mlsa-iai-msu-lab/ru_sci_bench_zho_cite_reranking huggingface dataset:
Energy-based dynamic parameter identification for Pasternak foundation model

Parameter identification of Pasternak foundation models (PFM) is never satisfactory, which discourages the application and popularization of PFM. In the present study, an energy-based model to predict the dynamic foundation coefficients was proposed using the vibration kinetic energy and potential energy of a Pasternak foundation-rigid plate system. On the basis of the Pasternak foundation, the relationship among the natural frequency, dynamic foundation coefficients, rigid plate configuration, and vibrating soil equivalent mass per unit area was considered. To obtain the natural frequencies of the Pasternak foundation-rigid plate system, dynamic tests were performed. Using two or more dynamic test results of various rigid plates on a foundation, a set of equations of dynamic foundation coefficients was set up to directly identify the foundation coefficients and equivalent mass per unit area of vibrating soil. The feasibility of the proposed method was verified by comparing it with the outdoor and indoor test results and finite element analysis results. When the proposed method is used to obtain the dynamic parameters, PFM can be generalized and applied more widely in engineering practice.
Seismic assessment of nature-inspired hexagrid lateral load-resisting system

This paper provides a general perspective of the seismic performance of a nature-inspired, honey-comb grid structural system, known as a hexagrid, under near-field ground motions. Seismic performance of this skeleton is then compared to that of a bundled-tube, as a conventional and efficient load-resisting system in order to provide a better perception of the seismic behavior of a hexagrid skeleton. Two 20-story buildings with bundled-tube and hexagrid skeleton were studied. Nonlinear behavior of the structures was investigated through 3-D finite element computer models and nonlinear time history analyses by subjecting the models to seven three-component records of scaled near-field ground motions. Distribution of peak inter story drift and corner beam-column joint rotations were calculated and compared. Results indicated that by replacing the exterior columns of the bundled-tube system with inclined beam-column elements of nature-inspired hexagons, lateral stiffness of the building increased and it would tolerate less deformations before global dynamic instability is reached. The presence of inclined columns in the hexagrid skeleton helped to concentrate local nonlinearities in ring beams rather than exterior columns.
A strategy for improving sinterability and electrical properties of gadolinium-doped ceria electrolyte using calcium oxide additive

In this study, Gd and Ca co-doped ceria electrolytes with the compositions of Ce_(0.8)Gd_(0.2-x)Ca_xO_(2-δ) (x = 0-0.08)were prepared by a novel gel-casting method.The effects of the addition of Ca on the phase compositions, sintering behavior, and electrical properties of samples were investigated.According to the scanning electron microscope results and relative density measurement results, it is found that the addition of particular quantity of CaO can promote the sintering densification with a uniform grain growth.When the sintering temperature is 1400°C, the sample with 6 mol% addition of Ca has the highest relative density, which reaches 98.5% of the theoretical density.The electrical properties testing results confirm that the electrical conductivity of the samples can be improved significantly by doping appropriate CaO content.The maximum conductivity of 0.082 S/cm can be obtained at 800 °C in the Ce_(0.8)Gd_(0.12)-Ca_(0.06)O_(1.87) sample.It suggests that CaO can be used as an effective sintering aid and a codopant on the optimization of electrical properties for ceria-based electrolytes.
Grain refinement of Mg-3Y alloy using Mg-10Al_2Y master alloy

The as-extruded Mg-10Al_2Y master alloy was chosen as a novel grain refiner for as-cast Mg-3Y alloy.Contrast samples of cast Mg-3Y alloy added with pure Al and Mg-Zr master alloy grain refiners were prepared under the same conditions.In this study,the influence of addition amounts of Al_2Y and holding time on grain refinement efficiency as well as tensile properties was investigated.And the grain refining ability of the Al_2Y particles was systematically evaluated in terms of the addition amounts,number density of the Al_2Y particles and holding time.The finest grains are achieved at 2 wt% Al_2Y addition amount,which corresponds to number density of the polygonal Al_2Y particles of 420-460 mm~(-2).The Mg-10Al_2Y master alloy has significant refinement performance and no refining recession occurs at the holding time within 60 min,or the settling time up to 180 min.Grain refinement and the second phase strengthening of uniformly distributed Al_2Y particles contribute to the simultaneous enhancement on both strength and elongation of Mg-3Y alloy.
Populating ~(229m)Th via two-photon electronic bridge mechanism

