【标题】Spectroscopic observation of the forward and backward IR emission of bacteriorhodopsin under broadband optical pumping
【参考中译】宽带光泵浦下细菌视紫红质前向和后向红外发射的光谱观察
【类型】 期刊
【关键词】 Bacteriorhodopsin; Stimulated infrared emission; FT-IR spectroscopy; Optical excitation; Multi-frequency light; Vibrational dynamics experiments
【参考中译】 细菌视紫红质；受激红外发射；FT-IR光谱；光激发；多频光；振动动力学实验
【作者】 E L Terpugov; O V Degtyareva; V V Savranskii
【摘要】 For the first time, it was demonstrated that the secondary IR emission stimulated by visible light propagates not only in the direction opposite to the exciting beam, but also in the forward direction. Furthermore, by a control of the forward-directed beam arrival back at the sample time-picosecond resolution was achieved. Using the forward-directed beam as a probe beam, we were able to obtain additional information about the properties of the bacteriorhodopsin in the excited state. The performed studies open the possibility for analyzing the molecular excitation, vibrational coupling, and relaxation processes directly during electronic excitation in picoseconds time scales.
【参考中译】 首次证明了可见光激发的二次红外发射不仅沿与激发光相反的方向传播，而且还沿正向传播。此外，通过控制前向光束在样品时间返回，实现了皮秒分辨率。使用正向光束作为探测光束，我们能够获得有关细菌视紫红质在激发态的性质的额外信息。所进行的研究为在皮秒时间尺度上直接分析电子激发过程中的分子激发、振动耦合和驰豫过程提供了可能。
【来源】 Laser Physics Letters 2022, vol.19, no.10
【入库时间】 2023/4/27
【标题】Fluid-structure coupling analysis of a pressure vessel-pipe-safety valve system with experimental and numerical methods
【参考中译】压力容器-管道-安全阀系统流固耦合的实验和数值分析
【关键词】 Pressure vessel-pipe-safety valve; Fluid-structure coupling; Dynamic instability; CFD
【参考中译】 压力容器-管道-安全阀；流固耦合；动力不稳定性；CFD
【作者】 Chaoyong Zong; Qingye Li; Fengjie Zheng; Dianjing Chen; Xiaofeng Li; Xueguan Song
【摘要】 Pressure vessel-pipe-safety valve (PVPSV) is a commonly used combination in the industrial pressure systems. For the design optimization purpose, an in-depth investigation on the working mechanism of such a combination is essential. To this end, experimental and numerical analysis were performed in this paper. For measuring, an experimental test rig is specially designed and built, thereby dynamic tests were performed. The results indicate that the set-pressure of the safety valve and the valve spring stiffness have significant influence on the dynamics of the PVPSV. Upon certain operating conditions, the safety valve responds in unstable manners, e.g., flutter or chatter. To compensate the tests, a high-fidelity 2-D axis-symmetric system-level Computational Fluid Dynamics (CFD) model is used. The simulation results show that both the damping coefficient and the connecting pipe length have great influence on the dynamics of the PVPSV system. A PVPSV system with a small damping coefficient and/or a long connecting pipe is more likely to exhibit dynamic instability. Finally, combining the results of experiments and numerical simulations, a large enough net disc force coupled with insufficient kinetic energy loss of valve moving parts are considered to be the root cause of unstable operations of the PVPSV system.
【参考中译】 压力容器-管道-安全阀(PVPSV)是工业压力系统中常用的组合。为了达到设计优化的目的，对这种组合的工作机理进行深入的研究是非常必要的。为此，本文进行了实验和数值分析。为了测量，专门设计和建造了实验试验台，从而进行了动态测试。结果表明，安全阀的设定压力和阀门的弹簧刚度对PVPSV的动态特性有显著的影响。在某些运行条件下，安全阀以不稳定的方式响应，例如颤动或颤动。为了补偿这些测试，使用了高保真的二维轴对称系统级计算流体动力学(CFD)模型。仿真结果表明，阻尼系数和连接管长度对PVPSV系统的动态特性都有很大影响。具有较小阻尼系数和/或较长连接管道的PVPSV系统更容易表现出动态不稳定性。最后，结合实验和数值模拟的结果，认为足够大的盘净作用力和阀门运动部件动能损失不足是PVPSV系统不稳定运行的根本原因。
【来源】 International Journal of Pressure Vessels and Piping 2022, vol.199
【标题】M18 FUEL DUAL BATTERY BLOWER DELIVERS MORE POWER WITH LESS NOISE
【参考中译】M18双电池燃料鼓风机提供更高的功率和更低的噪音
【作者】 Dave McMahon
【摘要】 IN RECENT YEARS, significant efforts have been made to implement noise and emission regulations for landscaping equipment across the United States to curb air pollution. As an alternative, fully compliant with these emerging regulations, professional landscapers have started to transition to battery-operated equipment. Even in non-regulated areas, pros are shifting to battery-powered products as they offer quieter, hassle-free solutions revolutionizing the jobsite.
