水文资料人工测验数据处理系统设计与应用

为了提高水文测验数据填报整编工作的准确性和效率,基于B/S(Browser/Server)结构设计了水文测验资料人工测验数据处理系统,可对数据填报进行自动校验计算后直接进入过渡数据库,参与水文资料实时在线整编。该系统包含数据填报、数据校验、数据计算、数据检索与入库等功能。在云南省各水文站的应用表明,系统实现了人工测验项目资料的"日清月结",节省了大量时间和人力,能够满足经济社会发展对水文资料时效性的要求。

黄河水文测验数据在线处理系统设计与应用

为实现黄河水文人工测验数据的数字化,解决自动监测数据的摘录与格式转换等资料整编难题,基于B/S结构构建黄河水文测验数据在线处理系统,设计水文测验原始资料库表结构,可对人工测验数据进行在线录入与计算、自动监测数据进行在线摘录与整编格式转换后,直接存储于水文测验原始资料数据库中,对数据库中的水文测验原始数据还可按照制定的审查规则进行数据的自动审查,检查其合理性。系统在黄河水文河南测区1 a多的运行表明:系统符合基层水文站的测算需求和使用习惯,不但提高人工测验数据的准确率与记载格式的规范度,也提升自动监测数据的摘录与数据格式转换的工作效率,可实现水文测验数据的“日清月结”。

嘉兴独山港近岸海域水文泥沙测验数据分析

本文基于2018年4月24日至5月1日期间嘉兴独山港近岸海域的大、中、小三个代表潮的全潮水文泥沙测验数据,探讨独山港区的水文泥沙特征,为相关的工程建设和研究工作提供必要的水动力条件基础认识。

基于水位流量单值化处理的测验条件分析

本文分析了流域、环境等影响下的水位流量单值化处理过程,通过对各基本水文测站流量影响关键因素的探究,寻求水位流量单值化处理下测验的共同条件,形成特定关系、促进测验成果转化,为水文巡测提供技术支撑。

网络大数据基准测试程序拟定与探讨

利用基准测验流程来检验计算机装置处理数据的性能表现是目前采用的主要方式,但是,至今还没有一个成熟完善且被业界普遍遵循的基准检验方案问世,特别是悄然而至的大数据涌潮给当今社会带来了更为艰巨的问题,为求得较理想的测验方案,本文依托具体的大数据平台拟定了一套Hadoop系统的交通事务大数据基准捡验流程.经挑捡若干个属性等级的项目,把流程内容特点进行数量化处理,并选取以同类相聚的计算方法,评估每一个流程的输进参数集合的近似程度,参照类别聚集情况,给基准测验确定了典型的流程及输进参数集合.最终,经过实践检验证明,该基准测验在符合流程内容广泛性的前提下,彻底去掉了基准测验集合中的多余成分.

某部3583名新兵的人格特征及数字搜索能力调查分析

目的：了解某部队入伍新兵的人格特征及数字搜索能力，为进一步的心理健康服务提供指导。方法采用卡特尔16种人格因素问卷（16PF）及数字搜索能力测验对某部3583名入伍新兵进行测查，将测查结果与全军士兵常模进行比较并分析与数字搜索能力的相关性。结果新兵16PF主要因素中乐群性、聪慧性、稳定性、恃强性、兴奋性、有恒性、敢为性、世故性、实验性、自律性和次级因素中内向与外向型、感情用事与安详机警型、心理健康、专业成就个性及新环境成长能力得分高于常模（ P〈0.01）；主要因素中敏感性、怀疑性、幻想性、忧虑性、独立性、紧张性和次级因素中适应与焦虑型、怯懦与果断型及创造能力个性得分低于常模（ P 〈0.01）。数字搜索测验得分与16PF 聪慧性、稳定性、恃强性、兴奋性、有恒性、敢为性和自律性得分呈正相关（P〈0.05，P〈0.01）；与怀疑性、世故性、忧虑性和紧张性得分呈负相关（P〈0.01）。结论该部队新兵具有相对健全、良好的人格特征，数字搜索能力测验与人格测验结果间的相关关系微弱。

Path Analysis on the Meteorological Factors Impacting Soil Respiration Rate of Wheat Field

