A New Cytotoxic Acetogenin from the Seeds of Annona squamosa

A New Annonaceous acetogenin,squamostolide(1),was isolated from the seeds of Annona squamosa.Its structure was elucidated based on spectroscopic methods and comparison with known compounds.It is the first example of Annonaceous acetogenin with each of the two ends of the aliphatic chain bearing a γ-lactone.Thenew compound exhibited cytotoxic activity in vitro against bel-7402 and CNE2 human tumor cell lines.     

Microwave-assisted Regioselective 1-O-Deacylation of Peracylated Glycopyranoses on Alumina

A facile, rapid and regioselective method for the 1-O-deacylation of peracylated glycopyranoses is described which occurs under mild conditions by absorption onto alumina using microwave irradiation.     

An Improved Synthesis of Retinoic Acid from β-Ionone

A convenient and large-scale preparation of retinoic acid 1 from β-ionone in five steps with 38% overall yield is described.The key steps are the epoxidization of 2 with a new methylated agent and the condensation 4 with tetraethyl methylenediphophonate in one-pot procedure to prepare 6.     

ICP-AES同时测定混合矿物素中的磷、钙、铁、铜、锌、锰、镁、钴

采用ICP－AES法测定混合矿物素中的磷、钙、铁、铜、锌、锰、镁、钴元素含量，并对样品的溶解酸和酸用量、元素分析线的选择以及共存元素间的干扰进行了研究。该法简便、快速，精密度和准确度较好。     

白炽灯延寿节电开关

运用交流电路中线圈的自感特性，制成一种白炽灯的延寿节电开关，它可消除白炽灯起动瞬间的浪涌电流，延长白炽灯寿命，节约用电。     

系综分布和它的小涨落近似

由“从正则分布出发，在小涨落近似下得出的能量涨落分布公式”求得的能量涨落的二次矩与直接由正则分布求得的二次矩完全相同，但分别由二求得的高次矩并不完全相同。     

单件小批生产系统下模糊优化的动态随机投入产出模型

本文针对单件小批量生产系统 ,建立了模糊优化的动态随机投入产出模型 ,同时给出了该模型的递推解法 ,并用此模型对某单件小批企业在生产计划期的商品量进行了规划     

Microstructure Evolution in Laser RS Co-base Metastable Alloy

ＭｉｃｒｏｓｔｒｕｃｔｕｒｅＥｖｏｌｕｔｉｏｎｉｎＬａｓｅｒＲＳＣｏ－ｂａｓｅＭｅｔａｓｔａｂｌｅＡｌｌｏｙＷＡＮＧＡｎａｎ；ＣＨＥＮＧＳｈｕｎｑｉ；ＧＵＯＺｈｉｙａｏ（ＫｕｎｍｉｎｇＵｎｉｖｅｒｓｉｔｙｏｆＳｃｉｅｎｃｅａｎｄＴｅｃｈｎｏｌｏｇｙ，...     

真值维护系统的语义研究

本文研究了带有CP(Conditional Proof)验证式 TMS(Truth Maintenance System)理论的形式语义,证明了TMS理论J转换为新理论J*后,原指称的有效性;讨论了U. Junker和Kurt Konolige所定义的不带CP验证式 TMS理论的扩充在我们的语义模型中的有效性。此外,本文还讨论了CP验证式的一些性质,结论是:CP验证式和非单调可证明性、逻辑真有着密切的关系。