Modifying agent selection for Al-7Si alloy by Miedema model

To determine the modifying agents for Al-7Si alloys, microstructure observation and mixing enthalpy analysis using Miedema model for Al-7Si alloy with additions of different rare earth elements were performed, and the effects of rare earth elements on the modifica-tion of eutectic silicon morphology were investigated. The results of mixing enthalpy analysis show that these four rare earth elements, La, Sm, Pr, and Ce, which have the large negative mixing enthalpies with Si, can be selected as modifying agents for eutectic silicon morphology. The element with the largest negative mixing enthalpy is Ce. Furthermore, the microstructures indicate that these four elements can effec-tively modify the eutectic （α）Al-Si crystals in Al-7Si alloy, and the most effective one is also Ce. Differential scanning calorimetry （DSC） results show that the eutectic temperature depressions due to the additions of modifying agents are the important reasons for the modification of eutectic （α）Al-Si crystals.

Study on Preparation of Waterproofing Agent for Mineral Wool Board from Modified C_9 Petroleum Resin

The modified petroleum resin emulsion prepared from the C9petroleum resin was modified with maleic anhydride.The effects of maleic rosin and maleic anhydride addition level,the modification time and the alkali liquor on the properties of the emulsion were discussed.The results showed that the optimum process conditions covered:a maleic anhydride mass fraction of 1.5%,a maleic rosin mass fraction of 10%,a KOH mass fraction of 1%,a petroleum resin modification temperature of 200℃,a petroleum resin modification duration of 3 h,and a modified petroleum resin emulsion/wax emulsion mixing ratio of 1:1.The particle size of modified petroleum resin emulsion prepared under these conditions was equal to 104.166μm.

Experiments of Applying the Rare-Earth Modifying Agents in New Dental Materials Preparation

Harmless rare-earth modifying agents were prepared by orthogonal experiments. A new resin material was synthesized with the qualities such as rigidity, rubbing abrasion, aging, luster and plasticity better than the dental resin materials in common used. It could be used as the substitutes for the applied resin teeth materials.

改性赤泥固化剂对赣南稀土堆浸场地土壤固化作用的影响试验

为了解决稀土堆浸场地边坡稳定性较差的问题,以水泥、赤泥、氧化钙作为原材料,研制氧化钙激发赤泥并联合水泥制成固化剂,设计12组不同质量配比的土壤固化剂试验方案,利用四联直剪仪进行室内直剪快剪试验,研究原材料比例关系对土样黏聚力与内摩擦角的影响,并在得到的最佳固化剂配比条件下,探究不同养护龄期对土样抗剪强度的影响。研究结果表明:当水泥质量分数为4%,氧化钙与赤泥质量比例为1∶3时,土样的内摩擦角及黏聚力达到最大值;当养护龄期为11d时,内摩擦角达到最大值;当养护龄期为13d时,黏聚力达到峰值,可减少离子型稀土堆浸场地的水土流失,提高场地边坡的抗剪强度。

交联型聚乙烯醇纸张表面施胶剂的制备及其应用

为了改善聚乙烯醇、淀粉作为纸张表面施胶剂的应用性能,选用γ-缩水甘油醚氧丙基三甲氧基硅烷(KH560)和硼砂(STB)为交联剂,交联改性淀粉(PS)和聚乙烯醇(PVA1799),制备出不同交联程度的纸张表面施胶剂(CPSn-PVA).通过傅里叶红外光谱(FT-IR),扫描电镜(SEM)及稳定性测试对纸张表面施胶剂的性能进行了表征,探讨了KH560和STB的添加比例对纸张施胶剂的性能以及施胶后纸张物理性能的影响.实验结果表明,当STB添加量为0.1 g、KH560添加量为3 g时,纸张施胶剂膜拉伸强度可达25.6 MPa、断裂伸长率为326%.同时,与原纸相比,多重交联型纸张表面施胶剂表现出良好的应用性能,施胶后的纸张耐折次数、撕裂指数、接触角分别提升了6700%、65.04%、89.7%.

