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High Strain-rate and Shock response of Carbon SupercompositeTm

Open Journal of Composite materials 2024年第3期14卷 132-145页

作者： Suman Babu Ukyam raju P. mantena Damian L. Stoddard Arunachalam m. rajendran Department of mechanical Engineering University of Mississippi Mississippi USA

This study focuses on assessing the dynamic behaviors of carbon SupercompositeTm laminates when subjected to high strain-rates and air blast loads, using a shock tube for testing. The investigation aims to understand the response of these advanced materials under extreme conditions, which is crucial for applications in aerospace, military, and other high-performance industries. SupercompositeTm (CZE) prepreg, made up of a 3K plain weave carbon fabric with milled carbon fibers as interlaminar reinforcements impregnated with epoxy, is used to create SupercompositeTm (CZE) laminates. A woven carbon composite (CBE) laminate was also created using 3K plain weave Carbon/Epoxy (CBE) prepreg. Both types of laminates were designed and fabricated using the autoclave process. The dynamic behaviors of CZE and CBE laminate under transverse compression loads were evaluated using a modified Split Hopkinson Pressure bar (SHPB). The study found that the 3D reinforcement with milled carbon fibers significantly affected the dynamic behavior of the CZE laminate. Stereo imaging videos, captured using two SHImADZU high-speed video cameras in shock tube experiments, recorded the time history of back surface deflection. The plate specimens exhibited low deflections without any visible damage. The experimentally observed center point deflections of the CZE plates decayed sooner than those of the CBE laminates, indicating an improvement in damping due to the presence of 3D reinforced milled carbon fibers. This research shows that optimized utilization of milled carbon fibers as 3D reinforcement can withstand high stress in the thickness direction and higher energy absorption when subjected to impact and high strain-rate loading.

关键词： SupercompositeTm GOm Software 3D reinforcement milled Carbon Fibers Split Hopkinson Pressure bar (SHPB) Air-Blast Loads

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一种高频震级标度

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世界地震译丛 1996年第3期27卷 54-62页

作者： G.m.Atkinson T.C.Hanks 杨宝仁国家地震局地球物理研究所

提出一种高频震级标度(m): m=2log■_(kf)+3式中,■_(kf)是在震源或距断层10km处加速度傅里叶振幅谱的高频水平,单位是cm/s(平均的或其中任意一个水平分量)。可以从仪器资料或地震的有感面积来测定m。在北美东部和加州,我们规定对应于... 详细信息

提出一种高频震级标度(m): m=2log■_(kf)+3式中,■_(kf)是在震源或距断层10km处加速度傅里叶振幅谱的高频水平,单位是cm/s(平均的或其中任意一个水平分量)。可以从仪器资料或地震的有感面积来测定m。在北美东部和加州,我们规定对应于“平均”应力降的地震,m=m(矩震级)。如果m也是已知的,则m提供应力降的测量。观测的m与m之间的关系表明,对于北美东部地区地震,平均应力降大约是150bar;对于加州地区地震,平均应力降大约是70bar。北美东部地区应力降的变化又比加州地区的大得多。所提出标度的主要理由是它可用来解释有仪器记录的以前的大地震,而这些地震对北美东部地震危险性估计是十分重要的。对于这样的地震,m可以比m或m_N(Nuttli震级)的测定更为可靠,并且形成测定高频地面运动的更好基础。当将m和m作为一对使用时,则可提供为覆盖整个工程频带的地面运动的一个好的指标。如果能够给出一个地震的两种震级,那么,就可以用一个地面运动模型,如随机模型,获得可靠的反应谱和地面运动峰值。

关键词：地震震源震级标度

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Dual resistance of melon to Fusarium oxysporum races 0 and 2 and to Papaya ring-spot virus is Controlled by a Pair of Head-to-Head-Oriented NB-Lrr Genes of Unusual Architecture

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molecular Plant 2013年第1期6卷 235-238页

