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Study on Carrying Capacity of Square shell and Parameter analysis 方形外壳承载能力研究及参数分析
Pub Date : 2024-03-19 DOI: 10.62051/szjhqd26
Peng Wang, Heyun Cao, Qingyong Niu, Hao Zhang
Square shell is one structural type which is quite common to be seen in engineering. This paper focuses on the carrying capacity of square shell, and studies the influence of round radius and shell thickness on the ratio of mass to external volume and load factor under linear buckleing of shell. Numerical results show that, With the increase of round radius, the ratio will first decrease, then increase and approach that of circular shell, while the load factor will also increase. With the increase of shell thickness, the ration of shell will increase and the load factor will rapidly increase. This will help to better design of pressure hull of submarines.
方壳是工程中常见的一种结构类型。本文以方壳的承载能力为研究对象,研究了圆半径和壳厚对壳体线性屈曲下质量与外部体积之比以及荷载系数的影响。数值结果表明,随着圆形半径的增大,质量与外部体积之比会先减小后增大,并接近圆形壳体的质量与外部体积之比,同时载荷系数也会增大。随着壳体厚度的增加,壳体的比值会增大,载荷系数也会迅速增加。这将有助于更好地设计潜艇的压力壳体。
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引用次数: 0
Application of low-temperature plasma technology in the field of agriculture 低温等离子体技术在农业领域的应用
Pub Date : 2024-03-19 DOI: 10.62051/612yer59
Bo Zhang
The low-temperature plasma crop seed treatment technology has opened up a new way for the application of plasma in crops, creating a new path for high and stable yield of crops, and enriching agricultural yield increasing technology. This article briefly describes the innovative development of low-temperature plasma seed treatment technology, introduces the series of applications of plasma technology in crop seeds, as well as the biological effects and activation mechanisms of plasma. It also looks forward to the development and application prospects of plasma seed treatment technology.
低温等离子体农作物种子处理技术开辟了等离子体在农作物中应用的新途径,为农作物高产稳产开创了一条新路,丰富了农业增产技术。本文简述了低温等离子体种子处理技术的创新发展,介绍了等离子体技术在农作物种子上的一系列应用,以及等离子体的生物学效应和活化机理。同时展望了等离子体种子处理技术的发展和应用前景。
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引用次数: 0
Review of heat pipes for power batteries of new energy vehicles 新能源汽车动力电池热管评述
Pub Date : 2024-03-19 DOI: 10.62051/x8pfha37
Yuchen Huang
With the global energy crisis becoming one of the most concerned topics, the application of new energy systems has become the most popular research at present. In addition, with the emerging new energy vehicles, problems such as high calorific value and insufficient heat dissipation performance of lithium batteries for new energy vehicles have not been solved, so the research on thermal management technology of lithium batteries is essential. Based on the analysis of heat pipe research, this paper summarizes heat pipe from three aspects, including structure and arrangement of the heat pipe, wall materials of the heat pipe and phase change materials of the heat pipe. This paper puts forward new insights and provides a reference for the research on the thermal management of lithium batteries for new energy vehicles.
随着全球能源危机成为最受关注的话题之一,新能源系统的应用已成为当前最热门的研究方向。此外,随着新能源汽车的不断涌现,新能源汽车用锂电池热值高、散热性能不足等问题尚未得到解决,因此锂电池热管理技术的研究必不可少。本文在分析热管研究的基础上,从热管的结构与布置、热管壁材、热管相变材料三个方面对热管进行了总结。本文提出了新的见解,为新能源汽车锂电池的热管理研究提供了参考。
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引用次数: 0
Stress Analysis of Semi-covered Excavation Foundation Pit in Metro Stations based on Incremental Method 基于增量法的地铁站半覆盖开挖基坑应力分析
Pub Date : 2024-03-19 DOI: 10.62051/mprbdy35
Xuebo Qin, Aici Jiang, Zhongao Wei
The station foundation pit of Ningbo Metro Line 2 is taken as engineering background, the support structure form of the semi covered excavation foundation pit is introduced. The standard section of the foundation pit is considered as a plane strain problem, a force calculation and analysis model for the half cover system structure is established based on the incremental method, concentrated load of a waste truck is applied within 5.0 m cover plate range outside the middle column and an impact coefficient of 0.4 is considered, overload with value of 20kPa is applied to the rest parts of the cover plate and 5.0 m outside the diaphragm wall. The excavation of the foundation pit is divided into 5 stages, the surface overload, structural self weight, soil pressure and elastic resistance increment, and support axial force are applied respectively, and the bending moment increment of the connecting wall and cover plate system at each excavation stage are calculated. The bearing capacities of the diaphragm wall and cover plate reinforcement are respectively calculated based on the rectangular bending normal section components, and they both meet the strength requirements.