The isomer ~(229m)Th is the most promising candidate for clocks based on the nuclear transition because it has the lowest excitation energy of only 8.10 ± 0.17 eV.Various experiments and theories have focused on methods of triggering the transition between the ground state and isomeric state,among which the electronic bridge (EB) is one of the most efficient.In this paper,we propose a new electronic bridge mechanism via two-photon excitation based on quantum optics for a two-level nuclear quantum system.The long-lived 7s_(1/2) electronic shell state of ~(229m)Th~(3+),with a lifetime of approximately 0.6 s,is chosen as the initial state and the atomic shells (7s-10s) could be achieved as virtual states in a two-photon process.When the virtual states return to the initial state 7s_(1/2),there is a chance of triggering the nucleus ~(229)Th~(3+) to its isomeric state ~(229m)Th~(3+) via EB.Two lasers at moderate intensity ((10~(10)-10~(14))W/m~2),with photon energies near the optical range,are expected to populate the isomer at a saturated rate of approximately 10~9 s~(-1),which is much higher than that due to other mechanisms.We believe that this twophoton EB scheme can help in the development of nuclear clocks and deserves verification via a series of experiments with ordinary lasers in laboratories.
Self-assembled graphene oxide/polyethyleneimine films as high-performance quartz crystal microbalance humidity sensors

As humidity is one of the most widely demanded environmental parameters, the precision of its detection is significant. An advanced humidity sensor will improve the validity of the humidity monitoring system. In this study, a facile chemical layer-by-layer self-assembly (CLS) method was developed for fabricating graphene oxide (GO)/polyethyleneimine (PEI) multilayer films. Owing to the chemical bonding between the PEI and GO, and the intrinsic stickiness of the PEI, layered films with different numbers of layers were successfully prepared using the CLS method and confirmed through ultraviolet-visible (UV-Vis) spectroscopy and the mass loading of quartz crystal microbalance (QCM). Morphological measurements revealed that the roughness and thickness of the films increased exponentially with the number of bilayers. The GO/PEI films were deposited on QCM electrodes using the CLS method to produce the humidity sensors. The humidity measurement results showed a high sensitivity (37.84 Hz/%RH) and rapid response/recovery (< 5 s/8 s) of the optimal sensor, which was superior to that of recently developed QCM sensors.
Photocatalytic activity of perovskite SrTiO_3 catalysts doped with variable rare earth ions

In this work, 15 types of rare earth (Re) ions, including Y~(3+), La~(3+), Ce~(3+), Pr~(3+),Nd~(3+),Sm~(3+), Eu~(3+), Gd~(3+), Tb~(3+), Dy~(3+), Ho~(3+), Er~(3+), Tm~(3+),Yb~(3+) and Lu~(3+) doped perovskite SrTiO_3 powders were synthesized by solgel method. The influence of Re ions doping on the crystal structure, morphology and optical property as well as the photocatalytic activity for the photodegradation of rhodamine B (RhB) was investigated in detail when the synthesized Re ions doped SrTiO_3 powders were served as catalysts. The presented results revealed that the crystal structure is invariable, whereas the morphology and the optical bandgap are variable for the resultant SrTiO_3 powders when different Re ions were incorporated into the SrTiO_3 lattice. The relatedness between the morphology, optical property and photocatalytic activity of the synthesized SrTiO_3 catalysts doped with variable Re ions were analyzed deeply, providing an insight into the influence factors on the photocatalytic activity of catalysts.
The U-Pb Geochronology and Lu-Hf Isotope Compositions of Detrital Zircons from the Nanhua Group of the Longsheng Region,South China and their Implications for Pan-African Events

