非催化气固反应动力学热分析方法与仪器

准确测量近本征反应速率和计算反应动力学参数是热化学工程和应用化学工程领域的重要研究问题.以热重为代表的传统热分析方法与仪器在非催化气固反应的测试与分析中得到了广泛应用,形成了许多典型的非等温反应分析方法与模型方程.本研究概述了现有热分析的方法原理及在气固反应分析中存在的缺陷,剖析了自主研发的利用微型流化床反应器强化反应...     

对甲基苯甲醛的Grignard试剂合成法

二甲基苯并咪唑盐;对甲基苯甲醛的Grignard试剂合成法     

等离子体粒子模拟中的一种碰撞模型

在等离子体粒子模拟程序中 ,采用一种三维 β粒子云 (这里 β是粒子云的电量和质量相对于真实粒子相应量的比率 )来补偿有限大小粒子削减的碰撞效应 .用冲量近似 (直线轨道近似 )方法导出 β粒子云的半径a和 β值与散射截面之间的关系 ,并可确定为了使模拟系统的碰撞效应与真实系统的相当而应选取的a和 β值 ,还可通过调整a和β值来人为地加强或减弱碰撞效应 ,粒子模拟结果与理论分析相一致     

Topcolor Assisted Technicolor Models and Single Top Quark Production via at the Tevatron

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Boundary Effects for One-Dimensional Bariev Model with Hard-Core Repulsion

For the Bariey model for correlated hopping in one dimension under open boundary conditions, the Bethe ansatz equations are analyzed for both a repulsive and an attractive interaction in several limiting cases, i.e., the ground state, the weak and strong coupling limits. The contributions of the boundary fields to both the magnetic susceptibility and the specific heat are obtained.     

PTCR纳米晶粉体的烧结成瓷工艺研究

采用Sol-gel制得了PTCR纳米晶粉体,借助热分析技术研究了烧结过程中的热行为,并以此热分析数据为依据,拟定了烧结工艺.在此工艺条件下获得的PTCR陶瓷材料的电性能比前文有较大幅度提高,其室温电阻率(ρ室)约为20Ω·cm,电阻-温度系数(αr)达20%/℃,耐电压强度(Vb)大于160V/mm.     

Top-Higgs htO and the Process γγ→ ZZ

In the context of topcolor-assisted technicolor (TC2) models, we calculate the s-channel contributions ofthe top-Higgs htO to the process γγ→ ZZ. We find that, for reasonable ranges of the parameters, htO can give significantcontributions to this process. When the top-Higgs mass approximately equals to the center-of-mass energy √s and thefree parameter e = 0.01, the cross section can reach 161 fb, which may be detected in the γγ collisions based on thefuture e+e- colliders. Thus, the process γγ→ ZZ may be used to probe the top-Higgs and further test TC2 models inγγ collisions.     

基于压电双晶片的测量薄膜应变的膨胀仪

研制了一种基于压电双晶片的高灵敏度膨胀仪,它能够在较宽的频率范围内(1～103Hz),可靠、方便地测量自由状态下又薄又软的共聚物薄膜厚度方向的电场致应变．测试结果证明这种新型的膨胀仪在频率为100Hz时能探测低至0．1 nm的位移．最后测量了一种共聚物薄膜的电场致应变．     

芦苇杆炭负载N掺杂TiO2的制备及光催化活性研究

以钛酸丁酯、乙酰丙酮、盐酸为原料,通过溶胶凝胶法合成芦苇杆炭(经酸处理)负载N掺杂TiO2,利用X射线衍射(XRD)、扫描电子显微镜(SEM)、激光粒度仪等技术对样品的形貌和结构进行分析表征,以亚甲基蓝作为底物,氙灯光照下的光催化降解实验评测其光催化活性.实验证明,当N/Ti=1at;,退火温度350℃时,退火3h后的芦苇杆炭负载TiO2 1N对亚甲基蓝光降解性能可达92;,同时,该复合光催化剂对苯酚、对氯甲苯及硝基苯都具有一定的光催化效果.     

用于痕量监测Zr4+、Cr2O72-、Fe3+、HPO42-和指纹识别的功能化Eu3+/Tb3+配位聚合物荧光探针的构筑

采用芳香族π共轭及含氮原子有机连接剂,合成同构铽、铕发光配位聚合物(CPs){[Eu (PLIA)_1.5(H₂O)₂]·H₂O}_n (1)和{[Tb (PLIA)_1.5(H₂O)₂]·H₂O}_n (2),其中H₂PLIA=5-((吡啶-4-基甲基)氧基)苯-1,3-二甲酸。对合成的配合物进行了结构测定、表征和荧光痕量识别实验研究。2个同构配合物具有理想的三维框架结构,π…π堆积及氢键等弱相互作用增强了其化学稳定性;表征显示配位聚合物1和2具有良好的荧光性质、结晶性、热力学稳定性及结构完整性,可作为荧光传感的材料。1和2对水溶液中的Zr⁴⁺、Cr₂O₇^2-和Fe³⁺、HPO₄^2-具有选择性好、灵敏度高的荧光识别能力,其检出限分别为0.139 μmol·L^-1(1,Zr⁴⁺)、0.626 μmol·L^-1(1,Cr₂O₇^2-)、0.430 μmol·L^-1(2,Fe³⁺)、1.36 μmol·L^-1(2,HPO₄^2-)。探究了1和2作为探针的荧光猝灭机理。更有趣的是,1和2具有指纹识别性能,其荧光指纹纹路清晰连贯,细节明显,可被清晰观察。