Combined model of trip mode and destination

This paper analyzes the characteristics of the destination distribution of trips and proposes a stratified sampling strategy for travel mode choice.The stratified sampling strategy can reduce the size of the alternative set;thus,the computation burden of simulation is decreased.Using the stratified sampling strategy,a combined choice model of the trip mode and destination is developed based on the Bayesian theory.Simulations are carried out to verify the proposed model.The results show that the combined choice model of the trip mode and destination can efficiently simulate travelers＇ choice behaviors.Furthermore,the forecasting accuracy of the combined choice model is higher than the one of the gravity model.Therefore,the proposed model is a powerful tool with which to analyze travelers＇ behaviors in selecting the trip mode.

A HALF PLANE CRACK UNDER THREE-DIMENSIONAL COMBINED MODE IMPACT LOADING

The dynamic stress intensity factor history for a half plane crack in an otherwise unbounded elastic body, with the crack faces subjected to a traction distribution consisting of two pairs of suddenly-applied shear line loads is consid- ered. The analytic expression for the combined mode stress intensity factors as a function of time is obtained. The method of solution is based on the application of integral transforms and the Wiener-Hopf technique. Some features of the solutions are discussed and graphical numerical results are presented.

Extreme Responses of An Integrated System with A Semi-Submersible Wind Turbine and Four Torus-Shaped Wave Energy Converters in Different Survival Modes

Offshore wind power is a kind of important clean renewable energy and has attracted increasing attention due to the rapid consumption of non-renewable energy.To reduce the high cost of energy,a possible try is to utilize the combination of wind and wave energy considering their natural correlation.A combined concept consisting of a semi-submersible wind turbine and four torus-shaped wave energy converters was proposed and numerically studied under normal operating conditions.However,the dynamic behavior of the integrated system under extreme sea conditions has not been studied yet.In the present work,extreme responses of the integrated system under two different survival modes are evaluated.Fully coupled time-domain simulations with consideration of interactions between the semi-submersible wind turbine and the torus-shaped wave energy converters are performed to investigate dynamic responses of the integrated system,including mooring tensions,tower bending moments,end stop forces,and contact forces at the Column-Torus interface.It is found that the addition of four tori will reduce the mean motions of the yaw,pitch and surge.When the tori are locked at the still water line,the whole integrated system is more suitable for the survival modes.

A New Fracture Criterion for a Crack under Combined Mode Loading

A new fracture criterion was proposed. The physical explanation of the criterion is that crack will propagate when the minimum strain energy density in iso hoop stress curve reach a critical strength of the material considered. The resulting curve of critical fracture of mixed mode cracks shows that the present fracture is efficient and more accurate than the previous criteria.

Electronic Structure Investigation of 12442 Iron-Based Superconductors Based on Block-Layer Model

Superconducting transition temperature(Tc),as a crucial parameter,exploring its relationship with various macroscopic and microscopic factors helps to understand the mechanism of high-temperature superconductivity from multiple perspectives,aiding in a multidimensional comprehension of high-temperature superconductivity mechanisms.Drawing inspiration from the block-layer structure models of cuprate superconductors,we computationally investigated the interlayer interaction energies in the 12442-type iron-based superconducting materials AkCa_(2)Fe_(4)As_(4)F_(2)(Ak=K,Rb,Cs)systems based on the block-layer model and explored their relationship with Tc.We observed that an increase in interlayer combinative energy leads to a decrease in Tc,while conversely,a decrease in interlayer combination energy results in an increase in Tc.Further,we found that the contribution of the Fe 3d band structure,especially the 3dz2 orbital,to charge transfer is significant.