[Objective]The experiment aimed to study the effects of meteorological factors under different weather conditions on soil respiration. [ Method] The path analysis was used to analyze meteorological factors which influenced soil respiration of wheat field under different weather condition and at jointing stage. [ Result] In sunny day, the correlations between ground temperature at 5 cm, solar radiation, air relative humidity, air temperature and soil respiration were all at significant level while solar radiation and ground temperature at 5 cm were the major factors which influenced soil respiration. In cloudy day, solar radiation was a major factor which influenced soil respiration.[ Conclusion] The soil respiration and surplus path coefficient in sunny day were all higher than these in cloudy day, which demonstrated that except influenced by ground temperature, air temperature, solar radiation and air relative humidity, the soil respiration was also influenced by other factors especially biological factor.

平原河道桥梁建设对附近水文站的影响分析

平原河道坡降小,水流较缓,如果在其上建桥,桥墩又必须设在河道内,由于桥墩的阻水作用,桥上游侧可能会产生壅水,下游侧则可能产生跌水,引起桥周围一定范围内水位、流速、流量及整个流场的改变。如果桥上、下游附近有水文站,则可能改变水文站测量数据系列的一致性及已建立的水位、流量关系,降低测量数据的精度,甚至影响水文站正常测验工作的实施。因此,必须分析建桥对水文站的影响程度,判断在该河道位置建桥的可行性。

Retrograde-viewing device improves adenoma detection rate in colonoscopies for surveillance and diagnostic workup

AIM:To determine which patients might benefit most from retrograde viewing during colonoscopy through subset analysis of randomized,controlled trial data.METHODS:The Third Eye Retroscope Randomized Clinical Evaluation(TERRACE) was a randomized,controlled,multicenter trial designed to evaluate the efficacy of a retrograde-viewing auxiliary imaging device that is used during colonoscopy to provide a second video image which allows viewing of areas on the proximal aspect of haustral folds and flexures that are difficult to see with the colonoscope's forward view.We performed a post-hoc analysis of the TERRACE data to determine whether certain subsets of the patient population would gain more benefit than others from use of the device.Subjects were patients scheduled for colonoscopy for screening,surveillance or diagnostic workup,and each underwent same-day tandem examinations with standard colonoscopy(SC) and Third Eye colonoscopy(TEC),randomized to SC followed by TEC or vice versa.RESULTS:Indication for colonoscopy was screening in 176/345 subjects(51.0%),surveillance after previous polypectomy in 87(25.2%) and diagnostic workup in 82(23.8%).In 4 subjects no indication was specified.Previously reported overall results had shown a net additional adenoma detection rate(ADR) with TEC of 23.2% compared to SC.Relative risk(RR) of missing adenomas with SC vs TEC as the initial procedure was 1.92(P = 0.029).Post-hoc subset analysis shows additional ADRs for TEC compared to SC were 4.4% for screening,35.7% for surveillance,55.4% for diagnostic and 40.7% for surveillance and diagnostic combined.The RR of missing adenomas with SC vs TEC was 1.11(P = 0.815) for screening,3.15(P = 0.014) for surveillance,8.64(P = 0.039) for diagnostic and 3.34(P = 0.003) for surveillance and diagnostic combined.Although a multivariate Poisson regression suggested gender as a possibly significant factor,subset analysis showed that the difference between genders was not statistically significant.Age,bowel prep quality and withdrawal time did not significantly affect the RR of missing adenomas with SC vs TEC.Mean sizes of adenomas detected with TEC and SC were similar at 0.59 cm and 0.56 cm,respectively(P = NS).CONCLUSION:TEC allows detection of significantly more adenomas compared to SC in patients undergoing surveillance or diagnostic workup,but not in screening patients(ClinicalTrials.gov Identifier:NCT01044732).

