共查询到20条相似文献，搜索用时 102 毫秒
1.
The effects of the concentration of dissolved total organic carbon(TOC),the TOC/Br-ratio,bromide ion levels,the chlorine to ammonia-N ratio(Cl:N),the monochloramine dose and the chlorine dose on the formation of trihalomethanes(THMs)(including chloroform,bromodichloromethane,chlorodibromomethane,and bromoform)from chlorination were investigated using aqueous humic acid(HA)solutions.The profile of the chloramine decay was also studied under various bromide ion concentrations.Monochloramine decayed in the presence of organic material and bromide ions.The percentage of chloroform and brominated THMs varied according to the TOC/Br-ratio.Total THMs(TTHMs)formation increased from 112 to 190 μg/L with the increase concentrations of bromide ions from 0.67 to 6.72 mg/L,but the chlorine-substituted THMs were replaced by bromine-substituted THMs.A strong linear correlation was obtained between the monochloramine dose and the formation of THMs for Cl:N ratios of 3:1 and 5:1.These ratios had a distinct effect on the formation of chloroform but had little impact on the formation of bromodichloromethane or chlorodibromomethane.The presence of bromide ions increased the rate of monochloramine decay. 相似文献
2.
A detailed experiment of 1-pixel bit reconfigurable ternary optical processor (TOP) is proposed in the paper. 42 basic operation
units (BOUs) and 28 typical logic operators of the TOP are realized in the experiment. Results of the test cases elaborately
cover the every combination of BOUs and all the nine inputs of ternary processor. Both the experiment process and results
analysis are given in this paper. The experimental results demonstrate that the theory of reconfiguring a TOP is valid and
that the reconfiguration circuitry is effective. 相似文献
3.
In this paper an overall scheme of the task management system of ternary optical computer (TOC) is proposed, and the software
architecture chart is given. The function and accomplishment of each module in the system are described in general. In addition,
according to the aforementioned scheme a prototype of TOC task management system is implemented, and the feasibility, rationality
and completeness of the scheme are verified via running and testing the prototype. 相似文献
4.
The division operation is not frequent relatively in traditional applications, but it is increasingly indispensable and important
in many modern applications. In this paper, the implementation of modified signed-digit (MSD) floating-point division using
Newton-Raphson method on the system of ternary optical computer (TOC) is studied. Since the addition of MSD floating-point
is carry-free and the digit width of the system of TOC is large, it is easy to deal with the enough wide data and transform
the division operation into multiplication and addition operations. And using data scan and truncation the problem of digits
expansion is effectively solved in the range of error limit. The division gets the good results and the efficiency is high.
The instance of MSD floating-point division shows that the method is feasible. 相似文献
5.
Mobility and resource-limitedness pose challenging issues to service configuration for quality of service （QoS） management in ubiquitous computing environments. Previous configuration approaches, such as static resource reservation, dynamic resource allocation and single service composition are not valid in the environments. In this study, we present an adaptive service configuration approach. Firstly, we reduce the dynamic configuration process to a control model which aims to achieve the variation of critical QoS on minimal level with less resource cost. Secondly, to deal with different QoS variations, we design two configuration strategies--service chain reconfiguration and QoS parameter adjustment--and implement them based on fuzzy logic control theory. Finally, a configuration algorithm is developed to flexibly employ the two configuration strategies in tune with the error of critical QoS in configuration process. The results of simulation experiments suggest that our approach outperforms existing configuration approaches in both QoS improvement and resource utilization. 相似文献
6.
This study investigated the removal and transformation of organic matter through laboratory-scale soil-aquifer treatment (SAT) soil columns over a 110-day period. Reductions in total organic carbon (TOC), dissolved organic carbon (DOC), biodegradable dissolved organic carbon (BDOC), nonbiodegradable dissolved organic carbon (NBDOC) and absorbance of ul-traviolet light at 254 nm (UV-254) averaged 71.46%, 68.05%, 99.31%, 33.27% and 38.96% across the soil columns, respectively. DOC/TOC ratios increased slightly with depth while BDOC/DOC ratios showed a converse trend. DOC exiting the soil-column system contained only a very small biodegradable fraction. SAT decreased the concentration of DOC present in feed water but increased its aromaticity, as indicated by specific ultraviolet light absorbance (SUVA), which increased by 50%～115% across the soil columns, indicating preferential removal of non-aromatic DOC during SAT. Overall, laboratory-scale SAT reduced triha-lomethane formation potential (THMFP), although specific THMFP increased. THMFP reduction was dominated by removal in chloroform. All samples exhibited a common general relationship with respect to weight: chloroform>dichlorobromomethane >dibromochloromethane>bromoform. 相似文献
7.
