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The implemented new legal regulations regarding thermal comfort, the energy performance of residential buildings, and proecological requirements require the design of new building materials, the use of which will improve the thermal efficiency of newly built and renovated buildings. Therefore, many companies producing building materials strive to improve the properties of their products by reducing the weight of the materials, increasing their mechanical properties, and improving their insulating properties. Currently, there are solutions in phase-change materials (PCM) production technology, such as microencapsulation, but its application on a large scale is extremely costly. This paper presents a solution to the abovementioned problem through the creation and testing of a composite, i.e., a new mixture of gypsum, paraffin, and polymer, which can be used in the production of plasterboard. The presented solution uses a material (PCM) which improves the thermal properties of the composite by taking advantage of the phase-change phenomenon. The study analyzes the influence of polymer content in the total mass of a composite in relation to its thermal conductivity, volumetric heat capacity, and diffusivity. Based on the results contained in this article, the best solution appears to be a mixture with 0.1% polymer content. It is definitely visible in the tests which use drying, hardening time, and paraffin absorption. It differs slightly from the best result in the thermal conductivity test, while it is comparable in terms of volumetric heat capacity and differs slightly from the best result in the thermal diffusivity test. 相似文献
3.
Deepthi Kalahasti Veena Hegde Kranti Kosaraju Srikala Baliga N. Kulasekhar Reddy BK Sujatha 《Journal of Indian Prosthodontic Society》2014,14(4):381-392
The aim of this study is to assess the efficacy of microwave irradiation in disinfecting gypsum casts and also to compare its efficacy with validated method of chemical disinfection. The present study is an ex vivo study conducted on a sample of five irreversible hydrocolloid impressions in vitro and on ten patients gypsum casts in vivo following standard impression techniques to check the efficacy of microwave oven irradiation and compare its efficacy with standard chemical method of disinfection. Results were analysed using Mann–Whitney test and Wilcoxon signed rank test. Untreated gypsum casts showed cfu/ml counts with a median log value of 6, while microwave-irradiated ones had median cfu/ml counts of 0. Casts poured from chemically disinfected impressions demonstrated cfu/ml counts with a median log value of 5. Microwave irradiation was found to be effective in disinfecting gypsum casts when compared to chemical disinfectant in disinfecting dental impressions. 相似文献
4.
目的:测定用2%戊二醛喷雾消毒方法处理阴模后,牙科石膏模型材料的精度及硬度,为临床模型消毒提供参考。方法:在60mm×30mm×30mm体积的不锈钢模块上用藻酸盐印模材料制取阴模60个,分成2组,每组30个。试验组用2%戊二醛均匀喷洒置于密封塑料袋中30min;对照组清水喷雾置于密封塑料袋中30min。用普通石膏灌注,24h后分别测量其表面精度及硬度,用SPSS11.0软件对试验结果进行统计学分析。结果:2组资料精度和硬度差别无显著统计学意义。结论:2%戊二醛喷雾密封消毒操作简便同时减少了戊二醛的用量,可用于印模材料的消毒。 相似文献
5.
大青散治疗臁疮89例疗效观察 总被引:5,自引:0,他引:5
赵东瑞 《浙江中医药大学学报》2007,31(5):575-576
[目的]探讨大青散治疗臁疮的近期疗效。[方法]对89例臁疮患者外敷大青散包扎,对照组18例外敷凡士林纱条包扎,疗程3周。[结果]3周后治疗组痊愈及显效例数明显高于对照组,经统计学处理比较差异有非常显著意义。[结论]大青散是一种治疗臁疮的良效外用药。 相似文献
6.
Nur Jannah Abdul Hamid Aeslina Abdul Kadir Nurul Nabila Huda Hashar Pawe Pietrusiewicz Marcin Nabiaek Izabela Wnuk Marcek Gucwa Pawe Palutkiewicz Azini Amiza Hashim Noor Amira Sarani Amos Anak Nio Norazian Mohamed Noor Bartomiej Jez 《Materials》2021,14(11)
Wastewater treatment activities in the chemical industry have generated abundant gypsum waste, classified as scheduled waste (SW205) under the Environmental Quality Regulations 2005. The waste needs to be disposed into a secure landfill due to the high heavy metals content which is becoming a threat to the environment. Hence, an alternative disposal method was evaluated by recycling the waste into fired clay brick. The brick samples were incorporated with different percentages of gypsum waste (0% as control, 10, 20, 30, 40 and 50%) and were fired at 1050 °C using 1 °C per minute heating rate. Shrinkage, dry density, initial rate of suction (IRS) and compressive strength tests were conducted to determine the physical and mechanical properties of the brick, while the synthetic precipitation leaching procedure (SPLP) was performed to scrutinize the leachability of heavy metals from the crushed brick samples. The results showed that the properties would decrease through the incorporation of gypsum waste and indicated the best result at 10% of waste utilization with 47.5% of shrinkage, 1.37% of dry density, 22.87% of IRS and 28.3% of compressive strength. In addition, the leachability test highlighted that the concentrations of Fe and Al was significantly reduced up to 100% from 4884 to 3.13 ppm (Fe) and from 16,134 to 0.81 ppm (Al), respectively. The heavy metals content in the bricks were oxidized during the firing process, which signified the successful remediation of heavy metals in the samples. Based on the permissible incorporation of gypsum waste into fired clay brick, this study promised a more green disposing method for gypsum waste, and insight as a potential towards achieving a sustainable end product. 相似文献
7.
慢性阻塞性肺疾病(COPD)重度通气功能障碍临床治疗效果较差,目前西医推荐用沙美特罗替卡松干粉吸入剂吸入,也仅能减少COPD急性发作,延缓肺功能下降速率[1]。笔者曾运用大剂量石膏辨证治疗COPD重度通气功能障碍1例,取得了良好的临床疗 相似文献
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9.
黄耀生 《浙江中医药大学学报》2010,34(5)
[目的]探讨生石膏对小儿发高烧的治疗效果。[方法]36例临床患者,均予以大剂量生石膏治疗,或适当加辅佐药配合治疗。[结果]36例患者用药后都达到了退烧的满意效果。其中24h内退烧者4例,占11.1%;24~48h退烧者25例,占69.4%;48h后退烧者7例,占19.5%。[结论]生石膏治疗小儿发高烧有较好疗效。 相似文献
10.
Donald E. Canfield James Farquhar 《Proceedings of the National Academy of Sciences of the United States of America》2009,106(20):8123-8127
As recognized already by Charles Darwin, animals are geobiological agents. Darwin observed that worms aerate and mix soils on a massive scale, aiding in the decomposition of soil organic matter. A similar statement can be made about marine benthic animals. This mixing, also known as bioturbation, not only aides in the decomposition of sedimentary organic material, but as contended here, it has also significantly influenced the chemistry of seawater. In particular, it is proposed that sediment mixing by bioturbating organisms resulted in a severalfold increase in seawater sulfate concentration. For this reason, the evolution of bioturbation is linked to the significant deposition of sulfate evaporate minerals, which is largely a phenomena of the Phanerozoic, the last 542 million years and the time over which animals rose to prominence. 相似文献