mlsa-iai-msu-lab/ru_sci_bench_zho_cite_reranking huggingface dataset:
Aiding and opposing mixed convection flows over the Riga-plate

The Blasius flow of an electrically conducting fluid over the Riga-plate is considered. The Riga-plate is an electromagnetic actuator which consists of a spanwise aligned array of alternating electrodes and permanent magnets mounted on a plane surface. This array generates a surface-parallel Lorentz force which decreases exponentially in the direction normal to the plate. The governing parameter of the title problem is the modified Hartmann number Z, which is positive when the Lorentz points in the direction of the free stream (aiding flow) and negative when it is opposite to the free stream (opposing flow). The characteristics of physical and engineering interest of these doubly driven aiding and opposing mixed convection flows are discussed in the paper in detail.
Genetic algorithm and M-estimator based robust sequential estimation of parameters of nonlinear sinusoidal signals

Estimation of parameters of nonlinear superimposed sinusoidal signals is an important problem in digital signal processing. In this paper, we consider the problem of estimation of parameters of real valued sinusoidal signals. We propose a real-coded genetic algorithm based robust sequential estimation procedure for estimation of signal parameters. The proposed sequential method is based on elitist generational genetic algorithm and robust M-estimation techniques. The method is particularly useful when there is a large number of superimposed sinusoidal components present in the observed signal and is robust with respect to presence of outliers in the data and impulsive heavy tail noise distributions. Simulations studies and real life signal analysis are performed to ascertain the performance of the proposed sequential procedure. It is observed that the proposed methods perform better than the usual non-robust methods of estimation.
Center conditions and bifurcation of limit cycles at three-order nilpotent critical point in a seventh degree Lyapunov system

In this paper, center conditions and bifurcation of limit cycles at the nilpotent critical point in a class of seventh degree system are investigated. With the help of computer algebra system MATHEMATICA, the first 12 quasi Lyapunov constants are deduced. As a result, sufficient and necessary conditions in order to have a center are obtained. The fact that there exist 12 small amplitude limit cycles created from the three order nilpotent critical point is also proved. Henceforth we give a lower bound of cyclicity of three-order nilpotent critical point for seventh degree Lyapunov systems.
Mathematical theory of physical vacuum

This article sets out mathematical basics of unifying fundamental physical theory, with a single postulate of nonvoid physical vacuum. It will be shown that all basic equations of classical electrodynamics, quantum mechanics and gravitation theory could be derived from two nonlinear equations, which define dynamics of physical vacuum in three-dimensional Euclidean space and, in turn, are derived from equations of Newtonian mechanics. Through the characteristics of physical vacuum, namely its density and propagation velocity of various density’s perturbations, such principal physical conceptions as matter and antimatter, electric, magnetic and gravitational fields, velocity of light, electron, photon and other elementary particles, internal energy, mass, charge, spin, quantum properties, Planck constant and fine structure constant will have clear and sane definitions.
Convergence analysis for numerical solution of Fredholm integral equation by Sinc approximation

In this study one of the new techniques is used to solve numerical problems involving integral equations known as Sinc-collocation method. This method has been shown to be a powerful numerical tool for finding accurate solutions. So, in this article, some properties of the Sinc-collocation method required for our subsequent development are given and are utilized to reduce integral equation of the first kind to some algebraic equations. Then by a theorem we show error in the approximation of the solution decays at an exponential rate. Finally, numerical examples are included to demonstrate the validity and applicability of the technique.
Computed torque control of an under-actuated service robot platform modeled by natural coordinates

The paper investigates the motion planning of a suspended service robot platform equipped with ducted fan actuators. The platform consists of an RRT robot and a cable suspended swinging actuator that form a subsequent parallel kinematic chain and it is equipped with ducted fan actuators. In spite of the complementary ducted fan actuators, the system is under-actuated. The method of computed torques is applied to control the motion of the robot. The under-actuated systems have less control inputs than degrees of freedom. We assume that the investigated under-actuated system has desired outputs of the same number as inputs. In spite of the fact that the inverse dynamical calculation leads to the solution of a system of differential–algebraic equations (DAE), the desired control inputs can be determined uniquely by the method of computed torques. We use natural (Cartesian) coordinates to describe the configuration of the robot, while a set of algebraic equations represents the geometric constraints. In this modeling approach the mathematical model of the dynamical system itself is also a DAE. The paper discusses the inverse dynamics problem of the complex hybrid robotic system. The results include the desired actuator forces as well as the nominal coordinates corresponding to the desired motion of the carried payload. The method of computed torque control with a PD controller is applied to under-actuated systems described by natural coordinates, while the inverse dynamics is solved via the backward Euler discretization of the DAE system for which a general formalism is proposed. The results are compared with the closed form results obtained by simplified models of the system. Numerical simulation and experiments demonstrate the applicability of the presented concepts.
Bifurcations and fast-slow behaviors in a hyperchaotic dynamical system

