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Solid-State Metal Additive Manufacturing for Structural Repair

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Accounts of Materials Research 2021年第9期2卷 780-792页

作者： Ryan B.Gottwald R.joey Griffiths Dylan T.Petersen Mackenzie E.J.Perry Hang Z.yu Department of Materials Science and Engineering Virginia TechBlacksburgVirginia 24061United States

CONSPECTUS:Structural metal components play a vital role in a broad range of industries,from aerospace and automotive to infrastructure and *** service,these components can experience substantial wear,thermal fatigue,erosion,corrosion,or chemical reactions,resulting in significant surface or even volumetric *** of these components is often energy-intensive and economically *** repair,which aims to restore the original geometry while enabling good mechanical performance postrepair,can offset the costs *** on the additive capabilities and bonding mechanisms,structural repair technologies can be divided into four categories:nonadditive,nonmelting-based;nonadditive,melting-based;additive,nonmelting-based;additive,*** melting-based approaches can be applied to various repair geometries with good precision,the underlying melting and solidification processes inevitably lead to crucial problems impacting the mechanical performance,such as solidification porosity,high residual stresses,dendritic microstructure formation,elemental segregation,hot cracking,and stress corrosion *** fundamentally solve or minimize these problems,one may employ solid-state technologies that leverage ultrasonic vibration,friction stirring,or particle impact to facilitate metallurgical bond *** robust geometry restoration,an additive capability needs to be incorporated for continuous material feeding and precise deposition path ***,two solid-state technologies satisfy the requirement,cold spray and additive friction stir *** this Account,we discuss the structural repair enabled by solid-state metal additive manufacturing,focusing on(i)cold spray,which is a relatively established process,and(ii)additive friction stir deposition,which is an emerging process recently triggering significant research effortsthe authors are particularly invested in this process and are pioneering th

关键词： friction solidification corrosion

A cluster-randomized trial comparing two SwITCH implementation support strategies for school wellness intervention effectiveness

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Journal of Sport and Health Science 2023年第1期12卷 87-96页

作者： Richard R.Rosenkranz Philip M.Dixon David A.Dzewaltowski Gabriella M.McLoughlin joey A.Lee Senlin Chen Spyridoula Vazou Lorraine M.Lanningham-Foster Doug A.Gentile Gregory J.welk Department of Food NutritionDietetics&HealthKansas State UniversityManhattanKS 66506USA Department of Statistics Snedecor HallIowa State UniversityAmesIA 50011-1210USA Department of Health Promotion University of NebraskaOmahaNE 68198-4365USA Implementation Science Center for Cancer Control and Prevention Research Center Brown SchoolWashington University in St.LouisSt.LouisMO 63130USA Division of Public Health Sciences(Department of Surgery) Washington University School of MedicineWashington University in St.LouisSt.LouisMO 63130USA Department of Health Sciences University of Colorado Colorado SpringsColorado SpringsCO 80918USA Department of Kinesiology Iowa State UniversityAmesIA 50011-4008USA Department of Food Science&Human Nutrition Iowa State UniversityAmesIA 50011USA Department of Psychology Iowa State UniversityAmesIA 50011-1041USA

Background:The School wellness Integration Targeting Child Health(SwITCH)intervention has demonstrated feasibility as an implementation approach to help schools facilitate changes in students’physical activity(PA),sedentary screen time(SST),and dietary intake(DI).This study evaluated the comparative effectiveness of enhanced(individualized)implementation and standard(group-based)***:Twenty-two Iowa elementary schools participated,with each receiving standardized training(wellness conference and webinars).Schools were matched within region and randomized to receive either individualized or group implementation *** PA,SST,and DI outcomes of 1097 students were assessed at pre-and post-intervention periods using the youth Activity *** mixed models evaluated differential change in outcomes by condition,for comparative effectiveness,and by ***:Both implementation conditions led to significant improvements in PA and SST over time(py(p value range:0.02‒0.05).There were no differential changes between the group and individualized conditions for PA(p=0.51),SST(p=0.19),or DI(p=0.73).There were no differential effects by gender(i.e.,non-significant condition-by-gender interactions)for PA(p_(for interaction)=0.86),SST(p_(for interaction)=0.46),or DI(p_(for interaction)=0.15).Effect sizes for both conditions equated to approximately 6 min more PA per day and approximately 3 min less sedentary ***:The observed lack of difference in outcomes suggests that group implementation of SwITCH is equally effective as individualized implementation for building capacity in school wellness ***,the lack of interaction by gender suggests that SwITCH can be beneficial for both boys and *** research is needed to understand the school-level factors that influence implementation(and outcomes)of SwITCH.

