High Excitation Levels Research Articles

Detection and characterization of local nonlinearity in a clamped‐clamped beam with state space realization

AbstractThe state space representation of linear and nonlinear systems is widely used in the literature for system characterization, system identification, and model‐based control synthesis. In the case of systems with local nonlinearity, the realization of a state space model where the states are physically interpretable as a requirement has been a challenging task. This requirement becomes more emphasized, especially in the scope of industrial high‐precision systems. Consequently, the class of black‐box system identification approaches becomes less attractive. In the scope of this paper, we are interested in modeling systems with dominant local nonlinearity where employing linear models can only cover a limited range of system dynamics. More specifically, geometric nonlinearities which are present in the joints (bolted) of structural interfaces are analyzed. The main goal is to provide systematical modeling of such systems without using a sparse nonlinear representation. Such a low‐order nonlinear model can improve the simplicity of analyzing the nonlinear system and can be used for structural vibration and noise control. In order not to neglect the sophisticated linear modeling technique, the linear model is proposed to be extended by means of smooth nonlinear terms. The systematic approach contains the modeling of the linear counterpart followed by the localization and characterization steps in the well‐known three‐step paradigm. For the characterization step, this work relies on the acceleration surface method (ASM). The experimental setup under study, as a benchmark, is a set of two beams of different lengths and thicknesses connected by a screw that is excited by a mechanical shaker. The axes are oriented in the transverse direction of the beams, while the boundaries are realized as imperfect clamped‐clamped boundary conditions at two ends in the model. Consequently, by selecting the excitation amplitude, we can control the dominant dynamics at lower excitation amplitudes and invoke the local nonlinearity at higher amplitudes. For higher excitation levels using sine sweep signals, the phase space information of the shaker and accelerometer sensors is used to detect the local nonlinearities along the clamped‐clamped beam. The detected and characterized nonlinearities are incorporated into the linear system as a systematic approach for modeling such a structurally nonlinear system.

The parameter-free Monte Carlo approach for diffractive dissociation of relativistic oxygen nuclei into four alpha particles in interactions with protons at 3.25GeV/c per nucleon

In this paper, we have investigated the processes of formation of four alpha particles in the final state in the reactions [Formula: see text] of diffractive dissociation of oxygen-16 nuclei in interactions with protons at an incident momentum of 3.25[Formula: see text]GeV/[Formula: see text] per nucleon. A Monte Carlo model is proposed to describe the kinematic characteristics of the produced alpha particles. The proposed Monte Carlo model does not have any free parameters. The algorithm of the model takes into account the energetically allowed channels of direct (or cascade) decays of the excited oxygen-16 nuclei into the final four alpha particles. To form the masses of the excited oxygen-16, carbon-12, and beryllium-8 nuclei, the experimental tables of their excitation levels have been used. All decays have been generated isotropically in the rest frame of each unstable nucleus — the excited oxygen-16, carbon-12, and beryllium-8 nuclei. The results of the Monte Carlo model calculations have proved to be in good agreement with distributions of various kinematic characteristics of the final state alpha particles taken from the experiment. The good agreement is reached if, after simulation of the mass of the excited oxygen-16, the energetically allowed decay channel is selected for which the sum of the total energy, released in this channel, and the masses of the four secondary alpha particles turn out to be less, but closest to the mass of the excited oxygen-16 nucleus. At a high level of excitation, there are several channels with the same energy release, which have been generated with equal probabilities.

Offenders and non-offenders with schizophrenia spectrum disorders: the crime-preventive potential of sufficient embedment in the mental healthcare and support system.

