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【Discussion】anyone could tell me the reasons
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深圳市人民医院活性天然产物研究方向诚招联合培养硕士生2-3
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+1/81
天津大学化学系吴立朋课题组申请考核制博士招生/博后招聘
+1/80
天津大学化学系吴立朋课题组申请考核制博士招生/博后招聘
+1/79
【CSC招生】荷兰莱顿大学医学中心LKEB图像处理实验室 招收2026年CSC博士生多名
+1/38
江西师范大学化学与材料学院2026年博士研究生招生
+1/30
中国中化 下设二级全资公司 中国化工橡胶有限公司 2025-2026年度校招秋招补录开始啦~
+1/28
山东大学集成电路学院招收2026年9月入学的博士研究生
+1/13
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+1/3
实验室研究员
+1/3
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5楼2011-02-25 14:06:04
6楼2011-02-25 14:10:16
★ ★ ★
poyoro(金币+5): :tuzi3::tuzi3::tuzi3: 2011-02-25 14:30:55
xia_chong(金币+3): I peifu you! :D 2011-02-25 18:01:05
poyoro(金币+5): :tuzi3::tuzi3::tuzi3: 2011-02-25 14:30:55
xia_chong(金币+3): I peifu you! :D 2011-02-25 18:01:05
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植物中含有纤维素、木素和色素。在造纸过程中,将植物茎杆(如稻草)经过碱煮,木素和色素溶于碱液中,被水洗除去,但是难得除干净,纸浆里面仍含有少量的木素和色素。这些木素和色素在 阳光和空气的作用下,逐渐发生了变化,使得纸变 ; 黄变脆。 Plants contain cellulose, lignin and pigment. In the papermaking process, the plant stems (such as straw) after alkaline cooking, and pigments dissolved in alkali lignin, was washed to remove, but a rare addition to clean, which still contains a small amount of pulp lignin and pigment. The lignin and pigment under the action of sunlight and air, and gradually changed, making paper, variable; yellow brittle. ![]() ![]() |
7楼2011-02-25 14:21:20
8楼2011-02-25 14:29:49
poyoro(金币+5): It seems to make sense 2011-02-25 15:00:31
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It's rare and commendable that you could conserve so many cards for so long a time! I dumped them immediately after their missions. May be I should learn from you, they are really memorable! I suggest you to keep them away from air and light in a container with powerful vaccum effect |
10楼2011-02-25 14:47:20
11楼2011-02-25 14:53:42
poyoro(金币+2): OK tks 2011-02-25 15:01:34
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本帖内容被屏蔽 |
12楼2011-02-25 14:55:45
poyoro(金币+2): :tuzi13: 2011-02-25 17:15:58
lppv: only english here.welcome all the same, next time, english o . 2011-02-25 17:29:16
lppv: only english here.welcome all the same, next time, english o . 2011-02-25 17:29:16
| 塑料的自然老化 |
14楼2011-02-25 15:57:11
poyoro(金币+5): tomorrow i will go to school. ...hope you can come Emuch as often as you can . :tuzi12: 2011-02-25 17:18:10
lppv: how to say 塑料老化 in english? you could try it. 2011-02-25 17:30:28
lppv: how to say 塑料老化 in english? you could try it. 2011-02-25 17:30:28
塑料老化,是塑料的特性之一。http://bbs.ourplas.cn/read.php?tid=17949 |
15楼2011-02-25 16:17:20
19楼2011-02-25 17:30:16
20楼2011-02-25 18:01:48
22楼2011-02-25 18:35:57
23楼2011-02-25 18:49:35
25楼2011-02-25 19:18:46
26楼2011-02-25 19:20:06
27楼2011-02-25 19:33:09
28楼2011-02-25 19:33:50
29楼2011-02-25 19:36:53
30楼2011-02-25 19:41:35
31楼2011-02-25 19:43:27
32楼2011-02-25 19:43:53
33楼2011-02-25 19:45:05
34楼2011-02-25 20:00:49
35楼2011-02-25 20:07:45
38楼2011-02-26 16:22:06
39楼2011-02-26 18:59:45
poyoro(金币+5): OK 2011-02-26 23:06:50
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The reason why the cards fade is that the chemical which was used in the cards to improve the whiteness had been changed or reacted due to the long-term contact with air. Sunlight will obviously accelerate this progress. The same thing would happen to books, white wall, white clothes etc. [ Last edited by wangyeliu on 2011-2-26 at 20:50 ] |
40楼2011-02-26 20:49:13
poyoro(金币+1): no way :cool: 2011-02-28 11:31:27
poyoro(金币+4): 2011-03-23 00:05:13
poyoro(金币+4): 2011-03-23 00:05:13
| This time I do not want to talk about the color change. I am concered about the gold coins you left. I think, if you do not distribute them to us, I am afraid that the left gold coins (BBs) may also change their colors in you hands. So i suggest you give it to me more if you like. |
41楼2011-02-28 05:52:12
42楼2011-02-28 14:36:52
43楼2011-02-28 16:59:01
45楼2011-03-01 21:12:53
| Your post has been covered by other newly presented posts. And 35 gold conins are still left. So I decide at once to help you to place it on the top of all posts. This is the aim of writing this response. I am sure I do not want to get extra coins this time. I am just as a volunteer and do not ask for money. |
46楼2011-03-02 04:39:35
47楼2011-03-02 08:30:10
48楼2011-03-02 09:45:24
50楼2011-03-02 12:41:23
简单回复
2011-02-25 14:00
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小木虫(沙发+1,金币+0.5):恭喜抢个沙发,再给个红包
poyoro(金币+1): :tiger19: 2011-02-25 17:19:20
poyoro(金币+1): :tiger19: 2011-02-25 17:19:20
nono20093楼
2011-02-25 14:01
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小木虫(金币+0.2):抢了个小板凳,给个红包
poyoro(金币+1): :tiger19: 2011-02-25 17:19:27
poyoro(金币+1): :tiger19: 2011-02-25 17:19:27
2011-02-25 14:01
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poyoro(金币+1): :tiger19: 2011-02-25 17:19:32

飞的猪9楼
2011-02-25 14:44
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poyoro(金币+1): :tiger19: 2011-02-25 17:21:03
dhd99713楼
2011-02-25 15:40
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poyoro(金币+1): :rol::rol::rol: 2011-02-25 17:21:26
liufawen16楼
2011-02-25 16:19
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poyoro(金币+1): :rol::rol::rol: 2011-02-25 17:21:33
erics08017楼
2011-02-25 16:21
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poyoro(金币+1): :rol::rol::rol::rol::rol::rol: 2011-02-25 17:21:38
lovewalle18楼
2011-02-25 16:34
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poyoro(金币+1): :rol::rol::rol::rol::rol::rol::rol::rol::rol: 2011-02-25 17:21:43
javy02321楼
2011-02-25 18:30
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poyoro(金币+1): OK 2011-02-25 18:48:38

[ Last edited by javy023 on 2011-2-25 at 19:33 ]
witch_girl24楼
2011-02-25 19:02
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87909935936楼
2011-02-25 22:20
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chenbin陈斌37楼
2011-02-26 00:05
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200512723944楼
2011-02-28 17:06
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日月教主49楼
2011-03-02 11:40
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It‘s Oxidized~
