Proceedings of The XXVIII International Symposium on Lattice Field Theory — PoS(Lattice 2010), 2011
We use the background field method to extract the polarizability for the neutral "pion". In our p... more We use the background field method to extract the polarizability for the neutral "pion". In our previous study we found that the polarizability for this system is negative which is believed to be a finite volume artifact. To address this issue, we carry out simulations for different lattice sizes and we also look at the influence of the boundary conditions on these results. We find that for pion masses lower than 400 MeV the polarizability remains negative even on larger lattices. An infinite volume extrapolation is attempted, but the results are not conclusive due mainly to a lack of an analytical form for the finite volume corrections for this system.
A comprehensive study is made for the magnetic moments of octet baryons in the method of QCD sum ... more A comprehensive study is made for the magnetic moments of octet baryons in the method of QCD sum rules. A complete set of QCD sum rules is derived using the external field method and generalized interpolating fields. For each member, three sum rules are constructed from three independent tensor structures. They are analyzed in conjunction with the corresponding mass sum rules. The performance of each of the sum rules is examined using the criteria of OPE convergence and ground-state dominance, along with the role of the transitions in intermediate states. Individual contributions from the u, d and s quarks are isolated and their implications in the underlying dynamics are explored. Valid sum rules are identified and their predictions are obtained. The results are compared with experiment and previous calculations.
Petroleum oil spill happens occasionally at sea. It's important to differentiate the exact pr... more Petroleum oil spill happens occasionally at sea. It's important to differentiate the exact products in order to carry out following actions to decrease harmfulness. In the present study, a rapid oil spill identification method by near infrared spectroscopy coupled with pattern recognition techniques is proposed. 56 simulated spilled oils of gasoline, diesel fuel and lubricating oil in marine were chosen to develop the method. Organic reagent of CCl4 was used to extract the oil. Pattern recognition techniques were established by principal component analysis (PCA) coupled with Mahalanobis' distance with the multiplicative signal correction (MSC) and Norris first derivative pretreatment. The study shows that PCA technique is a useful method to extract the main characteristics, and Mahalanobis' distance is an ellipsoidal boundary that circumscribes a data cluster. And oil spill samples with concentration above 0.4 microL x mL(-1) can be successfully identified by the method....
We study the quenched chiral behavior of hadrons with the pseudoscalar mass as low as ≈ 280 MeV. ... more We study the quenched chiral behavior of hadrons with the pseudoscalar mass as low as ≈ 280 MeV. We look for quenched chiral logs in the pion mass, determine the renormalized quark mass, and observe quenched artifacts in the a0 and N * propagators. The calculation is done on a quenched lattice of size 20 4 and a = 0.148(2) fm using overlap fermions and an improved gauge action.
It is popular to probe the structure of the QCD vacuum indirectly by studying individual fermion ... more It is popular to probe the structure of the QCD vacuum indirectly by studying individual fermion eigenmodes, because this provides a natural way to filter out UV fluctuations. The double-peaking in the distribution of the local chiral orientation parameter (X) has been offered as evidence, by some, in support of a particular model of the vacuum. Here we caution that the X-distribution peaking varies significantly with various versions of the definition of X. Furthermore, each distribution varies little from that resulting from a random reshuffling of the left-handed (and independently the right-handed) fields, which destroys any QCD-induced left-right correlation; that is, the double-peaking is mostly a phase-space effect. We propose a new universal definition of the X parameter whose distribution is uniform for randomly reshuffled fields. Any deviations from uniformity for actual data can then be directly attributable to QCD-induced dynamics. We find that the familiar double peak disappears.
I present results for the mass spectrum of excited baryons and pentaquarks using overlap fermions... more I present results for the mass spectrum of excited baryons and pentaquarks using overlap fermions and Bayesian curve-fitting method; and magnetic moments and polarizabilities for a variety of hadrons in the background field method.
Investigations of the quasifree reaction A(γ, KY)B are presented in the distorted wave impulse ap... more Investigations of the quasifree reaction A(γ, KY)B are presented in the distorted wave impulse approximation (DWIA). For this purpose, we present a revised tree-level model of elementary kaon photoproduction that incorporates hadronic form factors consistent with gauge invariance, uses SU(3) values for the Born couplings and uses resonances consistent with multichannel analyses. The potential of exclusive quasifree kaon photoproduction on nuclei to reveal details of the hyperonnucleus interaction is examined. Detailed predictions for the coincidence cross section, the photon asymmetry, and the hyperon polarization and their sensitivities to the ingredients of the model are obtained for all six production channels. Under selected kinematics these observables are found to be sensitive to the hyperon-nucleus final-state interaction. Some polarization observables are found to be insensitive to distortion effects, making them ideal tools to search for possible medium modifications of the elementary amplitude.
