文章通过对PCC网络架构的研究,总结运营商PCC网络部署原则及组网方案,归纳PCC网络建设需关注问题。

Based on the research of the PCC network architecture, this paper summarizes the operators’ PCC network deployment principles and networking schemes. The problems which should be concerned in the PCC network construction are also summed up.

采用阳离子淀粉对轻质碳酸钙(以下简称PCC)进行改性,研究了阳离子淀粉用量、温度、时间和搅拌速度对改性效果的影响。通过单因素实验结果确定出最佳改性条件:阳离子淀粉用量30%(相对于PCC质量),温度90℃,改性时间60min,搅拌速度为500r/min。对改性PCC进行SEM表征,证明了阳离子淀粉成功地包覆在PCC表面。同时进一步研究改性PCC和未改性PCC对纸张抗张强度、撕裂强度性能的影响。结果表明,在相同加填条件下,加填改性PCC的纸张抗张强度、撕裂强度性能优于加填未改性PCC的以及PCC和淀粉分别加填的。

This paper aimed at precipitated calcium carbonate (hereinafter referred to as PCC) modiifcation with cationic starch, and the effects of cationic starch dosage, temperature, reaction time and agitating speed on modification results. The suitable modification conditions were decided through single factor experiments. Cationic starch dosage 30%(quality relative to PCC), temperature 90℃, modification time 60 min, and agitating speed 500 r/min were proved to be the best modification conditions. The SEM characterization of the modiifed PCC proved that the PCC surface is successively coated with cationic starch. Meanwhile the effects of modiifed and unmodiifed PCC on the paper tensile strength and tear strength properties were compared. The experimental results showed that under the same papermaking conditions, the tensile strength and tear strength properties of the paper iflled with the modiifed PCC are quite better than those iflled with the unmodiifed PCC or PCC and starch ad

通过测定铜基铂对放射性碘的吸附和洗脱性能，探索铂对铜基铂（PCC）性能的影响。在含有亚硫酸钠的稀硫酸介质中，采用柱层析技术测定了PCC对I-的吸附容量、洗脱效率。结果表明：氯铂酸用量在2mL时合成的PCC对I的工作吸附容量可达0．224mg／g（I与Cu的质量比），吸附效率大于99％。以15mL0．1mol／L氢氧化钠溶液洗脱铜基铂，洗脱效率在95％以上。

The adsorption and elution properties of platinum-coated copper (PCC) for radio-active iodine have been revealed and the effects of platinum on the performance of PCC were explored .In sulfuric acid medium containing sodium sulfite ,the adsorption capacity ,elu-tion efficiency of PCC and the effect of platinum on PCC were determined by column chro-matography .The results showed that the adsorption capacity of PCC prepared with 2 mL chloroplatinic acid or more for I - was up to 0 .224 mg/g with the adsorption efficiency of more than 99% while the elution efficiency was more than 95% by 15 mL 0 .1 mol/L sodium hydroxide solution .

通过针对PCC技术在防火墙/NAT场景下应用的问题进行分析,提出了两种解决方案,并详细说明了这两种方案的流程和优缺点,可以解决PCC系统在部署时与现有防火墙系统的共存问题,从而也解决了私网地址用户的业务无法管控的问题。

Based on the analysis of PCC technology applications in mobile network with firewall/NAT, two solutions are put forward of which flows, advantages and deficiencies are analyzed. These two solutions can solve the coexistence of the PCC system and the existing firewall system when PCC system is deployed. In addition, the service control of the private address users is solved as well.

为了解白泥与PCC对AKD施胶性能的影响机理,对比分析了白泥和商品PCC的差异,从不同方面研究其对AKD施胶影响的原因。结果表明,白泥与PCC在粒度分布、晶体结构、杂质含量等方面都有较大差异,对AKD施胶有不同程度的影响。

To find out the inhibition factors on alkyl ketene dimer sizing performance of paper using white mud compared with PCC. We compared and analyzed the difference between white mud calcium carbonate and commodity PCC, and studied this difference to find out the inhibition factors. The result showed that it has bigger difference in white mud and PCC about size distribution, crystal structure, impurity content, etc. And these factors have different degrees of influence on alkyl ketene dimer sizing performance of paper with calcium carbonate.