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Assessment of portable FTIR and Raman spectroscopy for the detection of 2,3-dimethyl-2,3-dinitrobutane(DMDNB)in plastic explosives

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Defence Technology（防务技术） 2024年第4期34卷 11-18页

作者： Jacky Cailes Robert Dunsmore kathryn L.Linge ChemCentre PO Box 1250PerthAustralia

The Marplex Convention was established to prevent the manufacture of unmarked plastic explosives and stipulates that a volatile detection agent must be added at the time of ***,to-date,laboratory testing remains the internationally accepted practice for identifying and quantifying the taggants stipulated in the *** this project,portable FTIR and Raman instruments were tested for their ability to detect 2,3-dimethyl-2,3-dinitrobutane(DMDNB),the chemical marker incorporated in plastic explosives that are manufactured within *** both FTIR and Raman instruments detected solid DMDNB(98%purity),field analysis of plastic explosives at an Australian Defence establishment showed that both FTIR and Raman spectra were matched the relevant explosive(RDX or PETN),rather than the DMDNB *** all three plastic explosives tested,the concentration of DMDNB was measured by SPME-gC-MS to be between 1.8 and 2%,greater than the minimum 1%concentration stipulated by the Marplex *** testing with a plastic explosive analogue confirmed that the minor absorption peaks that would characterize low concentrations of DMDNB were masked by absorption bands from other compounds within the ***,while both FTIR and Raman spectroscopy are suitable for detection of plastic explosives,neither rely on the presence of DMDNB for *** is likely that similar results would be found for other taggants stipulated by the Marplex Convention,given they are also present in concentrations less than 1%.

关键词： Explosive ICAO taggants 2,3-Dimethyl-2,3-dinitrobutane(DMDNB) Fourier transform infrared(FTIR) Raman

An effective strategy to inhibit grain coarsening:Construction of multi-element co-segregated grain boundary complexion

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Journal of Advanced Ceramics 2024年第7期13卷 1060-1071页

作者： Le Fu gabriel Arcuri Wenjun Yu Bohan Wang Zihua Lei Ying Deng kathryn grandfield School of Material Science and Engineering Central South UniversityChangsha 410083China Canadian Centre for Electron Microscopy McMaster UniversityHamilton L8S 4L8Canada State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Department of Materials Science and Engineering McMaster UniversityHamilton L8S 4L8Canada

When exposed to moderate to high temperatures,nanomaterials typically suffer from severe grain coarsening,which has long been a major concern that prevents their wider ***,we proposed an effective strategy to inhibit grain coarsening by constructing grain boundary(gB)complexions with multiple codoped dopants,which hindered coarsening from both energetic and kinetic *** demonstrate the feasibility of this strategy,multiple selected dopants were doped into a ZrO_(2)-SiO_(2)nanocrystalline glass ceramic(NCgC)to form gB *** results showed that NCgC was predominantly composed of ZrO_(2)nanocrystallites(NCs)distributed in an amorphous SiO_(2)*** layers of gB complexions(~2.5 nm)were formed between adjacent ZrO_(2)NCs,and they were crystalline superstructures with co-segregated *** addition,a small amount of quartz solid solution was formed,and it adhered to the periphery of ZrO_(2)NCs and bridged the adjacent NCs,acting as a“bridging phase”.The gB complexions and the“bridging phase”synergistically enhanced the coarsening resistance of ZrO_(2)NCs up to 1000°*** findings are important for understanding gB complexions and are expected to provide new insights into the design of nanomaterials with excellent thermodynamic stability.

关键词： Zr_(2)-Si_(2) multi-element co-segregation grain boundary(gB)complexion grain coarsening atom probe tomography(APT)

In vivo measurement of NADH fluorescence lifetime in skeletal muscle via -ber-coupled time-correlated single photon counting

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Journal of Innovative Optical Health Sciences 2024年第1期17卷 121-134页

作者： kathryn M.Priest Jacob V.Schluns Nathania Nischal Colton L.gattis Jeffrey C.Wolchok Timothy J.Muldoon Department of Biomedical Engineering University of Arkansas FayettevilleARUSA

