bluuebunny/crossref_metadata_2025 huggingface dataset:
Amino-OPE glycosides and blue light: a powerful synergy in photodynamic therapy
Authors: Lara-Pardo Andrea , Mancuso Aurora , Simón-Fuente Silvia , Bonaccorsi Paola M. , Gangemi Chiara M. A. , Moliné María Ángeles , Puntoriero Fausto , Ribagorda Maria , Barattucci Anna , Sanz-Rodriguez Francisco
Published: December 2022

Amino-OPE glycosides have been synthesized and tested as PSs in PDT under blue light.
Tricyclic octaurea “Temples” for the recognition of polar molecules in water
Authors: Webster Claire S. , Balduzzi Federica , Davis Anthony P.
Published: December 2022

New second-generation “Temples” with bis-urea pillars and pyrenyl roof/floors show selective binding to polar aromatic compounds in aqueous media, with strong fluorescence responses.
Continuous synthesis of block copolymer nanoparticlesviatelescoped RAFT solution and dispersion polymerisation in a miniature CSTR cascade
Authors: Pittaway Peter M. , Ghasemi Ghadir , Knox Stephen T. , Cayre Olivier J. , Kapur Nikil , Warren Nicholas J.
Published: December 2022

Miniaturised continuous-flow reactors offer an economical and scalable route to explore the synthesis of block copolymersviaRAFT mediated polymerisation-induced self-assembly (PISA).
Microstructural evolution and reverse flow in shear-banding of entangled polymer melts
Authors: Boudaghi Mahdi , Edwards Brian J. , Khomami Bamin
Published: December 2022

The temporal and spatial evolution of shear banding and reverse flow under startup of shear flow was investigated for highly entangled, linear, monodisperse polyethylene melts of differing molecular weight, C750H1502, C1200H2402, and C3000H6002.
Single crystal H-Nb2O5 growing along the [001] crystal direction for ultrafast lithium storage
Authors: Huang Huiying , Kuai Hongxiang , Ding Xiaobo , Hu Benrui , Chen Yuancheng , Zhou Qingfeng , Xiong Xunhui
Published: December 2022

Single crystal H-Nb2O5 grown along the [001] crystal direction was synthesized by a simple and effective one-pot annealing process. This structure can more effectively maintain structural integrity and significantly improve Li+ diffusion kinetics.
A multiphoton transition activated iron based metal organic framework for synergistic therapy of photodynamic therapy/chemodynamic therapy/chemotherapy for orthotopic gliomas
Authors: Lv Zhijia , Cao Yue , Xue Dongzhi , Zhang Hao , Zhou Shijie , Yin Na , Li Wanying , Jin Longhai , Wang Yinghui , Zhang Hongjie
Published: December 2022

A novel nanosystem based on NH2-MIL-53 (Fe) modified up-conversion nanoparticles is reported for combined NIR light-mediated photodynamic therapy, chemodynamic therapy and chemotherapy of orthotopic gliomas.
Monotonous alloying-driven band edge emission in two-dimensional hexagonal GaSe1−xTex semiconductors for visible to near-infrared photodetection
Authors: Diep Nhu Quynh , Chen Yu Xun , Nguyen Duc Loc , Duong My Ngoc , Wu Ssu Kuan , Liu Cheng Wei , Wen Hua Chiang , Chou Wu Ching , Juang Jenh Yih , Hsu Yao Jane , Le Van Qui , Chu Ying Hao , Huynh Sa Hoang
Published: December 2022

This work reports molecular beam epitaxy of two-dimensional GaSe1−xTex ternary alloys that have recently attracted a lot of interest in physics and material sciences even though facing crucial challenges in their epitaxial technology.
Overexpression of notch signaling in renin cells leads to a polycystic kidney phenotype
Authors: Belyea Brian C. , Xu Fang , Wiltsie Margaret , Fountain Hayes , Charlton Jennifer , Fogo Agnes B. , Sequeira-Lopez Maria Luisa Soledad , Gomez Roberto Ariel
Published: December 2022

Polycystic kidney disease (PKD) is an inherited disorder that results in large kidneys, numerous fluid-filled cysts, and ultimately end-stage kidney disease. PKD is either autosomal dominant caused by mutations in PKD1 or PKD2 genes or autosomal recessive caused by mutations in the PKHD1 or DZIP1L genes. While the genetic basis of PKD is known, the downstream molecular mechanisms and signaling pathways that lead to deregulation of proliferation, apoptosis, and differentiation are not completely understood. The Notch pathway plays critical roles during kidney development including directing differentiation of various progenitor cells, and aberrant Notch signaling results in gross alternations in cell fate. In the present study, we generated and studied transgenic mice that have overexpression of an intracellular fragment of mouse Notch1 (‘NotchIC’) in renin-expressing cells. Mice with overexpression of NotchIC in renin-expressing cells developed numerous fluid-filled cysts, enlarged kidneys, anemia, renal insufficiency, and early death. Cysts developed in both glomeruli and proximal tubules, had increased proliferation marks, and had increased levels of Myc. The present work implicates the Notch signaling pathway as a central player in PKD pathogenesis and suggests that the Notch-Myc axis may be an important target for therapeutic intervention.
How viral proteins bind short linear motifs and intrinsically disordered domains
Authors: Madhu Priyanka , Davey Norman E. , Ivarsson Ylva
Published: December 2022