New double yield surface model for coarse granular materials incorporating nonlinear unified failure criterion

A new double-yield-sarface （DYS） model was developed to characterize the strength and deformation behaviors of coarse granular materials （CGMs）. Two kinds of deformation mechanisms, including the shear and compressive plastic deformation, were taken into account in this model, These two deformation mechanisms were described by the shear and compressive yield functions, respectively. The Lode angle dependent formulations of proposed model were deduced by incorporating a 3D nonlinear unified failure criterion. Some comparisons were presented between the numerical predictions of proposed model and test data of true triaxial tests on the modeled rockfills. The model predictions are in good agreement with the test data and capture the strain hardening and plastic volumetric dilation of CGMs. These findings verify the reasonability of current DYS model, and indicate that this model is well suited to reproduce the stress-strain-volume change behavior of CGMs in general.

水文站巡测优化分析探究

通过分析水文测站巡测方案形成因素、条件,水文要素之间的测定形成规律,统筹量化测验区域环境影响因子,提出巡测方案的初步优化方法,可为水文地域巡测提供决策参考。

Influence of Tacking Sequence on Residual Stress and Distortion of Single Sided Fillet Submerged Arc Welded Joint

Submerged arc welding （SAW） is advantageous for joining high thickness materials in large structure due to high material deposition rate. The non-uniform heating and cooling generates the thermal stresses and subsequently the residual stresses and distortion. The longitudinal and transverse residual stresses and angular distortion are generally measured in large panel structure of submerged arc welded fillet joints. Hence, the objective of this present work is to quantify the amount of residual stress and distortion in and around the weld joint due to positioning of stiffeners tack. The tacking sequence influences the level of residual stress and proper controlling of tacking sequences is required to minimize the stress. In present study, an elasto-plastic material behavior is considered to develop the thermo mechanical model which predicts the residual stress and angular distortion with varying tacking sequences. The simulated result reveals that the tacking sequence heavily influences the residual stress and deformation pattern of the single sided fillet joint. The finite element based numerical model is calibrated by comparing the experimental data from published literature. Henceforth, the angular distortions are measured from an in-house developed experimental set-up. A fair agreement between the predicted and experimental results indicates the robustness of the developed numerical model. However, the most significant conclusion from present study states that tack weld position should be placed opposite to the fillet weld side to minimize the residual stress.

Experimental analysis on bolt interference during advanced water detection with the mine transient electromagnetic method

During advanced water detection using the transient electromagnetic method, the exploration effect for water-rich area is often poor due to the interference of bolts that are distributed in different positions in working face. Thus, the study on the interference characteristics of bolts in different states has important directive significance for improving the acquisition quality and data processing method in water detection. Based on the analysis of the distribution laws of magnetic field excited by small multi-turn coincident loop in full space of homogeneity, the test on the interference of bolts has been designed in the mine. Through drilling 18 holes around the overlapping coil in the working face, mass data are collected in order with the posi- tion change and the exposed bolt length. The results of comprehensive data analysis show that the transient electromagnetic field is strongly interfered as the distance between the bolt and the center of the coil is less than 3 m, and the interference varies greatly as the distance varies. On the other hand, the field induced by the bolts can be ignored as the distance exceeds 3 m. The findings can help to improve data acquisition and correction during advanced water detection when using the transient electromagnetic method.

Determination of metastable zone and induction time of analgin for cooling crystallization

The solubility, metastable zone width, and induction time of analgin for unseeded batch cooling crystallization in ethanol–aqueous system were experimentally determined. The solubility data could be well described by the van't Hoff equation model. The metastable zone width at various cooling rates was measured, and some parameters of nucleation kinetic were calculated using the Ny'vlt theory. Furthermore, the induction period of various temperatures and supersaturation ratios was also measured. According to classical nucleation theory, some nucleation parameters and interfacial energy was calculated through the induction time(t_(ind)) data. Homogeneous nucleation tended to occur when the supersaturation is high, whereas heterogeneous nucleation was more likely to occur when the supersaturation is low.

Prediction of Henry's constant in polymer solutions using PCOR equation of state coupled with an activity coefficient model

In this paper,the polymer chain of rotator(PCOR) equation of state(EOS) was used together with an EOS/G^E mixing rule(MHV1) and the Wilson's equation as an excess-Gibbs-energy model in the proposed approach to extend the capability and improve the accuracy of the PCOR EOS for predicting the Henry's constant of solutions containing polymers.The results of the proposed method compared with two equation of state(van der Waals and GC-Flory) and three activity coefficient models(UNIFAC,UNIFAC-FV and Entropic-FV) indicated that the PCOR EOS/Wilson's equation provided more accurate results.The interaction parameters of Wilson's equation were fitted with Henry's constant experimental data and the property parameters of PCOR,a and b,were fitted with experimental volume data(Tait equation).As a result,the present work provided a simple and useful model for prediction of Henry's constant for polymer solutions.

