bluuebunny/crossref_metadata_2025_split huggingface dataset:
Color tunability and NIR luminescence in Cr3+/Li+ co-doped ZnGa2O4 phosphor for solid state lighting and NIR LEDs
Authors: Monika  , Yadav R S , Bahadur A , Rai Shyam Bahadur 
Published: September 2023

Abstract
In this work, we report the color tunable photoluminescence in the Cr3+/Li+ doped and co-doped ZnGa2O4 (ZGO) phosphors synthesized by solid state reaction method. The phase and surface morphology of ZGO phosphor were examined by XRD and SEM measurements, respectively. The EDS spectra revealed the presence of Zn, Ga, Cr and O elements in the phosphor. The vibrational structure of the phosphor materials has been analyzed by FTIR measurements. The Cr3+ doped phosphor shows electronic absorption bands at 302, 408 and 544 nm alongwith the host CTB at 260 nm. The optical band gap of the phosphor decreases via doping of Cr3+ and Cr3+/Li+ ions. The ZGO is a self-activated host and emits broad blue emission with maximum at 434 nm upon excitation at 260 nm. The Cr3+ doped phosphors show emission bands due to spin-allowed as well as spin-forbidden transitions due to Cr3+ ion in the blue, green and NIR regions on excitation with 260, 302, 408 and 544 nm wavelengths. The emission intensity is optimum for 0.5 mol% concentration of Cr3+ ion. The emission intensity of Cr3+ doped ZGO phosphor increases via doping of Li+ ion. The color tunability has been observed in the phosphor upon 260 and 302 nm excitations. The lifetimes of 4T2 (4F) and 2E states of Cr3+ ion have been measured and it is found that it decreases with increasing concentrations of Cr3+ and Cr3+/Li+ ions. The Cr3+/Li+ doped and co-doped ZGO phosphors may be suitable candidates for display devices, solid state lighting and NIR LEDs.
Exploring and optimizing the performance of inorganic Cs2TiBr6 halide perovskite solar cell with Cu2ZnSnS4 as hole transport layer by device simulation
Authors: Chen Qi , Qiao Zaixiang 
Published: September 2023

Abstract
To seek appropriate substitutes for lead-based perovskite, a perovskite solar cell (PSC) model using Cu2ZnSnS4 as the hole transport layer (HTL) and Cs2TiBr6 as the absorber layer is proposed in this study. The focus of this study is to discuss the drift and diffusion ability of charge carriers in the n-i-p structure formed by ZnO/Cs2TiBr6/Cu2ZnSnS4 under the action of the built-in electric field and concentration gradient. And based on the data simulated by SCAPS-1D, the effects of bandgap structure and device structure on carrier mobility, carrier lifetime, carrier diffusion length, improvement of device performance of the device were further explored. In addition, the effects of HTL types, thickness of HTL, absorber, and ETL, and defect density of absorber on device structure and behavior were analyzed through simulation by SCAPS-1D. The theoretical calculation results obtained by optimizing the structural parameters include 29.24% power conversion efficiency (PCE), 1.22 V open circuit voltage (V

oc
), 26.79 mA cm−2 short circuit current (J

sc
) and 89.78% fill factor (FF). The conclusion that the n-i-p structure formed by ZnO/Cs2TiBr6/Cu2ZnSnS4 is conducive to carrier migration is vindicated in this study, which enables devices to possess better performance. This study provides a theoretical basis for the application of Cu2ZnSnS4 in inorganic halide-based PSCs.
Outstanding NLO response of K3O@thia[n]circulenes; a DFT and molecular dynamics perspective
Authors: Kosar Naveen , Mahmood Tariq 
Published: September 2023