It is unclear whether the South China blocks have an affinity with continental Gondwana due to a lack of direct Pan-African magmatic and metamorphic features.In this study,we conducted U-Pb geochronological and Lu-Hf isotopic analyses for detrital zircons from a sandstone of the Chang'an Formation of the Nanhua Group in the Longsheng region of northern Guangxi,with the aim of constraining the timing of sedimentation and information as to its source,as well as seeking evidence for Pan-African events in the South China blocks.The results show that the ages of detrital zircons peaked at 654.7 ± 6.2 Ma,773.2 ± 4.1 Ma and 821.9 ± 6.5 Ma,with some at 920-870 Ma;the youngest age indicates the existence of the Pan-African thermal event.The εHf(t) and TDM2 values demonstrate that the study area has experienced three stages of crustal growth at 3.0-2.4 Ga,2.1-1.5 Ga and 1.3-0.9 Ga.With intensively distributed Neoproterozoic mafic-ultramafic and granitic plutons emplaced at 830-810 Ma along the southwestern section of the Jiangnan Orogenic Belt and positive εHf(t) values from a large group of zircon grains,it is proposed that the sediments of the Chang'an Formation (of Nanhua Group) were largely sourced from the southeastern margin of the Yangtze block.Comparison with the zircon age spectra of the Cathaysian block shows that about 79% of the Pan-African aged detrital zircon grains that have TDM2 = 1352-1031 Ma and εHf(t) = 3.68-8.79,were sourced from the recycled Grenvillian crust of the Cathaysian block,suggesting that the Cathaysian block had a close connection with Gondwana.
Framework and development of data-driven physics based model with application in dimensional accuracy prediction in pocket milling

In the manufacturing of thin wall components for aerospace industry, apart from the side wall contour error, the Remaining Bottom Thickness Error (RBTE) for the thin-wall pocket component (e.g. rocket shell) is of the same importance but overlooked in current research. If the RBTE reduces by 30%, the weight reduction of the entire component will reach up to tens of kilograms while improving the dynamic balance performance of the large component. Current RBTE control requires the off-process measurement of limited discrete points on the component bottom to provide the reference value for compensation. This leads to incompleteness in the remaining bottom thickness control and redundant measurement in manufacturing. In this paper, the framework of data-driven physics based model is proposed and developed for the real-time prediction of critical quality for large components, which enables accurate prediction and compensation of RBTE value for the thin wall components. The physics based model considers the primary root cause, in terms of tool deflection and clamping stiffness induced Axial Material Removal Thickness (AMRT) variation, for the RBTE formation. And to incorporate the dynamic and inherent coupling of the complicated manufacturing system, the multi-feature fusion and machine learning algorithm, i.e. kernel Principal Component Analysis (kPCA) and kernel Support Vector Regression (kSVR), are incorporated with the physics based model. Therefore, the proposed data-driven physics based model combines both process mechanism and the system disturbance to achieve better prediction accuracy. The final verification experiment is implemented to validate the effectiveness of the proposed method for dimensional accuracy prediction in pocket milling, and the prediction accuracy of AMRT achieves 0.014 mm and 0.019 mm for straight and corner milling, respectively.
Efficacy of Qingre Huayu Fang (清热化瘀方) on atherosclerotic vulnerable plaque in apolipoprotein E knockout mice:proteasome pathway involvement

