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Advancements in the development of liquid organic hydrogen carrier systems and their applications in the hydrogen economy

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Progress in Natural Science:Materials International 2024年第5期34卷 825-839页

作者： Alexis Munyentwali khai chen tan Teng He Dalian Institute of Chemical Physics Chinese Academy of Sciences Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences

The transition towards sustainable and clean energy systems has become a significant concern in the modern world. Hydrogen has the potential to meet the growing energy demands while addressing greenhouse gas emissions. However, one major obstacle in utilizing hydrogen as a fuel is the lack of efficient and cost-effective storage methods. In this regard, liquid organic hydrogen carriers(LOHCs) offer several advantages, including high hydrogen storage capacity, improved safety compared to traditional storage methods, and the ability to transport hydrogen using existing liquid fuels' infrastructure. This review summarizes advancements in the development of LOHC systems for hydrogen storage, with a focus on the latest and innovative systems such as those based on dehydrogenative coupling reactions, renewable LOHCs from lignocellulosic biomass, and the development of LOHCs from plastic waste recycling. In addition to the material aspect, this contribution also discusses various applications of LOHCs in the broader context of the hydrogen economy, including a recently proposed concept of mixed gas hydrogenation of LOHCs for realizing hydrogen purification and storage in a single process step. By highlighting the main advantages and challenges of each LOHC system and providing future directions in the development of efficient LOHC systems, this review aims to contribute to an extensive understanding and advancement of LOHCs in the evolving hydrogen-based economy.

关键词： Dehydrogenation Hydrogen economy Hydrogen storage Hydrogenation Liquid organic hydrogen carriers (LOHCs)

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吡咯锂的合成、表征及晶体结构

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物理化学学报 2021年第11期37卷 101-106页

作者：荆子君 khai chen tan 何腾于洋裴启俊王金涛 Hui Wu 陈萍中国科学院大连化学物理研究所辽宁大连116023 中国科学院大学北京100049 美国国家标准技术研究所中子研究中心马里兰州盖瑟斯堡20899-6012美国

高效储氢材料的缺乏是制约氢能大规模应用的主要瓶颈之一。有机液态储氢材料是一类具有前景的体系,但是仍然面临吸放氢热力学性质差等难题。作者在前期提出了一种金属取代策略,即碱(土)金属取代有机物中的活泼氢,优化了有机储氢材料的... 详细信息

高效储氢材料的缺乏是制约氢能大规模应用的主要瓶颈之一。有机液态储氢材料是一类具有前景的体系,但是仍然面临吸放氢热力学性质差等难题。作者在前期提出了一种金属取代策略,即碱(土)金属取代有机物中的活泼氢,优化了有机储氢材料的热力学性质。基于此,我们开发了一系列金属有机氢化物储氢材料。然而在这些材料中,金属吡咯盐的合成方法及性质并没有被详细地研究,同时吡咯锂这种新物质的晶体结构尚未解析。在本工作中,我们采用球磨法和湿化学法两种合成方法制备了吡咯锂和吡咯钠两种物质,并利用核磁共振、X射线衍射、紫外可见吸收光谱等技术对材料进行了详细的表征。晶体结构解析发现,吡咯锂为单斜晶系,P2_(1/c)(14)空间群,晶胞参数为a=4.4364(7)A、b=11.969(2)A、c=8.192(2)A、β=108.789(8)°和V=411.8(2)A^(3)。在晶体结构中,每个锂离子被三个吡咯离子包围,其中包括两个Li-N形成的σ键和一种阳离子–π相互作用,并由此形成了三维网络结构。这些特征不同于文献中对咔唑锂的理论预测。

关键词：吡咯锂晶体结构金属取代液态有机储氢材料金属氮杂环化合物储氢

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A review of remote sensing applications for oil palm studies

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Geo-Spatial Information Science 2017年第2期20卷 184-200页

