bluuebunny/crossref_metadata_2025 huggingface dataset:
Studies on Chemical Constituents of Radix Angelicae pubescentis
Authors: Zhu Yan , Feng Jiao , Liu QingYang , Yang Songsong
Published: May 2023

Backgound:Angelicae pubescentis is the root of Angelica pubescens Maxim. f. biserrata Shan et Yuan. The main active ingredients are coumarin and volatile oil, and it has a variety of pharmacological activities such as antibacterial, antioxidant and anti-inflammatory. In this paper, the active components of the CO2 supercritical extract of Angelicae pubescentis were studied. The results of this study will provide a scientific basis for the study of the chemical composition of Angelicae pubescentis. Purpose: To study the chemical constituents of supercritical extract of Radix Angelicae pubescentis. Method: The supercritical extract of Radix Angelicae pubescentis was separated by silica gel column chromatography to obtain monomers. The structures were identified based on physicochemical properties and spectroscopic data. Result: Eight compounds were separated from the supercritical extract of Radix Angelicae pubescentis, six of which were identified.They are Osthol, Columbianedin, Columbianetin, Columbianetin Acetate, Xanthotoxin and Bergapten. Conclusion: Xanthotoxin and Bergapten were isolated, which structure were similar. The standard substance of Osthol and Columbianedin were producted in order to offer the good material base for quality evaluation and pharmacodynamic study of Radix Angelicae pubescentis. Their purification were more than 99%. The results of this study are of great significance for exploring the effective material basis and medicinal value of the supercritical extract of Radix Angelicae pubescentis.
Preparation of calcium oxide by decomposition of phosphogypsum under CO and water vapor atmosphere
Authors: Ma Dong , Wang Qinhui
Published: May 2023

Phosphogypsum (PG) is an industrial solid waste, and the production of CaO by CO reduction of PG can not only solve the environmental problems caused by PG, but also turn waste into treasure to generate CaO. However, the current yield of CaO production by CO reduction of PG is low. To further improve the yield of CaO, a technical method of CaO preparation by CO-H2O synergistic reduction of PG is proposed. The impacts of CO concentration, P(H2O)/P(CO) ratio and reaction temperature are examined in this work together with FactSage thermodynamic simulations in order to determine the ideal reaction conditions and reaction mechanism. It is found that the CaO yield could reach 96.78% at 1100 °C of 3% CO and P(H2O)/P(CO) of 10. The mechanism study shows that when the CO atmosphere contains H2O, the reductive decomposition of PG by CO is actually the result of the joint action of CO, H2 and CO2. Overall, this research will help to enhance a novel technological strategy for preparing CaO by decomposition of PG.
Research on the progress of hydrogen storage technology and its commercialization path
Authors: Yuan Zhuokai
Published: May 2023

Nowadays, global warming and energy scarcity have prompted mankind to develop new energy technologies. Given that new energy generation technologies such as solar and wind energy are subject to climatic conditions with factors such as unstable power generation, the storage process of electrical energy is particularly important. Therefore, the importance of hydrogen energy and its storage technology has received increasing attention from researchers based on the advantages of its wide distribution, high calorific value, and lack of greenhouse gas production.This paper summarizes the current research status of various hydrogen storage technologies, and at the same time assesses and compares the gap between each hydrogen storage technology and the commercialization standard. Based on the analysis, two key routes for the future development of hydrogen storage technologies are proposed.
Research Progress on the Chemical Constituents and Quality Evaluation Methods of Spina gleditsiae
Authors: Liu Xiaojuan
Published: May 2023

In this paper, the relevant information on chemical constituents and quality evaluation of Spina gleditsiae were retrieved and summarized. Modern studies show that Spina gleditsiae mainly contains flavonoids, phenols, triterpenoids, coumarins, sterols, lactones, organic acids and other compounds. Then the quality evaluation methods of Spina gleditsiae were introduced. In the future research, it is necessary to explore the extraction and separation technology of its chemical constituents and active constituents, and establish appropriate models to promote its development and application. It provides a reference for the further establishment of scientific and reasonable studies on the effective components of Spina gleditsiae.
Preparation of flower-like hydrogel and its application in sea water desalination
Authors: Fang Jingkang , Xia Mengsheng , Li Yule , Gao Junkai
Published: May 2023

