Improving the State Selectivity of Field Ionization With Quantum Control

The electron signals from the field ionization of two closely spaced Rydberg states of rubidium-85 are separated using quantum control. In selective field ionization, the state distribution of a collection of Rydberg atoms is measured by ionizing the atoms with a ramped electric field. Generally, atoms in higher energy states ionize at lower fields, so ionized electrons which are detected earlier in time can be correlated with higher energy Rydberg states. However, the resolution of this technique is limited by the Stark effect. As the electric field is increased, the electron encounters numerous avoided Stark level crossings which split the amplitude among many states, thus broadening the time-resolved ionization signal. Previously, a genetic algorithm has been used to control the signal shape of a single Rydberg state. The present work extends this technique to separate the signals from the 34s and 33p states of rubidium-85, which are overlapped when using a simple field ramp as in selective field ionization

Improving the state selectivity of field ionization with quantum control

The electron signals from the field ionization of two closely-spaced Rydberg states of \mbox{rubidium-85} are separated using quantum control. In selective field ionization, the state distribution of a collection of Rydberg atoms is measured by ionizing the atoms with a ramped electric field. Generally, atoms in higher energy states ionize at lower fields, so ionized electrons which are detected earlier in time can be correlated with higher energy Rydberg states. However, the resolution of this technique is limited by the Stark effect. As the electric field is increased, the electron encounters numerous avoided Stark level crossings which split the amplitude among many states, thus broadening the time-resolved ionization signal. Previously, a genetic algorithm has been used to control the signal shape of a single Rydberg state. The present work extends this technique to separate the signals from the $34s$ and $33p$ states of rubidium-85, which are overlapped when using a simple field ramp as in selective field ionization

Perturbed Field Ionization for Improved State Selectivity

Selective field ionization (SFI) is used to determine the state or distribution of states to which a Rydberg atom is excited. By evolving a small perturbation to the ramped electric field using a genetic algorithm, the shape of the time-resolved ionization signal can be controlled. This allows for the separation of signals from pairs of states that would be indistinguishable with unperturbed SFI. Measurements and calculations are presented that demonstrate this technique and shed light on how the perturbation directs the pathway of the electron to ionization. Pseudocode for the genetic algorithm is provided. Using the improved resolution afforded by this technique, quantitative measurements of the 36p3/2 + 36p3/2 --\u3e 36s1/2 + 37s1/2 dipole–dipole interaction are made

Drivers of Coral Reconstructed Salinity in the South China Sea and Maritime Continent: The Influence of the 1976 Indo-Pacific Climate Shift

The flow of Pacific water into the Indian Ocean via the South China Sea (SCS) and Maritime Continent (MC) plays an important role in the ocean thermohaline circulation providing the only low-latitude pathway for the inter-ocean exchange of heat and salt. The transport of the SCS and Indonesian throughflows is modulated by the East Asian monsoon and major climate modes associated with the Pacific and Indian Oceans. As an indicator of surface layer buoyancy, sea surface salinity (SSS) is critical to rates of exchange but instrumental records of SSS are short and sparse. Using empirical orthogonal functions, a synthesis of proxy-based reconstructions of SSS from coral δ18O is used to study the role of climate variability on long-term SSS behavior in the region. The leading mode of SSS variability in the boreal winter and summer responds to the influence of the 1976 Indo-Pacific climate shift. At multi-decadal timescales, only the East Asian monsoon and the Indian Ocean Dipole (IOD) retain their signal in winter and summer SSS after 1976. At higher frequencies, winter SSS shifts from having a strong East Asian monsoon signal to a more dominant impact of the IOD and the El Niño Southern Oscillation (ENSO) following the shift. In the summer, only a change in ENSO's influence on SSS variability is observed after 1976. The recent intensification and dominance of the IOD and ENSO in driving SSS variability in the SCS and MC may influence circulation in the regional throughflows and perhaps global thermohaline circulation

Acquired Factor VIII Inhibitor Presenting as Occult GI Bleeding

An acquired coagulation factor deficiency is characterized by acquired autoantibodies against specific clotting factors in those without diagnosed hemophilia. It is a relatively rare condition with an incidence of approximately one case per million per year. We present a case report of an elderly male who initially presented with an occult GI bleed that was identified with a positive fecal occult blood test result. This is the first case reported to our knowledge of an acquired factor inhibitor deficiency presenting in this manner. We postulate the importance of acquired factor inhibitors in the setting of unexplained anemia given absence of overt clinical symptoms that could contribute to aggravate an established GI bleed, especially in the elderly population

Gynecologic Oncology fellowship recruitment in the virtual era: An evaluation of program websites and survey of applicant preferences

Objective: Virtual Gynecologic Oncology fellowship recruitment has altered how candidates and programs exchange information. This study analyzes programs’ web-based content and the priorities of fellowship candidates. Methods: Web-based materials of Gynecologic Oncology fellowship programs participating in the 2022 match were reviewed. An anonymous survey was emailed to applicants. Questions assessed importance of web-based materials on a Likert scale. Respondents were asked to rank factors from most to least important in their decisions to interview and rank programs. Results: Of the 66 programs participating in the 2022 Gynecologic Oncology fellowship match, 62 (93.9%) had accessible websites. Over one-fourth (25.8%) of program websites did not list application requirements. Most (74.2%) websites contained requests for letters of recommendation, but fewer (48.4%) specified the preferred quantity or authorship. Residency in-service exam score requirement information was present on 61.3% of websites. Of 100 applicants invited to participate, 44 returned surveys (44% response rate). The median number of programs applied to was 60 (IQR 51–65). Web-based materials most important to candidates were application requirements and deadlines, letter of recommendation details, and in-service exam requirements. Interaction with faculty and program information received during interview days were among the most important factors in decisions to rank programs. Conclusions: Gynecologic Oncology fellowship applicants surveyed in this study applied to nearly all participating fellowships. The content of web-based materials varies across program websites, particularly for application requirements, which applicants indicated as the most important electronically available material. Programs should have clear application requirements and provide clinical details on their websites

sj-docx-1-cpj-10.1177_00099228231200405 – Supplemental material for Association Between Child Sugary Drink Consumption and Serum Lipid Levels in Electronic Health Records

Supplemental material, sj-docx-1-cpj-10.1177_00099228231200405 for Association Between Child Sugary Drink Consumption and Serum Lipid Levels in Electronic Health Records by Ankitha Iyer, Fang-Chi Hsu, Alex Bonnecaze, Joseph A. Skelton, Deepak Palakshappa and Kristina H. Lewis in Clinical Pediatrics</p

Advances in 3D Printing for Electrochemical Energy Storage Systems

In the current scenario, energy generation is relied on the portable gadgets with more efficiency paving a way for new versatile and smart techniques for device fabrication. 3D printing is one of the most adaptable fabrication techniques based on designed architecture. The fabrication of 3D printed energy storage devices minimizes the manual labor enhancing the perfection of fabrication and reducing the risk of hazards. The perfection in fabrication technique enhances the performance of the device. The idea has been built upon by industry as well as academic research to print a variety of battery components such as cathode, anode, separator, etc. The main attraction of 3D printing is its cost-efficiency. There are tremendous savings in not having to manufacture battery cells separately and then assemble them into modules. This review highlights recent and important advances made in 3D printing of energy storage devices. The present review explains the common 3D printing techniques that have been used for the printing of electrode materials, separators, battery casings, etc. Also highlights the challenges present in the technique during the energy storage device fabrication in order to overcome the same to develop the process of 3D printing of the batteries to have comparable performance to, or even better performance than, conventional batteries