作者： khai Loong Chong Kasturi Devi Kanniah Christine Pohl Kian Pang tan Faculty of Geoinformation and Real Estate Universiti Teknologi MalaysiaJohor BahruMalaysia Centre for Environmental Sustainability and Water Security(IPASA) Research Institute for Sustainable Environment(RISE)Universiti Teknologi MalaysiaJohor BahruMalaysia Institute of Computer Science University of OsnabrueckOsnabrueckGermany

Oil palm becomes an increasingly important source of vegetable oil for its production exceeds soybean,sunflower,and *** growth of the oil palm industry causes degradation to the environment,especially when the expansion of plantations goes *** sensing is a useful tool to monitor the development of oil palm *** order to promote the use of remote sensing in the oil palm industry to support their drive for sustainability,this paper provides an understanding toward the use of remote sensing and its applications to oil palm plantation *** addition,the existing knowledge gaps are identified and recommendations for further research are given.

关键词： Oil palm remote sensing monitoring agriculture mapping sustainability

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A review on current and future advancements for commercialized microalgae species

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Food Science and Human Wellness 2022年第5期11卷 1156-1170页

作者： Jia Fei Wong Hui Jing Hong Su Chern Foo Michelle khai Khun Yap Ji Wei tan School of Science Monash University MalaysiaBandar Sunway 47500Malaysia

Microalgae are unicellular photosynthetic microorganisms that are commonly found in saline or freshwater *** the years,microalgae represent promising sources of sustainable bioactivities with past literatures reflecting a growing interest in algae-based dietary supplements in the form of whole ***,the bioactive molecules that can be identified and extracted in microalgae have scientifically proven to contain therapeutic properties which can be beneficial to human *** the increasing occurrence of global health threats such as antimicrobial resistance and cancer,this has resulted in considerable attention for microalgae study especially in the medicinal *** studies have proved the therapeutic potentials of high-value bioproducts in microalgae,however,there is still room to understand their potential therapeutic properties on humans’health,discovering novel microalgae-derived bioactive compounds,as well as translating the lab-based evidence to clinical trial *** review will focus on accessing the biochemical compositions of commercialised microalgae species from 2007 to 2020,and the activity of their biologically active molecules in eliciting selected therapeutic potentials which are anti-oxidative,anti-inflammatory,anti-microbial and anti-cancer *** review article will also be looking at the research gaps in addition to the above four major selected therapeutic potentials,and future prospective.

关键词： Commercialized microalgae Antioxidant Anti-inflammation Antimicrobial Anticancer

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The electroweak monopole–antimonopole pair in the standard model

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Communications in Theoretical Physics 2024年第3期76卷 113-119页

作者： Dan Zhu khai-Ming Wong Guo-Quan Wong School of Physics Universiti Sains Malaysia11800 USMPenangMalaysia

We present the first numerical solution that corresponds to a pair of Cho–Maison monopoles and antimonopoles(MAPs) in the SU(2) × U(1) Weinberg–Salam(WS) *** monopoles are finitely separated,while each pole carries a magnetic charge ±4π/*** positive pole is situated in the upper hemisphere,whereas the negative pole is in the lower *** Cho–Maison MAP is investigated for a range of Weinberg angles,0.4675≤ tan θ_(W)≤10,and Higgs self-coupling,0 ≤ β ≤ *** magnetic dipole moment(μm) and pole separation(d_(z)) of the numerical solutions are calculated and *** total energy of the system,however,is infinite due to point singularities at the locations of monopoles.

关键词： magnetic monopole Cho-Maison monopole Weinberg-Salam model

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Characterization of Baram and tanjung sands as potential proppants

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Energy Geoscience 2021年第3期2卷 175-180页

作者： Henry Elochukwu Kenneth Kho khai Kiat Department of Petroleum Engineering Curtin UniversityCDT25098009MiriSarawakMalaysia

Baram and tanjung sands were evaluated for potential use as *** was conducted on Baram and tanjung sands following ISO and ASTM recommended *** showed that Baram and tanjung sand mineralogy is predominantly quartz with presence of metal *** descriptors of both sands for sphericity and roundness were above *** sand was retained by 20/40 mesh size with mean size of 448.2 mm,bulk density of 1.32 g/cc,acid solubility of 1.5%and crush resistance of 4000 *** tanjung sand was retained by 30/50 mesh size with mean size of 383.2 mm,bulk density of 1.30 g/cc,acid solubility of 1.20%and crush resistance of 8000 *** indicates that Baram sand has larger grain size that supports high permeability at low closure stress,making this sand suitable for shallow depth hydraulic fracturing operations,whereas tanjung sand is more suitable for deeper domains with high closure *** results and economic comparison with commercial frac sand and other proppant types support using Baram and tanjung sands as potential proppants.

