Article
Multidisciplinary Sciences
Yogesh Kumar Gupta, Aditya Goel
Summary: A free space optical module is used for signal transmission in laser communication. However, the efficiency of free space optical communication is compromised for long-distance transmission due to atmospheric constraints. To enhance the performance in terms of energy efficiency, spectral efficiency, and long-distance transmission, a study combines Higher-order Gaussian filter (HGF), post-amplification, and homodyne detection. The proposed framework achieves a channel capacity of over 320 Gbps, a 112% transmission range enhancement, and a 100% reduction in transmitted power, which are significantly more significant compared to previous studies.
Article
Engineering, Electrical & Electronic
B. Banuselvasaraswathy, R. Priya, T. Chinnadurai
Summary: A novel architecture integrating free space optics and non-zero dispersion shifted fiber links is proposed for high-speed data transmission in long haul body area network applications. The architecture supports wavelength division multiplexing and 4 x 4 MIMO-FSO technique to enhance bandwidth capacity and mitigate atmospheric turbulence effects. Comparative analysis shows that the proposed architecture outperforms traditional single mode fiber in terms of Q factor under different weather conditions.
OPTICAL AND QUANTUM ELECTRONICS
(2022)
Article
Optics
Yu Liu, Xin Li, Daixuan Li, Lu Zhang, Shanguo Huang
Summary: Low-orbit satellite communication can provide users with low-delay and ultra-wideband communication services using free-space optical (FSO) feeder links. However, the characteristics of FSO feeder links vary during satellite passes, and atmospheric turbulence affects link capacity and requires capacity adjustment and handover to balance network throughput and dynamics.
Article
Engineering, Electrical & Electronic
Vuong Mai, Hoon Kim
Summary: This letter explores the possibility of using VFLL-based system for wavelength-division-multiplexed (WDM) FSO communications. The wavelength dependence of VFLL-based optical beam steering and divergence control is investigated through experiment and theory, and the transmission of 4 x 10-Gb/s WDM signals over a 104-m FSO link is demonstrated.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2022)
Article
Computer Science, Information Systems
Chien-Hung Yeh, Wen-Piao Lin, Syu-Yang Jiang, Shang-En Hsieh, Ching-Hsuan Hsu, Chi-Wai Chow
Summary: This study presents a new WDM-PON system to support blended fiber and free space optics (FSO) signal access. The C- and L-band channels are used to provide simultaneous fiber and FSO traffics. Additionally, the proposed WDM access architecture offers a self-restored mechanism to avoid fiber breakpoints in the fiber access traffic.
Article
Physics, Multidisciplinary
Jinjin Du, Thibault Vogt, Wenhui Li
Summary: We introduce well-separated 87Rb+ ions into an atomic ensemble and achieve single-shot imaging of individual ions with an exposure time of 1 mu s using homodyne detection. The ion detection fidelity is (80 +/- 5)% as analyzed from the absorption spots in the acquired images. These in situ images provide a direct visualization of ion-Rydberg interaction blockade and reveal spatial correlations between Rydberg excitations. The capability of imaging individual ions in a single shot is important for studying collisional dynamics in hybrid ion-atom systems and for using ions as probes in quantum gas measurements.
PHYSICAL REVIEW LETTERS
(2023)
Review
Crystallography
Taiguang Jin, Shuwei Hao, Yunfei Shang, Zuotao Lei, Chunhui Yang
Summary: This article reviews recent investigations on the use of typical Elpasolite scintillators for the monitoring of gamma rays and neutrons. These Elpasolite crystals possess modest light yield and excellent proportionality when excited by gamma rays, as well as excellent neutron detection capability. The article discusses the scintillation properties, detection mechanism, and crystal structure of Elpasolite, aiming to improve high-energy ray detection ability.
Article
Optics
Jinjia Li, Demao Ye, Kang Fu, Linning Wang, Jinlong Piao, Yongjin Wang
Summary: SiPMs are modern solid-state photodetectors with high sensitivity to detect weak light signals in underwater communication; the combination of SiPM advantages and the MIMO scheme shows potential for long-distance UWOC under optical turbulence.
