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Effect of Braid Structure on Yarn Cross-Sectional Shape
Lyons, Jason,Pastore, Christopher M. The Korean Fiber Society 2004 Fibers and polymers Vol.5 No.3
The effect of braid construction parameters on yarn cross-sectional shape is presented in this paper. The location of the yam within the braid unit cell is quantified by a compaction factor. A range of braided fabrics were produced and optically measured for actual yarn cross-sectional shape. A comparison of the theoretical and experimental values shows good correlation. Design curves can be produced with the developed model to allow selection of appropriate braid process parameter to create yarns with desired cross-sectional geometries.
MULTISCALE MODELLING FOR THE FISSION GAS BEHAVIOUR IN THE TRANSURANUS CODE
P. VAN UFFELEN,G. PASTORE,V. DI MARCELLO,L. LUZZI 한국원자력학회 2011 Nuclear Engineering and Technology Vol.43 No.6
A formulation is proposed for modelling the process of intra-granular diffusion of fission gas during irradiation of UO2under both normal operating conditions and power transients. The concept represents a simple extension of the formulation of Speight, including an estimation of the contribution of bubble motion to fission gas diffusion. The resulting equation is formally identical to the diffusion equation adopted in most models that are based on the formulation of Speight, therefore retaining the advantages in terms of simplicity of the mathematical-numerical treatment and allowing application in integral fuel performance codes. The development of the new model proposed here relies on results obtained by means of molecular dynamics simulations as well as finite element computations. The formulation is proposed for incorporation in the TRANSURANUS fuel performance code.
Compute–Forward Multiple Access (CFMA): Practical Implementations
Sula, Erixhen,Zhu, Jingge,Pastore, Adriano,Lim, Sung Hoon,Gastpar, Michael Institute of Electrical and Electronics Engineers 2019 IEEE transactions on communications Vol.67 No.2
<P>We present a practical strategy that aims to attain rate points on the dominant face of the multiple access channel capacity using a standard low complexity decoder. This technique is built upon recent theoretical developments of Zhu and Gastpar on compute–forward multiple access which achieves the capacity of the multiple access channel using a sequential decoder. We illustrate this strategy with off-the-shelf LDPC codes. In the first stage of decoding, the receiver first recovers a linear combination of the transmitted codewords using the sum-product algorithm (SPA). In the second stage, by using the recovered sum-of-codewords as side information, the receiver recovers one of the two codewords using a modified SPA, ultimately recovering both codewords. The main benefit of recovering the sum-of-codewords instead of the codeword itself is that it allows to attain points on the dominant face of the multiple access channel capacity without the need of rate-splitting or time sharing while maintaining a low complexity in the order of a standard point-to-point decoder. This property is also shown to be crucial for some applications, e.g., interference channels. For all the simulations with single-layer binary codes, our proposed practical strategy is shown to be within 1.7 dB of the theoretical limits, without explicit optimization on the off-the-self LDPC codes.</P>
Mario Soccio,Donato Pastore,Daniela Trono,Maura N. Laus 한국응용생명화학회 2013 Applied Biological Chemistry (Appl Biol Chem) Vol.56 No.4
An improved spectrophotometric assay of phospholipase A2 (PLA2) activity based on the coupled PLA2/lipoxygenase (LOX) reactions using 1-palmitoyl-2-linoleoyl-sn-glycero-3-phosphatidylcholine (PCLIN) as substrate is reported. The PLA2-mediated release of free linoleate is continuously monitored by following the absorbance increase at 234 nm caused by its conversion into the conjugated diene hydroperoxide catalyzed by the coupled soybean LOX-1 reaction. The new protocol includes the use of Tween 20 (3 μL/μmol phospholipid) as surfactant and of ethanol (15 μL/mL reaction mixture), that ensure clearness of reaction mixture and linear increase of absorbance in the course of reaction. This method was tested on a purified secretory PLA2from honey bee venom (HBV-PLA2). The enzyme did not discriminate among PCLIN, phosphatidylcholine, and phosphatidylethanolamine,but showed the highest rate using 1,2-dilinoleoyl-sn-glycero-3-phosphatidylcholine (PCDILIN). Nevertheless,the use of PCDILIN is not recommended, as it may induce an overestimation of enzyme activity, because not only the free linoleate, but also the reaction product 1-linoleoyl-lysophosphatidylcholine,are known to be oxidized by LOX. HBV-PLA2showed maximal activity at pH 9.0, hyperbolic kinetics (Km,74.2±2.9 μM; Vmax, 827±7 μmol/min/mg protein) and competitive inhibition (Ki about 5 μM) by palmityl trifluoromethyl ketone, a classical PLA2 inhibitor. Interestingly, the HBV-PLA2/soybean LOX-1 coupled reactions also allow an accurate assay of PCLIN concentration. In the whole, these results demonstrate that this improved PLA2/LOX assay allows a very accurate, simple, and rapid measurement of enzyme activity and substrate concentration.