Nicotinamide adenine dinucleotide(NADH)is a cofactor that serves to shuttle electrons during metabolic processes such as glycolysis,the tricarboxylic acid cycle,and oxidative phosphorylation(OXPHOS).NADH is autofluorescent,and itsfluorescence lifetime can be used to infer metabolic dynamics in living ***-coupled time-correlated single photon counting(TCSPC)equipped with an implantable needle probe can be used to measure NADH lifetime in vivo,enabling investigation of changing metabolic demand during muscle contraction or tissue *** study illustrates a proof of concept for point-based,minimally-invasive NADHfluorescence lifetime measurement in *** muscle loss(VML)injuries were created in the left tibialis anterior(TA)muscle of male Sprague Dawley *** lifetime measurements were collected before,during,and after a 30 s tetanic contraction in the injured and uninjured TA muscles,which was subsequently-t to a biexponential decay model to yield a metric of NADH utilization(cytoplasmic vs protein-bound NADH,the A11/A22 ratio).On average,this ratio was higher during and after contraction in uninjured muscle compared to muscle at rest,suggesting higher levels of free NADH in contracting and recovering muscle,indicating increased rates of *** injured muscle,this ratio was higher than uninjured muscle overall but decreased over time,which is consistent with current knowledge of inflammatory response to injury,suggesting tissue regeneration has *** data suggest that-ber-coupled TCSPC has the potential to measure changes in NADH binding in vivo in a minimally invasive manner that requires further investigation.

关键词： glycolysis oxidative phosphorylation energy metabolism volumetric muscle loss

Stand dynamics of old-growth hemlock forests in central Bhutan are shaped by natural disturbances

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Forest Ecosystems 2024年第4期11卷 434-447页

作者： Karma Tenzin Craig R.Nitschke kathryn J.Allen Raphael Trouve Thiet V.Nguyen Patrick J.Baker School of Agriculture Foodand Ecosystem SciencesUniversity of Melbourne500 Yarra BlvdRichmondVictoriaAustralia School of geography Planningand Spatial SciencesUniversity of TasmaniaSandy BayTasmaniaAustralia Forest Science Institute of South Vietnam 1 Pham Van Hai StreetTan Binh DistrictHo Chi Minh CityViet Nam

Understanding how past disturbances have influenced the development of forests is critical for deciphering their current structure and composition and forecasting future *** this study,dendrochronological methods were applied to uncover the disturbance history of old-growth hemlock-dominated forests in central *** of tree-ring samples from two old-growth hemlock stands,located in two different topographic settings,identified the importance of gap-phase dynamics in facilitating recruitment and growth releases and producing complex,multi-aged structure s over *** site showed evidence of a near stand-replacing disturbance in the late 1700s,while the other showed no evide nce of high-severity disturbance at any time over the last 400 *** both sites low-to medium-severity disturbances,some of which appear to be associated with cyclones originating in the Bay of Bengal,dominated the disturbance *** hemlock stands exhibited a significant positive association between cyclone occurrence and growth release events and between recruitment pulses and growth release *** 1800 to 1970 there was an increase in recruitment of angiosperm tree species at most sites and a corresponding decline in conifer *** the past 50 years there has been little new recruitment;this may be due to light limitation in the understory from shade-tolerant angiosperms and bamboo in the lower strata of these *** variations in disturbance dynamics and recruitment were observed across the study sites,suggesting that other factors,such as topography and climate,may be influencing long-term stand development *** study highlights the complex interplay between historical disturbance regimes and tree recruitment in shaping the age and size structures of old-growth hemlock forests in central *** also provides new insights into the dynamics of these forests that can be used to support effective forest conservation and management i

关键词： Forest structure Hemlock forest Himalaya Natural disturbance

Reproductive ecology of the black rat (Rattus rattus) in Madagascar: the influence of density-dependent and -independent effects

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Integrative Zoology 2024年第1期19卷 66-86页

作者： kathryn SCOBIE Soanandrasana RAHELINIRINA Voahangy SOARIMALALA Fehivola Mandanirina ANDRIAMIARIMANANA Corinne RAHAINgOSOAMAMITIANA Toky RANDRIAMORIA Soloandry RAHAJANDRAIBE Xavier LAMBIN Minoarisoa RAJERISON Sandra TELFER School of Biological Sciences University of AberdeenAberdeenUK Plague Unit Institut Pasteur de MadagascarAntananarivoMadagascar Association Vahatra AntananarivoMadagascar

The black rat(Rattus rattus)poses a severe threat to food security and public health in Madagascar,where it is a major cause of pre-and post-harvest crop losses and an important reservoir for many zoonotic diseases,including ***,ecologically based rodent management(EBRM)strategies have been developed using ecologi-cal information to inform decisions on where and when to target *** could deliver improved health and well-being outcomes in Madagascar if adapted to the local ecological *** data collected from removal studies,we explored spatio-temporal patterns in the breeding activity of the black rat(***)in domestic and agricultural habitats across Madagascar and investigated to what extent these trends are influenced by rainfall and rat *** identified clear spatio-temporal variation in the seasonality of *** *** was highly seasonal both inside and outside of houses,but seasonal trends varied between these two ***-sonal trends were explained,in part,by variation in rainfall;however,the effect of rainfall on reproductive rates did itself vary by season and habitat type.A decline in breeding intensity with increasing rat density was recorded outside of *** has important implications for control,as populations may compensate for removal through increased *** recommend that sustained control initiated before the main breeding season,combined with improved hygiene and adequate rodent-proofing in homes and grain stores,could curtail population growth and reduce pre-and post-harvest losses provided that these measures overcome the compensatory response of rodent populations.

