bluuebunny/crossref_metadata_2025_split huggingface dataset:
Nonlinear dynamic modeling and experimental study of full-composite cylindrical shells with a foam-filled cavity lattice core
Authors: Dong Bocheng , Li Hui , Li Kaixiang , Zhang Fei , Qiao Zhou , Yang Yao , Deng Yichen , Wang Shaoming , Bai Hansong , Zhang Haiyang , Cao Hang , Wang Xiangping , Zhou Jin 
Published: August 2023

Abstract
A new full-composite cylindrical shell (FCCS) with a foam-filled cavity lattice core (FFCLC) is developed and prepared, and a nonlinear dynamic model considering the amplitude-dependent property of composite materials is proposed. Compared to traditional linear dynamic models, the lower frequencies and higher resonant responses of structures subjected to base harmonic excitations can be obtained in the proposed nonlinear dynamic model. The nonlinear dynamic behaviors of FFCLC-FCCSs are investigated theoretically and experimentally, in which the fabrication and assembly procedures of FFCLC-FCCS specimens are first provided, and vibration measurements are performed on those specimens subjected to different excitation amplitudes, wherein the soft nonlinear vibration phenomenon characterized by the amplitude-dependent property is discovered. Subsequently, in the framework of the first-order shear deformation theory based on the layerwise principle, the mode superposition approach and the Rayleigh-Ritz method are utilized to obtain the nonlinear frequencies, mode shapes, and resonant responses of the structure subjected to different excitation amplitudes. Therein, the equivalent material parameters of the core part are determined using the modified cross and fill equivalent principle, and the nonlinear elastic modulus with amplitude-dependent fitting coefficients of the skins and core are assumed by the Jones-Nelson nonlinear theory, and those coefficients are determined by using an inverse parameter identification and fitting technique based on experimental test data. Then, the validation work on the developed model is performed by comparing the calculated results of the model with those of the tests. Finally, the impacts of several critical parameters on the nonlinear dynamic behaviors of the structure are estimated, with some suggestions in favor of reducing the nonlinear resonant responses of FFCLC-FCCSs being clarified.
The vibration analysis of a high-speed motorized spindle system considering nonsmooth bearing restoring force and unbalanced magnetic pulling force
Authors: Zhang Xiangming , Ma Zhimin , Jiang Yongying 
Published: August 2023

Abstract
As an important equipment in the field of modern machining, high-speed motorized spindle has a broad application prospect and important research significance. This paper focuses on the dynamic behaviour of high-speed motorized spindle systems. By using the lumped mass method to simplify the motorized spindle system, nonlinear factors such as Hertz contact and bearing time-varying stiffness are considered in the model. In addition, the effects of unbalanced magnetic force and unbalanced mass on the whole system are considered.On this basis, a system of 18-degree-of-freedom differential equations is established to describe the motion of the system. The effects of spindle speed, rotor eccentricity, air gap eccentricity and bearing parameters on the vibration behaviour and stability of the spindle are investigated using analytical methods such as bifurcation diagrams, time-domain waveforms, spectra, trajectories and Poincaré sections. The results show that the variation of spindle speed and bearing parameters has a significant effect on the vibration behaviour and stability of the spindle. The study provides a valuable reference for the design and optimisation of motorized spindle systems and bearing selection.
Attention-based generative adversarial networks for aquaponics environment time series data imputation
Authors: Zhong Keyang , Sun Xueqian , Liu Gedi , Jiang Yifeng , Ouyang Yi , Wang Yang 
Published: August 2023

Abstract
Environmental parameter data collected by sensors for monitoring the environment of aquaponics facility operations are usually incomplete due to external environmental disturbances and device failures. And the missing of collected data is completely at random. In practice, missing data could create biased estimations and make multivariate time series predictions of environmental parameters difficult, leading to imprecise environmental control. A multivariate time series imputation model based on generative adversarial networks and multi-head attention (ATTN-GAN) is proposed in this work to reducing the negative consequence of missing data. ATTN-GAN can capture the temporal and spatial correlation of time series, and has a good capacity to learn data distribution. In the downstream experiments, we used ATTN-GAN and baseline models for data imputation, and predicted the imputed data, respectively. Experiments reveal that ATTN-GAN outperforms all baseline models in terms of data imputation accuracy. The data processed by ATTN-GAN is the best for time series prediction.
Criteria for sizing volumes of activated sludge reactors for wastewater from the recycled paper industry: A new approach to projects
Authors: de Mendonça Henrique Vieira 
Published: August 2023

