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Acetylacetone-TiO_(2) Promoted Large Area Compatible Cascade Electron Transport Bilayer for Efficient Perovskite Solar Cells

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Energy & Environmental Materials 2024年第2期7卷 221-228页

作者： Hyong Joon Lee Jin Kyoung Park Jin Hyuck Heo Sang Hyuk im Department of Chemical and Biological Engineering Korea University145 Anam-ro Seongbuk-guSeoul 17104Korea

In designing efficient perovskite solar cells(PSCs),the selection of suitable electron transport layers(ETLs)is critical to the final device performance as they determine the driving force for selective charge ***_(2)nanoparticles(NPs)based ETLs have been a popular choice for PSCs due to superior electron mobility,but their relatively deep-lying conduction band energy levels(ECB)result in substantial potential ***,TiO_(2)NPs establish favorable band alignment owing to shallower ECB,but their low intrinsic mobility and abundant surface trap sites impede the final *** this reason,constructing a cascaded bilayer ETL is highly desirable for efficient PSCs,as it can rearrange energy levels and exploit on advantages of an individual *** this study,we prepare SnO_(2)NPs and acetylacetone-modified TiO_(2)(Acac-TiO_(2))NPs and implement them as bilayer SnO_(2)/Acac-TiO_(2)(BST)ETL,to assemble cascaded energy band ***_(2)contributes to rapid charge carrier transport from high electron mobility while Acac-TiO_(2)minimizes band-offset and effectively suppresses interfacial ***,the optimized BST ETL generates synergistic influence and delivers power conversion efficiency(PCE)as high as 23.14%with open-circuit voltage(V_(oc))reaching 1.14 ***,the BST ETL is transferred to a large scale and the corresponding mini module demonstrates peak performance of 18.39%PCE from 25 cm^(2)aperture ***,the BST-based mini module exhibit excellent stability,maintaining 83.1%of its initial efficiency after 1000 h under simultaneous 1 Sun light-soaking and damp heat(85℃/RH 85%)environment.

关键词： acetylacetone large area perovskite solar cells TiO_(2)

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Scalp electroacupuncture at the Baihui acupoint (DU 20) improves functional recovery in rats with cerebral ischemia Association with increased expression of vascular endothelial growth factors

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Neural Regeneration Research 2011年第36期6卷 2822-2828页

作者： Min-Wook Kim You Chul Chung Hee Chan Jung Moon-Seo Park Young-Min Han Yong-An Chung Lee-So Maeng Sang-In Park Jiyeon Lim Seung Chan Kim Woo-Seok im Jin Young Chung Minky Kim Manho Kim Institute of Catholic Integrative Medicine (ICim) Incheon St. Mary’s Hospital Catholic University of Korea Incheon Korea Department of Rehabilitation Medicine Catholic University of Korea Seoul Korea Department of Neurology Seoul National University Hospital SNUMRC Seoul Korea Department of Biotechnology Yonsei University Seoul Korea Department of Neurology Seoul Medical Center Seoul Korea

In this study, we induced cerebral infarction in rats by occluding the right middle cerebral artery, and tested the effects of electroacupuncture at the Baihui acupoint （DU 20）. Motor and sensory function was tested using Garcia’s scale and motor weakness grading, and the expression of vascular endothelial growth factor in the brain was quantified using immunoblotting and immunohistochemistry. We found that scalp electroacupuncture at DU 20 significantly improved motor performance and sensory function in rats with stroke, and this was accompanied by an increased expression of vascular endothelial growth factor in the ischemic brain tissue and peri-ischemic area. In addition, Pearson correlation analysis showed that the improvements in functional recovery were correlated with the increased expression of vascular endothelial growth factor.

关键词： electroacupuncture cerebrovascular disorder vascular endothelial growth factor Baihui acupoint functional improvement

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猪真皮胶原膜早期覆盖深Ⅱ度烧伤创面的实验研究

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中华整形烧伤外科杂志 1993年第4期9卷 284-285,319+324页

作者：高智仁 Michael J.im Robert J.Spence 青海医学院附属医院烧伤科 810001 Division of Plastic Surgery The Johns Hopkins University School of Medicine

采用我们先前报道的猪皮胶原提取方法和成膜技术,制成猪真皮胶原膜。在大鼠背部以75℃、15秒,造成4cm×4cm的深Ⅱ度烧伤创面,清除坏死表皮后,治疗组早期覆盖猪真皮胶原膜,对照组创面暴露。伤后10天评定创面愈合情况。结果治疗组明显优... 详细信息