The situation of global water crisis is becoming more and more serious[1]. Due to the inconvenience of fresh water carrying or long-term storage and deterioration, the personnel and equipment of oceangoing ships are in urgent need of fresh water resources[2]. However, the traditional seawater desalination technology will consume fossil energy or its economy is not high. Under the background of a series of green ship development plans, people focus on green clean energy to solve the problem of fresh water shortage[3]. Interfacial photoevaporation is an effective strategy to promote seawater desalination and pollutant treatment. Photothermal conversion materials and evaporators have shown their good performance in improving seawater desalination efficiency. In this paper, the photohot water gel prepared by calcium chloride, polyvinyl alcohol, sodium citrate, tannic acid and ferric chloride was used as the photothermal conversion material[4]. The properties of photoevaporative seawater desalination materials were studied by a series of instruments such as optical microscope and contact Angle measuring instrument. The experimental results show that the flower-like hydrogel has high photothermal conversion efficiency and has a good application prospect in green Marine desalination field.
Experimental Study on Desulfurization of Zinc Oxide
Authors: Zhonghui Zhang , Yong-hui LI
Published: May 2023

Sulfur dioxide can be eliminated by zinc oxide dust. The process conditions for the direct absorption of sulfur dioxide by the slurry were discussed in this paper. The influence of the variables like the ratio of liquid to liquid, the ratio of liquid to gas, the concentration of SO2 gas, and the gas velocity on the desulfurization efficiency were investigated. The desulfurization effect of using high-efficiency atomizing nozzle is better than that of vortex nozzle. As the solid content of zinc oxide slurry reaches above 45%, the rate of increase of desulfurization efficiency becomes lower, and even a decreasing trend appears at the later stage.
Preparation and characterization of AgNPs@SNC nanocomposites
Authors: Zhu Jiang , Ni Haitao , Luo Liu , Yang Heshan
Published: May 2023

Starch nanocrystal (SNC) was prepared by 40°C weak sulfuric acid hydrolysis method. Silver nanoparticles (AgNPs) were simply and quickly reduced in situ on starch nanocrystal by ultrasonic assisted reduction method. UV-vis absorption spectrum verified the existence of AgNPs. The surface modification of AgNPs@SNC was carried out by using 3-aminopropyltriethoxysilane (APTES) with simple structure and low cost to improve its dispersivity in the hydrophobic polymer matrix. Then the success of modification was preliminarily confirmed by the Fourier-transform infrared spectroscopy. Taking Staphylococcus aureus and Escherichia coli bacteria as objects of the study, the antibacterial properties of AgNPs@SNC were also explored, and the test results showed that AgNPs@SNC had certain inhibitory effect on Escherichia coli.
Research progress on degradation of organic pollutants based on metal–organic frameworks materials
Authors: Du Zhehua
Published: May 2023

As an advanced oxidation process, Fenton oxidation has attracted much attention because its reactants and products are green and pollution - free. The traditional Fenton oxidation method has some problems, such as high PH requirement and low utilization rate of hydrogen peroxide. Over the past few years, the advancements in application research of Metal-Organic Frameworks (MOFs) have presented innovative and effective ideas for addressing the aforementioned issues. This paper presents the recent advancements in Fenton oxidation technique utilizing Fenton-based materials. Based on literature analysis, it can be seen that Fe-based MOFs were initially used for catalytic reaction and the research shows that the catalytic activity of Fe-based MOFs can be increased by increasing the number of unsaturated Fe metal sites. And the doping of other metals into Fe-based MOF or dual ligand Fe-based MOFs can play a role in changing the structure and increasing the unsaturated metal sites which can further expand the direct application of MOFs in the Fenton oxidation method. However, due to the limited types of iron-based MOFs, non-iron-based MOFs materials and indirect use of MOFs have been reported in the indirect use of MOFs, catalytic active substances can be compounded into MOFs materials through in-situ growth, forming a synergistic effect to improve the efficiency of degradation by means of carbonization or pyrolysis of MOFs, MOFs derived materials can be obtained.
A conservative network element method for diffusion-advection-reaction problems
Authors: Coatléven Julien
Published: May 2023

We derive a conservative network element method for heterogeneous and anisotropic diffusion problems by modifying the non-conservative version, and extend it to the approximation of an additional advection term. The numerical scheme possesses the flux formulation reminiscent of classical finite volume methods. Its convergence is naturally governed by the network element theory. Numerical results illustrate the good behavior of the method even on distorted point clouds.
Direkt gedruckte Aligner – der heilige Gral in der
Kieferorthopädie?
Authors: Graf Simon
Published: May 2023

Direkt gedruckte Aligner! Um diesen Begriff kommt man in der
Kieferorthopädie fast nicht mehr herum. Doch was bedeutet er, und was
bedeutet er für den Kieferorthopäden und seine Patienten? In
diesem Artikel beleuchtet das Potential von Behandlungsmöglichkeiten der
direkt gedruckten Aligner. Viele bestehende Schwierigkeiten in der
Schienentherapie können durch die Vielseitigkeit der druckbaren Elemente
auf den Schienen behoben oder wenigstens reduziert werden.
Applikation einer Teilbogenmechanik zur Einordnung palatinal
verlagerter oberer Eckzähne
Authors: Pauls Alexander
Published: May 2023

