On Media Concentration and the Diversity Question

Corporate mergers and the consolidation of ownership in the American communications arena have long been sources of concern. U.S. regulatory and antitrust policy traditionally attempted to secure a “diversity of voices” structurally, largely through rules regarding ownership. Although the meaning of diversity was always problematic and undertheorized, the Federal Communications Commission long set ceilings on the numbers of broadcast outlets any single person or corporation could own and enacted cross-ownership rules such as a prohibition against a corporation owning a newspaper and broadcast outlets in the same market. These rules, and the FCC's authority to make them, were upheld, occasionally even compelled, by the federal appellate courts. In the last 20 years, however, legal trends, in conjunction with political developments, have undermined the diversity rationales behind ownership rules and associated structural regulations of mass media. Paradoxically, even as media corporations are becoming larger and presumably more powerful, ownership regulations are being rescinded or struck down. This article explains this history. It concludes with a suggestion that the First Amendment metaphor of a marketplace of ideas is misplaced, and of how our thinking about media ownership and diversity might be better served by the metaphor of a mixed media system.     

PCC汽油脱硫工艺分析

根据国家环保要求,预计5年内汽油硫含量不大于200ppm;10年后,汽油琉含量不大干30ppm或10ppm,而降低汽油产品硫含量的关键是降低FCC汽油硫含量,本文就降低FCC汽油硫含量的各种工艺进行了阐述和比较。     

NCC:缘起、发展与现实困境——美国传播通讯监管模式(FCC)的台湾版分析

本文简要介绍了台湾"国家"通讯传播委员会的基本状况,较为详尽地考察了其缘起及发展历程,认为其克隆了美国传播通讯监管的模式.作者得出结论,这种克隆模式是效率较高并且风险较低的变革措施,而NCC在台湾的发展却也存在着很多变数,需要社会政治生态的良性变革.     

催化裂化油浆综合利用的发展趋势

我国催化裂化年加工量超过1.5亿t,每年部分催化裂化油浆外甩量超过750万t。由于催化裂化油浆中有催化剂粉尘、胶质、沥青质、烯烃和稠环芳烃,给催化裂化油浆的综合利用带来许多困难。这几年有很多关于催化裂化油浆综合利用的技术研究报道,但都回避了如何分离脱除烯烃、胶质、沥青质的根本问题。为了综合利用催化裂化油浆,探讨了催化裂化油浆中的组分影响以及其利用现状和发展趋势。     

WARNING—The Existing Media System May Be Toxic to Your Health: Health Communication and the Politics of Media Reform

Our physical health depends, at least in part, upon the health of our media environment. Unfortunately, the commercial media system produces countless messages that not only misinform Americans about their health but also actively promote unhealthy behaviors. Rather than taking the existing media system as a given, this commentary argues that health communication scholars should work with media reformers to transform the media system in ways that advance public health goals. In particular, the ongoing regulatory struggle over low-power radio provides an important opportunity for health communication scholars and media reformers to join forces.     

酸性离子液体脱除柴油中碱性氮的研究

制备了咪唑类酸性离子液体[(CH2)4SO3HMIM][HSO4]用于脱除催化裂化(FCC)柴油中的碱性氮,研究了反应时间、剂油比、反应温度等因素对脱氮效果的影响,确定了较适宜的脱氮条件。结果表明:在反应时间为0.5 h,V(离子液体)/V(柴油)=1/200,反应温度20℃,V(离子液体)/V(水)=1/1条件下,催化裂化柴油脱氮率为86.08%,脱氮后的FCC柴油质量明显改善。     

WARNING—The Existing Media System May Be Toxic to Your Health: Health Communication and the Politics of Media Reform

Our physical health depends, at least in part, upon the health of our media environment. Unfortunately, the commercial media system produces countless messages that not only misinform Americans about their health but also actively promote unhealthy behaviors. Rather than taking the existing media system as a given, this commentary argues that health communication scholars should work with media reformers to transform the media system in ways that advance public health goals. In particular, the ongoing regulatory struggle over low-power radio provides an important opportunity for health communication scholars and media reformers to join forces.     

FCC汽油脱硫新技术

介绍了国内外最新的流化催化裂化（FCC）汽油的脱硫技术，包括催化裂化过程中加脱硫剂、选择性加氢脱硫、水蒸汽催化脱硫、生物脱硫、氧化脱硫、吸附脱硫等。吸附法脱硫具有低投资、低操作成本的优点。化学吸附具有高硫脱除率的优势，可以将汽油中的硫含量降至100μg／g以下，是一种很有发展前途的脱硫技术。     

美国UNE政策失败的原因与启示

本文介绍美国FCC针对电信产业采取UNE规制政策的实践及目的,介绍并分析政策失败的原因。从UNE的规制实践来看,采用指令手段强制在同一市场进行竞争的双方进行不情愿的合作,最终难以达到促进竞争的目的。过分的规制难以奏效,只有解放并依赖市场力量,才有助于竞争局面的形成。针对UNE的失败,本文提出,只有采用多个网络之间相互竞争的方式,才是将竞争引入电信产业的最好方法。     

催化裂化油浆的分离技术进展

催化裂化油浆中含有大量高沸点的重芳烃、饱和烃,可用它制作高等级道路沥青、活性炭纤维、橡-塑软化剂、高温导热油。由于油浆中含有催化剂粉尘、胶质、沥青质、烯烃、稠环芳烃等,这给油浆的综合利用带来许多困难。综合利用油浆必须突破两个关键技术,即要高效分离掉油浆中的催化剂粉末;根据要开发的目标产品分别脱除相关的胶质、沥青质、烯烃和稠环芳烃等。