For increased and various communication requirements of modem applications on embedded systems, general purpose protocol stacks and protocol models are not efficient because they are fixed to execute in the static mode. We present the Component-Based Communication Protocol Architecture (CCPA) to make communication dynamic and configurable. It can develop, test and store the customized components for flexible reuse. The protocols are implemented by component assembly and support by configurable environments. This leads to smaller memory, more flexibility, more reconfiguration ability, better concurrency, and multiple data channel support. 相似文献
8.
阮朝辉 《贵州教育学院学报》2007,23(5):68-71
短信写作改变了人们的生活,它在对我们的传统文化进行解构(deconstruction)的同时,又在对当前文化进行一种新的重构,在重构(reconfigurations)人们的思维、重构这一时代的文化范畴。 相似文献
9.
10.
刘玮玮 《宁德师专学报(自然科学版)》2011,23(4):348-352
阐述一种改进算法以解决由不同服务动态组成的SOA进程运行时,一些服务出错引发进程违背端到端服务质量约束的问题.通过查找具有可替换服务的重构域,替换出错服务及其相关服务.替换可由一对一,一对多或多对一的函数映射来实现,由于只替换重构域中的服务而不是整个服务进程,降低了重构经费和服务进程崩溃的风险.最后在Llama的ESB企业服务总线中进行实验模拟,结果表明该算法能有效地修复SOA进程. 相似文献
11.
本文研究用美国Rosemount DC—85A有机总碳测定仪测定石油炼制废水中TOC与COD是否有相关性,二者具有良好的相关性.在一定条件下可以从测得的TOC值推算出COD值,因而可以用TOC值作为有机废水污染的控制指标. 相似文献
12.
贾天理 《绵阳师范学院学报》2009,28(5):11-14
从下乡家电中标企业供应链系统的全局出发,结合数学与TOC方法,分析了多订单条件下家电产品供应的排序问题,提出了基于TOC的供应链系统中的订单排序法,给出了运筹式TOC供应链系统中的订单排序模型,提供了基于TOC供应链系统的运筹管理示例.该方法可以有效地降低供应链系统中的库存,提高家电下乡服务的水平,增加企业有效产出. 相似文献
13.
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15.
李小如 《广东轻工职业技术学院学报》2006,5(2):14-15,27
对广州市区主要河涌TOC值与CODcr值进行了相关性研究,结果表明河涌水中TOC值与CODcr值之间有着良好的相关性。同时根据监测结果对河涌有机污染的状况进行了进一步的分析。 相似文献
16.
基于可重构思想的工业工程实验系统设计 总被引：1，自引：1，他引：1
简要介绍了可重构思想,研究了可重构实验系统中各实验模块及其参数集的关系,并总结了3种可重构实验的重构模式。作者以工业工程实验系统为讨论对象,对工业工程学科中各课程实验模块及其逻辑关系进行了简单的分析,并以物流与供应链实验系统设计实例,重点讨论了可重构方法在工业工程实验体系中的应用。 相似文献
17.
