传统农业生态系统的实态分析——以松江县华阳镇为例

According to the survey report of 63 farmer household at Songjiang county in 1940,traditional agricultural ecosystem was analyzed. The ecosystem was not a typical closed system as other ecosystem in traditional society, but a open system by market. Although having higher organic fertilizer input, the ecosystem was in a nitrogen-Limitative State.

德国地理教育实态分析及启示

文章全面介绍了德国中小学及高校的教育体系现状及德国地理教育发展过程,系统总结了德国中小学及高校地理课程的设置特点,集中阐释了其对我国中小学及高校地理教育的启示。指出借鉴并吸收德国地理教育中先进的理念,将有助于优化我国地理教育过程。

从日本经济学理念看其实态分析方法

日本没有诺贝尔经济学奖得主,但是日本却成为一个经济大国,尽管其中的原因很复杂,但日本经济分析方法所起的作用却是不可忽视的。实态分析方法就是日本经济分析方法的一大特色。该文从日本经济体制的独特性和思维方式的特点来分析实态经济分析方法形成的主要原因,阐述了日本实态分析方法的特征,为我国的经济研究提供了有益的参考。

我国企业集团的实态分析

我国企业集团的发展历程表明:企业集团是国家宏观调控的中间层,是计划经济与市场调节相结合的衔接点,是突破地区界限、实现优势互补和规模经济效益的推动器,是发展外向型经济、参与国际竞争的主力军。无论是现实的选择还是远期考虑,企业集团在我国经济调整。

钻床夹具对刀误差的实态分析

钻床夹具是机械加工中应用较多的一种夹具，其加工孔的位置精度受诸多因素的影响，对刀误差就是影响因素之一。为了满足被加工零件孔位置精度的要求，长期以来，人们一直采用极值法进行对刀误差的计算。而用极值法计算时，假设的极限状态在零件加工中很少出现，致使夹具的...

经济增长与工资结构—1955年日本工资实态分析

令人信服的结论和可供利用的经验来自对以往某些典型发展的分析。本文研究的目的在于,通过对1955年日本工资实态的分析,证明在资本主义条件下,何种工资结构有利于经济的增长,并由此引出可供我们借鉴的经验。

Dynamic experiments on flocculation and sedimentation of argillized ultrafine tailings using fly-ash-based magnetic coagulant

In order to accelerate the sedimentation of super-large-scale argillized ultrafine tailings with bad features such as low settling velocity, muddy overflow water, and large flocculant dosage, a fly-ash-based magnetic coagulant （FAMC） was used in a dynamic experimental device. To obtain the best possible combination of the impact factors （magnetic intensity, FAMC dosage, flocculant dosage, and feed speed） for minimum overflow turbidity, a response surface methodology test coupled with a four-factor five-level central composite design was conducted. The synergy mechanism of FAMC and flocculant was analyzed based on the potential measurement and scanning electron microscopy. The results show that the flocculant dosage, overflow turbidity, and solid content can be reduced by 50%, 90%, and 80%, while the handling capacity per unit and efficiency of backfill and dry stacking can be promoted by 20%, 17%, and 13%, respectively, with a magnetic intensity of 0.3 T, FAMC dosage of 200 mL/t, flocculant dosage of 30 g/t, and feed speed of 0.6 t/（m^2·h）. Therefore, synergy of FAMC and flocculant has obvious efficiency in saving energy and protecting the environment by allowing 70×10^6 t/a of argillized ultrafine tailings slurry to be disposed safely and efficiently with a cost saving of more than 53×106 Yuan/a, which gives it great promise for use in domestic and foreign mines.

大气污染侵权民事诉讼现状研究——以辽宁省30个大气污染环境侵权案件为样本

辽宁省大气污染侵权民事案件实证分析结果表明,辽宁省大气污染环境司法裁判专业性极强,审判难度较大;大气污染侵权的原告多为个人,被告多为企业,原被告之间矛盾尖锐;公众环境修复意识淡薄,环境保护意识仍有待提高。文章认为如何提高环境司法裁判能力,明确大气污染环境侵权举证责任分配,确定证明标准和鉴定结论采信标准仍是司法实践中亟须解决的重点难点问题。

Analysis and implementation of a new hyperchaotic system

Based on a modified Lorenz system, a relatively simple four-dimensional continuous autonomous hyperchaotic system is proposed by introducing a state feedback controller. The system consists of four coupled first-order ordinary differential equations with three nonlinear cross-product terms. Some dynamical properties of this hyperchaotic system, including equlibria, stability, Lyapunov exponent spectrum and bifurcation, are analysed in detail. Moreover, an electronic circuit diagram is designed for demonstrating the existence of the hyperchaos, and verifying computer simulation results.

