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直接驱动的风力涡轮机的快速动态建模

电力电子 2005年第2期3卷 42-47页

作者： Johan Morren Jan T.G.Pierik Sjoerd w.h.de haan

本文提出了带永磁发电机的直接驱动的风力涡轮机的快速动态模型。在推理该模型过程中,将研究重点放在提高模型的计算速度上,通过使用dq0变换(帕克变换)使得计算速度大大增加。本文也描述了dq0模型建立的方法,以及用一个研究案例显示了... 详细信息

本文提出了带永磁发电机的直接驱动的风力涡轮机的快速动态模型。在推理该模型过程中,将研究重点放在提高模型的计算速度上,通过使用dq0变换(帕克变换)使得计算速度大大增加。本文也描述了dq0模型建立的方法,以及用一个研究案例显示了该模型在动态仿真上的有效性。

关键词：风力涡蜗轮机动态建模风力涡轮机直接驱动动态模型计算速度永磁发电机动态仿真

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生物质及生物质相关止血材料的研究进展

复合材料学报 2024年

作者：敖青张戈丁功涛王子凡 Teow Yeit haan Sajab Mohd Shaiful 马忠仁赵蕾西北民族大学生物医学研究中心马来西亚国立大学工程与建筑环境学院

伤口的快速止血和愈合对于解决意外事故造成的出血具有重要意义，相关止血材料的开发和应用一直备受关注。以角蛋白、丝素蛋白、胶原蛋白为代表的蛋白类和以纤维素、壳聚糖、海藻酸为代表的多糖类等生物质材料，因其无毒性、低抗原性、... 详细信息

伤口的快速止血和愈合对于解决意外事故造成的出血具有重要意义，相关止血材料的开发和应用一直备受关注。以角蛋白、丝素蛋白、胶原蛋白为代表的蛋白类和以纤维素、壳聚糖、海藻酸为代表的多糖类等生物质材料，因其无毒性、低抗原性、良好的生物相容性、生物可降解性等优点在止血领域展现了前所未有的应用价值。基于此，本文对生物质止血材料的设计、制备及止血应用的最新研究进展进行了全面综述，并对其发展前景做了展望，以期为新型高效止血材料的开发和实际应用提供思路。

关键词：生物质材料蛋白质多糖止血性能伤口止血

Affinity Solvents for Intensified Organics Extraction: development Challenges and Prospects

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Tsinghua Science and Technology 2006年第2期11卷 171-180页

作者： André B. de haan University of Twente Enschede The Netherlands

In most organics extraction processes, the commonly used solvents employ solely physical interactions. Therefore, for the recovery and purification of products from complex mixtures, the selectivity and/or capacity of classical solvents towards the desired solutes is usually insufficient, enforcing the need for complex and thus expensive separation schemes. Significant simplification and cost-reduction can be achieved when affinity solvents would be available that are able to recognize the solutes of interest by their molecular structure. The main development challenges to establish such affinity solvents are： Selection and incorporation of molecular recognition and complexation capabilities; Evaluation of extraction capabilities; Efficient re- covery and recycling of the affinity solvents; Implementation in industrial extraction equipment. This paper presents how these development challenges are addressed at the University of Twente, going all the way from affinity solvent design and synthesis, via high throughput screening and characterization up to pilot plant evaluation. Essential in the successful development of affinity solvents are structural cooperations with molecular chemists and custom synthesis companies for their design and synthesis. The various aspects are illustrated by several examples where newly developed environmentally benign affinity solvents appeared able to create major breakthroughs. The applications addressed involve oxygenates, sugars, and pharmaceutical ingredients, such as optical isomers and biomolecules.

