OFDM-CDMA技术在大型公共建筑节能监控平台中的应用

采用了基于正交频分复用技术的电力线通信(PLC)调制解调器MAX2990构成的自动抄表系统(AMR),可实现大型公共建筑的水、电、气、空调等能耗数据的自动抄送;通过码分多址模组CM800A实现数据的远程传输,本系统能实时监测现场环境变量(温湿度,风速,水流量)并实现相应控制;实验数据表明,本系统具有较强的抗干扰能力、较高的带宽利用率和较快的响应速度。     

Grafting of sulfamethoxazole on acrylic acid−vinyl methyl ketone copolymer using the schiff base reaction−application as a drug delivery system

A series of poly(acrylic acid-co-methylvinylketone–graft–sulfamethoxazole)(AVMDS) species was synthesized for drug carrier applications. The synthesis involved two steps: copolymerization of acrylic acid(AA) with methyl vinyl ketone(MVK) through the free radical route and subsequent grafting of the sulfamethoxazole (SMX) onto the copolymer via the Schiff base reaction of the primary amine of SMX with the carbonyl groups of the MVK units. The structures and properties of the materials were characterized by nuclear magnetic resonance(NMR), X-ray diffraction(XRD), differential scanning calorimetry(DSC), and scanning electronic microscopy (SEM). An in-vitro cytotoxicity test of the drug-carrier systems via MTT assay revealed no significant cytotoxic effect at concentrations up to 100?µg?·?ml^?1. The dynamic release of SMX from these systems through a retro-imidation reaction (inverse Schiff base reaction) was investigated in depth, where the diffusion through the polymer matrix, the enhancement of the water solubility of SMX, the influence of the initial drug concentration, the pH of the medium, and the effect of the degree of swelling of the polymer matrix on the release dynamics were evaluated. The AVMGS4 and AVMGS1 drug carrier systems containing 3.58 and 1.18?wt% of SMX were the best performing systems.     

含Ba变质合金在摩托汽缸头上的应用

用含Ｂａ变质合金取代传统的４元钠盐变质剂,对比研究了Ｂａ和Ｎａ变质对ＺＬ１０７合金摩托汽缸头组织和性能的影响;结果表明,Ｎａ盐在０．５ｈ内有良好的变质效果,但随着时间延长,其变质作用迅速衰退;Ｂａ元素在５～６ｈ内有良好的变质效果,长效作用明显;与Ｎａ盐变质比较,Ｂａ变质铸态和热处理（Ｔ６）后的力学性能的所提高;Ｂａ变质操作简单、无污染、成本低于或接近于Ｎａ盐变质。     

Bacterial Cellulose Membranes Used as Artificial Substitutes for Dural Defection in Rabbits

To improve the efficacy and safety of dural repair in neurosurgical procedures, a new dural material derived from bacterial cellulose (BC) was evaluated in a rabbit model with dural defects. We prepared artificial dura mater using bacterial cellulose which was incubated and fermented from Acetobacter xylinum. The dural defects of the rabbit model were repaired with BC membranes. All surgeries were performed under sodium pentobarbital anesthesia, and all efforts were made to minimize suffering. All animals were humanely euthanized by intravenous injection of phenobarbitone, at each time point, after the operation. Then, the histocompatibility and inflammatory effects of BC were examined by histological examination, real-time fluorescent quantitative polymerase chain reaction (PCR) and Western Blot. BC membranes evenly covered the surface of brain without adhesion. There were seldom inflammatory cells surrounding the membrane during the early postoperative period. The expression of inflammatory cytokines IL-1β, IL-6 and TNF-α as well as iNOS and COX-2 were lower in the BC group compared to the control group at 7, 14 and 21 days after implantation. BC can repair dural defects in rabbit and has a decreased inflammatory response compared to traditional materials. However, the long-term effects need to be validated in larger animals.     

发展循环经济提高企业效益

通过实施可行性技术改造,提高水循环利用率,从而取得可观的经济和社会效益,实现水资源的可持续、实质性的发展.     

基于氧化石墨烯功能材料提高PEDOT:PSS电极性研究

基于聚(3,4-乙烯二氧噻吩)-聚苯乙烯磺酸(PE DOT:PSS)/氧化石墨烯(GO)混合溶液,利用旋涂法制 备了高电导率透明阳极,并采用硫酸(H₂SO₄)浸渍处理的方式,使其导电特性进一步 增强。采用最佳方式 处理的PEDOT:PSS/GO混合薄膜在厚度为40 nm时,其方阻为80 Ω/□,在550 nm时的透过率达到87.7％。 基于表面形貌的AFM图,吸收光谱和拉曼光谱,在少量氧化石墨烯掺杂和硫酸处理后,PSS －和PEDOT⁺链 相分离,使得PEDOT:PSS的结构发生了变化,提高了混合薄膜的电导率。与ITO和纯PEDOT: PSS分 别作为阳极的OLED器件相比,采用优化的PEDOT:PSS/GO混合薄膜作为阳极时的OLED器件具有 最低 的启亮电压和最高的电流效率,其最大亮度是纯PEDOT:PSS作为阳极的OLED的1.7倍。较高 的透过率, 电导率和HOMO能级,尤其是表面形貌的改变都有利于PEDOT:PSS/GO阳极OLED器件性能的改善 。     

室内单立管排水系统若干问题的探讨

肯定了单立管排水系统的优越性及其广泛发展前途。通过流态分析和计算，指出了影响管道内压力波动的关键问题。对系统中关键配件的结构形式提出了改进意见和设想。指出在高层建筑中推广采用塑料管材的必要性。     

湿法脱硫OMC工艺的探讨

简要叙述了湿法脱硫OMC工艺在重油裂解气过程中的工艺参数的确定,同时比较了相对于改良A．D．A．工艺的优劣分析。     

壳聚糖/聚乳酸/聚羟基丁酸酯人工硬脑膜的制备与性能研究

以壳聚糖、聚乳酸、聚(R)-3-羟基丁酸甲酯等为主要成膜物质,用流延法制得新型薄膜材料。研究表明,当壳聚糖∶明胶∶聚乳酸为1∶1∶1时,得到膜的抗拉强度比其他的可生物降解膜都大,达到27.346MPa;当壳聚糖∶明胶∶聚(R)-3-羟基丁酸甲酯为1∶1∶1时,其抗拉强度达到24.363Mpa,防漏性能达到80h。经模拟体内降解研究,在人工脑脊液的环境中浸置44d后,降解率分别为20%左右,降解速度较慢,可以保持其结构6～7周,有利于引导组织再生材料的基本要求。因此该复合膜有望成为医用可生物降解人工硬脑膜。     

复杂松软煤层中风压钻进工艺技术

针对在祁南煤矿松软煤层中施工顺煤层瓦斯抽放钻孔较难的现状,采用ZDY-3200L型钻机等配套设备进行了中风压钻进工艺技术试验,并配套使用了自制的孔口除尘、瓦斯、集渣一体化装置,采用上述措施后,施工钻孔的平均孔深达到了127.9m,瓦斯抽放体积分数达到了30%～40%,并有效解决了钻进中的粉尘问题。