164,576 research outputs found
Joshua Davis: Author of Spare Parts
No full textCitation: K-State First (2016). Joshua Davis: Author of Spare Parts [Flier]. Manhattan, Kansas: K-State First.Flyer advertising Joshua Davis's author talk at Kansas State University
Steven Johnson Author Talk Poster
No full textK-State Book NetworkA poster advertising an author talk by Steven Johnson at Kansas State University on September 3, 2014. Steven Johnson's book "The Ghost Map" was the 2014-2015 common book
Price impact of block trades in the Saudi stock market
No full textThis paper examines the price impact of block trades for the 124 companies that comprise all listed firms in the Saudi stock market (SSM). We use high frequency intraday data (one minute intervals) for the period 2005-2008 to provide out of sample evidence of the determinants of price impact. We find an asymmetric price impact of 0.5% for block purchases and -0.38% for block sales. We document a price continuation post block trades and a price reversal after block sales. Sellers of block trades in the Saudi market pay higher liquidity premiums than
buyers of block trades. However, on average, the price effect of a block trade is small and short-lived suggesting that resiliency is high in the market. Moreover, we find a direct relationship between the size of the trades and the level of information asymmetry in the market. Despite the structural differences of the SSM, the intraday pattern of price impacts is similar to patterns documented in other markets, namely an inverse J-shaped pattern. Finally,
sophisticated traders can gain abnormal profits in the SSM through “free riding”, a trader can benefit from the overreaction before the block trade and price reversal after the block trade
Chapter 6: Peracetic Acid Disinfection Byproducts and Treatment of Contaminants of Concern
No full textPrice Impact of Block Trades and Price Behavior Surrounding Block Trades in Indian Capital Market
No full textWe analyze the permanent (information effect) and temporary (liquidity effect) impact of block trades transacted in the National Stock Exchange of India. Block trades are identified using multiple criteria based on trade value and trade volume. Overall, the permanent price impact is more for block purchases than for block sales indicating that block purchases are more informative than block sales, which may be motivated by liquidity need. Unlike in other markets, we observe that the temporary impact is greater than the permanent impact in case of block purchase. We classify the block trades as All-or-None (AON) and Not-AON trades depending on the number of transactions through which a block order is executed. As expected, the price impact is higher for Not-AON trades as compared to AON trades (which can be assumed to be pre-negotiated trades). Further, arrival of multiple block trades increases market confidence on the information. The permanent price impact is higher for days where there are more than one block trade of similar nature than for days with only one block trade. To analyze the speed of market response to the information associated with block trades, we have used the ‘transaction time event approach’, as used by Holthausen et al. (1990). We find that the prices start increasing (front running) 8 minutes before block purchases but not in case of block sales i.e. some information about the impending block purchase is factored in by the market when the block trade is for purchases. Further, in the case of block sales, prices revert quickly leaving very small permanent price impact.
Teaching in the block: perceptions from an agricultural education classroom
No full textPlan BA relatively new initiative called block scheduling is being used in high schools all over the country. Several schools are investigating and adopting block schedules to replace traditional schedules. Block scheduling has several benefits to educators, for example, the larger blocks of class time allow for a variety of teaching methods and activities. The purpose of the study was to research the teachers' attitudes of the effectiveness of block scheduling design. The study focused on four questions (1) What are agricultural education teachers' perceptions of the overall effectiveness of block scheduling? (2) Have teaching methods in agricultural education changed in response to block scheduling? (3) Has enrollment in agriculture classes changed as a result of the block schedule? (4) What are important benefits and drawbacks of block scheduling specific to agricultural education classrooms? Surveys were distributed to Wisconsin Agricultural Education Instructors at the end of the 2002 school year. The survey consisted of demographic information, 30 Likert type items, and a comment section. A total of 48 surveys were mailed to participants and thirty-two (67%) were returned. Results show that many teachers feel overall that block scheduling is effective for their agricultural education programs. Many participants stated advantages to block scheduling such as hands-on and lab activities, more time for fieldtrips, and the opportunity to have more individualized contact with students. However, participants also mentioned disadvantages such as challenges with FFA recruitment and member involvement
On automorphism groups of block designs
