实验性低甲状态下甲状腺肿大与肥大细胞的相关性研究

用组织学方法制作不同时期小鼠甲状腺的石蜡切片,并进行H.E,TB和AB S染色,以观察甲状腺组织结构、肥大细胞数量及其组化性质的动态变化.结果表明,在甲状腺肿大过程中,甲状腺滤泡直径增大(30d,直径为(383.90±52.79)μm),并逐渐向不规则形(55d)及细胞团索(65d)发展;肥大细胞的数量逐渐增多,且同期均极显著地高于对照组(P<0.01);肥大细胞的红色、红蓝混合颗粒逐渐减少,蓝色颗粒逐渐增多;肥大细胞的CEC值逐渐变小,这说明小鼠在实验性低甲状态下甲状腺肿大组织中肥大细胞的数量和组化性质呈动态变化.

基于大数据分析的电力系统状态实验仿真

本文在电力系统仿真实验室的基础上依靠电力系统仿真软件,组建了基于大数据分析方法的电力系统状态仿真平台。其中包括了组成系统结构的软件和硬件部件,整体组合结构以及基于大数据分析的接口技术和软件系统。通过对风电系统的大数据仿真分析,得出相应的分析结果。该平台可用于广大科研院所的教学研究和仿真分析,并可以将传统结果与大数据分析进行结合用以进一步的研究。

在物理化学实验教学中培养学生的非智力因素

物理化学实验的目的是对学生的智力因素(包括观察、操作、思维以及分析和解决问题的能力等)进行培养.然而,学生的非智力因素(主要指意志、情感、毅力、习惯、兴趣等方面的因素)也参与并且影响实验教学的进程和质量.所以,在物理化学实验教学中,对生学进行各种能力培养的同时,还应注重对学生的非智力因素的培养。

高温测厚误差的计算方法

本文主要叙述一种计算高温测厚误差的方法—一元线性回归法,在高温实验状态下,通过对所测厚度值与常温测值的误差分析,并通过一元线性回归方法总结出其误差的一元线性回归方程,在实际测量中进行验证。

如何选购节能灯

据全国电光源标准化中心屈主任介绍说,选购时应注意以下几点,一是看有没有国家级的检验报告;二是看产品的外包装,包括产品的商标、标称功率、标记的内容、用软湿布擦拭,清晰可辨即为合格;三是使用寿命。

Application of extension neural network to safety status pattern recognition of coalmines

In order to accurately and quickly identify the safety status pattern of coalmines,a new safety status pattern recognition method based on the extension neural network (ENN) was proposed,and the design of structure of network,the rationale of recognition algorithm and the performance of proposed method were discussed in detail.The safety status pattern recognition problem of coalmines can be regard as a classification problem whose features are defined in a range,so using the ENN is most appropriate for this problem.The ENN-based recognition method can use a novel extension distance to measure the similarity between the object to be recognized and the class centers.To demonstrate the effectiveness of the proposed method,a real-world application on the geological safety status pattern recognition of coalmines was tested.Comparative experiments with existing method and other traditional ANN-based methods were conducted.The experimental results show that the proposed ENN-based recognition method can identify the safety status pattern of coalmines accurately with shorter learning time and simpler structure.The experimental results also confirm that the proposed method has a better performance in recognition accuracy,generalization ability and fault-tolerant ability,which are very useful in recognizing the safety status pattern in the process of coal production.

Softening response under undrained compression following anisotropic consolidation

Experimental evidence has indicated that clay exhibits strain-softening response under undrained compression following anisotropic consolidation.The purpose of this work was to propose a modeling method under critical state theory of soil mechanics.Based on experimental data on different types of clay,a simple double-surface model was developed considering explicitly the location of critical state by incorporating the density state into constitutive equations.The model was then used to simulate undrained triaxial compression tests performed on isotropically and anisotropically consolidated samples with different stress ratios.The predictions were compared with experimental results.All simulations demonstrate that the proposed approach is capable of describing the drained and undrained compression behaviors following isotropic and anisotropic consolidations.

