Results 71 to 80 of about 19,908 (197)

现代化水利水电工程管理现状及改进分析

open access: yes水电科技
随着科技和社会的飞速发展,现代水利水电工程的规模和复杂性日益增加,对工程管理提出了更高的要求。水利水电工程作为基础设施建设的重要组成部分,直接关系到国家经济发展和社会生活水平的提升。基于此,如何适应新时代的工程管理需求,提高工程的经济效益和可持续性,成为当前亟待解决的重要问题。
肖 张
semanticscholar   +1 more source

Jellyfish blooms restructure plankton dynamics and trophic linkages in coastal waters

open access: yesFunctional Ecology, Volume 40, Issue 5, Page 1443-1460, May 2026.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Jellyfish blooms are increasing globally in frequency and intensity, introducing complex ecological interactions, yet the mechanisms by which they alter ecosystem structure remain poorly characterized due to a lack of sustained field observations.
Pengpeng Wang   +4 more
wiley   +1 more source

土壤侵蚀与水土保持科学重点研究领域与问题

open access: yesShuitu Baochi Xuebao, 2004
进入新世纪,我国土壤侵蚀与水土保持科学研究迎来了新的发展机遇和挑战。在分析我国土壤侵蚀与水土保持学科研究的社会需求、科学需求及其特殊性的基础上,指出了我国土壤侵蚀与水土保持科学研究中存在的主要问题,提出了该领域亟待解决的前沿科学问题,如土壤侵蚀过程与机理,土壤侵蚀预报模型,水土保持措施防蚀机理及其适用性,流域生态过程和水土保持措施配置,大尺度土壤侵蚀与水土保持的格局及其变化规律,土壤侵蚀与水土保持环境效应评价,土壤侵蚀研究新技术与方法等。
冷疏影 冯仁国 李锐 刘宝元 郑粉莉 刘国彬 王占礼 杨勤科 傅伯杰 宋长青
doaj  

Optimization of Plant-based Almond Yogurt Formulations and Characterization of Their Physical Properties Based on the Principal Component Synthesis Evaluation Approach [PDF]

open access: yes
This study aimed to optimize the formula of plant-based almond yogurt to improve its quality and storage stability. Using sweet almonds as the main ingredient and adding conventional yogurt stabilizers such as emulsifiers and thickeners, plant-based ...
Jianzhong ZHOU   +7 more
core   +1 more source

灾害干扰受损区自然恢复初期土壤物理性质的变化特征

open access: yesShuitu Baochi Xuebao, 2020
以洪涝诱发灾害干扰受损区的次生阔叶林、杉木林和毛竹林为研究对象,研究了3种林型自然恢复过程中土壤容重、孔隙度和田间持水量等11项土壤物理性质指标的变化规律及主要影响因素。结果表明:(1)次生阔叶林和杉木林在未受损—刚受损—受损恢复过程中土壤容重先增大后减小,毛竹林逐渐减小;次生阔叶林和杉木林总孔隙度、含水率、饱和持水量、毛管持水量和田间持水量先减小后增大,毛竹林逐渐减小;3种林型土壤质地先变粗后变细。(2)通过相关性分析和主成分分析,发现含水率 ...
李松阳   +7 more
doaj  

Effects of Emulsion Concentration on Physicochemical Properties of AOP/WPC Cold Set Emulsion-filled Hydrogels [PDF]

open access: yes
Emulsion-filled hydrogels had the advantages of emulsions and hydrogels. In this study, Pickering emulsions were embedded into a pre-AOP and WPC hydrogel polymer solution, which were subsequently gelatinized to form cold set emulsion-filled hydrogels to ...
Junhui WANG, Miaomiao SONG
core   +1 more source

Optimization of pectin extraction from immature fruits of Guanxi pomelo by Lactobacillus plantarum fermentation [PDF]

open access: yes
Objective: This study aimed to optimize the pectin extraction yield from immature fruits of Guanxi pomelo by L. plantarum fermentation and analysis of the properties of pectin extracted by L.s plantarum fermentation.
DING Hongxia   +3 more
core   +1 more source

中国西南水梯田土壤水分特性研究——以哈尼梯田为例

open access: yesShuitu Baochi Xuebao, 2021
为了研究中国西南水梯田的土壤水分特性,以云南哈尼梯田为例,选取哈尼梯田核心区全福庄小流域内林地、荒草地、旱地和水田4种土地利用类型,分层取0—10,10—20,20—40,40—60,60—80,80—100 cm深度土样测其主要土壤理化指标和土壤水分特征曲线,分析其土壤的持水性和水分有效性。结果表明:(1)哈尼梯田4种不同土地利用类型土壤容重变化范围为0.61~1.41 g/cm3,且0—40 cm与40—100 cm差异性显著,土壤有机质含量为1.17%~9.65 ...
李源, 宋维峰, 马建刚
doaj  

Theoretical Studies of Structures and Properties of Coals [PDF]

open access: yes, 2013
煤炭是我国的主体能源,但煤炭资源总量的40%为低品质煤,针对这部分资源开展计算模拟研究,对煤化学的发展和煤资源提质与优化利用具有积极意义。煤是由多个结构相似的基本结构单元通过桥键连接而成的大分子网状结构的混合物,其分子结构和相关的物理化学性质还不是很清楚。量子化学计算作为原子分子水平上研究复杂体系的理论工具,在煤结构与性质的研究中逐渐获得应用。本文通过密度泛函计算,对几类代表性煤分子的结构、光谱性质、裂解性质和持水性质进行了计算研究,获得的主要结果如下: (1)通过理论计算 ...
郭娟娟
core  

Optimization of the Solid-state Fermentation Process for Morchella esculenta Fermented Wheat and Analysis of Its Nutritional Components, Physicochemical Properties and Antioxidant Activity [PDF]

open access: yes
Using wheat grains as the raw material and Morchella esculenta as the fermentation strain, fungus fermented wheat (FFW) was prepared through a solid-state fermentation process.
Dandan GU   +5 more
core   +1 more source

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