Viruses are the obligate intracellular parasites that exploit the host cellular machinery to replicate their genome. During the viral life cycle viruses manipulate the host cell through interactions with host proteins. Many of these protein–protein interactions are mediated through the recognition of host globular domains by short linear motifs (SLiMs), or longer intrinsically disordered domains (IDD), in the disordered regions of viral proteins. However, viruses also employ their own globular domains for binding to SLiMs and IDDs present in host proteins or virus proteins. In this review, we focus on the different strategies adopted by viruses to utilize proteins or protein domains for binding to the disordered regions of human or/and viral ligands. With a set of examples, we describe viral domains that bind human SLiMs. We also provide examples of viral proteins that bind to SLiMs, or IDDs, of viral proteins as a part of complex assembly and regulation of protein functions. The protein–protein interactions are often crucial for viral replication, and may thus offer possibilities for innovative inhibitor design.
Astrocytes as metabolic suppliers to support neuronal activity and brain functions
Authors: Roumes Hélène , Pellerin Luc , Bouzier-Sore Anne-Karine
Published: December 2022

Energy metabolism is essential for brain function. In recent years, lactate shuttling between astrocytes and neurons has become a fundamental concept of neuroenergetics. However, it remains unclear to what extent this process is critical for different aspects of cognition, their underlying mechanisms, as well as for the signals used to monitor brain activation.
L 363-38 b: A planet newly discovered with ESPRESSO orbiting a nearby M dwarf star
Authors: Sartori Lia F. , Lovis Christophe , Delisle Jean-Baptiste , Lendl Monika , Cugno Gabriele , Boehle Anna , Dannert Felix , Krenn Andreas , Gubler Jonas L. , Quanz Sascha P.
Published: December 2022

Context. Planets around stars in the solar neighbourhood will be prime targets for characterisation with upcoming large space- and ground-based facilities. Since large-scale exoplanet searches will not be feasible with such telescopes, it is crucial to use currently available data and instruments to find possible target planets before next-generation facilities come online.

Aims. We aim to detect new extrasolar planets around stars in the solar neighbourhood via blind radial velocity (RV) searching with ESPRESSO. Our target sample consists of nearby stars (d < 11 pc) with few (<10) or no previous RV measurements.

Methods. We used 31 radial velocity measurements obtained with ESPRESSO at the VLT between December 2020 and February 2022 of the nearby M dwarf star (M★ = 0.21 M⊙, d = 10.23 pc) L 363-38 to derive the orbital parameters of the newly discovered planet. In addition, we used TESS photometry and archival VLT/NaCo high-contrast imaging data to put further constraints on the orbit inclination and the possible planetary system architecture around L 363-38.

Results. We present the detection of a new extrasolar planet orbiting the nearby M dwarf star L 363-38. L 363-38 b is a planet with a minimum mass of mp sin(i) = 4.67 ± 0.43 M⊕ orbiting its star with a period of P = 8.781 ± 0.007 days, corresponding to a semi-major axis of a = 0.048 ± 0.006 AU, which is smaller than the inner edge of the habitable zone. We further estimate a minimum radius of rp sin(i) ≈ 1.55–2.75 R⊕ and an equilibrium temperature of Teq ≈ 330 K.

Conclusions. With this study, we further demonstrate the potential of the state-of-the-art spectrograph ESPRESSO in detecting and investigating planetary systems around nearby M dwarf stars, which were inaccessible to previous instruments such HARPS.
Der Mensch und seine Schmerzen – Möglichkeiten und Grenzen der Erfahrbarkeit der Schmerzen des anderen
Authors: Henß Peter Uwe
Published: December 2022

Der Schmerz nimmt als primum movens für den Arztbesuch, durch seinen diagnostischen Stellenwert und als Indikator für die Therapiewirksamkeit eine zentrale Stellung im Arzt-Patienten-Verhältnis ein.

Die Frage, ob und ggf. wie der Schmerz des anderen erfahrbar ist, hat epistemische Bedeutung. Der Schmerz als Sinneszustand muss vom Schmerz als Bewusstseinsphänomen unterschieden werden.

Qualia werden von Nagel als „what is it like“- Zustände beschrieben, die im phänomenalen Bewusstsein erlebt werden. Sie sind phänomenale Zustände und charakterisiert durch den qualitativen Charakter eines unmittelbar gegebenen subjektiven Gefühlsinhaltes. Der Schmerz als Quale ist subjektiv und an die Erste-Person-Perspektive gebunden. Phänomenale Zustände entziehen sich der begrifflichen Beschreibbarkeit.

Wissenschaftler und Ärzte untersuchen den Schmerz objektiv aus der Dritte-Person-Perspektive. Abstraktion und Objektivierung werden dem subjektiven phänomenalen Schmerzerleben nicht gerecht.

Die Erklärungslücke bei Levine besteht, weil es keinen Nexus zwischen der physischen Reizung einer C-Schmerzfaser und dem Auftreten der phänomenalen Eigenschaft des Schmerzes (Bewusstseinsphänomen) gibt. Nagels Thesen zeigen, dass Tatsachen, die phänomenale Zustände betreffen, keine physikalischen Tatsachen sind. Erstere sind nur Wesen zugänglich, die die geeignete Erfahrungsperspektive einnehmen können.