This paper reports a four-dimension (4D) fast-slow hyperchaotic system with the structure of two time scales by adding a slow state variable w into a three-dimension (3D) chaotic dynamical system, studies the stability and Hopf bifurcation of origin point. Furthermore, based on the fast-slow dynamical bifurcation analysis and the phase planes analysis, different bursting phenomena, symmetric fold/fold bursting, symmetric sub-Hopf/sub-Hopf bursting and chaotic bursting, as well as chaotic and periodic spiking, are observed in the fast-slow hyperchaotic system. Numerical simulations are presented to show these results.
Numerical study of pattern formation in an extended Gray–Scott model

We present the temporal evolution of noise-controlled patterns in a spatially extended Gray–Scott model firstly. We show that the model exhibits a transition from stripe-spot growth to isolated spots, and also to spiral replication. Furthermore, we establish an extended Gray–Scott model with time-varying diffusivity, and find that the patterns exhibit transition from stripe-spot growth to stripe-spot or chaos replication. Additional studies reveal that with noise and time-varying diffusivity together, a new time-dependent pattern—a few of stripes oscillate in the “red” region—emerges, which hasn’t been reported before.
A note on solutions of the Korteweg–de Vries hierarchy

olutions of the Korteweg–de Vries hierarchy are discussed. It is shown that results by Wazwaz [Wazwaz AM. Multiple-soliton solutions of the perturbed KdV equation. Commun Nonlinear Sci Simul 2010;15911:3270–73] are the well-known consequences of the full integrability for the Korteweg–de Vries hierarchy.
Influence of the finite precision on the simulations of discrete dynamical systems

The effect of numerical precision on the mean distance and on the mean coalescence time between trajectories of two random maps was investigated. It was shown that mean coalescence time between trajectories can be used to characterize regions of the phase space of the maps. The mean coalescence time between trajectories scales as a power law as a function of the numerical precision of the calculations in the contracting and transitions regions of the maps. In the contracting regions the exponent of the power law is approximately one for both maps and it is approximately two in the transition regions for both maps. In the chaotic regions, the mean coalescence time between trajectories scales as an exponential law as a function of the numerical precision of the calculations for the maps. For both maps the exponents are of the same order of magnitude in the chaotic regions.
Low-carbon building assessment and multi-scale input–output analysis

Presented as a low-carbon building evaluation framework in this paper are detailed carbon emission account procedures for the life cycle of buildings in terms of nine stages as building construction, fitment, outdoor facility construction, transportation, operation, waste treatment, property management, demolition, and disposal for buildings, supported by integrated carbon intensity databases based on multi-scale input–output analysis, essential for low-carbon planning, procurement and supply chain design, and logistics management.
Numerical solutions of two-dimensional Burgers’ equations by lattice Boltzmann method

In this paper, the two-dimensional Burgers’ equations with two variables are solved numerically by the lattice Boltzmann method. The lattice Bhatnagar–Gross–Krook model we used can recover the macroscopic equation with the second order accuracy. Numerical solutions for various values of Reynolds number, computational domain, initial and boundary conditions are calculated and validated against exact solutions or other published results. It is concluded that the proposed method performs well.
高位心包上隐窝64排CT征象分析

多排螺旋CT出现以前,在对高位心包上隐窝的显示和认识上存在一定的困难,随着多排螺旋CT的出现,不但可以进行横断位薄层扫描,而且可以进行矢状位和冠状位薄层重建,从而可以更加全面地显示高位心包上隐窝的全貌。笔者回顾性分析了7例高位心包上隐窝的64排CT扫描和重建图像,以期提高对高位心包上隐窝及类似疾病的诊断和鉴别诊断能力。
1例重症肺泡蛋白沉积症患者大容量全肺灌洗治疗的护理

肺泡蛋白沉积症是一种少见的慢性肺部弥散性疾病。本院于2010年3月收治此病患者1例,经3次全肺灌洗术后取得满意效果,术后无任何并发症,于术后6周出院,现将护理体会介绍如下。
循证医学与儿科临床实践

