Wide power range microwave feedback controller

A substantially constant power level is derived over a predetermined frequency band, in each of a plurality of relatively widely spaced power ranges, from a microwave load having a predetermined amplitude versus frequency response, such as an antenna. A microwave source of substantially constant amplitude drives a forward path connected between the source and the load. A feedback path responsive to the microwave power level in the forward path derives a control voltage for the PIN attenuator. The equalizer attenuator drives a linear, crystal amplitude detector. Attenuating means included in the forward and feedback paths are selectively connected in circuit to maintain the power level of the microwave input to the amplitude detector substantially constant, even though different power ranges are supplied to the load by the forward path

Reaction rate calculation by parallel path swapping

The efficiency of path sampling simulations can be improved considerably using the approach of path swapping. For this purpose, we have devised a new algorithmic procedure based on the transition interface sampling technique. In the same spirit of parallel tempering, paths between different ensembles are swapped, but the role of temperature is here played by the interface position. We have tested the method on the denaturation transition of DNA using the Peyrard-Bishop-Dauxois model. We find that the new algorithm gives a reduction of the computational cost by a factor 20.Comment: 5 pages, 3 figure

"Knowledge-Capital, International Trade and Foreign Direct Investment: A Sectoral Analysis"

The knowledge-capital (KC) model of MNEs is now a widely adopted empirical approach to explaining the location and production decisions of global firms based on both horizontal and vertical motivations. While most of the existing studies have focused on highly aggregated national data, we extend this model to sectoral data consisting of broad manufacturing industries and explicitly account for the dynamic nature of international investment data. The empirical results from a dynamic panel data analysis indicate that that the predictions of the KC model regarding MNE behavior vary by the type of industry. Production processes in electronics and transportation-equipment are more characterized by efficient vertical specialization of R&D activities and assembly, while other sectors display more complex motivations.FDI, knowledge-capital model, exports, GMM

Anonymous mobile device connections

Despite the vast use of social media on mobile devices there is not a good way to make connections without the use of identifying information. The idea is to use sound, light, or images to make connections between individuals or groups without the need to exchange phone numbers, email address, links, tags or any identifying information. This technology can be used even if the individuals or groups are not in direct contact with each other

Letter from E. G. Titus

Letter of recommendation for E. D. Ball

Problem solving and suicide: A first look

Suicide is the 10th leading cause of death in the United States, with rates increasing over the past several decades. This study examined whether problem-solving performance differs in those with no suicide ideation or attempts compared to those with only suicide ideation and with those with a history of attempts. Results demonstrated that when accounting for depression, problem-solving accuracy was positively predictive for the suicidal ideation group. Furthermore, the suicidal ideation group solved more problems on average than both those with no history of suicidal thoughts and behaviors and the suicide attempt group. The current study was somewhat underpowered and therefore should be interpreted with caution. Additionally, this is the first study to use the problem-solving task when investigating suicide and the first to use the task in an online manner. The findings suggest some meaningful differences that will lay the groundwork for future investigations

The crystal and molecular structure of Hydridotetrakis(diethyl phenylphosphonite)cobalt(I)

An X-ray structure determination of the title compound shows that the co-ordination about the cobalt atom is approximately trigonal bipyramidal; n.m.r. data indicate that the complex is non-rigid in solution