Der Schmerz des anderen als Quale ist für den Arzt nicht erfahrbar. Medizinische Untersuchungsverfahren in der Medizin sind Surrogate für das Schmerzverständnis, die zugleich für die ärztliche Diagnostik und Therapie unverzichtbar sind

Wiehl postuliert (in der Auseinandersetzung mit Viktor von Weizsäckers Aufsatz „Die Schmerzen“), aufgrund der polaren Struktur des Schmerzes, dass der Schmerz, indem er individuell und spezifisch sei, gerade auch ein allgemeiner Schmerz sei. Wenn in der empathischen Begegnung von Patient und Arzt der Schmerz des anderen mitteilbar wird, könnte durch diesen sprachlichen Annäherungsversuch auf der Seite des Therapeuten modifiziert etwas vom phänomenalen Erleben des Patienten erfahrbar werden.
50 Jahre französisch-schweizerische Studientage – Les Journées d‘Annecy
Authors: Nagel-Brotzler Almut
Published: December 2022

Vom 25.–28.05.2022 fand die Balinttagung von Annecy statt. Gegründet 1972 als französisch-schweizerische Studientagung feierte sie dieses Jahr ihren 50. Geburtstag. In diesem Jahr nahmen 84 Personen aus der Francophonie (Frankreich, Schweiz, Belgien, aber auch Italien und Deutschland teil; die kanadischen Kollegen aus der Provinz Quebec konnten dieses Jahr leider nicht dabei sein).
Methodological challenges and insights for future international business research
Authors: Aguinis Herman , Bergh Donald , Molina-Azorin José F.
Published: December 2022

Given the diverse, interdisciplinary, and multilevel nature of international business (IB) research, it is critical to address methodological challenges prior to data collection. Thus, we suggest that an ounce of methodological prevention is worth a pound of cure. We describe the following challenges: (1) researching an important and relevant issue; (2) making meaningful theoretical progress; (3) recognizing, anticipating, and resolving dilemmas in research design and execution decisions; (4) integrating quantitative and qualitative research by using mixed methods; and (5) reducing the “distal proxy fallacy” through measurement error management. We then offer specific and actionable recommendations and implementation guidelines for authors, journal editors, and reviewers for addressing each of these methodological challenges with the overall goal of advancing IB theory.
Charge-density based evaluation and prediction of stacking fault energies in Ni alloys from DFT and machine learning
Authors: Arora Gaurav , Manzoor Anus , Aidhy Dilpuneet S.
Published: December 2022

A combination of high strength and high ductility has been observed in multi-principal element alloys due to twin formation attributed to low stacking fault energy (SFE). In the pursuit of low SFE alloys, a key bottleneck is the lack of understanding of the composition–SFE correlations that would guide tailoring SFE via alloy composition. Using density functional theory (DFT), we show that dopant radius, which have been postulated as a key descriptor for SFE in dilute alloys, does not fully explain SFE trends across different host metals. Instead, charge density is a much more central descriptor. It allows us to (1) explain contrasting SFE trends in Ni and Cu host metals due to various dopants in dilute concentrations, (2) explain the large SFE variations observed in the literature even within a given alloy composition due to the nearest neighbor environments in “model” concentrated alloys, and (3) develop a machine learning model that can be used to predict SFEs in multi-elemental alloys. This model opens a possibility to use charge density as a descriptor for predicting SFE in alloys.
Effect of interaction strength on recovery downstream of incident shock interactions
Authors: Tong Fulin , Lai Jiang , Duan Junyi , Dong Siwei , Yuan Xianxu , Li Xinliang
Published: December 2022

Direct numerical simulations of a supersonic turbulent boundary layer on a flat plate interacting with an impinging shock wave are carried out with two different incident shock angles at Mach 2.25. The effect of the interaction strength on the recovery process in the downstream region is systematically studied, including the turbulence evolution, the statistical and structural properties of wall pressure fluctuations, and the generation of mean skin friction and wall heat flux. The variations of the Reynolds stress components, the anisotropy tensor, and the turbulent kinetic energy budget in the two flow cases highlight a slow reversal tendency and an increasingly pronounced importance of the outer-layer large-scale structures in the relaxation region of the strong interaction. We find that the effect of increasing the interaction strength on the fluctuating wall pressure is reflected by a decrease in the characteristic frequencies, an increase in the spatial extent, and a decrease in the convection velocity. We decompose the mean skin friction and wall heat flux into different physically informed contributions and reveal that the mean wall heat flux generation is the same regardless of the interaction strength; in contrast, the generation mechanism of mean skin friction is found to be fundamentally changed. A novel scale-decomposition method is used to quantify the effect of the increased interaction strength on the leading components, and it is demonstrated that the energetic outer-layer large-scale structures are the dominant contributor in the recovery process as the interaction strength is increased.
Experiences of overweight and obese patients with diabetes and practice nurses during implementation of a brief weight management intervention in general practice settings serving Culturally and Linguistically Diverse disadvantaged populations
Authors: Govindasamy Sumathi , Beek Kristen , Yates Ken , Jayasuriya Rohan , Reynolds Rebecca , de Wit John B. F. , Harris Mark
Published: December 2022

