical Sciences》 SCIE CSCD 2001年第1期99-109,共11页
The case study based on Qinling Mountains in Shaanxi Province of China, in virtue of the information from TM image, classifies the land types and analyzes their spatial and temporal differential law, and puts forward ... The case study based on Qinling Mountains in Shaanxi Province of China, in virtue of the information from TM image, classifies the land types and analyzes their spatial and temporal differential law, and puts forward three structural patterns of land types in mountainous areas, namely, spatial, quantitative and qualitative structures of mountainous land types. Furthermore, it has been noticed that the analysis of structural patterns can disclose the heterogeneity and orderliness of combination of land types, which can lay the theoretic foundation for comprehensively recognizing ecological characteristics and succession law of structure and function of land types. After the all-around comparative analysis, an optimal allocation of land use in Qinling Mountains has been put forward according to the principle of sustainable development and landscape ecology, which can lay the scientific foundation in practice for the structural adjustment and distribution optimization from the macro level to micro level. 展开更多
关键词 land types succession of land types structural patterns optimal allocation Qinling Mountains
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The regional types of China's floating population: Identification methods and spatial patterns 被引量:9
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作者 LIU Shenghe HU Zhang +1 位作者 DENG Yu WANG Yingjie 《Journal of Geographical Sciences》 SCIE CSCD 2011年第1期35-48,共14页
With the rapid increase of the number and influence of floating population in China,it is urgently needed to understand the regional types of China's floating population and their spatial characteristics. After revie... With the rapid increase of the number and influence of floating population in China,it is urgently needed to understand the regional types of China's floating population and their spatial characteristics. After reviewing the current methods for identifying regional types of floating population,this paper puts forward a new composite-index identification method and its modification version which is consisted of two indexes of the net migration rate and gross migration rate. Then,the traditional single-index and the new composite-index identification methods are empirically tested to explore their spatial patterns and characteristics by using China's 2000 census data at county level. The results show:(1) The composite-index identification method is much better than traditional single-index method because it can measure the migration direction and scale of floating simultaneously,and in particular it can identify the unique regional types of floating population with large scale of immigration and emigration. (2) The modified composite-index identification method,by using the share of a region's certain type of floating population to the total in China as weights,can effectively correct the over-or under-estimated errors due to the rather large or small total population of a region. (3) The spatial patterns of different regional types of China's floating population are closely related to the regional differentiation of their natural environment,population density and socio-economic development level. The three active regional types of floating population are mainly located in the eastern part of China with lower elevation,more than 800 mm precipitation,rather higher population densities and economic development levels. 展开更多
关键词 China floating population regional types spatial pattern composite-index identification method
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Weathering,shock metamorphism and type distribution patterns of 98 ordinary chondrites from the Grove Mountains,Antarctica 被引量:1
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作者 戴德求 王道德 缪秉魁 《Chinese Journal of Polar Science》 2009年第2期215-224,共10页
Petrography and mineral chemistry of ninety-eight ordinary chondrites from Grove Mountains (GRV), Antarctica, were presented and their. Weathering effect, shock metamorphism and type distribution patterns were discu... Petrography and mineral chemistry of ninety-eight ordinary chondrites from Grove Mountains (GRV), Antarctica, were presented and their. Weathering effect, shock metamorphism and type distribution patterns were discussed in this study. Among them, six are unequilibrated ordinary chondrites, including 3 H3 and 3 L3 ; and 92 meteorites are equilibrated ordinary chondrites, including 24 H-group ( 13 H4, 10 H5, 1 H6), 64 L-group (2 L4, 44 L5, 18 L6) and 4 LL-group (3 LL4, 1 LL5). Most GRV ehondrites ( 〉 90% ) displayed minor weathering effect ( W1 and W2). About half of the meteorites experienced severe shock metamorphism. They commonly contain shock-induced melt veins and pockets. These heavily shocked meteorites provide us with natural samples for study of high-pressure polymorphs of minerals. In addition, the Grove Mountains collection seems to have more abundant unequilibrated and L group ordinary ehondrites compared to the US Antarctic meteorite collection which were mainly found along the Transantarctic Mountains. 展开更多
关键词 ordinary chondrites WEATHERING shock metamorphism type distribution patterns Antarctica.
