BASF Considers Construction of MDI Plant in Chongqing

BASF says it is considering the construc-tion of a new MDI(diphenylmethanediisocyanate)plant in Chongqingmunicipality,Western China,to meetgrowing demand for this product.A cor-responding memorandum of coopera-tion was signed on June 12th

China Considers Environmental Tax

China is considering to levy the Environment Tax in order to further practice theplan of energy saving and emission reduction(pollution control).The NationalDevelopment and Reform Commission(NDRC)says in the Energy-saving andLow Emission Scheme(ESLES)formed by it and other relevant authorities.The State Environmental Protection Administration of China(SEPA)is

精神价值是竞技运动的灵魂

精神价值是竞技运动的灵魂ＳＰＩＲＩＴＶＡＬＵＥＩＳＴＨＥＳＯＵＬＯＦＡＴＨＬＥＴＩＣＳ任海ＲｅｎＨａｉ编者导语百年奥运盛会虽然已经成为历史，但留给人们的思索却仍在继续：奥林匹克的商业化问题、运动训练方面的问题、奥运项目的战略布局问题……林林总总。本...

Is multi-hazard mapping effective in assessing natural hazards and integrated watershed management?

Natural hazards are often studied in isolation.However,there is a great need to examine hazards holistically to better manage the complex of threats found in any region.Many regions of the world have complex hazard landscapes wherein risk from individual and/or multiple extreme events is omnipresent.Extensive parts of Iran experience a complex array of natural hazards-floods,earthquakes,landslides,forest fires,subsidence,and drought.The effectiveness of risk mitigation is in part a function of whether the complex of hazards can be collectively considered,visualized,and evaluated.This study develops and tests individual and collective multihazard risk maps for floods,landslides,and forest fires to visualize the spatial distribution of risk in Fars Province,southern Iran.To do this,two well-known machine-learning algorithms-SVM and MARS-are used to predict the distribution of these events.Past floods,landslides,and forest fires were surveyed and mapped.The locations of occurrence of these events(individually and collectively) were randomly separated into training(70%) and testing(30%) data sets.The conditioning factors(for floods,landslides,and forest fires) employed to model the risk distributions are aspect,elevation,drainage density,distance from faults,geology,LULC,profile curvature,annual mean rainfall,plan curvature,distance from man-made residential structures,distance from nearest river,distance from nearest road,slope gradient,soil types,mean annual temperature,and TWI.The outputs of the two models were assessed using receiver-operating-characteristic(ROC) curves,true-skill statistics(TSS),and the correlation and deviance values from each models for each hazard.The areas-under-the-curves(AUC) for the MARS model prediction were 76.0%,91.2%,and 90.1% for floods,landslides,and forest fires,respectively.Similarly,the AUCs for the SVM model were 75.5%,89.0%,and 91.5%.The TSS reveals that the MARS model was better able to predict landslide risk,but was less able to predict flood-risk patterns and forest-fire risk.Finally,the combination of flood,forest fire,and landslide risk maps yielded a multi-hazard susceptibility map for the province.The better predictive model indicated that 52.3% of the province was at-risk for at least one of these hazards.This multi-hazard map may yield valuable insight for land-use planning,sustainable development of infrastructure,and also integrated watershed management in Fars Province.

某车辐式张弦结构设计

大跨度张弦梁结构性能优越,在工程中得到广泛应用。结合一种具有涌泉造型的车辐式张弦结构,利用Rhino软件中的Grasshopper插件进行曲梁建模,采用Catenary运算器确定索形,有效提高了建模速度。考虑结构的最不利工况与初始缺陷的影响,对结构进行了静力分析、动力特性分析、整体稳定计算和抗连续倒塌分析,计算结果满足相关规范标准要求。在车辐结构周边设置采用人字形支撑,通过关节轴承节点实现与主体结构的连接,对主体结构适应性较强。最后,提出对车辐式张弦结构的设计建议,可供类似工程参考。

Interval arithmetic operations for uncertainty analysis with correlated interval variables

A new interval arithmetic method is proposed to solve interval functions with correlated intervals through which the overestimation problem existing in interval analysis could be significantly alleviated. The correlation between interval parameters is defined by the multidimensional parallelepiped model which is convenient to describe the correlative and independent interval variables in a unified framework. The original interval variables with correlation are transformed into the standard space without correlation,and then the relationship between the original variables and the standard interval variables is obtained. The expressions of four basic interval arithmetic operations, namely addition, subtraction, multiplication, and division, are given in the standard space. Finally, several numerical examples and a two-step bar are used to demonstrate the effectiveness of the proposed method.