OBJECTIVE:To investigate the efficacy and mechanism of the Qingre Huayu Fang (清热化瘀方) on atherosclerotic vulnerable plaque in apolipoprotein E (ApoE) knockout mice through the ubiquitin proteasome pathway.METHODS:Sixty 8-week-old C57BL/6J ApoE knockout mice were fed a high-fat for 12 weeks and randomly divided into four treatment groups (n = 15 each):high-fat control,bortezomib (a proteasome inhibitor),bortezomib combined with Qingre Huayu Fang,and Qingre Huayu Fang alone.Aortic sections were examined for plaque development,inflammatory cell infiltration,type Ⅰ/Ⅲ collagen expression and immunohistochemical staining of CD40L,nuclear factor-kappa B (NF-κB)/P65 and ubiquitin.RESULTS:Mice in the high-fat control group had obvious atherosclerosis,with increased aortic plaque area.The degree of atherosclerosis of the atherosclerotic plaque was reduced in all of the treatment groups that received bortezomib and/or Duzhong (Cortex Eucommiae) Qingre Huayu.The expression of NF-kB,CD40L and ubiquitin were all reduced in the group that received combination bortezomib + Qingre Huayu Fang.CONCLUSION:The Qingre Huayu Fang inhibited aortic atherosclerosis in mice through a mechanism that may involve inhibition of the ubiquitin proteasome pathway.
Hydrolyzed seawater pearl tablet modulates the immunity via attenuating Th1/Th2 imbalance in an immunosuppressed mouse model

OBJECTIVE:To investigate whether Hydrolyzed Seawater Pearl tablet (HSPT) could modulate the Th1/Th2 imbalance in an immunosuppressed mouse model with Th1 to Th2 shift induced by Cyclosporine A (CsA) which can be used in the clinical treatment of Th2 to Th1 shift diseases,and explore the possible mechanism for the adjuvant therapeutic efficacy of HSPT on recurrent respiratory infections (RRI) and acquired immune deficiency syndrome (AIDS).METHODS:The mice were randomly divided into six groups of five animals each,namely normal group,model group,lentinan polysaccharide tablet (LPT) group and three HPST treated groups.HPST treated groups were administered with HPST (0.51,1.02,2.04 g/kg) via intragastric gavage (i.g) for 30 consecutive days.LPT used as reference drug for positive control,LPT group was administered with LPT (8.2 mg/kg) for 30 consecutive days.Normal group and model group were received distilled water.The animals in model group,LPT group and HPST treated groups were injected intraperitoneally with CsA (50 mg/kg) to establish the immunosuppressed mice model with Th1 to Th2 shift on the 20th,22nd and 24th day,one hour after the administration of the respective treatment.Animals were sacrificed one hour after the last administration to collect blood and splenic tissue.The proportion of T cells including CD8 + and CD4 + T cells,Th1 and Th2 in peripheral blood of experimental mice were measured by flow cytometric.The protein level in serum and mRNA level in splenic tissue of experimental mice for interleukin (IL)-2,IL-12,interferon-γ (IFN-γ),IL-4,IL-6,IL-10 and IL-13 were measured by enzyme linked immunosorbent assay and fluorescence quantitative polymerase chain reaction respectively.RESULTS:HSPT elevated the proportion of T cells including both CD8+ and CD4+ T cells,in which the proportion of Th1 and Th2 cells increased,while the ratio of Th1/Th2 cells decreased in peripheral blood of the immunosuppressed mouse model with Th1 to Th2 shift induced by CsA.Furthermore,HSPT elevated both protein and mRNA level of Th1-type cytokines IL-2 and IFN-γ,while had no significant effect on protein and mRNA level of Th1-type cytokine IL-12 and Th2-type cytokines IL-4,IL-6,IL-10,IL- 13 in mouse model.CONCLUSION:Our findings suggest that HSPT can increase proportion of T cells including both CD8 + and CD4+ T cells and induce Th2 to Th1 shift in both cells and cytokines,which probably was the mechanism to account for the adjuvant therapeutic efficacy of HSPT on RRI and AIDS.
Enhanced electrode kinetics and electrochemical properties of low-cost NaFe_2PO_4(SO_4)_2 via Ca~(2+) doping as cathode material for sodium-ion batteries

