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用直流电测深和甚低频法确定地下水的污染状况

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地质科学译丛 1997年第3期14卷 54-56,64页

作者： alvin k.benson 师学明 Brigham Young University Department of Geology and GeophysicsProvoUT 84602

地球物理方法可以有效地用来检测土壤和地下水的污染情况。近来在美国犹他州犹他县采用了电阻率测深法和甚低频法来检测浅层油气污染。以前所打的监测井为分析地下水的化学组分及性质提供了极大的方便,同时也为地球物理数据的解释提供... 详细信息

地球物理方法可以有效地用来检测土壤和地下水的污染情况。近来在美国犹他州犹他县采用了电阻率测深法和甚低频法来检测浅层油气污染。以前所打的监测井为分析地下水的化学组分及性质提供了极大的方便,同时也为地球物理数据的解释提供了辅助信息。将电阻率测深数据、甚低频观测数据和测井资料综合起来,勾划出本区电阻率的剖面分布图和平面分布图,从而圈出高电阻率的油气污染区。

关键词：直流电测深甚低频油气污染地下水污染状况

Health awareness and lifestyle toward healthcare-seeking behavior among students in Universitas Advent Indonesia

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Frontiers of Nursing 2024年第3期11卷 337-342页

作者： alvin Salim Natasha Ulima Sianturi Evi Martha Suryani Yunus Elon Nursing Department Riau Andalan Pulp&PaperRiauIndonesia Faculty of Nursing Binawan UniversityJakartaIndonesia Nursing Department UNAI ClinicBandungIndonesia Faculty of Nursing Universitas Advent IndonesiaBandungIndonesia

Objective:Healthcare-seeking behavior(HSB)would affect the prevalence of morbidity and *** are various factors that affect one's *** study aimed to determine if health awareness and lifestyle might relate to ***:A cross-sectional study was applied by using three questionnaires to determine par ticipants'health awareness,lifestyle,and *** study took place in Universitas Advent Indonesia and the students were recruited to be par ***:There were 39 par ticipants joined in this *** of the par ticipants were females,third-year students,and from Accounting *** all participants were aware of their low risk of health issues,had a fine lifestyle,and had moderate ***:One's urge to seek health care facilities was not related to their health awareness and *** was no fur ther study to contradict with this finding at this moment.

关键词： health awareness healthcare-seeking behavior healthcare service utilization lifestyle public health

Targeting TrkB–PSD-95 coupling to mitigate neurological disorders

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Neural Regeneration Research 2025年第3期20卷 715-724页

作者： Xin Yang Yu-Wen alvin Huang John Marshall Department of Molecular Biology Cell Biology and BiochemistryBrown UniversityProvidenceRIUSA Department of Neurology Warren Alpert Medical School of Brown UniversityProvidenceRIUSA Center for Translational Neuroscience Robert J.and Nancy D.Carney Institute for Brain Science and Brown Institute for Translational ScienceBrown UniversityProvidenceRIUSA

Tropomyosin receptor kinase B(TrkB)signaling plays a pivotal role in dendritic growth and dendritic spine formation to promote learning and *** activity-dependent release of brain-derived neurotrophic factor at synapses binds to pre-or postsynaptic TrkB resulting in the strengthening of synapses,reflected by long-term ***,the association of postsynaptic density protein-95 with TrkB enhances phospholipase Cγ-Ca^(2+)/calmodulin-dependent protein kinaseⅡand phosphatidylinositol 3-kinase-mechanistic target of rapamycin signaling required for long-term *** this review,we discuss TrkB-postsynaptic density protein-95 coupling as a promising strategy to magnify brain-derived neurotrophic factor signaling towards the development of novel therapeutics for specific neurological disorders.A reduction of TrkB signaling has been observed in neurodegenerative disorders,such as Alzheimer's disease and Huntington's disease,and enhancement of postsynaptic density protein-95 association with TrkB signaling could mitigate the observed deficiency of neuronal connectivity in schizophrenia and *** with brain-derived neurotrophic factor is problematic,due to poor pharmacokinetics,low brain penetration,and side effects resulting from activation of the p75 neurotrophin receptor or the truncated TrkB.T1 *** TrkB agonists and antibodies that activate TrkB are being intensively investigated,they cannot distinguish the multiple human TrkB splicing isoforms or cell type-specific *** TrkB–postsynaptic density protein-95 coupling provides an alternative approach to specifically boost TrkB signaling at localized synaptic sites versus global stimulation that risks many adverse side effects.