Background To explore the perspectives of overweight and obese patients with diabetes from culturally and linguistically diverse, and disadvantaged backgrounds, as well as practice nurses (PNs) during implementation of a brief PN-supported self-regulation nutrition strategy for weight management in general practice settings serving disadvantaged populations. Methods During intervention implementation, semi-structured interviews were conducted with 12 patients and four nurses in two general practices located in metropolitan suburbs in Sydney, Australia. Results Patients and PNs found challenges related to cultural expectations and the requirement of patients to set and adhere to dietary change goals and behaviours. Although patients expressed high levels of satisfaction with PNs, the suitability of the intervention to this group was questioned by PNs. Obstacles were also encountered in delivering the intervention in a busy general practice setting. Conclusions This pilot study provided initial evidence of the acceptability of a self-regulation nutrition intervention for weight management for overweight and obese patients with type 2 diabetes that was delivered by PNs. Cultural expectations of provider–patient roles, the type of intervention and flexibility in the workplace are important future considerations.
Health or wealth? The influence of perceived health and wealth threats and style of thinking on protective behaviours and well-being during the COVID-19 pandemic in Spain (¿Salud o riqueza? La influencia de las amenazas percibidas contra la salud y la riqueza y del estilo de pensamiento en las conductas de protección y el bienestar durante la pandemia de COVID-19 en España)
Authors: Carrera Pilar , Aguilar Pilar , Fernández Itziar , Caballero Amparo
Published: December 2022

The present research explored the influence of thinking style and the perception of threats to health and wealth on protective actions and well-being within the framework of the first wave of COVID-19 in Spain. We expected that an abstract (versus concrete) thinking style would be related to greater protective behaviours while maintaining a higher sense of well-being. Through an online questionnaire ( N = 1,043), we explored these relationships and found that the most severe perceived threats to health and wealth and the highest degree of abstraction were associated with the greatest protective behaviours. Importantly, when people did not feel very threatened, those who thought abstractly reported more protective behaviours. Regarding well-being, when people perceived greater threats, those who had an abstract thinking style reported greater well-being. Against the backdrop of the COVID-19 pandemic, the present research provides support indicating that an abstract thinking style is a protective factor against adversities because it is related to protective behaviours and increased well-being even when people perceive severe health and wealth threats.
Search for exotic physics in double-β decays with GERDA Phase II
Authors: Agostini M. , Alexander A. , Araujo G. , Bakalyarov A.M. , Balata M. , Barabanov I. , Baudis L. , Bauer C. , Belogurov S. , Bettini A. , Bezrukov L. , Biancacci V. , Bossio E. , Bothe V. , Brugnera R. , Caldwell A. , Calgaro S. , Cattadori C. , Chernogorov A. , Comellato T. , D'Andrea V. , Demidova E.V. , Di Giacinto A. , Di Marco N. , Doroshkevich E. , Fischer F. , Fomina M. , Gangapshev A. , Garfagnini A. , Gooch C. , Grabmayr P. , Gurentsov V. , Gusev K. , Hakenmüller J. , Hemmer S. , Hofmann W. , Huang J. , Hult M. , Inzhechik L.V. , Janicskó Csáthy J. , Jochum J. , Junker M. , Kazalov V. , Kermaïdic Y. , Khushbakht H. , Kihm T. , Kilgus K. , Kirpichnikov I.V. , Klimenko A. , Knöpfle K.T. , Kochetov O. , Kornoukhov V.N. , Krause P. , Kuzminov V.V. , Laubenstein M. , Lindner M. , Lippi I. , Lubashevskiy A. , Lubsandorzhiev B. , Lutter G. , Macolino C. , Majorovits B. , Maneschg W. , Manzanillas L. , Marshall G. , Miloradovic M. , Mingazheva R. , Misiaszek M. , Morella M. , Müller Y. , Nemchenok I. , Pandola L. , Pelczar K. , Pertoldi L. , Piseri P. , Pullia A. , Ransom C. , Rauscher L. , Redchuk M. , Riboldi S. , Rumyantseva N. , Sada C. , Sailer S. , Salamida F. , Schönert S. , Schreiner J. , Schütt M. , Schütz A-K. , Schulz O. , Schwarz M. , Schwingenheuer B. , Selivanenko O. , Shevchik E. , Shirchenko M. , Shtembari L. , Simgen H. , Smolnikov A. , Stukov D. , Vasenko A.A. , Veresnikova A. , Vignoli C. , von Sturm K. , Wester T. , Wiesinger C. , Wojcik M. , Yanovich E. , Zatschler B. , Zhitnikov I. , Zhukov S.V. , Zinatulina D. , Zschocke A. , Zsigmond A.J. , Zuber K. , Zuzel G.
Published: December 2022

A search for Beyond the Standard Model double-β decay modes of 76Ge has been
performed with data collected during the Phase II of the GERmanium Detector Array 
(Gerda) experiment,
located at the Laboratori
Nazionali del Gran Sasso of INFN (Italy). Improved
limits on the decays involving Majorons have been obtained, compared to previous experiments with 
76Ge, with half-life values on the order of 1023 yr. For the first time with 
76Ge, limits on Lorentz invariance violation effects in double-β decay have been
obtained. The isotropic coefficient åof
(3), which embeds Lorentz
violation in double-β decay, has been constrained at the order of 10-6 GeV. We also
set the first experimental limits on the search for light exotic fermions in double-β decay,
including sterile neutrinos.
A tomographic spherical mass map emulator of the KiDS-1000 survey using conditional generative adversarial networks
Authors: Yiu Timothy Wing Hei , Fluri Janis , Kacprzak Tomasz
Published: December 2022

