mlsa-iai-msu-lab/ru_sci_bench_zho_cite_reranking huggingface dataset:
Carbon deposition in porous nickel/yttria-stabilized zirconia anode under methane atmosphere

A commercial solid oxide fuel cell with a Ni/YSZ anode was characterized under a pure methane atmosphere. The amount of deposited carbon increased with an increase in temperature but decreased when the temperature exceeded 700°C. The reactivity of carbon decreased with increasing deposition temperature. Filamentous carbon was deposited from 400 to 600°C, whereas flake carbon was deposited at 700 and 800°C. With increasing temperature, the intensity ratio of the D band over the sum of the G and D bands was constant at the beginning and then decreased with the transformation of the carbon morphology. The crystallite size increased from 2.9 to 13 nm with increasing temperature. The results also indicated that the structure of the deposited carbon was better ordered with increasing deposition temperature. In comparison with pure Ni powders, the interaction between the YSZ substrate and Ni particles could not only modify the carbon deposition kinetics but also reduce the temperature effect on the structure and reactivity variation of carbon.
Post-Mortem MRI and Histopathology in Neurologic Disease:A Translational Approach

In this review,combined post-mortem brain magnetic resonance imaging (MRI) and histology studies are highlighted,illustrating the relevance of translational approaches to define novel MRI signatures of neuropathological lesions in neuroinflammatory and neurodegenerative disorders.Initial studies combining post-mortem MRI and histology have validated various MRI sequences,assessing their sensitivity and specificity as diagnostic biomarkers in neurologic disease.More recent studies have focused on defining new radiological (bio)markers and implementing them in the clinical (research) setting.By combining neurological and neuroanatomical expertise with radiological development and pathological validation,a cycle emerges that allows for the discovery of novel MRI biomarkers to be implemented in vivo.Examples of this cycle are presented for multiple sclerosis,Alzheimer’s disease,Parkinson’s disease,and traumatic brain injury.Some applications have been shown to be successful,while others require further validation.In conclusion,there is much to explore with post-mortem MRI and histology studies,which can eventually be of high relevance for clinical practice.
Quantized Hybrid Precoding Design for Millimeter- Wave Large-Scale MIMO Systems

Millimeter wave (mmWave) and large-scale multiple input multiple output (MIMO) are two emerging technologies in fifth-generation wireless communication systems. The power consumption and hardware cost of radio frequency (RF) chains increase exponentially with the bit resolution of analog- to-digital converters (ADCs) and digital- to-analog converters (DACs). One promising solution is to employ few RF chains with low-bit ADCs and DACs. In this paper, we consider mmWave large-scale MIMO systems with low bits DACs and ADCs. Leveraging on the Bussgang theorem and the additive quantization noise model (AQNM), a closed-form expression of the achievable rate is derived to show the effect of the ADCs՚ and DACs՚ resolution. Moreover, an orthogonal matching pursuit (OMP) based hybrid precoding algorithm is proposed to increase the achievable rate. Our results show that the impact of DACs is more pronounced than the impact of ADCs. Furthermore, 5-bit ADCs and DACs are sufficient at the transceiver to operate without a significant performance loss.
Effect of 1070 nm laser intensity on parameters of In_(0.3)Ga_(0.7)As solar cell

The photoelectric properties of In_(0.3)Ga_(0.7)As solar cells applied in laser wireless power transmission (LWPT) were studied when they were irradiated by 1070 nm continuous wave (CW) laser of various intensities. The influences of laser intensity on solar cell parameters extracted by the pollination algorithm were analyzed quantitatively. Results show that the conversion efficiency of the cell rose to the maximum and then decreased rapidly in the laser intensity range of 50–900 mW/cm~2. With higher energy laser irradiation, the rise of ideality factor and reverse saturation current would lead to the degradation of voltage at the maximum power point, which was the main reason for the decrease of conversion efficiency. The results provide the basis for choosing the appropriate input energy in the case of different transmission systems.
Dysregulation of miR-135a-5p promotes the development of rat pulmonary arterial hypertension in vivo and in vitro

