| 查看: 310 | 回复: 5 | |||
| 当前主题已经存档。 | |||
aaaa4564木虫 (正式写手)
|
[交流]
请教一句英语的意思
|
||
|
文章需要修改，其中一条意见是The assignment of the data in Table 1 should be improved 请问各位大侠这句话的意思是不是“在表1中的数据分配应改善”，也就是说我表中的数据的顺序要调整一下？？ |
回复此楼» 猜你喜欢
之前让一硕士生水了7个发明专利，现在这7个获批发明专利的维护费可从哪儿支出哈？
已经有5人回复
-
博士读完未来一定会好吗
已经有29人回复
-
博士申请都是内定的吗？
已经有5人回复
-
到新单位后，换了新的研究方向，没有团队，持续积累2区以上论文，能申请到面上吗
已经有12人回复
-
投稿精细化工
已经有4人回复
-
高职单位投计算机相关的北核或SCI四区期刊推荐，求支招！
已经有4人回复
-
导师想让我从独立一作变成了共一第一
已经有9人回复
-
读博
已经有4人回复
-
JMPT 期刊投稿流程
已经有4人回复
-
心脉受损
已经有5人回复
xiaoqihu
铁杆木虫 (著名写手)
- 翻译EPI: 88
- 应助: 1 (幼儿园)
- 贵宾: 0.005
- 金币: 9724.8
- 散金: 7
- 红花: 4
- 帖子: 1337
- 在线: 105.6小时
- 虫号: 590066
- 注册: 2008-08-31
- 专业: 有机合成
2楼2010-03-05 10:46:14
aaaa4564
木虫 (正式写手)
- 应助: 0 (幼儿园)
- 金币: 2026.8
- 散金: 10
- 帖子: 969
- 在线: 37小时
- 虫号: 254033
- 注册: 2006-05-21
- 性别: GG
- 专业: 通信理论与系统
|
Table 1. Effect of the alkalies on the condensation of chalcone with malononitrilea Entry Alkali Reaction time (h) Yield(%)b 1 — 6 40 2 NaOH 6 23 3 KOH 6 28 4 Na2CO3 6 67 5 K2CO3 2 95 6 50c 6 NaHCO3 6 70 aMmol ration of chalcone/malononitrile/I2/alkali is 1.0/1.0/0.1/0.1. The reaction was accomplished in MeOH at room temperature; bIsolated yields; cWithout iodine. 下面是对应的分析 First, the condensation of chalcone with malononitrile using molecular iodine as catalyst was examined with several inorganic alkalies catalysts and the results are summarized in Table 1. As shown in Table 1, K2CO3 was more satisfied to obtain excellent yield in short time (entry 5) than other inorganic alkalies. Low yield was obtained and long reaction time was needed using NaOH and KOH as catalysts (entries 2 and 3), this owing to the NaOH and KOH were too strong bases to result in more by-products.[8f] Na2CO3 and NaHCO3 had moderate yields under the same reaction conditions (entries 4 and 6), and they both needed a longer reaction time than K2CO3. However, a long reaction time was needed and low yield was obtained without any base (entry 1) or molecular iodine (entry 5). 我觉得是顺序的问题,可能是我段中没有按1234的顺序分析。。望大家指教 [ Last edited by aaaa4564 on 2010-3-5 at 11:03 ] |
3楼2010-03-05 10:58:42
xiaoqihu
铁杆木虫 (著名写手)
- 翻译EPI: 88
- 应助: 1 (幼儿园)
- 贵宾: 0.005
- 金币: 9724.8
- 散金: 7
- 红花: 4
- 帖子: 1337
- 在线: 105.6小时
- 虫号: 590066
- 注册: 2008-08-31
- 专业: 有机合成
4楼2010-03-05 11:11:23
zzczxl
木虫 (小有名气)
- 应助: 1 (幼儿园)
- 金币: 1609.5
- 帖子: 95
- 在线: 24.5小时
- 虫号: 805388
- 注册: 2009-07-08
- 性别: GG
- 专业: 作物种质资源与遗传育种学
5楼2010-03-05 16:36:07
6楼2010-03-08 08:46:45