关键词： Madagascar Rattus rattus reproductive ecology rodent control

How completely are randomized controlled trials of non-pharmacological interventions following concussion reported? A systematic review

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Journal of Sport and Health Science 2024年第4期13卷 537-547页

作者： Jacqueline Josee van Ierssel Olivia galea Kirsten Holte Caroline Luszawski Elizabeth Jenkins Jennifer O’Neil Carolyn A Emery Rebekah Mannix kathryn Schneider Keith Owen Yeates Roger Zemek Children’s Hospital of Eastern Ontario Research Institute OttawaON K1H 8L1Canada The Centre for Health Activity and Rehabilitation ResearchUniversity of OtagoDunedin 9016New Zealand Sport Injury Prevention Research Centre Faculty of KinesiologyUniversity of CalgaryCalgaryAB T2N 1N4Canada Alberta Children’s Hospital Research Institute University of Calgary CalgaryAB T2N 1N4Canada Hotchkiss Brain Institute University of CalgaryCalgaryAB T2N 4N1Canada Department of Psychology University of CalgaryCalgaryAB T2N 1N4Canada g Faculty of MedicineUniversity of OttawaOttawaON K1H 8M5Canada School of Rehabilitation Sciences University of OttawaOttawaON K1H 8M5Canada Bruyere Research Institute OttawaON K1N 5C8Canada Departments of Pediatrics and Emergency Medicine Harvard Medical SchoolBostonMA 02115USA Departments of Pediatrics and Emergency Medicine University of OttawaOttawaON K1H 8M5Canada

Purpose:The study aimed to examine the reporting completeness of randomized controlled trials(RCTs)of non-pharmacological interventions following ***:We searched MEDLINE,Embase,PsycInfo,CINAHL,and Web of Science up to May *** reviewers independently screened studies and assessed reporting completeness using the Template for Intervention Description and Replication(TIDieR),Consensus on Exercise Reporting Template(CERT),and international Consensus on Therapeutic Exercise aNd Training(i-CONTENT)*** information was sought my study authors where reporting was *** of bias(ROB)was assessed with the Cochrane ROB-2 *** examining non-pharmacological interventions following ***:We included 89 RCTs(n=53 high ROB)examining 11 different interventions for concussion:sub-symptom threshold aerobic exercise,cervicovestibular therapy,physical/cognitive rest,vision therapy,education,psychotherapy,hyperbaric oxygen therapy,transcranial magnetic stimulation,blue light therapy,osteopathic manipulation,and head/neck *** scores were:TIDieR 9/12(75%;interquartile range(IQR)=5;range:5-12),CERT 17/19(89%;IQR=2;range:10-19),and i-CONTENT 6/7(86%;IQR=1;range:5-7).Percentage of studies completely reporting all items was TIDieR 35%(31/89),CERT 24%(5/21),and i-CONTENT 10%(2/21).Studies were more completely reported after publication of TIDieR(t_(87)=2.08;p=0.04)and CERT(t_(19)=2.72;p=0.01).Reporting completeness was not strongly associated with journal impact factor(TIDieR:rs=0.27;p=0.01;CERT:r_(s)=-0.44;p=0.06;i-CONTENT:r_(s)=-0.17;p=0.48)or ROB(TIDieR:rs=0.11;p=0.31;CERT:rs=0.04;p=0.86;i-CONTENT:rs=0.12;p=0.60).Conclusion:RCTs of non-pharmacological interventions following concussion demonstrate moderate to good reporting completeness,but are often missing key components,particularly modifications,motivational strategies,and qualified *** completeness improved after TIDieR and CERT publication,but p

关键词： Concussion Intervention Randomized controlled trial Systematic review

Estradiol increases cortical and trabecular bone accrual and bone strength in an adolescent male-to-female mouse model of gender-affirming hormone therapy

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Bone Research 2024年第1期12卷 95-106页

作者： Tian Nie Varun S.Venkatesh Suzanne golub kathryn S.Stok Haniyeh Hemmatian Reena Desai David J.Handelsman Jeffrey D.Zajac Mathis grossmann Rachel A.Davey Department of Medicine Austin HealthUniversity of MelbourneHeidelbergVIC 3084Australia Department of Biomedical Engineering University of MelbourneParkvilleVIC 3010Australia ANZAC Research Institute University of Sydney and AndrologyConcord Repatriation General HospitalConcordNSW 2137Australia