关键词： affinity solvent organics extraction molecular recognition complexation reaction

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Cyano-containing ionic liquids for the extraction of aromatic hydrocarbons from an aromatic/aliphatic mixture

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Science China Chemistry 2012年第8期55卷 1488-1499页

作者： MEINdeRSMA G. wytze de haan André B. department of Chemical Engineering & Chemistry Eindhoven University of Technology

Ionic liquids can replace conventional solvents in aromatic/aliphatic extractions, if they have higher aromatic distribution coef- ficients and higher or similar aromatic/aliphatic selectivities. Also physical properties, such as density and viscosity, must be taken into account if a solvent is applied in an industrial extraction process. Cyano-containing ionic liquids have a lower den- sity than the benchmark solvent sulfolane and a higher viscosity. Sulfolane is from a hydrodynamic point of view a better sol- vent than ionic liquids for the aromatic/aliphatic extraction. The most suitable ionic liquids for the extraction of aromatic hy- drocarbons from a mixture of aromatic and aliphatic hydrocarbons are [bmim]C(CN)3, [3-mebupy]N(CN)2, [3-mebupy]C(CN)3, [3-mebupy]B(CN)4 and [mebupyrr]B(CN)4. They have factors of 1.2-2.3 higher mass-based distribution coefficients than sul- folane and a similar or higher, up to a factor of 1.9 higher, aromatic/aliphatic selectivity than sulfolane. The IL [3-mebupy]N(CN)2 is a better extractant for the separation of toluene from a mixture of toluene/n-heptane in a pilot plant Ro- tating Disc Contactor (RDC) than sulfolane.

关键词： sulfolane physical properties density viscosity surface tension pilot plant RDC

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The Dialectics of China＇s Foreign Aid： Interactions Shaping China＇s Aid Policy

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Fudan Journal of the humanities and Social Sciences 2015年第4期8卷 617-648页

作者： ward warmerdam Arjan de haan Kortenaerkade 12 2518LT Den Haag The Netherlands

China＇s foreign aid has received much attention, but the knowledge of its determinants is limited. we show how domestic political forces interact with international circumstances to shape Chinese aid policies. The article applies Carol Lancaster＇s framework on the interaction of domestic ideas, institutions, and in- terests in the development of foreign aid policy. we describe the dynamics of the Chinese domestic context and the interaction of these forces with international circumstances. The article concludes that shifts in ideology and interest both fa- cilitated and required changes in the foreign aid program. while other countries are subject to similar domestic political forces, China appears relatively unique as donor because of large oscillations and simultaneous continuity of its aid program under the pressure of these domestic political forces.

关键词： Chinese foreign aid Domestic political forces Aid determinants Geopolitics

Digital synthesis of histological stains using micro-structured and multiplexed virtual staining of label-free tissue

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Light(Science & Applications) 2020年第1期9卷 1273-1285页

作者： Yijie Zhang Kevin de haan Yair Rivenson Jingxi Li Apostolos delis Aydogan Ozcan Electrical and Computer Engineering department University of CaliforniaLos AngelesCA 90095USA Bioengineering department University of CaliforniaLos AngelesCA 90095USA California NanoSystems Institute(CNSI) University of CaliforniaLos AngelesCA 90095USA department of Computer Science University of CaliforniaLos AngelesCA 90095USA department of Surgery David Geffen School of MedicineUniversity of CaliforniaLos AngelesCA 90095USA

histological staining is a vital step in diagnosing various diseases and has been used for more than a century to provide contrast in tissue sections,rendering the tissue constituents visible for microscopic analysis by medical ***,this process is time consuming,labour intensive,expensive and destructive to the ***,the ability to virtually stain unlabelled tissue sections,entirely avoiding the histochemical staining step,has been demonstrated using tissue-stain-specific deep neural ***,we present a new deep-learning-based framework that generates virtually stained images using label-free tissue images,in which different stains are merged following a micro-structure map defined by the *** approach uses a single deep neural network that receives two different sources of information as its input:(1)autofluorescence images of the label-free tissue sample and(2)a“digital staining matrix”,which represents the desired microscopic map of the different stains to be virtually generated in the same tissue *** digital staining matrix is also used to virtually blend existing stains,digitally synthesizing new histological *** trained and blindly tested this virtual-staining network using unlabelled kidney tissue sections to generate micro-structured combinations of haematoxylin and eosin(h&E),Jones’silver stain,and Masson’s trichrome *** a single network,this approach multiplexes the virtual staining of label-free tissue images with multiple types of stains and paves the way for synthesizing new digital histological stains that can be created in the same tissue cross section,which is currently not feasible with standard histochemical staining methods.