Experimental Study on Dynamic Mechanical Properties of Sprayed Concrete-Surrounding Rock Combined Body

To investigate the dynamic response problem of the double medium formed by the adherence of sprayed concrete and surrounding rock in the tunnel,a split Hopkinson pressure bar of 75 mm in diameter was adopted at the ages of 3,7 and 10 d.Experimental results showed that dynamic compressive strength and dynamic increase factors(DIF)of the combined bodies increase with the strain rate.With the growth of strain rate,the critical strain of the combined bodies first increases,then deceases.Furthermore,the combined bodies of 3 d reveal the plastic property and brittle property for 7 d and 10 d when the strain rate is over 80/s.The failure characteristic of the sprayed concrete changes from tearing strain damage to crushing damage as the growth of strain rate,and the failure characteristic of rock presents the tensile failure mode as demonstrated by the scanning electron microscope(SEM).

Revisiting ENSO impacts on the Indian Ocean SST based on a combined linear regression method

The El Nino-Southern Oscillation(ENSO)has great impacts on the Indian Ocean sea surface temperature(SST).In fact,two major modes of the Indian Ocean SST namely the Indian Ocean Basin(IOB)and the Indian Ocean Dipole(IOD)modes,exerting strong influences on the Indian Ocean rim countries,are both influenced by the ENSO.Based on a combined linear regression method,this study quantifies the ENSO impacts on the IOB and the IOD during ENSO concurrent,developing,and decaying stages.After removing the ENSO impacts,the spring peak of the IOB disappears along with significant decrease in number of events,while the number of events is only slightly reduced and the autumn peak remains for the IOD.By isolating the ENSO impacts during each stage,this study reveals that the leading impacts of ENSO contribute to the IOD development,while the delayed impacts facilitate the IOD phase switch and prompt the IOB development.Besides,the decadal variations of ENSO impacts are various during each stage and over different regions.These imply that merely removing the concurrent ENSO impacts would not be sufficient to investigate intrinsic climate variability of the Indian Ocean,and the present method may be useful to study climate variabilities independent of ENSO.

Representation of the ENSO Combination Mode and its Asymmetric SST Response in Different Resolutions of HadGEM3

Previous studies have revealed a combination mode （C-mode） occurring in the Indo-Pacific region, arising from nonlinear interactions between ENSO and the western Pacific warm pool annual cycle. This paper evaluates the simulation of this C-mode and its asymmetric SST response in HadGEM3 and its resolution sensitivity using three sets of simulations at horizontal resolutions of N96, N216 and N512. The results show that HadGEM3 can capture well the spatial pattern of the C-mode associated surface wind anomalies, as well as the asymmetric response of SST in the tropical Pacific, but it strongly overestimates the explained variability of the C-mode compared to the ENSO mode. The model with the three resolutions is able to reproduce the distinct spectral peaks of the C-mode at the near annual combination frequencies, but the performance in simulating the longer periods is not satisfactory, presumably due to the unrealistic simulation of the ENSO mode. Increasing the horizontal resolution can improve the consistency between atmospheric and oceanic representations of the C-mode, but not necessarily enhance the accuracy of C-mode simulation compared with observation.

Research on the Combination Mode of Modem Product and Industrial Design under the Green Design Background

In this paper, we conduct research on the combination mode of the modern product and the industrial design under the green design background. Our enterprises must set up the industrial design as the basis of the new mechanism, treatment of product, enterprise and market to trinity, cannot be indifferent to a certain aspect, to every aspect, to attach importance to technology, hard management talents, on the basis of industrial designers should play the role of soft energetically. Industrial design should have good adhesive property, product, enterprise and market more harmonious, more closely linked, creation of the technical performance, reasonable internal structure, a novel appearance, low production cost, a profound cultural products, for the enterprise to bring the most lucrative business profits, and make the market more prosperous more standardized. Under this background, we propose the novel combination pattern that holds special meaning.

