检索结果-南通市图书馆

npj Computational Materials 2023年第1期9卷 639-648页

作者： Andrij Vasylenko Dmytro Antypov vladimir V.Gusev Michael W.Gaultois Matthew S.Dyer Matthew J.Rosseinsky Department of Chemistry University of LiverpoolCrown StreetLiverpool L697ZDUnited Kingdom Department of Computer Science University of LiverpoolAshton StreetLiverpool L693BXUnited Kingdom

The unique nature of constituent chemical elements gives rise to fundamental differences in *** materials based on their phase fields,defined as sets of constituent elements,before specific differences emerge due to composition and structure can reduce combinatorial complexity and accelerate screening,exploiting the distinction from composition-level *** and evaluation of novelty of materials classes align with the experimental challenge of identifying new areas of *** address this,we present PhaseSelect,an end-to-end machine learning model that combines representation,classification,regression and novelty ranking of phase *** leverages elemental characteristics derived from computational and experimental materials data and employs attention mechanisms to reflect the individual element contributions when evaluating functional performance of phase *** demonstrate this approach for high-temperature superconductivity,high-temperature magnetism,and targeted bandgap energy applications,showcasing its versatility and potential for accelerating materials exploration.

关键词： materials phase elements

Active-layer Soil Moisture Content Regional Variations in Alaska and Russia by Ground-Based and Satellite-Based Methods, 2002 through 2014

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Geosciences 2015年第1期6卷 12-41页

作者： Reginald R. Muskett vladimir E. Romanovsky William l. Cable Alexander l. Kholodov Geophysical Institute University of Alaska Fairbanks Fairbanks USA Tyumen State Oil and Gas University Tyumen Russia

Soil moisture is a vital physical parameter of the active-layer in permafrost environments, and associated biological and geophysical processes operative at the microscopic to hemispheric spatial scales and at hourly to multi-decadal time scales. While?in-situ?measurements can give the highest quality of information on a site-specific basis, the vast permafrost terrains of North America and Eurasia require space-based techniques for assessments of cause and effect and long-term changes and impacts from the changes of permafrost and the active-layer. Satellite-based 6.925 and 10.65 GHz sensor algorithmic retrievals of soil moisture by Advanced Microwave Scanning Radiometer-Earth Observation System (AMSR-E) onboard NASA-Aqua and follow-on AMSR2 onboard JAXA-Global Change Observation Mission—Water-1 are ongoing since July 2002. Accurate land-surface temperature and vegetation parameters are critical to the success of passive microwave algorithmic retrieval schemes. Strategically located soil moisture measurements are needed for spatial and temporal co-location evaluation and validation of the space-based algorithmic estimates. We compare on a daily basis ground-based (subsurface-probe) 50- and 70-MHz radio-frequency soil moisture measurements with NASA- and JAXA-algorithmic retrieval passive microwave retrievals. We find improvements in performance of the JAXA-algorithm (AMSR-E reprocessed and AMSR2 ongoing) relative to the earlier NASA-algorithm version. In the boreal forest regions, accurate land-surface temperatures and vegetation parameters are still needed for algorithmic retrieval success. Over the period of AMSR-E retrievals, we find evidence of at the high northern latitudes of growing terrestrial radio-frequency interference in the 10.65 GHz channel soil moisture content. This is an important error source for satellite-based active and passive microwave remote sensing soil moisture retrievals in Arctic regions that must be addressed.

关键词： Soil Moisture Active layer Radio Microwave Remote Sensing AMSR-E AMSR2 NASA JAXA Alaska Russia

Development of high-coercivity state in melt-spun Fe41Pd41B8Si6P4 ribbons

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2020年第1期39卷 76-83页

作者： Oksana Aleksandrovna Golovnia Nina Ivanovna Vlasova Aleksandr Gervasievich Popov Vasiliy Semenovich Gaviko vladimir vladimirovich Popov Jr. Andrey vladimirovich Protasov Arti Kashyap M.N.Miheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences EkaterinburgRussia620990 Institute of Natural Sciences and Mathematics Ural Federal UniversityEkaterinburgRussia620002 Israel Institute of Metals Technion R&D FoundationTechnion City3200003HaifaIsrael Indian Institute of Technology Mandi KamandMandiHP175005India

