英国威格斯450CA30PEEK产品介绍：
450CA30PEEK (聚醚醚酮)是由二氟二苯甲酮与对苯二酚在碱金属碳酸盐存在下，以二苯砜作溶剂进行缩合反应制得的一种新型半晶态芳香族热塑性工程塑料。250度以下有极好的介电性能,抵抗能量射线照射是它的特点。应用领域：电子元件,医疗电子,**,制药和食品加工业,各种生产线用零部件等。
英国威格斯450CA30PEEK产品特性：
PEEK成为轴承级塑料。其优越的摩擦性能（低摩擦系数、耐磨损、较高的峰压限）使得此级别的摩擦应用领域成为理想材料。有更好的刚性和抗蠕变性能,以及更佳的尺寸稳定性,制造结构性零件较为理想。在高温下可长时间地承受固定负荷。
英国威格斯450CA30 PEEK详解：
We show that the converse result of thesefour authors can be recovered from our single-letter
outer bound, while the Berger-Tung outer bound contains points thatlie outside the true rate-distortion region.
The converse results used to solve all of the other special cases mentioned so far are also conse ofour bound. This is discussed in Section 4. Our outer boundtherefore serves to unify most of what is known about thenonex-istence of multiuser source codes. This unification isnoteworthy in the case of Oohama [13] and Prabhakaran, Tse, andRamchandran [14] because the connec-tion between their remarkableconverse result and the classical discrete results inthis area isnot immediately apparent. As we will see, subject to sometechnicalcaveats, most of the key results in multiterminal sourcecoding can be recoveredby combining the generalinner bound described earlier with the outer bounddescribed next.