基于MEMS的固体推进器阵列

为满足微小型卫星星载推进系统小型化、微推力、高精度的需求,研制了一种基于MEMS技术的固体化学微推进器.该推进器具有低功耗、低点火能量阈值、无可动部件的特点,理论上具有较高的工作可靠性.介绍了推进器的结构设计、工艺流程,以及推进剂加注方法,并给出了已经加工完成的6×6单元阵列原理样机的推力预测和点火性能初步测试结果.样机瞬时点火功率小于1 W, 平均点火电压低于 40 V, 理论推力约1.7 mN. 与同量级推力的电推进器相比,工作电压大大降低.     

基于β-环糊精的金属有机骨架材料的合成研究

采用蒸汽扩散法制备了新型的具有生物相容性的金属有机骨架化合物(Na-β-CD-MOFs),利用X-射线单晶衍射仪对Na-β-CD-MOFs结构进行检测并解析,分析表明该晶体属于单斜晶体,P21空间群,分子式为C₄₂H₇₆O₄₂Na,a=14.713 3(13)×10-10 m,b=15.314 8(13) ×10-10 m,c=15.016 9(13)×10-10 m,β=117.797(3)°,α=γ=90.000°,V=2 993.31(50) ×10-10 m³。然后通过XRD、SEM、FT-IR、TG进行表征,表明Na-β-CD-MOFs中保留了环糊精骨架,具有多孔道三维网状结构。     

MEMS微变形镜单元间耦合的优化控制研究

通过计算MEMS微变形镜校正畸变波面后的残余误差,研究不同单元间耦合情况对变形镜校正效果的影响.针对连续镜面MEMS微变形镜单个致动器单元工作时,相邻及以外的单元都会有一个变形量,用耦合系数来表征单元工作时对相邻单元变形量的影响程度.以单元间距为3mm的10×10单元阵列MEMS微变形镜为例,研究了变形镜校正不同畸变波面时,最佳耦合系数与波面畸变因素对应关系.当校正对象为前20阶Zernike多项式波面,此变形镜的最佳耦合系数为10%.分析了单元间距分别为2,2.5,3,3.5,4mm时,10×10单元阵列MEMS微变形镜校正效果的变化情况;不同单元间距对应的最佳耦合系数分别为12%,11%,10%,9%,8%.     

福建闽南沿海翡翠股贻贝鳃细胞微核率的研究

以翡翠股贻贝(Pernaviridis(linnaeus))鳃组织为实验材料,调查了福建闽南沿海4个不同养殖区(杏林马銮湾、火烧屿、同安湾和东山东沈)的微核率.结果表明,这4个海区的翡翠股贻贝鳃细胞微核率依次为:同安湾>东山东沈>杏林马銮湾>火烧屿.其中,微核率最高的同安湾为2.2×10-3,最低的火烧屿为1.23×10-3.其结果与前人在法国沿岸和威尼斯流域调查的结果1.8×10-3～5.3×10-3相比,微核率较低.说明目前这4个海区水体中所含遗传毒性污染物的量并不太高,但其潜在的危害仍不容忽视.     

4A和13X分子筛去除水中重金属Cd2+及其吸附性能研究

以4A和13X分子筛为吸附材料,考察废水pH值和Cd²⁺初始浓度等对Cd²⁺去除率的影响,并研究了分子筛对Cd²⁺的吸附性能。结果表明,4A和13X分子筛投加量为0.16g/L、废水pH值为5、Cd²⁺浓度为20mg/L时,Cd²⁺去除率达到95%以上;分子筛对Cd²⁺的去除机理以离子交换吸附为主,交换出来的Na⁺与分子筛吸附的Cd²⁺摩尔浓度比为2;在吸附热力学和动力学方面,4A和13X分子筛均符合Langmuir吸附等温模型和Lagergren二级速率方程,计算的饱和吸附容量Q₀分别为150.15、163.67mg/g,二级反应速率常数K₂分别为2.45×10-3、3.96×10-4 g/(mg·s)。该吸附反应是一种单分子层反应速度较快的化学吸附过程。     

新型微机电系统光开关研制

介绍了几种新型微机电系统(MEMS)光开关的设计、制造和性能.研制了一种摆动式微电磁驱动器,用其驱动反射镜切入和切出光路.在此基础上,研制了1×2、2×2、1×4和1×8四种典型的MEMS光开关,达到了较好的性能.这些光开关可广泛应用于光纤通信系统.     