Abstract
The nonlinear optical (NLO) response of superalkali (K3O) doped thia[7&8]circulenes (1–18) is analyzed through density functional theory (DFT) calculations. The high interaction energies illustrate thermodynamic feasibility of these complexes. Natural bond orbital (NBO) charge analysis confirmed that electronic charge is transferred from K3O toward thia[7&8]circulenes. Additionally, the lowest unoccupied molecular orbital (LUMO)—the highest occupied molecular orbital (HOMO) energy gaps are reduced up to 0.81 eV after doping. Polarizability (α
o) and the first hyperpolarizability (β
o) values are used to estimate NLO response of doped circulenes. The highest α
o and β
o obtained for K3O doped thia[7&8]circulene (9) are 7297 au and 3.03 × 108 au, respectively. Two level model illustrates that the excited dipole moment as decisive factor for enhancement of NLO response. The electronic excitation is confirmed from ultraviolet-visible (UV–vis) spectroscopic analysis where all doped circulenes showed bathochromic shift. Ab initio molecular dynamics depicts strong interaction and high thermal stability of K3O doped thia[7]circulene 9. Thus, K3O doping on thia[n]circulenes (n = 7&8) remarkably enhanced the NLO response which assures the use of respective complexes in designing of building blocks for future optics.
Energy flow and stochastic resonance in a memristive neuron
Authors: Hou Bo , Hu Xikui , Guo Yitong , Ma Jun 
Published: September 2023

Abstract
Static distribution of intracellular ions including calcium, sodium and potassium activates spatial distribution of electric field and energy is kept in the biological neurons. Continuous propagation of the intracellular and extracellular ions across the membrane channels can induce magnetic field accompanying with diffusion of field energy as well. In this paper, two kinds of memristors are connected in parallel and they are used as memristive channels for building a new neural circuit, which can perceive external magnetic field and electric field synchronously. The memristive channel developed from the charge-controlled memristor (CCM) can discern the changes of external electric field, and another memristive channel based on the magnetic flux-controlled memristor (MFCM) can detect the fluctuation of external magnetic field. The inner electromagnetic field energy is shunted between the capacitor, inductor and two memristors, and the inner field energy is described by an equivalent Hamilton energy H for this neuron including a sum for four terms (H

C

, H

L

, H

M

, H

W
). The energy proportion of memristive channel to total energy is controlled to realize mode selection and transition in the firing patterns. Noisy disturbance is applied to discern the occurrence of stochastic resonance in this memristive neuron.
Electronic structure of P-type amorphous silicon nanowires
Authors: Prayogi Soni , Kresna  , Cahyono Yoyok , Darminto  
Published: September 2023

Abstract
Silicon nanowires can improve broadband optical absorption and reduce the radial carrier collection distance in solar cell devices. The disordered nanowire arrays grown by the Plasma-Enhanced Chemical Vapor Deposition method are attractive because they can be embedded on low-cost substrates such as glass, and are compatible with large areas. Here, we experimentally demonstrate that reactive Hydrogen ions with increasing concentrations are doped to construct nanowire architectures in amorphous silicon solar cells. Similar to our investigated planar a-Si: H layers, the amorphous silicon nanowires exhibit a loss function coefficient of about 105/cm. From the reflectivity function, it can be shown that the nanostructures can offer a reliable carrier pool. Our results show that the addition of nanowires can increase the efficiency of a-Si solar cells from 1.11% to 1.57%. The input-photon-to-current conversion efficiency spectrum shows effective carrier collection from 1.2 to 2.2 eV of incident light and the nanowire devices show an increase in short-circuit current of 15% with amorphous Si and 26% with nanocrystalline Si compared to planar devices appropriate.
Pulsar timing residual induced by ultralight tensor dark matter
Authors: Wu Yu-Mei , Chen Zu-Cheng , Huang Qing-Guo 
Published: September 2023

Abstract
Ultralight boson fields, with a mass around 10-23 eV, are promising candidates for the elusive cosmological dark matter. These fields induce a periodic oscillation of the spacetime metric in the nanohertz frequency band, which is detectable by pulsar timing arrays. In this paper, we investigate the gravitational effect of ultralight tensor dark matter on the arrival time of radio pulses from pulsars. We find that the pulsar timing signal caused by tensor dark matter exhibits a different angular dependence than that by scalar and vector dark matter, making it possible to distinguish the ultralight dark matter signal with different spins.
Combining the gravitational effect and the coupling effect of ultralight tensor dark matter with standard model matter provides a complementary way to constrain the coupling parameter α.
We estimate α ≲ 10-6 ∼ 10-5 in the mass range m < 5 × 10-23 eV with current pulsar timing array.
Tail diversity from inflation
Authors: Hooshangi S. , Namjoo M.H. , Noorbala M. 
Published: September 2023

