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Modeling challenges and potential solutions for integration of emerging DERs in DMS applications: power flow and short-circuit analysis

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Journal of Modern Power Systems and Clean Energy 2019年第6期7卷 1365-1384页

作者： luka v.strezoski Nikola R.vOJNOvIC vladimir C.strezoski Predrag M.vIDOvIC Marija D.PRICA Kenneth A.LOPARO Case School of Engineering Case Western Reserve UniversityClevelandUSA Faculty of Technical Sciences University of Novi SadNovi SadSerbia

We aim to systematically review challenges imposed by emerging distributed energy resources(DERs)to model in two basic distribution management system(DMS)online applications—power flow and short-circuit analysis,as well as to offer a systematic review of potential *** the last decade,electronically coupled DERs became increasingly *** can employ a wide range of control strategies for power,current,or voltage control,in both normal and faulted ***,DERs cannot be modeled with the traditional PQ(load or generator bus)or Pv(generator bus)bus types used for modeling synchronous and induction machines in online power flow ***,since fault currents of DERs are limited to predefined maximal values,electronically coupled DERs cannot be represented with traditional voltage source behind impedance models for online short-circuit calculation(SCC).However,most of the DMS software packages still use the traditional models to represent all DER types,including those that are electronically *** paper shows that there will be large calculation errors in such practice,which make the system model an inadequate representation of the *** will lead to serious errors in the management,control,and operation of distribution ***,potential solutions to the challenges are systematically ***,the calculation results on a distribution test system with all DER types are used to prove the claim.

关键词： Distributed energy resources(DERs) Distribution management system(DMS) Power flow modeling Short-circuit modeling

Solid-state impedance spectroscopy studies of dielectric properties and relaxation processes in Na_(2)O–v_(2)O_(5)–Nb_(2)O_(5)–P_(2)O_(5) glass

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International Journal of Minerals,Metallurgy and Materials 2024年第1期31卷 186-196页

作者： Sara Marijan luka Pavic Division of Materials Chemistry Ruđer Boskovic InstituteBijenicka 54HR-10000 ZagrebCroatia

Solid-state impedance spectroscopy(SS-IS)was used to investigate the influence of structural modifications resulting from the addition of Nb2O5 on the dielectric properties and relaxation processes in the quaternary mixed glass former(MGF)system 35Na_(2)O–10v_(2)O_(5)–(55-x)P_(2)O_(5)–xNb_(2)O_(5)(x=0–40,mol%).The dielectric parameters,including the dielectric strength and dielectric loss,are determined from the frequency and temperature-dependent complex permittivity data,revealing a significant dependence on the Nb2O5 *** transition from a predominantly phosphate glass network(xved trend in the direct-cur-rent(DC)*** the predominantly niobate network(x≥25,region III),the highly polarizable nature of Nb5+ions leads to a fur-ther increase in the dielectric permittivity and dielectric *** is particularly evident in Nb-40 glass-ceramic,which contains Na_(13)Nb_(35)O_(94) crystalline phase with a tungsten bronze structure and exhibits the highest dielectric permittivity of 61.81 and the lowest loss factor of 0.032 at 303 K and 10 *** relaxation studies,analyzed through modulus formalism and complex impedance data,show that DC conductivity and relaxation processes are governed by the same mechanism,attributed to ionic *** contrast to glasses with a single peak in frequency dependence of imaginary part of electrical modulus,M″(ω),Nb-40 glass-ceramic exhibits two distinct contributions with similar relaxation *** high-frequency peak indicates bulk ionic conductivity,while the additional low-fre-quency peak is associated with the grain boundary effect,confirmed by the electrical equivalent circuit(EEC)*** scaling characteristics of permittivity and conductivity spectra,along with the electrical modulus,validate time-temperature superposition and demonstrate a

关键词： phosphate glasses glass-ceramics impedance spectroscopy dielectric properties relaxation processes permittivity scaling conductivity scaling modulus formalism

Improving surface integrity when drilling CFRPs and Ti-6Al-4v using sustainable lubricated liquid carbon dioxide

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Chinese Journal of Aeronautics 2023年第7期36卷 129-146页