Suffering from schizophrenia spectrum disorder (SSD) has been well-established as a risk factor for offending. However, the majority of patients with an SSD do not show aggressive or criminal behavior. Yet, there is little research on clinical key features distinguishing offender from non-offender patients. Previous results point to poorer impulse control, higher levels of excitement, tension, and hostility, and worse overall cognitive functioning in offender populations. This study aimed to detect the most indicative distinguishing clinical features between forensic and general psychiatric patients with SSD based on the course of illness and the referenced hospitalization in order to facilitate a better understanding of the relationship between violent and non-violent offenses and SSD. Our study population consisted of forensic psychiatric patients (FPPs) with a diagnosis of F2x (ICD-10) or 295.x (ICD-9) and a control group of general psychiatric patients (GPPs) with the same diagnosis, totaling 740 patients. Patients were evaluated regarding their medical (and, if applicable, criminal) history and the referenced psychiatric hospitalization. Supervised machine learning (ML) was used to exploratively evaluate predictor variables and their interplay and rank them in accordance with their discriminative power. Out of 194 possible predictor variables, the following 6 turned out to have the highest influence on the model: olanzapine equivalent at discharge from the referenced hospitalization, a history of antipsychotic prescription, a history of antidepressant, benzodiazepine or mood stabilizer prescription, medication compliance, outpatient treatment(s) in the past, and the necessity of compulsory measures. Out of the seven algorithms applied, gradient boosting emerged as the most suitable, with an AUC of 0.86 and a balanced accuracy of 77.5%. Our study aimed to identify the most influential illness-related predictors, distinguishing between FPP and GPP with SSD, thus shedding light on key differences between the two groups. To our knowledge, this is the first study to compare a homogenous sample of FPP and GPP with SSD regarding their symptom severity and course of illness using highly sophisticated statistical approaches with the possibility of evaluating the interplay of all factors at play.

Design and experimental analysis of a piezoelectric energy harvester based on stacked piezoceramic for nonharmonic excitations

In this study, we propose a stacked piezoceramic piezoelectric energy harvester based on inertial force excitation (SP-PEH-IFE) to efficiently harvest nonharmonic excitations. Firstly, the SP-PEH-IFE is theoretically modeled and the stacked piezoceramic is fabricated and tested. Then, impedance matching analysis is conducted in order to determine the optimal value and the energy output is calculated. Subsequently, an experimental setup is established to evaluate the proposed SP-PEH-IFE under both harmonic and nonharmonic excitations. The error between the experimental and numerical output power is less than 14.3% for a base acceleration amplitude of 10 g, demonstrating the accuracy of the SP-PEH-IFE model. Additionally, the effective output power density of the stacked piezoceramic when charging a lithium-ion battery, reached as high as 3.04 mW/cm3 at a nonharmonic base acceleration amplitude of 8 g. It is possible to further improve the output power by using a higher level of excitation or by integrating the harvester with the base structure. As a result of its broadband and high power density characteristics, the SP-PEH-IFE is capable of working in frequency varying and high acceleration conditions to power low energy consumption devices, such as railway transportation monitoring systems, and to reduce the cost of replacing chemical batteries.

Increased noise relates to abnormal excitation-inhibition balance in schizophrenia: a combined empirical and computational study.

Electroencephalography studies link sensory processing issues in schizophrenia to increased noise level-noise here is background spontaneous activity-as measured by the signal-to-noise ratio. The mechanism, however, of such increased noise is unknown. We investigate if this relates to changes in cortical excitation-inhibition balance, which has been observed to be atypical in schizophrenia, by combining electroencephalography and computational modeling. Our electroencephalography task results, for which the local field potentials can be used as a proxy, show lower signal-to-noise ratio due to higher noise in schizophrenia. Both electroencephalography rest and task states exhibit higher levels of excitation in the functional excitation-inhibition (as a proxy of excitation-inhibition balance). This suggests a relationship between increased noise and atypical excitation in schizophrenia, which was addressed by using computational modeling. A Leaky Integrate-and-Fire model was used to simulate the effects of varying degrees of noise on excitation-inhibition balance, local field potential, NMDA current, and . Results show a noise-related increase in the local field potential, excitation in excitation-inhibition balance, pyramidal NMDA current, and spike rate. Mutual information and mediation analysis were used to explore a cross-level relationship, showing that the cortical local field potential plays a key role in transferring the effect of noise to the cellular population level of NMDA.