The phase transformation and magnetic hysteresis properties of melt-spun Fe41 Pd41 B8 Si6 P4 ribbons subjected to the annealing at temperatures of 500-550℃were studied after holding for 0.1-60.0 h by transmission electron microscopy(TEM),X-ray diffraction(XRD)and thermomagnetic *** additions of P,B and Si to the FePd alloy allowed us to achieve the coercivity of124 kA·m-1,which is 2.6 times higher than that of the melt-spun ribbons of the binary equiatomic FePd *** high-coercivity Fe41Pd41B8 Si6 P4 alloy is nanocrystalline and is composed of the ordered l10-phase grains approximately 40 nm in size and inclusions of the Fe2(P,B)and Pd2(Si,B)*** coercivity kinetics is controlled by the phase transformation which can be divided into three stages:transformation from the bcc structure to nanosized regions of the fee and Fe2 P phases;transformation from the fee to l10 nanosized regions with somewhat different degrees of tetragonality and their ordering;and extensive growth of the weight fraction of l10 phase from the fee nanosized regions.P and B atoms occupy interstitial sites in the iron plane of l10 lattice,thus decreasing its Curie temperature(TC).

关键词： Fe-Pd-P-B-Si Melt spinning l10 Nanostructured materials Phase transformation Magnetic measurements

Genetic reporter analysis reveals an expandable reservoir of OCT4+cells in adult skin

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Cell Regeneration 2014年第1期3卷 63-68页

作者： Anne limbourg Sabine Schnabel vladimir J lozanovski l Christian Napp Teng-Cheong Ha Tobias Maetzig Johann Bauersachs Hassan Y Naim Axel Schambach Florian P limbourg Research Group Regenerative Agents HannoverGermany REBIRTH Cluster of Excellence HannoverGermany Integrated Research Center Transplantation(IFB-Tx) HannoverGermany Current affiliation:Department of Plastic Hand and Reconstructive SurgeryHannoverGermany Department of Cardiology and Angiology HannoverGermany Institute of Experimental Hematology OE6960 Hannover Medical SchoolCarl-Neuberg-Str.1D-30625 HannoverGermany Department of Physiological Chemistry Hannover Veterinary SchoolHannoverGermany Division of Hematology/Oncology Boston Children’s HospitalHarvard Medical SchoolHarvardUSA Department of Nephrology and Hypertension Hannover Medical SchoolHannoverGermany Department of General and Transplant Surgery University Hospital HeidelbergHeidelbergGermany Vascular Medicine and Transplantation Research Dept.of Nephrology and HypertensionOE 6841Hannover Medical SchoolCarl-Neuberg-Str.1D-30625 HannoverGermany

The transcription factor Oct4(Pou5f1)is a critical regulator of pluripotency in embryonic and induced pluripotent stem ***,Oct4 expression might identify somatic stem cell populations with inherent multipotent potential or a propensity for facilitated ***,analysis of Oct4 expression is confounded by Oct4 pseudogenes or non-pluripotency-related *** analysis of a transgenic Oct4-EGFP reporter mouse identified testis and skin as two principle sources of Oct4^(+)cells in postnatal *** the prevalence of GFP^(+)cells in testis rapidly declined with age,the skin-resident GFP^(+)population expanded in a cyclical *** cells were identified as epidermal stem cells dwelling in the stem cell niche of the hair follicle,which endogenously expressed all principle reprogramming factors at low ***,skin wounding or non-traumatic hair removal robustly expanded the GFP^(+)epidermal cell pool not only locally,but also in uninjured skin areas,demonstrating the existence of a systemic ***,the epithelial stem cell niche of the hair follicle harbors an expandable pool of Oct4^(+)stem cells,which might be useful for therapeutic cell transfer or facilitated reprogramming.