IEEE Transactions on Semiconductor Manufacturing, 2008
This paper presents a new and improved solution for random yield improvement at the post-routing ... more This paper presents a new and improved solution for random yield improvement at the post-routing stage. The proposed solution is better suited for current processes, where a clustering effect has been observed resulting in differing particle densities in the metal and empty regions of the chip. To account for this clustering effect, we introduce the concept of weighted critical area to serve as a proxy for random yield loss. A new algorithm for weighted critical area minimization is also introduced. The proposed optimization solution derives a weighted critical area based on the user-specified particle densities. It then uses this weighted critical area information to dynamically select the appropriate critical area reduction technique in each local region to guarantee a reduction of the weighted critical area in both the local region and the whole layer. This makes the algorithm flexible and readily applicable to different process lines. It consistently improves the random yield irrespective of the particle densities in the metal and empty regions of the chip.
An approach based on homology probing was used to clone a partial cDNA encoding a novel melatonin... more An approach based on homology probing was used to clone a partial cDNA encoding a novel melatonin (ML) receptor (MLR) from chicken (Gallus domestlcus) brain. Based on available deduced amino-acid sequence, the chicken MLR (cMLR) displayed greater sequence homology to the frog (Xcnopus) MLR than cloned human/mammalian receptors, with overall identities of 73% and 66%, respectively. In order to gain functional expression, a chimeric frog/chicken (flc)MLR was constructed in which the 5' end of the cMLR, including the N-terminus, TMI and part of the first intracellular loop was substituted by fMLR sequence. [12Sl]lodo-ML bound with high affinity (Ko of ~35 pM) to COS-7 cells transiently expressing the flcMLR in a saturable and guanine nucleotide-sensitive manner with the following rank order of potency: 2-iodo-ML
The AtT-20 cell line, derived from the mouse anterior pituitary, synthesizes an adrenocorticotrop... more The AtT-20 cell line, derived from the mouse anterior pituitary, synthesizes an adrenocorticotropic hormone (ACTH) precursor, proteolytically processes it to mature ACTH, stores it in secretory granules, and releases mature ACTH on stimulation with a secretagogue. A cDNA for human proinsulin inserted downstream from the SV40 early promoter in an SV40-pBR322 recombinant vector was introduced into AtT-20 cells. The stably transformed cell line, AtT-POins4b/l, stores immunoreactive insulin, proteolytically processes proinsulin to smaller fragments, and on stimulation with secretagogues releases insulin-like material, not proinsulin, into the medium. Similarly transformed fibroblast L-cells secrete only proinsulin; they do not store it, and their secretion rate is unaffected by secretagogues. The transport mechanism for precursor ACTH thus appears to recognize other prohormones.
Proceedings of The XXVIII International Symposium on Lattice Field Theory — PoS(Lattice 2010), 2011
We use the background field method to extract the polarizability for the neutral "pion". In our p... more We use the background field method to extract the polarizability for the neutral "pion". In our previous study we found that the polarizability for this system is negative which is believed to be a finite volume artifact. To address this issue, we carry out simulations for different lattice sizes and we also look at the influence of the boundary conditions on these results. We find that for pion masses lower than 400 MeV the polarizability remains negative even on larger lattices. An infinite volume extrapolation is attempted, but the results are not conclusive due mainly to a lack of an analytical form for the finite volume corrections for this system.
A comprehensive study is made for the magnetic moments of octet baryons in the method of QCD sum ... more A comprehensive study is made for the magnetic moments of octet baryons in the method of QCD sum rules. A complete set of QCD sum rules is derived using the external field method and generalized interpolating fields. For each member, three sum rules are constructed from three independent tensor structures. They are analyzed in conjunction with the corresponding mass sum rules. The performance of each of the sum rules is examined using the criteria of OPE convergence and ground-state dominance, along with the role of the transitions in intermediate states. Individual contributions from the u, d and s quarks are isolated and their implications in the underlying dynamics are explored. Valid sum rules are identified and their predictions are obtained. The results are compared with experiment and previous calculations.
Petroleum oil spill happens occasionally at sea. It's important to differentiate the exact pr... more Petroleum oil spill happens occasionally at sea. It's important to differentiate the exact products in order to carry out following actions to decrease harmfulness. In the present study, a rapid oil spill identification method by near infrared spectroscopy coupled with pattern recognition techniques is proposed. 56 simulated spilled oils of gasoline, diesel fuel and lubricating oil in marine were chosen to develop the method. Organic reagent of CCl4 was used to extract the oil. Pattern recognition techniques were established by principal component analysis (PCA) coupled with Mahalanobis' distance with the multiplicative signal correction (MSC) and Norris first derivative pretreatment. The study shows that PCA technique is a useful method to extract the main characteristics, and Mahalanobis' distance is an ellipsoidal boundary that circumscribes a data cluster. And oil spill samples with concentration above 0.4 microL x mL(-1) can be successfully identified by the method....
We study the quenched chiral behavior of hadrons with the pseudoscalar mass as low as ≈ 280 MeV. ... more We study the quenched chiral behavior of hadrons with the pseudoscalar mass as low as ≈ 280 MeV. We look for quenched chiral logs in the pion mass, determine the renormalized quark mass, and observe quenched artifacts in the a0 and N * propagators. The calculation is done on a quenched lattice of size 20 4 and a = 0.148(2) fm using overlap fermions and an improved gauge action.
