CRYSTALLINE CARBON NITRIDE THIN FILMS DEPOSITED BY MICROWAVE PLASMA CHEMICAL VAPOR DEPOSITION

The crystalline carbon nitride thin films have been prepared on Si (100) substrates using microwave plasma chemical vapor deposition technique. The experimental X-ray diffraction pattern of the films prepared contain all the strong peaks of α-C₃N₄ and β-C₃N₄, but most of the peaks are overlapped.The films are composed of α-C₃N₄ and β-C₃N₄. The N/C atomic ratio is close to the stoichiometric value 1.33. X-ray photoelectron spectroscopic analysis indicated that the binding energies of C 1s and N 1s are 286.43eV and 399.08 eV respectively. The shifts are attributed to the polarization of C-N bond. Both observed Raman and Fourier transform infrared spectra were compared with the theoretical calculations. The results support the existence of C-N covalent bond in α- and β-C₃N₄ mixture.     

光电管耦合FitzHugh-Nagumo神经元的同步

感光细胞能接收各种强度的可见光,并转换为生物电信号连接视神经;这样的功能可以用光电效应来模拟.本文利用数值计算,分析了基于光电管耦合FitzHugh-Nagumo(FHN)神经元的动力学特性,详细讨论了光电管的参数空间中,混沌和簇放电模式下耦合系统的同步区间.结果表明:在耦合强度较小时,耦合系统由于受迫共振表现为完全同...     

Alkylation of Chitosan as Nerve Conduit Biomaterial

IntroductionTrauma of the nervous system,which is one of themostimportant systems in the human body,oftenresults in permanent loss of function and greatdiscomfort for the patients.Study of peripheralnerve regeneration has not only relieved patientpain,but also provided insight into themechanisms of nerve development andregeneration. So both clinical medicine andfoundational life science benefit from the study ofperipheral nerve regeneration.　There has been a resurgence of interest in thedevel…     

微波等离子体化学气相沉积法制备C3N4薄膜的结构研究

采用微波等离子体化学气相沉积法,用高纯氮气(99.999%)和甲烷(99.9%)作反应气体,在单晶Si(100)基片上沉积C₃N₄薄膜.利用扫描电子显微镜观察薄膜形貌,表明薄膜由密排的六棱晶棒组成.X射线衍射和透射电子显微镜结构分析说明该薄膜主要由β-C₃N₄和α-C₃N₄组成,并且这些结果与α-C₃N₄相符合较好.由虎克定律近似关 关键词： 3N₄')" href="#">C₃N₄ 微波等离子体化学气相沉积法 薄膜沉积     

多目标指派问题及其在物流供应中的应用

将多目标指派问题与模糊数学思想相结合,把各目标下的属性值矩阵转化为模糊关系矩阵,再将模糊关系合成矩阵与解决传统指派问题的匈牙利方法结合起来,提出了一种新的求解方法：模糊匈牙利法,并结合物流供应说明了该方法的应用。     

服务性学习在高职英语教学中的应用

服务性学习是一种将课程与社区服务结合起来的教育方式。在高职英语教学中适当运用服务性学习，可以弥补教学中存在的一些不足，提高高职院校学生的英语应用能力和社会责任感。     

EST analysis of Prorocentrum donghaiense with emphasis on genes involved in PCD

Prorocentrum donghaiense has caused large-scale red tides off the Chinese coast in recent years.Ex-pressed sequence tag(EST)analysis was carried out for this dinoflageilate in order to identify the func-tional genes involved in its biological processes.A cDNA library was constructed for P.donghaiense atexponential growth phase,and 565 usable sequencing reads were obtained from 700 clones selected ran-domly.Messenger RNA corresponding reads were clustered into 36 contigs and 272 singletons(ESTgroups).Twe...     

生命科学中的物理问题讲座第五讲穆斯堡尔效应及其在生物医学中的应用

简要介绍了穆斯堡尔效应及穆斯堡尔谱仪的基本原理,对其在生物医学领域中的应用及进展,包括生物大分子的结构与功能,疾病的诊断与治疗效果的评价,无副作用的治疗癌症的新方法以及在环境保护,植物,微生物等方面的研究进行了讨论。     

Non-isothermal Kinetics of the Dehydration Process of Na_2MoO_4·2H_2O

Introduction In the field of thermal analysis kinetics, there have been many kinetic models and methods of processing the corresponding data, which can depict the most probable kinetic mechanism of solid state reactions, such as the method combining differential and integral methods,1-6 the method combining isothermal and non-isothermal processes7,8 and method of TA curve shape,9,10 and so on. Recently, based on the predeces-sor抯 work, a more complete kinetic method of process-ing thermal ana…     

重视社区老年人隐匿性贫血提高老年人整体生活质量

由于老年人特有的生理特点,隐匿性贫血发生率相对较高,当出现心慌、气短、乏力、下肢浮肿时,有的老人滥用心血管药物,症状得不到根本的改善,有的老人虽就治于社区基层医院,但部分医生因缺乏对老年人隐匿性贫血的足