Durch die Anwendung von Teilbogenmechaniken zur Einordnung verlagerter
Eckzähne kann nicht nur eine genaue Definition der Kräfte und
der Zugrichtung erfolgen, sondern zusätzlich die Anwendungszeit
festsitzender Multibracketapparaturen deutlich reduziert werden. Die hier
demonstrierte Befestigungsmethode für palatinale Teilbogenmechaniken
stellt eine einfach zu inserierende, zeit- und kostensparende Methode dar,
sofern Bänder mit Hooks an den Palatinalschlössern verwendet
werden.
Prevention and Therapy of Preterm Birth. Guideline of the DGGG, OEGGG and SGGG (S2k Level, AWMF Registry Number 015/025, September 2022) – Part 2 with Recommendations
on the Tertiary Prevention of Preterm Birth and on the Management of Preterm Premature Rupture of Membranes
Authors: Berger Richard , Abele Harald , Bahlmann Franz , Doubek Klaus , Felderhoff-Müser Ursula , Fluhr Herbert , Garnier Yves , Grylka-Baeschlin Susanne , Hayward Aurelia , Helmer Hanns , Herting Egbert , Hoopmann Markus , Hösli Irene , Hoyme Udo , Kunze Mirjam , Kuon Ruben-H. , Kyvernitakis Ioannis , Lütje Wolf , Mader Silke , Maul Holger , Mendling Werner , Mitschdörfer Barbara , Nothacker Monika , Olbertz Dirk , Ramsell Andrea , Rath Werner , Roll Claudia , Schlembach Dietmar , Schleußner Ekkehard , Schütz Florian , Seifert-Klauss Vanadin , Stubert Johannes , Surbek Daniel
Published: May 2023

Aim The revision of this guideline was coordinated by the German Society for Gynecology and Obstetrics (DGGG), the Austrian Society for Gynecology and Obstetrics (OEGGG) and the
Swiss Society for Gynecology and Obstetrics (SGGG). The aim of the guideline is to improve the prediction, prevention and management of preterm birth based on evidence from the current
literature, the experience of members of the guidelines commission, and the viewpoint of self-help organizations.

Methods The members of the contributing professional societies and organizations developed recommendations and statements based on international literature. The recommendations and
statements were presented and adopted using a formal process (structured consensus conferences with neutral moderation, written Delphi vote).

Recommendations Part 2 of this short version of the guideline presents statements and recommendations on the tertiary prevention of preterm birth and the management of preterm
premature rupture of membranes.
Early Outcomes in Targeted Muscle Reinnervation for Traumatic Amputations
Authors: Denton Stephen R. , McBride Conor , Hammond Alexander P. , LoGiudice Anthony J.
Published: May 2023

Background Traumatic amputees commonly experience residual limb pain (RLP) and phantom limb pain (PLP) which present major barriers to rehabilitation. An evolving treatment, targeted muscle reinnervation (TMR), shows promise in reducing these symptoms. While initial data are encouraging, existing studies are low power, and more research is needed to assess the long-term outcomes of TMR. We present the results of self-reported outcome surveys distributed to major-limb amputees more than 1 year post-TMR which were compared with similar data from a landmark randomized control trial for context.

Methods Data was obtained from 17 adult traumatic amputees who were more than 1 year post-TMR using a numerical rating scale and the Patient-Reported Outcomes Measurement Information System survey tool. Results were compared with a 2019 randomized control trial by Dumanian et al which assessed TMR versus standard care (SC) after major limb amputation and demonstrated improvement in pain scores 1 year post-TMR.

Results There was a statistically significant reduction in this cohort of TMR amputees' RLP worst pain scores relative to the comparison study's SC amputees (without TMR). In general, there was no significant difference in outcomes between TMR cohorts. However, PLP worst pain was significantly higher in this cohort relative to the comparison study's TMR group.

Conclusion These findings support the use of TMR for reducing RLP in traumatic amputees. Relative to a similar group treated without TMR in the comparison study, this cohort's RLP was significantly improved. Future studies should aim to recruit more amputees to allow for analysis of functional outcomes, especially in upper limb amputees.
DIEP Flap Transplantation in Monozygotic Twins for Breast Reconstruction: A Case Report and Literature Review
Authors: Ozturk Cemile Nurdan , Manisundaram Arvind D. , Rivera Mariangela , Ozturk Can , Moon Wong
Published: May 2023

Background Composite tissue allotransplants are performed for various defects when local, or distant reconstructive options are limited. Though this type of transplant replaces similar tissue, it is complicated by immunosuppression. This limitation may be avoided in monozygotic twins since they share identical genetic code. Free soft tissue transplantation across identical twins has been reported for breast, scalp, and thoracic reconstruction when autologous tissues were insufficient. We present a case of a successful deep inferior epigastric artery perforator (DIEP) flap transplantation in monozygotic twins.

