搜索结果: 1-14 共查到“知识库 工学 bark”相关记录14条 . 查询时间(0.015 秒)
Enhanced performance of rosin-based epoxy composites mixed with carbon nanotubes and cork powders from oriental oak bark
Rosin Epoxy resin Carbon nanotubes Cork powders Thermal properties Mechanical properties
2024/1/12
Rosin-based epoxy composites with high-impact toughness, tensile strength, modulus, and excellent flame retardance were prepared through a simple and effective approach. In this study, rosin-based epo...
Multifunctional tannin extract-based epoxy derived from waste bark as a highly toughening and strengthening agent for epoxy resin
Waste bark Tannin extract Liquefaction Bio-based epoxy Toughness
2023/12/6
To reduce crude oil consumption and the corresponding environmental impact, the use of sustainable resources has recently attracted much attention. Herein, a low-viscosity and efficient tannin-based e...
Development and evaluation of a hydrogenated rosin (β-acryloxyl ethyl) ester–bonded silica stationary phase for high-performance liquid chromatography separation of paclitaxel from yew bark
Rosin-based stationary phase Paclitaxel Retention mechanism Separation Yew-bark extract
2023/12/5
Paclitaxel (PTX) is a complex diterpenoid anticancer drug whose separation from yew biomass poses a significant challenge. In this study, a new stationary phase comprising hydrogenated rosin (β-acrylo...
Libby Amphibole Contamination in Tree Bark Surrounding Historical Vermiculite Processing Facilities
Vermiculite Asbestos Amphibole Libby Exfoliation Tree Bark
2013/3/12
Over a 70-year period, a mine near Libby, MT supplied nearly 80% of the world’s vermiculite. Raw vermiculite, which was contaminated with naturally occurring amphibole in veins throughout the deposit,...
基于BARK子波变换的语音增强方法研究
Bark子波 语音增强 阈值
2009/12/10
在Bark子波的构造的基础上，提出一种改进的Bark子波变换构造方法，即直接由临界带中心频率确定Bark子波的中心频率，保证了其通带和临界带的对应一致性，并与人耳的听觉系统十分吻合。采用Bark子波对带噪语音进行分解，在语音信号的子带层次上用一种类似于软阈值的无穷阶可导的函数进行阈值处理，并应用谱减法进行二次增强。仿真实验表明，构建Bark子波与增强算法使信噪比和PESQ得分都有较大提高，特别是在...
RED DEER (Cervus elaphus) BARK STRIPPING ON SPRUCE WITH REGARD TO SPATIAL DISTRIBUTION OF SUPPLEMENTAL FEEDING PLACES
Cervus elaphus red deer bark stripping Norway spruce Picea abies forest damages
2009/11/27
Forest damages caused by red deer and some other large herbivore species occasionally feeding on tree bark, are a grave ecological and economic problem in many parts of the world. Winter supplemental ...
Insect pathogens with special reference to pathogens of bark beetles (col.,Scolytidae: Ips typographus L.).Preliminary results of isolation of entomopathogenic fungi from two spruce bark beetles in Slovenia
insect pathogens beetles pathogens entomopathogenic fungi Scolytidae Ips typographus
2009/11/26
This paper deals with the most important groups of insect pathogens, i.e. viruses, bacteria, fungi, nematodes and protozoans (microsporidia). We describe their basic characteristics, virulence, method...
Chemical Characteristics of Bark Tannins and Their Chemical and Enzymatic Conversions
bark condensed tannins alkaline rearrangement reaction amination laccase
2009/11/23
In the wood industry, large quantities of wastes are generated. Bark is one of the typical wastes, and the rate of its utilization is considerably lower than that of other main wood wastes such as sla...
基于Bark域噪声估计及掩蔽效应的语音增强
语音增强 噪声估计 Bark域
2009/8/20
针对非平稳环境下噪声估计和语音增强性能降低的特点，提出一种基于Bark域的快速自适应噪声谱估计算法。它基于听觉模型，将带噪信号变换到Bark域，并在Bark域内实现基于人耳掩蔽的语音增强。仿真实验表明该算法能充分利用Bark带内频带间的相关性，跟踪快变的背景噪声，提高语音增强性能，减少运算量和复杂度。
Research and Development of Biodegradation Disposal for SBS (Sugi Bark Sorbent)
Biodegradation Disposal SBS
2009/4/29
Sugi bark sorbent (SBS), which is recycled waste, is comparable to commonly used petroleum products in performance and cost and has lower environmental loads. It has been commercially produced since 2...
Antioxidant activity of phenolic fractions of Mallotus philippinensis bark extract
Mallotus philippinensis bark extract natural antioxidants phenolic compounds tannins
2014/3/10
Phenolic compounds were extracted from Mallotus philippinensi bark using methanol. Six fractions (I–VI) were separated from the extract on a Sephadex LH-20 column using ethanol and acetone-water as th...
Molded Charcoal Prepared from Bark Charcoal and Wood Pyrolysis Tar
wood pyrolysis tar charcoal molding
2009/3/6
Bark chips of Acacia mangium, which are produced as wood waste by an Indonesian pulp factory, were carbonized to powdered charcoal at a temperature range between 300∼400°C. The by-product, tar, ...
Effects of Mimosa Bark Usage on Some Properties of Particleboard
Particleboard mimosa bark formaldehyde emission mechanical properties physical properties
2009/1/12
The objective of this study was to determine the effect of mimosa bark usage on the formaldehyde emission, physical and mechanical properties of particleboard. Fifteen panels from black locust (Robini...