Optical Probing of Ultrafast Laser-Induced Solid-to-Overdense-Plasma Transitions

Understanding the target dynamics during its interaction with a relativistic ultrashort laser pulse is a challenging fundamental multi-physics problem involving at least atomic and solid-state physics, plasma physics, and laser physics. Already, the properties of the so-called pre-plasma formed as the laser pulse's rising edge ionizes the target are complicated to access in experiments and modeling, and many aspects of this laser-induced transition from solid to overdense plasma over picosecond time scales are still open questions. At the same time, applications like laser-driven ion acceleration require precise knowledge and control of the pre-plasma because the efficiency of the acceleration process itself crucially depends on the target properties at the arrival of the relativistic intensity peak of the pulse. By capturing the dynamics of the initial stage of the interaction, we report on a detailed visualization of the pre-plasma formation and evolution. Nanometer-thin diamond-like carbon foils are shown to transition from solid to plasma during the laser rising edge with intensities < 10^16 W/cm^2. Single-shot near-infrared probe transmission measurements evidence sub-picosecond dynamics of an expanding plasma with densities above 10^23 cm^-3 (about 100 times the critical plasma density). The complementarity of a solid-state interaction model and a kinetic plasma description provides deep insight into the interplay of ionization, collisions, and expansion

Holistic Assessment of Community Palliative Care Needs Among Palestinian Cancer Patients

Background: Palliative care focuses on improving the quality of life of terminally ill patients and their families. Objectives: This cross-sectional study aims to assess the level of community palliative care among terminally ill Palestinian cancer patients and the needs of their families in the West-Bank and Gaza strip. Methodology: A cross-sectional survey was conducted among cancer patients. Patients were recruited through five hospitals that provide cancer care in the West Bank and Gaza Strip (Al-Hussein Hospital, Beit Jala; Augusta Victoria Hospital, Jerusalem; Istishari Arab Hospital, Ramallah; European Hospital and Abd Al-Aziz Al-Rantisi Hospital; Gaza). Data were collected using an interview-based questionnaire. The questionnaire focused on assessment of physical, psychosocial, emotional, and spiritual components of palliative care. In addition, the questionnaire assessed caregiver’s needs. Results: A total of 238 patients were interviewed. The mean age of the participants was 53.8±15 years. The most common types of cancer among patients were breast cancer (51 [21.4%]) and colorectal cancer (33 [13.9%]). Fifty percent of the patients had their children as their primary caregivers. Overall, the majority of the patients had good psychosocial, spiritual, and emotional scores. On the other hand, >80% had moderate to poor physical functioning scores. Psychosocial and emotional scores decreased significantly as the disease progressed. More than 33% of the patients reported that their caregivers were in need of financial, legal, and work-related support. In addition, other commonly reported unmet needs included support in understanding what to expect in the future and dealing with the feelings and worries of the patient. Conclusions: Cancer patients suffer mostly from their physical symptoms in addition to financial problems. On the other hand, assessment of the emotional, spiritual and psychological functioning of Palestinian patients indicates that the strength of religious beliefs and the support of the family and the friends in the Palestinian community had a great impact on the patients and help reduced the gap in palliative care services

Petawatt-class laser optimization and ultrashort probe pulse generation for relativistic laser-plasma interactions

Advancements in high peak power laser development have resulted in laser systems capable of accelerating charged particles in a plasma to nearly the speed of light. For a comprehensive understanding and optimization of such interactions towards higher experimental yields, further enhancements in the laser system performance are required, along with a method that enables a direct view into the laser-induced plasma with a high spatial and temporal resolution. The work presented in this thesis details the results of multiple investigations regarding upgrades to the petawatt-class POLARIS laser and the development of a multi-beam ultrashort laser system for probing relativistic laser-plasma interactions at Friedrich Schiller University and Helmholtz Institute in Jena, Germany

Exploring local job seekers perception toward employment in the private and public sectors in Qatar: implications for workforce nationalization policies

Purpose: The influx of expatriates to the Gulf Cooperation Council (GCC) countries has led to labor imbalance inducing these countries to initiate workforce nationalization policies. However, despite the policies' emphasis on increasing the presence of nationals in all sectors, employing nationals in the private sector is still a critical challenge for policymakers. This paper explores local job seekers' and employees' perceptions of employment choices in the private and public sectors. Design/methodology/approach: Adopting a qualitative approach, data were collected through in-depth interviews with 28 local job seekers, either not currently employed or employed but seeking another job. Findings: The data revealed a contextualized understanding of positive and negative connotations pertaining to employment in the private and public sectors in Qatar. Research limitations/implications: Understanding nationals' negative preconceived notions against working in the private sector and the perceived benefits of public sector employment lays the groundwork for developing measures to help policymakers to create labor market-oriented policies that stimulate mobility between the public and private sectors. Originality/value: This study contributes to the workforce nationalization literature in the GCC countries by examining local job seekers' perceptions associated with employment in the private sector and the public sector. A closer examination of why nationals are hesitant to enter the private sector can propel the pendulum towards higher success rates of workforce nationalization.This paper was made possible by the NPRP grant# [12S-0311-190314] from the Qatar National Research Fund (a member of Qatar Foundation). The statements made herein are solely the responsibility of the authors