Methods The recipient twin was a patient with history of breast cancer and failed prosthetic reconstruction. She desired autologous reconstruction with a DIEP flap but had insufficient donor tissue. She refused alternative sites; however, she had an identical twin willing to donate her excess abdominal tissue. The twins underwent deoxyribonucleic acid testing, human leukocyte antigen/blood type testing, and screening for communicable diseases.

Results The twins were found to have greater than 99.99% probability of being monozygotic twins. A bipedicled conjoined DIEP was harvested from donor twin and transplanted to recipient twin. Immunosuppressive regimen was not utilized. Patients healed uneventfully and are currently 5 years postop without long-term complications.

Conclusion Isogeneic flap transplant is a viable option to consider when autologous tissues are restricted, and monozygotic twins are present. Appropriate counseling of twins is critical for a successful and satisfactory outcome.
Homoeopathic Treatment of Chocolate Cyst: A Case Report
Authors: Mahajan Priyanka S. , Tayade Kanchan R.
Published: May 2023

Chocolate cysts of the ovary come under the subgroup of endometriosis. The prevalence of chocolate cyst in the reproductive age group is 8% and in the postmenopausal age group, 18%. Its defining symptoms include dyspareunia, pelvic pain, irregular periods and menstrual pain. A cyst size of more than 4 cm indicates the need for surgical treatment. The typical therapies for this condition include hormone therapy and operations like hysterectomy. In this case report, we have shown a positive curative role of homeopathic medicine in the management of chocolate cyst of the ovary. A 31-year-old woman complaining of weakness came to the OPD, painful irregular menses with large clots and stitching pain in the right inguinal region. She was diagnosed with chocolate cyst of the ovary. She had been on hormonal therapy for a year without any relief, and the USG report showed that the cyst had grown bigger. The patient was treated successfully with individualised homoeopathic medicine Lachesis in centesimal potency, which showed significant improvement in patient – and post-treatment outcome was corroborated with follow-up and laboratory investigation which showed complete regression of cyst. Causal attribution for changes in the condition of patient after homoeopathic medication was assessed by modified Naranjo criteria.
Imaging Recommendations for Diagnosis, Staging, and Management of Peritoneal Malignancies
Authors: Choudhari Amit Kumar , Chandramohan Anuradha , Shetty Nitin , Kulkarni Suyash , Shrikhande Shailesh , Saklani Avanish , Mittal Rohin , Deodhar Kedar , Yadav Subhash , Engineer Reena , Ostwal Vikas , Patil Prachi
Published: May 2023

Peritoneum is a serosal membrane lining the solid viscera and the hollow viscus of the abdomen and is made of a single layer of mesothelial cells. The most common primaries that spread to the peritoneum include gastrointestinal, ovarian, colorectal, and peritoneal metastases can be seen at some point during the disease course in 15 to 43%, 60 to 70% and 15 to 20% of patients, respectively. Other malignancies involving the peritoneum such as primary peritoneal carcinoma, peritoneal mesothelioma, peritoneal lymphomatosis, pseudomyxoma peritonei from low-grade appendiceal mucinous neoplasm, are far less common. The review strives to provide a framework for diagnosis and management of the disease.
Transjugular Intrahepatic Portosystemic Shunt Reductions
Authors: Joseph Arthur , Lopera Jorge
Published: May 2023

Transjugular intrahepatic portosystemic shunts (TIPS) are effective in reducing the portosystemic gradient and relieving complications of portal hypertension. Despite optimal patient selection, TIPS placement can be limited due to worsening hepatic encephalopathy and liver failure. In these cases, TIPS reduction may be necessary. A brief history of TIPS reduction and techniques for reduction are reviewed.
Portal Vein Thrombosis: Introduction to Imaging and Etiology
Authors: Gueyikian Sebouh , Ferral Hector
Published: May 2023

Portal vein thrombosis (PVT) is a complex medical condition that presents differently depending on the etiology. Appropriate imaging is necessary to determine the extent of clot, as well as its chronicity. While determining the characteristics of the PVT, imaging may also reveal the underlying cause of PVT. The purpose of this article is to describe the most common imaging modalities used in the evaluation of PVT, and to describe the findings of PVT.
Endovascular Alternatives to Transhepatic Shunt Creation
Authors: Sinha Ishan , Goldman Daryl T. , Patel Rahul S. , Nowakowski Francis S.
Published: May 2023