采用我们先前报道的猪皮胶原提取方法和成膜技术,制成猪真皮胶原膜。在大鼠背部以75℃、15秒,造成4cm×4cm的深Ⅱ度烧伤创面,清除坏死表皮后,治疗组早期覆盖猪真皮胶原膜,对照组创面暴露。伤后10天评定创面愈合情况。结果治疗组明显优于对照组(P<0.0001)。显示猪真皮胶原膜对深Ⅱ度烧伤创面有良好的保护作用和促进愈合的作用。

关键词：胶原真皮胶原猪真皮胶原烧伤

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Further antiplasmodial effects of the aqueous extract of cymbopogon citratus stapf (lemon grass) against plasmodium berghei in Swiss albino mice

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Asian Pacific Journal of Tropical Medicine 2008年第3期1卷 7-12页

作者： DV Dapper im Siminialayi OO Ebong Department of Pharmacology Faculty of Basic Medical SciencesCollege of Health SciencesUniversity of Port HarcourtPMB 5323Port HarcourtNigeria Department of Human Physiology and Malaria Research Unit Faculty of Basic Medical SciencesCollege of Health SciencesUniversity of Port HarcourtPMB 5323Port HarcourtNigeria

Lemon grass(Cymbopogon citratus Stapf) is a popular alternative to western medicines for a number of conditions, including fevers,muscle soreness and superficial infections in *** addition to its already reported suppressive effects against *** infection,this study sought to determine its repository and blood schizonticidal activities in established *** infection using Swiss albino mice as *** weighing on average, between 15 and 25g were given 103mg/kg,155mg/kg and 310mg/kg/day of the crude aqueous extract of cymbopogon citratus stapf,in the 4-day test,24-hour Rane test and 72-hour Rane *** effects of these doses of the extract were then compared with chloroquine(5mg/kg/day) and sulphadoxine/pyrimethamine (3mg/kg/day).We report an average percentage suppressive repository activity of 65.8%for the extract at a dose of 310mg/kg and a blood schizonticidal activity that increased from 68.33%in the 24-hour Rane test to 92%in the 72-hour Rane test for the same dose of *** crude aqueous extract of *** stapf thus has significant repository and blood schizonticidal activities against established *** infection in Swiss albino mice compare to that of pyrimethamine and sulphadoxine/pyrimethamine respectively.

关键词： cymbopogon citratus stapf antiplasmodial activity P.berghei

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The effects of methanol extract of cleistopholis patens on the reproductive system of female Wistar rats

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Asian Pacific Journal of Tropical Medicine 2009年第1期2卷 6-12页

作者： Amadi CN Odigie JO Siminialayi im Department of Clinical Pharmacy Faculty of Pharmaceutical SciencesCollege of Health SciencesUniversity of Port HarcourtPMB 5323Port Harcourt Department of Pharmacology College of Health SciencesUniversity of Port HarcourtPMB 5323Port Harcourt

Objective:In Port Harcourt and its environs,extracts of Cleistopholis patens are used by traditional medicine healers for the treatment of menstrual irregularities and other gynaecological *** objective of this study was therefore to determine the effects of orally administered methanol extract of the stem bark of Cleistopholis patens on the reproductive organs of non-pregnant albino(Wistar) ***:3g/kg(low dose) and 6g/kg(high dose) of the extract were administered orally,daily to two different groups of animals,respectively, over a period of 28 days.A third(control) group of animals received distilled water only,orally over the same *** animals from each of the groups were sacrificed on day 8,15 and *** blood samples and reproductive organs respectively were taken from each group of sacrificed animals for hormonal and histopathological ***:Results of the hormonal assay revealed a general increase in the levels of Follicle Stimulating Hormone(FSH),Luteinizing Hormone(LH),progesterone,and *** highest levels were noticed in the animals sacrificed on the 29th day(LH =5.48±0.04 IU/L;FSH =3.80±0.00 IU/ L;Progesterone =7.14±0.15 nmol/L;Estrogen = 0.168±0.002 nmol/L).These increases were statistically significant compared to those of the control animals(LH =2.90±0.00 IU /L;FSH = 1.28±0.02 IU/L; Progesterone = 3.80±0.00 nmol/L;Estrogen = 0.130±0.002 nmol/L;Pime-dependent increase in FSH,LH,progesterone and estrogen *** postulate that these observed effects may have been induced by the phytoestrogens (known to have 1/1 000 th of the efficacy of natural oestrogens) in the *** hormonal and histopathological c