AbstractThe tail of the distribution of primordial fluctuations (corresponding to the likelihood of realization of large fluctuations) is of interest, from both theoretical and observational perspectives. In particular, it is relevant for the accurate evaluation of the primordial black hole (PBH) abundance. In this paper, we first analyze the non-perturbativeδNformalism as a method to non-perturbatively estimate the probability distribution function (PDF) of primordial fluctuations, discuss its underlying assumptions and deal with several subtleties that may arise as a result of considering large fluctuations. Next, we employ the method to study several non-attractor single-field inflationary models as the simplest examples that may lead to the abundant production of PBHs. We conclude that the Gaussian extrapolation from linear perturbation theory may fail drastically to predict the likelihood of large fluctuations. Specifically, we show that a truncation of the tail, a power-law tail, a double-exponential tail, and a doubly peaked distribution can all be realized for the curvature perturbation in the single-field non-attractor models of inflation. We thus show that there is a diverse zoo of possible tails from inflation so that a model-dependent, non-perturbative study of the distribution of the primordial fluctuations seems inevitable concerning PBH abundance.
Bounds for imaginarity of quantum superpositions
Authors: Qi Xianfei 
Published: September 2023

Abstract
Complex numbers play a key role in classical and quantum physics. Recently, the comprehensive formulation of the resource theory of imaginarity was proposed and various computable and meaningful measures of imaginarity were identified. In this work, we investigate the bounds for imaginarity of quantum superpositions in high dimension using the geometric imaginarity. We establish the relationship between the imaginarity of the superposition of quantum states and the imaginarity of the states being superposed.
Rheology of nanofluids. Experiments and molecular dynamics modeling
Authors: Ya Rudyak V 
Published: September 2023

Abstract
This article discusses the rheology of nanofluids with ordinary spherical particles. It has been shown that about a quarter of nanofluids at not too low concentrations turn out to be pseudo- or viscoplastic. Their rheology is well described by power-law fluid or Herschel–Bulkley models. To study the mechanism of rheology change, the method of nonequilibrium molecular dynamics is used. It is established that the change in rheology has a threshold character. Critical values of the shear rates of rheology change and their dependence on the concentration of nanoparticles, their size and material are found. It is shown that the change in rheology is accompanied by a change in the structure of the studied fluids, which is illustrated by the corresponding radial distribution functions.
Designs of three different octagonal-shaped antennas for microwave-based breast cancer detection
Authors: Avşar Aydın Emine , Aydın Ahmet , Sarıbaş Gözde 
Published: September 2023

Abstract
Today, there are numerous studies on Microwave Imaging
Methods. Thanks to these studies, the success and accuracy rate,
especially in breast cancer diagnosis, increases. Microstrip
antennas are used in the microwave imaging method. In this study,
three different antenna models aimed to be used in microwave imaging
methods were designed on the CST Studio Suite program. The designed
antennas have been tested on the phantom model in the simulation
environment. The test results were examined, and the designed
antennas were produced using 3D printing technology. The built
antennas were tested in the laboratory using the phantom and
tumor-containing phantom models and obtained results were compared.
The alignment results of the tandem EPU at Taiwan Photon Source
Authors: Tseng F.H. , Chung T.Y. , Huang H.Y. , Cheng C.M. , Hua C.Y. , Hsiao Y.M. , Liu Y.C. 
Published: September 2023

Abstract
Since its inauguration for user applications in 2016, the Taiwan Photon Source (TPS) has facilitated numerous research endeavors. The current investigation focuses on the alignment results of a tandem Elliptically Polarizing Undulator (EPU) situated within an extended double minimum beta y long straight section. The objective is to augment the photon flux of the synchrotron light generated by the tandem EPU via accurate alignment and using a phase shifter to attain temporal coherence. A cross-correlation function is employed to scrutinize the beam parameters associated with the source points to evaluate the temporal coherence of the two light sources emitted from the tandem EPU.
Preparation of a scaffold for a vascular network channel with spatially varying diameter based on sucrose
Authors: Chen Siyu , Gao Qianmin , Hu Qingxi , Zhang Haiguang 
Published: September 2023