Abstract
In response to the need for obtaining sizing parameters for activated sludge reactors used for treating effluents from the recycled paper industry, batch reactors were tested at 20°C under different hydraulic retention times (HRT) and 3 ranges of mixed liquor volatile suspended solids (MLVSS) concentrations. Kinetic equations for the removal of BOD5 and COD were obtained, along with a model equation for calculating the volume of activated sludge reactors. Removals above 90% for BOD5 and COD were recorded with 72 hours of aeration and MLVSS concentrations above 4 g L− 1.
Diffraction Managed Soliton in Metamaterial
Authors: Sharma Neeraj , Jana Soumendu , Mishra Manoj 
Published: August 2023

Abstract
This paper presents the Propagation and generation of the electromagnetic breather like diffraction managed soliton for a large range of parametric space through a periodic array of metamaterials with positive and negative diffraction. The governing nonlinear Schrödinger equation is solved analytically and numerically by using Lagrangian variational method and Split Step Fourier method, respectively. Initial beam energy for diffraction managed soliton formation is determined for various sets of diffraction managed metamaterial. A high energy beam can be produced using diffraction managed metamaterial array. Different classes of stability zones for the diffraction managed soliton has been identified.
First rest-frame infrared spectrum of a z &gt; 7 quasar: MIRI-MRS observations of J1120+0641
Authors: Bosman Sarah , Álvarez-Márquez Javier , Colina Luis , Walter Fabian , Herrero Almudena Alonso , Ward M. , Östlin Göran , Greve Thomas , Wright Gillian , Bik Arjan , Boogaard Leindert , Caputi Karina , Costantin Luca , Eckart Andreas , Marin Macarena Garcia , Gillman Steven , Güdel Manuel , Henning Thomas , Hjorth Jens , Iani Edoardo , Ilbert Olivier , Jermann Iris , Labiano Alvaro , Lagage Pierre-Olivier , Langeroodi Danial , Peißker Florian , Ray Thomas , Rinaldi Pierluigi , Topinka Martin , Dishoeck Ewine van , Werf Paul van der , Vandenbussche Bart 
Published: August 2023

Abstract

We present a JWST/MRS spectrum of the quasar J1120+0641 at z = 7.0848, the first spectroscopic observation of a reionisation-era quasar in the rest-frame infrared wavelengths (0.6 < λ < 3.4μm). In the context of the mysterious fast assembly of the first supermassive black holes at z > 7, our observations enable for the first time the detection of hot torus dust, the Hα emission line, and the Paschen-series broad emission lines in a quasar at z > 7, which we compare to samples at z < 6 for signs of evolution. Hot torus dust is clearly detected as an upturn in the continuum emission at λ rest ≃ 1.3μm, leading to a black-body temperature of T dust = 1413.5 +5.7-7.4 K. Compared to similarly-luminous quasars at 0 < z < 6, the hot dust in J1120+0641 is somewhat elevated in temperature (top 1%). The temperature is more typical among 6 < z < 6.5 quasars (top 25%), leading us to postulate a weak evolution in the hot dust temperature at z > 6 (2σ significance). We measure the black hole mass of J1120+0641 based on the Hα Balmer line, MBH = 1.52 ± 0.17 · 109 M⊙ , which is in good agreement with the previous rest-UV Mg II black hole mass measurement. The black hole mass based on the Paschen-series lines is also consistent within uncertainties, indicating that no significant extinction is biasing the MBH measurement obtained from the rest-frame UV. By comparing the ratios of the Hα, Pa-α and Pa-β emission lines to predictions from a simple one-phase Cloudy model, we find that the hydrogen broad lines are consistent with originating in a common broad-line region (BLR) with density logNH /cm−3 ≥ 12, ionisation parameter −7 < log U < −4, and extinction E(B–V)≲ 0.1 mag. These BLR parameters are fully consistent with similarly-bright quasars at 0 < z < 4. Overall, we find that both J1120+0641’s hot dust torus and hydrogen BLR properties show no significant peculiarity when compared to luminous quasars down to z = 0. The quasar accretion structures must have therefore assembled very quickly, as they appear fully ‘mature’ less than 760 million years after the Big Bang.
A procedure for the experimental identification
of the strain gradient characteristic length
Authors: Rezaei Nasrin , Riesselmann Johannes , Misra Anil , Balzani Daniel , Placidi Luca 
Published: August 2023