In recent years, sodium-ion batteries (SIBs) have been considered as one of the most promising alternatives to lithium-ion batteries (LIBs). Here, a new Na-super-ionic conductor (NASICON) cathode material NaFe_2PO_4(SO_4)_2 is successfully prepared through solid state method for SIBs. While the poor electronic conductivity of iron-based materials results in its poor rate and cycle performance. Then the electrochemical is effectively promoting via Ca~(2+) doping. Na_(0.84)Ca_(0.08)Fe_2PO_4(SO_4)_2 have achieved considerable electrochemical properties. The first discharge specific capacity is 121.6mAh g~(–1) at 25mAg~(–1) with the voltage platform (∼3.1 V) corresponding to Fe~(2+/3+). After 100 cycles, the capacity retention is 55.1 %. The excellent electrochemical performance is caused by some Na+ is substituted by Ca~(2+) and leading to the fast sodium kinetics, which is well proved by the powder X-ray diffraction pattern and well corresponding to the galvanostatic intermittent titration technique and cyclic voltammetry testing result (the diffusivity values are around at 10~(–12) cm~2 s~(–1)).
Effect of transverse static magnetic field on radial microstructure of hypereutectic aluminum alloy during directional solidification

The effect of different scales thermoelectric magnetic convection (TEMC)on the radial solidification microstructure of hypereutectic Al alloy has been investigated under transverse static magnetic field during directional solidification, focusing on the formation of freckle.Our experimental and numerical simulation results indicate that the TEMC circulation at sample scale under transverse static magnetic field leads to the enrichment of solute Al on one side of the sample.The TEMC and the solute enrichment degree increase with the increase of magnetic field when the magnetic field increases to 0.5 T.The enrichment degree of solute elements under magnetic field is affected by temperature gradient and growth rate.The non-uniform distribution of solute Al in the radial direction of the sample results in the non-uniform distribution of primary dendrite arm spacing (PDAS).Moreover, the applied magnetic field can lead to freckle formation and its number increases with the increase of magnetic field.The change of freckle is consistent with the anisotropy TEMC caused by the anisotropy of primary dendrite or primary dendrite network under magnetic field.Finally, the mechanism of synergism effect of the anisotropy TEMC, the distribution of solute Al and the PDAS on freckle formation and evolution is studied during directional solidification under magnetic field.
Additive manufacturing of high entropy alloys:A practical review

The novel idea of alloying,which is based on the utilization of multiple principal elements in high concentrations,has created a novel class of promising materials called high entropy alloys (HEAs).So far,several HEAs with outstanding properties beyond those of conventional alloys have been discovered,and new superior high-entropy alloys are still expected to be developed in the future.However,the fabrication process of HEAs through conventional manufacturing techniques suffers from significant limitations due to the intrinsic requirements of HEAs.Additive manufacturing (AM),on the other hand,has provided new opportunities for fabricating geometrically complex HEAs with the possibility of in situ tailoring of their microstructure features.Considering the growing interest in AM of HEAs during most recent years,this review article aims at providing the state of the art in AM of HEAs.It describes the feedstock requirements for laser based AM techniques.Thereafter,a comprehensive picture of the current state of nearly all HEAs processed by laser metal deposition (LMD),selective laser melting (SLM) and selective electron beam melting (SEBM) is presented.Special attention is paid to the features of AM derived microstructures along with their outstanding properties and underlying mechanisms for various material processing combinations.The AM of interstitial solute hardening HEAs,HEA matrix composites as well as non-beam based AM of HEAs will also be addressed.The post-AM treatments and the strategies to fabricate defect-free HEAs are summarized.Finally,a conclusion of current state and future prospects of additive manufacturing of HEAs will be presented.
Electromagnetic wave absorption performance of Ti_2O_3 and vacancy enhancement effective bandwidth

The microwave absorption properties of Ti_2O_3 were systematically investigated.Experimental results indicate that Ti_2O_3 has microwave absorption performance with a minimum reflection loss value of-37.6 dB at 18.6 GHz and an effective absorption bandwidth (RL <-10 dB)of 2 GHz.Further, vacancy defects were introduced into Ti_2O_3 by carbothermal reduction.Interestingly, the effective absorption bandwidth of Ti_2O_3 with vacancy defects reach 3.2 GHz.First-principles calculations provide evidence that vacancy defects result in the changes of electric dipole state, leading to a wider effective absorption bandwidth.These results have significance in understanding the origin of electromagnetic phenomena and developing electromagnetic wave absorption materials.
Data-based flatness prediction and optimization in tandem cold rolling