Pulmonary arterial hypertension(PAH)is the most common form of pulmonary hypertension. Pulmonary arterial remodeling is closely related to the abnormal proliferation of pulmonary artery smooth muscle cells(PASMCs), which leads to the thickening of the medial layer of muscular arteries and then results in the narrowing or occlusion of the precapillary arterioles and PAH. However, the mechanisms underlying the abnormal proliferation of PASMCs remain unclear. In this study, we established rat primary PAH models using monocrotaline(MCT)injection or hypoxic exposure, then investigated the expression patterns of seven miRNAs associated with multiple pathogenic pathways central to pulmonary hypertension, and further explored the roles and the possible mechanisms of miR-135a during the development of PAH. In the rat primary PAH models, we observed that the expression of miR-135a-5p in lungs was drastically decreased at the initial stage of PAH development after MCT administration or hypoxic exposure, but it increased by 12-fold or 10-fold at the later stage. In vitro study in PASMCs showed a similar pattern of miR-135a-5p expression, with downregulation at 6 h but upregulation at 18, 24, and 48 h after hypoxic exposure. Early, but not late, administration of a miR-135a-5p mimic inhibited hypoxia-induced proliferation of PASMCs. The protective role of early miR-135a-5p agomir in the PAH rat model further supported the hypothesis that the early decrease in the expression of miR-135a-5p contributes to the proliferation of PASMCs and development of PAH, as early administration of miR-135a-5p agomir(10 nM, i.v.)reversed the elevated mean pulmonary arterial pressure and pulmonary vascular remodeling in MCT-treated rats. We revealed that miR-135a-5p directly bound to the 3'-UTR sequence of rat transient receptor potential channel 1(TRPC1)mRNA and decreased TRPC1 protein expression, thus inhibiting PASMC proliferation. Collectively, our data suggest that dysregulation of miR-135a-5p in PASMCs contributes to the abnormal proliferation of PASMCs and the pathogenesis of PAH. Increasing miR-135a-5p expression at the early stage of PAH is a potential new avenue to prevent PAH development.
Scattering and reflection of SH waves around a slope on an elastic wedged space

The scattering and reflection of SH waves by a slope on an elastic wedged space is investigated. A series solution is obtained by using the wave function expansion method. The slope on a wedged space is divided into two subregions by an artificial, auxiliary circular arc. The wave fields with unknown complex coefficients within each sub-region are derived. Applying Graf addition theorem, the scattered waves in the sub-regions are expressed in a global coordinate system. Fourier transform is adopted to derive a consistent form of standing waves in the inner region using the orthogonality of the cosine functions. The boundary-valued problem is solved by stress and displacement continuity along the artificial, auxiliary arc to obtain the unknown complex coefficients. Parametric studies are next performed to investigate how the topography from the slope on the wedged space will affect the scattering and diffraction, and hence the amplification and de-amplification of the SH waves. Numerical results show that the surface motions on the slope of the wedged space is influenced greatly by the topography. Amplification of the surface motions near the slope vertex is significant. The corresponding phases along the wedged space surfaces are consistent with the direction that the SH waves are propagating.
Characterization of Corrosion Behavior of Irradiated X65 Low Carbon Steel in Aerobic and Unsaturated Gaomiaozi Bentonite

2.98 kGy/h (1007 h) gamma irradiation and 90 ℃ (2000 h) thermal aging were exerted to X65 grade low carbon steel buried in Gaomiaozi bentonite containing 17 wt %Beishan groundwater. The average corrosion rate of X65 low carbon steel was measured. The elemental and phase distribution on cross section was characterized by using electron probe micro-analysis, high-resolution X-ray diffraction, and micro-X-ray diffraction. The following conclusions can be made: the average aerobic corrosion rate of the carbon steel is (45.16 ± 1.53) lm/year. Taking the original surface as boundary, the corrosion scale is divided into an internal dense product layer (DPL) mainly composed of Fe_3O_4 with segregated FeCO_3 at the corrosion front and an external DPL mainly composed of Fe_3O_4 with segregated α-Fe_2O_3 and bentonite at some relics. Si, S, and Cl are concentrated at the corrosion front of the internal DPL, while Si and Al are concentrated at the external DPL.
A novel inexpensive conductive material: Er-modified maifanite by gaseous penetration technology