Characterising the effect of model dormitory on energy-saving intention of college students through the lens of reference points

The demonstration of an energy-conservation model is an important way to increase the energy-saving intention (ESI) of college students. However, the psychological mechanism underlying the effectiveness of such an approach remains unclear, hindering its implementation. This study innovatively elucidates this psychological mechanism from the perspective of reference point (RP). In this study, 125 college students from Xi'an, China, were studied using eye-tracking and a questionnaire with the aim of elucidating the excitation level of RP under the stimulation of different types of energy-saving model dormitories and the corresponding variation in college students' ESI. The relationship between the excitation of the RP and the ESI was then determined using multiple linear regression analysis. Eye-tracking was applied with the aim of measuring the excitation level of the RP, whereas the questionnaire was used to measure the variation in the college students' ESI. The following conclusions were found in this study: (1) Under the stimulation of the energy-saving model dormitory, different RPs were excited to varying degrees. Among the RPs, the group-RP and the negative RP had higher excitation levels; (2) Different types of energy-saving model dormitories affected the ESIs differently. Among the model dormitories, students in the positive low-intensity group exhibited the greatest improvement in ESI; (3) Compared to the group-RP, the excitation of the self-RP had a greater impact on the variation of the college students' ESI, while the pair of ‘positive-negative’ RPs had a smaller impact. The results of the study can help school administrators to effectively develop energy-saving intervention strategies to reduce energy consumption in dormitory buildings.

An investigation into model extrapolation and stability in the system identification of a nonlinear structure

Estimating a nonlinear model from experimental measurements of a vibrating structure remains a challenge, despite huge progress in recent years. A major issue is that the dynamical behaviour of a nonlinear structure strongly depends on the magnitude of the displacement response. Thus, the validity of an identified model is generally limited to a certain range of motion. Also, outside this range, the stability of the solutions predicted by the model are not guaranteed. This raises the question as to how a nonlinear model derived using data from relatively low amplitude excitation can be used to predict the dynamical behaviour for higher amplitude excitation. This paper focuses on this problem, investigating the extrapolation capabilities of data-driven nonlinear state-space models based on a subspace approach. The experimental vibrating structure consists of a cantilever beam in which magnets are used to generate strong geometric nonlinearity. The beam is driven by an electrodynamic shaker using several levels of broadband random noise. Acceleration data from the beam tip are used to derive nonlinear state-space models for the structure. It is shown that model predictions errors generally tend to increase when extrapolating towards higher excitation levels. Furthermore, the validity of the estimated nonlinear models become poor for very strong nonlinear behaviour. Linearised models are also estimated to have a complete view of the performance of each candidate model for each level of excitation.

The Design of Incentive Systems in Digital Game-Based Learning: How Primary School Children Interact with It

Digital game-based learning builds on the general characteristics of games. The incentive system (points, scores, stars, levels, and performance feedback) integrates design elements to keep a learner engaged. In the work described here, we investigated which elements of the incentive system design—rewards, penalties, or feedback—have the potential to trigger students’ motivation to play the game. We used eye tracking of eight primary school children, aged 8–11 years, as they interacted with the incentive system of a mathematics game-based item and its specific design, followed by a semi-structured interview. Eye-tracking results show that students paid minimal visual attention to the incentive system during the game, regardless of their level of performance in the game or their age group. The feedback at the end of the game attracted more of their visual attention and provided a good opportunity to inform them about their performance. The semi-structured interviews revealed a high level of self-reported excitement about playing the game, mainly related to the design of the incentive system. Elements of the incentive system triggered students’ wish for student-to-student competition, which has been shown in the literature on traditional tangible rewards to stifle intrinsic motivation under certain conditions. The results of this study show that the design of the incentive system has the potential to promote extrinsic motivation with the game through rewards and penalties, and open the reflection on its possible spillover effect on intrinsic motivation in digital game-based learning.

