Article
Engineering, Marine
Pingzheng Li, Yanqun Wu, Wei Guo, Chunyan Cao, Yanxin Ma, Lifan Li, Hongze Leng, Aolong Zhou, Junqiang Song
Summary: This paper proposes two methods for source ranging: a low-pass filtering method after 2D-DFT to separate signals from interference and noise, and an extraction and phase compensation method based on time-frequency spectrogram for linear frequency-modulated signals without known waveform.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Stefano De Nicola, Alexios A. Michailidis, Maksym Serbyn
Summary: This paper investigates the dynamical quantum phase transitions (DQPTs) in two-dimensional systems by considering semi-infinite ladders of varying width. The concepts of precession (pDQPTs) and entanglement (eDQPTs) DQPTs are extended and studied in this context. The phenomenology of pDQPTs and eDQPTs in square lattices show similar characteristics to the one-dimensional case, while honeycomb lattices with an odd number of nearest neighbors exhibit beyond one-dimensional classification.
Article
Physics, Applied
Jiawei Qiu, Yuxuan Zhou, Chang-Kang Hu, Jiahao Yuan, Libo Zhang, Ji Chu, Wenhui Huang, Weiyang Liu, Kai Luo, Zhongchu Ni, Xianchuang Pan, Zhixuan Yang, Yimeng Zhang, Yuanzhen Chen, Xiu-Hao Deng, Ling Hu, Jian Li, Jingjing Niu, Yuan Xu, Tongxing Yan, Youpeng Zhong, Song Liu, Fei Yan, Dapeng Yu
Summary: To achieve scalable quantum information processing, the ability to tune multi-qubit interactions is crucial. However, this can lead to difficulties in precise manipulation of quantum states. The use of dynamical decoupling techniques has been shown to effectively suppress coherent errors between multi-qubits, resulting in an enhancement in pure dephasing time.
PHYSICAL REVIEW APPLIED
(2021)
Article
Engineering, Electrical & Electronic
Zhi-Chao Zhang, Ao Sun, Zi-Yue Liang, Jing-Chi Li, Wen-Hua Liu, Xi-Ya Shi, An-Yang Wu
Summary: Sampling theorems for the two-dimensional linear canonical transform in polar coordinates play a crucial role in medical imaging, offering superior solutions for non-bandlimited image processing problems. Two types of interpolation formulae, the LCT and the LCHT, are derived for angularly periodic and highest frequency limited functions, with the latter outperforming the former in computational complexity. The selection of interpolation formula can significantly impact the efficiency of computations in image processing.
DIGITAL SIGNAL PROCESSING
(2021)
Article
Multidisciplinary Sciences
Saquib Shamim, Wouter Beugeling, Pragya Shekhar, Kalle Bendias, Lukas Lunczer, Johannes Kleinlein, Hartmut Buhmann, Laurens W. Molenkamp
Summary: Researchers have successfully demonstrated the quantized spin Hall resistance in HgTe quantum wells alloyed with magnetic Mn atoms at very low temperatures, due to the Kondo screening effect. This work lays the foundation for future investigations into magnetically doped quantum spin Hall materials and the realization of chiral Majorana fermions.
NATURE COMMUNICATIONS
(2021)
Article
Mathematics, Applied
Haiye Huo
Summary: This paper presents error estimation and convergence analysis for two-dimensional (2D) sampling series in the LCT domain. The absolute convergence and uniform convergence of 2D LCT sampling series are first proven, followed by an analysis of truncation error estimates for uniformly sampling 2D bandlimited signals in the LCT domain and derivation of three truncation error bounds. The theoretical results are then demonstrated through numerical examples.
MATHEMATICAL METHODS IN THE APPLIED SCIENCES
(2021)
Article
Geochemistry & Geophysics
Fulai Wang, Nanjun Li, Chen Pang, Chao Li, Yongzhen Li, Xuesong Wang
Summary: In this letter, a method based on jointly designing complementary sequences and receiving filters to suppress interrupted sampling repeater jamming (ISRJ) is proposed. The sequences and filters are optimized alternately using a gradient-based nonlinear programming solver and the Lagrange multiplier method. Numerical results demonstrate that the proposed method can generate sequences and receiving filters with good correlation properties and anti-ISRJ performance.