随着医学模式由单纯生物医学模式向社会-心理-生物医学模式转变,临床医学行为也由过去的以理论知识和个人经验为指导的模式向以循证医学(evidence-based medicine,EBM)为依据的模式转变。它是医学治疗学的决策指南和发展方向。
室间隔缺损右室膜部瘤破口封堵术1例

1临床资料患者为女性儿童,9岁,发现室间隔缺损(VSD)6年入院。平素无症状,既往史亦无特殊。入院查体:一般情况可,BP84/64 mm Hg,未见紫绀。胸骨左缘第四肋间扪及细震颤,心界增大,心率85次/分,P2亢进,胸骨左缘第四肋间闻及5/6级收缩期杂音。肝脾未及,双下肢无水肿。无杵状指(趾)。心脏B超检查提示:膜部VSD并右室膜部瘤形成,左向右分流;间隔缺损直径1.0cm,缺损上缘紧邻主动脉右冠瓣根部;左房、左室增大;继发性肺动脉高压。其余无特殊,综上考虑先天性心脏病VSD并右室膜部瘤形成诊断成立。
社会技能训练对维持治疗期精神分裂症患者的疗效观察

目的探讨社会技能训练对维持治疗期精神分裂症患者预后的影响。方法选取住院经系统治疗症状明显改善后,在门诊维持治疗的精神分裂症患者,随机将其分为研究组和对照组。在原有抗精神病药物及剂量不变的情况下,对研究组进行程式化社会技能训练模式干预。并采用简明精神病量表(BPRS)及社会功能缺陷筛选量表(SDSS)进行随访评定。结果研究组完成39例,对照组完成40例。经社会技能训练后,研究组BPRS与SDSS平均分与训练前比较差异有统计学意义(P<0.05),而对照组差异无统计学意义(P>0.05)。6个月后研究组与对照组BPRS与SDSS平均分比较差异有统计学意义(P<0.05)。结论对维持治疗期精神分裂症患者,除了药物治疗外,结合积极的社会技能训练可以进一步改善其症状及社会功能。
Thrips: Pests of Concern to China and the United States

Thrips are among the most important agricultural pests globally because of the damage inflicted by their oviposition, feeding, and ability to transmit plant viruses. Because of their invasiveness, a number of pest species are common to both China and the United States and present significant challenges to growers of a wide range of crops in both countries. Among the pest thrips common to both countries are four of the major global thrips pests, Frankliniella occidentalis (Pergande), Scirtothrips dorsalis Hood, Thrips palmi Karny, and Thrips tabaci Lindeman. This review addresses characteristics that enable thrips to be such damaging pests and how biological attributes of thrips create challenges for their management. Despite these challenges, a number of successful management tactics have been developed for various cropping systems. We discuss some of these tactics that have been developed, including the use of cultural controls, biological controls, and judicious use of insecticides that do not disrupt overall pest management programs. The exchange of this type of information will help to facilitate management of pest thrips, especially in regions where species have recently invaded. A prime example is F. occidentalis, the western flower thrips, which is native to the United States, but has recently invaded China. Therefore, management tactics developed in the United States can be adapted to China. Because further success in management of thrips requires a thorough understanding of thrips ecology, we discuss areas of future research and emphasize the importance of collaboration among different countries to enhance our overall understanding of the biology and ecology of thrips and to improve management programs for these widespread pests.
Effects of Long-Term Application of Sulfur-Containing and Chloride-Containing Chemical Fertilizers on Rice Yield and Its Components

Impacts of 33-yr of application of S-containing and Cl-containing chemical fertilizers on rice (Oryza sativa L.) yield and its components were investigated in a red paddy field experiment,south China.The treatments included:1) adding 302 kg SO_4~(2-)-S ha~(-1) yr~(-1) with application of (NH_4)_2SO_4-,K_2SO_4,and calcium superphosphate (SO_4~(2-));2) adding 56 kg SO_4~(2-)-S and 176 kg Cl ha~(-1) yr~(-1) with application of urea,calcium superphosphate,and KCl (Cl-+SO_4~(2-));3) adding 516 kg Cl ha~(-1) yr~(-1) with application of NH_4Cl,KCl,and KH_2PO_4 (Cl-).Under each treatment,the applied N,P,and K nutrients were controlled at conventional rates of 150 kg N ha~(-1) yr~(-1),75 kg P_2O_5 ha~(-1) yr~(-1),225 kg K_2O ha~(-1) yr~(-1),respectively.Under the S-containing fertilizer application,soil SO_4~(2-)-S content showed a first increasing then decreasing trend with years,and was significantly negatively correlated with annual rice yield.Average annual yield significantly declined in an order of Cl-,Cl-+SO_4~(2-),and SO_4~(2-).Under the Cl-treatment,soil SO_4~(2-)-S content was maintained at about 26.5 mg kg~(-1),not showing deficiency.From 1990 to 2000,rice yield declined rapidly under the SO_4~(2-) treatment,and was significantly lower than that under the Cltreatment.After then,there was no significant difference in yield among the treatments.Our results demonstrated that long-term application of S- containing fertilizer could result in excessive accumulation of SO_4~(2-)-S in the red paddy soils of south China,therefore producing a certain threat to rice growth.The Cl- containing fertilizer could be relatively safe.
Yield and Quality Response of Cucumber to Irrigation and Nitrogen Fertilization Under Subsurface Drip Irrigation in Solar Greenhouse

