一类随机蚊虫种群模型及其渐近性态

基于沃尔巴克氏菌影响下的确定性蚊虫种群模型,考虑受感染的蚊虫出生率受到环境中随机噪声的影响,建立了一类新的随机蚊虫种群模型,并研究了该随机模型的适定性和长时间渐近性态.首先,通过伊藤公式并选用适当的李雅普诺夫函数,证明了全局正解的存在唯一性;其次,定义此模型的基本再生数R0,证明了当R0<1时,受感染的蚊虫数将趋于灭绝;接着,给出模型随机平均持久的充分条件;最后,通过一个数值例子说明了定理的应用.     

云制造环境下新能源汽车供应链协同制造模式

为了解决新能源汽车制造企业生产能力资源非均衡低匹配的问题,提出云制造环境下新能源汽车供应链协同制造模式,构建了这一模式下的体系架构,并交代了云制造环境下新能源汽车供应链协同制造模式的运作流程,且分析了这一制造模式下时间、成本和价格等方面的优势,也更进一步表明这一制造模式实现的必要性,为新能源汽车的生产制造提供了一种新的途径.     

Technology for recycling and regenerating graphite from spent lithium-ion batteries

With the annual increase in the amount of lithium-ion batteries (LIBs), the development of spent LIBs recycling technology has gradually attracted attention. Graphite is one of the most critical materials for LIBs, which is listed as a key energy source by many developed countries. However, it was neglected in spent LIBs recycling, leading to pollution of the environment and waste of resources. In this paper, the latest research progress for recycling of graphite from spent LIBs was summarized. Especially, the processes of pretreatment, graphite enrichment and purification, and materials regeneration for graphite recovery are introduced in details. Finally, the problems and opportunities of graphite recycling are raised.     

关于高压电气设备带电检测信息化管理的研究

随着电力系统的发展,对发电、输电、供电和用电的可靠性要求越来越高,高压电气设备状态检测也尤显重要.建立了一种智慧仪器仪表在线检测智能运检平台,制定统一的数据传输规范,实现检测数据终端分析、检测结果线上管理,全面提升电力设备带电检测试验工作水平,支撑泛在电力物联网重要战略部署.     

玻璃熔窑烟气高温脱硫除尘脱硝一体化工艺

针对玻璃熔窑传统烟气处理工艺存在的问题,阐述高温脱硫除尘脱硝一体化工艺流程及其在玻璃生产中烟气处理的应用优势,分析其关键设备陶瓷催化剂袋式过滤器的工艺原理和优缺点,为玻璃行业的烟气净化提供更加一体化的处理方案.     

Preparation of High Strength and Toughness Aramid Fiber by Introducing Flexible Asymmetric Monomer to Construct Misplaced-Nunchaku Structure

High performance fibers with high strength and toughness have great potential in composites, but contradiction between tensile strength and elongation at break makes the preparation to become a current challenge. Herein, an asymmetric structure of more flexible diamine, 3,4′-diaminodiphenyl ether (3,4′-ODA), is introduced into heterocyclic aramid (PBIA) fibers to replace rigid symmetric p-phenylenediamine (PDA). By studying the properties of copolymer (mPEBA) fibers with different ratios of diamine, it is found that the mPEBA fiber reached the optimal mechanical properties with the 30% content of 3,4′-ODA. Compared with homopolymerized heterocyclic aramid fibers, the tensile strength and elongation at break of mPEBA fiber are improved by 26.2% and 38.7%, respectively. Results of X-ray diffraction show that the introduction of 3,4′-ODA structure can increase stretchability of mPEBA fibers, improving the orientation degree during hot-drawing. Molecular dynamics simulations confirm that 3,4′-ODA structure undergoes a conformation transformation to form a straightened chain during hot-drawing, while symmetrical 4,4′-diaminodiphenyl ether (4,4′-ODA) cannot form the same conformation. The misplaced-nunchaku structure is formed based on the special meta-para position of 3,4′-ODA, achieving the synergy of high strength and high toughness.     