关键词： Oct4 Epidermal stem cells Skin Transgenic reporter mice

Azithromycin in a triple therapy for *** eradication in active duodenal ulcer

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2002年第5期8卷 879-882页

作者： vladimir T.Ivashkin Tatiana l.lapina Oksana Yu.Bondarenko Olga A. Sklanskaya Petr Va.Grigoriev Yuri V.Vasiliev Emilia P.Yakovenko Pavel V.Gulyaev Valeri I.Fedchenko V.Vasilenko Clinic of internal diseases gastroenterology and hepatology of the Moscow Sechenov Medical Academy119881 Pogodinskaya 5MoscowRussia Pathology Department of the Moscow Sechenov Medical Academy 119881Trubetskaya 8MoscowRussia Gastroenterological Center of the Health Ministry of Russia 105203N.Pervomayskaya ul.70MoscowRussia Central Institution of Gastroenterology 111123Sh.Entusiastov 86MoscowRussia

AIM:To assess and compare the efficacy and safety of two triple regimes:A)metronidazole,amoxicillin and omeprazole, which is still widely used in Russia,and B)azithromycin, amoxicillin and omeprazole in healing active duodenal ulcer and *** eradication. METHODS:100 patients with active duodenal ulcer were included in the open,multicentre,randomized study with comparative *** were randomly assigned to one of the following one-week triple regimes:A) metronidazole 500 mg bid,amoxicillin I g bid and omeprazole 20 mg bid(OAM,n=50)and B)azithromycin 1 god for the first 3 days(total dose 3 g),amoxicillin 1 g bid and omeprazole 20 mg bid(OAA,n=50).Omeprazole 20 mg od was given after the eradication course as a monotherapy for three *** control endoscopy was performed 8 weeks after the *** was determined in the entry of the study and four weeks after the cessation of treatment by means of histology and ClO-test. RESUlTS:97 patients completed the study according to the protocol(1 patient of the OAM group did not come to the control endoscopy,2 patients of the OAA group stopped the treatment because of mild allergic urticaria).Duodenal ulcers were healed in 48 patients of the OAM group(96 %, C190.5-100 %)and in 46 patients of the OAA group(92 %, CI 89.5-94.5 %)(p=ns).*** was eradicated in 15 out of 50 patients with OAM(30 %,CI 17-43 %)and in 36 out of 50 patients treated with OAA(72 %;CI 59-85 %) (Ple therapy with omeprazole, amoxicillin and metronidazole failed to eradicate ***'vc\ the majority of patients, which is an essential argument to withdraw this regimen out of the national recommendations. Macrolide with amoxicillin are preferable to achieve higher eradication rates. Azithromycin (1 g od for the first 3 days) can be considered as a successful component of the triple PPI-based regimen.

关键词： Helicobacter pylori Adolescent Adult Aged Amoxicillin dosage Anti-Bacterial Agents Anti-Ulcer Agents Azithromycin Comparative Study Drug Therapy, Combination Duodenal Ulcer Female Helicobacter Infections Humans Male Metronidazole Middle Aged Omeprazole Penicillins Research Support, Non-U.S. Gov't Treatment Outcome

Effects of Substrate Pulse Bias Duty Cycle on the Microstructure and Mechanical Properties of Ti–Cu–N Films Deposited by Magnetic Field-Enhanced Arc Ion Plating

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English letters) 2017年第2期30卷 176-184页

作者： Sheng-Sheng Zhao Yan-Hui Zhao lv-Sha Cheng vladimir Viktorovich Denisov Nikolay Nikolaevich Koval Bao-Hai Yu Hai-Juan Mei School of Mechanical and Electrical Engineering Shenzhen Polytechnic Institute of Metal Research Chinese Academy of Sciences Institute of High Current Electronics Siberian BranchRussian Academy of Sciences

Ti–Cu–N films were deposited on 316 l stainless steel substrates by magnetic field-enhanced arc ion *** effect of substrate pulse bias duty cycle on the chemical composition,microstructure,surface morphology,mechanical and tribological properties of the films was systemically *** results showed that,with increasing the duty cycle,Cu content decreases from 3.3 to 0.58 at.%.XRD results showed that only Ti N phase is observed for all the deposited films and the preferred orientation transformed from Ti N（200） to Ti N（111） plane with the increase in duty *** surface roughness and deposition rate showed monotonous decrease with increasing the duty *** residual stress and hardness firstly increase and then decrease afterwards with the increase in duty cycle,while the variation of critical load shows reverse *** for the film with duty cycle of 10%,others perform the better wear resistance.