多通道电化学基因传感阵列快速联检AML相关耐药基因的新方法

筛选并制备高特异性 DNA 探针,与纳米粒子标记技术相结合,设计多通道电化学基因传感阵列检测模式,建立灵敏、快速、简便、经济的急性髓系白血病（AML）相关多药耐药基因（MDR1和MRP）检测新方法. 该方法具有较好的特异性、灵敏度和重现性,能够在1.0×10^-14 ~ 1.0×10^-12 mol·L^-1和5.0×10^-14~5.0×10^-12 mol·L^-1范围内,分别实现对AML 相关多药耐药基因序列MDR1和MRP的定量检测. 该方法有望为预测肿瘤治疗效果和临床制定治疗方案提供参考依据.     

氧氟沙星的极谱测定及电化学行为研究

在0.25mol/L KCl(pH=3.60)的底液中,采用线性扫描极谱法测定氧氟沙星,得到一良好的还原峰. 峰电位Ep=-1.40V(vs.SCE),峰电流Ip与氧氟沙星的浓度在2.0×10-7-8.0×10-6mol/l范围内成线性关系,相关系数r=0.9978,检出限为9.0×10-8mol/L.采用本法测定片剂的含量,回收率在98.13%- 100.68%,RSD为1.69 - 2.31%之间,方法简便,结果准确可靠.用多种电化学方法研究了氧氟沙星在汞电极上的电化学行为,结果表明氧氟沙星的电极过程具有吸附性、动力性和不可逆性.     

衡阳市中心城区城市绿地生态系统服务供需匹配研究

以衡阳市中心城区为例,结合城市绿地生态系统服务功能特点,采用生态模型法和价值当量法测算空气净化、气候调节、休闲娱乐和水源涵养4项生态系统服务的供给和需求,并分析其空间匹配关系。结果表明:1)生态系统服务空气净化、气候调节、休闲娱乐和水源涵养供给能力分别为21.75×10⁶元、167.01×10⁸元、50.42×10⁶元和288.83×10⁶元,空间上总体呈现中心低四周高的空间分布特点。2)各生态系统服务需求分别为73.77×10³元、2 076.71×10⁸元、2 532.94×10⁶元和630.27×10⁸元,其空间呈现中心高四周低的空间特征。3)各生态系统服务的供需匹配度从高到低依次是空气净化(0.51)、气候调节(－0.57)、休闲娱乐(－0.66)和水源涵养(－0.68),且具有明显的空间差异性,空气净化匹配度高值区主要分布在城区周边区域,其他三项生态服务高值区则主要分布在研究区的东北部。     

聚离子液体膜修饰电极检测厚朴酚

合成了1-[3-(N一吡咯)丙基]-3-己基咪唑四氟硼酸盐离子液体,以其为单体,采用电位阶跃法制备出聚 离子液体膜修饰玻碳电极,经十二烷基磺酸根阴离子交换,获得聚离子液体膜疏水界面．研究了厚朴酚在该聚离 子液体膜疏水界面上的电化学行为,采用用微分脉冲伏安法实现了厚朴酚的电化学测定．在优化条件下,厚朴酚的 氧化峰峰电流与其浓度在1.0×10^-8～5.0×10^-6 mol/L和5.0×10^-6～2.0×10^-5 mol/L范围内呈良好的线性关 系,检测限为7.1×10^-9 mol/L(S/N=3).该方法成功用于中药厚朴中厚朴酚测定．     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that