The aims of this research were to compare subsurface drip irrigation scheduling and nitrogen fertilization rates in cucumber, and evaluate yield and quality of cucumber fruit, water (WUE), irrigation water (IWUE), and nitrogen use (NUE) efficiencies in the solar greenhouse in Southwest China. The irrigation water amounts were determined based on the 20 cm diameter pan (E_p) placed over the crop canopy, and cucumber plant was subjected to three irrigation water levels (I1, 0.6 E_p; I2, 0.8 E_p; and I3, 1.0 E_p) in interaction with three nitrogen fertilization levels (N1, 300 kg ha~(-1); N2, 450 kg ha~(-1); and N3, 600 kg ha~(-1)). The results showed that the cucumber fruit yield increased with the improvement of irrigation water. Irrigation water increased yields by increasing the mean weight of the fruits, and also by increasing fruit number. But the highest values of IWUE and WUE were obtained from I2 treatment. NUE significantly decreased with the improvement of N application, but increased by irrigating more water. The quality of cucumber fruit decreased with the improvement irrigation water and nitrogen fertilization. In conclusion, the optimum irrigation level and nitrogen fertilizer application level for cucunber under subsurface drip irrigation in the solar greenhouse in Southwest China were 0.8 E_p and 450 and 600 kg ha~(-1), respectively.
Modeling Study of Fruit Morphological Formation in Melon

Modeling of fruit morphological formation in melon is important for realizing virtual and digital plant growth.The objective of this study was to characterize the changes in patterns of fruit growth characters during plant development.In cultivar experiments,a high-resolution wireless vision sensor network has been developed to realize non-contact automatic uninterrupted measurement of the fruit shape micro-change (fruit size,color,and net).Results showed that the fruit swelling process (vertical and horizontal diameters) exhibited a slow-rapid-slow pattern,which could be well described with a logistic curve against growing degree days (GDD);fruit color changes based on the RGB values could be represented by quadratic relationship to cumulative GDD;the fruit net changes over growth progress could be partitioned into three phases according to the time interval.The first phase was from 1 to 30 days after pollination (DAP),in which the vertical stripe appeared at fruit middle part and the horizontal stripe at fruit petiole and hilum part as well;the second phase was from 30 to 40 DAP,the horizontal stripe occurred at fruit middle part and the net was formed;the third phase was the process started from 40 DAP,the netted breadth and thickness were gradually increased.The model was validated with the independent data from the experiment,and the mean RMSE (root mean square error) of fruit were 0.36 and 0.28 cm for vertical and horizontal diameters,11.9 for fruit color,and 0.45 cm for stripe length and diameter at varied GDD,respectively.This work is beneficial to a reliable foundation for study the relationship between morphological formation and physiological change of the melon fruit internally and then realize the intelligent precision management to improve the yield and quality of greenhouse melon production.
Benefits of Conservation Agriculture on Soil and Water Conservation and Its Progress in China

Conservation agriculture has been practised for three decades and has been spread widely. There are many nomenclatures surrounding conservation agriculture and differ to each other lightly. Conservation agriculture (CA) is a system approach to soil and water conservation, high crop productivity and profitability, in one word, it is a system approach to sustainable agriculture. Yet, because conservation agriculture is a knowledge-intensive and a complex system to learn and implement, and also because of traditions of intensive cultivation, adoption rates have been low, since to date, only about seven percent of the world’s arable and permanent cropland area is farmed under conservation agriculture. The practice and wider extention of conservation agriculture thus requires a deeper understanding of its ecological underpinnings in order to manage its various elements for sustainable intensification, where the aim is to conserve soil and water and improve sustainability over the long term. This paper described terms related to conservation agriculture, presented the effects of conservation agriculture on soil and water conservation, crop productivity, progress and adoption of CA worldwide, emphasized obstacles and possible ways to increase CA adoption to accelerate sustainable development of China agriculture.
Genetic Variation and Yield Performance of Jerusalem Artichoke Germplasm Collected in China

