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Search Results: 1 - 10 of 1103 matches for " 溪 "
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非结构化对等网络中信息检索策略研究
Information Retrieval Strategy on Unstructured Peer-to-Peer Network
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Hans Journal of Data Mining (HJDM) , 2011, DOI: 10.12677/hjdm.2011.12005
Abstract: 非结构化对等网络(P2P)是共享系统的主要实现方式,但是由于搜索的盲目性,其检索效率又普遍低下。本文将聚类域和语义分组引入到非结构化对等网络搜索技术中,结合非结构化对等网络中的洪泛搜索机制,提出了基于语义聚类的资源搜索策略。仿真实验的结果表明,该系统所采用的信息检索策略能够有效地提高信息检索的查询成功率,降低网络负载,取得了良好的效果。
Unstructured peer-to-peer network (P2P) is the main way to implement shared system, but retrieval efficiency is generally low due to search of blindness. In this paper, a new approach to information retrieval based on unstructured P2P systems is presented, by using clustering domain and grouped P2P network based on semantic. The results show that the searching mechanism has good performances on the search success rate and load balancing.
汽车共享的成本结构分析
The Analysis of Cost Structure of Car Sharing
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Open Journal of Transportation Technologies (OJTT) , 2013, DOI: 10.12677/OJTT.2013.22026
Abstract:
随着社会经济的不断发展,一系列社会问题慢慢呈现出来,从而影响人们的日常生活,比如交通拥堵、停车难问题。随着交通问题的日益严峻,欧美国家率先出现了一种新的出行方式——“汽车共享”。论文首先介绍汽车共享的概念,然后从汽车共享与拥有私家车的两种方式进行利与弊对比说明入手,引入固定成本和可变成本的概念,区分汽车共享模式和拥有私家车两者的成本结构,进行简单的数据分析,比较了两者的成本。
With the continuous development of the socio-economic, a series of questions slowly revealed to affect people’s daily lives, such as traffic congestion, parking difficulties. As traffic problems is becoming increasingly severe, a new travel way, so-called “car sharing” firstly appeared in Europe and America. This paper firstly introduces what is car sharing, then compares the advantages and disadvantages of car sharing and holding private cars. Then, a comparison is made in the cost structure of car sharing and holding private cars with the help of the concept of fixed cost and variable cost. Finally, their cost is compared through simple data analysis.
院内创伤评分的研究进展
The Research Progress of Hospital Trauma Score
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颜琦, 李德
Advances in Clinical Medicine (ACM) , 2015, DOI: 10.12677/ACM.2015.53026
Abstract:
在现代社会中,随着经济与科技的发展,创伤的种类与数量呈递增之势,自上世纪70年代以来,人们为了能够更好的判断伤情,更及时有效的救助患者,提出了希望将创伤数字化,以便更科学、高效评定创伤的程度及预后,创伤评分应运而生,经过30余年的努力发展,现已面世了多种院内创伤评分方法,并广泛应用于临床与科研,但在实际操作中各种评分方法又各有利弊。本文就目前几种常见的院内创伤评分方法进行综述,重点介绍其临床应用及意义。
With the economical and technological development in the modern society, both the types of trauma and the number of people affected by trauma have been escalating. Since the 1970s, in or-der to better assess the traumatic condition so as to rescue the patients more effectively and timely, trauma scoring was developed in response to the demand for visualization of trauma for a more scientifically sound and efficient assessment of the severity and prognosis of trauma. After more than 30 years with the development of the field, various hospital-based trauma scoring systems have emerged and been used extensively in clinical practice and scientific research. However, these scoring systems have their own advantages and disadvantages. This paper provides an overview of several trauma scoring systems that are commonly used in hospitals, with the emphasis on their clinical application and significance.
红外量子阱探测器研究进展

红外 , 1995,
Abstract:
企业技术创新策略

科技进步与对策 , 1995,
Abstract: 企业技术创新策略技术管理
摘除花瓣防治日光温室番茄灰霉病试验
田 
北方园艺 , 2010, DOI: 10.11937/bfyy.201020030
Abstract:
纤维单胞菌fimi的纤维素酶基因在大肠杆菌中分子克隆(重组dna:pbr322质粒;免疫检测)