Abstract
The aim of this paper is to propose an experimental
procedure for determining the characteristic length of a strain gradient
model. The identification problem is studied through a virtual pull-out
test of a rigid bar along the symmetry axis of a cylindrical strain
gradient elastic domain.
To allow an accurate parameter identification
based on measured data, we investigate the effect of the characteristic
length on the mechanical fields for this problem. We see a significant
sensitivity of the inflection point of the displacement profile evaluated
on the cross-section of the cylinder, with respect to the characteristic
length. By adjusting the characteristic length of strain gradient
such that the theoretical models match best with experimental measurements
of the surface displacement fields, the characteristic length of strain
gradient can be estimated.
In order to allow for more efficient analysis
and an almost real-time parameter identification the initial three-dimensional
(3D) problem is reduced to a one-dimensional (1D) problem by exploiting
the cylindrical symmetry of the problem. As will be shown, an accurate
1D finite element method (FEM) strain gradient solution can be obtained
for this simplified problem. Since the cylindrical symmetry is only
true in an infinitely long cylinder, specific boundary conditions
are constructed on a cylinder of finite length, which are then used
for the comparison of the 1D and 3D problem. Results show, however,
that the structural response at the inflection point is insensitive
to whether the specific boundary conditions are considered or not,
which is why the 1D model can be used for parameter identification.
Since the proposed approach is methodological, it can be applied to
any material. As a prototype problem in this paper, we consider the
case of bar embedded in portland cement concrete.
Experimental investigation of a novel hybrid desalination system using photovoltaic-thermal (PVT) collector with energy, exergy, environmental and economic (4E) analysis
Authors: S RAJESH , CHIRANJEEVI CHALASANI 
Published: August 2023

Abstract
Freshwater and clean energy are essentially required for comfortable habitats living on the globe. The increasing demand for these can be accomplished with sustainable technologies like photovoltaics, solar desalination and their combinations. The current research focuses on the experimental evaluation of hybrid thermal desalination integrated with a photovoltaic-thermal (PVT) panel by energy, exergy, environmental and economic analysis. The proposed integrated thermal desalination system is a combination of a stepped solar still (SSS) and a humidification dehumidification (HD) system. A laboratory-level indigenous hybrid desalination unit is designed, developed and tested in the actual outdoor conditions of Vellore, India during the third week of May 2023. A unique novel bi-directional serpentine flow thermal absorber-based PVT panel is used to preheat saline water entering stepped solar still. The rejected brine from SSS is used in the HD system for further extraction of freshwater. Experiments were conducted for a saline water flow range of 1.5 to 3 litres per minute. The experimental results depict that the PVT average electrical efficiency is enhanced by 0.4 % over the reference PV panel. Daily potable water production of the hybrid PVT-SSS-HD unit is observed in the range of 6400 to 7450 ml/m2. Further, the gain output ratio of the hybrid system is observed between 5.99 and 6.35. The overall efficiency and the unit litre freshwater cost in USD of the hybrid system are observed in the range of 61.17 % to 67.71 % and 0.079 to 0.068 respectively.
The Relationship Between HER2 Status Acquired From Pathological Data and Metabolic Parameters From Pre-treatment 18F-FDG PET/CT in Gastric Adenocarcinomas
Authors: Tayyar Merve Nur Acar , Tamam Müge Öner , Babacan Gündüzalp Buğrahan , Şahin Mehmet Can , Özçevik Halim , Erhan Selma Şengiz 
Published: August 2023