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
(2022)
Article
Optics
Shuki Okamura, Kyogo Osawa, Chao Zhang, Fumihiko Ito, Atsushi Nakamura, Yusuke Koshikiya
Summary: We demonstrate the first-ever two-dimensional linear optical sampling of fiber spatial modes. The fiber cross sections excited by LP01 or LP11 modes are directly projected onto a two-dimensional photodetector array and coherently sampled by local pulses with a uniform spatial distribution. This ultrafast and direct observation allows for the characterization of space-division multiplexing fiber with high time accuracy and wide bandwidth using electronics with a bandwidth of only a few MHz.
Article
Soil Science
Xiao-Lin Sun
Summary: This study evaluated errors in soil spectroscopy measurements from intact soil cores, finding that errors induced by different spectral measurement positions accounted for 75% of the modeling error, while errors from instrument noise were negligible. Additionally, errors from different soil core sampling positions were also considerable. These findings provide important insights for accounting for uncertainties in soil property measurements using spectroscopy in the field.
Article
Physics, Multidisciplinary
Shanshan Ding, G. A. Dominguez-Castro, Aleksi Julku, Arturo Camacho-Guardian, Georg M. Bruun
Summary: This study investigates mobile impurities immersed in a Bose-Einstein condensate in a two-dimensional lattice to understand the interactions and possible bound states of quasiparticles. The results show the emergence of a new type of quasiparticle and the spatial influence of impurity-boson interactions. By deriving an effective Schrodinger equation, it is demonstrated that the attractive interaction between two polarons in the lattice leads to the formation of bound states, known as bipolarons.
Article
Food Science & Technology
Jian-E Dong, Zhi-Tian Zuo, Ji Zhang, Yuan-Zhong Wang
Summary: The study used a novel digital image method based on 2DCOS and i2DCOS to discriminate the geographical origins of Boletus edulis mushrooms. Results showed that the synchronous 2DCOS spectra model accurately classified samples from different regions with 100% accuracy in both the test and validation sets, demonstrating good discrimination performance. This new analytical method has potential applications in quality control of food, herb, and agricultural products.
Article
Chemistry, Multidisciplinary
Gang Li, Zheng Chen, Hanlin Zhang, Mengxi Yu, Hui Zhang, Jiawnag Chen, Zihan Wang, Shiqi Yin, Weichang Lin, Penglai Gong, Longhui Zeng, Xiangde Zhu, Wensen Wei, Mingliang Tian, Liang Li
Summary: This study carefully describes the multi-degree-of-freedom of optical anisotropy based on 2D PdPS flakes, where four critical switching wavelengths are observed, leading to wavelength-dependent behavior and five wavelength bands for a selective photodetector approach. The unique wavelength-selective property shows great potential for the miniaturization and integration of photodetectors.
Article
Materials Science, Multidisciplinary
Owen Bradley, George G. Batrouni, Richard T. Scalettar
Summary: The Holstein Hamiltonian describes fermions interacting with phonons on a lattice. It predicts the behavior of dressed quasiparticles and the formation of superconducting and charge density wave phases at different densities. Quantum Monte Carlo calculations have been used to determine critical temperatures for these phase transitions in various lattice geometries.
Article
Computer Science, Theory & Methods
Henry Antonio Palasciano, Guy P. Nason
Summary: Sub-sampling in image processing can lead to aliasing if the highest frequency in the underlying process exceeds the Nyquist frequency. While techniques to prevent aliasing have been proposed, there is limited research on methods to detect it. Recent work by Eckley and Nason (Biometrika 105(4), 833-848, 2018) presents a test for the absence of aliasing and/or white noise in locally stationary wavelet processes. We extend their findings to two-dimensional processes and develop a procedure to test for aliasing and/or white noise in a fixed point, demonstrating its effectiveness through simulations and an example. Additionally, we discuss the possibility of extending these methods to videos.