Large sets of matter density simulations are becoming increasingly important in large-scale structure cosmology. Matter power spectra emulators, such as the Euclid Emulator and
CosmicEmu, are trained on simulations to correct the non-linear part of the power spectrum.
Map-based analyses retrieve additional non-Gaussian information from the density field, whether
through human-designed statistics such as peak counts, or via machine learning methods such as
convolutional neural networks. The simulations required for these methods are very
resource-intensive, both in terms of computing time and storage. This creates a computational
bottleneck for future cosmological analyses, as well as an entry barrier for testing new,
innovative ideas in the area of cosmological information retrieval. Map-level density field
emulators, based on deep generative models, have recently been proposed to address these
challenges. In this work, we present a novel mass map emulator of the KiDS-1000 survey footprint,
which generates noise-free spherical maps in a fraction of a second. It takes a set of
cosmological parameters (Ω
M
, σ
8) as input and produces a consistent set of 5 maps,
corresponding to the KiDS-1000 tomographic redshift bins. To construct the emulator, we use a
conditional generative adversarial network architecture and the spherical convolutional neural
network DeepSphere, and train it on N-body-simulated mass maps. We compare its
performance using an array of quantitative comparison metrics: angular power spectra Cℓ
,
pixel/peaks distributions, Cℓ
correlation matrices, and Structural Similarity Index.
Overall, the average agreement on these summary statistics is <10% for the cosmologies at the
centre of the simulation grid, and degrades slightly on grid edges. However, the quality of the
generated maps is worse at high negative κ values or large scale, which can significantly
affect summaries sensitive to such observables. Finally, we perform a mock cosmological parameter
estimation using the emulator and the original simulation set. We find good agreement in these
constraints, for both likelihood and likelihood-free approaches. The emulator is available at
tfhub.dev/cosmo-group-ethz/models/kids-cgan.
Statistical properties of inflationary saddles in Gaussian random landscapes
Authors: Low Lerh Feng , Easther Richard , Hotchkiss Shaun
Published: December 2022

Random, multifield functions can set generic expectations for landscape-style cosmologies. We consider the inflationary implications of a landscape defined by a Gaussian random function, which is perhaps the simplest such scenario. Many key properties of this landscape, including the distribution of saddles as a function of height in the potential, depend only on its dimensionality, N, and a single parameter, γ, which is set by the power spectrum of the random function. We show that for saddles with a single downhill direction the negative mass term grows smaller relative to the average mass as N increases, a result with potential implications for the η-problem in landscape scenarios. For some power spectra, Planck-scale saddles have η ∼ 1 and eternal, topological inflation would be common in these scenarios. Lower-lying saddles typically have large η, but the fraction of these saddles which would support inflation is computable, allowing us to identify which scenarios can deliver a universe that resembles ours. Finally, by drawing inferences about the relative viability of different multiverse proposals we also illustrate ways in which quantitative analyses of multiverse scenarios are feasible.
The effect of outflows on CMB bounds from Primordial Black Hole accretion
Authors: Piga Lorenzo , Lucca Matteo , Bellomo Nicola , Bosch-Ramon Valentí , Matarrese Sabino , Raccanelli Alvise , Verde Licia
Published: December 2022

Should Primordial Black Holes (PBHs) exist in nature, they would inevitably accrete baryonic matter in their vicinity. In turn, the consequent emission of high-energy radiation could affect the thermal history of the universe to an extent that can be probed with a number of cosmological observables such as the Cosmic Microwave Background (CMB) anisotropies. However, our understanding of the accretion and radiation emission processes in the context of PBHs is still in its infancy, and very large theoretical uncertainties affect the resulting constraints on the PBH abundance. Building on state-of-the-art literature, in this work we take a step towards the development of a more realistic picture of PBH accretion by accounting for the contribution of outflows. Specifically, we derive CMB-driven constraints on the PBH abundance for various accretion geometries, ionization models and mass distributions in absence and in presence of mechanical feedback and non-thermal emissions due to the outflows. As a result, we show that the presence of such outflows introduces an additional layer of uncertainty that needs to be taken into account when quoting cosmological constraints on the PBH abundance, with important consequences in particular in the LIGO-Virgo-KAGRA observational window.
WIMPs during reheating
Authors: Bernal Nicolás , Xu Yong
Published: December 2022

Weakly Interacting Massive Particles (WIMPs) are among the best-motivated dark matter candidates. In the standard scenario where the freeze-out happens well after the end of inflationary reheating, they are in tension with the severe experimental constraints. Here, we investigate the thermal freeze-out of WIMPs occurring during reheating, while the inflaton ϕ coherently oscillates in a generic potential ∝ ϕn
. Depending on the value of n and the spin of the inflaton decaying products, the evolution of the radiation and inflaton energy densities can show distinct features, therefore, having a considerable impact on the freeze-out behavior of WIMPs. As a result of the injection of entropy during reheating, the parameter space compatible with the observed DM relic abundance is enlarged. In particular, the WIMP thermally averaged annihilation cross-section can be several magnitudes lower than that in the standard case. Finally, we discuss the current bounds from dark matter indirect detection experiments, and explore future challenges and opportunities.
The impact of gravitational lensing in the reconstruction of stellar orbits around Sgr A*
Authors: Pietroni S. , Bozza V.
Published: December 2022

After the amazing discoveries by the GRAVITY collaboration in the last few years on the star S2 orbiting the black hole Sgr A* in the center of the Milky Way, we present a detailed investigation of the impact of gravitational lensing on the reconstruction of stellar orbits around this massive black hole.
We evaluate the lensing astrometric effects on the stars S2, S38 and S55 and how these systematically affect the derived orbital parameters. The effect is below current uncertainties, but not negligible. With the addition of more observations on these stars, it will be possible to let the astrometric shift by lensing emerge from the statistical noise and be finally detected.