Electron impact cross-sections and rate coefficients of Si+2 ions relevant to collisional radiative modeling of silicon plasma

We report on the fine structure resolved electron impact excitation (EIE) cross-sections of Si+2 from its ground state 3s 2 (J= 0) to the 41 excited fine structure levels of the configurations 3s3p, 3p 2, 3s3d, 3s4s, 3s4p, 3s5s, 3s4d, 3s4f, 3s5p, 3s5d and 3s5f using relativistic distorted wave theory. The excitation cross-sections from the excited metastable levels (3P0,3P2) of the configuration 3s3p to higher excited levels as well as for some other dominant transitions relevant to plasma modeling are also obtained. In addition, the ionization cross-sections are evaluated from the ground and metastable levels to higher ionized state Si+3 (2S1/2). The calculated cross-sections are utilized to obtain the rate coefficients corresponding to EIE and ionization processes affecting the intensity of prominent Si+2 emission lines 379.61, 380.65, 456.78, and 457.48 nm recorded through optical emission spectroscopic measurements by Wang et al (2020 Phys. Plasmas 27 063513) on laser produced silicon plasma. Further, the rate coefficients corresponding to radiative, and three body recombination are also presented. The reported cross-sections and rate coefficients will be useful for developing rigorous collisional radiative model for the diagnostics of silicon plasma.

Combination of photos, definitions, and fill-in-the-blank tasks in Quizlet: a concern about learning academic vocabulary in online listening classes

The role of vocabulary has been proven to be crucial in learning both receptive and productive skills. However, in terms of listening skills, students may face enormous challenges in comprehending the content of a listening passage and, therefore, fail to take notes. This study aimed to investigate the impact of using Quizlet more creatively in the vocabulary section of online academic listening classes. Participants were 62 intermediate-level students from two online academic listening classes, divided into a control and an experimental group. While students in the control group did the tasks in their books or handouts from the teacher, those in the experimental group used Quizlet for eight weeks. A mixed method with t-tests and questionnaires was applied in this research. Results from t-tests revealed that students in the experimental group had better performance in remembering the definition of vocabulary they had learned and using correct vocabulary to fill in the blanks in sentences. Findings in questionnaires supported the improvement in the post-test that the students in the experimental group showed a high level of concentration, engagement, and excitement in class. The study's outcome sheds light on further research on using Quizlet in EFL classrooms.

Reinforcing effect of tramadol in the rat

Tramadol is one of the most commonly prescribed analgesic opioids in various pharmacopeias. Tramadol has been linked to abuse in recent clinical investigations. However, the behavioral effects and neural substrates of the drug have not been well characterized in preclinical studies. As a result, the present study investigated the effects of tramadol on behavioral sensitizations in rats. Its impacts on cellular and molecular alterations in the brain were also investigated. In conditioned place preference (CPP) paradigm, tramadol induced behavioral as well as motor sensitizations. These effects were dramatically reduced by intraperitoneal administration of naltrexone, an opioid receptor antagonist. Tramadol caused changes in several molecular markers (pERK1/2, Δ-FosB, PKCγ, PKMζ GAD67) in the anterior cingulate cortex, which could indicate an increase in excitation within this structure. Tramadol is demonstrated in the present study to be a reinforcing drug in rats, as it increased both behavioral and motor sensitizations. Tramadol’s effects are most likely due to the high levels of excitation it causes in the brain, which is mostly caused by the activation of opioid receptors.