Aiming to solve the problem of corrosion and high cost of the conductive fillers, the powders with the properties of anti-oxidation, corrosion resistance and thermal stability should be developed. A new modification technology, rare earth gaseous penetration, was applied to enhance the conductivity of maifanite in this paper, and the mechanism for improving the conductivity of maifanite effectively was speculated in detail for the variations of the composition, structure and morphology between the original and Er-penetration maifanite powders. The results of the resistivity show that Er-penetration can really improve the conductivity of maifanite powders. When the penetration temperature is 500 ℃, the resistivity of maifanite surprisingly declines to 93.2 U·m. Moreover, XRD and XPS patterns display that the cations in maifanite are substituted by Er~(3+) successfully, resulting in the production of electrons in the system, which is the key reason to heighten the conductivity of maifanite. Most importantly, Erpenetration maifanite, whose price is really low, can replace the expensive conductive powders and be used in the electronic industry to decrease the cost of the electronic devices.
Anisotropic corrosion behavior of sintered (Ce_(0.15)Nd_(0.85))_(30)Fe_(bal)B permanent magnets

In this work, the corrosion behavior of the surface parallel to the oriented c-axis (ck) and perpendicular to c-axis (c⊥) in the (Ce_(0.15)Nd_(0.85))_(30)Fe_(bal)B dual main phase magnet was studied. With the addition of Ce, the volume fraction of RE-rich phase shown in the backscattered electron (BSE) images is basically approximate on the two surfaces. The free corrosion potential (E_(corr)) of the ck surface is more negative, which shows the worse corrosion resistance from the perspective of thermodynamics. While the reaction kinetics parameters with the smaller free corrosion current (i_(corr)) and the larger transfer resistance (Rct) react the opposite conclusion in 3.5 wt %NaCl solution. Moreover, the ck surface performs smaller ions concentration of corrosion product and less damaged corrosion morphology compared to c⊥ surface after the free corrosion. The inconformity is not affected by the RE-rich phase, but by the anisotropy of the grains that the ck surface has larger density of the atoms and the lower ratio of (Nd, Ce)/Fe.
GE Vectra 0.5T磁共振射频线圈故障检修

总结要注意对线圈保养和维护,多检查线圈缆线接口,线圈在搬动时要小心轻放,注意线缆不能弯曲折叠。使用过程中维护人员应充分利用报错信息,查阅相关维修资料,检修时胆大心细,逐步排除。尤其是结构原理相对简单的线圈故障,尽可能自行修复,这样节约了时间和资金,更好地为临床与患者服务。
Deterioration behavior of c-Si solar cell decorated with silver nanoparticles

Silver nanoparticles (AgNPs) with well-distributed sizes were prepared by magnetron sputtering on slides and crystalline silicon (c-Si) solar cell following by annealing at different temperatures.The morphologies,optical and photovoltaic performance were investigated in detail.The spectroscopic result shows that two resonance peaks resulting from coupling effect among neighboring particles are difficult to obtain by other chemical methods.The photovoltaic performances reveal that the solar cells decorated with AgNPs significantly are degraded,including a maximal decrease of 20.4 % in short-circuit density and 53.9 % in energy conversion efficiency.The lowest efficiency achieved is 5.85 % for c-Si solar cells with AgNPs annealed at 500 ℃.The deterioration should result from the synergetic effect of the intrinsic absorption of single particle and coupling absorption between neighboring particles.
Study on Energy Spectrum Instability in the Processes of Propagating and Breaking of Focusing Waves

Based on phase focusing theory, focusing waves with different spectral types and breaking severities were generated in a wave flume. The time series of surface elevation fluctuation along the flume were obtained by utilizing 22 wave probes mounted along the mid-stream of the flume. Based on the wave spectrum obtained using fast Fourier transform (FFT), the instability characteristics of the energy spectrum were reported in this paper. By analyzing the variation of total spectral energy, the total spectral energy after wave breaking was found to clearly decrease, and the loss value and ratio gradually increased and tended to stabilize with the enhancement of breaking severity for different spectral types. When wave breaking occurred, the energy loss was primarily in a high-frequency range of f/f_p>1.0, and energy gain was primarily in a low-frequency range of f/f_p<1.0. As the breaking severity increased, the energy gain-loss ratio decreased gradually, which demonstrates that the energy was mostly dissipated. For plunging waves, the energy gain-loss ratio reached 24% for the constant wave steepness (CWS) spectrum, and was slightly larger at approximately 30% for the constant wave amplitude (CWA) spectrum, and was the largest at approximately 42% for the Pierson-Moskowitz (PM) spectrum.
Two-Layer Non-Hydrostatic Model for Generation and Propagation of Interfacial Waves

