Results 21 to 30 of about 1,356,455 (168)

Burrow‐Based Monitoring of Chinese Pangolin (Manis pentadactyla) Reveals Importance of Core Natural Habitat in Hong Kong 中華穿山甲 (Manis pentadactyla)洞穴監測揭示香港內陸郊野地帶的重要性

open access: yesIntegrative Conservation, Volume 5, Issue 2, Page 205-216, June 2026.
Relatively little is known about the distribution or habitat requirements of Hong Kong's population of the Chinese pangolin. Between 2018 and 2021 we searched for pangolin burrows and deployed camera traps on the burrows. We then analyzed habitat suitability at multiple scales to determine the factors that are key in driving pangolin distributions in ...
Anna Goldman   +9 more
wiley   +1 more source

一种苯酚甲醇气相烷基化生产甲酚的方法 [PDF]

open access: yes, 2014
本发明涉及一种苯酚甲醇气相烷基化生产甲酚的方法,苯酚、甲醇经预热后与稀释气混合连续通过苯酚甲醇烷基化催化剂床层,在反应温度200-500℃、进料重量空速0.5-20h-1反应条件下进行气相反应生成甲酚。以MCM-22,ZSM-5,beta分子筛为活性组份改性制得苯酚甲醇烷基化催化剂。以苯酚甲醇为原料,甲酚选择性可达90%,对位选择性可达58%,催化剂稳定性好。生产过程中无设备腐蚀,是一种环境友好的催化剂 ...
 刘中民,  徐云鹏, 王坤院
core  

Designing “Sphere/Network” Hierarchical Dielectric Loss Structure for Efficient Electromagnetic Wave Absorption

open access: yesRare Metals, Volume 45, Issue 6, June 2026.
ABSTRACT Electromagnetic wave absorption materials require high dielectric loss and excellent impedance matching performance. However, current conventional biomass‐derived electromagnetic wave absorption materials are still limited by low electrical conductivity and a single structure.
Yue Zhang   +9 more
wiley   +1 more source

甲苯甲醇烷基化制对二甲苯和低碳烯烃固定床催化剂及应用 [PDF]

open access: yes, 2009
一种甲苯甲醇烷基化制对二甲苯和低碳烯烃固定床催化剂,由金属、非金属或/和稀土金属改性后的沸石分子筛再经硅氧烷基化合物修饰表面酸性和孔结构得到;其中:碱土金属含量为催化剂总重量的0.1-8wt%;非金属含量为催化剂总重量的0.1-8wt%;稀土金属含量为催化剂总重量的 0.1-5wt%;硅氧烷基化合物修饰后Si的担载量为催化剂总重量的1-10wt%。该催化剂用于甲苯甲醇选择性烷基化制对二甲苯和低碳烯烃反应,产物中对二甲苯在二甲苯异构体中的选择性大于99%,乙烯和丙烯在C1-C5组分中选择性大于90 ...
刘中民   +4 more
core  

膀胱移行细胞癌组织基因的P14ARF、DAPK、RARβ甲基化变异分析

open access: yesZhongguo shiyan zhenduanxue, 2012
目的通过检测新鲜冰冻膀胱癌组织中P14ARF、DAPK、RARβ基因的启动子CpG岛基因的甲基化状态,探讨P14ARF、DAPK、RARβ在膀胱癌发生过程中的作用及诊断意义。方法采用甲基化特异性PCR技术检测48例手术切除的膀胱癌组织和其中13例相应癌旁组织标本、17例非肿瘤患者正常膀胱组织中DAPK、RARβ、P14ARF基因的甲基化情况。结果 48例膀胱癌组织中发现P14ARF基因异常甲基化13例(27.0%),DAPK基因异常甲基化13例(27.0%);RARβ基因异常甲基化44例(91.6 ...
王凯臣   +5 more
doaj  

3D Printed High‐Strength Hydrogel for Dual Release of Cu2+ and Ag+ Ions to Enhance Bone Repair and Antibacterial Properties

open access: yesRare Metals, Volume 45, Issue 6, June 2026.
ABSTRACT Bone restoration is often hindered by the spatiotemporal dysregulation of immune and regenerative signals. Conventional bio‐inert implants, providing only passive support, fail to modulate this microenvironment, leading to infections and poor healing.
Zhizhong Sun   +8 more
wiley   +1 more source

一种可用作香料的化合物3-(3-甲基苯基)-丁醛 [PDF]

open access: yes, 1996
一种新化合物3—(3-甲基苯基)-丁醛,具有分子式$本发明所提供的3-(3-甲基苯基)-丁醛具有清新,优雅的西瓜香味,可做为香料开发 ...
贾卫民, 宋树忠
core  

Enhancement of Corrosion and Wear Resistance in Polymeric Coatings via Ce(III)‐Functionalized Ternary ZnAlCe Layered Double Hydroxides Intercalated With EDTMP

open access: yesRare Metals, Volume 45, Issue 6, June 2026.
ABSTRACT The intricate corrosion environment necessitates the polymeric coating's adaptability to the surroundings. In this work, the integration of rare‐earth Ce(III) ions and ethylene diamine tetramethylene phosphonic acid (EDTMP) in a layered double hydroxide (LDH) material is developed to enhance the corrosion protection and anti‐wear properties of
Yangu Liu   +9 more
wiley   +1 more source

一种甲苯甲基化制对二甲苯联产低碳烯烃的方法 [PDF]

open access: yes, 2006
一种甲苯甲基化制对二甲苯联产低碳烯烃的方法,该方法可以使用一种催化剂在高选择性生产对二甲苯的同时高选择性地联产乙烯和丙烯。该方法采用甲苯与甲基化试剂同时进料,在不同的操作条件下,产物中对二甲苯在二甲苯异构体中的选择性可达到85-95wt%,乙烯和丙烯在 C1-C5低碳烃中选择性可达到70-85wt%,同时产物中对二甲苯与乙烯分子比可以调节 ...
刘中民, 张新志, 华邦嵩, 许 磊
core  

Representation of obligate groundwater‐dwelling copepod diversity in European protected areas

open access: yesConservation 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

Home - About - Disclaimer - Privacy