Abstract
Aim
This study aimed to investigate the relationship between pathological data with strong importance to Human Epidermal Growth Factor Receptor 2 (HER2) status, and pre-treatment 18F-FDG PET/CT semi-quantitative metabolic parameters in gastric adenocarcinomas and their impact on survival.
Methods
A retrospective analysis was conducted on 117 patients with gastric cancer who underwent 18F-FDG PET/CT for staging. PET/CT results were evaluated for SUVmax, SUVmean, metabolic tumor volume (MTV), total lesion glycolysis (TLG), HER2 status, pathological data, and tumor markers.
Results
Of the 117 patients, 17.1% were HER2 + and 82.9% were HER2-. SUVmax was significantly lower in tubular adenocarcinoma (TA) patients with signet ring cell (SRC) component compared to those without SRC component. Tumor size > 5 cm positively correlated with MTV and TLG in patients who underwent total resection. Vascular invasion and local invasion (T3/T4) were associated with higher SUVmax. Patients with distant metastasis had significantly higher SUVmax, SUVmean, and TLG. Stage 3/4 patients showed positive correlations with CEA and CA19-9 values. The tumor's localization in the cardia correlated significantly with HER2 positivity in the TA group. Survival analysis revealed higher 1-year and 3-year survival rates in the HER2 + group compared to the HER2- group.
Conclusion
18F-FDG PET/CT evaluation for staging provides non-invasive guiding findings for treatment and prognosis. The histological components should be performed in tubular adenocarcinomas PET/CT can predict histological components, local invasion, and vascular invasion. Evaluating metabolic parameters in the primary tumor focus using PET/CT can demonstrate the presence of distant metastasis. The relationship between tumor localization in the cardia and HER2 positivity may be useful in predicting anti-HER2 antibody treatment options. Further extensive studies are needed on this topic.
Clinical investigation of a monofocal intraocular lens with enhanced intermediate vision and a rotationally asymmetric multifocal intraocular lens with near addition of + 1.5 diopters
Authors: Waki Madoka , Shiba Tomoaki , Usui Tomohiko 
Published: August 2023

Abstract
Background: The Lentis® Comfort LS-313 MF15 (Oculentis, Berlin, Germany) is a latest-generation rotationally asymmetric multifocal intraocular lens (IOL) with a near-addition of +1.5 diopters. The newly developed monofocal lens Tecnis Eyhance™ DIB00V (Johnson & Johnson Vision, Santa Ana, CA, USA) provides favorable distance vision as well as an aspherical lens with increased power from the periphery to the center, plus strengthened intermediate vision. The purpose of this study was to compare the short-term postoperative visual functions of patients implanted with an Eyhance IOL with that of patients implanted with a Lentis IOL.
Methods: We retrospectively studied 36 patients who had undergone cataract surgery with implantation of an Eyhance IOL (19 eyes in 19 patients) or a Lentis IOL (17 eyes in 17 patients). The following were evaluated at the 3-month post-operation clinic visit: the monocular uncorrected and corrected distance (5 m) visual acuity (UDVA and CDVA), the uncorrected and corrected intermediate (70 cm) visual acuity (UIVA, CDVA), additional plus diopter for intermediate vision (Add D) and the area under log contrast sensitivity function (AULCSF) under photopic with glare, photopic without glare, mesopic with glare, and mesopic without glare conditions. A defocus curve was made from each patient’s manifest refraction.
Results: There were no significant post-operative differences in the UDVA, CDVA, UIVA, CIVA, or additional plus Dfor intermediate vision between the Eyhance and Lentis groups. The post-operative AULCSF for the mesopic with glare condition tended to be wider in the Eyhance group than the Lentis group while that for the mesopic without glare condition was significantly wider for the Eyhance group than the Lentis group.
At the defocus level of -0.5D, visual acuity was significantly better maintained in the Eyhance group than the Lentis group, but at the defocus level of -3.0D, visual acuity was significantly better maintained in the Lentis group than the Eyhance group.
Conclusion: Our analyses revealed that at 3 months post-operation the clinical outcomes of distance and intermediate visual acuity without correction were similar for patients with an implanted Eyhance IOL and those with a Lentis IOL.
Fluvoxamine inhibits Th1 and Th17 polarization and function by repressing glycolysis to attenuate autoimmune progression in type 1 diabetes
Authors: Zou Yuan , Zhang Jing , Sun Fei , Chen Longmin , Xu Qianqian , Luo Xi , Zhou Qing , Zhang Shu , Xiong Fei , Kong Wen , Yang Ping , Yu Qilin , Liu Shiwei , Wang Congyi 
Published: August 2023