Article
Physics, Multidisciplinary
Peidong Liang, Chentao Zhang, Jamel Nebhen, Sushank Chaudhary, Xuan Tang
Summary: The need for delivering sensitive biomedical sensor data in hospital settings poses a challenge for researchers, with Radio over Free space (Ro-FSO) systems potentially offering a solution. This study explores the possibility of utilizing MDM-WDM scheme to transmit high-speed broadband data and evaluates its feasibility in hospital environments.
FRONTIERS IN PHYSICS
(2021)
Article
Optics
Hassan T. Al-Ahsab, Mingjian Cheng, Lixin Guo, Yuancong Cao, Shuailing Wang
Summary: In this study, the researchers used the Rytov approximation to investigate the detection probability of orbital angular momentum (OAM) in multi-Gaussian correlated anomalous vortex (MGCAV) beams under non-Kolmogorov maritime atmospheric turbulence. The results show that the OAM detection probability is influenced by various factors, including beam parameters and the characteristics of maritime atmospheric turbulence. Furthermore, the study reveals the superior resilience of Gaussian-Schell correlated anomalous vortex (GSCAV) beams in mitigating the impact of maritime atmospheric turbulence.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
(2023)
Article
Optics
Likun Zhou, Pan Liu, Guang-Ri Jin
Summary: By maximizing classical Fisher information, we derive an optimal method for phase measurement with three bins, showing better resolution and achievable sensitivity than the binary-outcome case. Finally, an approximate maximum Likelihood estimator is proposed to asymptotically reach the ultimate lower bound of phase sensitivity.
Article
Optics
Maged A. Esmail
Summary: This study evaluates the performance of key channel models in free space optic systems under weak turbulence conditions and proposes a new empirical channel model that performs well. Results show that most models fail to fit the dataset under very weak turbulence, while all models except one fit the dataset under weak turbulence.
OPTICS COMMUNICATIONS
(2021)
Article
Optics
Ching-Hsuan Hsu, Syu-Yang Jiang, Shang-En Hsieh, Chien-Hung Yeh, Yu-Ting Lai, Lan-Yin Chen, Shien-Kuei Liaw, Chi-Wai Chow
Summary: This research introduces a blended WDM-PON architecture that delivers both baseband and FSO signals using two wavelength bands to avoid interference, providing self-protected operation in a fiber-FSO access network against fiber breakage. The study applies eight WDM wavelengths with 24.3 Gbit/s OOK modulation to evaluate the BER performances of baseband and FSO signals through fiber and wireless FSO connections.
Article
Computer Science, Information Systems
Jae-Young Choi, Joon-Woo Lee, Sang-Kook Han
Summary: This study introduces an adaptive thresholding optical detection technique using stochastic approximation to improve receiver performance in multi-level PAM based FSO transmission. Experimental results show that this technique outperforms the fixed threshold decision scheme in various turbulence channels. Additionally, the adaptive threshold decision scheme achieves about 3dB gain compared to an even-valued threshold decision scheme when considering the ASE noise of an EDFA.
Article
Engineering, Electrical & Electronic
Toshimasa Umezawa, Shoichi Takamizawa, Atsushi Matsumoto, Kouichi Akahane, Naokatsu Yamamoto, Atsushi Kanno, Tetsuya Kawanishi
Summary: This paper presents a newly developed resonant cavity 4-lambda integrated two-dimensional 4 x 4 photodetector array (2D-PDA) device and its application for wavelength-division-multiplexing (WDM) free-space optical (FSO) communication. The 2D-PDA simplifies the optical alignment process for single-mode fiber coupling and reduces the need for beam-tracking function. In the WDM-FSO communication demonstration, a four-wavelength beam was successfully received by 4-different cavity length PD pixels in the 4 x 4 PDA with crosstalk between each channel. The paper discusses the fabrication and characteristics of the 2D-PDA device and demonstrates 25 Gbps/lambda FSO communication using the 4 x 4 2D-PDA, taking into account crosstalk and bit error rate in 2-WDM and 3-WDM FSO communication demonstrations.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Review
Oncology
Prince Singh Rajput, Sharib Raza Khan, Preeti Singh, Pooja A. Chawla
Summary: This review summarizes various aspects of Lurbinectedin in the treatment of small cell lung cancer, including its chemical synthesis, mechanism of action, adverse reactions, and clinical trial results. The study findings suggest that Lurbinectedin inhibits tumor-related macrophages by inhibiting the active transcription of encoding genes, which has an impact on the tumor environment. It is considered a potential drug candidate for the treatment of small cell lung cancer.