Abstract
In the past few decades, although tissue engineering has made significant progress and achieved many accomplishments, there are still some key problems that remain unsolved. One of the urgent research challenges in this field is how to prepare large-scale tissue engineering scaffolds with spatially complex structures. In this work, a sacrificial template process using sucrose as the sacrificial material and a gelatin/microbial transglutaminase mixed solution as the bio-scaffold material is proposed to fabricate a bio-scaffold with multi-level branching and spatially complex vascular network channels that mimic the structure and function of the human vascular network. To validate the feasibility of the fabrication process and the rationality of the process parameters, the morphological characteristics, connectivity of vascular network channels, shaping accuracy, and mechanical properties of the bio-scaffold were tested and analyzed. The results showed that the bio-scaffold fabricated using this process had a complete morphology and excellent connectivity. The diameter of the sucrose sacrificial template showed a linear relationship with the feeding speed, and the average diameter error rate between the sucrose sacrificial template and the vascular network channels inside the bio-scaffold was less than 8%. The mechanical properties of the bio-scaffold met the requirements for large-scale tissue defect repair. To evaluate the effect of the bio-scaffold on cell activity, human umbilical vein endothelial cells (HUVECs) were seeded into the vascular network channels of the bio-scaffold, and their attachment, growth, and proliferation on the surface of the vascular network channels were observed. To further assess the biocompatibility of the bio-scaffold, the bio-scaffold was implanted subcutaneously in the dorsal tissue of rats, and the tissue regeneration status was compared and analyzed through immunohistochemical analysis. The results showed that the vascular network channels within the bio-scaffold allowed uniform cell attachment, growth, with fewer dead cells and high cell viability. Moreover, clear cell attachment and growth were observed within the vascular network channels of the bio-scaffold after implantation in rats. These results indicate that the fabricated bio-scaffold meets the basic performance requirements for the repair and regeneration of large-scale tissue defects, providing a new approach for oxygen and nutrient transport in large-scale tissues and opening up new avenues for clinical applications.
Critical parameters for calibration and validation of traffic studies
Authors: Maleanu M. , Racanel C. 
Published: September 2023

Abstract
Since the last two decades a lot of efforts were made in order to produce methodologies there are able to model traffic characteristics and present anticipative traffic condition. New software programs include a lot of parameters that can affect how a simulation approaches reality. In order to minimize the resources needed for the analysis of a traffic scheme, it is necessary to use a method that allows the modification of only the critical parameters. In this study, the main factors with major influence in the calibration and validation of microsimulation models were identified. Based on predetermined graphics, users have the ability to complete faster a traffic study.
Enhancing cotton harvesting efficiency through elliptical drum design: a comparative analysis of spindle performance in the working area
Authors: Ravutov Sh T , Rizayev A A , Rajapbaev U A 
Published: September 2023

Abstract
This article describes improving the working conditions of the vertical spindle cotton harvester in the cotton collection zone (working area). A comparative analysis of the performance of spindles in standard and elliptical drums in the working area was conducted. A significant increase in the gripping capacity of the spindles was observed due to their elliptical trajectory, resulting in an increase in the contact surface of the spindles with the cotton plants and the number of spindles participating in the collection process. The main criteria for evaluating the gripping capacity of spindles were the simultaneous activity of the spindles and the compressive forces exerted by the drums on the cotton bolls during their presence in the working area. The boundary positions of the spindles, within which they have gripping capacity, were determined, allowing the development of a methodology for determining the time of spindle presence in the working area for both elliptical and standard drums in an actively oriented state. The results of a numerical experiment comparing the time of spindle presence in the collection zone on elliptical and standard drums showed the ability to control the contact time of the spindles with the cotton bolls by varying the geometric parameters of the elliptical drum.
Influence of tire internal pressure on soil compaction
Authors: Tukhtabayev M A , Atakhanov H B , Sidikov O A 
Published: September 2023