Jerusalem artichoke (Helianthus tuberosus L.) is a perennial tuberous plant rich in inulin and is a potential energy crop.This study was conducted in a semiarid region of the Loess Plateau to investigate variations in morphological and agronomic characteristics and yield performance of 59 Jerusalem artichoke clones collected from 24 provinces in China.The germplasm we collected exhibited variations either in qualitative or in quantitative traits.Substantial genetic variations (genotype coefficient of variation >20%) in the main stem diameter,main stem number per plant,branch number per main stem,tuber number per plant,tuber size,tuber yield,and top yield (i.e.,aboveground biomass) were found as well.Seven clones had a tuber yield ranging between 9.1-10.6 t ha~(-1),7 clones had a top yield ranging between 18.1-31.3 t ha~(-1),and 15 clones had a total biomass yield (i.e.,tuber and top weight) between 25.0-35.0 t ha~(-1) on an oven-dried weight basis under the drought soil and climatic condition in the semiarid region.The 59 Jerusalem artichoke clones were clustered into 8 groups based on 17 quantitative traits,and indicated that the most prevalent clones planted by farmers exhibited relatively low variation.Correlation analysis was conducted on the morphology and agronomy of the clones.This investigation suggests possible genetic improvement of Jerusalem artichoke for a higher tuber yield or a top biomass yield,and as a promising application for inulin or bioenergy in semiarid regions.
Transient Expression of Exogenous Gene into Plant Cell Mediated by PEI Nanovector

This study was carried out to investigate the transfection effect of exogenous gene into plant protoplast cell mediated by polyethylenimine (PEI) nanovector, based on PEI gene delivery system in the field of medical science. PEI/DNA complexes were prepared by using PEI polymer to bind the plant expression plasmid, pCMl205-GFPn. The ability of PEI combining and protecting DNA was investigated by agarose gel electrophoresis retardation assay. The surface characteristics of PEI/DNA complexes were observed with transmission electron microscope. The transfection efficiency of Arabidopsis thaliana protoplasts mediated by PEI/DNA complexes at different N/P ratios was analyzed based on observation of transient expression of green fluorescent protein with confocal laser scanning microscope. PEI could bind and condense DNA, and form stable 100-200 nm PEI/DNA complexes when the proportion of PEl and DNA is in the range of 5:1-1:4. Transfection efficiency of PEI/DNA complexes increased with N/P ratios in range of N/P<5 and reached the highest at N/P=5, and began to decrease beyond N/P>5 as higher toxicity to cells. The transfection efficiency of PEI/DNA complexes at N/P=5 was higher than PEG. This study confirmed that PEI nanovector could effectively mediate foreign gene entering into A. thaliana protoplast cell to obtain transient expression, which may be developed as a hopeful and novel transgenic method combined with plant protoplast regeneration.
Plant Growth,Yield Components,Economic Responses,and Soil Indigenous K Uptake of Two Cotton Genotypes with Different K-Efficiencies

HG103,a high K-efficiency cotton cultivar with high-yield potential,and LG122,a low K-efficiency cotton cultivar with low-yield potential were used to study the genotypic variation on yield,economic responses,and soil indigenous K exploitation for cotton in pot and field conditions in 2006 and 2007.Results indicated that both the cultivars differed significantly in the rate of translocation of dry matter into reproductive organs and the time of running into reproductive stage.Cotton yield and economic parameters of HG103 were much better than LG122.Potassium content in cotton shells reached the highest level at maturity stage for both genotypes.Results also showed that the K content in each plant part of HG103 was lower than that of LG122.The two genotypes showed different efficiencies and abilities on absorbing soil rapidly available K and slowly available K.LG122 showed higher absorption of K rate than HG103 after K fertilization,but on the contrary,HG103 uptake more soil indigenous K than LG122 in no K fertilization treatment.This result indicated that HG103 could tolerant and absorb more soil indigenous K than LG122,under condition of soil K stress.LG122 could grow well and absorb more K nutrient when soil K supply is sufficient.Our results demonstrated that higher K content in plant tissues and higher K uptake by plant may not an exclusive condition for high yield planting with K fertilization.Earlier translocation of more dry matters into reproductive organs is one of the key mechanisms of high K use efficiency in cotton.