By repeating the analysis on a smaller semimajor axis a and various inclinations i, we are able to quantify the lensing effects on a broader range of parameters. As expected, for smaller semimajor axes and for nearly edge-on orbits lensing effects increase by about an order of magnitude.
Phonon-phonon interaction and parametric down-conversion generation in multimode optomechanical systems
Authors: Peng Zhen-Yang , Wang Ying-Dan
Published: December 2022

We studied the process of polariton conversion in a 3-mode nonlinear optomechanical system. Compared with the standard 2-mode optomechanical system, we find a much larger conversion rate of polariton modes can be achieved under typical dissipation conditions. To obtain a transparent understanding of the relevant physical process, we show that in the large detuned case, the cavity can be eliminated adiabatically, resulting in a parametric down-conversion (PDC) interaction between two phononic polariton modes. By tuning cavity detuning, the nonlinear interaction can be enhanced with the frequency-matching condition. Results from analytical treatment based on the effective PDC model agree with the numerical simulation. Such a system provides potential applications in nonlinear phononics.
Optimal Design of a Novel Piezoelectric Vibration Energy Harvester
Authors: Feng Yiting , Liu Wenguang
Published: December 2022

A novel piezoelectric vibration energy harvester structure is designed. The output voltage is employed as the objective function, and the structural parameters of the vibration energy harvester device are optimized by Taguchi method. The best parameter combination of A3(95mm), B3(45mm), C1(60mm), D2(35mm) and E1(50mm) is determined. Through the analysis of variance, it is concluded that parameter A has the most obvious effect on the response of the piezoelectric energy harvester, with the contribution rate reaching 26.02%, and the influences of B, C, D and E decrease successively. The finite element model of the piezoelectric vibration energy harvester is established, then the load impedance matching characteristics and acceleration dependence of voltage are discussed.
Study of contact load on cycloid wheel of RV reducer based on MATLAB
Authors: Zhao Zihang , Zhang Qing
Published: December 2022

This paper analyses the working principle of RV reducer and the actual tooth profile equation of cycloid wheel, and deduces the distribution law of contact load on cycloid wheel in transient state by considering the initial meshing gap between pin teeth and cycloid wheel and the contact deformation generated during meshing. Taking an RV reducer as the research object, the contact load of the cycloid wheel is calculated by using MATLAB programming, and the change curve of contact load and crank shaft rotation angle is obtained, which provides theoretical support for the analysis and design of RV reducer.
Optimal design of the heat-sealing structure of the sealing machine based on SOLIDWORKS Simulation
Authors: Wang Kui , Wu Jianjun , Liu Qiang
Published: December 2022

In order to optimize the sealing machine, this paper takes the heat sealing block in the heat sealing structure of the sealing machine as the research object, and improves the working efficiency and stability of the sealing machine by changing the size and structure of the heat sealing block. The 3D modeling of the sealing machine was carried out by using SOLIDWORKS; then the reliability of the simulation in this paper was verified by comparing the experimental data and the simulation data; finally, the comparison of the simulation data of the heat sealing block before and after the modification found that the modification of the heat sealing block reduced the heating time by 7.5 s , the variance value is reduced by 96.8%, and the uniformity of heat distribution is significantly improved.
Error Analysis of Precision Testing Device for Precision Reducer
Authors: Wang Bangqiang , Li Rongda , Zhang Qing
Published: December 2022

Precision reducers used in aerospace servo mechanisms often have the characteristics of high accuracy and strong bearing capacity due to the particularity of their working environment. Transmission error, as an important parameter affecting the accuracy of precision reducer, is different from ordinary reducers, and often requires that its maximum transmission error can be effectively controlled within 3’. In order to efficiently test the accuracy of the reducer, this paper designed a set of test devices for the accuracy measurement of the reducer of the aerospace servo mechanism, and now conducts a systematic error analysis of the overall test device, determines the error range, and finally, the uncertainty is integrated to confirm that the error meets the design requirements.
Topology optimization of robotic arm for gas drainage pipeline installation
Authors: Song Xinke , Chen Demin , Qu Baohua
Published: December 2022

By means of finite element analysis and topology optimization methods, the structural optimization and lightweight design of the robotic arm for the installation of gas drainage pipelines are realized, so that it can realize more complex actions under the premise of ensuring stability. SolidWorks 3D modeling and Ansys Workbench analysis software are used to build models of the robotic arm and perform static analysis. The structural design is optimized through the deformation and stress distribution when grasping the maximum weight. The topology optimization mathematical model of the variable density method and the SIMP (Simplified Isotropic Material with Penalization) interpolation model was constructed, and the topology optimization of the robotic arm was performed in the Shape Optimization module in Ansys Workbench. On this basis, the structure after topology optimization is analyzed and studied. The results show that compared with before topology optimization, the mass of the manipulator is reduced by 29.65%, and the maximum deformation and maximum stress are both reduced by 10%, which confirms the feasibility of lightweight design and structural optimization of the manipulator.
Optimal design of double-link trapezoidal boom suspension for high gap self-propelled sprayer based on ANSYS
Authors: Liu Changxi , Hu Jun , Yu Zhaonan , Li Yufei , Zhang Wei
Published: December 2022

