Modeling the effects of p-modulation doping in InAs quantum dot devices

a modeling routine has been developed to quantify the effects of p-modulation doping in the waveguide core region of InAs quantum dot (QD) devices. Utilizing one dimensional approximations, simulated outputs of reverse and forward devices are simulated providing insight into absorption and gain properties

Confined Disposal Facility Improved Weir Designs

One of the initial constraints of any dredging project is deciding where to place dredged material. When placed upland, materials can be used beneficially, as beach nourishment or for habitat restoration, or can be placed in an upland confined disposal facility (CDF). Several times the solids volume in water is required to fluidized and hydraulically pump the materials. Once in the CDF, materials settle out of suspension, with clarified water decanted. This paper describes in general a current weir design used by the U.S. Army Corps of Engineers (USACE) and illustrates the innovations of the new Jacksonville District standard weir. The new outfall structure is safer, easier to construct, and has inherent environmental protection features. It also has a longer life cycle and lower lifecycle cost than traditional structures. This paper also discusses a new composite weir system that is in the patent and construction phase. These new corrosion-resistant systems have the capability of revolutionizing and standardizing water control structures due to basic changes in material selection and operational controls. The construction, management, and maintenance of weir systems are a significant cost incurred by USACE navigation projects; improved systems are available that can reduce maintenance costs while improving the safety of personnel who operate them

QCSE and carrier blocking in P-modulation doped InAs/InGaAs quantum dots

The quantum confined Stark effect in InAs/InGaAs QDs using an undoped and p-modulation doped active region was investigated. Doping potentially offers more than a 3x increase in figure of merit modulator performance up to 100°C

Tele-Psychiatry Assessment of Post-traumatic Stress Symptoms in 100 Patients With Bipolar Disorder During the COVID-19 Pandemic Social-Distancing Measures in Italy

The acute phase of the COrona VIrus Disease-19 (COVID-19) emergency determined relevant stressful burdens in psychiatric patients, particularly those with chronic mental disorders such as bipolar disorder (BD), not only for the threat of being infected but also for the strict lock-down and social-distancing measures adopted, the economic uncertainty, and the limited possibilities to access psychiatric services. In this regard, telepsychiatry services represented a new important instrument that clinicians could adopt to monitor and support their patients. The aim of the present study was to investigate acute post-traumatic stress symptoms (PTSS) reported by patients with BD followed in the framework of a telepsychiatry service, set up in the acute phase of the COVID-19 outbreak at the psychiatric clinic of the University of Pisa (Italy). A sample of 100 patients were consecutively enrolled and assessed by the IES-r, GAD-7, HAM-D, and YMRS. Patients reported a mean (±SD) IES-r total score of 18.15 ± 13.67. Further, 17% of the sample reported PTSS (IES-r > 32), 17% depressive symptoms (HAM-D > 17), and 26% anxiety symptoms (GAD-7 > 10). Work and financial difficulties related to the COVID-19 pandemic and anxiety symptoms appeared to be positively associated with the development of acute PTSS. Acute manic symptoms appeared to be protective. The data of the present study suggest the relevance of monitoring patients with BD exposed to the burden related to the COVID-19 outbreak for prompt assessment and treatment of PTSS

Co-doped 1.3μm InAs Quantum Dot Lasers with high gain and low threshold current

The mechanism by which co-doping reduces threshold current in O-band Quantum dot lasers is examined, with n-type direct doping of the dots reducing threshold current and p-type modulation doping improving the temperature dependence of threshold current density, relative to undoped samples

1.3-μm InAs Quantum Dot Lasers with P-type modulation and direct N-type co-doping

O-band quantum dot lasers with co-doping reduce threshold current density relative to the undoped case, for 1mm long uncoated lasers from 245Acm-2 to 132Acm-2 at 27°C and 731Acm-2 to 312Acm-2 at 97°C. Improvements are also significant compared to lasers employing any one doping strategy

Si-based 1.3 μm InAs/GaAs QD Lasers

The effects of implementing Ge and Si buffer layers on the performance of Si-based InAs/GaAs quantum dot lasers have been investigated in this paper. The laser performance has been improved significantly by utilising group-IV buffer layers

An Interdisciplinary Perspective on Education Service Systems

Part 3: Finance and Service ScienceInternational audienceThe increased complexity in education systems has given rise to a number of intersecting trends and calling for a discipline to integrate across academic silos. As the concept of service innovation advances more rapidly into education services; industry, government, and academy are awakened to the concept of embedding services innovation. This theoretical paper offers an integrated framework for education systems (IFES) covering two intersecting dimensions where service innovation and service science can take place. As an effort to contribute in the area of service innovation and service sciences, an interdisciplinary approach is applied, interconnecting an array of competences across the different stakeholders. It is hypothesized that to increase productivity in education industries, interconnecting knowledge and resources from diverse areas and across different stakeholders through the co-lineation of four dimensions: (1) information, communications and technology; (2) skills and tools; (3) people and attitudes; (4) systems, processes and management; are essential to creating service innovation. This paper contributes a perspective of interconnectivity balanced with harmony that are crucial for effective productivity and service innovation by adopting a service science approach