搜索结果: 151-165 共查到“知识库 工学”相关记录331302条 . 查询时间(4.612 秒)
机械臂变长度误差跟踪迭代学习控制
迭代学习控制 误差跟踪 变迭代长度 机械臂
<
2024/1/16
针对任意初始状态下机械臂轨迹跟踪问题,提出一种变长度误差跟踪迭代学习控制(Iterative learning control,ILC)方法.首先,构造不依赖于期望轨迹的双曲余弦型期望误差轨迹,放宽经典迭代学习控制初始状态要求严格一致的条件.由于该误差轨迹只需设置一个常数项,因而能够有效减少计算量,使得期望误差轨迹的设计更为简单.其次,考虑机械臂运行区间随迭代次数变化的问题,构建虚拟误差变量补偿机...
基于加权矩阵的多维广义特征值并行分解算法
广义特征值分解 加权矩阵 并行分解 多维估计
<
2024/1/16
针对串行广义特征值分解算法实时性差的缺点,提出基于加权矩阵的多维广义特征值分解算法.与串行算法不同,所提算法能够在一次迭代过程中并行地估计出多维广义特征向量.平稳点分析表明:当且仅当算法中状态矩阵等于所需的广义特征向量时,算法达到收敛状态.通过对比相邻时刻的状态矩阵模值证明了所提算法的自稳定特性.所提算法参数选取简单,实际实施较为容易.数值仿真和实例应用进一步验证了算法的并行性、自稳定性和实用性。
Upgrading catalytic activity of NiO/CaO/MgO from natural limestone as catalysts for transesterification of coconut oil to biodiesel
Biodiesel Limestone Methyl ester PEG Vegetable oil
<
2023/12/19
Limestone was converted to high surface area CaO/MgO catalysts via calcination-hydration-dehydration (CHD) method for transesterification of coconut oil to biodiesel. Thermal?decomposition?at 900 degr...
Renewable UV-curable?polyester?methacrylate/cellulose nanocrystals composite?resin?for wood waterproof coating
UV-curable cellulose nanocrystals low viscosity composite star-shaped bio-based
<
2023/12/19
Low-viscosity UV-curable?resins?are widely used in industry as they allow for UV curing materials with reduced amounts of reactive diluents to adjust the viscosity. But their?mechanical properties?and...
Wood-inspired strategy to toughen transparent cellulose nanofibril films
Cellulose nanofibril film Wood-inspired strategy Lignosulfonic acid Toughness Transparency
<
2023/12/19
The simultaneous attainment of high strength and high toughness of transparent cellulose nanofibril (CNF) film can expedite its uses in advanced applications. In this work, a wood-inspired strategy is...
Hexachlorocyclotriphosphazene Functionalized Graphene Oxide as a Highly Efficient?Flame Retardant
flame-retardant thermal stability epoxy resin combustion
<
2023/12/19
A?flame-retardant?composite was synthesized through a simple graphene oxide functionalization route with hexachlorocyclotriphosphazene and p-phenylenediamine. Flame experiments conducted on the synthe...
Synthesis of a Novel?Flame Retardant?Containing Phosphorus, Nitrogen, and Silicon and Its Application in?Epoxy?Resin
Flame Retardant Epoxy Resin thermal stability mechanical properties
<
2023/12/19
A novel?flame retardant?(TDA) containing phosphorus, nitrogen, and silicon was synthesized successfully via a controllable ring-opening addition reaction between 1,3,5-triglycidyl isocyanurate, 9,10-d...
Fast pyrolysis of?pitch pine biomass?in a bubbling fluidized-bed reactor for bio-oil production
Pinus rigida pitch pine Thermogravimetric analysis Fast pyrolysis Bubbling fluidized-bed reactor Bio-oil
<
2023/12/18
The kinetic parameters for the pyrolysis of biomass of the pitch pine (Rigida pine?P. Mill) were examined by thermogravimetric analysis in the temperature range 25?°C to 700?°C, in which the main deco...
Lignocellulosic biomass based biorefinery: A successful platform towards circular bioeconomy
Lignocellulosic biorefinery Circular bioeconomy Lignin Cellulose Hemicellulose Value added products
<
2023/12/18
Biorefining of second-generation feedstock gains more attention to improve the living standards and promote circular bioeconomy. The biorefinery concept made an effort to make the environmentally sust...
Addition of Pine Rosin to Pectin bioplastic films for improved water resistance
Pine?Rosin Pectin Bioplastics Water resistance
<
2023/12/18
Pectin films were prepared by addition of different quantities of Rosin in order to test the effects of this natural hydrophobic polymer in increasing the water resistance of Pectin films. Scanning El...
Fully Bio-Based Polyhydroxyurethanes with a Dynamic Network from a Terpene Derivative and Cyclic Carbonate Functional Soybean Oil
fully bio-based non-isocyanate?polyurethanes dynamic covalent bond exchange self-healing recyclability shape memory
<
2023/12/18
Polyhydroxyurethanes (PHUs), polyurethanes with excellent properties, are cured without poisonous isocyanate. The carbamate groups in the structure can undergo bond exchange in the presence of amino g...
Recent advances in carbon-based nanomaterials for?flame retardant?polymers and composites
Graphene Polymer Flame retardant Nanocomposite carbon nanomaterials Flammability
<
2023/12/18
An urgent need is to reduce the?flammability?of polymers and manage their toxic thermal?decomposition?products. Although conventional halogenated, metallic and phosphorus-based?flame retardants?(FRs) ...
食品非热加工是食品科学与工程学科的重点研究领域，食品非热加工北京市重点实验室主要围绕保证食品安全、提高食品品质等方向开展研究。为充分发挥本实验室的学科优势和良好的科研条件，推动和促进非热加工相关领域的研究创新，实验室围绕主要任务和研究方向设立开放基金课题，吸引国内外优秀人才开展合作研究。
Advances in the development of biobased epoxy resins: insight into more sustainable materials and future applications
Renewable sources bisphenol A biobased epoxy resins biobased fillers vegetable oils phenolic compounds curing agents
<
2023/12/15
The urgent need to replace fossil resource-based products is considerably increasing in the past few years, resulting in the search for more sustainable materials, with the aim of reducing the wastes ...
Fumaric acid production using alternate fermentation mode by immobilized Rhizopus oryzae-a greener production strategy
Agro-industrial residue Fumaric acid Rhizopus oryzae Immobilization Polystyrene
<
2023/12/15
The current work investigates the impact of using immobilized Rhizopus oryzae NRRL 1526 for bioproduction of fumaric acid using agro-industrial residues as feedstock. This use of agro-industrial resid...