STATISTICS AND COMPUTING
(2023)
Article
Physics, Fluids & Plasmas
Federico Petronio, Thomas Charoy, Alejandro Alvarez Laguna, Anne Bourdon, Pascal Chabert
Summary: Using 2D particle-in-cell (PIC) simulations coupled to a fluid description, this study investigates the electrostatic instabilities occurring in the axial-azimuthal plane of a Hall thruster during low-frequency oscillation periods. The spectral density reconstruction method is employed to analyze the different electrostatic higher frequency modes in the plasma, revealing the presence of both axial and azimuthal instabilities. This understanding is crucial for comprehending the growth and propagation of these instabilities in the thruster channel and plume.
PHYSICS OF PLASMAS
(2023)
Article
Chemistry, Physical
T. Kunsel, A. Loehner, J. J. Mayo, J. Koehler, T. L. C. Jansen, J. Knoester
JOURNAL OF CHEMICAL PHYSICS
(2020)
Article
Chemistry, Physical
Andy S. Sardjan, Floris P. Westerman, Jennifer P. Ogilvie, Thomas L. C. Jansen
JOURNAL OF PHYSICAL CHEMISTRY B
(2020)
Article
Chemistry, Physical
Hoang Long Nguyen, Thanh Nhut Do, Parveen Akhtar, Thomas L. C. Jansen, Jasper Knoester, Wenda Wang, Jian-Ren Shen, Petar H. Lambrev, Howe-Siang Tan
Summary: The marine green macroalga Bryopsis corticulans has unique light-harvesting complexes compared to those in plants, as revealed by fitting analysis of its LHCII. The fitting method's robustness in matching experimental data demonstrates its effectiveness in systems lacking precise pigment assignment and spatial information.
JOURNAL OF PHYSICAL CHEMISTRY B
(2021)
Article
Chemistry, Physical
Youssef El Khoury, Guillaume Le Breton, Ana. V. Cunha, Thomas L. C. Jansen, Luuk J. G. W. van Wilderen, Jens Bredenbeck
Summary: This article reveals that assigning features in amide I difference signals to distinct secondary structure elements may not be justified in many cases, as evidenced by the study on the protein cytochrome c. Each secondary structure unit shows broad overlapping contributions in the amide I range, potentially leading to intensity-compensating and even sign-changing contributions during difference absorption experiments.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Chemistry, Physical
Atreya Majumdar, Thomas L. C. Jansen
Summary: The study proposes a new molecular system for unidirectional rotation caused by electric coupling of chromophores, avoiding the slow thermally activated step and potentially leading to faster operational speeds. Quantum-classical calculations were employed to study the dynamics of this system, estimating the potential for completing a full rotation on a subnanosecond time scale.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Correction
Chemistry, Multidisciplinary
Carlos R. Baiz, Bartosz Blasiak, Jens Bredenbeck, Minhaeng Cho, Jun-Ho Choi, Steven A. Corcelli, Arend G. Dijkstra, Chi-Jui Feng, Sean Garrett-Roe, Nien-Hui Ge, Magnus W. D. Hanson-Heine, Jonathan D. Hirst, Thomas L. C. Jansen, Kijeong Kwac, Kevin J. Kubarych, Casey H. Londergan, Hiroaki Maekawa, Mike Reppert, Shinji Saito, Santanu Roy, James L. Skinner, Gerhard Stock, John E. Straub, Megan C. Thielges, Keisuke Tominaga, Andrei Tokmakoff, Hajime Torii, Lu Wang, Lauren J. Webb, Martin T. Zanni
Article
Chemistry, Physical
Thomas L. C. Jansen
Summary: This paper reviews the computational spectroscopy methods that have been developed and applied for infrared and visible spectroscopies in the condensed phase over the past decade, discussing the questions that these methods have allowed answering and current/future challenges and solutions.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Chemistry, Physical
T. Kunsel, T. L. C. Jansen, J. Knoester
Summary: Exciton diffusion in linear aggregates is analyzed systematically, revealing three scaling regimes associated with fully delocalized, weakly localized, and strongly localized exciton states. The scaling powers match well with analytically estimated ones, with numerical results confirming the quantum Goldilocks principle in the weakly localized regime.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Chemistry, Physical
