Based on characteristics and connectivity of the groups in molecules,a new method was developed to calculate the molar refractions of cycloalkanes from molecular structure.

根據(jù)分子結(jié)構(gòu)的特點(diǎn)，發(fā)展了一種計(jì)算環(huán)烷烴摩爾折射度的新方法。對(duì) 2 3 2種環(huán)烷烴的計(jì)算結(jié)果表明这里视频亚洲视频免费观看,，摩爾折射度計(jì)算值十分接近實(shí)驗(yàn)值，平均誤差 0 2 8%黑硬大长欧美在线视频，計(jì)算精度顯著優(yōu)于文獻(xiàn)方

An improved chemical method for the determination of the molar substitution degree of hydroxyethyl guar gum has been described.

本文用模型小分子一縮二乙二醇的醚鍵斷裂實(shí)驗(yàn)證明了可行性免费黄色xxxx视频，羥乙基瓜爾膠上的羥乙基鏈段與過(guò)量對(duì)甲苯磺酸-乙酸酐在130℃下反應(yīng)14hr，醚鍵完全斷裂生成酯这里只有精品99久久精品国产，并在pH=11條件下煮沸1hr使酯完全水解免费直接看黄，轉(zhuǎn)變?yōu)橐叶肌?/p>

The effects of molar ratio of anhydrous ethanol to glacial acetic acid, dosage of catalyst, reaction temperature and reaction time on the esterification ratio and reuse of catalyst were discussed.

探討了酸醇物質(zhì)的量的比，催化劑的用量深夜在线视频在线深夜，反應(yīng)時(shí)間和反應(yīng)溫度對(duì)酯化率的影響及催化劑的重復(fù)使用情況男女搞黄视频。

These complexes showed modest catalytic activity, and the PDIs of the polymers obtained were relatively broad.6. Reaction of CpjLn with MBMPHa in THF in 1 :1 molar ratio, isopropanol was added to the system in 1 equiv., after workup, a new kind of neutral lanthanide complexes [LnCw-OiPrXTHF2]2 Ln = La (14, Nd (15),Yb (16) were gained.

配合物cp3Ln與MBMPH：按卜1的摩爾比在THF中反應(yīng)1小時(shí)，然后再原位按卜1的摩爾比加入異丙醇超碰人妻97精品，合成了中性的橋聯(lián)雙芳氧基稀土烷氧基配合物 [L城獷0日本欧美国产激情，P以THF2]2Ln=La(14，Nd(15)三A黄色网站，Yb(16)，產(chǎn)物經(jīng)紅外光譜国产高清色色，元素分析和核磁共振氫譜(配合物14)等表征免费看的黄色视频。

The ratio of Al13/Alb is much less than 1.0 when B and Al/Si molar ratio are in low value in PASC, which means that corresponding rela tion between Alb does not exist.

本文對(duì)Al-Ferron逐時(shí)絡(luò)合比色法和27Al-NMR法對(duì)PASC和PAC中鋁的形態(tài)分布的測(cè)定結(jié)果進(jìn)行了對(duì)比分析和討論。

HereⅠuse published literature data on the late Palaeolithic of Lake Baikal and Altai Mountains region in Russia to map environmental changes through molar crown height, diet and body size in large h.

利用已發(fā)表的俄羅斯貝加爾湖和阿爾泰山區(qū)域舊石器時(shí)代晚期的文獻(xiàn)資料j国产在线，通過(guò)對(duì)大型食草動(dòng)物臼齒齒冠高度九九久精品、食性和體型大小的分析，繪制了環(huán)境變化圖国产又大好爽免费视频。

The liquefied Japanese cedar was blended with PMDI (poly-4, 4'-diphenylmethane diisocyanate), and adding water as a blowing agent, organosiloxane as a surfactant and dibutyl tin dilaurate as a catalyst to prepare the polyurethane foams. The effects of the kind and dosage of surfactant and the molar ratio of NCO/ for PMDI to liquefied Japanese cedar on the properties of PU foams were investigated.

Doncao96； Japanese cedar進(jìn)行液化處理，所得液化柳杉進(jìn)一步與異氰酸酯PMDI混合鲁鲁鲁网站，并添加水為發(fā)泡劑欧美日韩精品一二三区，有機(jī)矽氧烷為界面活性劑，二月桂酸二丁錫為催化劑制造聚胺基甲酸酯發(fā)泡體最新地址福利影院，探討界面活性劑種類欧洲一级高潮喷水A片、添加量及PMDI與液化柳杉之NCO/莫耳比對(duì)所制造PU發(fā)泡體性質(zhì)之影響。

In this study, Cryptomeria japonica was liquefied in phenol with H2SO4 and HCl as a catalyst. The epoxy resin was synthesized from epichlorohydrin and bisphenol A with the molar ratio of 5/1. Blending resins were prepared by mixing the liquefied Japanese cedar and epoxy resin with weight ratios of 30/100, 50/100 and 70/100, and the triethylene tetramine was added as a cross-linking hardener. The effect of mixing ratios of liquefied Japanese cedar to epoxy resin and amount of hardener added on the reactivity of blending resins and the properties of cured resins were investigated. Furthermore, polysiloxane and rice husk were added as foaming agent and filler, respectively, to the epoxy resin and blending resins. The foaming process, the bubbles shape, the mechanical properties, and the thermal stability of the epoxy foams were investigated.

中文摘要本研究將柳杉(Cryptomeria japonica国产又粗又大又硬又爽免费视频； Japanese cedar)木材以酚為溶劑麻豆精品无码国产在线，H2SO4及HCl為催化劑進(jìn)行液化處理我要看久久精品黄色片，另以莫耳比5/1之環(huán)氧氯丙烷與雙酚A反應(yīng)合成環(huán)氧樹(shù)脂，并將液化柳杉與環(huán)氧樹(shù)脂以重量比30/100日韩无码肏逼、50/100及70/100混合制備摻合樹(shù)脂亚洲一区二区三区激情在线观看，并以三乙基四胺(Triethylene tetramine； TETA)為架橋硬化劑好大好硬好深好爽舒服，探討液化柳杉與環(huán)氧樹(shù)脂混合比及硬化劑添加量對(duì)其摻合樹(shù)脂之反應(yīng)性鲁吧鲁吧鲁吧，及其硬化樹(shù)脂性質(zhì)之影響；進(jìn)一步於環(huán)氧樹(shù)脂與摻合樹(shù)脂中添加聚矽氧烷為發(fā)泡劑国产国语对白Av在线，稻殼粉為填料制備發(fā)泡體97在线欧美超碰，探討其發(fā)泡體之發(fā)泡過(guò)程、泡體形態(tài)久久久久久a亚洲欧洲AⅤ、發(fā)泡體機(jī)械性質(zhì)與熱穩(wěn)定性三级片A片一级片。