【参考中译】 近年来，美国各地都做出了重大努力，对园林绿化设备实施了噪音和排放法规，以遏制空气污染。作为一种完全符合这些新兴法规的替代方案，专业园艺师已经开始过渡到电池供电的设备。即使在不受监管的领域，专业人士也在转向电池供电的产品，因为它们提供了更安静、更无麻烦的解决方案，彻底改变了工作场所。
【来源】 Outdoor Power Equipment Business: OPE Business 2022, vol.65, no.6
【标题】Danfoss buys compressor specialist Bock
【参考中译】丹佛斯收购压缩机专业公司Bock
【作者】 Andrew Gaved
【摘要】 BUSINESS: Component giant Danfoss is to widen its portfolio with the purchase of German compressor manufacturer Bock. The company, founded in 1932, claims one of the world's largest portfolios of semi-hermetic compressors for natural refrigerants and developed its first CO_2 unit back in 1993. Danfoss said it "is investing significantly in broadening its scope of sustainable, clean technologies to speed up the green transition in commercial refrigeration systems".
【参考中译】 商业：零部件巨头丹佛斯将通过收购德国压缩机制造商Bock来扩大其投资组合。丹佛斯成立于1932年，号称是世界上最大的自然制冷剂半密闭压缩机产品组合之一，并在1993年开发了第一台二氧化碳机组。丹佛斯表示，它“正在大力投资，扩大其可持续、清洁技术的范围，以加快商业制冷系统的绿色转型”。
【来源】 H&V News 2022, no.Nov.
【标题】Solar and batteries for cooler classrooms
【参考中译】用于较凉爽教室的太阳能和电池
【作者】 Nicola Card
【摘要】 Air conditioning systems are continuing to be installed at hundreds of public schools across NSW, however this can be a costly exercise. The units can draw down a lot of energy during hot spells and this adds up to high energy costs, but the extra strain on the grid can also create extra costs to upgrade the electricity network. "If the school is located in a grid constrained area, that can potentially require us to fund costly upgrades to the local electricity network," NSW Cooler Classrooms Program Director Nick Fisher said.
【参考中译】 新南威尔士州的数百所公立学校继续安装空调系统，但这可能是一项代价高昂的工作。在炎热的天气里，这些机组会消耗大量的能量，这就增加了高昂的能源成本，但电网上的额外压力也会增加升级电网的额外成本。新南威尔士州凉爽教室项目主任尼克·费舍尔说：“如果学校位于电网受限的地区，这可能需要我们为当地电网的昂贵升级提供资金。”
【来源】 Smart Energy 2022, vol.42
【标题】MOTOR AND GEARBOX COMBINES IN E-BIKE
【参考中译】电动自行车中的电机和变速箱组合
【作者】 John G. Falcioni
【摘要】 The German automotive manufacturing company Continental has developed new electric bike drive systems that combine the motor and gearing into one efficient unit. Continental, in collaboration with German bicycle maker Cycle Union, will launch an e-bike line powered by the pioneering drive systems later this year. Cycle Union has been pursuing a long-term goal of integrating batteries into the frames of all its future e-bike models. The company has invested heavily in a product line in which the central element of each frame consists of a single molding manufactured via gravity casting. One of the new models, the Revolution, runs on a motor with a fully integrated stepless automatic transmission. Along with advantages in maintenance and servicing, the all-in-one drive unit makes for easier maneuvering because it is mounted in a single unit at the bottom bracket axle position, lowering and centering the bike's center of gravity.
【参考中译】 德国汽车制造公司大陆开发了新的电动自行车驱动系统，将电机和传动装置结合在一起，成为一个高效的单元。大陆将与德国自行车制造商自行车联盟合作，在今年晚些时候推出一款由开创性驱动系统提供动力的电动自行车生产线。自行车联盟一直在追求一个长期目标，即将电池集成到其未来所有电动自行车车型的车架中。该公司在一条生产线上投入了大量资金，在该生产线上，每个车架的中心部件都由通过重力铸造制造的单一模具组成。其中一款新车型革命采用的是完全集成的无级自动变速器电机。除了在维护和维修方面的优势外，一体式驱动单元还使操作更容易，因为它安装在单个单元的底部支架轴位置，降低并对中自行车的重心。
【来源】 Mechanical Engineering 2018, vol.140, no.1