Portomesenteric decompression is often necessary to treat patients with refractory symptoms of portal hypertension. When transjugular or direct intrahepatic portosystemic shunt creation is not feasible or is inadequate, surgical portosystemic shunt creation is considered, which carries significant morbidity and mortality in these high-risk patients. Surgery is further complicated in patients with portomesenteric thrombosis who require concurrent thrombectomy and long-term anticoagulation. In this article, we outline the technique for performing advanced endovascular alternatives to intrahepatic portosystemic shunt creation including mesocaval and splenorenal shunting. We will also discuss some of the clinical considerations for treating these patients with symptomatic portal hypertension and portomesenteric thrombosis.
Bias against parents in science hits women harder
Authors: Staniscuaski Fernanda , Machado Arthur V. , Soletti Rossana C. , Reichert Fernanda , Zandonà Eugenia , Mello-Carpes Pamela B. , Infanger Camila , Ludwig Zelia M. C. , de Oliveira Leticia
Published: May 2023

Worldwide, parenthood remains a major driver for the reduced participation of women in the job market, where discrimination stems from people’s biases against mothers, based on stereotypes and misconceptions surrounding the vision of motherhood in our society. In academia, parenthood may be perceived as negatively affecting scientists’ commitment and dedication, especially women’s. We conducted a survey amongst Brazilian scientists and found that mothers self-reported a higher prevalence of negative bias in their workplace when compared to fathers. The perception of a negative bias was influenced by gender and career status, but not by race, scientific field or number of children. Regarding intersections, mothers with less than 15 years of hiring reported having suffered a higher rate of negative bias against themselves. We discuss implications of these results and suggest how this negative bias should be addressed in order to promote an equitable environment that does not harm women in science.
A method for LFM signal parameter estimation based on MWC system and STFT-DPT
Authors: Meng Shuo , Meng Chen , Wang Cheng
Published: May 2023

A method of estimating linear frequency modulation (LFM) signal parameters using compressed sampling (CS) data of a Modulated Wideband Converter (MWC) system is proposed. The short-time Fourier transform algorithm is used to analyze the CS signal of the MWC system, and the obtained CS signal frequency will present a form of multi-segment distribution. By intercepting the CS signal corresponding to the first segment frequency and analyzing the intercepted segment signal with discrete polynomial transform and Rife algorithm, the chirp rate and initial frequency estimation of the segment CS signal can be preliminarily estimated. According to the random sequence with cyclic displacement, the spectrum shift relationship between the input signal and the output signal can be calculated. Therefore, the parameter of the original signal can be estimated by using single channel CS data. Then, all channels are analyzed with the same method, and a more stable parameter estimation result can be obtained than the single channel output. Finally, combined with the simulation experiment, the proposed method can be used to estimate the initial frequency and chirp rate of the LFM signal using CS data effectively.
Ab initio description of magnetic and critical properties of spin-glass pyrochlore NaSrMn2F7
Authors: Amirabbasi Mohammad
Published: May 2023

In this study, I have investigated the magnetic and critical properties of manganese pyrochlore fluoride NaSrMn2F7, which exhibits a glass transition at Tf = 2.5 (K) due to charge disorder. A DFT + U + SOC framework is used in this paper to derive spin-Hamiltonian terms, including isotropic and anisotropic exchange interactions. An optimized geometry reveals a local distortion of the F–Mn–F angle along the ⟨111⟩ direction (95.48° and 84.51°), which is considered a weak bond disorder (δJ). Despite the complex structure of this material, first principle calculations show that its magnetic properties are only controlled by the nearest neighbor’s Heisenberg exchange interaction, and other interactions do not affect spin arrangements in the ground state. Thus, this material is considered a suitable candidate for studying electron correlation in spin glasses. Using a replica-exchange framework, Monte Carlo simulations indicate that with δJ=0, no phase transition is observed when magnetic susceptibility changes with temperature. The results demonstrate that the presence of local bond disorder serves as a perturbation, and the degeneracy of the energy manifold of the system persists if its effect is not taken into consideration. Based on δJ=0.13(meV) and the derived spin Hamiltonian, 2.6 (K) is obtained as the phase transition temperature.
Ferroelectric phase transitions in epitaxial antiferroelectric PbZrO3 thin films
Authors: Dufour Pauline , Maroutian Thomas , Vallet Maxime , Patel Kinnary , Chanthbouala André , Jacquemont Charlotte , Yedra Lluis , Humbert Vincent , Godel Florian , Xu Bin , Prosandeev Sergey , Bellaiche Laurent , Otoničar Mojca , Fusil Stéphane , Dkhil Brahim , Garcia Vincent
Published: May 2023