关键词： Children Implementation science Obesity prevention Physical activity School health

Utilization of Pyrosequencing to Monitor the Microbiome Dynamics of Probiotic Treated Poultry (<i>Gallus gallus domesticus</i>) during Downstream Poultry Processing

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Agricultural Sciences 2017年第7期8卷 675-691页

作者： Vamsy Priya Guttala Enrique G. Medrano joey Bray Beatrice Clack Stephen F. Austin State University Department of Biology Nacogdoches USA United States Department of Agriculture Agricultural Research Service College Station USA

Antibiotic growth promoters that have been historically employed to control pathogens and increase the rate of animal development for human consumption are currently banned in many countries. Probiotics have been proposed as an alternative to control pathogenic bacteria. Traditional culture methods typically used to monitor probiotic effects on pathogens possess significant limitations such as a lack in sensitivity to detect fastidious and non-culturable bacteria, and are both time consuming and costly. Here, we tested next generation pyrosequencing technology as a streamline and economical method to monitor the effects of a probiotic on microbial communities in juvenile poultry (Gallus gallus domesticus) after exposure to several microbiological challenges and litter conditions. Seven days and repeated again at 39 days following hatching, chicks were challenged with either Salmonella enterica serovar Enteritidis, Campylobacter jejuni, or no bacteria in the presence of, or without a probiotic (i.e., Bacillus subtilis) added to the feed. Three days following each of two challenges (i.e., days 10 and 42, respectively) the microbiome distributions of the poultry caecum were characterized based on 16S rDNA analysis. Generated PCR products were analyzed by automated identification of the samples after pooling, multiplexing and sequencing. A bioinformatics pipeline was then employed to identify microbial distributions at the phylum and genus level for the treatments. In conclusion, our results demonstrated that pyrosequencing technology is a rapid, efficient and cost-effective method to monitor the effects of probiotics on the microbiome of poultry propagated in an agricultural setting.

关键词： Poultry Production Probiotics Pyrosequencing Mutiplex Identifier (MID) Microbiota

Functional imaging of neuron-astrocyte interactions in a compartmentalized microfluidic device

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Microsystems & Nanoengineering 2016年第1期2卷 284-292页

作者： yandong Gao joey Broussard Amranul Haque Alexander Revzin Tian Lin Department of Biomedical Engineering University of CaliforniaDavisCA 95616USA Department of Biochemistry and Molecular Medicine University of CaliforniaDavisCA 95616USA

Traditional approaches in cultivating neural cells in a dish without orienting their interactions have had only limited success in revealing neural network *** enhance the experimental capabilities of studying neural circuitry in vitro,we designed an experimental system combining concepts of micropatterned surfaces,microfluidic devices and genetically encoded *** was used to position neurons and astrocytes in defined locations and guide interactions between the two cell *** chambers were placed atop micropatterned surfaces to allow delivery of different pharmacological agents or viral vectors to the desired cell *** this device,astrocytes and neurons communicated through grooves molded into the floor of the microfluidic *** combining microfluidics with genetically encoded calcium indicators as functional readouts,we further demonstrated the utility of this device for analyzing neuron–neuron and neuron–astrocyte interactions in vitro under both healthy and pathophysiological *** found that both spontaneous and evoked calcium dynamics in astrocytes can be modulated by interactions with *** the future,we foresee employing the microdevices described here for studying mechanisms of neurological disorders.