ANTI-CANCER AGENTS IN MEDICINAL CHEMISTRY
(2022)
Article
Pediatrics
Dhirendra Pratap Singh, Preeti Singh, Suvasini Sharma, Satinder Aneja, Anju Seth
Summary: The study found that a large proportion of children with type 1 diabetes mellitus have subclinical peripheral neuropathy, with poor glycemic control and longer duration of diabetes being risk factors for nerve dysfunction. Neurophysiological studies are recommended for early detection in these children.
INDIAN JOURNAL OF PEDIATRICS
(2022)
Article
Pediatrics
Preeti Singh, Karanvir Attri, Deonath Mahto, Virendra Kumar, Dipti Kapoor, Anju Seth, Varinder Singh, Harish Pemde, Praveen Kumar, Ravitanaya Sodani, Ankita Goel
Summary: The study found that 8.73% of children tested positive for SARS-CoV-2 infection. Majority of children admitted with COVID-19 had severe illness due to malnutrition and comorbidities.
INDIAN JOURNAL OF PEDIATRICS
(2022)
Article
Pediatrics
Ankita G. Sharma, Virendra Kumar, Ravitanaya Sodani, Anuja Sapre, Preeti Singh, Abhijeet Saha, Suvasini Sharma, Sandip Ray, Harish Pemde
Summary: The study identified hypoxia at admission, involvement of three or more organ systems, acute kidney injury, thrombocytopenia, and elevated serum C-reactive protein as predictors of in-hospital mortality in children admitted with SARS-CoV-2 infection.
JOURNAL OF PAEDIATRICS AND CHILD HEALTH
(2022)
Article
Telecommunications
Chamandeep Kaur, Preeti Singh, Amandeep Bisht, Garima Joshi, Sunil Agrawal
Summary: EEG is gaining recognition in real-time applications, but the issue of poor spatial resolution in brain source localization persists. This paper provides an overview of recent EEG inverse solutions and comparative analysis, discussing challenges with existing source reconstruction algorithms. Further research is needed to improve spatial resolution and noise sensitivity of EEG localization methods.
WIRELESS PERSONAL COMMUNICATIONS
(2022)
Review
Oncology
Reem S. Chamseddine, Cathy Wang, Kanhua Yin, Jin Wang, Preeti Singh, Jingan Zhou, Mark E. Robson, Danielle Braun, Kevin S. Hughes
Summary: This systematic review identified 15 studies on penetrance of male breast cancer susceptibility genes, with pathogenic variants in ATM, BRCA2, CHEK2 c.1100delC, and PALB2 showing increased risk for MBC. Seven of these studies adjusted for ascertainment bias and their findings are considered applicable to the general population.
BREAST CANCER RESEARCH AND TREATMENT
(2022)
Article
Plant Sciences
Deepak Kumar, Ravi Rajwanshi, Preeti Singh, Mohd Aslam Yusuf, Neera Bhalla Sarin
Summary: In this study, we generated B. juncea plants coexpressing gly I and gamma-TMT through crossing and compared their performance with wild-type and single transgenic lines. Our results demonstrate that B. juncea plants coexpressing gly I and gamma-TMT exhibit a more robust antioxidant response and higher tolerance under stress conditions.