关键词： Magnetic field Arc ion plating Ti-Cu-N film Residual stress Hardness

Ocular flora in patients undergoing intravitreal injections: antibiotic resistance patterns and susceptibility to antiseptic picloxydine

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2020年第1期13卷 85-92页

作者： Maria V.Budzinskaya Anait S.Khalatyan Marina G.Strakhovskaya vladimir G.Zhukhovitsky Scientific Research Institute of Eye Diseases Moscow 119021Russia Department of Biology Lomonosov Moscow State UniversityMoscow 119234Russia Federal Research and Clinical Center of Specialized Medical Care and Medical Technologies Federal Medical and Biological Agency of RussiaMoscow 115682Russia Gamaleya National Research Centre for Epidemiology and Microbiology Moscow 123098Russia

AIM: To study antibiotic resistance patterns and susceptibility to eye antiseptic picloxydine of conjunctival flora in patients undergoing intravitreal injections(IVIs).METHODS: Conjunctival swabs were taken in 4 groups of patients, 20 patients in each group(n=80): without IVIs and ophthalmic operations in history(group N1;control group);with the first IVI and antibiotic eye drops Tobrex applied 3 d before IVI and 5 d after it(group N2);with 20 or more IVIs and repeated courses of antibiotic eye drops(group N3);with the first IVI and antiseptic eye drops Vitabact(picloxydine) applied 3 d before IVI and 5 d after it(group N4). In groups N2 and N4 swabs were taken at baseline and after the treatment. Efficacy of picloxydine in inhibition of growth of conjunctival isolates susceptible and resistant to antibiotic was studied in vitro. Minimal inhibition concentrations(MIC) were determined with microdilution ***: Two of the three patients who had to undergo the IVI procedure showed conjunctiva bacterial contamination. Along with few Staphylococcus aureus and Gram-negative isolates susceptible to most antibiotics, the majority(71%-77%) of causative agents were coagulase-negative Staphylococci(Co NS), 40%-50% of which were multidrug resistant(MDR). Eye disinfection in the operating room and peri-injection courses of Tobrex or Vitabact resulted in total elimination of isolates found at baseline. However, in 10% and 20% of patients, respectively, recolonization of the conjunctiva with differing strains occurred. In patients with repeated IVI and Tobrex/Maxitrol treatment, the conjunctival flora showed high resistance rates: 90% of Co NS were MDR. In the in vitro study, picloxydine showed bactericidal effect against Staphylococci isolates both antibiotic resistant and susceptible with MIC≥13.56 μg/m l. Incubation of bacteria for 15 min in Vitabact eye drops, commercially available form of picloxydine, 434 μg/m l, showed total loss of colony forming units of all teste

关键词： intravitreal injections conjunctival isolates antibiotic resistance picloxydine Vitabact

Mathematical Modelling of the Micromicetes Colonies Growth Applying the Diffusion Equation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Microbiology 2013年第8期3卷 7-10页

作者： Albina R. Idiyatullina liya l. Vodopyanova vladimir V. Vodopyanov Ufa State Aviation Technical University Ufa Russia

We have studied the mathematical model of the growth of a micromycetes colony. The results of the numerical experiments have shown that the model given in the work quite adequately reflects the emergence of the ring s... 详细信息

关键词： Mathematical Models Micromicetes

Modification of titanium surface via Ag-,Sr-and Si-containing micro-arc calcium phosphate coating

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Bioactive Materials 2019年第1期4卷 224-235页