关键词： network rendering synthesis

Capital flows, economic growth and the real effective exchange rate: Evidence from China

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Economic and Political Studies 2023年第1期11卷 123-147页

作者： Xin Tian Jakob de haan Yanping Zhao Faculty of Economics and Business University of GroningenGroningenthe Netherlands CESifo MunichGermany School of Economics Ocean University of ChinaQingdaoChina Institute of Marine Economy Ocean University of ChinaQingdaoChina

This paper examines the Granger causal relationship between capital flows and economic growth in China over the period 1998Q1–2019Q2,allowing for real effective exchange rate(REER)*** parameter instability tests indicate structural changes,we use bootstrap rolling window causality tests,which suggest that the causal nexus between capital flows and GDP growth is *** find that the causal links between foreign direct investments(FDIs)and GDP growth are hardly affected by the REER,whereas the REER plays a more important role in affecting the causal connections between portfolio investments and other investments and GDP *** results suggest that cumulative portfolio inflows and cumulative other investment inflows harm GDP growth,whereas cumulative portfolio outflows and cumula-tive other investment outflows positively affect GDP growth.

关键词： Capital flows real effective exchange rate GDP growth rate bootstrap Granger causality test parameter instability test time-varying causality

Novel and Simple Calorimetric Methods for Quantifying Losses in Magnetic Core and GaN Transistor in a high Frequency Boost Converter

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Chinese Journal of Electrical Engineering 2016年第2期2卷 68-75页

作者： wenbo wang Frans Pansier Sjoerd de haan J.A.Ferreira DCE&S Faculty of Electrical EngineeringMathematics and Computer ScienceDelft University of TechnologyDelftThe Netherlands

In design and implementation of a boost converter,information on loss characteristics of switching devices and magnetic materials is a prerequisite,especially in high frequency *** gather such information,testing and accurate loss quantification is *** methods for measuring magnetic core loss are either only suitable for sinusoidal wave excitations or cannot separate winding loss from inductor *** addition,existing loss measurement approaches on the newly introduced GaN transistors are not *** this paper,we present a new method to distinguish winding loss from inductor loss under practical *** method utilizes a converter to generate the actual excitation waveforms and uses a calorimetric setup to quantify the *** splitting up the inductor in a converter into an air-core inductor and a magnetic-core inductor,both equipped with exactly the same winding structure,the air-core inductor loss can be used as the reference of the magnetic-core inductor winding *** this way,losses in the magnetic core can be determined in the actual operating condition of a converter in which the inductor is to be ***,a simple calorimetric approach for obtaining loss information of GaN transistors are is also *** methods require simple setup and are easy and convenient to *** methods work well in assessing different high frequency magnetic core materials and measuring losses in GaN transistors at 1Mhz.

关键词： Core loss measurement practical excitation high frequency magnetic material practical excitation transistor loss measurement calorimetric method

Reactive Extraction of Alcohols from Apolar hydrocarbons with Aqueous Solutions

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Tsinghua Science and Technology 2006年第2期11卷 222-227页

作者： Boris Kuzmanovi Norbert J. M. Kuipers André B. de haan Gerard Kwant Akzo Nobel Chemicals Research Arnhem The Netherlands University of Twente Enschede The Netherlands DSM Research Geleen The Netherlands

The aqueous solutions are evaluated as sustainable reactive extraction solvents for the recovery of monohydroxyl alcohols （benzyl alcohol, 1-hexanol, cyclohexanol） present in few-percent concentrations in apolar hydrocarbons （toluene, n-hexane, and cyclohexane） by considering two approaches. An aqueous solution containing a reactive extractant, like borate salts, borate complexes, a monosalt of dicarboxylic acid, hydroxypropyl-cyclodextrins, and silver nitrate, shows limited potential to be used. Another approach, in which the alcohol is chemically modified prior to the extraction into an easy-extractable form, in this case a monoester/carboxylic acid, shows much more potential. An environmentally benign aqueous solution of sodium hydrogen carbonate can provide a distribution ratio of benzyl alcohol up to 200, leaving the solubility of the organic solvent in the aqueous solution unchanged relative to pure water and therefore increasing the selectivity with two orders of magnitude. The modification of aromatic, cyclo-aliphatic, and linear aliphatic alcohols can be performed efficiently in the apolar organic solvent without need for a catalyst. The recovery of the modified alcohol can be performed by back-extraction in combination with a spontaneous hydrolysis.

关键词： reactive extraction alcohol polar hydrocarbons

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