宁夏水资源情势分析及应对策略

一、宁夏水资源现状及特点 宁夏地处西北干旱内陆．降水稀少,水资源严重短缺。当地人均占有水资源量仅为黄河流域的1／3、全国的1／12,人均水资源可利用量仅有670m^3,为全围平均值的1／3,呈现资源型、丁程型和水质型缺水并存的局面。     

Multiconsensus of second order multiagent systems with directed topologies

A novel multiconsensus problem is introduced in multiagent systems. The states of multiple agents in each subnetwork asymptotically converge to a consistent value with information exchanges among subnetworks. The multiconsensus problem of second order multiagent systems with directed topologies is studied. Three linear protocols are proposed to solve the multiconsensus problem. Necessary and sufficient conditions are derived based on matrix theory. Simulations are provided to demonstrate the effectiveness of the theoretical results.     

Partial standard quantum process tomography

With the general theory of standard quantum process tomography, we shall develop a scheme to decide an arbitrary matrix element of χ, which is in the Choi matrix representation, in a scalable way. Our observation is that: To decide the diagonal matrix element, one just needs a single measurement; To decide an arbitrary off-diagonal matrix element, we should carry out sixteen measurements. This result is independent of the actual dimension of the system. Compared with the known methods of partial QPT, our scheme does not require any additional resources. It can be applied for the case where a clean ancilla system is not available.     

新生报名系统设计模型

随着各个院校规模的增大和多元化发展,原有新生管理工作变得更复杂.目前我国高职院校的新生报名管理,基本上都是靠人工进行,工作量大、效率低,各部门数据独立,不能共享,利用管理信息系统MIS对新生报到工作进行计划、管理和决策分析已成大势所趋.     

数据集成的应用

目前国内大多数企事业单位还仅停留在服务于单个系统的多对一架构数据集成应用,这种数据集成架构方法严重制约了企业信息化管理效率,以及数据共享性.本文通过分析新时期企业数据业务的变化,阐述了企业单位数据管理 的架构体系以及在这些架构体系下的系统实现方法.     

异常数据挖掘在实际中的应用

本文主要讨论了异常数据挖掘在实际中的应用,简要地介绍了异常点的定义、分类及异常数据挖掘的定义、功能等,详细的介绍了异常数据挖掘技术在金融领域、电信领域、商业领域中和生物医学以及DNA分析中的应用。     

高职院校《计算机应用基础》课程教学方法的探索

在计算机日益普及的今天,高职院校《计算机应用基础》课程应如何定位？如何实施教学以达到教学目标？我们应以学生为中心,根据高职生计算机知识结构与应用能力的要求来确定适当的教学内容,选择恰当的教学方法、合适的教学步骤,安排充足的练习时间,加强实践技能培养,改革考核方法。     

Retrieving ocean surface current by 4-D variational assimilation of sea surface temperature images

In this article we propose a new method to estimate ocean mesoscale structures of the surface current velocity by processing sea surface satellite images. Assuming that the intensity level can be described by a transport-diffusion equation, the proposed approach is based on variational assimilation of image observations within a simple transport-diffusion model. This approach permits to retrieve the current velocity field from a sequence of satellite images. Results of processing synthetic data and real NOAA-AVHRR satellite images are presented and commented.     

Truth-Telling Reservations

We present a mechanism for reservations of bursty resources that is both truthful and robust. It consists of option contracts whose pricing structure induces users to reveal the true likelihoods that they will purchase a given resource. Users are also allowed to adjust their options as their likelihood changes. This scheme helps users save cost and the providers to plan ahead so as to reduce the risk of under-utilization and overbooking. The mechanism extracts revenue similar to that of a monopoly provider practicing temporal pricing discrimination with a user population whose preference distribution is known in advance.     

An atomistic-continuum inhomogeneous material model for the elastic bending of metal nanocantilevers

The equivalent elastic modulus of nanocantilever can be obtained using atomistic simulation. However, the use of this modulus to predict the bending of nanocantilever results in significant error compared with direct atomistic simulation. The error originates from the surface effect. In our current work, the nanocantilever is considered as an inhomogeneous continuum material. The distributions of materials parameters at the cross-section, such as atomistic elastic constants, are calculated from atomistic simulations. These atomistic-information-based materials parameters are used as inputs to continuum model. A numerical example case validates the presented model and methodology. To correctly predict the structure-property relations of elemental nano-structures are very important for the design of nano-devices. Our continuum model includes nano-effects and provides another way to study nanomechanics.