关键词： Baram sand tanjung sand Crush resistance Proppant Hydraulic fracturing

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CRL： Efficient Concurrent Regeneration Codes with Local Reconstruction in Geo-Distributed Storage Systems

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Journal of Computer Science & Technology 2018年第6期33卷 1140-1151页

作者： Quan-Qing Xu Wei-Ya Xi khai Leong Yong Chao Jin Institute of High Performance Computing Agency for Science Technology and Research Singapore 138632 Singapore Data Storage Institute Agency for Science Technology and Research Singapore 138632 Singapore Institute for Infocomm Research Agency for Science Technology and Research Singapore 138632 Singapore

As a typical erasure coding choice, Reed-Solomon （RS） codes have such high repair cost that there is a penaltyfor high reliability and storage efficiency, thereby they are not suitable in geo-distributed storage systems. We present anovel family of concurrent regeneration codes with local reconstruction （CRL） in this paper. The CRL codes enjoy threebenefits. Firstly, they are able to minimize the network bandwidth for node repair. Secondly, they can reduce the numberof accessed nodes by calculating parities from a subset of data chunks and using an implied parity chunk. Thirdly, they arefaster than existing erasure codes for reconstruction in geo-distributed storage systems. In addition, we demonstrate howthe CRL codes overcome the limitations of the Reed-Solomon codes. We also illustrate analytically that they are excellent inthe trade-off between chunk locality and minimum distance. Furthermore, we present theoretical analysis including latencyanalysis and reliability analysis for the CRL codes. By using quantity comparisons, we prove that CRL（6, 2, 2） is only0.657x of Azure LRC（6, 2, 2）, where there are six data chunks, two global parities, and two local parities, and CRL（10,4, 2） is only 0.656x of HDFS-Xorbas（10, 4, 2）, where there are 10 data chunks, four local parities, and two global paritiesrespectively, in terms of data reconstruction times. Our experimental results show the performance of CRL by conductingperformance evaluations in both two kinds of environments： 1） it is at least 57.25% and 66.85% more than its competitorsin terms of encoding and decoding throughputs in memory, and 2） it has at least 1.46x and 1.21x higher encoding anddecoding throughputs than its competitors in JBOD （Just a Bunch Of Disks）. We also illustrate that CRL is 28.79% and30.19% more than LRC on encoding and decoding throughputs in a geo-distributed environment.

关键词： concurrent regeneration code local reconstruction geo-distributed storage system

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Model Reduction by Generalized Falk Method for Efficient Dedicated to Professor Karl Stark Pister for his 95th birthday Field-Circuit Simulations

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Computer Modeling in Engineering & Sciences 2021年第12期129卷 1441-1486页

作者： Loc Vu-Quoc Yuhu Zhai khai D.T.Ngo Aerospace Engineering University of Illinois at Urbana-ChampaignIllinois61801USA Princeton Plasma Physics Laboratory PrincetonNew Jersey08542-0451USA Electrical and Computer Engineering Virginia TechVirginia24061USA

The Generalized Falk Method(GFM)for coordinate transformation,together with two model-reduction strategies based on this method,are presented for efficient coupled field-circuit *** model-reduction strategy is based on a decision to retain specific linearly-independent vectors,called trial vectors,to construct a vector basis for coordinate *** reduced-order models are guaranteed to be stable and passive since the GFM is a congruence transformation of originally symmetric positive definite *** also show that,unlike the Pade-via-Lanczos(PVL)method,the GFM does not generate unstable positive poles while reducing the order´of circuit ***,the proposed GFM is also faster when compared to methods of the type Lanczos(or Krylov)that are already widely used in circuit simulations for electrothermal and electromagnetic *** concept of response participation factors is introduced for the selection of the trial vectors in the proposed model-reduction ***,we present methods to develop simple equivalent circuit networks for the field component of the overall field-circuit *** implementation of these equivalent circuit networks in circuit simulators is *** the proposed model-reduction strategies,significant improvement on the efficiency of the generalized Falk method is illustrated for coupled field-circuit problems.