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Study on the pattern of train arrival headway time in high-speed railway 被引量:1
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作者 Changhai Tian Shoushuai Zhang 《Railway Sciences》 2024年第3期344-366,共23页
Purpose-The design goal for the tracking interval of high-speed railway trains in China is 3 min,but it is difficult to achieve,and it is widely believed that it is mainly limited by the tracking interval of train arr... Purpose-The design goal for the tracking interval of high-speed railway trains in China is 3 min,but it is difficult to achieve,and it is widely believed that it is mainly limited by the tracking interval of train arrivals.If the train arrival tracking interval can be compressed,it will be beneficial for China's high-speed railway to achieve a 3-min train tracking interval.The goal of this article is to study how to compress the train arrival tracking interval.Design/methodologylapproach-By simulating the process of dense train groups arriving at the station and stopping,the headway between train arrivals at the station was calculated,and the pattern of train arrival headway was obtained,changing the traditional understanding that the train arrival headway is considered the main factor limiting the headway of trains.Findings-When the running speed of trains is high,the headway between trains is short,the length of the station approach throat area is considerable and frequent train arrivals at the station,the arrival headway for the first group or several groups of trains will exceed the headway,but the subsequent sets of trains will havea headway equal to the arrival headway.This convergence characteristic is obtained by appropriately increasing the running time.Originality/value-According to this pattern,there is no need to overly emphasize the impact of train arrival headway on the headway.This plays an important role in compressing train headway and improving high-speedrailwaycapacity. 展开更多
关键词 High speed railway Train headway Train arrival headway Regular pattern Paper type Research paper
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Dietary Patterns and Their Association with Depression among Type 2 Diabetes Patients in Gaza Strip, Palestine 被引量:1
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作者 Abdel Hamid el Bilbeisi Mohammed Srour +2 位作者 Amany el Afifi Halgord Ali M. Farag Kurosh Djafarian 《Food and Nutrition Sciences》 2019年第5期533-550,共18页
Background: Depression is a common mental disorder. Globally, more than 340 million people of all ages suffer from depression. The aim of our study was to determine the association between major dietary patterns and d... Background: Depression is a common mental disorder. Globally, more than 340 million people of all ages suffer from depression. The aim of our study was to determine the association between major dietary patterns and depression among type 2 diabetes patients. Methods: This