基于Agent的提议修正的情感劝说交互模型

基于Agent的情感劝说是商务智能中基于Agent的自动谈判发展到目前为止相对智能和高级的形式,交互模型是保障自动谈判顺利完成的关键,针对现有研究中对该模型量化研究不足,导致Agent情感等人工智能优势利用不够的现状,对基于Agent的情感劝说交互过程进行分析,绘制了交互流程图,并设计了交互规则;以买方Agent为主体,引入情感劝说修正因子和目标修正因子,构建了提议修正函数和交互函数,并采用多属性效用理论和期望效用理论给出情感劝说修正因子算法,综合运用目标冲突理论和后悔理论给出目标修正因子算法,进而给出交互函数算法;综合所提交互规则和交互函数给出基于Agent提议修正的情感劝说交互模型,并以煤炭行业供应链管理中的采购商与供应商为例进行算例分析和敏感性分析,验证了模型的合理性和有效性,而且通过归纳结论得出了相应的管理启示。

硅藻土改性沥青性能试验研究

文章分析不同沥青标号、硅藻土掺量和材料特性对改性沥青性能的影响,探究硅烷偶联剂对硅藻土改性沥青的改善效果。研究发现:适量的硅藻土能够提高沥青的性能并抑制老化,尽管延度受到影响,但仍符合相关规范要求。高比表面积和高SiO_(2)含量的硅藻土改性剂提升沥青性能效果显著。老化试验显示,硅藻土能够显著抑制沥青老化,单掺效果最佳。总体而言,硅藻土在提升沥青品质、延长路面寿命方面较为适用。

基于改进的Multi-Agent诊断的时间调度算法的研究

为了合理安排多任务合作中的时间,提出了基于改进的遗传算法的Multi-Agent的多任务协作调度算法。在Multi-Agent的多任务协作时间调度算法中引入遗传算法,能提高运算的准确性。在介绍Multi-Agent系统结构的基础上,分析了Multi-Agent的协作问题以及基于改进的遗传算法的调度算法。多任务协作调度算法的应用有效地最小化了系统的额外代价,实现了Multi-Agent系统的优化。

改性有机硅混凝土表面增强剂的研制

以改性有机硅树脂乳液为主要成膜物质,添加硅酸锂、滑石粉和氟硅酸镁等无机材料,再辅以渗透剂等助剂,制备改性有机硅混凝土表面增强剂,研究了基础乳液、硅酸锂、滑石粉、氟硅酸镁和渗透剂用量对表面增强剂性能的影响。结果发现,以20%固含量改性有机硅树脂乳液为基料,然后加入3%滑石粉、4%硅酸锂、5%氟硅酸镁以及1%渗透剂制备的改性有机硅混凝土表面增强剂喷涂在C30混凝土后,渗透深度能达到12 mm,黏度、pH值、成膜时间符合JC/T 949—2021《混凝土制品用脱模剂》的要求,冻融稳定性符合GB/T 43273—2023《农药冻融稳定性测定方法》的要求。表面回弹强度提升率为19.4%,表面回弹强度提升效果较好。

温拌橡胶改性沥青混合料路用性能

为了研究不同掺量的温拌剂对橡胶改性沥青混合料路用性能的影响,选取中石化LKW-II型作为温拌剂,制备了不同掺量的橡胶改性沥青混合料,并进行了高温、低温、水稳、疲劳等路用性能试验,最后结合山西省国省道路面改造工程,对比分析了LKW-II型温拌橡胶改性沥青混合料与传统热拌橡胶改性沥青混合料在实际工程中的性能,研究结果表明:LKW-II型温拌橡胶改性沥青混合料的最优拌和温度为160℃、压实温度为140℃,降温效果约20℃。LKW-II型温拌剂能够显著提升混合料的高温稳定性、低温抗裂性、水稳定性及抗疲劳能力,掺量0.3%(质量比)时效果最显著,其中动稳定度指标提升17.54%、低温抗弯拉强度提升17.08%、低温应变提升10.69%、冻融劈裂强度比提升13.93%、浸水稳定度残留度提升27.51%、疲劳寿命次数提升18.18%。掺量0.1%时的指标数值与0.3%相差很小,掺量0.5%的指标数值有大幅度下降。推荐LKW-II型温拌剂的掺量为橡胶改性沥青质量的0.1%~0.3%。

Modified calcination conditions of rare alkali metal Rb-containing muscovite(KAl_2[AlSi_3O_(10)](OH)_2)

Muscovite mineral was roasted in different conditions.Rubidium leaching rate was a standard to examine the impact of various factors on calcination effect,including the agent types,roasting time,mass ratio,and roasting temperature.The results indicate that the best agent is the combination of sodium chloride and calcium chloride,and its mass ratio of muscovite/NaCl/CaCl2is1.00:0.25:0.25.Calcined at 850℃ for 30 min,the rubidium leaching rate is up to 90.12%.The reaction of muscovite ore with the chlorinating agent CaCl2was studied by TG/DSC,and the surface morphology before and after leaching was characterized by SEM.Rubidium chloride products can be obtained using t-BAMBP extraction,hydrochloric acid re-extraction,and purification.

