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Sökning: WFRF:(Che Xu)

  • Resultat 1-7 av 7
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1.
  • Kristan, Matej, et al. (författare)
  • The Sixth Visual Object Tracking VOT2018 Challenge Results
  • 2018
  • Ingår i: Computer Vision – ECCV 2018 Workshops : Munich, Germany, September 8–14, 2018 Proceedings, Part I. - Cham : Springer Publishing Company. - 9783030110086 - 9783030110093 ; s. 3-53
  • Konferensbidrag (refereegranskat)abstract
    • The Visual Object Tracking challenge VOT2018 is the sixth annual tracker benchmarking activity organized by the VOT initiative. Results of over eighty trackers are presented; many are state-of-the-art trackers published at major computer vision conferences or in journals in the recent years. The evaluation included the standard VOT and other popular methodologies for short-term tracking analysis and a “real-time” experiment simulating a situation where a tracker processes images as if provided by a continuously running sensor. A long-term tracking subchallenge has been introduced to the set of standard VOT sub-challenges. The new subchallenge focuses on long-term tracking properties, namely coping with target disappearance and reappearance. A new dataset has been compiled and a performance evaluation methodology that focuses on long-term tracking capabilities has been adopted. The VOT toolkit has been updated to support both standard short-term and the new long-term tracking subchallenges. Performance of the tested trackers typically by far exceeds standard baselines. The source code for most of the trackers is publicly available from the VOT page. The dataset, the evaluation kit and the results are publicly available at the challenge website (http://votchallenge.net).
2.
  • Wang, Zhaoming, et al. (författare)
  • Imputation and subset-based association analysis across different cancer types identifies multiple independent risk loci in the TERT-CLPTM1L region on chromosome 5p15.33
  • 2014
  • Ingår i: Human Molecular Genetics. - 0964-6906. ; 23:24, s. 6616-6633
  • Tidskriftsartikel (refereegranskat)abstract
    • Genome-wide association studies (GWAS) have mapped risk alleles for at least 10 distinct cancers to a small region of 63 000 bp on chromosome 5p15.33. This region harbors the TERT and CLPTM1L genes; the former encodes the catalytic subunit of telomerase reverse transcriptase and the latter may play a role in apoptosis. To investigate further the genetic architecture of common susceptibility alleles in this region, we conducted an agnostic subset-based meta-analysis (association analysis based on subsets) across six distinct cancers in 34 248 cases and 45 036 controls. Based on sequential conditional analysis, we identified as many as six independent risk loci marked by common single-nucleotide polymorphisms: five in the TERT gene (Region 1: rs7726159, P = 2.10 × 10(-39); Region 3: rs2853677, P = 3.30 × 10(-36) and PConditional = 2.36 × 10(-8); Region 4: rs2736098, P = 3.87 × 10(-12) and PConditional = 5.19 × 10(-6), Region 5: rs13172201, P = 0.041 and PConditional = 2.04 × 10(-6); and Region 6: rs10069690, P = 7.49 × 10(-15) and PConditional = 5.35 × 10(-7)) and one in the neighboring CLPTM1L gene (Region 2: rs451360; P = 1.90 × 10(-18) and PConditional = 7.06 × 10(-16)). Between three and five cancers mapped to each independent locus with both risk-enhancing and protective effects. Allele-specific effects on DNA methylation were seen for a subset of risk loci, indicating that methylation and subsequent effects on gene expression may contribute to the biology of risk variants on 5p15.33. Our results provide strong support for extensive pleiotropy across this region of 5p15.33, to an extent not previously observed in other cancer susceptibility loci.
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3.
  • Kassebaum, Nicholas J, et al. (författare)
  • Global, regional, and national levels and causes of maternal mortality during 1990-2013 : a systematic analysis for the Global Burden of Disease Study 2013
  • 2014
  • Ingår i: The Lancet. - 0140-6736 .- 1474-547X. ; 384:9947, s. 980-1004
  • Tidskriftsartikel (refereegranskat)abstract
    • BACKGROUND: The fifth Millennium Development Goal (MDG 5) established the goal of a 75% reduction in the maternal mortality ratio (MMR; number of maternal deaths per 100 000 livebirths) between 1990 and 2015. We aimed to measure levels and track trends in maternal mortality, the key causes contributing to maternal death, and timing of maternal death with respect to delivery.METHODS: We used robust statistical methods including the Cause of Death Ensemble model (CODEm) to analyse a database of data for 7065 site-years and estimate the number of maternal deaths from all causes in 188 countries between 1990 and 2013. We estimated the number of pregnancy-related deaths caused by HIV on the basis of a systematic review of the relative risk of dying during pregnancy for HIV-positive women compared with HIV-negative women. We also estimated the fraction of these deaths aggravated by pregnancy on the basis of a systematic review. To estimate the numbers of maternal deaths due to nine different causes, we identified 61 sources from a systematic review and 943 site-years of vital registration data. We also did a systematic review of reports about the timing of maternal death, identifying 142 sources to use in our analysis. We developed estimates for each country for 1990-2013 using Bayesian meta-regression. We estimated 95% uncertainty intervals (UIs) for all values.FINDINGS: 292 982 (95% UI 261 017-327 792) maternal deaths occurred in 2013, compared with 376 034 (343 483-407 574) in 1990. The global annual rate of change in the MMR was -0·3% (-1·1 to 0·6) from 1990 to 2003, and -2·7% (-3·9 to -1·5) from 2003 to 2013, with evidence of continued acceleration. MMRs reduced consistently in south, east, and southeast Asia between 1990 and 2013, but maternal deaths increased in much of sub-Saharan Africa during the 1990s. 2070 (1290-2866) maternal deaths were related to HIV in 2013, 0·4% (0·2-0·6) of the global total. MMR was highest in the oldest age groups in both 1990 and 2013. In 2013, most deaths occurred intrapartum or postpartum. Causes varied by region and between 1990 and 2013. We recorded substantial variation in the MMR by country in 2013, from 956·8 (685·1-1262·8) in South Sudan to 2·4 (1·6-3·6) in Iceland.INTERPRETATION: Global rates of change suggest that only 16 countries will achieve the MDG 5 target by 2015. Accelerated reductions since the Millennium Declaration in 2000 coincide with increased development assistance for maternal, newborn, and child health. Setting of targets and associated interventions for after 2015 will need careful consideration of regions that are making slow progress, such as west and central Africa.