cross-sectional study was conducted among 480 type 2 diabetes patients attending primary healthcare centers in Gaza Strip, Palestine. The depression, anxiety, stress scales (DASS, 21-items) questionnaire was used to measure the score of depression. The participants’ demographic, socioeconomic and medical history data was collected and the 98-items semi-quantitative food frequency questionnaire was used for evaluating the dietary patterns. Statistical analysis was performed using SPSS version 20. Results: Based on depression scale, 29.0% of type 2 diabetes patients had depression, (58.3% females, and 41.7% males). The prevalence of mild, moderate, severe, and very severe depression was 11.7%, 8.5%, 6.7%, and 2.1%, respectively. Furthermore, two major dietary patterns were identified by factor analysis: The Western, and the grains-vegetables, and fruits patterns. After adjusting for the potential confounders, patients in the lowest tertile (T1) of the grains-vegetables, and fruits dietary pattern had a lower odds for depression (OR 0.763 95% CI (0.667 - 0.871), P value = 0.001);where as a higher odds for healthy (OR 1.443 95% CI (1.131 - 1.839), P value = 0.004), compared to those in the highest tertile (T3). Conclusion: The grains-vegetables, and fruits dietary pattern may be associated with a lower prevalence of depression, and has been shown to be the healthiest dietary pattern among type 2 diabetes patients. 展开更多
关键词 DEPRESSION DIETARY patterns Factor Analysis PREVALENCE type 2 DIABETES MELLITUS
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Identification of SNPs and expression patterns of FZD3 gene and its effect on wool traits in Chinese Merino sheep(Xinjiang Type) 被引量:4
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作者 ZHAO Bing-ru FU Xue-feng +9 位作者 TIAN Ke-chuan HUANG Xi-xia DI Jiang BAI Yan XU Xin-ming TIAN Yue-zhen WU Wei-wei ABLAT Sulayman ZENG Wei-dan HANIKEZI Tulafu 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2019年第10期2351-2360,共10页
As a member of the Frizzled family, Frizzled3 (FZD3) is a receptor of the canonical Wnt signaling pathway and plays a vital role in mammalian hair follicle developmental processes. However, its effects on wool traits ... As a member of the Frizzled family, Frizzled3 (FZD3) is a receptor of the canonical Wnt signaling pathway and plays a vital role in mammalian hair follicle developmental processes. However, its effects on wool traits are not clear. The objectives of this study were to identify the single nucleotide polymorphisms (SNPs) and the expression patterns of FZD3 gene, and then to determine whether it affected wool traits of Chinese Merino sheep (Xinjiang Type) or not. PCR-single stranded conformational polymorphism (PCR-SSCP) and sequencing were used to identify mutation loci, and general linear model (GLM) with SAS 9.1 was used for the association analysis between wool traits and SNPs. Quantitative real-time PCR (qRT-PCR) was used to investigate