关键词： Methanol extract Cleistopholis Patens Histopathological Hormonal Effects Female Rats

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Advances in carbon-based thermoelectric materials for high-performance,flexible thermoelectric devices

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Carbon Energy 2021年第5期3卷 667-708页

作者： Jeong-Seob Yun Seongyun Choi Sang Hyuk im Department of Chemical and Biological Engineering Korea UniversitySeongbuk-guSeoulRepublic of Korea

Waste energy harvesting can contribute to the increase of the efficiency of many industrial processes,which consume energy to produce valuable *** all the wasted energy,heat energy is the most abundant,existing in almost any *** devices have the capability to harvest and convert the thermal energy into electrical power via the Seebeck *** its simple operating principle,thermoelectric devices can be reliable even under the harshest environments,taking advantage of any type of heat *** a result,various inorganic and organic materials are being explored as thermoelectric *** the reported materials,carbon-based materials are promising in terms of commericialization,due to their nontoxic and abundant nature,and solution *** particular,poly(3,4-ethylenedioxythiophene):polystyrene sulfonate(PEDOT:PSS),carbon nanotubes,and graphene are extensively studied as thermoelectric materials owing to their remarkable thermoelectric ***,organic-inorganic hybrid halide perovskites show the potential to be used as future high-performance thermoelectric ***,the progess in carbon materials as thermoelectrics is reviewed in detail,focusing on four base materials(PEDOT:PSS,carbon nanotubes,graphene,and organic-inorganic hybrid halide perovskites).This review illuminates the potential of carbon-based materials in the field of thermoelectrics and their application to next-generation energy devices.

关键词： carbon materials carbon nanotubes graphene halide perovskites PEDOT:PSS thermoelectrics

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SYNCRIP controls miR-137 and striatal learning in animal models of methamphetamine abstinence

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Acta Pharmaceutica Sinica B 2022年第8期12卷 3281-3297页

作者： Baeksun Kim Sung Hyun Tag Eunjoo Nam Suji Ham Sujin Ahn Juhwan Kim Doo-Wan Cho Sangjoon Lee Young-Su Yang Seung Eun Lee Yong Sik Kim Il-Joo Cho Kwang Pyo Kim Su-Cheol Han Heh-In im Convergence Research Center for Diagnosis Treatment and Care System of Dementia(DTC)Korea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea Division of Bio-Medical Science&Technology KIST SchoolKorea University of Science and Technology(UST)Seoul 02792Republic of Korea Center for Neuroscience KISTSeoul 02792Republic of Korea Animal Model Research Center Jeonbuk Department of Inhalation ResearchKorea Institute of Toxicology(KIT)Korea Research Institute of Chemical Technology(KRICT)Jeongeup 56212Republic of Korea Research Animal Resource Center KISTSeoul 02792Republic of Korea Department of Pharmacology Seoul National University College of MedicineSeoul 03080Republic of Korea Center for BioMicrosystems KISTSeoul 02792Republic of Korea Department of Applied Chemistry Kyung Hee UniversityGyeonggi-do 17104Republic of Korea

Abstinence from prolonged psychostimulant use prompts stimulant withdrawal *** adaptations within the dorsal striatum have been considered the main hallmark of stimulant abstinence. Here we explored striatal miRNA-target interaction and its impact on circulating miRNA marker as well as behavioral dysfunctions in methamphetamine(MA) abstinence. We conducted miRNA sequencing and profiling in the nonhuman primate model of MA abstinence, followed by miRNA qPCR,LC-MS/MS proteomics, immunoassays, and behavior tests in mice. In nonhuman primates, MA abstinence triggered a lasting upregulation of miR-137 in the dorsal striatum but a simultaneous downregulation of circulating miR-137. In mice, aberrant increase in striatal miR-137-dependent inhibition of SYNCRIP essentially mediated the MA abstinence-induced reduction of circulating miR-137. Pathway modeling through experimental deduction illustrated that the MA abstinence-mediated downregulation of circulating miR-137 was caused by reduction of SYNCRIP-dependent miRNA sorting into the exosomes in the dorsal striatum. Furthermore, diminished SYNCRIP in the dorsal striatum was necessary for MA abstinence-induced behavioral bias towards egocentric spatial learning. Taken together, our data revealed circulating miR-137 as a potential blood-based marker that could reflect MA abstinence-dependent changes in striatal miR-137/SYNCRIP axis, and striatal SYNCRIP as a potential therapeutic target for striatum-associated cognitive dysfunction by MA withdrawal syndrome.

