Explaining the Drift Behavior of Caffeine and Glucosamine After Addition of Ethyl Lactate in the Buffer Gas of an Ion Mobility Spectrometer

Fernandez-Maestre, Roberto,Velasco, Andres Reyes,Hill, Herbert H. Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.4

Protonated caffeine ($CH^+$) and glucosamine ($GH^+$) overlapped in an analysis with ion mobility spectrometryquadrupole mass spectrometry. Ethyl lactate vapor (L) at different concentrations from 0 to 22 mmol $m^{-3}$ was added as a buffer gas modifier to separate these signals. The drift times of $CH^+$ and $GH^+$ increased with L concentration. The drift time increase was associated to clustering equilibria of $CH^+$ and $GH^+$ with one molecule of L and the equilibrium of $GH^+$ was more displaced to the formation of $GLH^+$ than that of $GLH^+$. $GH^+$ clustered more to L than $CH^+$ because $GLH^+$ formed more stable hydrogen bonds (26.30 kcal/mol) than $GLH^+$ (24.66 kcal/mol) and the positive charge in $GH^+$ was more sterically accessible than in $CH^+$. The aim of this work was to use theoretical calculations to guide the selection of a buffer gas modifier for IMS separations of two compounds that overlap in the mobility spectra and predict this separation, simplifying that empirical process.

Explaining the Drift Behavior of Caffeine and Glucosamine After Addition of Ethyl Lactate in the Buffer Gas of an Ion Mobility Spectrometer

Roberto Fernandez-Maestre,Andres Reyes Velasco,Herbert H. Hill 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.4

Protonated caffeine (CH+) and glucosamine (GH+) overlapped in an analysis with ion mobility spectrometryquadrupole mass spectrometry. Ethyl lactate vapor (L) at different concentrations from 0 to 22 mmol m−3 was added as a buffer gas modifier to separate these signals. The drift times of CH+ and GH+ increased with L concentration. The drift time increase was associated to clustering equilibria of CH+ and GH+ with one molecule of L and the equilibrium of GH+ was more displaced to the formation of GLH+ than that of CLH+. GH+ clustered more to L than CH+ because GLH+ formed more stable hydrogen bonds (26.30 kcal/mol) than CLH+ (24.66 kcal/mol) and the positive charge in GH+ was more sterically accessible than in CH+. The aim of this work was to use theoretical calculations to guide the selection of a buffer gas modifier for IMS separations of two compounds that overlap in the mobility spectra and predict this separation, simplifying that empirical process.

A PageRank Based Coalitional Control Scheme

José María Maestre,Hideaki Ishii 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.5

We introduce a novel coalitional control scheme based on the PageRank, which is a measure of therelevance of the nodes in a graph. In particular, local controllers are allowed to create aid request/offer links toeach other. The PageRank of the aid network is then used as a means to group the agents dynamically in clustersin real time. Model predictive control is used inside each cluster to calculate the control actions taking into accountthe objectives of the corresponding controllers. The proposed algorithm can be implemented in a fully distributedfashion. Via a simulation example, we demonstrate that the proposed algorithm can outperform other coalitionalcontrol schemes.

A Probabilistic Approach for Testing Feedback Controllers with Application to Congestion Control

José M. Maestre,Teresa Alvarez,Teodoro Alamo,Anuar Salim del Río,Amalia Luque 제어·로봇·시스템학회 2012 International Journal of Control, Automation, and Vol.10 No.4

Prompted by an application in congestion control of computer networks, this paper presents a methodology to certify with a certain degree of confidence whether a given controller satisfies a pre-defined set of specifications. The methodology is applied to testing AQM controllers for efficiency in congestion control, by repeating detailed simulations under a variety of network configurations.

Smart home interoperability: the DomoEsi project approach

J. M. Maestre,E. F. Camacho 보안공학연구지원센터 2009 International Journal of Smart Home Vol.3 No.3

The home automation market is characterized by the great number of systems available to the end user. The recent bubble in the building industry made the situation even worse due to the birth of new proprietary systems. The success of the digital home concept depends on the ease of integration between home automation systems and other consumer electronic equipment pre-existing in the home. In this paper the interoperability issue is addressed and the approach followed in the project DomoEsi is presented.

MAXIMUM MODULI OF UNIMODULAR POLYNOMIALS

Defant, Andreas,Garcia, Domingo,Maestre, Manuel Korean Mathematical Society 2004 대한수학회지 Vol.41 No.1

Let $\Sigma_{$\mid$\alpha$\mid$=m}\;s_{\alpha}z^{\alpha},\;z\;{\in}\;{\mathbb{C}}^n$ be a unimodular m-homogeneous polynomial in n variables (i.e. $$\mid$s_{\alpha}$\mid$\;=\;1$ for all multi indices $\alpha$), and let $R\;{\subset}\;{\mathbb{C}}^n$ be a (bounded complete) Reinhardt domain. We give lower bounds for the maximum modules $sup_{z\;{\in}\;R\;$\mid$\Sigma_{$\mid$\alpha$\mid$=m}\;s_{\alpha}z^{\alpha}$\mid$$, and upper estimates for the average of these maximum moduli taken over all possible m-homogeneous Bernoulli polynomials (i.e. $s_{\alpha}\;=\;{\pm}1$ for all multi indices $\alpha$). Examples show that for a fixed degree m our estimates, for rather large classes of domains R, are asymptotically optimal in the dimension n.