Vibration analysis of hard-coated composite beam considering the strain dependent characteristic of coating material

The strain dependent characteristics of hard coatings make the vibration analysis of hard-coated composite structure become a challenging task. In this study, the modeling and the analysis method of a hard-coated composite beam was developed considering the strain dependent characteristics of coating material. Firstly, based on analyzing the properties of hard-coating material, a high order polynomial was adopted to characterize the strain dependent characteristics of coating materials. Then, the analytical model of a hard-coated composite beam was created by the energy method. Next, using the numerical method to solve the vibration response and the resonance frequencies of the composite beam, a specific calculation flow was also proposed. Finally,a cantilever beam coated with Mg O ＋ Al2_O_3 hard coating was chosen as the study case; under different excitation levels, the resonance region responses and the resonance frequencies of the composite beam were calculated using the proposed method. The calculation results were compared with the experiment and the linear calculation, and the correctness of the created model was verified. The study shows that compared with the general linear calculation, the proposed method can still maintain an acceptable precision when the excitation level is larger.

Olfactory proteotyping: towards the enlightenment of the neurodegeneration

Although phylogenetically ancient,the olfactory system has received less attention than other sensorial systems.However,olfactory dysfunction is considered an early prodromal event in neurodegenerative diseases(NDs)(Doty,2012;Attems et al.,2014),which may vary from severe smell loss(e.g.,Alzheimer’s and Parkinson’s diseases)to relatively moderate loss(e.g.,progressive supranuclear palsy)(Doty,2017).Recently,a cluster of neuropathological and functional discoveries has evidenced the relevant role of the olfactory bulb(OB)during the neurodegenerative process(Attems et al.,2014;Rey et al.,2018).For instance,the double-transgenic APP/PS1 mouse model of Alzheimer’s disease(AD)develops early proteomic disturbances accompanied by a specific modulation of the focal adhesion kinase(FAK)and mitogen-activated protein kinase(MAPK)dynamics at the level of the OB,demonstrating that olfactory molecular alterations occur prior toβ-amyloid plaque appearance and memory impairments in APP/PS1 transgenic mice(Lachen-Montes et al.,2016).

An adjustment method for active reflector of large high-frequency antennas considering gain and boresight

The design of the Qitai 110 m Radio Telescope（QTT） with large aperture and very high working frequency（115 GHz） was investigated in Xinjiang, China. The results lead to a main reflector with high surface precision and high pointing precision. In this paper, the properties of active surface adjustment in a deformed parabolic reflector antenna are analyzed. To assure the performance of large reflector antennas such as gain and boresight, which can be obtained by utilizing an electromechanical coupling model, and satisfy them simultaneously, research on active surface adjustment applied to a new parabolic reflector as target surface has been done. Based on the initial position of actuators and the relationship between adjustment points and target points, a novel mathematical model and a program thatdirectly calculates the movements of actuators have been developed for guiding the active surface adjustment of large reflector antennas. This adjustment method is applied to an 8 m reflector antenna,in which we only consider gravity deformation. The results show that this method is more efficient in adjusting the surface and improving the working performance.

A new model for analyzing nonlinear torsion behavior of concrete filled steel tube columns with rectangular section

An experimental study on concrete filled steel tube columns with rectangular section subjected to compressionflexure-torsion combined action has been carried out. The failure modes and load-deformation hysteretic relations were obtained. Based on the principles of classical material mechanics, the relations between the torsion curvature of the section and the shear strain of the fiber on the section were established. Then the strain distribution on the rectangular section of concrete filled steel tube columns subjected to torsion was analyzed. The three-dimensional refined finite element model was also built, in order to make the precision verification. The matrix forms of the relation between the torsion curvature of the section and the shear strain of the fiber on the section were derived, and introduced into the fiber beam model considering nonlinear torsion effect on the section. The comparison between test results and calculation results showed that the fiber beam model considering nonlinear torsion effect had high modeling efficiency and solution precision for predicting the torsion behavior of concrete filled steel tube columns with rectangular sections, and was suitable for analyzing the dynamic response of various structures subjected to the combined cyclic load caused by the earthquake load.