以宁波地铁 2 号线车站基坑为工程背景,介绍了半盖挖基坑的支护结构形式。基坑标准段考虑平面应变问题,基于增量法建立半盖体系结构受力计算分析模型,在中柱外侧 5.0 米盖板范围内施加垃圾车集中荷载,考虑冲击系数为 0.4,在盖板其余部分及地下连续墙外侧 5.0 米处施加超载,超载值为 20kPa。基坑开挖分为 5 个阶段,分别施加地表超载、结构自重、土压力和弹性阻力增量、支护轴力,计算每个开挖阶段连墙和盖板系统的弯矩增量。连续墙和盖板钢筋的承载力分别根据矩形弯曲法向截面构件计算得出,均满足强度要求。
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引用次数: 0
Research and Application of New energy Digital System Based on BIM 基于 BIM 的新能源数字化系统研究与应用
Pub Date : 2024-03-19 DOI: 10.62051/cwawkn88
Runbiao Liu, Jihong Guo, En-Zhi Cao, Qichao Tang
With the continuous development of new energy technology, the installed scale of new energy is getting bigger and bigger, the market competition is becoming increasingly fierce, and the cost control of investment units, reference units and manufacturers in all aspects of new energy construction is becoming more and more strict. Promoting the application of BIM in new energy engineering projects can effectively reduce the cost in the design and construction stages, and more importantly, improve the efficiency of long-term operation of new energy power stations, and reduce capital investment. This paper focuses on the definition and development of BIM, key technologies and BIM-based new energy digital system, which manages the information model of new energy power generation projects, provides more effective and accurate management, and improves project operation efficiency.
随着新能源技术的不断发展,新能源装机规模越来越大,市场竞争日趋激烈,投资单位、参建单位、生产厂家在新能源建设各个环节的造价控制越来越严格。在新能源工程项目中推广应用 BIM,可以有效降低设计和施工阶段的成本,更重要的是可以提高新能源电站长期运营的效率,减少资金投入。本文重点介绍了 BIM 的定义和发展、关键技术以及基于 BIM 的新能源数字化系统,该系统管理新能源发电项目的信息模型,提供更有效、更准确的管理,提高项目运营效率。
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引用次数: 0
Research progress of molecular sieve supported catalysts in catalytic oxidation of chlorine-containing volatile organic compounds 分子筛支撑催化剂在含氯挥发性有机化合物催化氧化中的研究进展
Pub Date : 2024-03-19 DOI: 10.62051/tabdys69
Chunyan Feng
Chlorinated Volatile Organic Compounds (CVOCs) come from a wide range of sources and are common precursors of PM2.5 and ozone pollution, which pose a serious threat to the environment and have adverse effects on human health. Catalytic degradation is one of the effective methods to solve CVOCs pollution, which has the advantages of low operating temperature, less chlorine-containing by-products and high degradation efficiency. The core of this technology is to design and develop catalyst materials with excellent stability and catalytic performance. At present, molecular sieve catalysts have attracted extensive attention because of their acidity and unique pore structure. In this paper, the current research status of catalysts supported by molecular sieve, such as noble metals, transition metal oxides and perovskites, and their activity, acidity, stability and selectivity in CVOCs catalytic reactions were summarized and analyzed, and the future development direction of CVOCs molecular sieve supported catalysts was prospected.