中国生物工程杂志 , 1984,
Abstract: 建立了一个灵敏简单的免疫检测方法来筛选经带有纤维素酶基因的重组dna质粒转化的大肠杆菌,用以鉴定至少带有一个来自纤维单胞菌属fimi的纤维素酶基因的重组dna质粒。还原糖的产生表明,带有此种质粒的大肠杆菌提取物中的酶具有羧甲基纤维素的水解催化活性。
出行分布矩阵的极大熵估计法比较研究
Compare of the Estimation Method of Matrix Based on Maximum Entropy Model
 [PDF]

胡文君,
Open Journal of Transportation Technologies (OJTT) , 2013, DOI: 10.12677/OJTT.2013.22027
Abstract:
极大熵方法是用于估计起讫点间出行分布矩阵的一种高效简便的方法。在介绍基础极大熵公式的形式和原理后,应用Stirling近似公式和对数近似公式简化基本极大熵公式,得出六个改进的极大熵公式,在总出行需求固定或可变、先验OD矩阵可行或不可行、节点流连续条件满足或不满足的三种不同的情况下在两个网络上测试七个极大熵公式,对其特征进行比较。结果表明七个目标函数在寻优时表现出一致性,但是在一些特定的情况下,有几个公式产生较大误差,使得其在实际使用中受到限制
Maximum Entropy model is an efficient and simple model to estimate origin destination matrix. After introducing the formation and principle of basic maximum entropy model, this article uses Stirling approximate formula and log sum approximate formula to simplify basic model and obtains six improved models. Then it tests seven models in two networks under three different conditions, namely the total demand is fixed or unfixed, the prior matrix is feasible or unfeasible and the node continuity condition is satisfied or unsatisfied and compare the properties of these models. The results show that they show uniform in searching for optimum solutions. However, several formations produce large errors under some circumstances, which restrict their applications in reality.
PAC水解形态分布规律在膜污染控制上的应用
PAC Hydrolysis Form Distribution Rule in the Application of Membrane Pollution Control
 [PDF]

Mihret DanantoUlsido, 李孟,
Water pollution and treatment (WPT) , 2016, DOI: 10.12677/WPT.2016.42005
Abstract:
随着水体污染的日趋严重,传统的净水工艺无法有效处理微污染水源。膜作为水处理中过滤屏障,可以截留大部分污染物以及99.9%的微生物,但由于水中溶质与膜材料之间相互作用会造成膜污染。通过Al-Ferron法研究聚合金属盐混凝剂的形态分布规律及其对膜污染的控制效果,结果发现铝盐水解形态中Alb形态占主导地位,AlT的总量减少,且经膜过滤后仅含少量的Alc,说明膜的截留效果比较好,另外膜的酸洗会比碱洗效果好,可以有效的减缓膜污染。
With the increasingly serious water pollution, the traditional water purification process cannot effectively deal with slightly polluted water. Membrane, as a filter in water treatment, can intercept most pollutants and 99.9% of the microorganisms. However, membrane pollution occurs frequently due to the interactions between the solute and membrane with water flowing. In this paper, Al-Ferron process was utilized to investigate the morphological distribution of metal salt coagulants and improvement performance. Experimental results showed that in all forms of aluminum salt, Alb accounted for the most part, while the amount of AlT unfortunately reduced. Only a small part of Alc left after the filtration, which verified the good interception performance of membrane. In addition, membrane pickling will be more appropriate for slowing the membrane fouling than alkaline cleaning.
面向排放量化的低速区间机动车比功率分布特性与模型
,宋国华,于雷
环境科学学报 , 2014,
Abstract: 随着排放建模方法从基于行驶周期和平均速度演变为基于VSP(VehicleSpecificPower)参数,利用VSP分布刻画交通状态成为最新的研究需求.近期研究中,针对城市快速路上大于20km·h-1的速度区间建立了基于平均行程速度的VSP分布数学模型,却未对低速区间的VSP分布特征作深入研究.基于北京快速路大量逐秒浮动车数据,研究0~20km·h-1的VSP分布与平均行程速度的关系.通过分析大量逐秒浮动数据的VSP分布与平均速度间关系,发现VSP分布与平均行程速度具有规律性:各VSP分布的峰值出现在VSPBin=0处,且随速度的增加单调递减.因此,针对VSP分布的正、负区间以及VSPBin=0处分别建立数学模型,并利用该模型进行机动车油耗/排放测算.对比分析油耗/排放的预测值和实测值得出,所建立的VSP分布模型可以有效用于机动车油耗/排放测算.
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