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4.
  • Qiu, Minghui, et al. (författare)
  • Observation of Feshbach Resonances in the F + H2 → HF + H Reaction
  • 2006
  • Ingår i: Science. - 0036-8075. ; 311:5766, s. 1440-1443
  • Tidskriftsartikel (refereegranskat)abstract
    • Reaction resonances, or transiently stabilized transition-state structures, have proven highly challenging to capture experimentally. Here, we used the highly sensitive H atom Rydberg tagging time-of-flight method to conduct a crossed molecular beam scattering study of the F + H2 → HF + H reaction with full quantum-state resolution. Pronounced forward-scattered HF products in the v′ = 2 vibrational state were clearly observed at a collision energy of 0.52 kcal/mol; this was attributed to both the ground and the first excited Feshbach resonances trapped in the peculiar HF(v′ = 3)-H′ vibrationally adiabatic potential, with substantial enhancement by constructive interference between the two resonances.
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5.
  • Sterner, Thomas, 1952-, et al. (författare)
  • Funding Inclusive Green Transition through Greenhouse Gas Pricing
  • 2020
  • Ingår i: ifo DICE Report. - 2511-7815. ; 18:1, s. 03-08
  • Tidskriftsartikel (refereegranskat)abstract
    • 2015 was a special year. During a few months the political stars aligned and made it possible for the international community to agree on the Agenda 2030 for Sustainable Development and the Paris Agreement to limit global warming. Now the signatories need to find ways to implement these agreements, which not only imply a deep decarbonization of the economy but must also meet the Sustainable Development Goals. In this article we discuss the importance of pricing greenhouse gas (GHG) emissions2 to make this happen. Climate abatement is a truly global public good and so we actually have to have a functioning policy in all countries. Our interest is thus on pricing in all countries but in particular the developing countries that are bigger and most crucial to the struggle for a green transition.
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6.
  • Xu, Dongdong, et al. (författare)
  • A design concept of amphiphilic molecules for directing hierarchical porous zeolite
  • 2016
  • Ingår i: New Journal of Chemistry. - 1144-0546 .- 1369-9261. ; 40:5, s. 3982-3992
  • Forskningsöversikt (refereegranskat)abstract
    • Aluminosilicate zeolites with hierarchically porous systems have attracted special scientific interest due to their advantages in bulky molecule catalysis. Organic amphiphilic molecules or surfactants are frequently employed in the hydrothermal syntheses of porous zeolites for the construction of enhanced pore systems (mesopores or macropores) beyond sole micropores. This review describes a design concept of novel amphiphilic molecules for a one-step preparation of hierarchically porous zeolites containing mesopores with certain orders. Via a structural-directing mechanism study of the most common surfactant (cetyltrimethyl ammonium bromide, CTAB) in the synthesis of bulk zeolite MFI (zeolite framework code given by the International Zeolite Association), aromatic groups were grafted into the hydrophobic tail of the amphiphilic molecule. Due to the pi-pi stacking of the aromatic groups and a geometrical match between their arrangement and the zeolitic framework, single-crystalline zeolite nanosheets (SCZNs) were successfully synthesized. Furthermore, following the same idea for the design, bolaform and triply branched amphiphilic molecules with aromatic groups were also prepared and used for the formation of SCZNs with a 90 degrees rotational boundary and single-crystalline mesoporous ZSM-5 with three-dimensional pores, respectively. This design concept will provide a new insight into the molecular factors for governing the simultaneous fabrication of ordered meso-and micro-phases.
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7.
  • Xu, Dongdong, et al. (författare)
  • pi-pi interaction of aromatic groups in amphiphilic molecules directing for single-crystalline mesostructured zeolite nanosheets
  • 2014
  • Ingår i: Nature Communications. - 2041-1723 .- 2041-1723. ; 5
  • Tidskriftsartikel (refereegranskat)abstract
    • One of the challenges in material science has been to prepare macro-or mesoporous zeolite. Although examples of their synthesis exist, there is a need for a facile yet versatile approach to such hierarchical structures. Here we report a concept for designing a single quaternary ammonium head amphiphilic template with strong ordered self-assembling ability through pi-pi stacking in hydrophobic side, which stabilizes the mesostructure to form single-crystalline mesostructured zeolite nanosheets. The concept is demonstrated for the formation of a new type of MFI (zeolite framework code by International Zeolite Association) nanosheets joined with a 90 degrees rotational boundary, which results in a mesoporous zeolite with highly specific surface area even after calcination. Low binding energies for this self-assembling system are supported by a theoretical analysis. A geometrical matching between the arrangement of aromatic groups and the zeolitic framework is speculated for the formation of single-crystalline MFI nanosheets.
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