FZD3 gene expression levels. The results showed that six exons of FZD3 gene were amplified and two mutation loci were identified in exon 1 (NC_019459.2: g.101771685 T>C (SNP1)) and exon 3 (NC_019459.2: g.101810848, A>C (SNP2)), respectively. Association analysis showed that SNP1 was significantly associated with mean fiber diameter (MFD)(P=0.04) and live weight (LW)(P=0.0004), SNP2 was significantly associated with greasy fleece weight (GFW)(P=0.04). The expression level of FZD3 gene in skin tissues of the superfine wool (SF) group was significantly lower (P<0.05) than that of the fine wool (F) group. Moreover, it had a higher expression level (P<0.01) in skin tissues than in other tissues of Chinese Merino ewes. While, its expression level had a fluctuant expression in skin tissues at different developmental stages of embryos and born lambs, with the highest expression levels (P<0.01) at the 65th day of embryos. Our study revealed the genetic relationship between FZD3 variants and wool traits and two identified SNPs might serve as potential and valuable genetic markers for sheep breeding and lay a molecular genetic foundation for sheep marker-assisted selection (MAS). 展开更多
关键词 Chinese MERINO SHEEP (Xinjiang type) FZD3 single NUCLEOTIDE polymorphism (SNP) expression pattern association analysis WOOL TRAITS
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中国钨矿的矿床类型划分、空间分布和开发利用现状 被引量:2
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作者 余金杰 杨郧城 +3 位作者 陈其慎 陈绍聪 陈小丹 张蕊 《地球学报》 北大核心 2025年第5期945-953,共9页
我国钨矿床类型主要有斑岩型钨矿、矽卡岩型钨矿、云英岩型钨矿、石英脉型钨矿、蚀变花岗岩型钨矿、砂钨矿和其他类型钨矿。其中,矽卡岩型钨矿和石英脉型钨矿是主要矿床类型。本文编制了中国钨矿空间分布及开发利用现状图,共划分出13个... 我国钨矿床类型主要有斑岩型钨矿、矽卡岩型钨矿、云英岩型钨矿、石英脉型钨矿、蚀变花岗岩型钨矿、砂钨矿和其他类型钨矿。其中,矽卡岩型钨矿和石英脉型钨矿是主要矿床类型。本文编制了中国钨矿空间分布及开发利用现状图,共划分出13个成钨区带。我国钨矿具有广泛展布且局部集中的特点,大中型矿区及白钨矿矿石类型资源储量占主导。我国钨矿床共(伴)生组分多、综合利用价值大,但富矿少、贫矿多。钨矿是我国优势的矿产资源,我国是世界上最大的钨生产国和供应国,钨年产量占世界年产量的81%。我国钨产业链覆盖完整,前端和中端具有明显优势,高性能、高精度的高档硬质合金仍依赖国外进口。 展开更多
关键词 矿床类型 空间分布规律 利用现状 进出口 钨矿床
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当设计遇见AI:人工智能设计产品对消费者响应模式的影响 被引量:1
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作者 李斌 芮建禧 +2 位作者 俞炜楠 李爱梅 叶茂林 《心理学报》 北大核心 2025年第11期1914-1932,I0002-I0007,共25页
随着人工智能(Artificial Intelligence,AI)技术的迅速发展,利用AI设计产品与创新是未来一大趋势。文章基于刻板印象内容模型,通过6个递进实验(N=1418)探讨了设计来源(人类设计vs.AI设计)与产品类型(怀旧产品vs.创新产品)对消费者响应模... 随着人工智能(Artificial Intelligence,AI)技术的迅速发展,利用AI设计产品与创新是未来一大趋势。文章基于刻板印象内容模型,通过6个递进实验(N=1418)探讨了设计来源(人类设计vs.AI设计)与产品类型(怀旧产品vs.创新产品)对消费者响应模式(欣赏vs.厌恶)的影响、机制及边界条件。结果发现,对于怀旧产品,消费者更偏爱人类设计,呈现AI厌恶;对于创新产品,消费者更偏爱AI设计,呈现AI欣赏,即出现了“人类设计-怀旧产品”、“AI设计-创新产品”的匹配效应。进一步分析发现,加工流畅性在此匹配效应过程中起到中介作用;同时温暖感知与能力感知是导致加工流畅性的关键。此外,AI-人类协同设计模式、AI拟人化特征及消费者自我建构类型均在其中起到了调节作用。文章不仅揭示了消费者对人工智能设计不同类型产品的赞赏或厌恶的响应模式及其深层机理,同时亦为人工智能新时代下的AI+设计的战略规划及营销策略提供了参考。 展开更多
关键词 人工智能 设计来源 产品类型 消费者响应模式 人工智能厌恶或人工智能欣赏
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Stand development patterns of forest cover types in the natural forests of northern Baekdudaegan in South Korea