No full textAbstractThis paper studies the relationship between the point orbits and block orbits for groups on automorphisms of balanced incomplete block designs. For a prime p and a group on a design with parameters v, b, r, k, λ, with t point orbits, of lengths v1, …, vt, and t′ block orbits, of lengths b1, …, bt′, the following main result is proved: ifp∤(r−λ)(r,b)(k,v)(resp.p∤r−λ)then there are t block orbits, of lengths bj1, …, bjt such that vi and bji are divisible by exactly the same powers of p for i=1, …, t (resp. of at least t−1 of the t indices i). A similar result is proved for constant-distance matrices (in particular for Hadamard matrices). Applications are given to permutation groups on a finite set Ω (about the orbits of k-element subsets of Ω) and to designs of configurations in other designs (e.g., about the flag orbits in a finite projective plane)
Can market frictions really explain the price impact asymmetry of block trades? Evidence from the Saudi stock market
No full textWe empirically examine the price impact of block trades, in the Saudi Stock Market over
the time period of 2005-2008. Using a unique dataset of intraday data consisting of 2.3
million block buys and 1.9 million block sales, we find an asymmetry in the price impact of block purchases and sales. The asymmetry persists even when we account for the bidask bias in block trades, which is contrary to the previous literature. Overall, our findings suggest that in an emerging market where institutional trading is relatively scarce, market microstructure cannot explain the asymmetry n the price impact of large trades
The relationship between apamin binding and channel block in KCa2 potassium channels.
No full textSmall conductance calcium-activated potassium channels (KCa2.1,2.2,2.3) are widely distributed throughout the body and are involved in diverse physiological processes including the regulation of neuronal firing and smooth muscle contraction. They are also potential targets in the treatment of cardiac arrhythmia. The KCa2.2 and 2.3 members of the family are blocked by the peptide toxin apamin at low concentrations, however, the mechanism of block by apamin is unclear. In electrophysiological experiments apamin has been reported to block Kca2.2 and 2.3 with IC50 ~100 pM and ~1nM respectively. In contrast, in ligand binding experiments using [125I]-mono-iodoapamin it has been found that apamin does not discriminate between Kca2.2 and 2.3 and that it binds with significantly higher affinity ( ~5pM). This discrepancy has led to the suggestion that, rather than acting as a classical pore blocker, apamin exerts its action by an allosteric mechanism. It is notable that the ligand binding studies reported so far have been conducted with isolated cell membranes in non-physiological solution with low ionic strength. We have investigated this discrepancy between results from ligand binding and electrophysiological studies by comparing binding of [125I]-mono-iodoapamin and inhibition of KCa2 current in intact HEK 293 cells using identical physiological solutions. In these conditions we found that apamin bound to KCa2.1 and KCa 2.3 with KL 60 and 606 pM, close to values of IC50 from electrophysiological experiments. We also compared the ability of some known SK channel blockers, UCL 1848, UCL 1684, gallamine and dequalinium, to displace labelled apamin and inhibit KCa2 current. With these compounds we found a good correlation between K¬i and IC50. These findings suggest that the discrepancy between binding and block might arise from differences in the experimental protocols used. To examine this we examined apamin block of KCa2 current in low ionic strength solutions in which NaCl was iso-osmotically replaced by sucrose. In these conditions 100 pM apamin caused 92 ± 0.1 % block as against 51 ± 5 % block in physiological ionic strength. We conclude that binding data obtained from membrane preparations must be interpreted with care when making comparisons with data from functional experiments and that this has implications for current views on the mechanism of action of apamin as an SK channel blocke
Suppression of MRI Truncation Artifacts Using Total Variation Constrained Data Extrapolation
No full textThe finite sampling of k-space in MRI causes spurious image artifacts, known as Gibbs ringing, which result from signal truncation at the border of k-space. The effect is especially visible for acquisitions at low resolution and commonly reduced by filtering at the expense of image blurring. The present work demonstrates that the simple assumption of a piecewise-constant object can be exploited to extrapolate the data in k-space beyond the measured part. The method allows for a significant reduction of truncation artifacts without compromising resolution. The assumption translates into a total variation minimization problem, which can be solved with a nonlinear optimization algorithm. In the presence of substantial noise, a modified approach offers edge-preserving denoising by allowing for slight deviations from the measured data in addition to supplementing data. The effectiveness of these methods is demonstrated with simulations as well as experimental data for a phantom and human brain in vivo
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