白条猪价格预测模型构建

【目的】增强农产品价格预测准确度,为农产品价格的有效预测提供参考。【方法】以河南省白条猪每周平均批发价格为研究对象,提出一种基于序列分解、主成分分析和神经网络(CEEMDAN-PCA-CNN-LSTM)的白条猪价格预测方法。首先,使用自适应白噪声完全集合模态分解方法(CEEMDAN)对白条猪价格序列进行分解;其次,选用皮尔逊相关系数筛选影响价格波动的相关因素;再次,利用主成分分析(PCA)对影响因素及分解得到的子序列降维处理并作为原始价格序列的特征值,并行输入到作为编码器的卷积神经网络(CNN)中进行特征提取;最后,引入长短期记忆网络(LSTM)作为解码器输出得到预测结果。将该方法应用于河南省白条猪每周平均价格数据,与LSTM、门控循环单元(GRU)、CNN、基于卷积的长短期记忆网络(ConvLSTM)模型进行比较。【结果】CEEMDAN-PCA-CNN-LSTM组合模型预测方法得到的平均绝对误差分别降低了44.95%、27.30%、28.13%、43.17%。【结论】CEEMDAN-PCA-CNN-LSTM模型对于河南省白条猪市场价格的预测性能更优,有助于相关部门针对河南省白条猪价格波动做出科学决策。

党建引领视角下医疗卫生人才培养的实践研究

加强党建工作建设,充分发挥党组织领导核心的作用,为医疗卫生教育机构深化医疗人才培养提供坚强保障。在党建引领背景下对医疗卫生人才培养进行探索和研究,构建全员、全方位、全过程育人体系,聚焦党建引领,建强育人队伍,凸显全员育人合力,培养兼具扎实专业理论和综合素质能力的复合型人才成为重要的育人目标。推动党建引领实践育人工作,即有利于强化党对医疗卫生教育机构的领导,还有利于创新党建引领、医疗卫生教育机构主导和社会力量参与的实践育人模式。文章从党建引领,在医疗人才培养的实践探索、实践策略等方面,探索党建引领实践育人策略,以为相关工作提供一定的借鉴和参考依据。

“分合协同”药学硕士专业学位研究生创新人才培养途径探索

针对“新医科”建设背景下药学硕士专业学位研究生培养要求,南京医科大学秉持采用“需求-培养-发展”培养理念,从培养体系、培养环境和培养手段等方面,探索药学硕士专业学位研究生“分合协同”培养途径,在践行药学硕士专业学位研究生培养过程中取得了一定成效。

角钢塔螺栓的紧固控制技术

针对角钢塔螺栓紧固作业需求,研究了一种轻量化、扭矩可准确控制的电动扳手.为了解决轻量化问题,提出了一种自抗扰控制器与滑模观测器融合算法,实现了无扭矩传感器的电动扳手扭矩参数估计与控制.首先,将自抗扰控制器引进扭矩环、速度环,在对其总扰动量进行估计的同时得到角加速度的估计值,然后将该角加速度值作为二阶滑模观测器的输入进行紧固扭矩值的估计,解决了二阶滑模观测器中变量的导数值难以获得的问题.仿真和实验结果表明,与传统PID控制器、滑模控制器相比,所提方法可实现扭矩的准确估计,具有扭矩调节时间短,超调小的特点.

基于改进金豺算法的短期负荷预测

针对电力负荷序列波动性和预测精度不高的问题,提出一种基于变分模态分解、排列熵和改进金豺算法优化双向长短期记忆网络的预测模型。首先,利用变分模态分解重构原始负荷序列,再采用排列熵理论对分解后的子序列进行熵值重组;然后,利用改进金豺算法对双向长短期记忆网络的参数进行优化,并对每个子序列建立预测模型;最后,组合各模型结果得到最终预测值。实验结果表明,本文模型预测精度更高,与真实值拟合度更好。

动态气门运行特性及二冲程制动性能耦合研究

基于自主研发的变模式气门驱动装置,进行发动机和该气门驱动装置联合仿真,研究了二者的强耦合运行特性,为该装置的装机应用提供理论依据.研究结果表明:缸内压力和气门运行之间的强耦合关系在上止点附近排气门运行阶段尤为明显,尤其是在2300 r/min以下,发动机转速越高,气门动态升程损失程度越大,最大缸内压力越高;高于该转速后,二者变化程度逐渐减小;排气制动凸轮在上止点后设置过渡升程可消除排气门反跳的问题,并且可进一步改善制动功率和最大缸内压力之间的矛盾关系;与理想四冲程制动相比,二冲程制动的制动功率明显增加,最大缸内压力明显降低,发动机转速分别为1600、1900和2400 r/min时,实际二冲程制动功率分别提高了35.94%、45.61%和27.54%,最大缸内压力分别降低了45.42%、27.20%和7.35%.

