卷染机模糊控制系统设计

采用模糊逻辑控制器设计控制规律,提出了对具有明显耦合作用的二输入/二输出系统的一种模糊控制器设计方案,即"在线规则自调整"和"主从交替"策略.在模糊控制系统中采用了变频调速器作为执行元件控制张力和线速.以卷染机为控制对象,用8098和两台变频调速器实现了整个模糊控制系统,样机运行的测试结果表明,该模糊控制系统设计是成功的.     

氢型丝光沸石催化剂催化α-蒎烯合成α-松油醇

在相转移助剂苄基三乙基氯化铵(BTEAC)存在下,以氢型丝光沸石(HM)为催化剂,原料α-蒎烯经开环、重排及水合反应一步法合成了α-松油醇。研究了各种因素对α-蒎烯转化率及α-松油醇收率的影响,采用5因素4水平L16(45)进行了正交实验,得出最佳的工艺条件:反应温度80℃,w(BTEAC)=15%,m(HM)∶m(α-蒎烯)=0.6,反应时间40h,m(乙酸乙酯)∶m(α-蒎烯)=0.9。在此条件下,α-蒎烯转化率为75.2%,α-松油醇收率为42.0%。用气相色谱-质谱联用仪对反应产物进行分析,共鉴定出14种化合物,主要成分为α-松油醇、α-蒎烯、柠檬烯、桉叶油素、异松油烯、龙脑等。实验得到的α-松油醇具有光学活性,旋光值[α]=+61°,同时香气纯正,可用于制作香料。     

摆线转子式齿轮泵的设计

提出摆线转子泵流量、转速、转子的齿数和宽度、内外转子的齿隙和端面间隙等确定原则，分析了内、外转子间的相互关系。     

双沟道实空间电子转移晶体管的设计、研制和特性测量

采用双沟道结构和GaAs衬底,成功设计研制了双沟道实空间电子转移晶体管.它具有RSTT典型的"A"形负阻I-V特性和较宽的平坦谷值区.通过栅压可改变各种负阻参数值,当栅压从0.6V增至1.0V时,PVCR的变化范围是2.1～10.6峰值电流跨导约为3×10-4 S.负阻参数VP,VV和开始产生负阻的栅极阈值电压都小于国际上同类器件的报道值,因此更适合低功耗的运用.     

杀螟硫磷生产废水的试验研究

研究了微波辐射条件下,以活性炭为催化剂,过氧化氢为氧化剂氧化处理杀螟硫磷生产废水。考察了微波功率、辐照时间、pH值、活性炭用量、过氧化氢用量对COD去除率的影响,在pH值为2.0、微波功率400W、微波辐照时间5 min、过氧化氢用量0.59 mol/L、活性炭用量120 g/L的条件下,废水COD去除率可达到65.9%,并对反应机理进行了初步探讨。     

储氧材料Ce0.6Zr0.4-xPrxO2-δ的性能及在三效催化剂中的应用

采用溶胶-凝胶法制备了系列三效催化剂储氧材料Ce0.6Zr0.4-xPrxO2-δ（x=0．05，0．10，0．15）。X射线衍射证实形成的固溶体为萤石型立方相结构；BET比表面积分析表明，随着Pr的掺杂量由x=0．05递增到工=0．15，在650℃焙烧的样品其比表面积由66．5增加到79.9m^2／g，而未掺杂样品Ce0．6Zr0.4O2的比表面积为65．1m^2，g；粒度分布及透射电镜分析发现，制备的固溶体在水相中存在着团聚现象。应用在含有Pt，Rh和Pd的三效催化剂的制备。催化活性测试表明，在铈锆氧化物储氧材料中掺杂少量Pr，可降低三效催化剂对CO、C3H6和NO的起燃温度。不论是在富燃区还是在贫燃区，所有掺杂Pr的三效催化剂对各气体的催化转化率均高于未掺杂Pr的三效催化剂。     

Broadband deep-red-to-near-infrared emission from Mn2+ in strong crystal-field of nitride MgAlSiN3

Broadband near-infrared (NIR) phosphors have received increasing attention for fabricating phosphor-converted light-emitting diodes (pc-LEDs) as NIR light source. Most of the reported broadband NIR phosphors originate from Cr³⁺ in weak crystal field environments. Herein, we report a luminescent material, MgAlSiN₃:Mn²⁺ with CaAlSiN₃-type structure, demonstrating that broadband deep-red-to-NIR emission can be achieved via doping Mn²⁺ into crystallographic sites with strong crystal field in inorganic solids. This phosphor is synthesized via easy-handle solid-state reaction, and the optimized sample, (Mg_0.93Mn_0.07) AlSiN₃ shows an emission band with peak at ~754 nm, FWHM of 150 nm, and internal quantum efficiency of 70.1%. The photoluminescence intensity can further be enhanced by co-doping Eu²⁺ as sensitizer. This work provides a new strategy for discovering new broadband NIR phosphors using Mn²⁺ in strong crystal field as luminescence center.     

降低摩托车发动机排气排放的试验研究

在ＱＭ５０ＱＷ型摩托车用二冲程发动机上,通过在化油器后加装进气旋流器、活塞裙部打排气回流孔、消声器中装催化转化器以及排气口和扫气通道引入空气等措施的采用,使发动机排气排放和燃油经济性得到不同程度地改善。另外,还对不同怠速转速、不同怠速空气螺钉位置及不同气缸盖温度对排气排放的影响进行了探讨。     

MAC-layer rate control for 802.11 networks: a survey

Rate control at the MAC-layer is one of the fundamental building blocks in many wireless networks. Over the past two decades, around thirty mechanisms have been proposed in the literature. Among them, there are mechanisms that make rate selection decisions based on sophisticated measurements of wireless link quality, and others that are based on straight-forward heuristics. Minstrel, for example, is an elegant mechanism that has been adopted by hundreds of millions of computers, yet, not much was known about its performance until recently. The purpose of this paper is to provide a comprehensive survey and analysis of the existing solutions from the two fundamental aspects of rate control—metrics and algorithms. We also review how these solutions were evaluated and compared against each other. Based on our detailed studies and observations, we share important insights on future development of rate control mechanisms at the MAC-layer. This discussion also takes into account the recent developments in wireless technologies and emerging applications, such as Internet-of-Things, and shows issues that need to be addressed in the design of new rate control mechanisms suitable for these technologies and applications.