Dynamic characteristic analysis of whole machine tools based on Kriging model

In order to study the variation of machine tools’dynamic characteristics in the manufacturing space,a Kriging approximate model is proposed.Finite element method(FEM)is employed on the platform of ANSYS to establish finite element(FE)model with the dynamic characteristic of combined interface for a milling machine,which is newly designed for producing aero engine blades by a certain enterprise group in China.The stiffness and damping of combined interfaces are adjusted by using adaptive simulated annealing algorithm with the optimizing software of iSIGHT in the process of FE model update according to experimental modal analysis(EMA)results.The Kriging approximate model is established according to the finite element analysis results utilizing orthogonal design samples by taking into account of the range of configuration parameters.On the basis of the Kriging approximate model,the response surfaces between key response parameter and configuration parameters are obtained.The results indicate that configuration parameters have great effects on dynamic characteristics of machine tools,and the Kriging approximate model is an effective and rapid method for estimating dynamic characteristics of machine tools in the manufacturing space.

Application of experimental modal analysis technique to structural design of linear vibrating screen

A large model of the screen was mounted in the laboratory for studying its modal performance. The model is suspended with steel ropes. Modal test was carried out with artificially exciting by 500 g impacting hammer and 100 kg exciting force shaker respectively. Synthesis and correction of the modal parameters are obtained from both testing methods. Design faults of vibrating screen were determined based on the analy-sis and dynamic correction of structure approaches about the screen was put forward finally.

Study on effects of environmental temperature on dynamic characteristics of Taizhou Yangtze River Bridge

The dynamic characteristics of three-tower and two-span suspension bridge are analyzed at different global temperatures. An equivalent cable inner force method is proposed to consider temperature effects and to study the effects of environmental temperature on dynamic characteristics of Taizhou Yangtze River Bridge. The result demonstrates that the effects of temperature can not be neglected in static or dynamic analysis of Taizhou Yangtze River Bridge. The relationship between temperature and frequency is negative. The effects of temperature should be taken into account in experimental modal analysis of long-span bridges and damage identification.

Numerical and Experimental Research on the Influence of the Centrifugal Pumps Rotor Damage on Their Natural Frequency Response

The paper presents process of creating a centrifugal pump rotor model in CAD environment. Modeling of a virtual object was divided into two stages, modeling of the efficient pump and the simulated failure of one of the impeller＇s blades. Comparison of the results of the resonance frequency obtained from the model analysis, with those obtained from measurements on the actual object was shown. Measurements and simulations were conducted on the pump before and after the simulated damaged of the rotor. In order to verify the model the rotor of pump was weighted and compared with the masses of the respective components obtained from the virtual object. In the second stage genuine rotor was subjected to the experimental modal analysis.

Identification of Suspension Bridge Parameters under Exploitational Conditions

The paper concerns a research into dynamic properties of the steel suspension bridge across Opolska Street in Krakow, Poland. Parameter identification was carried out with the application of the nonlinear system identification method on the basis of system responses to exploitational excitation resulting from pedestrian traffic. In order to verify obtained results, on the basis of the geometrical and material properties of the considered system, the FEM （finite elements model） was created. Created FEM model was updated through the comparison with the model determined by the use of experimental modal analysis method and then applied to analytical evaluation of the considered suspension bridge natural frequencies.