从“克己复礼”到“义以为质”——孔子“礼之本”思想的渊源及其他

孔子认为,礼不能仅仅是表面的形式化的"仪",行礼时要有真情实感——"敬","礼"应该"义以为质"或者说"仁以为质"。这些思想在他的前贤那里也都一定程度上具有了,孔子的贡献在于把"义"看做是达"道"的手段,"仁"本身就是目的,而在其前人那里,"义"和"仁"却只是实现某种利益的手段。

New method for oblique impact dynamics research of a flexible beam with large overall motion considering impact friction force

A flexible beam with large overall rotating motion impacting with a rigid slope is studied in this paper. The tangential friction force caused by the oblique impact is analyzed. The tangential motion of the system is divided into a stick state and a slip state. The contact constraint model and Coulomb friction model are used respectively to deal with the two states. Based on this hybrid modeling method, dynamic equations of the system, which include all states（before, during, and after the collision）are obtained. Simulation results of a concrete example are compared with the results obtained from two other models： a nontangential friction model and a modified Coulomb model. Differences in the results from the three models are discussed. The tangential friction force cannot be ignored when an oblique impact occurs. In addition, the results obtained from the model proposed in this paper are more consistent with real movement.

Robust Optimization Operation of Power System Considering the Non-probabilistic Uncertainty of Parameter

Probabilistic method requires a lot of sample information to describe the probability distributions of uncertain variables and has difficulty in dealing with the optimization problem with uncertain parameters which contains unsufficient information.To solve this problem,a robust optimization operation method based on information gap decision theory(IGDT) is presented considering the non-probabilistic uncertainties of parameters.By the proposed method the maximum resistance to the disturbance of uncertain parameters is achieved and the optimization strategies with uncertain parameters are presented.Finally,numerical simulation is performed on the modified IEEE-14 bus system.Numerical results show the effectiveness of the proposed approach.

consider用法透视

在SEFC Book Ⅱ B Lesson 79中有这样一个句子：“Some people have the wrong attitude towards people with disabilities,considering them to be stupid.”“有些有对待残疾人的态度不好，认为他们愚蠢。”句中的consider后面跟着一个带有动词不定式的复合结构，

Toxocara infection in gardener

To the editor,The report on Toxocara infection in gardener is very interesting[1].Esquivel et al.concluded that"gardeners do not have a higher risk for Toxocara infection than subjects of the general population in Durango City,Mexico"[1].In fact,considering the source of infection of Toxocara,it can be at risk for anyone who contacts it.As an occupation,gardener might have a chance to contact soil.In fact,everyone has to contact soil and the gardener does not live all day but part of

Scale-Covariant Theory of Gravitation Through Self-Similarity

We study the scale-covariant theory of gravitation proposed by Canuto under the self-similar hypothesis.By considering the matter collineation approach,we deduce the form of the main quantities and obtain some restrictions on the behavior of the gauge function,φ(t).We apply the obtained results to study the Bianchi I,Ⅶo,Ⅸ and Kantowsky Sachs models,and arrive at the conclusion that instead of considering a varying G theory,the solution is only valid for a particular value of the parameter of the equation of state,γ,.This leads us to obtain φ(t) =const,and by taking into account the external condition,Gφ2 =const,we may arrive at the conclusion that G=const.Therefore,all the obtained solutions are the same as the ones obtained in the framework of general relativity.

STUDY ON MUTAGENICITY OF TITANIUM ASCORBATE.

Titanium ascorbate(Ti-AsA),that was used in agriculture,livestock farming and fishery,showed good results ofincreasing production.Author studied mutability ofTi-AsA with vitro toxicological method for the

A New Simulation of Track Structure of Low-Energy Electrons in Liquid Water:Considering the Condensed-Phase Effect on Electron Elastic Scattering

A new Monte Carlo simulation of the track structure of low-energy electrons （〈10keV） in liquid water is presented. The feature of the simulation is taken into consideration of the condensed-phase effect of liquid water on electron elastic scattering with the use of the Champion model, while the dielectric response formalism incorporating the optical-data model developed by Emfietzoglou et al. is applied for calculating the electron inelastic scattering. The spatial distributions of energy deposition and inelastic scattering events of low-energy electrons with different primary energies in liquid water are calculated and compared with other theoretical evaluations. The present work shows that the condensed-phase effect of liquid water on electron elastic scattering may be of the influence on the fraction of absorbed energy and distribution of inelastic scattering events at lower primary energies, which also indicate potential effects on the DNA damage induced by low-energy electrons.

THE MONOPOLE PROBLEM AND THE PRIMORDEAL BLACK HOLE PROBLEM IN THE INFLATIONARY UNIVERSE

By considering the non-uniform phase transition,a theoretical lower bound of the probability of finding the rt Hooft-Polyakov monopole in the so-called Inflationary universe is given.