Vapor Pressure Measurement and Correlation of 2-Methyl-Butanol Acetate Containing Calcium Chloride

The CaCl2 solubility in 2-methyl-butanol acetate and the vapor pressure of 2-methyl-butanol acetate containing CaCl2 were measured in the range of 90-135°C and from very low salt concentration to saturation.The experimental data were correlated with two equations,a modified Antoine equation with the dissolved salt taken into account and a nonrandom two liquid-electrolyte（e-NRTL）model.Both models are in good agreement with the experimental data.This study provides essential physical data for further investigation of vapor-liquid equilibrium system containing salt.

Analytic model of non-uniform corrosion induced cracking of reinforced concrete structure

In order to perfectly reflect the dynamic corrosion of reinforced concrete (RC) cover in practical engineering,an analytic model of non-uniform corrosion induced cracking was presented based on the elastic-plastic fracture mechanics theory.Comparisons with the published experimental data show that the predictions given by the present model are in good agreement with the results both for natural exposed experiments and short-time indoor tests (the best difference is about 2.7%).Also it obviously provides much better precision than those models under the assumption of uniform corrosion (the maximal improved precision is about 48%).Therefore,it is pointed out that the so-called uniform corrosion models to describe the cover cracking of RC should be adopted cautiously.Finally,the influences of thickness of local rusty layer around the reinforcing steel bar on the critical corrosion-induced crack indexes were investigated.It is found that the thickness of local rusty layer has great effect on the critical mass loss of reinforcing steel,threshold expansion pressure,and time to cover cracking.For local rusty layer thickness with a size of a=0.5 mm,the time to cover cracking will increase by about one times when a/b (a,semi-minor axis;b,semi-major axis) changes from 0.1 to 1 mm.

Understanding BitTorrent Through Real Measurements

In this paper, we present the resuks of the BitTorrent measurement study. Two sources of BitTorrent data were utilised： meta- data files and the logs of one of the currently most popular BitTorrent clients--gTorrent. Experimental data were collected for fifteen days from the popular torrent-discovery site thepiratebay.org （more than 30 000 torrents were captured and analysed）. During this pe- riod the activity and logs of an unmodified version of μTorrent client downloading ses- sions were also captured. The obtained ex- perimental results are swarm-oriented, which allows us to look at BitTorrent and its users from an exchanged resources perspective. Moreover, comparative analysis of the clients＇ connections with and without the μTP proto- col is carried out to verify the extent to which μTP improves BitTorrent transmissions. To the authors＇ best knowledge, none of the previous studies have addressed these issues.

The weak form market efficiency investigation of American, European and Asian stock markets

This paper investigates the empirical validity of the Weak Form Efficient Market Hypothesis for American, European and Asian stock markets. Random Walk Hypothesis is used to prove weak form efficiency in American, European and Asian stock indices. ADF and PP Unit Root Tests have been used to test unit root in time series of daily data of American, European and Asian stock indices. Results show that sample of stock markets are weak-form efficient in terms of the Random Walk Hypothesis.

Investigation of Flow in Data Rack

The main purpose of this paper was to set up a functioning numerical model of data rack verified by an experimental measurement. The numerical model will serve for the flow simulation inside the data rack. For the aim of experimental verification of the server model, a PIV （particle image velocimetry） method was used. The server model was projected based on the original Rack Workstation Dell Precision 17,5400 （2U rack space）. The flow rate in each channel was implemented with the help of pressure loss, which was set up so that the server flow rate corresponded with the measured values. The verification of the correct functioning of the numerical model of the server was carded out together with verifying the numerical model of a small data rack. The experiment was compared with the numerical model for the case of data rack （12U rack space） fitted with two 2U rack workstations Dell Precision R5400, on which the simulation of several phases of the entire data rack with given configuration was carried out.