1,488 research outputs found
Trust, Criticality, & the Open Web: Three Approaches to Teaching Lateral Reading
Presentation presented at 2021 ACRL conference.
Learning objectives: Become familiar with the practice and importance of lateral reading (LR) and the skills and mindsets it involves. Become familiar with different approaches to teaching LR and challenges of learning and teaching about it. Reflect on the potential relevance and applications of LR in your own teaching context.
Description:
Lateral reading - the process of moving off of a webpage to see what others say about it - has become critical for effectively evaluating online sources. While lateral reading appears simple, teaching it reveals layers of complexity, which include deciding where to place one’s trust; how some voices are privileged while others are marginalized; and the impulse of many online readers to focus more on surface features of web sources over more critical questions and analysis. Presenters from three institutions will share about their varied experiences teaching lateral reading to undergraduate students: in a credit-bearing information literacy course that explored information ethics and social justice in relation to networked media systems; through a scaffolded online tutorial through which students practice source evaluation with lateral reading; and in flipped information literacy instruction sessions designed for first-year writing classes on investigating sources and finding better coverage for news stories
Gluon dipole penguin contributions to and CP violation in Hyperon decays in the Standard Model
We consider the gluon dipole penguin operator contributions to
and CP violation in hyperon decays. It has been proposed
by Bertolini et al. that the contribution to may be
significant. We show that there is a cancellation in the leading order
contribution and this contribution is actually suppressed by a factor of order
O(. We find that the same operator also contributes
to CP violation in hyperon decays where it is not suppressed. The gluon dipole
penguin operator can enhance CP violation in hyperon decays by as much as 25\%.Comment: 11pages, Revte
Thermal stability of aqueous polyurethanes depending on the applied catalysts
The thermal stability of aqueous polyurethanes has been measured applying the thermogravimetric analysis. The aqueous polyurethanes (aqPUR) with catalysts of different selectivity have been studied by use of the dynamic method. To obtain degradations of 0.025, 0.05, and 0.10, employing the dynamic method, the heating rates of 0.5, 1, 2, 5, and 10 degrees C min(-1) have been used in the range of 30-500 degrees C. Using the more selective catalysts in the aqueous polyurethanes, the total resulting time of the decompositon has been on the increase at all degrees of the degradation and at the particular starting temperature. This paper shows that the dynamic method based on the thermogravimetric analysis can be used to assess the thermal stability of the aqueous polyurethanes using the catalysts of different selectivity
Detoxification of antimony by selenium and their interaction in paddy rice under hydroponic conditions
Isospin Structure of Penguins And Their Consequences in Physics
Isospin structure of gluon mediated or strong penguin is significantly
altered when the full electroweak corrections are included. This has the
consequence that some previous analyses which relied on a simple isospin
structure in charmless decays become inapplicable. We present the general
Hamiltonian in next-to-leading order QCD, and illustrate our conclusion
quantitatively for and decays in the
factorization approximation. Some remarks on CP asymmetries in decays are
also made.Comment: Revtex, 11 pages, typos in eq.(17) were correcte
, and the angle in the Presence of New Operators
We present formulae for the mass differences and in
the \BBds systems and for the CP violation parameter which are valid
in minimal flavour violation models giving rise to new four-fermion operators. Short distance contributions to , and
are parameterized by three {\it real} functions ,
and , respectively ( holds only if the Standard Model
operators dominate). We present simple strategies involving the ratio , and that allow to search for the effects
of the new operators. We point out that their sizable contributions to the
ratio would in principle allow to be larger
than . Constraints on the functions imposed by the present
(and future) experimental data are also discussed. As an example we show that
for large and not too heavy, in
the MSSM with heavy sparticles can be substantially smaller than in the SM due
the charged Higgs box contributions and in particular due to the growing like
contribution of the double penguin diagrams involving neutral
Higgs boson exchanges. As a result the bounds on the function can be
violated which allows to exclude large mixing of stops. In this scenario the
range of following from and is identical
to the SM ones (). On the other hand following
from is lower.Comment: 39 pages, 13 figures, uses axodraw.sty. V2: new BaBar and Belle
results on \sin2\beta incorporated; some explanations of the details of
calculation of \tan^4\bar\beta terms adde
Standard Model Confronting New Results for epsilon'/epsilon
We analyze the CP violating ratio \epe=epsilon'/epsilon in the Standard Model
in view of the new KTeV results. We review the present status of the most
important non-perturbative parameters B_6, B_8, B_K and of the strange quark
mass m_s. We also briefly discuss the issues of final state interactions and
renormalization scheme dependence. Updating the values of the CKM parameters,
of m_t and Lambda (MSbar) and using Gaussian errors for the experimental input
and flat distributions for the theoretical parameters we find \epe
substantially below the NA31 and KTeV data: \epe= (7.7^{+6.0}_{-3.5}) 10^{-4}
and \epe= (5.2^{+4.6}_{-2.7}) 10^{-4} in the NDR and HV renormalization schemes
respectively. A simple scanning of all input parameters gives on the other hand
1.05 10^{-4} < \epe < 28.8 10^{-4} and 0.26 10^{-4} < \epe < 22.0 10^{-4}
respectively. Analyzing the dependence on various parameters we find that only
for extreme values of B_6, B_8 and m_s and suitable values of CKM parameters
and Lambda(MSbar), the ratio \epe can be made consistent with data. We analyze
the impact of these data on the lower bounds for Im(V_{td}V_{ts}^*), Br(K_L to
pi^0 nu barnu), Br(K_L to pi^0e^+e^-)_{dir} and on tan(beta) in the Two Higgs
Doublet Model II.Comment: main latex-file, 4 figures and related latex files, 47 page
Establishing broad generality of DNA catalysts for site-specific hydrolysis of single-stranded DNA
We recently reported that a DNA catalyst (deoxyribozyme) can site-specifically hydrolyze DNA on the minutes time scale. Sequence specificity is provided by Watson-Crick base pairing between the DNA substrate and two oligonucleotide binding arms that flank the 40-nt catalytic region of the deoxyribozyme. The DNA catalyst from our recent in vitro selection effort, 10MD5, can cleave a single-stranded DNA substrate sequence with the aid of Zn2+ and Mn2+ cofactors, as long as the substrate cleavage site encompasses the four particular nucleotides ATG^T. Thus, 10MD5 can cleave only 1 out of every 256 (44) arbitrarily chosen DNA sites, which is rather poor substrate sequence tolerance. In this study, we demonstrated substantially broader generality of deoxyribozymes for site-specific DNA hydrolysis. New selection experiments were performed, revealing the optimality of presenting only one or two unpaired DNA substrate nucleotides to the N40 DNA catalytic region. Comprehensive selections were then performed, including in some cases a key selection pressure to cleave the substrate at a predetermined site. These efforts led to identification of numerous new DNA-hydrolyzing deoxyribozymes, many of which require merely two particular nucleotide identities at the cleavage site (e.g. T^G), while retaining Watson-Crick sequence generality beyond those nucleotides along with useful cleavage rates. These findings establish experimentally that broadly sequence-tolerant and site-specific deoxyribozymes are readily identified for hydrolysis of single-stranded DNA
- …