Field Shift Research Articles

Do you get what you see? Insights of using mAP to select architectures of pretrained neural networks for automated aerial animal detection.

The vast amount of images generated by aerial imagery in the context of regular wildlife surveys nowadays require automatic processing tools. At the top of the mountain of different methods to automatically detect objects in images reigns deep learning's object detection. The recent focus given to this task has led to an influx of many different architectures of neural networks that are benchmarked against standard datasets like Microsoft's Common Objects in COntext (COCO). Performance on COCO, a large dataset of computer vision images, is given in terms of mean Average Precision (mAP). In this study, we use six pretrained networks to detect red deer from aerial images, three of which have never been used, to our knowledge, in a context of aerial wildlife surveys. We compare their performance along COCO's mAP and a common test metric in animal surveys, the F1-score. We also evaluate how dataset imbalance and background uniformity, two common difficulties in wildlife surveys, impact the performance of our models. Our results show that the mAP is not a reliable metric to select the best model to count animals in aerial images and that a counting-focused metric like the F1-score should be favored instead. Our best overall performance was achieved with Generalized Focal Loss (GFL). It scored the highest along both metrics, combining most accurate counting and localization (with average F1-score of 0.96 and 0.97 and average mAP scores of 0.77 and 0.89 on both datasets respectively) and is therefore very promising for future applications. While both imbalance and background uniformity improved the performance of our models, their combined effect had twice as much impact as the choice of architecture. This finding seems to confirm that the recent data-centric shift in the deep learning field could also lead to performance gains in wildlife surveys.

Spin mixing conductance and spin magnetoresistance of the iridate/manganite interface

We present results on experimental studies of spin current, measured under spin pumping at ferromag-netic resonance in wide frequency band 2-20 GHz for SrIrO3/La0.7Sr0.3MnO3 heterostructures fabricated by RF magnetron sputtering at high temperature. The epitaxial growth of the thin film in heterostructure by a cube-on-cube mechanism was confirmed by XRD and TEM analysis. Taking into account the con-tribution of anisotropic magnetoresistance the spin current was estimated as 1/3 of the total response. We show that both real and imaginary parts of spin mixing conductance are valuable for heterostructures with strong spin-orbit interaction in SrIrO3. Imaginary part of spin mixing conductance was estimated by means of shift of ferromagnetic resonance field of La0.7Sr0.3MnO3 layer in heterostructure. The spin mag-netoresistance was evaluated from angular dependencies of magnetoresistance measured in planar Hall configuration. In order to extract the influence of anisotropic magnetoresistance a La0.7Sr0.3MnO3 film was measured as well. The spin Hall angle for heterostructure was found higher than for interface Pt/ La0.7Sr0.3MnO3.

Quantitative Review of Anesthesia in Liver Tumor Ablation: A Bibliometric Study from 1999 to 2022.

BACKGROUND Ablation has been developed as a radical surgical procedure for liver tumors. Local anesthesia in combination with general anesthesia or intravenous sedation is needed in ablative procedures. Although many studies have been published, a related bibliometric study is lacking. The present bibliometric analysis aimed to further understand the current situation of anesthesia for liver tumor ablation and discover candidate novel research directions. MATERIAL AND METHODS Web of Science Core Collection (WoSCC) was searched to identify studies associated with anesthesia for liver tumor ablation. Also, countries, journals, authors, and institutes contribution together with co-occurrence relations were analyzed by R, VOSviewer, and CiteSpace software; meanwhile, relevant research hotspots together with potential future trends were identified. RESULTS This work obtained 183 English-language documents during 1999-2022, and the annual growth rate was 8.83%. Most studies were conducted in the United States (24.04%, 44/183). The Oslo Univ Hosp contributed the most publications (n=11, 6.01%). Livraghi T (n=6), De Baere T (n=5), and Goldberg SN (n=4) ranked top in terms of cited authors and top authors. Keywords from that co-cited network were aggregated and identified, which revealed a shift in the liver tumor ablation anesthesia field. Initially, hotspots were predominantly "alcohol injection", "radiofrequency tissue ablation", and "metastases", but hotspots shifted to "efficacy", "ablation", "pain", "microwave ablation", "management", "analgesia", "safety", "irreversible electroporation", and "anesthesia" recently. CONCLUSIONS Anesthesia has received increased attention as liver tumor ablation advances. Bibliometric study findings provide insight into the current state and trends of anesthesia in liver tumor ablation research.

