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原位透射电镜研究双辊铸造AA8079铝合金的均匀化过程

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Transactions of Nonferrous Metals Society of China 2022年第7期32卷 2138-2149页

作者： R.krÁLÍK B.KŘIVSKÁ L.BAJTOŠOVÁ M.ŠLAPÁKOVÁ M.CIESLAR Faculty of Mathematics and Physics Charles UniversityKe Karlovu 312116 Prague 2Czechia

AA8079铝合金是一种常用的制造薄包装箔的胚料,其主要的合金化元素Fe和Si可以形成二元和三元金属间化合物。采用原位透射电镜模拟铸态材料均匀化退火,分析这些颗粒的形状、类型和分布的实时变化,它们影响最终产品的力学性能、材料对形... 详细信息

AA8079铝合金是一种常用的制造薄包装箔的胚料,其主要的合金化元素Fe和Si可以形成二元和三元金属间化合物。采用原位透射电镜模拟铸态材料均匀化退火,分析这些颗粒的形状、类型和分布的实时变化,它们影响最终产品的力学性能、材料对形成气孔和其他宏观缺陷的敏感性。对另一组铸态样品在模拟工业热处理制度范围内进行退火处理,并结合电阻率测量,验证原位试验的结果。结果表明,在450℃以上的原始颗粒球化、475℃的新颗粒成核、525℃以上的颗粒粗化以及550℃以上的原始颗粒完全溶解等几个阶段发生了回复、基体去饱和以及相变,且具有明显的温度区间。

关键词：铝合金原位退火均匀化箔胚料

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人参、白芍和紫河车混合提取物生血丹的生血作用

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Acta Pharmacologica Sinica 2003年第2期24卷 120-126页

作者： dju.ac.kr Department of Internal Medicine College of Oriental Medicine Daejeon University Daejeon 301-724 Vaccine Institute Seoul National University Campus 151-742 Institute of Traditional Medicine and Bioscience Daejeon University 韩国 Daejeon 301-724

AIM: To examine the efficacy of Saenghyuldan and its components, Ginseng Radix, Paeoniae Radix Alba, and Hominis Placenta extracts (SHD, GR, PRA, and HP, respectively) on the hemopoiesis in a myelosuppression model system. METHODS: Susceptibility to cyclophosphamide (CP) and S 180 carcinoma was determined in SHD, GR,PRA, and HP-treated mice. Analysis of peripheral blood and bone marrow cells was demonstrated by changes in cell types and histopathologic examination. The expression of cytokine mRNAs involved in hemopoiesis was examined by RT-PCR. RESULTS: SHD and its seperated components (GR, HP, and PRA, respectively) significantly increased the survival in CP-and S 180-treated mice. The hematology data demonstrated that all the agents augmented monocyte and leucocyte counts in the peripheral blood and increased bone marrow density and the ratio of leukocyte to erythrocyte in the bone marrow. These findings were positively correlated with the up-regulation of cytokine mRNA expression such as granulocyte colony-stimulating factor (GM-CSF), erythropoietin (EPO), thrombopoietin (TPO), stem cell factor (SCF), and c-Kit. CONCLUSION: SHD is an effective remedy for the bone marrow failure and myelosuppression occurring during chemotherapy.

关键词：生血丹人参白芍紫河车血细胞生成

Variation of shearwave splitting in earthquake clusters with very similar waveforms

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Acta Seismologica Sinica(English Edition) 2000年第5期13卷 536-543页

作者：王培德 K. Klinge F. krüger T. Plenefisch Institute of Geophysics China Seismological Bureau Beijing China Graefenberg Central Seismological Observation Erlangen Germany

Among the records of aftershock observation of the 1991 Datong, China ML=5.8 earthquake, very similar waveforms from clusters of small earthquakes were found. Cross-correlation of the waveforms of each pair in the cluster confirmed the similarities. Re-sample technology is used to improve the sampling rate, which is helpful to distinguish the small variation of shear wave splitting. The variation of shear wave splitting could be found directly from seismograms of each pair in a cluster.