关键词： Angelman syndrome autism brain-derived neurotrophic factor depression neurodegenerative disorder neurodevelopmental disorder postsynaptic density protein-95 synaptic plasticity TrkB

A review of neutral pH polymer electrolytes for electrochemical capacitors:Transitioning from liquid to solid devices

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Materials Reports(Energy) 2021年第1期1卷 26-44页

作者： alvin Virya keryn Lian Department of Materials Science&Engineering University of TorontoTorontoOntarioM5S 3E4Canada

The development of neutral pH polymer electrolytes has enabled high-performance solid-state,thin,and flexible electrochemical capacitors(ECs)to provide power for future consumer electronics and Internet-of-Thing *** their promising prospect,there is still some lack of understandings or disconnections from fundamental science to practical applications of these *** this review,we provide an overview of stateof-the-art studies on ECs with neutral pH electrolytes in both liquid and solid *** from the fundamental studies on the voltage window and ion conduction of salt species in liquid solution to polymer electrolytes,key considerations in developing neutral pH polymer electrolytes are *** performance of the polymer electrolytes along with their enabled solid symmetric and asymmetric EC devices,as well as some enhanced functionalities are *** future directions for research on neutral pH polymer electrolytes are proposed,expected to provide reference for further enriching the fundamental knowledge and improving the device performances.

关键词： Electrochemical capacitor Supercapacitor Electrolyte Neutral pH Aqueous-based electrolyte Polymer electrolyte Solid-state device Flexible device

Reinforcement learning models for scheduling in wireless networks

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Frontiers of Computer Science 2013年第5期7卷 754-766页

作者： kok-Lim alvin YAU kae Hsiang kWONG Chong SHEN Faculty of Science and Technology Sunway University Selangor 46150 Malaysia R&D Department Recovision Selangor 47650 Malaysia College of Information Science and Technology Hainan University Haikou 570228 China

The dynamicity of available resources and net- work conditions, such as channel capacity and traffic charac- teristics, have posed major challenges to scheduling in wire- less networks. Reinforcement learning （RL） enables wire- less nodes to observe their respective operating environment, learn, and make optimal or near-optimal scheduling deci- sions. Learning, which is the main intrinsic characteristic of RL, enables wireless nodes to adapt to most forms of dynamicity in the operating environment as time goes by. This paper presents an extensive review on the application of the traditional and enhanced RL approaches to various types of scheduling schemes, namely packet, sleep-wake and task schedulers, in wireless networks, as well as the advantages and performance enhancements brought about by RL. Addi- tionally, it presents how various challenges associated with scheduling schemes have been approached using RL. Finally, we discuss various open issues related to RL-based schedul- ing schemes in wireless networks in order to explore new re- search directions in this area. Discussions in this paper are presented in a tutorial manner in order to establish a founda- tion for further research in this field.

关键词： reinforcement learning scheduling wireless networks

Structure-Based Prediction of Transcription Factor Binding Sites

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Tsinghua Science and Technology 2014年第6期19卷 568-577页

作者： Jun-tao Guo Shane Lofgren alvin Farrel Department of Bioinformatics and Genomics University of North Carolina at Charlotte Charlotte NC 28223 USA

Transcription Factors（TFs） are a very diverse family of DNA-binding proteins that play essential roles in the regulation of gene expression through binding to specific DNA sequences. They are considered as one of the prime drug targets since mutations and aberrant TF-DNA interactions are implicated in many *** of TF-binding sites on a genomic scale represents a critical step in delineating transcription regulatory networks and remains a major goal in genomic annotations. Recent development of experimental high-throughput technologies has provided valuable information about TF-binding sites at genome scale under various physiological and developmental conditions. Computational approaches can provide a cost-effective alternative and complement the experimental methods by using the vast quantities of available sequence or structural information. In this review we focus on structure-based prediction of transcription factor binding sites. In addition to its potential in genomescale predictions, structure-based approaches can help us better understand the TF-DNA interaction mechanisms and the evolution of transcription factors and their target binding sites. The success of structure-based methods also bears a translational impact on targeted drug design in medicine and biotechnology.

关键词： transcription factor binding site structure-based predictions knowledge-based potential physics-based potential

Inundative field releases and evaluation of three predators for Bemisia tabaci （Hemiptera： Aleyrodidae） management in three vegetable crops

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Insect Science 2011年第2期18卷 195-202页

作者： alvin M. Simmons Shaaban Abd-Rabou USDA ARS U.S. Vegetable Laboratory Charleston South Carolina ARC PPRI Dokki Giza Egypt