Maximum moduli of unimodular polynomials

Andreas Defant,Domingo Garc{\'\i}a,Manuel Maestre 대한수학회 2004 대한수학회지 Vol.41 No.1

Let |α|=m sαzα, z ∈ Cn be a unimodular m-homogeneous polynomial in n variables (i.e. |sα| = 1 for all multi indices α), and let R ⊂ Cn be a (bounded complete) Reinhardt domain. We give lower bounds for the maximum modulus supz∈R ||α|=msαzα|, and upper estimates for the average of these maximum moduli taken over all possible m-homogeneous Bernoulli polynomials (i.e. sα = ±1 for all multi indices α). Examples show that for a fixed degree m our estimates, for rather large classes of domains R, are asymptotically optimal in the dimension n.

Banach spaces of general Dirichlet series

Choi, Yun Sung,Kim, Un Young,Maestre, Manuel Elsevier 2018 Journal of mathematical analysis and applications Vol.465 No.2

<P><B>Abstract</B></P> <P>We study when the spaces of general Dirichlet series bounded on a half plane are Banach spaces, and show that some of those classes are isometrically isomorphic between themselves. In a precise way, let { <SUB> λ n </SUB> } be a strictly increasing sequence of positive real numbers such that <SUB> lim n → ∞ </SUB> ⁡ <SUB> λ n </SUB> = ∞ . We denote by <SUB> H ∞ </SUB> ( <SUB> λ n </SUB> ) the complex normed space of all Dirichlet series D ( s ) = <SUB> ∑ n </SUB> <SUB> b n </SUB> λ n − s , which are convergent and bounded on the half plane [ Re s > 0 ] , endowed with the norm [FORMULA OMISSION] If (⁎) there exists q > 0 such that <SUB> inf n </SUB> ⁡ ( <SUP> <SUB> λ n + 1 </SUB> q </SUP> − λ n q ) > 0 , then <SUB> H ∞ </SUB> ( <SUB> λ n </SUB> ) is a Banach space. Further, if there exists a strictly increasing sequence { <SUB> r n </SUB> } of positive numbers such that the sequence { log ⁡ <SUB> r n </SUB> } is Q -linearly independent, <SUB> μ n </SUB> = <SUP> r α </SUP> for n = <SUP> p α </SUP> , and { <SUB> λ n </SUB> } is the increasing rearrangement of the sequence { <SUB> μ n </SUB> } , then <SUB> H ∞ </SUB> ( <SUB> λ n </SUB> ) is isometrically isomorphic to <SUB> H ∞ </SUB> ( <SUB> B <SUB> c 0 </SUB> </SUB> ) . With this condition (⁎) we explain more explicitly the optimal cases of the difference among the abscissas <SUB> σ c </SUB> , <SUB> σ b </SUB> , <SUB> σ u </SUB> and <SUB> σ a </SUB> .</P>

Waveguiding behavior of VLS-grown one-dimensional Ga-doped In2O3 nanostructures

Jesús Alberto Ramos Ramón,U. Pal,David Maestre,Ana Cremades 한국물리학회 2018 Current Applied Physics Vol.18 No.7

Highly crystalline undoped and Ga-doped indium oxide nanorods with square-shaped faceted morphology were fabricated through the vapor-liquid-solid process at moderate temperature. Effects of Ga incorporation on the growth rate, morphology, and crystallinity of the nanostructures were evaluated by scanning electron microscopy, transmission electron microscopy, and X-ray diffraction. Defect structure and waveguiding behavior of the 1-D In2O3 nanostructures have been studied using microRaman and micro photoluminescence spectroscopies. The appearance of several resonant modes superposed over the broad room temperature micro-photoluminescence spectra of the nanostructures demonstrates their waveguiding behaviors. While the pristine or undoped In2O3 nanostructures of 20–150 nm widths revealed Fabry-Pérot resonance modes, the Ga-incorporated nanostructures of 20–100 nm width revealed whispering gallery modes due to their smaller widths. The quality factor (Q) of the resonators was estimated to be about 20.86 and 188.79 for the pristine and Ga-incorporated nanostructures, respectively, indicating a huge enhancement due to Ga incorporation. The increment in the Q factor on Ga incorporation in In2O3 nanorods opens up the possibility of their utilization for the development of new optical transmitters and resonators, and fabrication of nanoscopic lasing devices.

TRE+: Extended Tree-Based Routing Ethernet

Juan A. Carral,Guillermo Ibáñez,Miguel A. Lopez-Carmona,Ivan Marsa-Maestre,Alberto García-Martínez 한국전자통신연구원 2010 ETRI Journal Vol.32 No.1

Tree-based routing Ethernet (TRE) is a recent Ethernet architecture that enables shortcut links to improve performance compared to spanning tree protocols. However, TRE can only use shortcuts that arrive directly at bridges located in the branch of the destination. TRE+ extends the topology knowledge of a bridge to 2 hops away, thus unveiling new shortcuts to the destination branch. Simulations show a major performance improvement of TRE+ compared to TRE, with results close to shortest paths in some topologies.