Sorption of Heavy Metal and Organic Pollutants on Modified Soils

Sorption characteristics of both an organic pollutant (phenol) and a heavy metal (cadmium ion) on the clay layer of a Lou soil (Eum-orthic Anthrosol in Chinese Soil Taxonomy) along with the sorption mechanism were investigated using three soil treatments: modification with a cationic surfactant cetyltrimethylammonium bromide added at an amount equivalent to 50% and 100% of the soil CEC (50%CB and 100%CB), modification with an amphoteric surface-modifying agent dodecyldimethylbetaine (commercially known as BS-12) added at an amount equivalent to 50% and 100% of the soil CEC (50% BS and 100%BS), and an unmodified control (CK). Results showed that the BS soil treatments increased sorption of both the heavy metal Cd2+ and the organic pollutant phenol. The equilibrium sorption amount of Cd2+ decreased in the order: 50%BS > 100%BS > CK > 50%CB > 100%CB, with the BS soil treatments being about 1.3 to 1.8 times higher and the CB soil treatments about 23% to 41% lower than CK. Both the single-site and two-site Langmuir models could be applied to describe the sorption of Cd2+ in each soil treatment. The equilibrium sorption amount of phenol on the soil samples decreased in the order: 100%CB > 50%CB > 100%BS > 50%BS > CK, with the CB soil treatments being 41.0 to 79.6 times higher and the BS soil treatments 4.0 to 8.3 times higher than CK. The Freundlich equation could also be used to describe the sorption characteristics of phenol. In the BS soil treatments, both an organophobic long carbon chain and hydrophilic charged groups resulted in a relatively strong sorption ability for both heavy metals and organic pollutants. In addition, the sorption ratio K, the ratio of phenol sorption amount of the modified soil to that of CK, increased initially and decreased later with the amount of phenol added, and the critical sorption ratio KC, the peak value of the sorption ratio curve plotted against the added phenol concentration, was a good index for evaluating the sorption ability of phenol in the soil.

Compound Rejuvenation of Polymer Modified Asphalt Binder

The objective of this research was to show a way to conduct rejuvenation of aged polymer modified asphalt binder（PMB） successfully.To fully evaluate and understand the rejuvenation of aged PMB,the Penetration grade tests including penetration,soften point,ductility and elastic recovery and SuperpaveTM PG grade tests including DSR,BBR and DDT were conducted.The rejuvenation effect of aged PMB by utilizing a fluid recycling agent in common use for binder rejuvenation was evaluated.And then the compound rejuvenation effect of aged PMB by utilizing the recycling agent with a new modifying additive for binder modification was evaluated.The experimental results indicated that the recycling agent in common use currently does not apply to polymer modified asphalt binder rejuvenation.But the recycling agent together with the modifying additive can restore the characteristics of aged polymer modified binder very well.Therefore,compound rejuvenation of polymer modified asphalt binder is recommended.

Outcomes assessment of hepatitis C virus-positive psoriatic patients treated using pegylated interferon in combination with ribavirin compared to new Direct-Acting Antiviral agents

AIM To evaluate the outcomes in biological treatment and quality of life of psoriatic patients with chronic hepatitis C(CHC) treated with new Direct-Acting Antiviral agents(DAAs) compared to pegylated interferon-2α plus ribavirin(P/R) therapy.METHODS This is a retrospective study involving psoriatic patients in biological therapy who underwent anti-hepatitis C virus(HCV) treatment at the Department of Dermatology Galeazzi Orthopaedic Institute Milan, Italy from January 2010 to November 2017. The patients were divided into two groups: patients that underwent therapy with DAAs and patients that underwent HCV treatment with P/R. Patients were assessed by a dermatologist for psoriasis symptoms, collecting Psoriasis Area Severity Index(PASI) scores and the Dermatology Quality of Life Index(DLQI). PASI and DLQI scores were evaluated 24 wk after the end of HCV treatment and were assumed as an outcome of the progression of psoriasis. Switching to a different b DMARD was considered as an inadequate response to biological therapy. The dropout of HCV therapy and sustained virological response(SVR) were considered as outcomes of HCV therapy.RESULTS Fifty-nine psoriatic patients in biological therapy underwent antiviral therapy for CHC. Of this, 27 patients were treated with DAAs and 32 with P/R. After 24 wk post treatment, the DLQI and the PASI scores were significantly lower(P < 0.001 and P < 0.005, respectively) in the DAAs group compared with P/R group. None of the patients in the DAAs group(0/27) compared to 8 patients of the P/R group(8/32) needed a shift in biological treatment.CONCLUSION DAAs seem to be more effective and safe than P/R in HCV-positive psoriatic patients on biological treatment. Fewer dermatological adverse events may be due to interferon-free therapy.