When pycnocline thickness of ocean density is relatively small, density stratification can be well represented as a two-layer system. In this article, a depth integrated model of the two-layer fluid with constant density is considered, and a variant of the edge-based non-hydrostatic numerical scheme is formulated. The resulting scheme is very efficient since it resolves the vertical fluid depth only in two layers. Despite using just two layers, the numerical dispersion is shown to agree with the analytical dispersion curves over a wide range of kd, where k is the wave number and d the water depth. The scheme was tested by simulating an interfacial solitary wave propagating over a flat bottom, as well as over a bottom step. On a laboratory scale, the formation of an interfacial wave is simulated, which also shows the interaction of wave with a triangular bathymetry. Then, a case study using the Lombok Strait topography is discussed, and the results show the development of an interfacial wave due to a strong current passing through a sill.
Spectral measurements of hypervelocity flow in an expansion tunnel

Atmospheric reentry vehicles and planetary probes fly through the atmosphere at hypervelocity speed. At such speed, there is a significant proportion of heat load to the vehicle surface due to radiative heating. Accurate prediction needs a good knowledge of the radiation spectrum properties. In this paper, a high-speed camera and spectrograph coupled to an intensified charge-coupled device have been implemented to investigate the radiation flow over a semi-cylinder model. The experiments were carried out in the JF16 expansion tunnel with secondary shock velocity of 7.9 km·s~(-1). Results show that the emission spectrum comprises several atomic lines and molecular band systems.We give detailed data of the radiation spectrum, shock shape, shock detached distance and radiation intensity varying with space and wavelength. This valuable experimental dataset will be helpful to validate computational fluid dynamics codes and radiation models, which equates to increased prediction accuracy of radiation heating. Also, some suggestions for spectral measurement in hypervelocity flow field were list in the end.
医用导光检测仪的制作及在管腔器械清洗质量检查中的应用

目的探讨自制医用导光检测仪在管腔器械清洗质量检查中的应用效果。方法选用2017年5月-2018年5月手术室使用后的10 800件管腔器械作为实验组,2016年5月-2017年3月手术室使用后的9 000件管腔器械作为对照组,两组均采用手工清洗加全自动喷淋清洗消毒机清洗。实验组采用自制的医用导光检测仪进行清洗后的质量检查,对照组采用传统的纯棉白通条检查法。比较两组检查方法的适用范围、管腔器械清洗不合格检出率及临床使用合格率。结果实验组适用于各类型管腔器械清洗质量检查,对照组适用于直径≥3 mm、两端开口的管腔器械清洗质量检查;实验组清洗质量不合格检出率(8.45%)远高于对照组(2.02%),实验组临床使用合格率(100%)高于对照组(99.89%),两组比较,差异均有统计学意义(P<0.01)。结论自制医用导光检测仪提高了管腔器械清洗检查质量,且操作简单,适用范围广,制作成本低。
RADIAL CONVEX SOLUTIONS OF A SINGULAR DIRICHLET PROBLEM WITH THE MEAN CURVATURE OPERATOR IN MINKOWSKI SPACE

In this paper, we study the existence of nontrivial radial convex solutions of a singular Dirichlet problem involving the mean curvature operator in Minkowski space. The proof is based on a well-known fixed point theorem in cones. We deal with more general nonlinear term than those in the literature.
The 4th Asian Conference on Geography held successfully in Guangzhou & the Asian Geographical Association formally established

Under the auspices of the Geographical Society of China and Sun Yat-sen University, the 4th Asian Conference on Geography was held from December 6th-10th, 2018 in Guangzhou, China. Under the theme of “Rising Asia and Our Geography”, the conference attracted over 500 participants from 27 countries(regions) worldwide, including 21 from Asia.
The mechanism of farmland marginalization in Chinese mountainous areas: Evidence from cost and return changes