关键词： earthquake cluster shearwave splitting Datong

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Cold adaptation strategy of psychrophilic bacteria:an in-silico analysis of isocitrate dehydrogenase

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Systems Microbiology and Biomanufacturing 2021年第4期1卷 483-493页

作者： Debanjan Mitra Pradeep kr.Das Mohapatra Department of Microbiology Raiganj UniversityRaiganjWBIndia

Non-specific electrostatics is crucial for structure and stability;recently,it has been argued that psychrophilic proteins may also utilize specific electrostatic *** psychrophilic proteins increase the number of salt bridges for cold adaptation?Are there any changes that occur in their sequence,which helps them to adapt in an extreme environment?Do intra-protein interactions affect their stability?Is there any special type of intra-protein interaction present in psychrophilic protein structure?This study will give all those ***(n~100)and structures of psychrophilic isocitrate dehydrogenase and mesophilic isocitrate dehydrogenase extracted from *** had been analyzed in BLOCK and non-BLOCK *** sequences of psychrophiles and mesophiles create two separate *** number of charged and uncharged polar residues is very much high in psychrophilic *** formation of long network aromatic-aromatic interactions and network aromatic-sulfur interactions are very crucial for psychrophilic protein *** of these types of interactions is also a novelty of this *** mutation of charged residues with high-energy contributions affects the protein *** study will help in protein engineering.

关键词： Cold adaptation Aromatic-aromatic interactions Aromatic-sulfur interactions Non-covalent interactions Mutation

Single zircon evaporation ages: Evidence for the Mesoproterozoic crust in the southeastern Nigerian basement complex

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Chinese Journal Of Geochemistry 2012年第1期31卷 48-54页

作者： Ekere E.Ukwang Barth N.Ekwueme Alfred krner Department of Geology University of CalabarEtta AgborP.M.B.1115 CalabarNigeria Institut fur Geowissenschaften Universitat MainzGermany

The Ukwortung area of the Obudu Plateau exposes high-grade metamorphic rocks of upper amphibolite to granulite facies. Zircon grains from three locations of Southwest Obudu Plateau were dated by the Pb-Pb dating method. This single zircon radiometric dating method confirms the occurrence of Mesoproterozoic crust in the southeastern Nigeria basement complex. The pyroxene gneiss (granulite facies) sample from Biereberi near Ukpe yielded a mean age of 2061.4±0.4 Ma, suggesting the presence of Paleoproterozoic crust. The combined 207Pb/206Pb ratios from the garnet-biotite gneiss in the area gave a mean age of 1794.4±0.4 Ma. This further confirms the pres-ence of Paleoproterozoic crustal components within the Obudu Plateau. The Mesoproterozoic (1548.8±0.5 Ma) and Neoproterozoic (619.8±0.9 Ma) ages were obtained from two populations of zircon grains from the leucogranite in Okordem, Southwest Obudu. These "signatures" collaborate the occurrence of Mesoproterozoic ages in the Afar region and Cameroon basements along with the southeastern Nigerian basement complex, constituting the major portion of the West Central African mobile belt. The zircon age of 1794.4±0.4 Ma may probably be the maximum depositional age of the meta-sediment (garnet-biotite gneiss) and the age of 1548.8±0.5 Ma may be interpreted as the time of emplacement of the granitoid. The Neoproterozoic age (619.8±0.9 Ma) probably records the metamorphic event that was prevalent during the Pan-African period and thus affected the area.

关键词：单颗粒锆石平均年龄地壳成分中元古代尼日利亚地下室东南部证据

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Effect of IOP based infusion system with and without balanced phaco tip on cumulative dissipated energy and estimated fluid usage in comparison to gravity fed infusion in torsional phacoemulsification

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Eye and Vision 2017年第1期4卷 127-136页

作者： Praveen K.Malik Taru Dewan Arun kr Patidar Ekta Sain Dr Ram Manohar Lohia Hospital New DelhiIndia