作者： Yariv Brotman michael Normantovich Zachi Goldenberg Zvi Zvirin Irina Kovalski Nastacia Stovbun Tirza Doniger Anthony m. Bolqer Christelle Troadec Abdelhafid Bendahman~ roniCohen Nurit Katzir michel Pitrat Catherine Dogimont rafael PerI-Treves mina and Everard Goodman Faculty of Life Sciences Bar-Ilan University Ramat-Gan 52900 Israel max Planck institute of molecular Plant Physiology 14476 Potsdam-Golm Germany Unite de recherche en Genomique Veagetale INRA-UEVE-CNRS Evry France Department of Vegetable research Agricultural Research Organization Newe Ya'ar Research Center PO Box 1021 Ramat Yishay 30095 Israel Unite de Genetique et Amelioration des Fruits et Legumes INRA UR1052 84143 Montfavet cedex France

Dear Editor, Potyviruses such as Papaya ring-spot virus （PrSV） cause important yield losses in cucurbits. Two distinct resistant alleles were identified in the Cucumis melo germplasm. Accession PI 414723 （Supplemental Table 1） possesses mono- genic resistance, controlled by the Prv2 allele, and reacts to PrSV by systemic necrotic lesions; plants with the PryI allele, described in cultivar wmr-29, remain symptomless （Pitrat and Lecoq, 1983）. Fusarium oxysporum f. sp. melonis （FUS） exclusively attacks melon, causing severe wilt. monogenic dominant resistance was described against races O, 1, and 2. The Fore-2 gene, controlling resistance to races 0 and 1, was cloned by Joobeur et al. （2004）, and encodes a nucleotide bindina domain （NB）-Ieucine rich repeat （Lrr） protein.

关键词： melons Chpher(0) Genes Pairing Potyvirus papayas yield loss racial Stocks Fusarium oxysporum

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产前暴露于倍他米松与地塞米松的低体重新生儿近期不良结局的比较

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世界核心医学期刊文摘（妇产科学分册） 2005年第9期1卷 44-44页

作者： bar-Lev m.r.r. maayan-metzger A. matok I. J. Kuint 王伟华 Department of Neonatology Sheba Medical Center 52621 Ramat Gan Israel Dr.

OBJECTIVE: To assess the incidence of short-term outcomes of low birth weig ht infants (≤1,750 g) exposed prenattally to either dexamethasone or betamethaso ne. mETHODS: we retrospectively analyzed a cohort comprising 550 infants who wer e born alive at our center during the period January 1999 through December 2001, who weighed 1,750 g or less at birth, and who were exposed to prenatal steroid treatment. we compared brain ultrasound findings, such as intraventricular hemor rhage and cystic periventricular leukomalacia (PVL), as well as other clinical f indings, including respiratory distress syndrome (rDS), necrotizing enterocoliti s, retinopathy of prematurity, and bronchopulmonary dysplasia, for all premature infants whose mothers received either dexamethasone (from January 1, 1999 to Ju ne 30, 2000, n = 263) or beta-methasone (July 1, 2000 to December 31, 2001, n = 287). rESULTS: Patient characteristics (mothers and infants) were the same in b oth groups, with the exception of the number of steroid courses administered, th e number of women with premature rupture of membranes (defined as >24 hours), an d the number of women who had received tocolysis. No significant difference was found between the 2 groups with respect to intraventricular hemorrhage and cysti c PVL frequencies. No significant differences were found in the incidence of sho rt-term outcomes examined, despite the fact that the dexamethasone group was ex posed to a statistically significantly greater number of courses than the betame thasone group. CONCLUSION: There seem to be no advantages to maternal antenatal treatment with betamethasone compared with dexamethasone in reducing the risk of PVL in low birth weight (≤1,750 g) infants. Both drugs have the same effect on all short-term outcome parameters checked.

关键词：倍他米松呼吸窘迫综合征类固醇治疗视网膜病变胎膜早破无显著性差异保胎治疗超声结果发育不良日至

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Synthesis of cyclic carbonates from epoxides or olefins and CO_2 catalyzed by metal-organic frameworks and quaternary ammonium salts

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Journal of Energy Chemistry 2013年第1期22卷 130-135页

作者： Olga V. Zalomaeva Nataliya V. maksimchuk Andrey m. Chibiryaev Konstantin A. Kovalenko Vladimir P. Fedin Bair S. Balzhinimaev Boreskov Institute of Catalysis pr. Akademika Lavrentieva 5 Vorozhtsov Novosibirsk Institute of Organic Chemistry pr Akademika Lavrentieva 9 Nikolaev Institute of Inorganic Chemistry pr. Akademika Lavrentieva 3