Диполярные биэкситоны в латеральных ловушках в гетероструктурах Si/SiGe/Si

Si/SiGe/Si heterostructures with long-range lateral potential fluctuations that appear in the capping Si layer near the SiGe/Si heterointerface due to the presence of relaxed areas in the SiGe layer have been studied. Analysis of the low-temperature photoluminescence spectra indicates that, upon the photoexcitation of the structure, the accumulation of nonequilibrium charge carriers, formation of dipolar excitons, and their recombination take place in large-scale lateral traps formed by these fluctuations. It is found that, at temperatures T < 10 K, a new narrow line appears with an increase in the excitation level at the blue side of the broad photoluminescence band of dipolar excitons localized by short-range potential fluctuations. At temperatures T ~ 2 K, this line is dominant in the spectra even at the lowest excitation levels. It is shown that, at moderate excitation levels, this line is caused by the recombination of free dipolar biexitons in large-scale traps. At high excitation levels, the width of the new line increases by more than a factor of 2 compared to that at lower excitation levels, and under these conditions this line is associated with the recombination of dipolar electron–hole plasma in large-scale traps.

Geometrically Non-Linear Dynamic Behavior of Simply Supported Rectangular Plates Carrying a Concentrated Mass

Simply supported plates carrying an added point mass are encountered in many engineering fields, like circuit boards or slabs carrying machines at different locations. Determination of the plate modified dynamic characteristics is a quite laborious task, especially in the non-linear regime, which is rarely treated in the literature. The added mass effect on the plate linear parameters was first examined using Hamilton’s principle and spectral analysis. The modified plate's non-linear fundamental mode was then calculated and its non-linear response to high levels of harmonic excitation was determined. The non-linear formulation, involving a fourth order tensor due to the membrane forces induced in the plate mid-plane by large vibration amplitudes, led to a non-linear algebraic amplitude equation. The iterative solution gave the free vibration case a better qualitative understanding and a quantitative evaluation of the effect of the added mass. The non-linear forced response of the modified plate, examined for a wide frequency range, shows that the added eccentric mass induces changes in the area between the mass location and the simple supports and decreases the non-linear hardening effect. The numerical results, covering new situations, are expected to be useful in engineering applications necessitating for some reason the addition to the plate of a point mass or an adaptation of the plate frequencies in order to avoid the occurrence of undesirable resonances.

Beyond Hard-Core Bosons in Transmon Arrays

Arrays of transmons have proven to be a viable medium for quantum information science and quantum simulations. Despite their widespread popularity as qubit arrays, there remains yet untapped potential beyond the two-level approximation or, equivalently, the hard-core boson model. With the higher excited levels included, coupled transmons naturally realize the attractive Bose-Hubbard model. The dynamics of the model has been difficult to study due to unfavorable scaling of the dimensionality of the Hilbert space with the system size. In this work, we present a framework for describing the effective unitary dynamics of highly-excited states of coupled transmons based on high-order degenerate perturbation theory. This allows us to describe various collective phenomena -- such as bosons stacked onto a single site behaving as a single particle, edge-localization, and effective longer-range interactions -- in a unified, compact and accurate manner. While our examples deal with one-dimensional chains of transmons for the sake of clarity, the theory can be readily applied to more general geometries.

Differences in gambling behaviors and mental health depending on types of gambling motives among young adults in Korea

ABSTRACT This study explores how various gambling motives are complexly typified among young adults and examines the difference between gambling behavior and problems and mental health according to typed groups of sub-gambling motives. With 243 young adults as subjects, latent class analysis using M-plus was employed to check how the gambling motives of young adults are typified, and chi-test and one-way ANOVA were performed on the differences in gambling behavior, gambling problems, and mental health according to the derived latent group (typing). As a result, the parallel and complex aspects of gambling motives were derived into four types of gambling motives, and according to group characteristics, they were named as follows: low overall motivation group (29.8%), high level of avoidance-focused-complex motivation group (36.4%), high level of excitement and social motivation group (19.0%), and high level of monetary and amusement motivation group (14.9%). According to the types of gambling motives, differences in gambling behavior, gambling problems, and mental health were higher in the high-level avoidance-focused-complex motivation group than in the other groups. Based on these results, we suggest establishing an intervention strategy by carefully evaluating the level of avoidance motivation and its causes when various motives are combined in clinical settings.