BDI agent导引修改机制用于Peer to Peer系统文件操作

类是面向对象技术中最重要的概念,改进类的结构后给出了一种可计算的agent模型.这种模型的特点是加入了导引函数与一些修改函数,导引函数借助节点信息树实现agent的BDI搜索,这是agent的通常工作模式.修改函数用来完成agent的生长与变异,各地的agent与访问的agent作用在一起形成分布式多agent系统(distributedmulti-agentssystem).这一模型能够用于PeertoPeer系统交互以及实现多粒度文件操作.

STUDIES ON IPE OF POLYACRYLAMIDE INVERSE EMULSION AND MODIFIDE UREA-FORMALDEHYDE RESIN

The selective water plugging agent was prepared by heating the blends of the polyacry-lamide inverse latex, modified urea formaldehyde resin, crosslinking agent and catalysts.The results show that using different types of polymers and additives or changing in theirproportion of the blends, the gelling viscosity, starting point of gelling and other propertiesof the IPN can be controlled.

Adsorption of Naphthalene on Modified Zeolite from Aqueous Solution

In this study, the modified zeolite with certain hydrophobicity was prepared by modifying natural zeolite by the silane coupling agents such as vinyltrimethoxysilane (VTMO), trimethoxysilane (TMS) and trimethylchlorosilane (TMCS). The modified zeolite has a higher hydrophobicity and adsorption capacity than natural zeolite while ensuring the advantages of natural zeolite, which is more conducive to the adsorption of organic pollutants from aqueous solution. The adsorption experiment on naphthalene in aqueous solution shows that the modified zeolite has a stronger adsorption capacity. In the adsorption thermodynamics experiment, the isothermal adsorption models such as Freundlich and Langmuir can better describe the adsorption of naphthalene on modified zeolite, but the isothermal adsorption model Freundlich has a higher correlation. At 303K, the static adsorption capacity is 339μg/g. The kinetic analysis shows that the adsorption of naphthalene on modified zeolite conforms to the quasi-second order kinetic model.

基于Agent建模的小群体疏散时间研究

在传统社会力模型中引入小群体领导力参数,修正疏散过程小群体成员的运动方向与运动速度。基于改进的社会力模型进行Agent建模,利用Anylogic得到计算结果,统计分析不同小群体规模、小群体占总人数比例及小群体会合地点情况下小群体成员的疏散时间,研究小群体行为参数对疏散时间的影响。结果表明:小群体规模越大、占总人数比例越高、会合地点越接近房间中部,疏散时间越长。

纤维素基共聚型聚羧酸减水剂的合成及其性能

以天然纤维为原料,采用接枝醚化-烯丙基氯双键改性-水溶液自由聚合路线制备纤维素基共聚型聚羧酸减水剂(HEPCEs),通过傅里叶变换红外光谱、凝胶渗透色谱对产品HEPCEs进行分子结构分析,通过净浆流动度、经时变化流动度测试对HEPCEs减水性能进行评价,并同时进行了分子粒径、zeta电位以及吸附层厚度的测试,探究HEPCEs对水泥净浆的作用机理。结果表明,纤维素基共聚型聚羧酸减水剂中改性纤维素聚醚(DBHECs)适宜替代量为5%~10%,过多替代会出现支链缠绕并阻碍羧酸基团锚固,适量替代的纤维素结构引入可以在保持较好吸附性能的同时进一步提升减水剂的性能,超过商用高效减水剂标准,并表现出一定的缓释作用。

骨改良药物在肺癌骨转移中的研究进展

目前各指南推荐恶性肿瘤骨转移的内科治疗药物主要为骨改良药物,分为地舒单抗和双膦酸盐类,同时这两类药物也获批适应证为治疗高钙血症、骨质疏松。双膦酸盐类药物临床使用时间长,应用广泛,种类较多,目前分为三代,每代都有不同的代表药物,如一代的依替膦酸二钠、膦酸二钠等,二代的帕米膦酸二钠,三代的唑来膦酸等。肺癌是全球发病率较高的肿瘤,患者就诊时大多已为晚期,其中出现骨转移的患者约占一半,给患者的生活质量带来了巨大的负担,因此一旦明确诊断肺癌骨转移,应尽早使用骨改良药物治疗。本文就骨改良药物在肺癌骨转移中的应用做一综述。