The effects of gender-affirming hormone therapy on the skeletal integrity and fracture risk in transitioning adolescent trans girls are *** address this knowledge gap,we developed a mouse model to simulate male-to-female transition in human adolescents in whom puberty is first arrested by using gonadotrophin-releasing hormone analogs with subsequent estradiol *** was suppressed by orchidectomy in male mice at 5 weeks of *** 3 weeks post-surgery,male-to-female mice were treated with a high dose of estradiol(~0.85 mg)by intraperitoneal silastic implantation for 12 *** included intact and orchidectomized males at 3 weeks post-surgery,vehicle-treated intact males,intact females and orchidectomized males at 12 weeks *** to male controls,orchidectomized males exhibited decreased peak bone mass accrual and a decreased maximal force the bone could withstand prior to *** treatment in orchidectomized male-to-female mice compared to mice in all control groups was associated with an increased cortical thickness in the mid-diaphysis,while the periosteal circumference increased to a level that was intermediate between intact male and female controls,resulting in increased maximal force and *** trabecular bone,estradiol treatment increased newly formed trabeculae arising from the growth plate as well as mineralizing surface/bone surface and bone formation rate,consistent with the anabolic action of estradiol on osteoblast *** data support the concept that skeletal integrity can be preserved and that long-term fractures may be prevented in trans girls treated with gnRHa and a sufficiently high dose of *** study is needed to identify an optimal dose of estradiol that protects the bone without adverse side effects.

关键词： treatment treatment strength

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《近代中国》学刊五十年

开放时代 2024年第3期 69-78,M0004,M0005页

作者：黄宗智白凯中国人民大学法学院历史与社会高等研究所美国加利福尼亚大学洛杉矶校区历史系(荣休)

回顾《近代中国》创刊以来的50年,我们可以看到,肇始,在《近代中国》所有作者中,非华裔美国学者占比最大,为73%,到20世纪末,占比仍然高达64%,但之后则直线下降,2005—2009年为26%,2020—2022年为11%。在一定程度上,这样的趋势被在美国... 详细信息

回顾《近代中国》创刊以来的50年,我们可以看到,肇始,在《近代中国》所有作者中,非华裔美国学者占比最大,为73%,到20世纪末,占比仍然高达64%,但之后则直线下降,2005—2009年为26%,2020—2022年为11%。在一定程度上,这样的趋势被在美国华裔学者(无论美国公民与否)的扩增部分抵消。近20年中国内地学者在学刊上的发文占比越来越大,如今达到28%。如果再加上美国和全球其他地区华裔学者的话,占比更高达65%,无疑乃是重大的演变。同时,在美国以外的其他地区(诸如英国、加拿大、澳大利亚、德国、荷兰等)的非华裔中国研究专家有一定比例的扩增,但总体来说,英语中国研究近乎是以华人为主的天下,也是一个高度跨国化的专业。在回顾与总结之外,本文将附带一些给青年投稿者的建议。

关键词：非华裔美国学者华裔美国学者中国内地学者美国以外的华裔学者学刊的主要议题

Dynamic Frontier-Led Swarming:Multi-Robot Repeated Coverage in Dynamic Environments

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IEEE/CAA Journal of Automatica Sinica 2023年第3期10卷 646-661页

作者： Vu Phi Tran Matthew A.garratt kathryn Kasmarik Sreenatha g.Anavatti School of Engineering and Information Technology University of New South WalesCanberraAustralian Capital Territory 2612Australia IEEE

A common assumption of coverage path planning research is a static *** environments require only a single visit to each area to achieve ***,some real-world environments are characterised by the presence of unexpected,dynamic *** require areas to be revisited periodically to maintain an accurate coverage map,as well as reactive obstacle *** paper proposes a novel swarmbased control algorithm for multi-robot exploration and repeated coverage in environments with unknown,dynamic *** algorithm combines two elements:frontier-led swarming for driving exploration by a group of robots,and pheromone-based stigmergy for controlling repeated coverage while avoiding *** tested the performance of our approach on heterogeneous and homogeneous groups of mobile robots in different *** measure both repeated coverage performance and obstacle avoidance *** a series of comparison experiments,we demonstrate that our proposed strategy has superior performance to recently presented multi-robot repeated coverage methodologies.

关键词： Artificial pheromones distributed control architecture dynamic obstacle avoidance multi-robot coverage stigmergy swarm robotics