Microscopic derivation of Ginzburg-Landau theory and the BCS critical temperature shift in a weak homogeneous magnetic field

Starting from the Bardeen-Cooper-Schrieffer (BCS) free energy functional, we derive the Ginzburg-Landau functional in the presence of a weak homogeneous magnetic field. We also provide an asymptotic formula for the BCS critical temperature as a function of the magnetic field. This extends the previous works arXiv:1102.4001 and arXiv:1410.2352 of Frank, Hainzl, Seiringer and Solovej to the case of external magnetic fields with non-vanishing magnetic flux through the unit cell.

Increasing Social Work’s Stake in Interprofessional Practice

Integrated behavioral healthcare is becoming increasingly important and central to social work practice as the healthcare field shifts from a solely disease model of health to a more holistic approach. Researchers have also noted the need for studies demonstrating effective models for incorporating integrated healthcare training into schools of social work. Studies that demonstrate the effects of integrated training have the potential to provide legitimacy to these training programs, an important step in furthering their adoption within schools of social work in the United States and abroad. The training program described here was designed to increase the number of MSW social workers who provide trauma-informed, culturally relevant, evidence-based behavioral health prevention and intervention practices at integrated healthcare settings. This study used a pre- and post-survey design with non-participating MSW students as a control group. Findings indicate significant increases in knowledge, skills, and attitudes for training participants. A recommendation for further research is to explore to what extent graduates transfer their enhanced knowledge to the workplace.

Refined theoretical values of field and mass isotope shifts in thallium to extract charge radii of Tl isotopes.

Electronic factors for the field and mass isotope shifts in the 6p 2P3/2 → 7s 2S1/2 (535nm), 6p 2P1/2 → 6d 2D3/2 (277nm), and 6p 2P1/2 → 7s 2S1/2 (378nm) transitions in neutral thallium were calculated within the high-order relativistic coupled cluster approach. These factors were used to reinterpret previous experimental isotope shift measurements in terms of charge radii of a wide range of Tl isotopes. Good agreement between theoretical and experimental King-plot parameters was found for the 6p 2P3/2 → 7s 2S1/2 and 6p 2P1/2 → 6d 2D3/2 transitions. It was shown that the value of the specific mass shift factor for the 6p 2P3/2 → 7s 2S1/2 transition is not negligible compared with the value of normal mass shift in contrast to what had been suggested previously. Theoretical uncertainties in the mean square charge radii were estimated. They were substantially reduced compared with the previously ascribed ones and amounted to less than 2.6%. The achieved accuracy paves the way for a more reliable comparison of the charge radii trends in the lead region.

Surface plasmon resonance sensor composed of microstructured optical fibers for monitoring of external and internal environments in biological and environmental sensing

To achieve simultaneous detection of analytes with different states in internal and external environments, A microstructured optical fibers (MOFs) biochemical sensor based on surface plasmon resonance (SPR) is proposed. The micro-polished dual-open-loop structure with anti-corrosive gold as the sensing layer is designed, which greatly improves the phase matching between fundamental mode and plasmonic mode to further stimulate SPR effect. Numerical simulation by the full-vector finite element method (FEM) reveals that the even mode for y-polarized state has better sensing properties due to the more eminent electric field distribution and shift of the confinement loss peak. In order to better evaluate and analyze the output characteristics of this sensor, the wavelength modulation and amplitude interrogation methods are adopted. The results manifest that the maximum wavelength sensitivity (WS) of 20,000 nm/RIU and amplitude sensitivity (AS) of 208.21 RIU−1 with resolution (R) of 10−6 order can be acquired in operable infrared region (900–2,750 nm). Furthermore, this sensor has realized a broad range of detection for gas and liquid analytes with RIs from 1.00 to 1.38. On account of its simple structure, low cost, and industrial compatibility, this sensor has large potential in environmental and biological applications such as atmospheric monitoring, sewage treatment, food safety, humoral regulation, and medical diagnosis.

