一种基于目标因子分析的模型传递方法

在目标转换因子分析的基础上建立了一种新的模型传递方法,并将该方法与传统的分段直接标准化(PDS)方法进行比较。采用了两个样品集：虚拟样品集和配制样品(含苯,甲苯,二甲苯和异辛烷)的近红外光谱集。结果表明：新方法的传递效果至少与PDS方法的传递效果相同,对于谱图出现非线性变化的情况,新方法的传递效果更好。     

后课改时期 PDS理念对数学教师专业发展的启示

新一轮基础教育课程改革正在实施,起主导作用的数学教师队伍是实施数学课程改革的关键环节,基础教育阶段数学教师应具备精深的专业基础知识、良好的教育教学能力、指导训练能力、教科研能力等专业素质。 PDS作为一种教师培养的形式,构建了更加完善的教育体系,促进了在职教师专业发展。借鉴PDS理念,在高等师范专科学校与中小学之间进行合作,建立“高校———中小学”合作共同体,快速提升在校准教师和在职教师的专业化程度。     

辣椒病毒诱导基因沉默体系的构建

采用RT-PCR方法克隆辣椒八氢番茄红素脱氢酶(PDS)基因部分序列,并构建病毒诱导基因沉默(VIGS)载体pYL156-PDS,经农杆菌介导侵染辣椒叶片,采用表型观察、半定量RT-PCR方法评价构建的VIGS体系的沉默效果.结果表明,辣椒新生叶片呈现明显的光漂白现象,且叶片内源PDS基因表达量明显低于对照.研究证明,辣椒VIGS体系已被成功构建,为规模化验证辣椒基因功能提供了技术平台.     

Efficient degradation of sulfamethoxazole by acetylene black activated peroxydisulfate

Acetylene black (AB), as a kind of carbon material with large specific surface area, low density, strong electron transferability, is supposed to have great potential for application in advanced oxidation processes (AOPs). In this study, AB was utilized as a peroxydisulfate (PDS) activator for the catalytic degradation of sulfamethoxazole (SMX) in aqueous media. Scanning electron microscopy (SEM), X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) techniques, zeta potential and Raman spectra were employed to characterize the features of AB. To verify the excellent performance of AB/PDS systems, a series of control experiments were carried out. Compared to graphite/PDS and biochar/PDS system, AB/PDS system could complete degradation of SMX within 15 min. Besides, the effects of key factors including AB dosage, PDS dosage, initial pH and SMX concentration on SMX degradation in AB/PDS system were elucidated systematically. Furthermore, through the radical quenching experiments, it was proved that singlet oxygen (¹O₂) was dominantly responsible for the degradation of SMX. Finally, based on the experiment results and comprehensive analysis, a probable reaction mechanism of AB/PDS system for SMX degradation was proposed. This work suggests that AB has a good potential for tackling the hazardous pollutants in environmental remediation.     

Studies on photoprotection and photo-oxidation in polystyrene with various wavelength regions

The photoprotection of styrene-2,2,6,6-tetramethyl-4-piperidinyl methacrylate copolymer (PDS) as an ultraviolet absorbent and the photo-oxidation in polystyrene (PS) film with various wavelength region irradiations have been studied. It was found that the photoprotection of PDS as the hindered amine for PS film was effective. In the full wavelength region irradiation, the Yellowness Index (YI) as the characterizing parameter was only 20%, corresponding to an exposure period as long as 80 hr. The results have proved that the photoprotection behavior of PDS was more effective a wavelength of 274 nm than of 318.5 nm, and the increment of the YI was proportional to the intensity absorbed by PS film. The infrared and ultraviolet spectra of PS film undergoing photooxidation have shown that (a) the dominant contribution to the increment of the ultraviolet characteristic absorption peak A (274 nm) of PS film belonged to the wavelength region (200–320 nm) rather than the singlet, and that (b) the infrared shifting of the wide-peak A (274 nm) could be considered as the relative changes of the constants of carbonyl compounds with the conjugating and non-conjugating structures from the end-products of the photo-oxidation process.     

计算机网络综合布线工程的要点

讨论了计算机网络综合布线工程中若干重要事项。     

大中型企业综合布线解决方案

介绍了大中型企业综合布线的设计原则、结构组成和实施途径。为企业建立自己的集成信息系统、实现智能化办公提供了可行性方案．     

设计-建造和设计-招标-建造项目执行期成本控制绩效元分析

全面分析了对比设计-建造(DB)和设计-招标-建造(DBB)项目执行期成本控制绩效的已有成果,发现各研究的样本项目条件不同,且大多为小样本,导致对两种模式下项目执行期成本控制绩效的差异缺乏一致结论.为此,采用随机效应元分析模型整合已有成果,基于大样本得出平均意义上的结论.结果表明,整体上DB模式能显著地改善执行期的成本控制绩效,稳健性检验说明该结果客观反映了两种模式的差异.分组元分析表明,DB模式在公共项目中带来的绩效改善较小;业主类似经验较少的项目中DB模式能更好地控制成本;DBB模式更适用于较复杂的项目;DB模式的绩效改善作用表现出先增后减的阶段性变化规律,与相应年代的政策导向有关.业主应在对比不同模式下项目绩效时充分考虑项目条件的影响,据此选择交易模式.得出的各项目条件对两种模式下成本控制绩效差异的影响在业主的交易模式选择决策中具有借鉴意义.     

正相依风险下离散模型的最优分红

将保险公司各期净损失相互独立的假定改进为依随机序正相依.在相依风险下,利用动态规划原理和状态空间约简,刻画了最优分红策略,证明了区域策略最优,同时讨论了值函数的性质,并给出了数值算法.其中,对涉及独立假定的结论,给出了相依条件下的相应结果,对未涉及独立假定的部分结论也做了改进.研究发现,与独立情形不同,在依随机序正相依风险下,保险公司不必以概率1破产.     

重庆先进智能小区综合布线工程设计案例分析

在对已完成工程实践经验总结的基础上 ,论述了在结构化布线系统规划和设计过程中应注意的几个关键问题 ,并以重庆金科花园先进型智能住宅小区为工程实例分析了结构化布线系统的工程设计过程