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1.
随着科技的不断发展,虚拟现实技术(以下简称VR技术)也在不断的创新,VR技术在当今社会被广泛推崇,多个重要领域都发现了它的重要性,它在未来的发展趋势势必也会只增不减,现已逐渐将此技术应用到医学方面,该文通过高频发生的抑郁心理问题现状,结合SWOT分析方法,通过研究VR技术与抑郁症心理调适交叉结合的创新模式,推动VR技术在异常心理调适与数字化模式上的探索.  相似文献   
2.
相邻工作面开采会导致复杂的漏风情况,浮煤易自燃,增大防火工作的难度。为明确相邻采空区自燃“三带”分布特征及确定最佳注氮防灭火参数,以贵州某矿4244工作面为背景,结合现场实测,应用Fluent流场分析软件,模拟研究不同注氮方案下采空区氧气浓度场分布规律。结果表明,实测结果与模拟相吻合,验证了模拟的可靠性;当注氮位置为X=50 m,注氮流量为100 m3/h时,采空区进、回风巷侧氧化带宽度分别为7 m和38 m,能明显减少本采空区氧化带面积,且能防止氧化带距工作面太近;此工作面进风侧注氮对相邻采空区氧化带影响范围较小,这要求在回采过程中需要对煤柱进行加固,降低孔隙率,控制漏风,减少氧气进入相邻采空区,降低煤自燃风险。模拟结果为相邻采空区灾害防治工作提供了的理论指导。  相似文献   
3.
蒙特卡洛法需使用大量电网抽样数据,花费的风险评估时间长,提出一种改进蒙特卡洛法实现高效智能电网实时运行风险评估。从多方面考虑,构建智能电网风险评价指标体系,明确蒙特卡洛法存在抽样次数多及方差系数大的问题;将交叉熵重要抽样法与分散抽样法相结合,构建近似函数,令原本电网中微小概率事件转换为大概率事件,减少算法抽样次数和方差系数,提高算法的计算效率。实验表明,所提方法能够有效识别正常状态下及元件失效条件下的电网实时运行风险,并通过失效线路负荷转移的方式有效降低了智能电网实时运行风险。  相似文献   
4.
Applied Composite Materials - The paper presents a study on the ballistic performance of 3D woven wadded through-the-thickness angle-interlock fabrics (TTAI) fabric reinforced composites. Their...  相似文献   
5.
为解决矿井大埋深工作面接续及安全生产问题,结合现场地质条件,采用了沿空留巷工艺优化实施方案,提出了关键技术工艺及要求,形成了一套完整的留巷技术方案,缓解了接续,保证了安全生产。  相似文献   
6.
宋敏  张媛媛 《资源与产业》2022,24(1):107-114
从时空角度研究长江经济带的水环境污染状况,探究异质性环境规制对水环境污染的影响,为促进水资源合理利用与绿色发展提供参考。基于2009—2019年长江经济带11个省市的面板数据,研究长江经济带水环境污染的时空特征,用Moran's I指数研究水环境污染的空间自相关性,再通过空间杜宾模型探究异质性环境规制对水环境污染的空间溢出效应。研究表明:1)总体来看,长江经济带水环境污染呈上升趋势,其中上游地区水环境污染增速较快,下游和中游地区有所放缓,水环境污染得到一定控制;2)长江经济带水环境污染严重程度具有明显的空间特征,呈现出下游>中游>上游的趋势;3)从异质性角度来看,命令控制型环境规制能显著抑制水环境污染,在经济矩阵下效果最为显著,市场激励型环境规制具有显著负向作用,而公众自愿型环境规制的作用并不明显;4)从溢出效应来看,命令控制型环境规制对周围省市的水环境污染具有负向的空间溢出效应,市场激励型环境规制也会减轻周围省市的水环境污染严重程度,但没有命令控制型环境规制效果明显,公众自愿型环境规制效果不显著。目前长江经济带水环境污染状况仍不容乐观,需要进一步加强管控。虽然命令控制型环境规制对水环境污染治理效果最好,但公众参与也应该提上日程。各地要因地制宜,选择合适的方式来治理,此外还需要建立空间意识,加强联合治理。  相似文献   
7.
Thermal action in extraction process had effects on characteristic tryptic peptides identification and gelling properties of porcine gelatin. SDS-PAGE, HPLC-LTQ/Orbitrap high-resolution mass spectrometry, texture analyser and rheometer were used to evaluate collagen depolymerisation degree, characteristic tryptic peptides and gelling properties of gelatins prepared in various thermal actions. Results showed that with increasing temperature and time, depolymerisation degree enlarged, while gel strength, gelling and melting temperature decreased. Mass spectra showed that 47 and 49 common characteristic tryptic peptides were identified in gelatins extracted at 50 °C and 100 °C with various times, respectively. Moreover, 34 common characteristic tryptic peptides were identified in all gelatin samples. Further comparison between this work and our previous investigations yielded 20 common characteristic tryptic peptides, which stably exist in various thermal actions. These common characteristic tryptic peptides may be very helpful for the accurate authentication of porcine gelatin.  相似文献   
8.