作者： In˜igo RODRIGUEZ Pedro Jose´ARRAZOLA Mikel CUESTA luka STERLE Franci PUSˇAvEC Faculty of Engineering Mondragon UnibertsitateaArrasate-Mondragon 20500Spain Faculty of Mechanical Engineering University of LjubljanaLjubljana 1000Slovenia

In the quest for decreasing fuel consumption and resulting gas emissions in the aeronautic sector,lightweight materials such as Carbon Fiber Reinforced Polymers(CFRPs)and Ti-6Al-4v alloys are being *** materials,with excellent weight-to-strength ratios,are widely used for structural applications in aircraft *** date,several studies have been published showing that the use of metalworking fluids(MWFs),special tool geometries,or advanced machining techniques is required to ensure a surface quality that meets aerospace component *** MWFs pose a number of environmental and worker health hazards and also degrade the mechanical properties of CFRPs due to water absorption in the ***,a transition to more environmentally friendly cooling/lubrication techniques that prevent moisture problems in the composite is *** research shows that lubricated LCO_(2) is a viable option to improve the quality of drilled CFRP and titanium aerospace components compared to dry machining,while maintaining clean work *** results show that the best combination of tool geometry and cooling conditions for machining both materials is drilling with Brad point drills and lubricated LCO_(2).Drilling under these conditions resulted in a 90%improvement in fiber pullout volume compared to dry machined CFRP *** addition,a 33% reduction in burr height and a 15% improvement in surface roughness were observed compared to dry drilling of titanium.

关键词： Carbon fibers Cryogenics Green manufacturing Machining Solid lubricants Surface morphology Titanium alloys

靶向性自杀基因治疗系统联合放射线治疗前列腺癌移植瘤的实验研究

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中华放射肿瘤学杂志 2007年第1期16卷 55-58页

作者：陆雪官 MILAS luka 苏州大学附属第二医院肿瘤放射治疗科 215004 美国德州大学MD Anderson肿瘤中心实验放射肿瘤学系

目的初步判断针对整合素αv的靶向性自杀基因治疗系统（RGD-4C AAvP HSv-TK／GCv）是否能提高前列腺癌细胞株DU145移植瘤的放射效应。方法建立移植性前列腺癌细胞株DU145的裸鼠肿瘤模型48只。当位于每只裸鼠右大腿的肿瘤直径达6．0mm（5... 详细信息

目的初步判断针对整合素αv的靶向性自杀基因治疗系统（RGD-4C AAvP HSv-TK／GCv）是否能提高前列腺癌细胞株DU145移植瘤的放射效应。方法建立移植性前列腺癌细胞株DU145的裸鼠肿瘤模型48只。当位于每只裸鼠右大腿的肿瘤直径达6．0mm（5．8-6．3mm）时，开始实验。实验共分成6组（每组8只），分别为对照组、单纯放射组、单纯RGD-4C AAvP HSv-TK／GCv组（RGD-4C组）、单纯AAvP HSv-TK／GCv组（无RGD-4C组）、RGD-4C AAvP HSv-TK／GCv联合放射组（XRT＋RGD-4C组）和AAvP HSv-TK／GCv联合放射组（XRT＋无RGD-4C组）。观察指标为肿瘤生长延迟时间（肿瘤从6．0mm生长至12．0mm所需时间）和肿瘤治愈情况。结果除5只在实验过程中死亡外，单纯放射组、RGD-4C组、无RGD-4C组各有1只和XRT＋RGD-4C组3只肿瘤被治愈。统计分析余下37只肿瘤生长情况发现，RGD-4C组、无RGD-4C组和单纯放射组的绝对延迟时间分别为（24．4±9．0）、（22．6±11．3）和（28．3±5．5）d；当RGD-4C AAvP HSv-TK／GGv和AAvP HSv-TK／GCv分别联合放射时，其绝对延迟时间分别为（64．7±23．8）和（35．4士9．6）d，而标准化的延迟时间则分别为（40．3±23．8）和（12．8±9．6）d，它们对放射的增益因子分别为1．42和0．45。结论针对整合素αv的靶向性自杀基因治疗系统RGD-4C AAvP HSv-TK／GCv能显著提高前列腺癌细胞株DU145移植瘤的放射效应，值得进一步研究。

关键词：细胞系前列腺肿瘤移植肿瘤放射靶向性自杀基因治疗整合素αv

Hybrid Power Supply System with Fuzzy Logic Controller: Power Control Algorithm, Main Properties, and Applications

