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Papers by Jose Rivas
![Research paper thumbnail of Enhanced Pressure Dependence of Magnetic Exchange inA2+[V2]O4Spinels Approaching the Itinerant Electron Limit](https://attachments.academia-assets.com/105174996/thumbnails/1.jpg)
](Physical Review Letters, 2007
We report a systematic enhancement of the pressure dependence of T N in A 2 V 2 O 4 spinels as th... more We report a systematic enhancement of the pressure dependence of T N in A 2 V 2 O 4 spinels as the V-V separation approaches the critical separation for a transition to itinerant-electron behavior. An intermediate phase between localized and itinerant-electron behavior is identified in ZnV 2 O 4 and MgV 2 O 4 exhibiting mobile holes as large polarons. Partial electronic delocalization, cooperative ordering of V-V pairs in ZnV 2 O 4 below T s T N and dT N =dP < 0, signals that lattice instabilities associated with the electronic crossover are a universal phenomenon.
Journal of Microbiology & Experimentation, 2019
Introduction: Urinary tract infections (UTI) are one of the most frequent infectious processes wo... more Introduction: Urinary tract infections (UTI) are one of the most frequent infectious processes worldwide. The estimated incidence of UTI in our country is currently unknown. The treatment will depend on the age, the sex, the isolated germ, among others. Fluoroquinolones have been considered as the ideal treatment in this infection. The most empirically used is ciprofloxacin; however, its resistance makes a marked decrease in the effectiveness of the treatment with this agent. Objective: To describe the microbial resistance to ciprofloxacin in UTI as first-line treatment. Methods: Descriptive, cross-sectional and retrospective study, through the review of clinical records of 217 patients, who had the diagnosis of UTI, with reported cultures, during the period January 2013 to December 2017. Results: 82 patients were included (37.76%). The main germs that reported resistance were Escherichia coli (54.23%), Pseudomonas aeruginosa (11.86%). The most frequent comorbidity was Diabetes Mellitus. And the bacterial resistance reported in this study is 79.66%. Discussion: Resistance to ciprofloxacin constitutes a serious public health problem due to its frequent use. E coli were the bacterium with the greatest resistance to this antibiotic, superior to the reviewed studies. The proportion of resistance exceeds that reported in other works. Conclusion: Resistance to ciprofloxacin in urinary tract infection caused by common uropathogens is increasing. The use of this antibiotic agent as empirical therapy for UTI should be reconsidered and efforts should be made to limit its use to clinical conditions that warrant it.
RSC Adv., 2015
Removal of hydrophobic ligand enables a convenient phase-transfer route to aqueous magnetic nanoc... more Removal of hydrophobic ligand enables a convenient phase-transfer route to aqueous magnetic nanocolloid that shows excellent protein immobilization capability.
Quercus, 2003
Información del artículo El mirlo acuático en la Comunidad Valenciana.
This work deals with design and building of an electronic module for the teaching of Frequency Ho... more This work deals with design and building of an electronic module for the teaching of Frequency Hoping Spread Spectrum. The general theory behind the technique is a second modulation of a data modulated carrier driven by a pseudo random code. The design began with a block diagram of both the transmitter and the receiver where all the relevant stages are
Computer Aided Systems Theory–EUROCAST 2005, 2005
This work presents a set of linguistic variables for modelling some geologic and morphological fe... more This work presents a set of linguistic variables for modelling some geologic and morphological features of a coal seam. Since self-advancing winning coal systems and their interactions with coal faces represent extremely complex situations where traditional mathematical models are unable to offer working solutions, we explore the viability of using Fuzzy-logic based techniques in order to obtain a good-enough model that allows technicians at mine to get a better understanding of the variables at play and to foresee ...
Physical Review Letters, 2007
We report a systematic enhancement of the pressure dependence of T N in A 2 V 2 O 4 spinels as th... more We report a systematic enhancement of the pressure dependence of T N in A 2 V 2 O 4 spinels as the V-V separation approaches the critical separation for a transition to itinerant-electron behavior. An intermediate phase between localized and itinerant-electron behavior is identified in ZnV 2 O 4 and MgV 2 O 4 exhibiting mobile holes as large polarons. Partial electronic delocalization, cooperative ordering of V-V pairs in ZnV 2 O 4 below T s T N and dT N =dP < 0, signals that lattice instabilities associated with the electronic crossover are a universal phenomenon.
Journal of Microbiology & Experimentation, 2019
Introduction: Urinary tract infections (UTI) are one of the most frequent infectious processes wo... more Introduction: Urinary tract infections (UTI) are one of the most frequent infectious processes worldwide. The estimated incidence of UTI in our country is currently unknown. The treatment will depend on the age, the sex, the isolated germ, among others. Fluoroquinolones have been considered as the ideal treatment in this infection. The most empirically used is ciprofloxacin; however, its resistance makes a marked decrease in the effectiveness of the treatment with this agent. Objective: To describe the microbial resistance to ciprofloxacin in UTI as first-line treatment. Methods: Descriptive, cross-sectional and retrospective study, through the review of clinical records of 217 patients, who had the diagnosis of UTI, with reported cultures, during the period January 2013 to December 2017. Results: 82 patients were included (37.76%). The main germs that reported resistance were Escherichia coli (54.23%), Pseudomonas aeruginosa (11.86%). The most frequent comorbidity was Diabetes Mellitus. And the bacterial resistance reported in this study is 79.66%. Discussion: Resistance to ciprofloxacin constitutes a serious public health problem due to its frequent use. E coli were the bacterium with the greatest resistance to this antibiotic, superior to the reviewed studies. The proportion of resistance exceeds that reported in other works. Conclusion: Resistance to ciprofloxacin in urinary tract infection caused by common uropathogens is increasing. The use of this antibiotic agent as empirical therapy for UTI should be reconsidered and efforts should be made to limit its use to clinical conditions that warrant it.
RSC Adv., 2015
Removal of hydrophobic ligand enables a convenient phase-transfer route to aqueous magnetic nanoc... more Removal of hydrophobic ligand enables a convenient phase-transfer route to aqueous magnetic nanocolloid that shows excellent protein immobilization capability.
Quercus, 2003
Información del artículo El mirlo acuático en la Comunidad Valenciana.
This work deals with design and building of an electronic module for the teaching of Frequency Ho... more This work deals with design and building of an electronic module for the teaching of Frequency Hoping Spread Spectrum. The general theory behind the technique is a second modulation of a data modulated carrier driven by a pseudo random code. The design began with a block diagram of both the transmitter and the receiver where all the relevant stages are
Computer Aided Systems Theory–EUROCAST 2005, 2005
This work presents a set of linguistic variables for modelling some geologic and morphological fe... more This work presents a set of linguistic variables for modelling some geologic and morphological features of a coal seam. Since self-advancing winning coal systems and their interactions with coal faces represent extremely complex situations where traditional mathematical models are unable to offer working solutions, we explore the viability of using Fuzzy-logic based techniques in order to obtain a good-enough model that allows technicians at mine to get a better understanding of the variables at play and to foresee ...