The relationship between student-generated learning issues and self-study in problem-based learning 总被引：1，自引：0，他引：1
A major assumption of problem-based learning (PBL) is that learning issues, generated by students while discussing a problem, are used as guides for self-directed learning activities. This assumption, though basic to PBL, has never been tested. At the University of Limburg, the Netherlands, two procedures have been developed that reflect the extent to which students are able to identify important learning issues given a particular problem, and whether subsequent, independent, learning corresponds with these learning issues. The focus of the present article will be on the relationship between the two. We have explored to what extent student-generated learning issues are a major factor influencing the nature of students' self-study, or whether other factors may be involved in decisions on what to study and how much time to spend on topics selected. First, the production of learning issues was studied and represented as the percentage of overlap between learning issues raised by students and pre-set faculty objectives for each problem. The second procedure consisted of the administration of a Topic Checklist (TOC) which purports to measure students' actual self-directed learning activities. The TOC consists of a list of topics specifying the intended course content. Students were asked to indicate on a five-point Likert scale how much time they had spent studying each topic and to what degree they had mastered that topic. Third, learning issues and TOC topics were compared directly in a qualitative sense. Comparisons between the procedures revealed that a low proportion of variance of TOC scores could be predicted from the percentage of faculty objectives identified for each problem and the direct match between learning issues and TOC scores. It is concluded that scrutinizing student-generated learning issues and topics covered during self-study may provide information about what content is covered by students in tutorial groups. The discrepancy between the results of the measurements suggests, however, that learning issues produced during group discussion are not the sole source on which students base self-study decisions. Several other factors may be involved, such as tutor guidance, content already covered in previous units, issues raised during sessions with resource persons, and the nature of the learning resources available. Therefore, the relationship between learning issues and content covered during self-study is not as straightforward as is suggested. 相似文献
18.
The effects of the concentration of dissolved total organic carbon (TOC), the TOC/Br- ratio, bromide ion levels, the chlorine to ammonia-N ratio (Cl:N), the monochloramine dose and the chlorine dose on the formation of trihalomethanes (THMs) (including chloroform, bromodichloromethane, chlorodibromomethane, and bromoform) from chlorination were investigated using aqueous humic acid (HA) solutions. The profile of the chloramine decay was also studied under various bromide ion concentrations. Monochloramine decayed in the presence of organic material and bromide ions. The percentage of chloroform and brominated THMs varied according to the TOC/Br- ratio. Total THMs (TTHMs) formation increased from 112 to 190 μg/L with the increase concentrations of bromide ions from 0.67 to 6.72 mg/L, but the chlorine-substituted THMs were replaced by bromine-substituted THMs. A strong linear correlation was obtained between the monochloramine dose and the formation of THMs for Cl:N ratios of 3:1 and 5:1. These ratios had a distinct effect on the formation of chloroform but had little impact on the formation of bromodichloromethane or chlorodibromomethane. The presence of bromide ions increased the rate of monochloramine decay. 相似文献
19.
Wing‐Wah Law 《Cambridge Journal of Education》2006,36(4):597-628
Citizenship and citizenship education change during periods of social transition, such as globalization. As globalists have argued, while globalization undermines the state, local institutions, values, cultures, and identities, it also facilitates liberal democracy and a common consumer culture. Citizenship education is urged to respond to globalization and its impact on both global and local communities. In reality, virtually no nation state adopts merely global citizenship; rather, they adopt frameworks of multileveled/multidimensional citizenship. With particular reference to citizenship education in the People's Republic of China (PRC), this paper challenges globalists' views for over‐exaggerating the domination of global forces over domestic ones. In particular, the paper examines the complicated struggles associated with the reconfiguration of the PRC's socialist citizenship and citizenship education that have occurred in response to social changes, including globalization. The paper explains the role of the PRC's state in such reconfiguration and offers a new framework that regards citizenship education as being based on different players' sociopolitical selections from a multileveled polity. 相似文献
20.
伽达默尔哲学的七个关键术语 总被引：6，自引：0，他引：6
R·E·帕尔默 《安徽师范大学学报(人文社会科学版)》2002,30(5):502-508
"存在之显现" 是伽达默尔的真理观念."时间性"指的是通过语言性、书写性、和诗歌的奇迹,产生了文本战胜历史"时间"而具有"同时性" 的奇迹."实践智慧" 是伦理方式选择善的理智."应用"的意思是当我们理解过去的某件事物时,我们同样领会它在今天是如何应用的 "传统"是指我们在语言中继承下来的态度和方法,在我们试图弄懂任何事物时都会在我们的意识中发生作用,而"效果历史意识" 是一种历史总结在发挥作用的意识.语言最典型地生存于交谈、问答、对话的平等交换之中.使人类团结在一起的的节日庆典是真正交流的基础. 相似文献