Farmland marginalization has become the main trend of land-use change in the mountainous areas of China. Using annual survey data of major agricultural production costs and earnings at national and provincial levels in China, this study aims to analyze the reasons and mechanism behind farmland marginalization in mountainous areas. We find that farmers on plains are able to reduce their per mu labor input effectively through intensive use of agricultural machinery, which has minimized the impact of the increase in labor price. However, it is extremely challenging for farmers in mountainous areas to use the same method owing to the rough terrain. Thus, per laborer farming area in these areas has increased relatively slowly, causing a widening gap in agricultural labor productivity between the two regions. With the rapid rise in labor costs since 2003, the marginalization of cultivated land in mountainous areas is evident. In 2013, the net profit of agricultural production in mountainous China fell below zero. Since 2000, the land-use and land-cover change in these areas was characterized by the reduction of farmland area, reforestation, and the enhancement of the NDVI value. The high correlation between the NDVI change rate and the ratio of change in farmland (r = –0.70) and forest (r = 0.91) in mountainous areas at provincial level further attests to the trend of farmland marginalization there. Finally, we summarize the mechanism of such marginalization against the backdrop of the rapid increase in the opportunity cost of farming and the rapid fall of agricultural labor forces in mountainous areas. This study contributes to a deep understanding of the development process of farmland marginalization and abandonment as well as forest transition in Chinese mountainous areas.
Changes in air temperature over China in response to the recent global warming hiatus

The 1998–2012 global warming hiatus has aroused great public interest over the past several years. Based on the air temperature measurements from 622 meteorological stations in China, the temperature response to the global warming hiatus was analyzed at national and regional scales. We found that air temperature changed –0.221℃/10a during 1998–2012, which was lower than the long-term trend for 1960–1998 by 0.427℃/10a. Therefore, the warming hiatus in China was more pronounced than the global mean. Winter played a dominant role in the nationwide warming hiatus, contributing 74.13%, while summer contributed the least among the four seasons. Furthermore, the warming hiatus was spatial heterogeneous across different climate conditions in China. Comparing the three geographic zones, the monsoon region of eastern China, arid region of northwestern China, and high frigid region of the Tibetan Plateau, there was significant cooling in eastern and northwestern China. In eastern China, which contributed 53.79%, the trend magnitudes were 0.896℃/10a in winter and 0.134℃/10a in summer. In the Tibetan Plateau, air temperature increased by 0.204℃/10a, indicating a lack of a significant warming hiatus. More broadly, the warming hiatus in China may have been associated with the negative phase of PDO and reduction in sunspot numbers and total solar radiation. Finally, although a warming hiatus occurred in China from 1998 to 2012, air temperature rapidly increased after 2012 and will likely to continuously warm in the next few years.
The law of barrel wear and its application

A power function relation between number of rounds and barrel wear amount is created based on the test data from firing of large-caliber barrels. The function is optimized to fully fit the test data. A new concept of diameter change rate of bore is proposed and the law of barrel wear is put forward by means of comparing the diameter change rates for large-caliber barrels with different calibers. It is shown that the law of barrel wear is successful in barrel life prediction.
Tape nanolithography: a rapid and simple method for fabricating flexible, wearable nanophotonic devices

This paper describes a tape nanolithography method for the rapid and economical manufacturing of flexible, wearable nanophotonic devices. This method involves the soft lithography of a donor substrate with air-void nanopatterns, subsequent deposition of materials onto the substrate surface, followed by direct taping and peeling of the deposited materials by an adhesive tape. Without using any sophisticated techniques, the nanopatterns, which are preformed on the surface of the donor substrate, automatically emerge in the deposited materials. The nanopatterns can then be transferred to the tape surface. By leveraging the works of adhesion at the interfaces of the donor substrate-deposited material-tape assembly, this method not only demonstrates sub-hundred-nanometer resolution in the transferred nanopatterns on an area of multiple square inches but also exhibits high versatility and flexibility for configuring the shapes, dimensions, and material compositions of tape-supported nanopatterns to tune their optical properties. After the tape transfer, the materials that remain at the bottom of the air-void nanopatterns on the donor substrate exhibit shapes complementary to the transferred nanopatterns on the tape surface but maintain the same composition, thus also acting as functional nanophotonic structures. Using tape nanolithography, we demonstrate several tapesupported plasmonic, dielectric, and metallo-dielectric nanostructures, as well as several devices such as refractive index sensors, conformable plasmonic surfaces, and Fabry-Perot cavity resonators. Further, we demonstrate tape nanolithography-assisted manufacturing of a standalone plasmonic nanohole film and its transfer to unconventional substrates such as a cleaved facet and the curved side of an optical fiber.