Background:To evaluate the effect of three different combinations of tip designs and infusion systems in torsional phacoemulsification(INFINITI and CENTURION)in patients with *** to the manufacturer,two unique improvements in the Centurion are:active fluid dynamic management system and use of an intrepid balanced *** study specifically aimed to evaluate the beneficial effects,if any,of change in tip design and infusion system individually and in combination on both per-operative parameters as well as endothelial health over 6 ***:One hundred and twenty six consenting patients of grade 4.0-6.9 senile cataract were randomized into three groups for phacoemulsification:Group A(n=42):Gravity fed infusion system and 45° Kelman miniflared ABS phaco tip;Group B(n=42):intraocular pressure(IOP)based infusion system and 45° Kelman miniflared ABS phaco tip;Group C(n=42):IOP based infusion system and 45° Intrepid balanced phaco *** cumulative dissipated energy(CDE),estimated fluid usage(EFU)and total aspiration time(TAT)were compared *** endothelial parameters were followed up postoperatively for six ***:The three arms were matched for age(p=0.525),gender(p=0.96)and grade of cataract(p=0.177).Group C was associated with significant reductions in CDE(p=0.001),EFU(p<0.0005)as well as TAT(p=0.001)in comparison to the other *** three groups had comparable baseline endothelial cell density(p=0.876)and central corneal thickness(p=0.561).On post-operative evaluation,although all groups were comparable till 3 months,by 6 months,the percentage losses in endothelial cell density were significantly lower in group C as compared to the other ***:Use of an IOP based phacoemulsification system in association with use of the Intrepid balanced tip reduces the CDE,EFU and TAT in comparison to a gravity fed system with a mini flared tip or IOP based system with a mini flared tip while also providing better endothelia

关键词： Active fluidics CENTURION active Centurion IOP based infusion Torsional Phacoemulsification Intrepid balanced tip Kelman miniflared tip Gravity based infusion Cumulative dissipated energy

On Higher Order Pyramidal Finite Elements

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Advances in Applied Mathematics and Mechanics 2011年第2期3卷 131-140页

作者： Liping Liu Kevin B.Davies Michal krızek Li Guan Department of Mathematical Sciences Lakehead University955 Oliver RoadThunder BayOntarioP7B 5E1Canada Institute of Mathematics Academy of SciencesZitna 25CZ-11567 Prague 1Czech Republic College of Computer Science Dongguan University of TechnologyDongguan 523808GuangdongChina

In this paper we first prove a theorem on the nonexistence of pyramidal polynomial basis *** we present a new symmetric composite pyramidal finite element which yields a better convergence than the nonsymmetric *** has fourteen degrees of freedom and its basis functions are incomplete piecewise triquadratic *** space of ansatz functions contains all quadratic functions on each of four subtetrahedra that form a given pyramidal element.

关键词： Pyramidal polynomial basis functions finite element method composite elements three-dimensional mortar elements.

Bioactive potential of the wild edible mushroom Ramaria versatilis

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Studies in Fungi 2020年第1期5卷 73-83页

作者： Dattaraj HR Sridhar kr Jagadish BR Pavithra M Department of Biosciences Mangalore UniversityMangalagangotriMangaloreKarnatakaIndia Centre for Environmental Studies Yenepoya(deemed to be)UniversityMangaloreKarnatakaIndia

The scrub jungles of the southwestern India support different mushrooms of economic *** coral mushrooms belong to the genus Ramaria distributed worldwide and many species are edible,medicinal and *** versatilis occurring in scrub jungles were analyzed for biochemical profile and antioxidant *** tests of uncooked samples showed presence of saponins,flavonoids,alkaloids,terpenoids and coumarins,whereas the cooked samples possess saponins,alkaloids,terpenoids,cardiac glycosides and *** assessment revealed significantly higher quantities of total phenolics as well as vitamin C in uncooked than cooked *** total antioxidant activity,ferrous ion-chelation capacity and DPPH radical-scavenging activity were also significantly high in uncooked ***,substrates,mycorrhizal association and edibility of different Ramaria occurring in the Western Ghats region have been reviewed with comparison of nutritional and antioxidant potential of *** with other Ramaria spp.

关键词： Antioxidant activities bioactive compounds ectomycorrhizae−scrub jungles

An Intelligent Coordinated Protection and Control Strategy for Distribution Network with Wind Generation Integration

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CSEE Journal of Power and Energy Systems 2016年第4期2卷 23-30页

作者： Zhou Liu Hans kr.Høidalen Murari Mohan Saha Electrical Power Engineering Department Norwegian University of Science and Technology(NTNU)TrondheimNO 7491Norway Grid Automation Product ABB AB72244Vasteras Sweden

Integration of distributed generation(DG)can change the fault current level and direction in the distribution system,which affects the related protection *** order to limit the negative impact of DG integration and upgrade the protection system performance,an intelligent coordinated protection and control strategy is proposed.A cost based optimization method is adopted to minimize the operation costs of possible *** aim is to define the optimal relay settings for the present operation condition,and the most suitable control mode of converter based wind turbine *** studies on a hardware in the loop real time simulation platform demonstrate the proposed protection strategy.

关键词： Converter based wind turbine DG coordinated protection and control hardware in the loop real time simulation