The archetypical antiferroelectric, PbZrO3, is currently attracting a lot of interest, but no consensus can be clearly established on the nature of its ground state as well as on the influence of external stimuli over its physical properties. Here, the antiferroelectric state of 45-nm-thick epitaxial thin films of PbZrO3 is established by observing the characteristic structural periodicity of antiparallel dipoles at the atomic scale, combined with clear double hysteresis of the polarization-electric field response related to antiferroelectric–to–ferroelectric phase transitions. Surprisingly, while the antiferroelectric state is identified as the ground state, temperature-dependent measurements show that a transition to a ferroelectric-like state appears in a large temperature window (100 K). Atomistic simulations further confirm the existence, and provides the origin, of such ferroelectric state in the films. Electric-field-induced ferroelectric transitions are also detected by the divergence of the piezoresponse force microscopy response. Using this technique, we further reveal the signature of a ferroelectric ground state for 4-nm-thick PbZrO3 films. Compared with bulk crystals, these results suggest a more complex competition between ferroelectric and antiferroelectric phases in epitaxial thin films of PbZrO3.
Efficient surface passivation of germanium nanostructures with 1% reflectance
Authors: Fung Tsun Hang , Isometsä Joonas , Lehtiö Juha-Pekka , Pasanen Toni P , Liu Hanchen , Leiviskä Oskari , Laukkanen Pekka , Savin Hele , Vähänissi Ville
Published: May 2023

Germanium (Ge) is a vital element for applications that operate in near-infrared wavelengths. Recent progress in developing nanostructured Ge surfaces has resulted in >99% absorption in a wide wavelength range (300–1700 nm), promising unprecedented performance for optoelectronic devices. However, excellent optics alone is not enough for most of the devices (e.g. PIN photodiodes and solar cells) but efficient surface passivation is also essential. In this work, we tackle this challenge by applying extensive surface and interface characterization including transmission electron microscopy and x-ray photoelectron spectroscopy, which reveals the limiting factors for surface recombination velocity (SRV) of the nanostructures. With the help of the obtained results, we develop a surface passivation scheme consisting of atomic-layer-deposited aluminum oxide and sequential chemical treatment. We achieve SRV as low as 30 cm s−1 combined with ∼1% reflectance all the way from ultraviolet to NIR. Finally, we discuss the impact of the achieved results on the performance of Ge-based optoelectronic applications, such as photodetectors and thermophotovoltaic cells.
Dust ion acoustic shock and solitary waves in a magnetized multi-component plasma with superthermal electrons
Authors: El-Monier S Y , El-Helbawy A S , Elsayed Moamen M. , Saad M
Published: May 2023

The nonlinear wave propagation in dusty plasmas has received great interest in recent decades due to its significance in interpreting some astrophysical phenomenon. Wave propagation in dust-particle plasmas is likely to differ significantly from that in normal plasmas. Depending on their time scales, several types of acoustic waves propagate in dusty plasmas. The propagation of DIA waves was investigated through a system of multi-component dusty plasma. The study shows the effect of the magnetic field and superthermal parameters on the Sagdeev potential. The Sagdeev potential falls with decreasing ω

ci
values and rising superthermal parameter k values. Bifurcation analysis is taken into our consideration and shown graphically under the two conditions (A > 0 ) and (A < 0). The presented theoretical work is useful in fully understanding disturbances of the electrostatic in space dusty plasmas.
Effects of the intramolecular structural change on the superconducting phase of the TMTTF systems
Authors: Kitamura Naoki
Published: May 2023

The tetramethyltetrathiafulvalene (TMTTF) system is one of the key materials to reveal mechanisms for unconventional superconductivity which is driven by electronic correlation. Recent experimental studies show that only the SbF6 salt, which exhibit the strongest charge order among the PF6 and AsF6 and SbF6 salts have anomalously high superconducting phase transition pressure for the insulating-superconducting phase and superconducting-metallic phase transitions. To investigate the relationship between the superconductivity and the strength of the charge order of these salts, we constructed an extended Hubbard model with the periodic boundary condition that takes into account the site-deformation potential driven by the intramolecular structural change which causes the nonuniform charge order. The superconductivity was examined by the Drude weight and the charge gap obtained by exact diagonalization. It was found that site-deformation potentials driven by the intramolecular conformational change, even small changes, move the insulator-superconductor transition point to higher pressure, i.e. too large transfer integrals. Without the site-deformation potentials, the transfer integral at the transition point is too small as compared with those values deduced from the first-principles calculations at the structures under atmospheric pressure and it is difficult to reproduce the transition.
An investigation into the effects of electric field on the structural and optical properties of L-Cysteine doped KDP crystals
Authors: Mahadik Ashwini , Soni P H , Mithani Amol
Published: May 2023

