3(5)-[(4-苄氧基)苯基]-5(3)-(2-呋喃基)-1H-吡唑的合成及结构确证

β-二酮和水合肼反应合成了标题化合物,采用元素分析、IR、1HNMR和ESI-MS对其结构进行了鉴定和分析.由于这种1H-吡唑化合物能形成N-H...N分子间的氢键,因而在ESI-MS图上出现很强的二聚体离子峰[2M]+.     

果浆酶和果胶酶对猕猴桃出汁率的影响

为制取猕猴桃汁,通过单因素和正交试验,以出汁率、VC保存率和果汁色泽香气变化为指标,用果浆酶和果胶酶对猕猴桃进行酶解处理,探索更适合的猕猴桃制汁工艺条件。结果表明：两种酶都能大幅提高猕猴桃的出汁率,果胶酶酶解条件较剧烈,虽出汁率较高,但对VC含量和果汁色泽香气影响较大;果浆酶酶解条件较温和,总体指标较好,最佳酶解条件为酶解温度30℃、果浆酶加酶量10000U/kg、酶解时间2h、出汁率0.853mL/g,VC保存率67%。果浆酶更适合猕猴桃果汁的制取。     

氟代β-二酮化合物的合成及结构表征

芳香酮和三氟乙酸乙酯在强碱CH3ONa作用下发生经典Claisen缩合反应,合成了两种未见文献报道的含氟β-二酮:4,4,4-三氟-1-(6-甲氧基-2-萘基)-1,3-二酮和4,4,4-三氟-1-(4-苄氧基苯基)-1,3-二酮。两种氟代β-二酮在氯仿溶液中几乎完全以烯醇式存在,其结构通过红外光谱、核磁氢谱、质谱和元素分析进行了确证。     

Simulations of Stimulated Raman Scattering in Low-Density Plasmas

Stimulated Raman particle-in-cell （PIC） simulations scattering （SRS） in a low-density The backward stimulated Raman plasma slab is investigated by scattering （B-SRS） dominates initially and erodes the head of the pump wave, while the forward stimulated Raman scattering （F-SRS） subsequently develops and is located at the rear part of the slab. Two-stage electron acceleration may be more efficient due to the coexistence of these two instabilities. The B-SRS plasma wave with low phase velocities can accelerate the background electrons which may be further boosted to higher energies by the F-SRS plasma wave with high phase velocities. The simulations show that the peaks of the main components in both the frequency and wave number spectra occur at the positions estimated from the phase-matching conditions.     

Spatiotemporal Evolution of Stimulated Raman Scattering in the Absolute and Convective Regimes

A three-wave interaction (3WI) code is developed to study the stimulated Raman scattering (SRS) in both absolute and convective regimes. In the simulations, the time and spatial evolutions of a plasma wave are described by temporal growth rate and spatial factor, respectively. The spatial factors in different phases and different instability regimes are investigated. It is found that the spatial factor is caused by the finite velocity of the pump wave in the first phase and by damping in the last phase. With inclusion of the spatial factor, the temporal growth rate decreases and the threshold for SRS for a finite frequency mismatch increases. Meanwhile, the effects of wave frequency mismatch on the temporal growth rate are also discussed.     

固化物透明的双组份丙烯酸酯胶粘剂的研制

研究了不同丙烯腈含量的丁腈橡胶(NBR)对双组份丙烯酸酯胶粘剂进行改性,结果表明随着丙烯腈含量提高,固化物透明度增加。     

轮式足球机器人平滑运动轨迹控制算法的研究--Robocup系列研究之四

介绍一种轮式足球机器人的平滑运动轨迹控制算法。为了更简洁有效地驱动足球机器人平滑快速地跟踪目标位置与姿态，在控制其移动的过程中应平滑连续地改变其速度和方向。提供了一种基于双积分系统时间最优Bang-Bang控制的轨迹生成及控制算法，在模拟引导轨迹的引导下进行连续的速度控制引导机器人平滑高速跟踪运动轨迹并按要求调整其末端姿态。通过一系列的仿真结果来体现该控制算法的高效性和准确性。     

注浆堵水技术在盲斜井施工中的实践

通过福建省鑫阳矿业有限公司盲斜井施工工程的防治水实践,阐述了盲斜井工作面注浆堵水工程的选择与应用。施工实践表明,经过注浆处理的破碎带高承压水地段,涌水量已由300 m3/h降至5 m3/h。     

竖井井壁淋水的治理实践

由于建在地下裂隙水发育处的竖井井壁淋水严重。影响其正常生产，采用钻孔排水和集水槽接排水及防护栏，网的综合治理措施后，基本上解决这一问题。     

激光成丝不稳定性并行数值模拟研究

实现了三维非线性流体力学与激光传播耦合的并行数值模拟程序,用来研究高强度激光在稀疏等离子体中的激光成丝不稳定性.并行数值实验结果表明,该程序在64台处理机上取得了较好的并行加速比,且能定性模拟激光成丝现象.