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作者 Ji Hong Kim Guangze Jin Sang Hoon Chung 《Journal of Forestry Research》 SCIE CAS CSCD 2015年第2期381-390,共10页
The purpose of this study was to classify current forest cover types,and to investigate stand development patterns for natural forests in six areas in northern Baekdudaegan,South Korea.Twenty-eight independent forest ... The purpose of this study was to classify current forest cover types,and to investigate stand development patterns for natural forests in six areas in northern Baekdudaegan,South Korea.Twenty-eight independent forest communities were aggregated into eight forest cover types by species composition in the overstory of each forest community.The forest cover types were of mixed mesophytic,‘‘others’ ’ deciduous,Quercus mongolica dominant,Q.mongolica pure,Pinus densiflora–Q.mongolica,P.densiflora,Betula ermanii,and Q.mongolica–P.koraiensis.The ecological information was organized by importance value and species diversity for each forest type.Based on the correlation between species diversity index and the abundance of Q.mongolica plus P.densiflora for corresponding forest cover types,we compared the developmental process and approximate successional pathway between each cover type.The P.densiflora forest cover type changes into the P.densiflora–Q.mongolica cover type,followed by the Q.mongolica dominant cover type through continuous invasion of the oak trees.Furthermore,the Q.mongolica pure cover type would spread toward the Q.mongolica dominant cover type with a mixture of various deciduous tree species.The Q.mongolica dominant cover type progresses through the other deciduous cover types to the mixed mesophytic cover type with diversified composition and structure.On the mid to lower slopes,with loamy soils and good moisture conditions,various deciduous forest types should progress,by ecological succession,toward the mixed mesophytic cover type without any further disturbance. 展开更多
关键词 Baekdudaegan Forest cover type Species composition Species diversity Stand development patternS
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Differential expression of immune-related genes between healthy volunteers and type 2 diabetic patients with spleen-deficiency pattern 被引量:5
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作者 Chen Longhui Yang Zemin +9 位作者 Chen Weiwen Li Ruliu Lin Chuanquan Guan Lihua Zhu Zhangzhi Chen Ruifang Li Saimei Zhao Lingbo Zeng Jinhao Wang Jianhua 《Journal of Traditional Chinese Medicine》 SCIE CAS CSCD 2015年第6期646-652,共7页