Huang J.  Ni D.  Ni X.  Chen W.  Fu Y. 《丝绸》2022,(12):187-196
Silk is a kind of natural fiber with good luster strength elasticity dyeability hygroscopicity and other advantages. Silk products are quite popular to the customers because of their excellent performance such as heat preservation air permeability and so on which make them comfortable to use. Silk floss which is made from pupa lining secondary cocoon etc. can be used as floc and filler materials and is an important part of silk products. According to its production mode silk floss can be divided into manual silk floss and machine-made silk floss and the latter has become the main processing mode of silk floss production due to its high production efficiency. In terms of composition silk flossing generally contains 20% - 30% sericin pupa oil and impurities so in the degumming process in addition to adding sodium carbonate and other degumming agents to remove sericin a large amount of hydrogen peroxide with strong oxidation property is also used to increase the cleanliness and smoothness. Unfortunately hydrogen peroxide is highly flammable and explosive and poses a risk in transportation and storage causing potential safety hazards to the silk processing industry. In order to solve this problem we innovatively propose two hydrogen peroxide-free processing methods of machine-made silk floss by using sodium percarbonate degumming or sodium carbonate-ozone. As an environmentally friendly solid oxidant sodium percarbonate can produce hydrogen peroxide and sodium carbonate after decomposition and is often used to degrade organic harmful substances. Similarly ozone is a common strong oxidant with broad-spectrum antibacterial properties and because ozone can be produced instantly by ozone generators there is no risk of transport and storage. Silk is composed of silk fibroin and sericin. Among them silk fibroin is fibrous protein which will swell in hot water while sericin is globular protein which is easy to dissolve in hot water. As a result in this paper heated sodium percarbonate solution and sodium carbonate-ozone system were used to deglue silk floss. The methods were as follows silk floss was degummed three times in boiling 0. 78 g / L sodium percarbonate solution for 30 minutes each time or was degummed three times in boiled 0. 5 g / L Na2 CO3 solution with ozone continuously flow at a rate of 100 mg / L - h for 30 minutes each time. After cleaning and drying the degummed silk floss can be obtained. After the experiment the apparent morphology sericin residual efficiency impurity rate compression resilience whiteness and other silk floss quality indexes of the two methods were analyzed and compared with superior machine-made silk floss processed by commercial way with hydrogen peroxide. The results show that both two processing methods got uniform degumming effect of silk floss and the surface of the single fiber was smooth and the degumming effect was basically the same as that of commercial products prepared with hydrogen peroxide. The sericin residual rate of silk floss was between 3% - 4% which was in line with the requirements of less than 5% of superior silk floss. There was no significant difference between silk floss obtained and commercial superior products in smoothness and whiteness. In conclusion the performance of silk floss in all aspects has reached the standard of superior products that is the sericin content is not more than 5% the impurity content is not more than 0. 1% the compression rate is not less than 45% and the response rate is not less than 92% . Based on the experimental results and analysis it can be concluded that the machine-made silk floss with good performance can be prepared without hydrogen peroxide showing the feasibility of processing machine-made silk floss without hydrogen peroxide which is of great significance to the research and development of a safe and reliable oxidant system for the removal of impurities in silk floss and to further improve the safety of machine-made silk floss production process. © 2022 China Silk Association. All rights reserved.  相似文献   
9.
为改善H型垂直轴风力机(VAWT)的气动特性,文章研究了6种翼型型线改变后的翼型对H型VAWT气动特性的影响,并进行了数值模拟计算和风洞试验。风洞试验验证了模拟计算的结果,证明了型线改变后的风力机对提高气动性有积极的作用。试验结果表明:1波浪型风机和Dimple型风机均可在一定叶尖速比(λ)范围内提高风力机的风能利用率,其中1波浪型风力机在低λ下最高可提高风能利用率13.76%,其单叶片切向力在下游区明显增大;Dimple型风力机在高λ下最高可提高风能利用率14.6%,其单叶片切向力在上游区明显增大。两种改型后的翼型均可改善流动分离,并提高VAWT的气动性能。  相似文献   
10.
Sorption selective catalytic reduction of nitrogen oxides (NOx) (sorption-SCR) has ever been proposed for replacing commercial urea selective catalytic reduction of NOx (urea-SCR), while only the single-stage sorption cycle is hitherto adopted for sorption-SCR. Herein, various multi-stage ammonia production cycles is built to solve the problem of relative high starting temperature with ammonia transfer (AT) unit and help detect the remaining ammonia in ammonia storage and delivery system (ASDS) with ammonia warning (AW) unit. Except for the single-stage ammonia production cycle with MnCl2, other sorption-SCR strategies all present overwhelming advantages over urea-SCR considering the much higher NOx conversion driven by the heat source lower than 100°C and better matching characteristics with low-temperature catalysts. Furthermore, the required mass of sorbent for each type of sorption-SCR is less than half of the mass of AdBlue for urea-SCR. Therefore, the multifunctional multi-stage sorption-SCR can realize compact and renewable ammonia storage and delivery with low thermal energy consumption and high NOx conversion, which brings a bright potential for efficient commercial de-NOx technology.  相似文献   
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