Viscous property of dried clay

One dimensional and triaxial compression tests of air-dried and oven-dried Fujinomori clay and Pisa clay were carried out. Water content is less than 4.5% and 1.0% for air-dried and oven-dried clay specimens, respectively. In all tests, axial strain rate was changed stepwise many times and drained creep tests were performed several times during monotonic loading at a constant strain rate. Global unloading (and also reloading in some tests) was applied during which creep loading tests were performed several times. Cyclic loading with small stress amplitude and several cycles was also performed to calculate the modulus of elasticity of the clay in tests. Local displacement transducer was used in triaxial compression test to increase measuring accuracy of axial strain. The results show that air-dried and oven-dried clay have noticeable viscous properties; during global unloading, creep deformation changes from positive to negative, i.e. there exist neutral points (zero creep deformation or no creep deformation point) in global unloading part of strain-stress curve; viscous property of Fujinomori clay decreases when water content decreases, i.e. viscous property of air-dried Fujinomori clay is more significant than that of oven-dried Fujinomori clay.

Two-state energy model and experimental study of coal adsorb methane

There are two states of methane existing in coal, free methane and adsorptive methane. The two states of methane exchanged with each other which need the energy exchange with outside. It is released heat when methane adsorption on coal, instead of absorbed heat. According to the gas molecules Boltzmann energy distribution, is obtained the equilibrium equations of the two states of methane in coal, as well as the heat of adsorption equation when exchanged into each other. At the same time, high temperature experiments of methane adsorption on coal have been certificated to the theoretical model. At last the experimental results presented that： the two-state energy model could be accurately described the distribution of the two states of methane in the coal; the adsorption heat is related to the initial equilibrium state of methane adsorption; the adsorption heats are different with different coal ranks.

Influence of Operating Conditions on the Removal Cd Ions from Aqueous Media by Adsorption Using Chlamydomonas Reinhardtii

Chlamydomonas reinhardtii(C.reinhardtii) was used to study adsorption of cadmium(Cd) from aqueous media within various experimental conditions.Results showed that the adsorption process was very fast,with most of the adsorption occurring within 30 min of contact time and the equilibrium state was reached in about 60 min.The adsorption ability of the algae increases with the increasing adsorptions sites on cells.Maximum adsorption was observed at the initial Cd concentration of 100 mg/L and pH 6.0. The adsorption was markedly inhibited in the presence of calcium and magnesium ions at 10 mM and the Cd removal efficiency was reduced by 16.54%and 14.99%respectively.This study would be a finding of note with regard to practical wastewater treatment.

Strategies to Overcome Filter Divergence in the DRP-4-DVar Approach

This paper discusses an important issue related to filter divergence in the dimension-reduced projection,four-dimensional variational data assimilation(DRP-4-DVar) approach.Idealized experiments with the Lorenz-96 model over a period of 200 days showed that the amplitudes of the root mean square errors(RMSEs) reached the same levels as those of the state variables after approximately 100 days because of the accumulation of sampling errors following the cycle of assimilation.Strategies to reduce sampling errors are critical to ensure the quality of ensemble-based assimilation.Numerical experiments showed that localization and reducing observational errors can alleviate,but cannot completely overcome,the filter divergence in the DRP-4-DVar approach,while the method of perturbing observations and the inflation technique can efficiently eliminate the filter divergence problem.

Analysis of Y(4660) and Related Bound States with QCD Sum Rules

In this article, we take the vector charmonium-like state Y（4660） as a φ＇ fo（980） bound state （irrespective of the hadro-charmonium and the molecular state） tentatively, and study its mass using the QCD sum rules. The numerical value My = 4.71 ±0.26 GeV is consistent with the experimental data. Considering the SU（3） symmetry of the light flavor quarks and the heavy quark symmetry, we also study the bound states φ＇a（400-1200）, γ′″ fo（980）, and γ′″σ（400-1200） with the QCD sum rules, and make reasonable predictions for their masses.

Dynamic of Polystyrene Microsphere Linking to DNA Molecule under Optical Tweezer

Up to now there are many works investigated the stretched state of deoxyribonucleic axid （DNA） by optical trap. The main purpose of mentioned works is to find out the elastic force-extension characterisitic approximatelly based on the experimental parameters. In experiments, the optical force is seem as an apply force, but not an own elastic force of DNA molecules. To use sufficiently optical tweezer to manipulate and hold the DNA molecules keeping in stretched state, it is necessary to use the elastic as one force contributing to process trapping it, and consequently, the term describing elastic force must be present in the general Langevin equation （GLE） describing the dynamic of driven bead linking to DNA molecule. In this paper, the finite difference equation of GLE is derived for simulation the dynamic of bead linking to DNA molecule embedded in the fluid. The process manipulation of polystyrene bead to tweezer center is simulated and discussed. From results, the role of Brownian force, elastic force and optical force on process trapping driven bead is evaluated. Moreover, the trapping time, velocity of bead are discussed, too.