Formula omitted]-antisite disorder driven exchange bias effect and Griffiths-like phase in 25% Sr-doped [formula omitted

The unusual magnetic behaviour and multiple magnetic phases in double perovskite systems mainly originate from B-antisite disorder and various exchange couplings. Here we report the detailed exchange bias study in the hole doped Sm1.5Sr0.5CoMnO6 double perovskite system. The existence of structural antisite-disorder (Co-O-Co-O-Mn or Mn-O-Mn-O-Co) in the system is revealed. The ordering of Co2+ and Mn4+ gives rise to two ferromagnetic transitions, Tc1∼133 K and Tc2∼114 K. A Griffiths-like phase at ∼153 K is identified by the dc magnetization data above the ferromagnetic ordering temperature. The isothermal magnetization measurements further probe the exhibition of the conventional exchange bias effect and training effect phenomena in our sample. Maximum field shift ∼3.43 kOe in exchange bias effect is observed owing to the exchange couplings at the interfaces of FM/AFM at low temperature induced by B-antisite-disorder. In the 64–300 K temperature range, this disordered double perovskite exhibits insulating characteristics with a variable range hopping type of conduction mechanism. We also notice a negative magnetoresistance of −2.74% at 64 K and 60 kOe magnetic field.

Seasonal Meridional Displacement of the Jet Structure of the Antarctic Circumpolar Current South of Africa

This paper describes a method for analyzing the seasonal variability of the structure of the gradient field of Absolute Dynamic Topography (ADT) based on the satellite altimetry data. This structure is understood as the alternation in the meridional direction of the zones of increased values of the absolute values of the ADT gradient and the zones of their lower values, i.e. jets and inter-jet gaps. The technique uses linear and harmonic regression analyzes and makes it possible to calculate the amplitudes and phases of stationary harmonic oscillations that approximate the seasonal variations in the meridional shift of the structure of the ADT gradient field and in the absolute values of the ADT gradient, as well as to estimate the calculation error. Based on this technique, corresponding calculations were made for the Antarctic Circumpolar Current (ACC) band south of Africa (from 10 ° W to 25 ° E). In particular, the amplitude of the seasonal variation of the meridional shift of the ADT gradient field for the ACC as a whole was 0.009 ± 0.013° latitude with a maximum northward shift in December. At the same time, there are zones within the ACC band where this amplitude reaches 0.12°, 0.16° and 0.28° latitude. The amplitude of the shift of the indicated field relative to the scale of the ADT itself within the ACC band at different scales is 0.6–2.5 cm. It is shown that this shift is mainly due to the seasonal variation of the ADT at geographic points. The amplitude of the seasonal variation of the ADT gradient modulus relative to both latitude and the ADT scales increases from 1 × 10–3 cm/km in the central part of the ACC to 6–7 × 10–3 cm/km at the southern and northern peripheries.

Out-of-plane Ferromagnetic Resonance and Surface Spin Wave Modes in Ni80Fe20 Film on Ripple-Patterned Sapphire Substrate

The study of surface magnetic anisotropy of magnetic films is beneficial to understanding the behaviors of films at high frequencies and further promoting their high-frequency magnetic applications. We investigated the out-of-plane ferromagnetic resonance (FMR) and surface spin wave modes in 40-nm Ni80Fe20 (NiFe) films deposited on ripple-patterned sapphire substrate with periodicity and a flat sapphire substrate by broad-band FMR technique. When measuring the FMR of the film on ripple-patterned substrate, the in-plane angle (\U0001d711 H of the external applied magnetic field was along the direction of the ripples (\U0001d711 H = 90°) and perpendicular to the ripple direction (\U0001d711 H = 0°) respectively. The spin-wave resonance spectra consisting of up to two surface spin wave (SSW) modes were observed as the external magnetic field polar angle θH varied from “in-plane configuration” (θH = 90° ) to “out-of-plane configuration” (θH = 0°). As the decrease of θH , the two surface spin excitations disappeared in sequence and further only FMR mode was observed in the region θH which was smaller than the “critical angle” θc . The θc of \U0001d711 H = 90° is found to be different from that for \U0001d711 H = 0°. The dependences of field shift vs. out-of-plane angles θH for each SSW mode were analyzed by the surface inhomogeneity model. From the model, the surface anisotropy constants Ks of films were obtained. The results show that the values of surface anisotropy constants for the two SSW modes are different. Compared with the film sputtered on flat sapphire substrate, after introducing ripple-patterned substrate, the variation of Ks is only on the order of 0.01 erg/cm2 for the film of this thickness.