The high gap self-propelled sprayer has the characteristics of wide boom width and high working efficiency. Aiming at the problem that the spray boom is prone to mechanical vibration along with the body and affects the spraying effect, the static analysis and modal analysis of the boom suspension of its two-link trapezoidal mechanism are carried out, based on the ANSYS simulation method. The results show that the optimized stress at the end boom suspension connection is reduced from 161MPa to 22MPa, and the maximum displacement is reduced from 35mm to 7mm. The maximum stress of the inner boom suspension was reduced from 128.36MPa to 88.07MPa Stress distribution and displacement conditions achieve the desired effect. The modal analysis results show that the first six natural frequencies of the boom suspension do not coincide. And this frequency reasonably avoids the external excitation frequency range, and avoids unnecessary damage caused by the resonance of the boom suspension in the actual operation of the sprayer.
Characteristics of internal flow field and convection heat transfer in planetary gear reducer of shield machine
Authors: Xiang Yuhao , Lin Tengjiao , Liu Wen
Published: December 2022

Based on RNG k-ε turbulence model and dynamic grid technology, the internal fluid dynamics model of splash lubrication three stage planetary gear reducer system is established. The distribution of lubricating oil and convective heat transfer characteristic in the system at different input rotational speeds are analyzed. The results show that at high speed condition, the oil gas mixing volume and the degree of atomization of lubricating oil are higher, and the convective heat transfer coefficient of tooth surface is larger, and it takes less time for the convective heat transfer coefficient to reach equilibrium. Meanwhile, the mean convective heat transfer coefficient on the tooth surface of sun gear, planetary gear and ring gear decreases successively.
Analysis of flexible air bearing and design of testing machine
Authors: Bai Yujian , Wang Wen , Li Baofu
Published: December 2022

The paper takes a type of flexible air bearing as the research object, and the bearing structure is analyzed in detail. Combined with the traditional analysis method of tilting pad bearing and the fluid-solid coupling theory, a new analysis model for performance prediction of the bearing was established. The performance of air bearing with inner diameter of 70mm was calculated by changing the input pressure or the inlet capillary diameter. The structure of the bearing was optimized by analyzing the calculation results, and the structure of the separate inlet nozzle was added. A bearing testing machine is designed for the flexible air bearing test to verify the improvement of bearing performance.
Design of starting motor test-bed for vehicle
Authors: Shi Yuejun , Dong Jinzhao , Li Qinghang , Zheng Qian
Published: December 2022

In this paper, magnetic powder brake is used to load the starting motor in the design of the test bed, so that the loading and transmission is stable and reliable. The star type elastic coupling is used to connect the starting motor and reduce the vibration and noise. At the same time, high precision speed and torque sensor is used to improve the accuracy of the speed and torque data testing of the starting motor. After the test, the test report can be generated automatically and the test data can be stored. The reliability of design and simulation calculation is verified by debugging and continuous operation of the test bed, which provides an effective experimental basis for the design and research of similar products.
Design of 3D-printed metal micro-truss porous configurations with geometric inhomogeneity
Authors: Liu Sufan , Li Bo
Published: December 2022

The metal micro-truss porous structures demonstrate industrial application values in lightweight, high specific strength, impact resistance and energy absorption. 3D printing brings a feasible path to design and directly fabricate metal micro-truss parts. Spatially geometrically uniformly distributed and unit-symmetrically arrayed porous structures still need to further improve the structural performance. This work studies the design principles and several design cases of geometrically non-uniform micro-truss porous structures via metal 3D printing method. The high-stress localized micro-regions are filled with denser and more reinforced micro-truss cell arrays that conform to the main loading direction of localized stress.
Design of Multi-Station Progressive Die for Mounting Bracket of Automobile Front Bumper Spotlight
Authors: Zhang Huiju , Li Chunhui
Published: December 2022

The mounting bracket of the front bumper spotlight of the automobile is mainly produced by the method of wire cutting and processing. This method is difficult to achieve mass production and the performance becomes poor after processing. In order to improve this phenomenon, this paper adopts the method of sheet metal stamping to form it. The main tasks include the determination of the process plan, the simulation of Dynaform 5.9, the design of the layout, the calculation of the punching force, the bending force and the design of a set of 7-station progressive die. This design has certain practical guiding significance for the processing of the same type of products.
Design, molding, manufacturing and testing of wave-transparent functional composite missile wings
Authors: Jiang Ming , Shen Feng , Guo Jinhai , Dong Bin , Wang Guanghui , Zhang Guangjun
Published: December 2022

In this paper, a fiber-reinforced resin matrix composite missile wing with a wave-transparent function is studied, which has the function of wave-transparent and meets the requirements of the mechanical properties of the missile during flight, and the missile wing structure is made of aluminum alloy, carbon fiber composite material, and glass fiber composite material, and the weight reduction is about 30.3% compared with the overall aluminum alloy structure of the missile wing. In the design process, the finite element simulation method is used, the plastic deformation of aluminum alloy is fully considered, and the antenna is built into the airfoil of glass fiber composite material, which successfully realizes the wave-transparent function of the missile wing and provides a new design idea for the composite wing.
Numerical simulation of pipeline crack detection probe with poly-magnetic structure
Authors: Xin Jiaxing , Zhang Weiwen , Lu Run-kun , Chen Jinzhong , Zhu Hongwu , He Renyang
Published: December 2022