关键词： microfluidics surface micropatterning neurons astrocytes neuron-astrocyte interactions biosensors

Seasonally frozen soil effects on the dynamic behavior of highway bridges

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Research in Cold and Arid Regions 2012年第1期4卷 13-20页

作者： ZhaoHui ＂joey＂ yang Qiang Li Elmer E. Marx JinChi Lu Department of Civil Engineering University of Alaska-Anchorage Anchorage Alaska USA Bridge Design Engineer State of Alaska DOT＆PF 3132 Channel Drive Juneau AK 99801 USA Assistant Project Scientist Department of Structural Engineering University of California San Diego La Jolla CA 92093 USA

Frozen ground is significantly stiffer than unfrozen ground. For bridges supported on deep foundations, bridge stiffness is also measurably higher in winter months. Significant changes due to seasonal freezing in bridge pier boundary conditions require addi- tional detailing in order to ensure a ductile performance of the bridge during a design earthquake event. This paper reports the lat- est results obtained from a project that systematically investigated the effects of seasonally frozen soil on the seismic behavior of highway bridges in cold regions. A bridge was chosen and was monitored to study its seismic performance and assess the impact of seasonally frozen soil on its dynamic properties. A Finite Element （FE） model was created for this bridge to analyze the impact of seasonal frost. It was found that when frost depth reaches 1.2 m, the first transverse modal frequency increases about 200% when compared with the no-frost case. The results show that seasonal frost has a significant impact on the overall dynamic be- havior of bridges supported by pile foundations in cold regions, and that these effects should be accounted for in seismic design.

关键词： dynamic behavior , seasonally frozen soil pile foundation earthquake Finite Element modeling

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罗伯斯:欲与刘翔试比快

体育健康知识画刊 2008年第7期 56-59页

作者： joey

说起古巴,你的印象是什么?是郁郁葱葱的甘蔗林和那白花花的蔗糖,是太子港迷人的加勒比风情,抑或是传奇的切格瓦拉和他手中那根醉人的雪茄?如果你是一位体育迷的话,你还会想到古巴那支无往不胜的棒球队,如果你对体育并不感冒,对体育的了... 详细信息

说起古巴,你的印象是什么?是郁郁葱葱的甘蔗林和那白花花的蔗糖,是太子港迷人的加勒比风情,抑或是传奇的切格瓦拉和他手中那根醉人的雪茄?如果你是一位体育迷的话,你还会想到古巴那支无往不胜的棒球队,如果你对体育并不感冒,对体育的了解莫过姚明、刘翔或者即将来临的北京奥运会,那么你就要继续把这剩下的文字看完,因为一个人,他跑得比刘翔还要快,更重要的是,他还将在北京与刘翔一较高下。他就是来自古巴的跨栏高手——戴龙·罗伯斯。

关键词：罗伯斯刘翔特拉梅尔国际田联田径项目古巴人世界纪录纪录保持者孙海平主场优势

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玩具市场大报告

摄影之友 2018年第6期 74-75页

作者： joey

从全球玩具市场分布来看，近年来玩具消费从成熟的欧美地区逐渐延伸至亚洲、南美、澳洲等新兴市场。中国仅次于美国，稳居全球第二大玩具消费国。在出口方面，中国又是全球第一玩具出口国，玩具市场潜力巨大，预计2021年玩具销售额将达... 详细信息

从全球玩具市场分布来看，近年来玩具消费从成熟的欧美地区逐渐延伸至亚洲、南美、澳洲等新兴市场。中国仅次于美国，稳居全球第二大玩具消费国。在出口方面，中国又是全球第一玩具出口国，玩具市场潜力巨大，预计2021年玩具销售额将达920亿元。同时，玩具也不再成为小朋友的专属!越来越多的成年人也在日益创新成熟的玩具潮流中收获童真的乐趣。

关键词：玩具市场大报市场分布欧美地区玩具消费市场潜力消费国出口方