King-Plot Analysis of Isotope Shifts in Simple Diatomic Molecules

We demonstrate that the isotope shift in isotopomers of diatomic molecules, where the nucleus of one of its constituent atoms is replaced by another isotope, can be expressed as the sum of a field shift and a mass shift, similar to the atomic case. We show that a linear relation holds between atomic and molecular isotopes shifts, thus extending the King-plot analysis to molecular isotope shifts. Optical isotope shifts in YbF and ZrO and infrared isotope shifts in SnH are analyzed with a molecular King-plot approach, utilizing Yb$^{+}$ and Zr$^{+}$ ionic isotope shifts and charge radii of Sn obtained with non-optical methods. The changes in the mean-squared nuclear charge radii $\delta \langle r^2 \rangle$ of $^{170-174,176}$Yb and $^{90-92,94,96}$Zr extracted from the molecular transitions are found to be in excellent agreement with the values from the spectroscopy of Yb$^{+}$ and Zr$^{+}$, respectively. On the contrary, in the case of the vibrational-rotational transition in SnH, no sensitivity to the nuclear volume could be deduced within the experimental resolution, which makes it unsuitable for the extraction of nuclear charge radii but provides insights into the molecular electronic wave function not accessible via other methods. The new opportunities offered by the molecular King-plot analysis for research in nuclear structure and molecular physics are discussed.

Modeling the Composites for Magnetoelectric Microwave Devices.

Many studies of the ME effect have been carried out in the microwave range in connection with the possibility of creating new electronic devices. One of the main microwave ME effects is the FMR line shift in an electric field, and the purpose of this article is to compare the FMR line shift in the ME structure in an electric field for a number of ferromagnetic metals, their alloys, and YIG ferrite using various piezoelectrics. This article discusses the regimes when the bias field is directed along the main axes of the magnetic component, while, as is known, the observed effect is due only to deformation. As a result of the study, ME structures with maximum and minimum microwave ME effects were found. In addition, the "substrate effect" in the piezoelectric YIG-GGG structure is considered.

Big rip in shift-symmetric Kinetic Gravity Braiding theories

We revise the future fate of a group of scalar-tensor theories known as kinetic gravity braiding models. As it is well-known, these theories can safely drive the expansion of the universe towards a future de Sitter state if the corresponding Lagrangian is invariant under constant shifts in the scalar field. However, this is not the only possible future state of these shift-symmetric models as we show in this letter. In fact, future cosmic singularities characterized by a divergence of the energy density can also appear in this framework. We present an explicit example where a big rip singularity is the only possible future fate of the cosmos.

Mass-independent Sn isotope fractionation and radiogenic 115Sn in chondrites and terrestrial rocks

Tin has ten stable isotopes, providing the opportunity to investigate and discriminate nucleosynthetic isotope anomalies from mass-dependent and mass-independent isotope fractionation. Novel protocols for chemical separation (based on TBP-resin) and MC-ICP-MS analyses are reported here for high precision Sn isotope measurements on terrestrial rocks and chondrites. Relative to the Sn reference standard (NIST SRM 3161a), terrestrial basalts and chondrites show isotope patterns that are consistent with mass-dependent and mass-independent isotope fractionation processes as well as with 115Sn radiogenic ingrowth from 115In.Two different mass-independent isotope effects are identified, namely the nuclear volume (or nuclear field shift) and the magnetic isotope effect. The magnetic isotope effect dominates in the two measured ordinary chondrites, while repeated analyses of the carbonaceous chondrite Murchison (CM2) display a pattern consistent with a nuclear volume effect. Terrestrial basalts show patterns that are compatible with a mixture of nuclear volume and magnetic isotope effects. The ultimate origin of the isotope fractionation is unclear but a fractionation induced during sample preparation seems unlikely because different groups of chondrites show distinctly different patterns, hence pointing towards natural geo/cosmochemical processes. Only the carbonaceous chondrite Murchison (CM2) shows a Sn isotope pattern similar to what expected for nucleosynthetic variations. However, this pattern is better reproduced by nuclear volume effects. Thus, after considering mass-independent and mass-dependent effects, we find no evidence of residual nucleosynthetic anomalies, in agreement with observations for most other elements with similar half-mass condensation temperatures.Most chondrites show a deficit in 115Sn/120Sn (typically −150 to −200 ppm) relative to terrestrial samples, with the exception of one ordinary chondrite that displays an excess of about +250 ppm. The 115Sn/120Sn data correlate with In/Sn, being consistent with the β− decay of 115In over the age of the solar system. This represents the first evidence of the 115In-115Sn decay system in natural samples. The radiogenic 115Sn signature of the BSE derives from a suprachondritic In/SnBSE, which reflects preferential partitioning of Sn into the Earth’s core.