MULTISCALE MODELLING FOR THE FISSION GAS BEHAVIOUR IN THE TRANSURANUS CODE
Van Uffelen, P.,Pastore, G.,Di Marcello, V.,Luzzi, L. Korean Nuclear Society 2011 Nuclear Engineering and Technology Vol.43 No.6
A formulation is proposed for modelling the process of intra-granular diffusion of fission gas during irradiation of $UO_2$ under both normal operating conditions and power transients. The concept represents a simple extension of the formulation of Speight, including an estimation of the contribution of bubble motion to fission gas diffusion. The resulting equation is formally identical to the diffusion equation adopted in most models that are based on the formulation of Speight, therefore retaining the advantages in terms of simplicity of the mathematical-numerical treatment and allowing application in integral fuel performance codes. The development of the new model proposed here relies on results obtained by means of molecular dynamics simulations as well as finite element computations. The formulation is proposed for incorporation in the TRANSURANUS fuel performance code.
A Joint Typicality Approach to Compute–Forward
Lim, Sung Hoon,Feng, Chen,Pastore, Adriano,Nazer, Bobak,Gastpar, Michael IEEE 2018 IEEE transactions on information theory Vol.64 No.12
<P>This paper presents a joint typicality framework for encoding and decoding nested linear codes in multi-user networks. This framework provides a new perspective on compute–forward within the context of discrete memoryless networks. In particular, it establishes an achievable rate region for computing a linear combination over a discrete memoryless multiple-access channel (MAC). When specialized to the Gaussian MAC, this rate region recovers and improves upon the lattice-based compute–forward rate region of Nazer and Gastpar, thus providing a unified approach for discrete memoryless and Gaussian networks. Furthermore, our framework provides some valuable insights on establishing the optimal decoding rate region for compute–forward by considering joint decoders, progressing beyond most previous works that consider successive cancellation decoding. Specifically, this paper establishes an achievable rate region for simultaneously decoding two linear combinations of nested linear codewords from <TEX>$K$</TEX> senders.</P>
Soccio, Mario,Trono, Daniela,Laus, Maura N.,Pastore, Donato 한국응용생명화학회 2013 Applied Biological Chemistry (Appl Biol Chem) Vol.56 No.4
An improved spectrophotometric assay of phospholipase $A_2$ ($PLA_2$) activity based on the coupled $PLA_2$/lipoxygenase (LOX) reactions using 1-palmitoyl-2-linoleoyl-sn-glycero-3-phosphatidylcholine ($PC_{LIN}$) as substrate is reported. The $PLA_2$-mediated release of free linoleate is continuously monitored by following the absorbance increase at 234 nm caused by its conversion into the conjugated diene hydroperoxide catalyzed by the coupled soybean LOX-1 reaction. The new protocol includes the use of Tween 20 ($3{\mu}L/{\mu}mol$ phospholipid) as surfactant and of ethanol ($15{\mu}L/mL$ reaction mixture), that ensure clearness of reaction mixture and linear increase of absorbance in the course of reaction. This method was tested on a purified secretory $PLA_2$ from honey bee venom (HBV-$PLA_2$). The enzyme did not discriminate among $PC_{LIN}$, phosphatidylcholine, and phosphatidylethanolamine, but showed the highest rate using 1,2-dilinoleoyl-sn-glycero-3-phosphatidylcholine ($PC_{DILIN}$). Nevertheless, the use of $PC_{DILIN}$ is not recommended, as it may induce an overestimation of enzyme activity, because not only the free linoleate, but also the reaction product 1-linoleoyl-lysophosphatidylcholine, are known to be oxidized by LOX. HBV-$PLA_2$ showed maximal activity at pH 9.0, hyperbolic kinetics ($K_m$, $74.2{\pm}2.9{\mu}M$; $V_{max}$, $827{\pm}7{\mu}mol/min/mg$ protein) and competitive inhibition ($K_i$ about $5{\mu}M$) by palmityl trifluoromethyl ketone, a classical $PLA_2$ inhibitor. Interestingly, the HBV-$PLA_2$/soybean LOX-1 coupled reactions also allow an accurate assay of $PC_{LIN}$ concentration. In the whole, these results demonstrate that this improved $PLA_2$/LOX assay allows a very accurate, simple, and rapid measurement of enzyme activity and substrate concentration.