Catalytic properties of the metal-organic framework Cr-mIL-101 in solvent-free cycloaddition of CO2 to epoxides to produce cyclic carbon- ates using tetrabutylammonium bromide as co-catalyst have been explored under mild reaction conditions （8 bar CO2, 25 ~C）. Styrene and propylene carbonates were formed with high yields （95% and 82%, respectively）. Catalytic performance of Cr-mIL-101 was compared with other mOFs： Fe-mIL-101, Zn-mOF-5 and HKUST-1, The catalytic properties of different quaternary ammonium bromides, Cr-mIL-101 as well as Pw12/Cr-mIL-101 composite material have been assessed in oxidative carboxylation of styrene in the presence of both tert-butyl hydroperoxide and H202 as oxidants at 8-100bar CO2 and 25-80 ~C with selectivity to styrene carbonate up to 44% at 57% substrate conversion.

关键词： carbon dioxide cyclic carbonates cycloaddition heterogeneous catalysis metal-organic framework oxidative carboxylation quaternary am-monium salts

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mutations in a P-type ATPase gene cause axonal degeneration

Mutations in a P-type ATPase gene cause axonal degeneration

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2012全国发育生物学大会

作者： richard T.Libby wilhelmine N.de Vries richard S.Smith Dana L.wright roderick T.Bronson Kevin L.Seburn Simon w.m.John The Howard Hughes medical Institute The Jackson Laboratory600 Main StreetBar HarborMEUSA Department of Ophthalmology Tufts University of MedicineBostonMAUSA

Neuronal loss and axonal degeneration are important pathological features of many neurodegenerative diseases. The molecular mechanisms underlying the majority of axonal degeneration conditions remain *** better understand axonal degeneration,we studied a mouse mutant wabbler-Iethal(wl).wabbler-lethal(wl) mutant mice develop progressive ataxia with pronounced neurodegeneration in the central and peripheral nervous *** studies have led to a debate of whether myelinopathy or axonopathy is the primary cause of neurodegeneration observed in wl mice. Here we provide clear evidence that wabbler lethal mutants develop an axonopathy,and that this axonopathy is modulated by wld and Bax *** addition,we have identified the gene harboring the disease-causing mutations as *** studied three wl alleles and found that all result from mutations in the Atp8a2 *** analysis shows that ATP8A2 possesses phosphatidylserine translocase activity and is involved in localization of phosphatidylserine to the inner leaflet of the plasma ***8a2 is widely expressed in the brain,the spinal cord,and *** assessed two of the mutant alleles of Atp8a2 and found they are both nonfunctional for the phosphatidylserine translocase activity. Conclusions:Our data demonstrate for the first time that mutation of a mammalian phosphatidylserine translocase causes axon degeneration and neurodegenerative disease.

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Corrosion measurements of reinforcing Steel by Different Electrochemical Techniques

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Journal of materials Science & Technology 1995年第6期11卷 447-451页

作者： S.m.morsy (metallurgy Dept. Nuclear research Center, Atomic Energy Authority, Cairo, Egypt) I.Z.Selim (Physical Chemistry Dept., National research Center, Dokki, Cairo, Egypt)S. H. Tantawi (Building research Institute, Dokki, Cairo, Egypt) Atomic Energy Authority Cairo Egypt

Electrochemical techniques of the corrosion measurements of reinforcing steeI in concrete have been evaluated. These techniques include half-cell potential measurements, impressed voltage method, impressed current method and potentiostatic polarization technique. The results of corrosion behaviour of the steel in both 5%NaCl and 5%mgSO4 show that each electrochemical technique provides some information about the condition of the steel bar or the corrosivity of the environment being evaluated, yet none provides a complete data regarding the corrosion resistance of reinforcing steel in aggressive media

关键词： Corrosion measurements of reinforcing Steel by Different Electrochemical Techniques

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人工源超低频电磁波技术及在首都圈地区的测量研究

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地学前缘 2003年第U08期10卷 248-257页

作者：赵国泽汤吉邓前辉赵俊猛王继军陈小斌詹艳宣飞 A.K.SArAEV m.I.PErTEL A.B.KOTCHErOV m.m.KHArLmOV 鲁跃刘允秀张建新翟彦忠中国地震局地质研究所北京100029 St.Petersburg State University 北京市地震局北京100080 天津市地震局天津300201 河北省地震局河北石家庄050021