关键词： Methamphetamine Abstinence Withdrawal Striatum miR-137 SYNCRIP Biomarker Behavior

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Envy-Free Pricing with General Supply Constraints for Unit Demand Consumers

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Journal of Computer Science & Technology 2012年第4期27卷 702-709页

作者： Sungjin im 陆品燕王亚军 Department of Computer Science University of Illinois Microsoft Research Asia ACM

The envy-free pricing problem can be stated as finding a pricing and allocation scheme in which each consumer is allocated a set of items that maximize his/her utility under the pricing. The goal is to maximize seller revenue. We study the problem with general supply constraints which are given as an independence system defined over the items. The constraints, for example, can be a number of linear constraints or matroids. This captures the situation where items do not pre-exist, but are produced in reflection of consumer valuation of the items under the limit of resources. This paper focuses on the case of unit-demand consumers. In the setting, there are n consumers and rn items; each item may be produced in multiple copies. Each consumer i ∈[n] has a valuation vij on item j in the set Si in which he/she is interested. He/she must be allocated （if any） an item which gives the maximum （non-negative） utility. Suppose we are given an a-approximation oracle for finding the maximum weight independent set for the given independence system （or a slightly stronger oracle）; for a large number of natural and interesting supply constraints, constant approximation algorithms are available. We obtain the following results. 1） O（αlogn）-approximation for the general case. 2） O（ακ）-approximation when each consumer is interested in at most k distinct types of items. 3） O（αf）-approximation when each type of item is interesting to at most f consumers. Note that the final two results were previously unknown even without the independence system constraint.

关键词： envy-free pricing approximation matroid

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Detection of stacking orientation error of CFRP composite laminates using ultrasound waves

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中国有色金属学会会刊：英文版 2009年第B09期19卷 124-127页

作者： Sun-Kyu Kim David HSU Young-Hwan SEO Kwang-Hee im Division of Mechanical System Engineering Chonbuk National University Center for Nondestructive Evaluation Iowa State University Department of Physical Education Chosun University Department of Automotive Engineering Woosuk University

A jig was developed for generating a shear wave. A pyramid with an isosceles triangle with two 45o was made of aluminum to generate shear waves using two longitudinal transducers based on ultrasonic-polarized mechanism. Also, the signal splitter was connected to the pulser jack on the pulser/receiver and to the longitudinal transducers. Therefore, an experimental way was performed in order to make shear wave on the bottom of aluminum alloyed pyramid. Also, a jig was manufactured and developed for generating a shear wave based on the computer numerical simulation. It is found that the experimentally shear wave variation of newly-designed jig is consistent with computer numerical simulation results and shear wave ultrasonic application can be very useful to detect the defects in CFRP composites.

关键词：碳纤维复合材料误差检测超声波复合材料层板计算机数值模拟堆垛脉冲发生器信号分配器

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Distributed Virtual Inertia Based Control of Multiple Photovoltaic Systems in Autonomous Microgrid

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IEEE/CAA Journal of Automatica Sinica 2017年第3期4卷 512-519页

作者： Won-Sang im Cheng Wang Wenxin Liu Liming Liu Jang-Mok Kim Lehigh University IEEE ABB Inc. Pusan National University

The large inertia of a traditional power system slows down system's frequency response but also allows decent time for controlling the *** an autonomous renewable microgrid usually has much smaller inertia,the control system must be very fast and accurate to fight against the small inertia and *** reduce the demanding requirements on control,this paper proposes to increase the inertia of photovoltaic(PV) system through inertia *** inertia emulation is realized by controlling the charging/discharging of the direct current(DC)-link capacitor over a certain range and adjusting the PV generation when it is feasible and/or *** well designing the inertia,the DC-link capacitor parameters and the control range,the negative impact of inertia emulation on energy efficiency can be *** proposed algorithm can be integrated with distributed generation setting algorithms to improve dynamic performance and lower implementation *** studies demonstrate the effectiveness of the proposed solution.

关键词： Inertia emulation microgrid photovoltaic system renewable energy voltage source converter

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