T. Kunsel, L. M. Guenther, J. Koehler, T. L. C. Jansen, J. Knoester
Summary: The study explores the use of single-object spectroscopy to probe size variations of bacteriochlorophyll aggregates in chlorosomes. By combining linear polarization resolved spectroscopy and circular dichroism spectroscopy, it is possible to access and probe the typical size of tubular aggregates within chlorosomes, revealing potential differences between individual chlorosomes.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Chemistry, Physical
Vishesh Saxena, Ruben Steendam, Thomas L. C. Jansen
Summary: In this study, we simulated the vibrational spectra of three proposed fibril structures of the human islet amyloid polypeptide and analyzed the isotope-labeled spectra. The results showed that the cryo-electron microscopy structure had the best match with experimental data. Additionally, the study found that failures in predicting spectral peak shifts may occur when the isotope-labeled spectra are broad compared to the coupling or exhibited structure. These findings are important for the search of potential toxic fibril formation intermediates.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
M. Manrho, T. L. C. Jansen, J. Knoester
Summary: This paper investigates the effect of charge transfer (CT) states on the absorption spectrum of linear molecular aggregates using a scattering matrix technique. The research finds that the absorption spectrum exhibits a characteristic two-peak shape in both weak and strong coupling regimes, and suggests that the skewness of the high-frequency peak can be used to identify the strength of exciton-CT state coupling.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Kim E. van Adrichem, Thomas L. C. Jansen
Summary: This paper presents a new analysis program called AIM, which allows extracting the vibrational amide-I Hamiltonian for protein infrared spectroscopy modeling using molecular dynamics trajectories. The program enables the calculation of infrared absorption spectra, vibrational circular dichroism, and two-dimensional infrared spectra, facilitating the study of protein structure and dynamics. AIM is freely available on GitHub and includes a user-friendly demonstration.
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
(2022)
Article
Chemistry, Physical
Thanh Nhut Do, Hoang Long Nguyen, Parveen Akhtar, Kai Zhong, Thomas L. C. Jansen, Jasper Knoester, Stefano Caffarri, Petar H. Lambrev, Howe-Siang Tan
Summary: The study investigates the ultrafast excitation energy transfer processes in the LHCII(M)-CP29-CP24 complex of photosystem II, showing faster energy equilibrations and shorter bottleneck state lifetimes compared to LHCII. Structural changes in LHCII(M) in the bigger assembly are attributed to the accelerated dynamics observed.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Kai Zhong, Hoang Long Nguyen, Thanh Nhut Do, Howe-Siang Tan, Jasper Knoester, Thomas L. C. Jansen
Summary: This paper presents a new time-domain method for calculating energy transfer in photosynthetic antenna complexes based on the combination of multichromophoric Forster resonance energy transfer theory and the Numerical Integration of the Schrodinger Equation method. The method accurately describes the energy transfer rate for biologically relevant multichromophoric systems similar to the LH2 complex. This method has computational tractability and may have potential applications in calculating transfer in artificial systems. Overall, it receives a score of 8 out of 10.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Vesna Eric, Xinmeng Li, Lolita Dsouza, Sean K. Frehan, Annemarie Huijser, Alfred R. . Holzwarth, Francesco Buda, G. J. Agur Sevink, Huub J. M. de Groot, Thomas L. C. Jansen
Summary: In this study, the microscopic sources of disorder causing spectral width in chlorosomes are identified. It is found that hydrogen bonding motifs are essential for an accurate description of the spectral line shape and that exciton delocalization is consistent with the two-dimensional electronic spectra.
JOURNAL OF PHYSICAL CHEMISTRY B
(2023)