The detection and characterization of cracks is one of the key issues in oil and gas transmission pipeline inspection. The weak degree of spatial magnetic field distortion caused by the small size of the crack creates great difficulties for signal extraction. In this paper, we propose an ACM crack detection probe with poly-magnetic structure, and investigate the influence of the core, shield on the detection signal through numerical simulations. The results show that the crack detection probe with the core and shield can effectively improve the distorted magnetic field component in space acquired by the magnetic element, increasing the distorted magnetic field signals in the vertical and horizontal directions by a factor of 2.10 and 1.76 respectively. Verification that ACM probe with poly-magnetic structure can effectively increases the crack-induced magnetic field distortion signal and reduce the probability of misses.
Research and Design of Photoelectric Converter for Quantum Gravimeter
Authors: Zhu Mingda , Liu Xiaoxin , Wang Yaping , Bi Jianhua , Xu Yudong , Zhu Yingcong
Published: December 2022

In the control system of a quantum gravimeter, the optical signal containing phase information is weak and usually at the nV level. This situation puts forward high requirements for the measurement performance of the system. As the coupling input component of the measurement system, the noise level of the preamplifier has a dramatic influence on the noise performance. In this paper, the input current signal is provided by the photodiode. According to the photodiode output characteristics, we design three preamplifiers with different gain and bandwidth, which is verified by the optical system. Under the condition of meeting the design requirements, the noise performance is compared with the common commercial detector Model 2307. The results show that the noise performance of the photoelectric converter designed in this paper is about 1.5 times that of model 2307.
Hybrid manufacturing by 3D printing: A facile route to fabricate high-performance complex parts of low-fluidity high-entropy alloys
Authors: Li Yingmin , Li Yunkai , Zhu Yichao , Xiao Yao , Liang Yao-Jian , Xue Yunfei , Wang Lu
Published: December 2022

For low-fluidity alloys such as TiNb-rich high-entropy alloys, casting parts with complex geometry normally encounter the forming problems like incomplete filling, shrinkage cavities and porosity. Additive manufacturing (AM) is suitable for fabricating those complex parts. However, for the regular portion of a complex part such as the disc of an impeller, AM is not a cost-optimal choice. This work proposes a facile route to fabricate high-performance parts with complex geometry, in which the portion with regular geometry is cast whereas the complex portion that requires high performance is additively manufactured. The results show that the failure always occurs in the cast portion of the hybrid manufactured sample rather than at the interface between the AM portion and the cast one. The strong interfacial bonding is quite different from the welding joint which is commonly the weak link. Moreover, compared with the cast portion with coarse equiaxed grains, the equiaxed fine-grained AM portion exhibits higher strength without sacrificing ductility. Hybrid manufacturing does not introduce weakness, but rather can strengthen the targeted portion by a reasonable structural design.
Microtab for performance improvement on a vertical-axis wind turbine at high tip-speed-ratios
Authors: Ma Wenlong , Wang Hanxiang , Yu Hongdong , Mi Yuxia , Zhang Lijun
Published: December 2022

In this study, the effect of microtab (MT) with different deployed positions and heights on the performance of a vertical-axis wind turbine (VAWT) is investigated through two-dimensional CFD simulation. The simulation results show that optimum deployed position for better turbine performance is 96% of chord from leading edge and optimum height is 0.5% of chord, which makes the power coefficient of turbine increase by 13% at TSR = 3.2. The observation of flow fields around turbine blade with MT indicates that MT decreases area of stall region at azimuthal angles ranging from 90° to 270°, leading to the increase of pressure and torque of turbine blade. The simulated results demonstrate that MT is an effective solution to enhance flow characteristics around turbine blade and improve turbine performance at high tip-speed-ratios.
Research on surplus wind power consumption mechanism based on grid demand response
Authors: Liu Shuang , Zhao Lihong
Published: December 2022

A method of using the demand response mechanism of the power grid to promote the consumption of surplus wind power is proposed for the consumption of new energy generation. In the proposed method, the replacement of the output of the gas turbine is used as an important way to consume the surplus power, and the consumption of the surplus wind power is realized by using the surplus wind power to replace part of the output of the gas turbine. With the objective function of the maximum consumable surplus wind power and the constraints of the maximum replaceable output of the gas turbine, the cost of the replacement output and the balance of supply and demand of the grid, a model of the maximum consumable surplus wind power considering the cost of the replacement output is constructed. In addition, a cost optimal allocation model considering the different quotations of surplus wind power resource owners is constructed to obtain the optimal surplus power resource consumption scheme.
Fault feature extraction and recognition of vibration signal based on CWD-SK and HMM
Authors: Cai Fan , Zhu Tongbo
Published: December 2022

Aiming at the problem of rolling bearing fault diagnosis caused by interference information in the process of vibration transmission, this paper puts forward the theory and method of vibration signal fault diagnosis based on Choi Williams distribution spectral kurtosis (SK) combined with hidden Markov model (HMM). The fault location method of local mean decomposition (LMD) is used to screen the PF component with obvious fault characteristic information, CWD-SK is calculated and set as the characteristic parameter to realize the feature extraction of the initial fault of the vibration signal. CWD-SK is input into HMM as the feature vector to classify and identify the fault features of the vibration signal. Finally, the effectiveness of the algorithm is verified by the simulation of the actual data. It provides a robust theoretical and methodological basis for the establishment of fault diagnosis and classification recognition technology suitable for initial rolling mechanical vibration signals.