Nowadays, different methods to grow large-size crystals are gaining more interest compared to traditional crystal growth techniques. Based on the applications, crystals must be modified and for that new crystal growth techniques must be introduced to meet such demands. Potassium Dihydrogen Phosphate (KDP) crystal is a well-known non-linear optical (NLO) crystal which has numerous demands in various fields, for instance, electro-optic devices, lasers, modulators, etc and due to which its habit modification plays a significant role in research and development. A slow evaporation technique was used to grow transparent and good-quality L-Cysteine (1 mol% and 2 mol%) doped KDP crystals; however, the crystals were grown in presence of a constant electric field at room temperature. With powder x-ray Diffraction (XRD) analysis and utilising FullProf Suite software, the crystal structure of the crystal was confirmed. The inclusion of L-Cysteine into KDP lattice was confirmed with fourier transform infrared (FTIR) spectroscopy. Optical transmittance spectra were recorded in the range of 200 and 800 nm. Photoluminescence (PL) studies were conducted in the range of 300–600 nm in order to detect lattice defects and intrinsic impurities. The value of relative second harmonic generation (SHG) efficiency was observed to be enhanced for crystals grown in presence of an electric field.
Two-dimensional extended Hubbard model at half-filling
Authors: Sherman A
Published: May 2023

We consider the extended Hubbard model on a two-dimensional square lattice at half-filling. The model is investigated using the strong coupling diagram technique. We sum infinite series of ladder diagrams allowing for full-scale charge and spin fluctuations and the actual short-range antiferromagnetic order for nonzero temperatures. In agreement with earlier results, we find the first-order phase transition in the charge subsystem occurring at v = v

c
≳ U/4 with v and U the intersite and on-site Coulomb repulsion constants. The transition reveals itself in an abrupt sign change of a sharp maximum in the zero-frequency charge susceptibility at the corner of the Brillouin. States arising at the transition have alternating deviations of electron occupations from the mean value on neighboring sites. Due to fluctuations, these alternating occupation deviations have short-range order. For the considered parameters, such behavior is found for U ≲ 5t with t the hopping constant. For the insulating case U ≳ 6t, in which the transition is not observed, we find a continuous growth of the Mott gap with v. The evolution of the electron density of states with increasing v is also considered.
Evolutionary stability of social interaction rules in collective decision-making
Authors: Sigalou Anna , Mann Richard P
Published: May 2023

Social animals can use the choices made by other members of their groups as cues in decision making. Individuals must balance the private information they receive from their own sensory cues with the social information provided by observing what others have chosen. These two cues can be integrated using decision making rules, which specify the probability to select one or other options based on the quality and quantity of social and non-social information. Previous empirical work has investigated which decision making rules can replicate the observable features of collective decision making, while other theoretical research has derived forms for decision making rules based on normative assumptions about how rational agents should respond to the available information. Here we explore the performance of one commonly used decision making rule in terms of the expected decision accuracy of individuals employing it. We show that parameters of this model which have typically been treated as independent variables in empirical model-fitting studies obey necessary relationships under the assumption that animals are evolutionarily optimised to their environment. We further investigate whether this decision making model is appropriate to all animal groups by testing its evolutionary stability to invasion by alternative strategies that use social information differently, and show that the likely evolutionary equilibrium of these strategies depends sensitively on the precise nature of group identity among the wider population of animals it is embedded within.
A simple cognitive model explains movement decisions in zebrafish while following leaders
Authors: Oscar Lital , Li Liang , Gorbonos Dan , Couzin Iain D , Gov Nir S
Published: May 2023

While moving, animals must frequently make decisions about their future travel direction, whether they are alone or in a group. Here we investigate this process for zebrafish (Danio rerio), which naturally move in cohesive groups. Employing state-of-the-art virtual reality, we study how real fish (RF) follow one or several moving, virtual conspecifics (leaders). These data are used to inform, and test, a model of social response that includes a process of explicit decision-making, whereby the fish can decide which of the virtual conspecifics to follow, or to follow in some average direction. This approach is in contrast with previous models where the direction of motion was based on a continuous computation, such as directional averaging. Building upon a simplified version of this model (Sridhar et al 2021 Proc. Natl Acad. Sci.
118 e2102157118), which was limited to a one-dimensional projection of the fish motion, we present here a model that describes the motion of the RF as it swims freely in two-dimensions. Motivated by experimental observations, the swim speed of the fish in this model uses a burst-and-coast swimming pattern, with the burst frequency being dependent on the distance of the fish from the followed conspecific(s). We demonstrate that this model is able to explain the observed spatial distribution of the RF behind the virtual conspecifics in the experiments, as a function of their average speed and number. In particular, the model naturally explains the observed critical bifurcations for a freely swimming fish, which appear in the spatial distributions whenever the fish makes a decision to follow only one of the virtual conspecifics, instead of following them as an averaged group. This model can provide the foundation for modeling a cohesive shoal of swimming fish, while explicitly describing their directional decision-making process at the individual level.
Quasi-two-body decays
in perturbative QCD*
Authors: Zhao Yan-Chao , Zhang Zhi-Qing , Zhang Zi-Yu , Sun Zhi-Jie , Meng Qiu-Bo
Published: May 2023