Time-Domain Numerical Simulation and Experimental Study on Pulsed Eddy Current Inspection of Tubing and Casing.

Fundamental theory and methods are investigated of inspecting tubing and casing simultaneously using pulsed eddy current testing by numerical simulations and experiments. The distribution and variation of eddy current field are given in the finite element simulation for the inspection of undamaged and corroded casing and tubing combinations, with tubing outer diameter 73.8 mm, wall thickness 5.7 mm, corrosion depth 1.25 mm, 2.5 mm, 3.75 mm, and casing outer diameter 141.5 mm, wall thickness 7.7 mm, corrosion depth 1.25 mm, 2.5 mm, and 3.75 mm, respectively. The results show that eddy current field propagates around and to the depth after the direct section of the exciting current is cut off and the intensity center of eddy current field shifts gradually from the inner side of the tubing to the casing, which forms the basis of analyzing inspection mechanism. Corrosion at a particular depth is related to a particular optimum time slice of the induced voltage (namely with deepest concave) and a highest sensitivity is obtained at this slice. The time associated with this slice is in accordance with the time when the intensity center of eddy current reaches the corrosion. Corrosion at different depths has different voltage time slices starting to show signal of defect, which can be used to estimate the depth of the defect in order to judge the defect coming from tubing or casing. Furthermore, sinking degree of the time slice reflects the size of the defect. All machined defects can be recognized in the experiments and the optimum time slice appears at 0.01 s and 0.008 s after the excitation current is cut off for the tubing corrosion of 1.25 mm and 2.5 mm, respectively. The optimum time slice appears at the last moment of cut-off period, 0.625, for the casing corrosion. Experimental results agree well with the simulations and show the existence of the optimum correspondence between depth of corrosion and starting time of the defect signal of time slice, relations between sinking degree of the time slice, and corrosion size.

Solution for the Problem of Sustainable Staff Scheduling in Semi-Automated Dock Container Terminals in Ports

Port operations in container terminals are as important as container transportation itself. A port has a complex system in which a wide variety of operations take place, and a wide variety of resources are required to interact with each other. The aim of a port operator is to complete the service required in the shortest time and in the most efficient way. The quayside of the port, the equipment used such as cranes and field vehicles, and the operations officer and personnel are factors that directly affect the service provided at a port. The port management aims to maximize efficiency by reaching the maximum number of movements with the least possible cost. Increasing the efficiency and quality of the working personnel is extremely important in achieving this aim. This study provides efficient, fair, and balanced scheduling of field personnel and shift supervisors working in port operations using a real-life case of the semi-automated docks at an international port. A goal-programing model is constructed to manage the workforce needed by the port for a one-week working period and to assign the shift supervisors to the shifts in a balanced way. The personnel’s preferences and qualifications, which directly affect productivity, are also considered while planning. Results show an increase in productivity, quality of life, concentration, and employee job satisfaction. The results of the suggested mathematical model in the study show that the demands of the workers facing conflicting constraints were met with the least deviation from goals.