The sweetpotato whitefly, Bemisia tabaci （Gennadius）（Hemiptera： Aleyrodidae）, is a global pest on numerous crops, including vegetables. Weekly inundative releases of a coccinellid predator （Coccinella undecimpunctata L. [Coleoptera： Coccinellidae]）, a common green lacewing predator （Chrysoperla carnea Stephen [Neuroptera： Chrysopidae]）, and a mirid predator （Macrolophus caliginosus [Wagner] [Hemiptera： Miridae]） were independently made in three vegetable crops （cabbage [Brassica oleracea var. capitata L.], cucumber [Cucumis sativus L.], and squash [Cucurbita pepo L.]） for the management of the sweetpotato whitefly. Approximately 1 million to 2.5 million larvae or nymphs of each predator were released in the vegetable crops during 20 weeks. Whitefly populations were reduced by ≈ 25%-45% during most of the season in each crop where each predator was released. The effect of each predator was similar on whitefly population reduction. Late in the season （October） when whitefly populations were low, generally no benefit was obtained from releasing the predators. Numbers of predators recovered during sampling in all crops were greatest for C. carnea, but this corresponded with the fact that more individuals of this predator were released than any other predator in the experiment. These results help define the utility of these natural enemies for managing B. tabaci in vegetable crops.

关键词： Bemisia tabaci Chrysoperla carnea Coccinella undecimpunctata Macrolophus caliginosus inundative release sweetpotato whitefly

An anisotropic propagation technique for synthesizing hyperbranched polyvillic gold nanoparticles

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Nano Research 2016年第10期9卷 2889-2903页

作者： Aaron S. Schwartz-Duval Santosh k. Misra Prabuddha Mukhejee Elyse Johnson alvin S. Acerbo Dipanjan Pan Department of Bioengineering and Beckman Institute University of Illinois Urbana-Champaign Urbana 61801 USA Biomedical Research Center Carle Foundation Hospital Urbana 61801 USA Cytoviva Inc. Auburn 36830 USA Center for Advanced Radiation Sources The University of Chicago Chicago 60637 USA

Of late, many synthesis processes have been studied to develop irregular nano-rnorphologies of gold nanostructures for biomedical applications in order to increase the efficacy of nanoparticle theranostics, tune the plasmonic absorbance spectra, and increase the sensitivity of biomolecule detection through surface enhanced Raman spectroscopy. Here we report, a novel, non-seed mediated versatile single pot synthesis method capable of producing hyperbranched gold ＂nano-polyvilli＂ with more than 50-90 branching nanowires propagating from a single origin within each structure. The technique was capable of achieving precise tuning of the branch propagation where the branching could be controlled by varying the duration of incubation, temperature, and hydrogen ion concentration.

关键词： gold nanoparticles surface enhanced Raman spectroscopy (SERS) anisotropy asymmetric nanocrystallization

Long-term outcomes of endothelial keratoplasty in Chinese eyes at a University Hospital

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Eye and Vision 2014年第1期1卷 51-54页

作者： alvin L Young Rachel PW kwok Vishal Jhanji Lulu L Cheng Srinivas k Rao Department of Ophthalmology and Visual Sciences The Chinese University of Hong KongPrince of Wales HospitalShatinHong KongChina Darshan Eye Clinic ChennaiIndia.

Background:Endothelial keratoplasty(Ek)is used increasingly for the management of cases with endothelial ***-term outcomes of the surgery are not widely reported in the *** report our experience of Ek in Chinese eyes at a University teaching ***:Retrospective analysis was performed for all cases of Ek performed between 2005 and *** analyzed included indication for surgery,associated surgical procedures,complications,best-corrected visual acuity(BCVA)and overall graft ***:Overall,22 eyes of 21 patients underwent Ek(13 males,8 females,mean age 71.8±11.3 years).Pseudophakic bullous keratopathy was the leading indication for surgery(n=12)followed by Fuchs’endothelial dystrophy(n=4),or both(n=3).Other indications for surgery included failed penetrating keratoplasty(n=2)and endothelial decompensation due to multiple surgeries(n=1).Triple procedure was performed in 5(22.7%)*** were noted in the form of postoperative interface hemorrhage(n=2,9%)and graft dislocation(n=1,4.5%).The mean postoperative endothelial cell density was 1069±585.8 cells/*** mean postoperative pachymetry was 675.8±108.5μ*** mean preoperative and postoperative intraocular pressure was 11.3±3.2 and 13.9±4.5 mmHg *** the last follow-up(mean,47.4±13.7 months),BCVA was≥20/70 in 9(40.9%)*** of poor BCVA included primary graft failure(n=4),graft decompensation(n=4),advanced glaucoma(n=2)and irreversible graft rejection(n=2).Graft remained clear in 12(54.5%)cases at the last *** graft survival was 19.7±17.7 months(median 17.5 months).Conclusions:Nearly half of the Ek grafts in our study survived over a period of five *** failure,glaucoma and graft rejection were the main causes of poor graft survival.

关键词： Endothelial keratoplasty keratoplasty Long-term outcomes