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Journal of Modern Power Systems and Clean Energy 2022年第4期10卷 923-931页

作者： Dragana J.Petrović Miroslav M.Lazić Bojana v.JovanovićLazić Branko D.Blanuša Stanko O.Aleksić Department of Power Electronics Iritel a.d.BelgradeBelgradeSerbia Department of Power Electronics Faculty of Electrical Engineering University of Banja LukaBanja LukaSerbian

This paper presents a novel power supply system based on the use of fuzzy inference logic to improve the power control of renewable energy *** system comprises renewable solar and wind sources,and an accumulator battery is used as an additional power *** procedure for the parallel connection of multiple energy sources provides a stable power supply and optimal charging of the accumulative *** energy sources are connected in parallel using two serial converters and controlled by the controller based on the fuzzy *** reference voltage control of the serial converter enables an optimal use of available energy *** accumulative element is connected in parallel to compensate for the shortage of solar and wind energies,whereas if the available renewable energy exceeds the needs of the consumers,the surplus energy is accumulated in the *** measurements are conducted on the prototype of the hybrid power system under real conditions and compared with the applied systems of this *** novel system is mainly used in remote telecom locations where there is no power distribution network.

关键词： Fuzzy logic hybrid power source power supply parallel operation serial converter

B7 homologue 3 as a prognostic biomarker and potential therapeutic target in gastrointestinal tumors

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World Journal of Gastrointestinal Oncology 2021年第8期13卷 799-821页

作者： Petar Rasic Maja Jovanovic-Tucovic Marija Jeremic Slavisa M Djuricic Zorica v vasiljevic Maja Milickovic Djordje Savic Department of Abdominal Surgery Mother and Child Health Care Institute of Serbia“Dr.Vukan Cupic”Belgrade 11000Serbia Institute of Medical and Clinical Biochemistry School of MedicineUniversity of BelgradeBelgrade 11000Serbia Department of Clinical Pathology Mother and Child Health Care Institute of Serbia“Dr.Vukan Cupic”Belgrade 11000Serbia Faculty of Medicine University of Banja LukaBanja Luka 78000Bosnia and Herzegovina Department of Clinical Microbiology Mother and Child Health Care Institute of Serbia“Dr.Vukan Cupic”Belgrade 11000Serbia School of Medicine University of BelgradeBelgrade 11000Serbia

The most common digestive system(DS)cancers,including tumors of the gastrointestinal tract(GIT)such as colorectal cancer(CRC),gastric cancer(GC)and esophageal cancer(EC)as well as tumors of DS accessory organs such as pancreatic and liver cancer,are responsible for more than one-third of all cancerrelated deaths worldwide,despite the progress that has been achieved in anticancer *** to these limitations in treatment strategies,oncological research has taken outstanding steps towards a better understanding of cancer cell biological complexity and *** studies led to new molecular target-driven therapeutic *** in vivo and in vitro studies have revealed significant expression of B7 homologue 3(B7-H3)among the most common cancers of the GIT,including CRC,GC,and EC,whereas B7-H3 expression in normal healthy tissue of these organs was shown to be absent or *** molecule is able to influence the biological behavior of GIT tumors through the various immunological and nonimmunological molecular mechanisms,and some of them are shown to be the result of B7-H3-related induction of signal transduction pathways,such as Janus kinase 2/signal transducer and activator of transcription 3,phosphatidylinositol 3-kinase/protein kinase B,extracellular signal-regulated kinase,and nuclear factor-κB.B7-H3 exerts an important role in progression,metastasis and resistance to anticancer therapy in these *** addition,the results of many studies suggest that B7-H3 stimulates immune evasion in GIT tumors by suppressing antitumor immune ***,it was observed that experimental depletion or inhibition of B7-H3 in gastrointestinal cancers improved antitumor immune response,impaired tumor progression,invasion,angiogenesis,and metastasis and decreased resistance to anticancer ***,the high expression of B7-H3 in most common cancers of the GIT was shown to be associated with poor *** this review,we summarize the est

关键词： B7 homologue 3 Gastrointestinal tumors Colorectal cancer Gastric cancer Esophageal cancer Targeted therapy