氯化挥发性有机化合物(CVOCs)来源广泛,是 PM2.5 和臭氧污染的常见前体物,对环境构成严重威胁,并对人类健康产生不利影响。催化降解是解决 CVOCs 污染的有效方法之一,具有操作温度低、含氯副产物少、降解效率高等优点。该技术的核心是设计和开发具有优异稳定性和催化性能的催化剂材料。目前,分子筛催化剂因其酸性和独特的孔结构而受到广泛关注。本文总结分析了贵金属、过渡金属氧化物和过氧化物等分子筛支撑催化剂的研究现状及其在 CVOCs 催化反应中的活性、酸性、稳定性和选择性,并展望了 CVOCs 分子筛支撑催化剂的未来发展方向。
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引用次数: 0
Study on large scale direct shear test on soil-rock mixture with multiple grain grades in high fill slope engineering 高填方边坡工程中多粒级土岩混合物的大型直接剪切试验研究
Pub Date : 2024-03-19 DOI: 10.62051/vf0cw887
Chao Zheng, Shuxiang Song, Nan Zhang, Kangwei Xiong
Soil-rock mixtures are multiphase natural geological materials composed of mineral particles of multiple grain sizes, and have significant natural characteristics of multiscale material groups. In order to investigate the shear strength characteristics and deformation failure characteristics of soil-rock mixtures with multiple grain sizes under in-situ conditions in fill engineering, samples of soil-rock mixtures with multiple grain sizes under in-situ conditions were prepared, and large-scale in-situ direct shear tests were conducted under natural and water-soaked conditions. The test results showed that the shear strength of soil-rock mixtures is relatively high, and after saturated by water immersion, its shear strength decreases significantly, mainly manifested in the decrease of internal friction angle while the cohesion remains basically unchanged. The cohesion of soil-rock mixtures with multiple grain sizes is mainly provided by the shear-breaking cohesion of coarse particles such as gravel in the soil-rock mixture, and its degree of exertion is controlled by the grading characteristics and particle morphology of the soil-rock mixture and affected by constraints. The reason for the significant decrease in shear strength of soil-rock mixtures with multiple grain sizes after water-soaked saturation can be explained as follows: the clay film covering the surface of coarse particles becomes soft after water immersion, resulting in a significant decrease in the sliding friction resistance between coarse particles and the clay film, as well as the occlusion friction resistance generated by the rotation transfer between coarse particles through the clay film interface.
土岩混合物是由多种粒度矿物颗粒组成的多相天然地质材料,具有显著的多尺度材料群天然特征。为了研究多粒级土岩混合物在填土工程中原位条件下的抗剪强度特征和变形破坏特征,制备了多粒级土岩混合物原位条件下的样品,并在自然条件和水浸泡条件下进行了大规模原位直接剪切试验。试验结果表明,土岩混合物的抗剪强度较高,经水浸泡饱和后,抗剪强度明显下降,主要表现为内摩擦角减小,而内聚力基本保持不变。多粒径土石混合物的内聚力主要由土石混合物中砾石等粗颗粒的剪切破坏内聚力提供,其发挥程度受土石混合物的级配特征和颗粒形态控制,并受制约因素影响。多粒径土岩混合物在浸水饱和后抗剪强度显著下降的原因可以解释为:粗颗粒表面覆盖的粘土膜在浸水后变得松软,导致粗颗粒与粘土膜之间的滑动摩擦阻力以及粗颗粒之间通过粘土膜界面旋转传递产生的闭塞摩擦阻力显著下降。
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引用次数: 0
Ceramic membrane - ozonation coupling process: research prospect of membrane fouling 陶瓷膜-臭氧耦合工艺:膜污垢的研究前景
Pub Date : 2024-03-19 DOI: 10.62051/eyzsz110
Haipeng Xi
Ceramic membrane - ozonation coupling is a promising wastewater treatment process, which combines the functions of membrane filtration rejection and advanced oxidation degradation. Abundant experimental studies have been carried out on this coupling system, but there is still a lack of comprehensive review. In this paper, the latest progress of this system is reviewed. Firstly, the configuration of the coupling system is briefly introduced. Then, the mechanism of the system is introduced. In particular, the structural characteristics of the CM are discussed. Finally, the formation type and prevention of membrane fouling are discussed and emphasized.