Experimental Confirmation on the Calibration Curves for Preston＇s Method

The Preston＇s method is considered as one of the most commonly employed methods to measure the wall shear stress. However, it is only possible to determine the wall shear stress from measured pressure differences of the Preston tube and undisturbed static pressure, combined with calibration curves, which depend on the Preston tube diameter, fluid density, and viscosity. Since its invention, no significant advancement in theory has been made, and calibration curves proposed by Preston, Patel and Bechert are still in use. In the present study, a need to measure surface shear stress over a circular cylinder prompted us to develop our original Preston tube system. The developed system has been calibrated by measuring the wall shear stress in the fully developed turbulent flow regime in a circular pipe. The present results generally confirm the previously reported calibration curves. A slight modification of the coefficients in the calibration equation shows further improvement.

Mental EEG Analysis Based on Infomax Algorithm

The patterns of EEG will change with mental tasks performed by the subject. In the field of EEG signal analysis and application, the study to get the patterns of mental EEG and then to use them to classify mental tasks has the significant scientific meaning and great application value. But for the reasons of different artifacts existing in EEG, the pattern detection of EEG under normal mental states is a very difficult problem. In this paper, Independent Component Analysis is applied to EEG signals collected from performing different mental tasks .The experiment results show that when one subject performs a single mental task in different trials, the independent components of EEG are very similar. It means that the independent components can be used as the mental EEG patterns to classify the different mental tasks.

Traffic Flow States in a Freeway with Bottleneck

The system of mixture of single lane and double lane is studied by a cellular automata model, which is developed by us based on the Nagel and Schreckenberg＇s models. We justify that the model can reach a stable states quickly. The density distributions of the stable state is presented for several cases, which illustrate the manner of the congestion. The relationship between the outflow rate and the total number of vehicles and that between the outflow rate and the density just before the bottleneck are both given. Comparing with the relationship that occurring in the granular flow, we conclude that the transition from the free traffic flow to the congested traffic flow can also be attributed to the abrupt variation through unstable flow state, which can naturally explain the discontinuities and the complex time variation behavior observed in the traffic flow experiments.

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.

An Experience of On-site PD Testing for Condition Monitoring of an 11 kV PILC Cable Insulation System

A cable circuit of a substation in the United Kingdom showed high level of PD activities during a survey using hand hold PD testing equipment. The authors were invited to carry out on-site PD testing experiment to further diagnose and locate the potential problem of the cable system. This paper presents the experience of the present authors carrying out the cable test. Following a brief introduction to the experiment equipments and physical connections, the paper analyses the data collected from the testing, including PD pulse shape analysis, frequency spectrum analysis and phase resolved PD pattern analysis. Associated with PD propagation direction identification, PD source diagnosis and localisation was made. Four different types of sensors, which were adapted during the testing, are shown to have different frequency bandwidths and performed differently. Aider comparing the parameters of the sensor and the PD signals detected by individual sensor, optimal PD monitoring bandwidth for cable system is suggested.

利用激光直接驱动冲击波进行压强高为1．6TPa铜的雨贡纽数据测量

2003年度在“神光”Ⅱ上进行了两轮倍频激光直接驱动状态方程实验，取得了较大进展，获得了不错的结果。首次完成了倍频(2w)激光束均匀化系统的设计和研制，在实验中得到应用，结果表明，该系统在测试要求下，基本能满足激光状态方程实验的要求，但在高精度测量测试条件下，尚难获得高质量的平面冲击波，需对列阵透镜束匀滑系统作进一步的优化设计研究，以满足更高精度状态方程实验测量的要求。在倍频激光直接驱动状态方程实验中，利用现有的条纹相机进行了高时间分辨的冲击波信号记录，

New type of groove used to improve friction in roll forging

A FEM model for a failed industrial example of roll forging was established to analyze the generation mechanisms of the mismatch of size and shape of two spring board.To demonstrate the formulation of these defects,the bites condition and contact status between rectangular groove and workpiece during rolling the first and second spring boards were analyzed.Then,a new oval-diamond groove combining oval groove and diamond groove was presented to eliminate these defects.By analyzing field variables under the same deformation degree,the larger friction can be obtained on the contact surface of workpiece and the oval-diamond groove.The physical experiment validates that the oval-diamond groove can eliminate these defects effectively,and the size of part is in good agreement with design requirement.