It is popular to probe the structure of the QCD vacuum indirectly by studying individual fermion ... more It is popular to probe the structure of the QCD vacuum indirectly by studying individual fermion eigenmodes, because this provides a natural way to filter out UV fluctuations. The double-peaking in the distribution of the local chiral orientation parameter (X) has been offered as evidence, by some, in support of a particular model of the vacuum. Here we caution that the X-distribution peaking varies significantly with various versions of the definition of X. Furthermore, each distribution varies little from that resulting from a random reshuffling of the left-handed (and independently the right-handed) fields, which destroys any QCD-induced left-right correlation; that is, the double-peaking is mostly a phase-space effect. We propose a new universal definition of the X parameter whose distribution is uniform for randomly reshuffled fields. Any deviations from uniformity for actual data can then be directly attributable to QCD-induced dynamics. We find that the familiar double peak disappears.
I present results for the mass spectrum of excited baryons and pentaquarks using overlap fermions... more I present results for the mass spectrum of excited baryons and pentaquarks using overlap fermions and Bayesian curve-fitting method; and magnetic moments and polarizabilities for a variety of hadrons in the background field method.
Investigations of the quasifree reaction A(γ, KY)B are presented in the distorted wave impulse ap... more Investigations of the quasifree reaction A(γ, KY)B are presented in the distorted wave impulse approximation (DWIA). For this purpose, we present a revised tree-level model of elementary kaon photoproduction that incorporates hadronic form factors consistent with gauge invariance, uses SU(3) values for the Born couplings and uses resonances consistent with multichannel analyses. The potential of exclusive quasifree kaon photoproduction on nuclei to reveal details of the hyperonnucleus interaction is examined. Detailed predictions for the coincidence cross section, the photon asymmetry, and the hyperon polarization and their sensitivities to the ingredients of the model are obtained for all six production channels. Under selected kinematics these observables are found to be sensitive to the hyperon-nucleus final-state interaction. Some polarization observables are found to be insensitive to distortion effects, making them ideal tools to search for possible medium modifications of the elementary amplitude.
IEEE Transactions on Semiconductor Manufacturing, 2008
This paper presents a new and improved solution for random yield improvement at the post-routing ... more This paper presents a new and improved solution for random yield improvement at the post-routing stage. The proposed solution is better suited for current processes, where a clustering effect has been observed resulting in differing particle densities in the metal and empty regions of the chip. To account for this clustering effect, we introduce the concept of weighted critical area to serve as a proxy for random yield loss. A new algorithm for weighted critical area minimization is also introduced. The proposed optimization solution derives a weighted critical area based on the user-specified particle densities. It then uses this weighted critical area information to dynamically select the appropriate critical area reduction technique in each local region to guarantee a reduction of the weighted critical area in both the local region and the whole layer. This makes the algorithm flexible and readily applicable to different process lines. It consistently improves the random yield irrespective of the particle densities in the metal and empty regions of the chip.
An approach based on homology probing was used to clone a partial cDNA encoding a novel melatonin... more An approach based on homology probing was used to clone a partial cDNA encoding a novel melatonin (ML) receptor (MLR) from chicken (Gallus domestlcus) brain. Based on available deduced amino-acid sequence, the chicken MLR (cMLR) displayed greater sequence homology to the frog (Xcnopus) MLR than cloned human/mammalian receptors, with overall identities of 73% and 66%, respectively. In order to gain functional expression, a chimeric frog/chicken (flc)MLR was constructed in which the 5' end of the cMLR, including the N-terminus, TMI and part of the first intracellular loop was substituted by fMLR sequence. [12Sl]lodo-ML bound with high affinity (Ko of ~35 pM) to COS-7 cells transiently expressing the flcMLR in a saturable and guanine nucleotide-sensitive manner with the following rank order of potency: 2-iodo-ML
The AtT-20 cell line, derived from the mouse anterior pituitary, synthesizes an adrenocorticotrop... more The AtT-20 cell line, derived from the mouse anterior pituitary, synthesizes an adrenocorticotropic hormone (ACTH) precursor, proteolytically processes it to mature ACTH, stores it in secretory granules, and releases mature ACTH on stimulation with a secretagogue. A cDNA for human proinsulin inserted downstream from the SV40 early promoter in an SV40-pBR322 recombinant vector was introduced into AtT-20 cells. The stably transformed cell line, AtT-POins4b/l, stores immunoreactive insulin, proteolytically processes proinsulin to smaller fragments, and on stimulation with secretagogues releases insulin-like material, not proinsulin, into the medium. Similarly transformed fibroblast L-cells secrete only proinsulin; they do not store it, and their secretion rate is unaffected by secretagogues. The transport mechanism for precursor ACTH thus appears to recognize other prohormones.
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Papers by Frank Lee