OBJECTIVE: To investigate the clinical differentiation of spleen-deficiency pattern(SDP), a group of symptoms and signs defined in terms of Traditional Chinese Medicine for its clinical practice.METHODS: Peripheral ve... OBJECTIVE: To investigate the clinical differentiation of spleen-deficiency pattern(SDP), a group of symptoms and signs defined in terms of Traditional Chinese Medicine for its clinical practice.METHODS: Peripheral venous blood(> 3 m L) was collected from each of six type 2 diabetes mellitus(T2DM)-SDP patients and six healthy volunteers. After the isolation of peripheral white blood cells(PWBCs), total RNA was extracted, and quality control was performed on all RNA samples. Microarray experiments were conducted using the Agilent human whole genome gene chip, and genes demonstrating differential expression were screened. Bioinformatics analysis was conducted on these genes using several online databases.RESULTS: We screened a total of 175 differentially expressed genes(DEGs), of which 111(63%) were down-regulated and 64(37%) were up-regulated in T2DM-SDP patients compared with healthy controls. Among the 175 genes, 158 had biological function annotations: 46(29%) were directly related to an individual's immune regulation or response, 25(16%) were associated with substance and energy metabolism of PWBCs which could also indirectly influence immunity, and the remaining87(55%) were involved in a variety of PWBC biological processes that might eventually influence the immune function. Kyoto Encyclopedia of Genes and Genomes pathway enrichment analysis revealed that the DEGs were predominantly enriched in seven immune-related pathways. Hierarchical cluster analysis identified gene expression patterns that were distinguishable between the two study groups.CONCLUSION: Our results suggest that T2DM-SDP patients experience significant hypoimmunity and/or immune dysfunctions, and possess a specific gene expression profile. These findings offer new insights into SDP and the clinical pattern differentiation of T2DM-SDP. 展开更多
关键词 Diabetes mellitus type 2 Immunity Metabolism Leukocytes OLIGONUCLEOTIDE array se-quence analysis Spleen-deficiency pattern
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北黄海及周边海域灾害地质特征及形成机制
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作者 陈珊珊 王中波 +4 位作者 陈晓辉 张勇 赵京涛 李攀峰 赵维娜 《海洋地质与第四纪地质》 北大核心 2025年第5期44-55,共12页
本研究基于北黄海及周边海域的多波束测深、浅地层剖面等地球物理数据,构建了北黄海全海域灾害地质分类体系,系统揭示了灾害地质类型、空间分布规律及其形成机制。首先,依据成因将北黄海灾害地质体划分为三类:内动力成因的活动构造类、... 本研究基于北黄海及周边海域的多波束测深、浅地层剖面等地球物理数据,构建了北黄海全海域灾害地质分类体系,系统揭示了灾害地质类型、空间分布规律及其形成机制。首先,依据成因将北黄海灾害地质体划分为三类:内动力成因的活动构造类、外动力塑造的海底表层类及浅层埋藏类;其次,阐明了灾害地质空间分布特征及区域风险等级,如山东半岛北部海域属高风险区,主导因素为地震与活动断层;最后,揭示了灾害地质发育的主控因素:晚第四纪海平面波动(MIS 5-MIS 1沉积旋回)是主导表层与埋藏灾害地质形成的关键,而构造活动则主要控制基底不稳定性,导致火山活动、岩浆底辟及浅埋基岩失稳等灾害地质。该成果为北黄海地区的灾害风险评估、涉海工程安全防护及资源勘探开发提供了重要的科学依据。 展开更多
关键词 灾害地质体 灾害地质类型 灾害地质空间分布 北黄海
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生物面料的图案设计制作方法分析 被引量:1
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作者 陈晓鹏 张佳敏 严晓燕 《上海纺织科技》 2025年第3期34-38,共5页
针对生物面料图案工艺的研究相对薄弱的问题,分析了生物面料在生成过程中进行图案设计和制作工艺方面的特殊性,探讨面料从流体到凝固过程中各个环节的图案制作的可能性。利用生物面料初始的流体状态、干燥过程中的特点进行图案创作,对... 针对生物面料图案工艺的研究相对薄弱的问题,分析了生物面料在生成过程中进行图案设计和制作工艺方面的特殊性,探讨面料从流体到凝固过程中各个环节的图案制作的可能性。利用生物面料初始的流体状态、干燥过程中的特点进行图案创作,对现有产品进行工艺分析,结合试验进行创作,总结生物面料图案的创作方法。提出生物材料的图案主要通过生成微生物、添加现成品和立体型图案等方法进行创造,通过调整微生物种类和培育条件、选择不同添加物和在干燥过程中塑形等方法能够形成丰富的图案变化。 展开更多
关键词 生物面料 图案设计 膜型面料