PHYSIOLOGIA PLANTARUM
(2022)
Article
Physics, Condensed Matter
Preeti Singh, Vandana Kumari, Manoj Saxena, Mridula Gupta
Summary: In this work, simulation-based research on a novel All-GaN-Integrated Cascode (AGC) MISHEMT with a quaternary layer InyAlxGa1-x-yN as backbarrier has been conducted. The research shows that AGC-MISHEMTs with a sandwich back barrier (SW-BB) exhibit improvements in drain current density, I-ON/I-OFF ratio, transconductance-peak, and breakdown voltage compared to AGC-MISHEMT with GaN buffer. Additionally, increasing the gate oxide thickness under gate 2 enhances the drain current density. Power switching performance of AGC-MISHEMT with SW-BB is significantly better than that of Recessed Single Gate (RSG) MISHEMT, with reduced power switching losses. Moreover, the introduction of a quaternary InAlGaN layer in the backbarrier results in considerable reduction in power loss during the OFF state.
MICRO AND NANOSTRUCTURES
(2022)
Article
Public, Environmental & Occupational Health
Taru Goyal, Prasenjit Mitra, Preeti Singh, Shailja Sharma, Purvi Purohit, Praveen Sharma
Summary: Occupational exposure to lead and cadmium is associated with changes in immune-modulatory cytokines, potentially leading to an inflammatory response. Co-exposure to low levels of lead and cadmium may increase certain cytokine levels such as IL-4 and IL-17, suggesting a metal-induced pro-inflammatory immune response.
TOXICOLOGY AND INDUSTRIAL HEALTH
(2022)
Article
Telecommunications
Preeti Singh, Maneesha Gupta, Bhawna Aggarwal, Shireesh Kumar Rai
Summary: A new wideband high gain CMOS transimpedance amplifier is proposed in this paper, which increases both gain and bandwidth through a gain enhancing path and mathematical analysis. Simulation results show that the proposed TIA achieves high performance with small area and low power consumption.
WIRELESS PERSONAL COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Alka Agarwal, Preeti Singh, Anand Maurya, Upendra Kumar Patel, Alka Singh, Gopal Nath
Summary: A new series of ciprofloxacin conjugates containing 1,2,3-triazole were designed, synthesized, and evaluated for their antimicrobial activity. Some of the conjugates showed superior activity compared to the control drug ciprofloxacin, and exhibited low hemolysis on red blood cells.
Article
Astronomy & Astrophysics
Ashley S. Nemec-Bakk, Vijayalakshmi Sridharan, Reid D. Landes, Preeti Singh, Maohua Cao, Paari Dominic, John W. Seawright, Jeffery C. Chancellor, Marjan Boerma
Summary: This study assessed the effects of oxygen ions on the heart of female mice and found that O-16 ion exposure did not result in cardiac fibrosis or dysfunction, but mild cardiac remodeling occurred.
LIFE SCIENCES IN SPACE RESEARCH
(2022)
Editorial Material
Cell Biology
Peter Dornbos, Preeti Singh, Dong-Keun Jang, Anubha Mahajan, Sudha B. Biddinger, Jerome I. Rotter, Mark I. McCarthy, Jason Flannick
Summary: This study investigates the incorporation of human genetic data in exploring new links between genes and metabolic disease. To facilitate the utilization of genetic data, the authors present an approach that enables researchers to evaluate the human genetic support for experimentally determined hypotheses.
Article
Pediatrics
Jagdish Chandra, Pooja Dewan, Praveen Kumar, Amita Mahajan, Preeti Singh, Bhavna Dhingra, Nita Radhakrishnan, Ratna Sharma, Mamta Manglani, Ashok Kumar Rawat, Piyush Gupta, Sunil Gomber, Sunil Bhat, Parag Gaikwad, K. E. Elizabeth, Deepak Bansal, Anand Prakash Dubey, Nitin Shah, Pranoti Kini, Amita Trehan, Kalpana Datta, G. V. Basavraja, Vineet Saxena, Remesh R. Kumar
Summary: Anemia in children is a significant public health problem in our country, with more than 50% of cases being attributed to nutritional deficiency. The prevalence of anemia in children under the age of five has increased from 59% to 67.1% over the past five years. The existing public health programs have not yielded desired results, highlighting the need for nationally accepted guidelines for the diagnosis, treatment, and prevention of nutritional anemia in children.