陶瓷膜-臭氧耦合是一种前景广阔的废水处理工艺,它结合了膜过滤排斥和高级氧化降解的功能。有关该耦合系统的实验研究已经开展了很多,但仍然缺乏全面的综述。本文对该系统的最新研究进展进行了综述。首先,简要介绍了耦合系统的构型。然后,介绍了该系统的机理。特别是讨论了 CM 的结构特征。最后,讨论并强调了膜污垢的形成类型和预防方法。
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引用次数: 0
Development, Prospect and Challenge for Additive Manufacturing of Polymer Materials 聚合物材料增材制造的发展、前景和挑战
Pub Date : 2024-03-19 DOI: 10.62051/s182f353
Ruixue Miao
As a manufacturing technology that fabricates three-dimensional objects by stacking materials layer by layer, additive manufacturing can be divided into laser fused deposition, electron beam fused deposition, inkjet printing and so on based on different additive manufacturing processes. In recent years, remarkable progress has been made in the additive manufacture of polymer materials. Firstly, the additive manufacturing equipment and process parameters suitable for polymer materials have been successfully developed, which realized the accurate manufacturing of complex structures. Secondly, by optimizing the formula and post-treatment of polymer materials, the performance and durability of additive products are improved. In addition, the researchers also explored the application potential of additive manufacturing of polymer materials in medical, aerospace and other fields. However, the additive manufacturing of polymer materials still faces some challenges. One of them is that the rheological properties of polymer materials have a great impact on the progress of additive manufacturing, which needs further research and improvement. Meanwhile, the heat and stress generated in additive manufacturing may lead to the deformation and degradation of polymer materials, which requires effective thermal management. Finally, compared with the traditional cutting process, the additive manufacturing cost of polymer materials is still high, so it is necessary to reduce the cost and promote production efficiency. In a word, additive manufacturing of polymer materials has broad prospects and application potential, but further research and improvement are still needed to overcome related challenges.
作为一种通过逐层堆叠材料制造三维物体的制造技术,增材制造根据不同的增材制造工艺可分为激光熔融沉积、电子束熔融沉积、喷墨打印等。近年来,高分子材料的增材制造取得了显著进展。首先,适合高分子材料的增材制造设备和工艺参数已经研制成功,实现了复杂结构的精确制造。其次,通过优化高分子材料的配方和后处理,提高了增材制造产品的性能和耐久性。此外,研究人员还探索了聚合物材料增材制造在医疗、航空航天等领域的应用潜力。然而,聚合物材料的增材制造仍面临一些挑战。其中之一就是高分子材料的流变特性对增材制造的进展影响很大,需要进一步研究和改进。同时,增材制造过程中产生的热量和应力可能会导致高分子材料变形和降解,这就需要有效的热管理。最后,与传统切割工艺相比,高分子材料的增材制造成本仍然较高,因此有必要降低成本,提高生产效率。总之,高分子材料增材制造具有广阔的发展前景和应用潜力,但仍需进一步研究和改进,以克服相关挑战。
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引用次数: 0
Research on p order nonlinear half wave Schrödinger equations p 阶非线性半波薛定谔方程研究
Pub Date : 2024-03-19 DOI: 10.62051/cbbwpx39
Xiaoli Zhao
The objective of our research is to scrutinize the presence and singularity of the comprehensive potent solution for the half-wave Schrödinger equation characterized by  order. Take into account the nonlinear half-wave Schrödinger equations represented by  order: . We apply the Brezis-Gallouet style inequality to attain a logarithmic form of regulation. These rationales will be pivotal in validating our primary theorem within Global Well-Posedness. When discussing global Solutions, we infer the solutions for Schrödinger equations within the  realm when . Specifically, when , we leverage the Strichartz estimations alongside inequalities following the Brezis-Gallouët pattern to ascertain the well-posedness of Schrödinger equations within the  framework. To elucidate the global well-posedness of Schrödinger equations in the energy subspace , we undertake a traditional tactic to craft the frail solution within the  realm, succeeded by the application of a rationale found in existing academic literature to verify the singularity of the frail solution. The coherent progression of the frail solution is derived from the sustained conservation of both mass and energy elements. An analogous strategy is likewise harnessed to affirm the global well-posedness of Schrödinger equations in the  sphere when .
我们的研究目标是仔细研究以阶为特征的半波薛定谔方程的综合强解的存在性和奇异性。考虑到以阶为代表的非线性半波薛定谔方程: 。我们应用布雷齐斯-加洛特式不等式来实现对数形式的调节。这些原理将在验证我们的全局完备性主要定理中起到关键作用。在讨论全局求解时,我们会推断薛定谔方程在......时的求解。具体来说,当 ,我们利用斯特里查兹估计和布雷齐斯-加卢埃模式的不等式来确定薛定谔方程在框架内的好摆性。为了阐明薛定谔方程在能量子空间中的全局好摆性,我们采用传统的方法在该领域内建立脆弱解,然后应用现有学术文献中的原理来验证脆弱解的奇异性。脆弱解的连贯进展源自质量和能量元素的持续守恒。当......或......时,类似的策略同样可用于确认薛定谔方程在球体中的全局好求解性。
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引用次数: 0
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Transactions on Environment, Energy and Earth Sciences
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