Abstract
The article presents the results of choosing tires for driving wheels of cotton-growing row-crop tractors during inter-row cultivation. The track surfaces of tires 15.5-38, 16.9R38, 420/85R38 and 18.4R38 are compared on a rigid base. The track surfaces for hard base and maximum pressure of tires on soil, soil density and tire tread depth were determined in experimental studies. When choosing tires, their average qav
and maximum q
max pressures on soil were determined. In order to reduce compaction impact of the tractor’s undercarriages on soil, impact force of the tire internal pressure and vertical load on soil are determined. When using with larger profile width of tires working between rows leads to crushing of seedlings, and the smaller profile leads to an increase in compaction effect on soil. By choosing the right tires and substantiating their parameters, the beneficial living organisms that increase soil fertility are not allowed to die. The tractor equipped with 18.4R38 tires was used with a wide width agricultural machinery in cotton field. As a result, the number of field crossings of the aggregate reduced by 1.87 times, soil compaction is prevented, and fuel consumption reduced by 25%.
The results of performance tests of engine oil on Claas tractors taking into account climatic factors
Authors: Umirov N T , Ganiboyeva E 
Published: September 2023

Abstract
The article presents the influence of operating conditions on the design of vehicles, the increase in ambient temperature on changes in the performance properties of lubricants. Methodology for conducting experimental studies and evaluation parameters for determining the base number of motor oils is proposed. Test results of Agrimot 15W-40 engine oil for base number on tractors Claas are obtained.
Mathematical modeling of the movement of the guide wheel of the cotton MX harvesting machine
Authors: Abdazimov A D , Sherkobilov S M , Axmedov D A , Shodiev J G 
Published: September 2023

Abstract
The article presents the results of the research conducted in order to improve the accuracy and controllability of driving along the cotton row, which is an important factor in increasing the efficiency of the tractor semi-mounted cotton harvesting machine. The article describes the results of mathematical modeling of the movement of the guide wheels of the cotton harvesting machine. The results were obtained with the help of experimental tests.
Straw harvesting equipment for combine harvesters in dry land harvesting
Authors: Astanakulov K D , Ashurov N A , Turdibekov A R 
Published: September 2023

Abstract
Currently, in Uzbekistan, wheat and barley grown in dry lands are harvested with a combine harvester, and the straw is piled on the ground. However, due to their low yield (12-16 t/ha) in dry lands, straw is not suitable. As a result, most of the straw, especially the small ones, remains on the ground when it is collected with straw baler, and there is a lot of destruction. This is the reason for low accumulation of the important roughage used for feeding livestock for farms engaged in cattle breeding in dry lands. Taking this into account, the structural and technological scheme of the device that collects straw directly into trailers for grain harvesters was developed. In order to determine the parameters of the straw harvesting device installed on grain combines, which ensure the required performance and performance, the researched parameters of its working parts and their intervals were determined. Now, by making an experimental copy of the device, installing it on a grain combine, work will be carried out to determine the optimal parameters of the working parts.
The use of calcium peroxide CaO2 for wastewater treatment from chromium (VI)
Authors: Kurbangaleeva Milyausha 
Published: September 2023

Abstract
The at meant of waste water from hexavalent chromium ions with calcium per oxide CaO2 was investigated. This product is obtained from soda ash production waste. Clarified part of still waste suspension (distillation suspension) contains calcium chloride and sodium chloride. The process of producing calcium peroxide is based on the interaction of calcium chloride with solutions of calcium peroxide and sodium hydroxide. A two-step (reagent) method of purification from hexavalent chromium is proposed. The first stage of the reagent method consists in reducing (conversion) toxic hexavalent chromium to a less dangerous trivalent chromium, and the second - in converting trivalent chromium to an insoluble state (into a hydroxide). The conversion (reduction) of Cr6+ to Cr3+ is carried out using calcium peroxide as a reagent. Reductionis carried out in an acidic medium, and to precipitate trivalent chromium in the form of chromium hydroxide (Cr(OH)3) waste water is neutralized using neutralizer Ca(OH)2. This method of wastewater treatment from hexavalent chromium can be effective in small and medium production, especially in the absence of general treatment facilities.