Hexo

¶Hot Animals Around the World: Chameleons Every few months this program will feature an animal which has caught the eye of the world’s public to become a favorite or “hot” animal. In the first of this unusual series, we will look at the chameleon, one of nature’s strangest creatures. Perhaps no other group of animals has caught mankind’s imagination like reptiles . Among the several subclasses (or “orders” in biology) of reptiles are snakes and lizards , turtles and tortoises , croc...

¶The Dark History of Zombies Animated corpses appear in stories all over the world throughout recorded history. But zombies have a distinct lineage—one that traces back to Equatorial and Central Africa. The first clue is in the word “zombie” itself. Its exact etymological origins are unknown, but there are several candidates. The Mitsogho people of Gabon , for example, use the word “ndzumbi” for corpse. The Kikongo word “nzambi” refers variously to the supreme being, an ancestor wi...

¶WHY THE COVID DENIERS WON Lessons from the pandemic and its aftermath(by David Frum, a staff writer at the Atlantic) Five years ago, the coronavirus pandemic struck a bitterly divided society . Americans first diverged over how dangerous the disease was: just a flu (as President Donald Trump repeatedly insisted) or something much deadlier. Then they disputed public-health measures such as lockdowns and masking; a majority complied while a passionate minority fiercely resisted. Fin...

¶Indoor Pollution So you think that by staying at home you are safe from all the terrible kinds of pollution present outdoors, such as in or near factories, roads, and garbage dumps ? Do you think that by staying in your office you are breathing cleaner, safer air than when you go outside for lunch or are on the way back home from work? Think again. Recent research done at the University of Texas has shown that staying indoors may actually be more harmful to one’s health than being outdoors ...

¶Pizza, Please! One of the world’s most popular foods along with the hamburger, fried chicken, and milk shakes is pizza. Although the origin of the first three foods is well understood, that of pizza until recently, anyway was for along time an international controversy. The word pizza has always been known to mean pie or cake, and is an Italian word. This fad alone might suggest pizza’s origins. However, some years ago in New York City, a Chinese restaurateur challenged the Italian et...

¶How Could so Many People Support Hitler In Jerusalem , on April 11th, 1961, Adolf Eichmann stood trial for crimes against humanity. Eichmann had been a Nazi official tasked with organizing the transport of over 1.5 million European Jews to ghettos and concentration camps . He was popularly described as an evil mastermind who orchestrated atrocities from a cushy German office, and many were eager to see the so-called “desk murderer” tried for his crimes. But the squeamish ...

¶The Warrior Who Defeated the Mighty Mughals - Stephanie Honchell Smith In warfare, in command, in sound judgement, and in administration, he had no equal.—— In 1624, Mughal Emperor Jahangir received word of yet another defeat at the hands of his greatest enemy, Malik Ambar. Despite coming to India as an enslaved youth, Ambar had risen to rule over the Indian sultanate of Ahmednagar. His brilliant military tactics had brought the Mughals’ march of conquest to a screeching halt . Jahang...

¶高分子链的结构 ¶近程结构 石墨和纸浆是天然高分子化合物 试讨论线形聚异戊二烯可能有哪些不同的构型,假定不考虑键接结构(画出结构示意图)——聚异戊二烯可能有6种有规立构体解 本题为何没考虑无规立构呢？ 写出有取代的二烯 CH~3~CH=CH-CH=CH-COOCH~3~ 经加聚反应得到的聚合物,若只考虑单体的1,4-加成和单体头-尾相接,则理论上可能有几种立体异构? 为什么不是3X3X2=18种呢？为什么没有考虑无规异构呢？ ==【例1-8】==在聚乙烯醇(PVA)溶液中加人 HIO4,假定1,2-乙二醇结构全都与HIO4,作用使分子链断裂。在加人前测得PVA的数均相对分子质量为35000作用后相对分子质量为2200。试求PVA中头-头相接结构的百分数(即每100个结构单元中头-头结构数)。 #mjx-7631c64{ display:contents; mjx-assistive-mml { user-select: text !important; ...

¶研究背景 ¶金属锂作负极的挑战 锂枝晶生长 固态电解质可抑制锂枝晶生长 过充or快充时、以金属锂作负极时 体积膨胀与电极粉化 ¶固态电池——采用固态电解质的锂离子电池 电化学窗口，5V>4.2V 金属Li作负极可能实现 高锂离子电导率 低电子电导率 正负极优异的化学和电化学稳定性 难表征 柔性不够 不好回收 固态电解质的电化学分解，不可避免 ¶硫化物固态电解质 ¶优势 更高的离子电导率 良好的界面接触 ¶不足 电压窗口较窄 固态电解质在不发生电化学分解的情况下能够稳定工作的电压范围 化学失效——电极/电解质界面兼容性差 锂枝晶失效 机械失效 “在正极引入保护涂层是实现ASSLBs实际应用的最有效方法” 无法大规模制造？超薄电解质膜制备困难，无机电解质的力学性能差 ¶改性 电解质表面涂层来抑制界面反应（如GO） 结构设计：通过增加电解质的密度和优化微观结构来抑制锂枝晶生长。例如，通过两步烧结法制备的Li6PS5Cl电解质具有6.11 mS cm^-1^的高离子传导率和良好的循环稳定性 掺杂来提高电解质的稳定性...

¶Why Does February Only Have 28 Days Although February 2015 might fit perfectly on the page , every year it’s the runt of the monthly litter . This deficit of days, this calendar craziness , this oddity of the annum, like so much of modern culture, is the Romans’ fault. Here’s the crazy story of why February has 28 days… except when it doesn’t. Romulus, the maybe-mythical, maybe-real founder and first king of Rome, had a problem. With an increasing number of festivals, feasts, military c...