Results 21 to 30 of about 211,057 (162)
, 2013 正确评估景区游憩价值是一个具有理论意义和实践价值的亟待解决的科学问题。多方案条件价值法(MPCVM)的理论基础是福利计量理论和要素价值理论,能够评估出各资源要素的游憩价值,其科学性和准确性优于仅能评估出整体价值的CVM。文章结合太姥山景区的实地问卷调查,在计量模型的比较研究基础上应用MPCVM评估景区旅游资源各要素的游憩价值,并进一步揭示各要素间的互补/替代关系。实证研究结果表明:受访游客的年龄、教育程度、月收入、认知度、满意度都与改善方案的选择概率呈显著正相关;旅游资源各要素间的游憩价值差异较大 ...
周春波, 林璧属
core
增强CT淋巴结形态联合错配修复蛋白表达检测对结直肠癌区域淋巴结转移的评估作用
Zhongguo shiyan zhenduanxue, 2023 目的 分析增强电子计算机断层扫描(CT)淋巴结形态联合错配修复蛋白(MMR)表达检测对结直肠癌区域淋巴结转移的评估作用。方法 选取2019年8月-2021年8月收治的结直肠癌患者89例，均采取手术治疗，术前行增强CT扫描及病理穿刺检测病灶组织MMR表达情况。以术中结果为标准，评价增强CT淋巴结形态联合MMR表达检测对直肠癌区域淋巴结转移的评估价值。结果 淋巴结转移患者高分化和pT3-4期百分率与淋巴结未转移患者比较，差异有统计学意义 ...
严征远, 卜雪峰, 曹能琦, 张恒
doaj
Synthesizing Empirical Research on Learner Metacognition in Second Language Writing
International Journal of Applied Linguistics, EarlyView.ABSTRACT Despite considerable research interest in learner metacognition in second language (L2) writing, there is not yet a review that synthesizes the existing empirical findings and discusses their implications. To fill the void, this systematic review synthesized 39 empirical studies on learner metacognition in L2 writing and examined their salient
Chen Li, Icy Lee, Zhicheng Mao
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Zhongguo shiyan zhenduanxue, 2021 随着对复发性流产的进一步认识,男性精子质量的重视度也逐渐增加,传统精液常规检测有一定的评估价值,但已不能完全评价男性精子质量[1]。现新兴的精子质量评估包括:蛋白质组学[2]、DNA甲基化[3]、凋亡标志物体[4]等。但因其检测技术复杂且昂贵,并未纳入临床检查,现精子DNA碎片化指数(DFI)检测技术越来越受重视,已成为精子质量评估的新标准[5]。另,精索静脉曲张在复发流产影响因素中的研究也越来越重要[6]。
李光, 吴艳楠, 张译夫, 文陶非
doaj
Democratic Values in Citizen Participation: What Citizens Prioritize in Participation
Policy Studies Journal, EarlyView.ABSTRACT Citizen participation is often initiated to strengthen democracy. While participatory innovations are typically assessed through normative frameworks emphasizing democratic values, little is known about which of these values are prioritized by citizens.
Take Sipma, Frank Hendriks
wiley +1 more source
Zhongshan Daxue xuebao. Yixue kexue ban, 2006 【目的】界定颈动脉内中膜厚度及其斑块分级在估测冠心病中的最佳预测值。【方法】用高频超声检测125例患者颈总动脉内中膜厚度、颈动脉分叉处内中膜厚度，以及颈动脉斑块分级，评价它们估测冠心病的作用，并用ROC曲线评价它们的诊断价值。【结果】冠心病组颈总动脉及分叉处内中膜增厚、斑块分级高，与对照组比较差异有统计学意义，P〈0．05；ROC分析显示颈总动脉及分叉处内中膜增厚、斑块分级均可估测冠心病，其曲线下面积分别为0．70、0．75、0．74；将颈总动脉分叉处内中膜增厚≥1．3mm，颈总动脉内中膜增厚≥0 ...
刘东红 +5 more
doaj
Functional Ecology, Volume 40, Issue 7, Page 2332-2344, July 2026.Read the free Plain Language Summary for this article on the Journal blog. Abstract The stoichiometric ratios of carbon (C), nitrogen (N) and phosphorus (P) serve as important indicators for assessing nutrient balance in forest ecosystems, but their relationships with photosynthetic dynamics require deeper characterization.
Minghao Chen +9 more
wiley +1 more source
Differences in characteristics between naturalized threatened plants and other threatened plants
Conservation Biology, Volume 40, Issue 3, June 2026.Abstract Many non‐native plant species introduced by humans have become naturalized. At the same time many species are threatened in their native range. However, the number of plant species threatened in their native range that are naturalized elsewhere remains unknown.
Weihan Zhao +10 more
wiley +1 more source
Clinical significance of estimating fetus weight for diagnosing giant infants
Huli yanjiu, 2005 [目的]评价测量估算胎儿体重对诊断巨大儿的临床价值。[方法]以回顾性诊断试验评价为研究方式,采用产前胎儿体重估算和新生儿出生后测重,对120例疑似巨大儿者以出生后测重做为金标准,统计数据列入四格表计算。[结果]在107例巨大儿中,103例与产前测量估算相符合,灵敏度96.1%、特异度92.2%、准确度95.8%、阳性预告值99.0%。[结论]测量估算胎儿体重诊断巨大儿的方法简单、经济、快速、可靠。
党云芳
doaj
Representation of obligate groundwater‐dwelling copepod diversity in European protected areas
Conservation Biology, Volume 40, Issue 3, June 2026.Abstract Groundwaters sustain diverse surface ecosystems and are populated by metazoan species, mostly invertebrates, that provide fundamental ecological functions and are often of prominent conservation value due to narrow endemism and high phylogenetic rarity.
Francesco Cerasoli +7 more
wiley +1 more source