In cold rolling process, the flatness actuator efficiency is the basis of the flatness control system. The precision of flatness is determined by the setpoints of flatness actuators. In the presence of modeling uncertainties and unmodeled nonlinearities in rolling process, it is difficult to obtain efficiency factors and setpoints of flatness actuators accurately. Based on the production data, a method to obtain the flatness actuator efficiency by using partial least square (PLS) combined with orthogonal signal correction (OSC) was adopted. Compared with the experiential method and principal component analysis method, the OSC–PLS method shows superior performance in obtaining the flatness actuator efficiency factors at the last stand. Furthermore, kernel partial least square combined with artificial neural network (KPLS–ANN) was proposed to predict the flatness values and optimize the setpoints of flatness actuators. Compared with KPLS or ANN, KPLS–ANN shows the best predictive ability. The root mean square error, mean absolute error and mean absolute percentage error are 0.51 IU, 0.34 IU and 0.09, respectively. After the setpoints of flatness actuators are optimized, KPLS–ANN shows better optimization ability. The result in an average flatness standard deviation is 2.22 IU, while the unoptimized value is 4.10 IU.
糖尿病周围神经病变整合诊治进展

2020年发表在BMJ的中国流行病学资料显示,目前中国成人糖尿病的患病率已高达12.8%。而伴随而来的糖尿病慢性并发症严重影响国民的健康。其中糖尿病周围神经病变(diabetic peripheral neuropathy,DPN)是常见的糖尿病慢性并发症之一,临床以远端对称性多发性感觉运动神经病变最为常见,其病理特点为大、小神经纤维的进行性神经缺失,其中又以小纤维神经损伤为最多见[2]。本病大多起病隐匿,早期多无明显症状,而当出现严重临床症状时,神经损害常常难以逆转,甚至会引起糖尿病足等严重并发症[3]。因此早期发现DPN患者的神经功能紊乱并及时进行干预至关重要。
多发性骨髓瘤医源性颅内种植转移一例并文献复习

多发性骨髓瘤(MM)作为血液系统恶性肿瘤,中枢神经系统(CNS)浸润较为少见,医源性转移更为罕见。2020年6月浙江省诸暨市人民医院神经外科诊治1例医源性颅内种植转移的MM患者。患者4年前确诊MM,行多重化疗。1年前患者因腰椎增强MRI结果显示骶、尾髓及马尾弥漫多发结节状异常强化灶,考虑"MM CNS转移”,行Ommaya置管,后Ommaya管堵塞,头颅MRI结果显示右侧额叶占位,沿引流管走行,包绕引流管生长。探查术中见右侧额叶深部“胶冻样”占位,完整切除肿瘤。术后病理学检查结果证实为右侧额叶浆细胞骨髓瘤。随访3个月时患者因原发病复发死亡。
针康法对脑缺血小鼠血清中白细胞介素-6、白细胞介素-10含量的影响

目的:本研究旨在观察小鼠脑缺血后脑损伤功能恢复和炎性因子产物的病理变化,观察针康法对脑缺血小鼠血清炎性因子标志物白细胞介素-6(IL-6)、白细胞介素-10(IL-10)含量的影响。探讨针康法调控缺血性脑血管病炎性因子释放的神经保护作用。方法:9只小鼠作为假手术组,36只采用线栓法建立局灶性脑缺血模型后随机分为模型组、针刺组、康复组及针康组。针刺组术后24h予头穴丛刺治疗,康复组术后24h予跑台训练,针康组术后24h予跑台+循序渐进电动跑台训练,一次/天,共14天。于脑缺血后3d、7d、14d进行神经功能评分,酶联免疫吸附法检测血清IL-6及IL-10的水平。结果:与假手术组相比,模型组血清IL-6、IL-10水平均显著上升(P<0.05)。与模型组相比,针康组血清IL-6、IL-10水平均显著下降(P<0.05), mNSS评分降低(P<0.05)。结论:针康法能够下调小鼠脑缺血后血清中IL-6、IL-10水平,其机制可能与降低炎症因子表达水平有关。