作者： Mariya B.Sedelnikova Ekaterina G.Komarova Yurii P.Sharkeev Anna V.Ugodchikova Tatiana V.Tolkacheva Julietta V.Rau Evgeny E.Buyko vladimir V.Ivanov vladimir V.Sheikin Institute of Strength Physics and Materials Science of SB RAS Academicheskii Prospect 2/4Tomsk634055Russia National Research Tomsk Polytechnic University Lenina Prospect 30Tomsk634050Russia Istituto di Struttura della Materia Consiglio Nazionale delle Ricerche(ISM-CNR)Via del Fosso del Cavaliere 10000133 RomaItaly Siberian State Medical University Moscovskii Tract 2Tomsk634050Russia

The current research is devoted to the study of the modification of the titanium implants by the micro-arc oxidation with bioactive calcium phosphate coatings containing Ag or Sr and Si *** coatings’microstructure,phase composition,morphology,physicochemical and biological properties were examined by scanning electron microscopy(SEM),transmission electron microscopy(TEM),energy-dispersive X-ray spectroscopy(EDX)and X-ray diffraction(XRD).Ag-containing and Sr-Si-incorporated coatings were formed in alkaline and acid electrolytes,*** formation of the coatings occurred at different ranges of the applied voltages,which led to the significant difference in the coatings *** trace elements Ag,Sr and Si participated intensively in the plasma-chemical reactions of the micro-arc coatings ***-containing coatings demonstrated strong antibacterial effect against Staphylococcus aureus AТСС*** in vitro test with 3T3-l1 fibroblasts showed no cytotoxicity appearance on Sr-Si-incorporated coatings.

关键词： Trace elements Biocoatings Micro-arc oxidation Titanium substrate Antibacterial activity

Resolution and contrast enhancement of laser-scanning multiphoton microscopy using thulium-doped upconversion nanoparticles

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2019年第12期12卷 2933-2940页

作者： Alexey B.Kostyuk Artem D.Vorotnov Andrey V.Ivanov Arthur B.Volovetskiy Aleksandr V.Kruglov lyudmila M.Sencha liuen liang Evgenii l.Guryev vladimir A.Vodeneev Sergey M.Deyev Yiqing lu Andrei V.Zvyagin lobachevsky State University of Nizhny Novgorod Nizhny Novgorod 603950Russia Center of Biomedical Engineering Institute of Molecular MedicineSechenov UniversityMoscow 119991Russia ARC Centre of Excellence"Nanoscale BioPhotonics" Department of Physics and AstronomyMacquarie UniversitySydney 2109Australia Institute ofBioorganic Chemistry Russian Academy of SciencesMoscow 117997Russia

High-contrast optical imagi ng is achievable using phosphoresce nt labels to suppress the short-lived background due to the optical backscatterand autofluoresce ***,the long-lived phosphorescence is generally incompatible with high-speed laser-scan ning imaging ***,we show that upc on versi on nan oparticles of structure NaYF4:Yb co-doped with 8%Tm(8T-UCNP)in combi nation with a commerciallaser-scanning multiphoton microscopy are uniquely suited for labeling biological systems to acquire high-resolution images with the enhancedcon *** comparison with many phosphoresce nt labels,the 8T-UCNP emission lifetime of-15μs affords rapid image ***-order optical nonlinearity of the 8T-UCNP(n=4,as confirmed experimentally and theoretically)afforded pushing the resolution limitattain able with UCNPs to the *** contrast enha nceme nt was achieved by suppressing the backgro und using(i)ban dpassspectral filtering of the narrow emission peak of 8T-UCNP at 455-nm,and(ii)time-gating implemented with a time-correlated single-photon counting system that demonstrated the contrast enhancement of>2.5-fold of polyethyle neimine-coated 8T-UCNPs take n up by huma nbreast adeno carcinoma cells *** a result,discrete 8T-UCNP nan oparticles became clearly observable in the freshly excised splee ntissue of laboratory mice 15-min post in trave nous injectio n of an 8T-UCNP *** dem on strated approach paves the way forhigh-contrast,high-resoluti on,and high-speed multiphot on microscopy in challe nging envir onments of i ntense autofluorescence,exogenous staining,and turbidity,as typically occur in intravital imaging.

关键词： upconversion nanoparticles autofluorescence time-gated imaging scanning microscopy time-correlated single photon counting