Review of Operating Experience Of Ozone Systems In Municipal Plants In The United States

The treatment chemical ozone has now been successfully used in the United States in municipal water and wastewater plants for many years. To insure continuous, successful operations of these applications, operating obstacles had to be dealt with and overcome.

In this paper, examples of field operating problems and their solutions are described. The experiences at specific municipal water and wastewater installations are reviewed in detail. Discussed for each example are : the background and effects of the problem, the problem-solving process, and the eventual resolution of the problem. The examples include simple unit operations to entire processes.

By observing the ozone installation's operation several years after start-up, the design of future ozone systems can be improved and operating problems minimized.     

热变形高铌Ti-Al合金获取全片层组织的热处理工艺

研究了热变形高铌Ti-Al合金获取全片层组织的热处理工艺及转变机理,提出了新的热处理工艺为:1480℃×10min→1345℃×20min→900℃×2h,空冷。采用新工艺热处理时可使高铌Ti-Al合金中在β相与α相区两次重新形核长大,破坏了原始变形组织中晶粒间的取向关系,从而得到了均匀的α相,因而新工艺热处理后得到较为均匀细小的全片层组织。     

描述逻辑FL0循环术语集的可满足性

循环术语集是描述逻辑长期以来的研究难点,它的最基本的问题即语义及推理问题没有得到合理的解决。分析了描述逻辑循环术语集的研究现状和存在的问题,基于图的互模拟的方法,给出了描述逻辑FL0循环术语集的可满足性条件。结果证明循环术语集的可满足性的推理是多项式复杂的。     

Flt3 Signaling in B Lymphocyte Development and Humoral Immunity

The Class III receptor tyrosine kinase Flt3 and its ligand, the Flt3-ligand (FL), play an integral role in regulating the proliferation, differentiation, and survival of multipotent hematopoietic and lymphoid progenitors from which B cell precursors derive in bone marrow (BM). More recently, essential roles for Flt3 signaling in the regulation of peripheral B cell development and affinity maturation have come to light. Experimental findings derived from a multitude of mouse models have reinforced the importance of molecular and cellular regulation of Flt3 and FL in lymphohematopoiesis and adaptive immunity. Here, we provide a comprehensive review of the current state of the knowledge regarding molecular and cellular regulation of Flt3/FL and the roles of Flt3 signaling in hematopoietic stem cell (HSC) activation, lymphoid development, BM B lymphopoiesis, and peripheral B cell development. Cumulatively, the literature has reinforced the importance of Flt3 signaling in B cell development and function. However, it has also identified gaps in the knowledge regarding Flt3-dependent developmental-stage specific gene regulatory circuits essential for steady-state B lymphopoiesis that will be the focus of future studies.     

喷雾式荧光灯灯管涂膜装置

本文分析了紧凑型荧光灯光衰的主要原因以及氧化铝保护膜的作用,提出了一种新的涂膜装置,并介绍了在涂膜时应注意的事项。     

Hybrid Fuzzy-particle Swarm Optimization-simplex (F-PSO-S) Algorithm for Optimum Design of PM Drive Couplings

This paper aimed at exploring the use of the proposed hybrid Fuzzy-Particle Swarm Optimization-Simplex (F-PSO-S) algorithm to optimize the structural design of PM couplings subject to several key design constraints. The new proposed hybrid optimization algorithm is constructed based on combining three well-known techniques: fuzzy logic (FL), particle swarm optimization (PSO), and simplex method (SM). FL is used to aggregate different scaling and/or conflicting objectives in one objective function using fuzzy combination operators. On the other hand, the PSO has obvious capabilities in global search whereas the SM has exceptional advantages in local search. As a hybrid algorithm, the F-PSO-S has the outstanding feature of combining the ability of global searching and local canvassing for different scales and/or conflicting objective functions. The proposed algorithm has been applied to permanent magnet (PM) drive couplings. A standard coupling design is used as a good initial point for the conventional SM and to define the performance constraints for the proposed optimization technique. New coupling designs are developed and optimized to show the superior capabilities of the F-PSO-S algorithm as a global optimization technique. The sensitivity analysis is also performed to identify the effects of different design parameters on the coupling performance.     

用于荧光灯管的全新第四代电子源（二）

在荧光灯（FL）管中,人们凭借经验发现了一种全新的电子源,它是高温氩晕空间（HTACS）。HTACS在带有微小BaO颗粒钨丝线圈的受热裸金属斑点上形成,在氩气体空间中,取自处于负电势阴极电极上HTACS的电子,向处于正电势阳极电极上的HTACS运动。在点亮FL管中,来自HTACS的流光电子在所运行ac电压处于正电势期间...     

具有锁频/锁频-锁相两种工作模式的CMOS数字锁相环

提出了一种新型的数字锁相环（DPLL），它具有锁频（FL）和锁频-锁相（FPL）两种工作模式，在FL和FPL两种工作模式下分别可以获得较低的频率抖动和相位噪声。并采用自校准技术，具有快速锁定，低抖动，工作频率范围宽的优点。     

荧光灯管运行时的外部交流驱动电路和内部直流电路（上）

通过对外电极荧光灯（EEFL）的检测发现,在荧光灯管（FL）运行时,两种完全不同的电路（外部AC驱动电路和内部DC电路）并存且合为一体。外部AC驱动电路决定了FL管运行的基本AC功耗,并且仅有内部DC电路决定FL管的亮度。通常所说的FL管的功耗是外部驱动装置的AC功耗,它并不介入FL管运行时的汞原子激发。