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Utilization Pattern of Oral Hypoglycemic Agents for Diabetes Mellitus Type 2 Patients Attending Out-Patient Department at a University Hospital in New Delhi
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作者 Mohammad Shamshir Alam Mohammed Aqil +2 位作者 Syed Akmal Shah Qadry Prem Kapur Krishna K. Pillai 《Pharmacology & Pharmacy》 2014年第7期636-645,共10页
Diabetes mellitus is the chronic disorder emerging as major world health problem which increases the rate of morbidity and mortality. The aim of the present study was to ascertain patterns of prescription of oral hypo... Diabetes mellitus is the chronic disorder emerging as major world health problem which increases the rate of morbidity and mortality. The aim of the present study was to ascertain patterns of prescription of oral hypoglycemic agents to type 2 diabetic patients attending a university hospital, and to assess patient compliance. A prospective, observational and non comparative study was conducted in 200 established diabetes mellitus type 2 patients attending outpatient department at Majeedia Hospital, New Delhi, India. Prescriptions from registered patients were included in the study. Once the consultation by the physician was over, the prescriptions were reviewed and the patients were interviewed. The information was collected in an inhouse designed documentation proforma. In a pool of 200 type 2 diabetics, more than half were female (n=106, 53%). The mean age of the patients were found to be 50.4 ± 11.7 years and mean body mass index, 25.8 ± 4.4 kg/m2. A total of 432 oral hypoglycemic agents were prescribed to the patients. Highly significant number of patients were prescribed combination therapy, (n=143, 71.5%) as compared to monotherapy (n=57, 28.5%), 展开更多
关键词 Diabetes Mellitus type 2 Medicine Usage Evaluation Drug UTILIZATION PRESCRIBING pattern. Oral HYPOGLYCEMIC Agent
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鄂尔多斯盆地东缘成家庄地区二叠系山西组三角洲前缘露头构型分析
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作者 师学耀 高超利 +7 位作者 孟旺才 赵逸 陈立军 王彩霞 冷丹凤 马洪志 马裕武 孙宁亮 《西北地质》 北大核心 2025年第1期135-149,共15页
通过野外露头精细解剖,基于露头的岩性、沉积构造、颜色及沉积环境,开展了鄂尔多斯盆地东缘山西柳林成家庄地区二叠系山西组三角洲前缘砂体构型研究。结果表明:研究区共有10种岩相类型及7种沉积单元,根据沉积旋回特征及岩相组合类型,识... 通过野外露头精细解剖,基于露头的岩性、沉积构造、颜色及沉积环境,开展了鄂尔多斯盆地东缘山西柳林成家庄地区二叠系山西组三角洲前缘砂体构型研究。结果表明:研究区共有10种岩相类型及7种沉积单元,根据沉积旋回特征及岩相组合类型,识别出了分流河道、分流砂坝、潮汐砂坝、河口坝、远砂坝、席状砂6种4级构型单元,它们又以复杂的组合方式构成三角洲前缘5级构型单元。构型单元的组合样式可分为垂向叠置、侧向拼接及孤立式3种。通过实地测量对构型单元进行了定量表征,分流河道、分流砂坝、河口坝、远砂坝砂体厚度和宽度之间存在线性关系,且具有较高的相关性,能够为地下构型单元建模提供一定的地质依据。 展开更多
关键词 二叠系山西组 三角洲前缘 岩相类型 露头构型 组合样式 定量表征
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深层破坏边坡地质结构模式与滑坡灾害点识别
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作者 袁宝远 黄炎 《水利与建筑工程学报》 2025年第5期165-171,共7页
