近炸引信炮口保险距离的计算

该文以国外某舰炮弹药无线电近炸引信为例,分析研究了该无线电近炸引信炮口安全保险距离有关的参量,通过对火药燃烧时间和电路延迟时间的计算推出了几种不同情况下该无线电近炸引信炮口保险距离,分析计算方法具有普遍性。     

利用二苯并—18—冠—6从硫氰酸盐溶液中萃取铜（Ⅱ）的研究

报道了在二苯并－１８－冠－６（ＤＢＣ）的１,２－二氯乙烷溶液中,从硫氰酸盐溶液萃取铜时,冠醚浓度,硫氰酸盐浓度和氢离子浓度对萃取的影响,结果表明,当硫氰酸钾浓度大大超过铜浓度和氢离子浓度（０．１ｍｏｌ／Ｌ）时,ＤＢＣ可有效地萃取铜,作者从实验结果推断其萃合物的组成为Ｃｕ（ＳＣＮ）＾－３Ｋ＾＋（ＤＢＣ）２（ｏ）。     

浅谈增钙粉煤灰在抹灰工程中的应用

本文结合工程实际,讨论了用粉煤灰作抹灰砂浆的掺合料在建筑工程中的应用情况,分析了它的应用条件、优点、使田中应予注意的一系列有关问题及其发展前景。     

椭圆变分不等式的小扰动

研究Ｂａｎａｃｈ空间中椭圆变分不等式的扰动问题，得到了扰动问题存在唯一解的一个充分条件；并用它处理了一类半线性微分积分方程的边值问题．设Ｖ是可分自反Ｂａｎａｃｈ空间，Ｖ′是Ｖ的对偶空间，Ｋ是Ｖ中非空闭凸子集，则有定理１设Ｔ：Ｖ→Ｖ′，Ａ：Ｋ→Ｖ′，且满足（ｉ）Ｔ是有界线性算子，存在常数α＞０，使得（Ｔｖ，ｖ）≥αｖ２，ｖ∈Ｖ；（ｉ）Ａ是伪单调算子，存在常数λ＞０，使得（Ａｕ－Ａｖ，ｕ－ｖ）≤λｕ－ｖ２，ｕ，ｖ∈Ｋ；（ｉｉ）α＞λ．则存在唯一的ｕ∈Ｋ，使得（Ｔｕ，ｖ－ｕ）＋（Ａｕ，ｖ－ｕ）≥（ｆ，ｖ－ｕ），ｕ∈Ｋ     

Mutations in SWI/SNF chromatin remodeling complex gene ARID1B cause Coffin-Siris syndrome

We identified de novo truncating mutations in ARID1B in three individuals with Coffin-Siris syndrome (CSS) by exome sequencing. Array-based copy-number variation (CNV) analysis in 2,000 individuals with intellectual disability revealed deletions encompassing ARID1B in 3 subjects with phenotypes partially overlapping that of CSS. Taken together with published data, these results indicate that haploinsufficiency of the ARID1B gene, which encodes an epigenetic modifier of chromatin structure, is an important cause of CSS and is potentially a common cause of intellectual disability and speech impairment.     

Horses damp the spring in their step.

The muscular work of galloping in horses is halved by storing and returning elastic strain energy in spring-like muscle-tendon units.These make the legs act like a child's pogo stick that is tuned to stretch and recoil at 2.5 strides per second. This mechanism is optimized by unique musculoskeletal adaptations: the digital flexor muscles have extremely short fibres and significant passive properties, whereas the tendons are very long and span several joints. Length change occurs by a stretching of the spring-like digital flexor tendons rather than through energetically expensive length changes in the muscle. Despite being apparently redundant for such a mechanism, the muscle fibres in the digital flexors are well developed. Here we show that the mechanical arrangement of the elastic leg permits it to vibrate at a higher frequency of 30-40 Hz that could cause fatigue damage to tendon and bone. Furthermore, we show that the digital flexor muscles have minimal ability to contribute to or regulate significantly the 2.5-Hz cycle of movement, but are ideally arranged to damp these high-frequency oscillations in the limb.     

非晶态Ni-P合金的组织结构转变

本文采用化学镀方法制备非晶态Ni-P合金,研究了非晶态Ni—P合金的组织结构转变过程。结果表明,非晶态Ni-P合金的磷含量影响其晶化转变,磷含量小于11.0％,晶化相为f.c.c Ni,大于11.0％的则为Ni_3P,其过程类似过冷液体的结晶过程。     

江苏省前三岛鸟类调查报告

前三岛由达念山岛、平山岛和车牛山岛三小岛组成，位于黄海，东经１１９°４９′１８″一１１９°５４′３０″、北纬３４°５９′４２″一３５°０８′２４″．岛上植被简单．据调查，前三岛鸟类１２９种，隶１５目３７科，其中非雀形目鸟类５１种，雀形目鸟类７８种，占总数的３９．５３％和６０．４７％．７３种为《中日候鸟保护协定》规定保护的鸟类．按动物地理区划，３１种属东洋界鸟类，８７种为古北界种类，广布１１种．按季节分．旅鸟５３种、冬候鸟２４种、夏候鸟３１种、留鸟２０种、迷鸟１种．有国家一级保护鸟１种，二级保护鸟１５种．黄蹼洋海燕是中国第一次发现的新记录．文中提出了有关保护鸟类的措施．     

相转移卡宾法合成2_甲基_2_戊烯酸

本文采用相转移卡宾法合成2-甲基-2-戊烯酸,收率为42.5‰,产品的香息较好,结果较佳.