How Does Online Fundraising Platform Promote Public Donation in China？-An Empirical Analysis From Tencent Fundraising Platform

At present, the huge problem that China’s Non-profit Organizations are facing is the low efficiency of public fundraising. However, the newly appeared Online Fundraising Platform indicates some possibilities in overcoming the obstacle for public fundraising. Among which Tencent Online Fundraising Platform becomes the typical and the point cut of exploring Online Fundraising Platform Improving Efficiency Mechanism of public donation. Online Fundraising Platform is similar to the online United Way, relying on the advantages of the Internet and the united fundraising to build a ecosystem of public donation which has professional fundraising system, good charity atmosphere, excellent policy environment and crossover cooperation resources. And in which, many factors get improved in pubic donation influence factors system. For one thing, Charity atmosphere and policy environment can be shaped better. For another, the charities can transmit fundraising information in inexpensive and high-efficiency way, and must ensure the transparency of project and donation. Finally, it will be more convenient for donors to get charitable information, make donations and supervise the nonprofit organizations.

Geometric precision evaluation methodology of multiple reference station network algorithms

To evaluate the performance of real time kinematic (RTK) network algorithms without applying actual measurements, a new method called geometric precision evaluation methodology (GPEM) based on covariance analysis was presented. Three types of multiple reference station interpolation algorithms, including partial derivation algorithm (PDA), linear interpolation algorithms (LIA) and least squares condition (LSC) were discussed and analyzed. The geometric dilution of precision (GDOP) was defined to describe the influence of the network geometry on the interpolation precision, and the different GDOP expressions of above-mentioned algorithms were deduced. In order to compare geometric precision characteristics among different multiple reference station network algorithms, a simulation was conducted, and the GDOP contours of these algorithms were enumerated. Finally, to confirm the validation of GPEM, an experiment was conducted using data from Unite State Continuously Operating Reference Stations (US-CORS), and the precision performances were calculated according to the real test data and GPEM, respectively. The results show that GPEM generates very accurate estimation of the performance compared to the real data test.

Low Complexity SOVA for Turbo Codes

Recently, trimming Soft-output Viterbi algorithm(T-SOVA) has been proposed to reduce the complexity of SOVA for Turbo codes. In its fi rst stage, a dynamic algorithm, lazy Viterbi algorithm, is used to indicate the minimal metric differences which brings obstacle on hardware implementation. This paper proposes a Viterbi algorithm(VA) based T-SOVA to facilitate hardware implementation. In the first stage of our scheme, a modified VA with regular structure is used to fi nd the maximum likelihood(ML) path and calculate the metric differences. Further, local sorting is introduced to trim the metric differences, which reduces the complexity of trimming operation. Simulation results and complexity analysis show that VA based T-SOVA performs as well as lazy VA based T-SOVA and is easier to be applied to hardware implementation.

Dynamic evaluation of traffic flows on city roads

This paper presents an analysis of the random fluctuations, deferred conduction effect and periodicity of road traffic based on the basic features of road networks. It also discusses the limitations of road network evaluation theories based on road "V/C". In addition, it proposes a set of theoretical and technical methods for the real-time evaluation of traffic flows for entire road networks, and for solving key technical issues, such as real-time data collection and processing in areas with no blind zones, the spatial-temporal dynamic analysis of road network traffic, and the calibration of key performance index thresholds. It also provides new technical tools for the strategic transportation planning and real-time diagnosis of road traffic. The new tools and methodology presented in this paper are validated using a case study in Beijing.

Massive Pericardial Effusion as the First Manifestation of Hypothyroidism in a Male Patient

This article intends to report a rare case of massive pericardial effusion as the first manifestation of hypothyroidism. A 45-year-old male patient, accompanied by a cardiology department, suddenly started to present signs of dyspnea and tiredness. He was submitted to an echocardiogram and diagnosed with dilated cardiomyopathy associated with a moderate pericardial effusion and low ejection of fraction. The laboratory tests showed elevated TSH levels （13.20 mIU/L）, what leads to the hypothyroidism diagnose and enable to start the treatment with levothyroxine. The patient has not followed correctly the treatment, reason why he has not showed any improves. He was admitted in the hospital to cardiology monitoring and the chest radiography confirmed an intense pericardial effusion. Then, the patient was submitted to the pericardiocentesis procedure, which was capable of remove the pericardial fluid for laboratory analysis and fragment of the pericardial sac for neoplastic cell research. After the hospital discharge, he was maintained in outpatient follow-up, when showed an important improvement in the clinical state.