A Dual Physical Cross-Linking Strategy to Construct Tough Hydrogels with High Strength,Excellent Fatigue Resistance,and Stretching-Induced Strengthening Effect

Hydrogels with excellent stiffness, toughness, anti-fatigue, and self-recovery properties are regarded as promising water-containing materials. In this work, a dual physically cross-linked (DPC) sodium alginate (SA)/poly[acrylamide (AAm)-acrylic acid (AAc)-octadecyl methacrylate (OMA)]-Fe³⁺ hydrogel is reported, which is constructed by hydrophobic association (HA) and ionic coordination (IC). The optimal DPC hydrogel demonstrates excellent mechanical performance: tensile modulus of 0.65 MPa, tensile strength of 3.31 MPa, elongation at break of 1547%, and toughness of 27.8 MJ m^–3. SA/P(AAm-AAc-OMA)-Fe³⁺ DPC hydrogels also exhibit prominent anti-fatigue and self-recovery performance (99.1–109.7% modulus recovery and 90.4–108.9% dissipated energy recovery after resting for 5 min without additional stimuli at ambient temperature) through the reconstruction of reversible physical cross-linking. Some of the SA/P(AAm-AAc-OMA)-Fe³⁺ DPC hydrogels even exhibit a stretching-induced strengthening effect, which is similar to the performance of muscle—“the more training, the more strength.” Hence, the combination of HA and IC will provide an effective approach to design DPC hydrogels with desirable mechanical performances and a longer service life for wider applications of soft materials.     

Effects of can parameters on canned—forging process of TiAl base alloy（Ⅱ）——Mechanical behavior

1　ＩＮＴＲＯＤＵＣＴＩＯＮＴｉＡｌａｌｌｏｙｈａｓｌｏｎｇｂｅｅｎｃｏｎｓｉｄｅｒｅｄａｓａｐｒｏｍｉｓ ｉｎｇｍａｔｅｒｉａｌｆｏｒｈｉｇｈｔｅｍｐｅｒａｔｕｒｅａｐｐｌｉｃａｔｉｏｎ ,ｄｕｅｔｏｉｔｓｅｘｃｅｌｌｅｎｔｈｉｇｈｔｅｍｐｅｒａｔｕｒｅ ｐ     

在Fe-Al-C系统中合成优质Ⅱa型宝石级金刚石单晶

和优质Ib型宝石级金刚石单晶生长相比，作为当今高温高压晶体生长的一种高精尖技术，优质1／a型宝石级金刚石单晶对合成技术提出了更高更苛刻的要求：枢研究从晶体的生长速度出发，发现一开始阶段（大约几个小时）的晶体生长速度对优质宝石级金刚石单晶的后期生长争关重要。埘Fe-Al-C系统（Al含量不大于2．5wt％）来说，采用多品种法将晶体开始阶段的晶体生长速度由1．5mg／h降至0．5mg／h后，对生长过程中金属包裹体的进入有了明显的抑制作用，晶体的质量有了很大提高。从晶体中包裹体的存任形式来看，为了获得优质Ⅱa型宝石级金刚石单晶，在触媒中人为地添加除氮剂给晶体生长过程中的排杂过程带来了很大的难度：为了更好的实现排杂，必须很好的处理晶体表面的径向平铺生长速度和晶体轴向的堆积生长速度之间的火系。     

Progress in flotation de-silica

1　INTRODUCTIONBayer sprocessisatypicalmethodtoproducea luminumoxidefrombauxite .Forthediasporic baux ite ,theBayer sprocesscaneconomicallyproducealu minumoxideonlywhenthemassratioofAl2 O3toSiO2 >10 .However ,inChina ,thealuminumoxidewasmainlyproducedbyusing“sinteringprocess”or“in parallelBayer sinteringcombination process”technologiesbecausethediasporic bauxiteischarac terizedbyhighcontentofaluminumoxideandsilicabutlowAl2 O3/SiO2 (average 5 6 ) .Thesetwotech nologieshavetheproble…