超低频 (SLF)电磁波技术利用地球物理和无线电物理相结合的原理 ,由人工产生大功率电磁波信号。在地面很大范围的许多测点同时测量该信号 ,可研究空间电磁场和地下电阻率结构 ,研究地震等引起的电磁场异常变化 ,探测地壳结构和地下资源... 详细信息

超低频 (SLF)电磁波技术利用地球物理和无线电物理相结合的原理 ,由人工产生大功率电磁波信号。在地面很大范围的许多测点同时测量该信号 ,可研究空间电磁场和地下电阻率结构 ,研究地震等引起的电磁场异常变化 ,探测地壳结构和地下资源。在首都圈地区的观测表明 ,SLF信号的功率谱密度超过天然场源信号数倍以上 ,所得到的视电阻率数据精度远高于天然源方法 ,并有长时间的稳定性。在测量期间距测点约 12 0km发生的迁安 4 .2级地震与观测的电磁场异常和视电阻率的变化有较好的对应性 ,并对产生这些变化的可能的成因机制进行了探讨 ,推测它们是区域应力场和震源区局部构造综合作用的结果。

关键词：超低频/极低频电磁波电磁异常电阻率地震预测资源探测

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A new species of the genus Sinomicrurus(Serpentes:Elapidae)from China and Vietnam

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Zoological research 2020年第2期41卷 194-198页

作者： Qin Liu Jiao-wen Yan Shao-Bing Hou Ping wang Sang Ngoc Nguyen robert w.murphy Jing Che Peng Guo College of Life Sciences and Food Engineering Yibin UniversityYibinSichuan 644007China Fisheries Animal&Veterinary Sciences Bureau of Cangwu CountyWuzhouGuangxi 543115China State Key Laboratory of Genetic resources and Evolution Kunming Institute of ZoologyChinese Academy of SciencesKunmingYunnan 650223China Kunming College of Life Science University of Chinese Academy of SciencesKunmingYunnan 650204China Institute of Tropical Biology Vietnam Academy of Science and Technology(VAST)Ho Chi Minh CityVietnam Centre for Biodiversity and Conservation Biology Royal Ontario MuseumTorontoOntario M5S 2C6Canada

DEAr EDITOr,A new species of Sinomicrurus Slowinski,Boundy,and Lawson,2001 is described herein based on a series of *** new species,Sinomicrurus peinani ***.,occurs in southern China and northern *** peinani *** distinguished from its congeners by the following combination of characters:(1)30-35 black crossbands on body and tail;(2)13 dorsal scale rows throughout,all smooth;(3)white belly with black cross-bands or irregular spots;(4)broad white transverse bar on top of head with inverted V-shaped anterior margin,white bar wider than anterior black bar;and(5)frontal V-like,1.3 times as long as *** addition,new occurrences of *** in Guangxi,China,and Vietnam are discussed.

关键词： black white bands

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barrett食管诊断状况的探讨——经组织学诊断1000例分析

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德国医学 1998年第2期15卷 88-89页

作者： m.Grunewald m.Vieth H.Kreibich B.Bethke m.Stolte 程斌 Institut für Pathologie Klinikum BayreuthPreuschwitzer Str.101D-95445 BayreuthGermany 同济医科大学附属同济医院

在世界上许多发达国家随着胃食管返流性疾病的逐步增加,barrett食管与barrett癌的发病率亦有增加。barrett食管的内镜与组织学诊断、barrett发育不良与barrett早期癌变在将来亦显得越来越重要。人们期望做到,在返流性疾病中尽早发现bar-... 详细信息

在世界上许多发达国家随着胃食管返流性疾病的逐步增加,barrett食管与barrett癌的发病率亦有增加。barrett食管的内镜与组织学诊断、barrett发育不良与barrett早期癌变在将来亦显得越来越重要。人们期望做到,在返流性疾病中尽早发现bar-rett食管的进展,并进行合理的内镜活检检查,以发现在barrett粘膜上发展而来的新生物形成、发育不良与早期癌变。

关键词：食管疾病 barrett食管诊断食管肿瘤

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