Seismic evaluation of frictional FRP piles in saturated sands using shaking table tests

This manuscript presents results of two shaking table tests that were used to characterize seismic performance of Fibre-Reinforced Polymers (FRP) pile groups in saturated sand. A laminar shear box with a dimension of 1.0 m × 1.0 m and a depth of 1.0 m was employed to contain the soil medium and allow the soil to respond in the same fashion as the free field. Two types of composite group piles (2 × 2) made of Carbon FRP (CFRP) and Glass FRP (GFRP) along with a series of Aluminum model piles were manufactured and embedded as frictional piles within the soil. The pile-soil models were subjected to acceleration time histories adopted from the 2010 Val-des-Bois Earthquake in Canada and the 1995 Kobe Earthquake. The foundation motions recorded along the model piles showed significantly higher levels of excitation compared to the accelerations recorded within the soil at the same level. This was attributed to strong interaction between the soil and the foundation, and higher flexural stiffness of the model piles. Pile material was also found to influence the seismic response of pile caps and its superstructure through kinematic soil-pile interaction and possible rocking motion. The aluminum pile cap experienced significantly higher acceleration response compared to the FRP piles. Among the FRP piles, GFRP piles were shown to provide slightly better performance and could be an appropriate alternative piling material for frictional traditional piles especially in liquefiable soils.

Ultimate electromechanical energy conversion performance and energy storage capacity of ferroelectric materials under high excitation levels

In the framework of piezoelectric energy harvesting, this work focused on the quantification of the ultimate energy conversion capability of various ferroelectric ceramics and single crystals. Energy conversion was achieved by the application of Ericsson cycles under high electric field and mechanical stress. The main aim of this approach was to experimentally apply the electromechanical Ericsson cycles on several key materials. This process was decomposed into four steps, which consisted of applying and removing an electric field under constant stress and stress application/removal under a constant electric field. In this work, ferroelectric ceramics—hard PZT C203, medium PZT C6, soft PZT C9, and single crystal PMN-25PT and PZN-8PT—and paraelectric ceramic PMN 15 were tested. The PMN-25PT and PZN-8PT ferroelectric single crystals exhibited higher energy conversion potential than the ceramics in the ferroelectric and paraelectric phases. However, the soft PZT C9 ceramic (107.6 mJ/cm3) was comparable to single crystal PMN-25PT (118.7 mJ/cm3). Considering the cost and fabrication process, PZT C9 is an excellent candidate for practical applications. A simple yet accurate experimental estimation of the energy density of the materials based on the bipolar hysteresis curves under compressive stresses of 1 and 100 MPa was also proposed. The estimated energy densities were similar to the real Ericsson cycles. The energy storage capacity of these materials was also analyzed. The PMN 15 ceramic in the paraelectric phase had the highest stored energy, and in the paraelectric phase, PMN 15 had a maximum stored electrical energy of 87 mJ/cm3 under a static stress value of 1 MPa, which was increased to 105 mJ/cm3 under a static stress value of 100 MPa. Ultimately, this study allowed for the evaluation of the maximal energy conversion capabilities of several classes of electroactive materials, highlighting their potential in terms of their target applications and operative environments (such as the maximal stress or electric field).

Efficient generation of emissive many-body correlations in copper-doped colloidal quantum wells

