对凝结水处理用离子交换树脂的有机溶出物的研究

对具有代表性的凝结水处理阳、阴各十种离子交换树脂有机溶出物的量及溶出规律进行了测定,同时就阳树脂溶出物对阴离子交换树脂的污染,以及通过再生、碱性盐水复苏对此污染的去除,也作了试验测定。     

纳米阵列铂电极的样模法制备与应用

双多孔氧化铝为样模,利用直流沉积法自组装纳米阵列Ｐｔ电极。该电极在Ｆｅ（ＣＮ）＾４－６溶液中的线性扫描伏安图呈现Ｓ型稳态曲线,对甲醇的氧化具有很高的电催化活性。另外,以该电极作为表现增强拉曼散射的活性基底,现场研究甲醇的电化学氧化过程,检测出中间产物单端吸附的ＣＯ。     

燃料电池用高温质子交换膜

与传统质子交换膜燃料电池相比,高温质子交换膜燃料电池(HT-PEMFCs)不仅可以提高催化剂对CO的耐受能力,还能简化水热管理,提高能量转化效率。高温质子交换膜是实现高温操作的关键部件之一。掺杂无机磷酸的高温质子交换膜因为在高温度(100~200 ℃)和低相对湿度下具有较高的质子传导率,以及较长使用寿命而成为研究的热点。高的磷酸掺杂量有助于质子传导率的提升,但也会牺牲膜的机械强度,因此已有大量致力于提升膜综合性能的改性研究。本文对目前基于磷酸基的聚苯并咪唑类、聚芳醚类等高温质子交换膜的改性策略进行评述,并梳理总结了包括 MOFs、COFs 在内的新型多孔材料在质子交换膜领域的应用,最后指出了高温质子交换膜当前面临的挑战。     

Indefinite stochastic LQ control with cross term via semidefinite programming

An indefinite stochastic linear-quadratic (LQ) optimal control problem with cross term over an infinite time horizon is studied, allowing the weighting matrices to be indefinite. A systematic approach to the problem based on semidefinite programming (SDP) and related duality analysis is developed. Several implication relations among the SDP complementary duality, the existence of the solution to the generalized Riccati equation and the optimality of LQ problem are discussed. Based on these relations, a numerical procedure that provides a thorough treatment of the LQ problem via primal-dual SDP is given: it identifies a stabilizing optimal feedback control or determines the problem has no optimal solution. An example is provided to illustrate the results obtained.     

Indefinite stochastic optimal LQR control with cross term under IQ constraints

A stochastic optimal LQR control problem under some integral quadratic (IQ) constraints is studied, with cross terms in both the cost and the constraint functionals, allowing all the control weighting matrices being indefinite. Sufficient conditions for the well-posedness of this problem are given. When these conditions are satisfied, the optimal control is explicitly derived via dual theory.     

电解液浓度对氢化物电极性能的影响

镍/氢化物(Ni/MH)电池以其洁净、安全、高容量、大功率、长寿命而受到人们的极大关注。贮氢电极材料的研究是开发Ni/MH电池的中心,已有较多报道。Boonstra等研究了氧化、粉末的处理等对LaNi_5电极性能的影响。本文探讨电解液浓度对MLNi_(3.5)MnCO_(0.4)Al_(0.1)(ML代表富镧混合稀土)电极放电性能的影响,并对其循环伏安性能进行了研究。 贮氢合金是在氩气保护下,将计量比的各组成元素ML、Ni、Mn、Co、Al混合物在高频感应     

Al含量对MLNi4—xMnAlx贮氢电极性能的影响

在稀土镍合金贮氢电极(MH)的研究中,曾报道电解液浓度对MLNia_(3.5)MnCo_(0.4)Al_(0.1)(ML代表富镧混合稀土)电极放电性能的影响。本文报道Al含量对MLNi_(4-x)MnAl_x电极性能的影响,并用循环伏安法对电极反应机理进行了探讨。实验方法同前报。 结果与讨论 MLNi_(4-x)MnAl_x电极性能测试 用100mA/S恒电流将MLNi_(4-x)MnAl_x电极充电至300mAh/g,停充10分钟,再用100mA/g恒电流放电至—0.60V(vs Hg/HgO),得如图1的放电曲线。可见随     

The Neuroprotective Effect of Tea Polyphenols on the Regulation of Intestinal Flora

Tea polyphenols (TPs) are the general compounds of natural polyhydroxyphenols extracted in tea. Although a large number of studies have shown that TPs have obvious neuroprotective and neuro repair effects, they are limited due to the low bioavailability in vivo. However, TPs can act indirectly on the central nervous system by affecting the “microflora–gut–brain axis”, in which the microbiota and its composition represent a factor that determines brain health. Bidirectional communication between the intestinal microflora and the brain (microbe–gut–brain axis) occurs through a variety of pathways, including the vagus nerve, immune system, neuroendocrine pathways, and bacteria-derived metabolites. This axis has been shown to influence neurotransmission and behavior, which is usually associated with neuropsychiatric disorders. In this review, we discuss that TPs and their metabolites may provide benefits by restoring the imbalance of intestinal microbiota and that TPs are metabolized by intestinal flora, to provide a new idea for TPs to play a neuroprotective role by regulating intestinal flora.     

惯性约束聚变中内爆混合的模型构建

从热斑质量方程和能量守恒方程入手,重新计算考虑混合后聚变燃料的比内能和比热容等热力学参数,分析混合效应在轫致辐射损失等能量输运方面的作用,构建有杂质混合情况的热斑燃烧动力学模型.根据静态模型中的热斑燃烧的功率平衡条件,研究烧蚀层杂质混合比例与点火阈值和热斑自持燃烧的关系.理论分析和数值计算表明,混合效应导致热斑中的轫致辐射增强是点火失败的重要因素之一.通过调整不同掺杂材料、混合浓度及混合方式,得到壳层混合与热斑面密度、热斑离子温度的演化之间的关系.最后,基于模拟结果给出两种降低混合影响的方法.