Glassy magnetic freezing and exchange bias effect in NiCo2O4/(Co-Ni)O nanoparticles composite

An anomalous magnetic behavior and exchange bias effect are systematically studied for NiCo2O4/(Co-Ni)O nanoparticles synthesized by a microwave combustion method. Based on a complementary characterization by powder X-ray diffraction and high-resolution transmission electron microscopy, a composite of spinel Ni-cobaltite, NiCo2O4, and rock-salt-structured Co-Ni monoxide, (Co0.65Ni0.35)O, nanoparticles was synthesized in almost uniform elemental distribution. Optical absorbance measurements indicated multiple optical energy gaps with values of 2.02, 3.63 eV and 1.54, 4.015 eV attributed to the cobaltite and monoxide phases, respectively. A magnetic cluster-glass-like behavior with a blocking temperature of ∼ 75 K and irreversibility between the ZFC and FC magnetizations below ∼ 254 K were observed at low fields. An inherent exchange bias effect with significant shifts in both coercive field and remanent magnetization at temperatures up to room temperature is explored.

Demystifying Prognosis : Understanding the Science and Art of Prognostication.

The science of prognostication is emerging as a vital part of providing goal concordant patient care. Historically, modern medicine has tended to shy away from approaching prognostication as a core clinical skill, and prognosis as something to be shared directly with the patient. In recent years however, the medical field's shift towards a focus on patient autonomy and more openness in matters regarding end of life has propelled the study of prognostication into a more essential component of patient centered care. This calls for more emphasis on teaching the science of prognosis and the skill of prognostication as a core part of modern medical education. The following chapter aims to delve into the science of prognostication, explore the methods of formulating a prognosis, and discuss issues surrounding the communication of prognosis.

Nuclear volume isotope fractionation of europium and other lanthanide elements

The nuclear volume component of equilibrium field shift isotope fractionations in europium and other lanthanide elements is estimated using Mössbauer spectroscopy and electronic structure calculations. This effect goes in the opposite direction from equilibrium mass-dependent fractionation, and in the case of europium is predicted to dominate over mass dependent fractionation for most materials. Including both effects, Eu2+-bearing species will have approximately 0.4-1‰ higher 153Eu/151Eu than Eu3+-bearing species at 25ºC (298 K), and about 0.3‰ higher 153Eu/151Eu at 700ºC (973 K). Field shift fractionation mainly depends on oxidation state; differences in coordination structure without changes in oxidation state appear to have much weaker associated fractionations. Nuclear volume isotope fractionation will become even more dominant over mass dependent fractionation at higher temperatures because nuclear volume effects scale with 1/T (K), vs. 1/T2 for mass-dependent fractionation. Fractionation favoring high 153Eu/151Eu in minerals that preferentially incorporate Eu2+, such as plagioclase, is consistent with recent measurements on igneous rocks showing low 153Eu/151Eu in samples with large negative europium anomalies (Lee and Tanaka, 2021). The present results agree with the recent conclusion that equilibrium fractionation cannot explain cosmochemical REE fractionations in primitive meteoritical materials (Hu et al., 2021), because the net fractionation is too small (~0.2‰ or less) at temperatures >1200 K where vapor-phase REE species are relevant.

High-Precision Electrical Determination and Correction of Attitude Deviation for the Coil Vector Magnetometer

Coil vector magnetometer is an advanced instrument that can perform integrated multi-element geomagnetic measurements and has excellent prospects for geoscience research and resource exploration applications. The attitude deviation is one of the main error sources of magnetic direction measurements of the coil vector magnetometer. The existing attitude determination method requires the use of additional auxiliary instruments (e.g., a spirit level). Furthermore, this method cannot be used to perform direct determination of the directional shift of the bias field caused by attitude deviation, and the magnetism of the detection instrument inevitably introduces new measurement errors. Therefore, it is difficult to achieve high-precision attitude deviation correction. To address this issue, we propose a novel electrical method to enable direct, high-precision determination of the attitude deviation and the corresponding correction indicator for the coil vector magnetometer by using only a single rotation of the magnetometer and applying bias fields, thereby realizing comprehensive high-precision hard and soft corrections of the attitude deviation via indicator alignment without relying on auxiliary detection instruments. In addition, we developed a dedicated experimental platform and then validated both the practicality and the performance of the proposed method in a geomagnetic observatory. Comparative experimental results for two coil vector magnetometers indicate that when the correction indicator’s alignment inaccuracy is less than 1 nT, the magnetic direction measurement error caused by the attitude deviation can be less than 6′′.