Colloidal quantum wells (CQWs) provide an appealing platform to achieve emissive many-body correlations for novel optoelectronic devices, given that they act as hosts for strong carrier Coulomb interactions and present suppressed Auger recombination. However, the demonstrated high-order excitonic emission in CQWs requires ultrafast pumping with high excitation levels and can only be spectrally resolved at the single-particle level under cryogenic conditions. Here, through systematic investigation using static power-dependent emission spectroscopy and transient carrier dynamics, we show that Cu-doped CdSe CQWs exhibit continuous-wave-pumped high-order excitonic emission at room temperature with a large binding energy of ∼64 meV. We attribute this unique behavior to dopant excitons in which the ultralong lifetime and the highly localized wavefunction facilitate the formation of many-body correlations. The spectrally resolved high-order excitonic emission generated at power levels compatible with solar irradiation and electrical injection might pave the way for novel solution-processed solid-state devices. • Continuous-wave-pumped high-order excitonic emission at room temperature is shown • The excitation level is compatible with solar irradiation and electrical injection • 64 meV binding energy enables spectrally resolved high-order excitonic emission Yu et al. demonstrate continuous-wave-pumped high-order excitonic emission at room temperature in Cu-doped CdSe colloidal quantum wells. The properties of dopant excitons enable an ultra-low excitation level compatible with solar irradiation or electrical injection and a binding energy of ∼64 meV, which makes the high-order excitonic emission spectrally resolvable at room temperature.

PHOTOLUMINESCENCE OF NANOPHOSPHORS CaAl2O4:Eu3+ IN A WIDE INTERVAL OF TEMPERATURES AND LEVELS OF LASER EXCITATION

We study the spectra of excitation and photoluminescence of CaAl2O4:Eu3+ nanoluminophores in a wide interval of temperatures and laser excitation levels from 40 to 2.3 · 103 kW/cm2. The photoluminescence spectra of CaAl2O4:Eu3+ have the shape of narrow lines and are located in the region 550–750 nm of the visible spectrum. An extremely high stability of the position and shape of the photoluminescence spectra of nanopowders under investigation is established at high levels of laser excitation up to 2.3 · 103 kW/cm2 at a constant luminescence efficiency up to 60 kW/cm2. A further increase in the excitation level leads to a reversible drop in the photoluminescence efficiency. The threshold of an irreversible drop in the luminescence efficiency has not been reached.

The influence of Er3+ ions on the spectroscopic and lasing characteristics of alkaline earth titanium borate glasses for photonic applications

Alkaline earth titanium borate glasses doped with different ratios of Er3+ ions were fabricated using standard melt quenching technique. The density of the glasses increased from 3.652 to 3.762 g/cm3 as the ratio of Er3+ ions increased from 0 to 5.640 × 1020 cm−3. The gaussian deconvolution of the Raman and FTIR spectra was investigated, and the distinctive spectral vibrational bands were assigned. The UV–Vis–NIR absorption spectra of the erbium doped glasses exhibit nine bands located at 1531, 980, 808, 654, 520, 490, 446, 408, and 377 nm due to the electronic transitions of Er3+ ions from the ground level 4I15/2 to the higher excited levels 4I13/2, 4I11/2, 4I9/2, 4F9/2, 2H11/2, 4F7/2, 4F3/2, 2G9/2, and 4G11/2, respectively. The structural and luminescent properties of the erbium doped glasses were investigated by calculating Judd – Ofelt intensity parameters, radiative transition probabilities, branching ratio, lifetime, full width at half maximum (FWHM), and gain bandwidth (FWHM × σemis). The intensity parameters followed the trend as Ω2> Ω6> Ω4 for all glasses. The values of Ω2 decreased from 5.2079 × 10−20 to 3.8133 × 10−20 cm2 and that of Ω4 decreased from 0.7402 × 10−20 to 0.5939 × 10−20 cm2 as the ratio of Er3+ ions increased. The high laser efficiency of the studied glasses were verified by the high values of the radiative lifetime, branching ratio, FWHM, and gain bandwidth. The gain spectra for BaTiBEr3 and BaTiBEr5 glasses covered the conventional (1530–1565 nm) and long (1565–1625 nm) communication bands. Moreover, the high values of the FWHM and gain bandwidth for BaTiBEr3 and BaTiBEr5 glasses, suggested their suitability for photonic applications in the near infrared region and broadband optical fiber amplifiers.