线下线上混合式教学模式在机械原理教学中的应用

为适应工程教育认证,切实提高机械原理课程的学习效果,机械原理课程教学方法和教学内容等需要进行相应教学改革。课题组以成果导向为指导理念,优化教学内容;以“学习通”、腾讯会议、QQ群为平台,开展线下线上混合式教学模式,以机械原理“自由度计算基本公式”专题为例开展教学设计,探索线下线上混合教学模式的应用。结果表明,混合式教学模式能有效增加教学内容,激发学生自主学习的兴趣和能力,达到“童蒙求我”的学习效果。

基于极点对称模态分解的中长期径流预报组合模型

为提高径流预报精度,解决径流序列分解后高频分量波动范围大、预报精度差的问题,基于极点对称模态分解法(ESMD)平稳化处理技术将径流序列分解,通过分析不同频率分量特征,择优选取预报方法,结合粒子群优化最小二乘支持向量机(PSO-LSSVM)全局优化和非线性建模能力及适应性强的特点,对高频分量进行预测,利用BP神经网络非线性映射能力和逼近任意非线性函数的优势对中低频分量和趋势分量进行预报,构建了ESMD-PSO-LSSVM-BP组合预报模型,对西江干流上中下游三座水文站的年、月尺度径流开展中长期径流预报。结果表明,对不同频率分量采用不同预报方法的组合模型可以有效提高径流预报精度。

“院院合一”体制下学生思想工作新路径探讨

思想政治教育是培养合格医疗卫生人才的重要保障,医学院校附属医院是承担救死扶伤医疗工作和临床教学双重职责的重要场所。为提高人才培养质量,临床医学院与附属医院实施“院院合一”管理体制,发挥附属医院主体职能,对新体制下医学生思想政治工作路径进行了积极有效探索,建立新体制下以医学生理想信念培育为引领、以职业道德培育为保障、以社会服务意识培育为目标的医学生思想政治工作新路径,以培养医德高尚、医术精湛的医学人才,体现附属医院医疗与教学的责任担当。

“数字信号处理”课程中的以渔易鱼

“数字信号处理”是信息类专业中的一门主干基础课,但在教学过程中,经常会遇到学生学习效果不佳、学习动力不足等问题。为了改善这些现状,结合五邑大学实际情况,从教学内容、教学方式、仿真实践等三个方面进行了改革探索,目的是通过理论与实际的结合改善该课程的学习现状,强调知识点的掌握,更重视培养学生的工科学习思维。期望通过以渔易鱼的方式,拓宽学生的工程视野,提高学生的学习兴趣,培养工程的思维方式。

职住学空间测度及儿童通学决策的影响机理——以昆明市双职工家庭为例

当代城市家庭选择居住地时往往将临近学校作为重要参考,在缩小学住距离的同时加剧了职住分离。选取昆明市561个有学龄儿童的双职工家庭为研究对象,分析家庭空间分异对儿童通学决策的影响。首先,基于时间地理学理论构建考虑职住学三个锚点的家庭活动空间及测度理论模型。其次,根据测度结果将家庭活动空间划分为职住学就近型和职住学分离型两类。最后,建立结构方程模型分别探究两种模式下父母工作时长以及父母儿童组合时间窗对儿童通学时空行为的影响。研究结果表明:相对于学住距离,父母的职住距离和工作时长对通学行为的影响更为显著,因此就近入学政策对于促进儿童步行上学的作用有限;对于职住学分离型家庭,父母下班与儿童放学组合时间窗的宽裕程度对儿童出行影响显著,组合时间窗越宽裕,儿童小汽车出行的可能越大,因此弹性放学时间的效果也有待商榷;儿童在通学行为中的性别差异主要在职住学分离型家庭中体现。