Results 51 to 60 of about 74,833 (278)

In Situ MOF Pyrolysis Construction of Hierarchical Porous Co‐Nanoparticles/Carbon Cloth Composites for Enhanced Electromagnetic Wave Shielding and Absorption

open access: yesRare Metals, EarlyView.
ABSTRACT The development of high‐performance electromagnetic protection materials integrating broadband absorption and effective shielding capabilities is hindered by challenges in simultaneously optimizing multiple electromagnetic properties through conventional material designs.
Changlong Du   +9 more
wiley   +1 more source

对苯二甲酸二甲酯及其异构体的好氧微生物降解 [PDF]

open access: yes, 2004
Five morphologically distinct bacteria isolated from mangrove sediment by enrichment culture, were identified and tested for their ability to degrade dimethyl terephthalate (DMT) and its isomer dimethyl isophthalate (DMI). DMT at a concentration of 98 mg/
Gu, J, Li, J
core   +6 more sources

Cost-effective Solutions of Nitrogen Reduction in Enclosed Bay: Case Study of Sansha Bay, Fujian Province [PDF]

open access: yes, 2016
由于污染物过度排放导致环境质量下降和生境退化是目前全球很多海湾面临的重要挑战,而总氮、总磷等营养盐是造成海湾水体污染和生境退化的主要原因之一。营养盐削减,特别是通过海岸带湿地修复进行营养盐削减不仅可以缓解水体富营养化改善水质,还可以达到改善海湾生境的质量的目的。由于来源的多样性和复杂性,营养盐削减需要大量的成本。在需要解决的环境问题日益增多而预算有限的约束下,研究达到预定的环境目标、成本最低的营养盐削减方案是当务之急。不同地区、不同营养盐削减措施的成本不同,同时,不同地区 ...
徐瑞琦
core  

Advances in Elemene Nanodelivery Systems: From Material Design to Disease Treatment

open access: yesRare Metals, EarlyView.
ABSTRACT Elemene (ELE) is a bioactive sesquiterpenoid extracted from traditional Chinese herbs, demonstrating broad‐spectrum antitumor, anti‐inflammatory, and analgesic properties with significant therapeutic potential. However, its clinical utility is constrained by inherent physicochemical limitations, including volatility and hydrophobicity, which ...
Xiao Wang   +9 more
wiley   +1 more source

Histological and histochemical studies on the digestive system of Lunatia gilva(微黄镰玉螺消化系统的组织学与组织化学研究)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2003
微黄镰玉螺的消化系统由消化道和消化腺两部分组成:消化道包括口、食道、胃、肠及直肠;消化腺包括食道腺、肝胰腺和肛门腺,无唾液腺.在光学显微镜下,消化道由粘膜层、粘膜下层、肌层和外膜4层结构构成.描述了消化道及消化腺的结构特征,并利用组织化学方法测定了消化腺细胞中的蛋白质和酶类,对各消化腺的功能作了初步分析.
YINGXue-ping(应雪萍)   +3 more
doaj   +1 more source

The Resistance Research and Application of Typical Plants for Island Vegetation Restoration [PDF]

open access: yes, 2016
植被是海岛生态系统的重要组成部分,海岛植被修复对加快恢复受损的海岛生态环境,改善海岛居民的生活生产条件起关键作用。目前,我国大部分海岛生态破坏比较严重,而海岛植被修复工作起步较晚,海岛植被修复技术还不完善,对环境恶劣海岛植被修复依然缺乏良策。本文依托平潭海岛景观生境修复技术研究与示范项目,以木麻黄(Casuarinaequisetifolia)、夹竹桃(Neriumindicum)和台湾相思(Acaciaconfusa)为实验材料,室内人为控制干旱胁迫、根系盐胁迫和叶片盐胁迫的程度及时间 ...
陈慧英
core  

Composite‐Field Annealing Enables Superior High‐Temperature Noise Stability in Fluxgate Sensors With Co‐Rich Amorphous Microwires

open access: yesRare Metals, EarlyView.
ABSTRACT Fluxgate sensors with Co‐rich amorphous microwires, widely used for their low noise in magnetic field measurements, encounter significant challenges in high‐temperature environments such as well drilling and geological exploration. Prolonged thermal aging degrades the performance of Co‐rich amorphous microwires, resulting in increased noise ...
Lining Pan   +10 more
wiley   +1 more source

重庆市綦江地区秋季不同生境鸟类多样性研究

open access: yes野生动物学报, 2009
1999年9~10月,采用样方法对綦江地区森林生境、灌丛生境、农田生境的鸟类群落结构进行调查研究,结果表明:本次调查记录到鸟类79种,分属于9目25科,雀形目鸟类的种数最多,占总数的73.42%。国家Ⅱ级保护鸟类7种,占所观察到鸟类的8.86%。在调查研究的3种生境鸟类多样性从高到低的是农田生境、灌丛生境、森林生境。
李健, 蒋国福, 刘文萍
doaj  

气候变化对中国梅花鹿潜在栖息地影响

open access: yes野生动物学报, 2021
研究表明,气候变化将会使生物多样性降低甚至是物种灭绝。研究气候变化对物种栖息地的影响,对未来研究物种多样性和保护生态系统功能完整性提供实践意义。以梅花鹿(Cervus nippon)为研究对象,将23个环境因子通过去相关性后得到8个环境因子,利用最大熵(MaxEnt)模型模拟了梅花鹿基准气候条件下在中国潜在生境分布,并预测了ssp245和ssp585两种气候变化情景下2021—2040年(2030s)、2041—2060年(2050s)、2061—2080年(2070s)梅花鹿潜在分布。23个环境因子中,
刘策 张日 杜海荣 孙悦 袁子奥 于晶晶 张明海
doaj  

沉积物疏浚技术在富营养化湖泊修复中的应用 [PDF]

open access: yes, 2012
沉积物疏浚是削减富营养化湖泊内源负荷的最为直接和有效的手段。分析了沉积物疏浚的效果和可能引起的风险;从外源污染、作业区域和深度、沉水植物3个方面探讨了影响沉积物疏浚效果的关键因素。最后指出,富营养化湖泊沉积物疏浚的重要原则是截断外源污染、划分作业区域、合理控制挖掘深度、创造适宜生境、恢复沉水植物 ...
刘华丽   +3 more
core  

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