关键词： Nonlinear circuits power electronics IGBT MOSFET model-order reduction modeling module generation power modeling and estimation electrothermal simulation

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On recommendation-aware content caching for 6G:An artificial intelligence and optimization empowered paradigm

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Digital Communications and Networks 2020年第3期6卷 304-311页

作者： Yaru Fu khai Nguyen Doan Tony Q.S.Quek The School of Science and Technology The Open University of Hong Kong(OUHK)KowloonHong KongChina Information Systems Technology and Design Singapore University of Technology and Design487372Singapore

Recommendation-aware Content Caching(RCC)at the edge enables a significant reduction of the network latency and the backhaul load,thereby invigorating ubiquitous latency-sensitive innovative ***,the effectiveness of RCC strategies is highly dependent on explicit information as regards subscribers’content request patterns,the sophisticated caching placement policy,and the personalized recommendation *** this article,we investigate how the potentials of Artificial Intelligence(AI)and optimization techniques can be harnessed to address those core issues and facilitate the full implementation of RCC for the upcoming intelligent 6G *** this end,we first elaborate on the hierarchical RCC network ***,the devised AI and optimization empowered paradigm is introduced,whereas AI and optimization techniques are leveraged to predict the users’content preferences in real-time situations with the assistance of their historical behavior data and determine the cache pushing and recommendation decision,*** extensive case studies,we validate the effectiveness of AI-based predictors in estimating users’content preference and the superiority of optimized RCC policies over the conventional *** last,we shed light on the opportunities and challenges in the future.

关键词： Artificial intelligence Content caching Optimization techniques Recommendation 6G

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Fabrication and Characterization of Superhydrophobic and Highly Oleophobic Silk Fabrics

Fabrication and Characterization of Superhydrophobic and Hig...

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作者： DO khai LY 浙江理工大学

学位级别：硕士

Superhydrophobicity and oleophobicity which have been discovered from natural world are definitely anticipated to be beneficial for a large number of practical applications Imitation of nature has been the most appreciable way to develop the structural properties for coating fabrication,due to millions of creatures including botanical,insect and zoological species,which have the ability to be resistant from water and low surface tension *** robust superhydrophobic and oleophobic coatings refer to the surface modification of optical materials in order to fabricate the surface roughness and reduce the low surface energy,that lead to water and oil repellent properties with several practical and industrial ***,many publications have presented the preparation strategies of superhydrophobic and oleophobic surface for textile ***,there is a lack of ideal coating approach for superhydrophobic and oleophobic silk ***,these techniques have the disadvantage of complicated procedure,time consuming,use of toxic chemicals,high cost for experiments and low *** this master thesis,simple approaches to prepare fluorine-free superhydrophobic coating and highly hydrophobic and oleophobic coating for silk textile fabrics based on SiO2 nanoparticles and low surface energy agents are ***2 nanoparticles has naturally hydrophilic features and were functionalized by fluorine-free and/or fluorinated *** to experiment works,we successfully prepared the superhydrophobic silk fabric with water contact angle（WCA）of 152.0° and water sliding angle（WSA）of 4.2°,and highly hydrophobic silk fabric with WCA of 149.5°,which is extremely near to superhydrophobic ***,by the introduction of fluorinated silane,oleophobicity has been developed and oil contact angle（OCA）of modified silk fabric reached 132.0°.Effects of different particle sizes of SiO2 nanoparticles,concentration of chemicals in modificatio

关键词： Superhydrophobic Oleophobic Silkfabric Silicananoparticles Laundering durability

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