Abstract
Background
Fluvoxamine is one of the selective serotonin reuptake inhibitors (SSRIs) that are regarded as the first-line drugs for major depression treatment. It has been also recognized with the potential to treat inflammatory diseases and viral infection. However, the effect of fluvoxamine on the development of type 1 diabetes (T1D) and the related cellular and molecular mechanisms are yet to be addressed.
Method
Herein in this report, we treated NOD mice with fluvoxamine for 2 weeks starting from 10-week of age to dissect the impact of fluvoxamine on the prevention type 1 diabetes. We compared the differences of immune cells between 12-week-old control and fluvoxamine-treated mice by flow cytometry analysis. To study the mechanism involved, we extensively examined the characteristics of CD4+ T cells with fluvoxamine stimulation using RNA-seq analysis, real-time PCR, Western blot, and seahorse. Furthermore, we investigated the relevance of our data to human autoimmune diabetes.
Result
Fluvoxamine not only delayed T1D onset, but also decreased T1D incidence. Moreover, fluvoxamine-treated NOD mice showed significantly attenuated insulitis coupled with well-preserved β cell function, and decreased Th1 and Th17 cells in the peripheral blood, pancreatic lymph nodes (PLNs) and spleen. Mechanistic studies revealed that fluvoxamine downregulated glycolytic process by inhibiting Phosphatidylinositol 3-Kinase (PI3K)-AKT signaling, by which it restrained effector T (Teff) cell differentiation and production of proinflammatory cytokines.
Conclusion
Collectively, our study supports that fluvoxamine could be a viable therapeutic drug against autoimmunity in T1D setting.
Political Instability and Hiv/aids Response in the South West and North West Region of Cameroon: a Qualitative Study
Authors: Mekolle Julius Enongene , Tshimwanga Katayi Edouard , Ongeh Juste Niba , Agbornkwai Agbor Nyenty , Omeichu Agwenam Amadeus , Esa Ismaela , Mekolle Keshia Ebude , Forbinake Ndung Ako , Nkfusai Claude Ngwayu , Atanga Pascal Nji 
Published: August 2023

Abstract
Background: Politically motivated violence and insecurity continue to be a major threat to HIV progress and a significant contributor to health inequality. Despite a decreasing HIV/AIDS disease burden, the Republic of Cameroon in West Africa is experiencing ongoing political instability in her North and South West Regions. Our study used qualitative methods to better understand key frontline health care providers' (fHCP) perceptions of the effects of political instability on HIV/AIDS response gains in Cameroon since 2018, as well as lessons learned for overcoming them.
Methods: Between July and August 2022, semi-structured, in-depth key informant interviews involving 10 purposively selected participants were conducted in the two regions. Interviews were recorded and transcribed verbatim, coded thematically, and analyzed manually.
Results: Six overarching themes emerged from the transcribed key informant interviews. They were as follows: (1) Challenge with access to and availability of health care services (HIV care, commodity supply chain) in the smaller communities; (2) Impact on continuity of treatment; (3) Increased risk of new HIV infections. (4) The socioeconomic impact of the crisis on the quality of life; (5) The impact of the crisis on fHCPs' physical and mental health and the health system'; and (6) Coping mechanisms
Conclusions: Frontline healthcare workers have acknowledged the significant impact the current political instability has had in hindering the development and advancement of a successful local response to HIV/AIDS in the two impacted regions of Cameroon. Coordinated efforts must be made to strengthen the health sector in areas such as HIV healthcare decentralization, supply chain, and protecting frontline healthcare workers from political quagmires in order to lessen the impact of the nation's socio-political crisis on the HIV/AIDS response and, more generally, on the entire health sector.