为解决青海东部红层区深层破坏型滑坡隐蔽性强、识别难及工程风险防控不足的问题,以引黄济宁工程供水区为研究区域,对红层强亲水性、遇水易崩解、力学性能弱的特性及斜坡深层破坏频发的工程现状展开研究。通过野外调查、勘探与数值模拟... 为解决青海东部红层区深层破坏型滑坡隐蔽性强、识别难及工程风险防控不足的问题,以引黄济宁工程供水区为研究区域,对红层强亲水性、遇水易崩解、力学性能弱的特性及斜坡深层破坏频发的工程现状展开研究。通过野外调查、勘探与数值模拟,建立红层区深层破坏型斜坡地质结构模式并以中坝乡斜坡点为例进行灾害点识别。结果表明:红层区存在红层泥岩为主型、泥岩与砂砾岩组合型和红层砂砾岩为主型三类典型地质结构模式,其深层破坏的核心控制因素为“可浸泡接触面(砂-泥岩/砂砾岩-泥岩)”与“后缘垂直深裂隙(降雨入渗通道)”;识别出中坝乡斜坡变形体为深层破坏型滑坡灾害点,该变形体在天然(稳定系数1.67)、地震工况(稳定系数1.38)下稳定性较好且破坏集中于表面,降雨入渗工况下稳定系数降至0.67,会沿砂岩-泥岩接触面发生深层破坏。勘察需重点关注泥岩为主型、砂砾岩为主型斜坡中的厘米级夹层。 展开更多
关键词 深层破坏型 斜坡 地质结构模式 滑坡灾害点
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空间正义视角下学前教育资源空间格局的现实挑战与政策建议 被引量:2
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作者 郑楚楚 周星宇 +1 位作者 虞永平 杨昕 《学前教育研究》 北大核心 2025年第6期1-13,共13页
空间正义是学前教育资源空间配置向纵深发展而产生的新价值诉求。以我国某东部城市为例,对城市学前教育资源空间格局进行分析,发现:尽管总量充足且覆盖率大幅提升,城市学前教育资源仍面临局部空间供需错配、远郊幼儿入园远、优质教育资... 空间正义是学前教育资源空间配置向纵深发展而产生的新价值诉求。以我国某东部城市为例,对城市学前教育资源空间格局进行分析,发现:尽管总量充足且覆盖率大幅提升,城市学前教育资源仍面临局部空间供需错配、远郊幼儿入园远、优质教育资源空间隔离、低收入家庭入园贵等正义缺失问题。城市内部的社会空间分异提高了学前教育资源空间配置的复杂性。在人口新形势和高质量学前教育发展的背景下,应转变以追求规模效益为主的“自然-物理”资源布局观,在“社会-空间”互动的基础上构建立体的学前教育资源空间格局,充分发挥政府的弱势补偿和再分配功能,通过对学前教育资源物理空间、功能空间、心理空间、价值空间四层空间的整体性治理,推进学前教育空间布局正义。 展开更多
关键词 空间正义 学前教育资源 空间格局 新型城镇化
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高能溃决洪水侵蚀机理与地貌效应研究进展 被引量:2
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作者 杨泽文 吴兵兵 +5 位作者 刘维明 杨安娜 李雪梅 王昊 阮合春 周燕莲 《地球科学》 北大核心 2025年第2期718-736,共19页
高能溃决洪水作为一种高量级、低频率的极端地表事件,其所具有的强烈侵蚀和重塑能力极大影响着地表形貌的演化.近年来,有关高能溃决洪水的研究逐渐增多,然而相关的侵蚀机制与地貌效应仍缺乏系统性认识.通过系统梳理国内外高能溃决洪水... 高能溃决洪水作为一种高量级、低频率的极端地表事件,其所具有的强烈侵蚀和重塑能力极大影响着地表形貌的演化.近年来,有关高能溃决洪水的研究逐渐增多,然而相关的侵蚀机制与地貌效应仍缺乏系统性认识.通过系统梳理国内外高能溃决洪水侵蚀研究中的相关进展,总结了高能溃决洪水形成的大、中、小3种侵蚀地貌及相关特征,分析了包括拔蚀、空蚀、涡蚀和磨蚀四种高能溃决洪水侵蚀模式与发生条件,进一步归纳了高能溃决洪水典型侵蚀效应.最后结合国内外研究热点,从多方法揭示高能溃决洪水侵蚀机理与驱动因素、侵蚀运移作用下的“工具效应”与“覆盖效应”、高能溃决洪水与颗粒破碎的功能关系及侵蚀和构造抬升的耦合作用等方面对未来高能溃决洪水侵蚀研究进行了展望.旨在深入理解高能溃决洪水的发生规律及其侵蚀过程,加深对此类灾难性极端地表事件与地貌演化之间关系的认识. 展开更多
关键词 溃决洪水地貌 侵蚀机制 侵蚀模式与类型 侧向侵蚀 地貌演化 地貌学
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黄河流域堡寨聚落的分布特征及空间模式研究——以关中地区为例
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作者 王绚 范伟 王艳 《新建筑》 2025年第1期94-98,共5页
明清时期黄河流域战乱频仍,营建堡寨是当地居民寻求安全自保的重要聚落与建筑方式。关中地区作为黄河中游的典型区域,有着广泛的堡寨分布与遗存,具有重要的研究价值。文章以关中地区堡寨聚落作为研究对象,在结合史料背景及地理信息数据... 明清时期黄河流域战乱频仍,营建堡寨是当地居民寻求安全自保的重要聚落与建筑方式。关中地区作为黄河中游的典型区域,有着广泛的堡寨分布与遗存,具有重要的研究价值。文章以关中地区堡寨聚落作为研究对象,在结合史料背景及地理信息数据分析的基础上,探明该地区堡寨聚落的分布特征及驱动要素;进而,根据堡寨聚落分布的地形特征将其划分为平原和塬边堡寨聚落类型,运用图示方法分别揭示堡寨聚落受地形影响下的空间模式特征。结果表明,关中地区堡寨聚落具有集群分布特征;平原和塬边堡寨聚落类型分别具有“自适应性”和“环境适应性”特征。 展开更多
关键词 黄河流域 堡寨聚落 分布特征 空间模式 关中地区
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西北干旱荒漠区排矸场植被模式生态恢复效果评价 被引量:1
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作者 邓雅元 侯晓磊 +7 位作者 武春丽 麻文章 赵廷宁 曾文杰 巩子涵 芦治源 吴国伟 安凡 《测绘科学》 北大核心 2025年第1期180-192,共13页
针对西北干旱荒漠区排矸场生态型植被模式生态恢复效果不明确的问题,在宁东煤炭基地排矸场选取25个样地进行调查,利用二段式命名法划分立地类型,利用双向指标种分析法划分不同生态型植被模式,并从生态适应性、生态功能性、经济性3个层... 针对西北干旱荒漠区排矸场生态型植被模式生态恢复效果不明确的问题,在宁东煤炭基地排矸场选取25个样地进行调查,利用二段式命名法划分立地类型,利用双向指标种分析法划分不同生态型植被模式,并从生态适应性、生态功能性、经济性3个层面选取指标对生态恢复效果进行评价,构建层次分析—熵权组合赋权模糊物元模型对各样地生态恢复综合效果进行评价。立地类型划分为8类;生态型植被模式包括4类乔木模式和4类灌木模式;不同模式的生态适应性和生态功能性存在明显差异,生态型植被模式的筛选应更加侧重于植被的生态适应性;根据综合效果评价结果,分别筛选出不同立地类型最适宜的生态型植被模式。 展开更多
关键词 排矸场 立地类型 生态型植被模式 生态恢复
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