In this work, we investigate the quasi-two-body decays

with

using the perturbative QCD (PQCD) approach. The description of final state interactions of the

pair is achieved through the two-meson distribution amplitudes (DAs), which are normalized to the time-like form factor. The PQCD predictions on the branching ratios of the quasi-two-body decays

show an obvious hierarchy:

and

. From the invariant mass

-dependence of the decay spectrum for each channel, one can find that the branching fraction is concentrated in a narrow region around the

pole mass. Thus, one can obtain the branching ratios for the corresponding two-body decays

under the narrow-width approximation. We find that the branching ratios of the decays

are consistent with the previous PQCD calculations within errors. These predictions will be tested in future experiments.
Study on the Effect of Current Density on Electrolysis State in a 6kA Praseodymium Electrolyzer
Authors: Gao Peng , Li Zhifeng , Gao Ming , Cai Jianuo , Tao Like
Published: May 2023

Current density is an important index parameter to study the state of rare earth electrolysis, and the lack of simulation modelling of current density in the electrolyzer in the actual process production chain affects the quality of products and the improvement of electrolytic current efficiency. Considering the process parameters in the electrolysis process, the simulation model of the 6kA praseodymium electrolyzer was constructed by using the numerical simulation software COMSOL to improve the electrolysis current efficiency and reduce the electrolysis power consumption. The simulation analysis of the electrolysis process was realized by using the coupled electric-thermal field simulation. The simulation results verified the accuracy of the coupling theory and combined it with the coupling simulation study and verification experiments. It was concluded that the electrolysis environment in the tank was ideal when the cathode current density was in the range of 5.72 A/cm2~6.80 A/cm2. The ratio of anode current density to cathode current density was in the range of 1.37~1.62, the current efficiency was higher than 75%, and the electrolysis power consumption was lower than 200 kW·h·kg−1. The electrolysis efficiency is good.
First-principles study of V-doped TiAlN and TiN coating materials
Authors: Yang JunRu , Lv Hao , Yue YanPing , Zhu Ran
Published: May 2023

In this paper, the unit cell model of V-doped TiN and TiAlN is constructed, and the formation enthalpy of the unit cell and lattice parameters of the doped models are calculated by first principles. The results show that the lattice parameters of TiN and TiAlN unit cells are reduced, and the structure of the unit cell is stable after V is doped into TiN and TiAlN unit cells. The structural stability of the TiN unit cell increases with V doping into the TiN unit cell, while that of the TiAlN unit cell decreases with the increase of V doping into the TiAlN unit cell. The analysis results of unit cell hardness and Mulliken population show that the hardness of TiN and TiAlN coating materials is improved by doping V and that hardness increases with the increase of V doping. The reason is that V doping into TiN and TiAlN unit cells increases their average bond population. The covalent bonding property of the unit cell is increased, and the interatomic bonding strength of the unit cell is increased, which leads to an increase in the unit cell’s hardness.
Effects of pressure and height on printability for soft materials
Authors: Lin Zening , Hong Yang , Zhu Yiming , Yang Yun , Jiang Tao , Shang Jianzhong , Luo Zirong
Published: May 2023

Extrusion-based printing with soft materials is an additive manufacturing technology, which is widely used in biomedical fields such as skin reconstruction, muscle repair, and cartilage regeneration, etc. Constructing high-precision printed structures and maintaining high cellular bioactivity are key issues in the in vitro construction of tissues and organs using extrusion bioprinting. There are some printing paraments such as pressure, height, nozzle type (eg, length and inner diameter), translational speed, etc. can have a huge influence on the structural fidelity. In this work, we put forward a quantitative test method to evaluate the printing accuracy is influenced by pressure and height. The results show that higher pressure can benefit uniformity (the filament width is equal everywhere), and higher height leads to higher uniformity only in low pressure for paste. This study can provide researchers with the tunning suggestions of printing paraments, which may promote the development of printing accuracy in the future.
Local maximum multi-synchrosqueezing transform for the analysis of time-varying signals
Authors: Wei Dahuan , Huang Kangguang , Huang Huang , Wang Bo , Ao Jingzhu , Deng Liujie , Peng Jiansheng
Published: May 2023

Synchrosqueezing transform (SST) and its improved algorithm are used to process time-varying signals and have been widely developed in the field of signal processing recently. However, processing strong time-varying signals is still a tricky problem. Multisynchrosqueezing transform (MSST) is an excellent time-frequency (TF) analysis technique for processing strong time-varying signals. However, some TF points will not be rearranged using this method. So we propose a new algorithm named local maximum multi-synchrosqueezing transform. The method detects the local maximum of MSST to address the problem existing in MSST. In this way, a near-perfect TF analysis method used to analyze time-varying signals is generated. Simulated signal and experimental data demonstrate the effectiveness of our method.
Design and Analysis of the Differential Pump Driven by the Novel Eccentric Non-Circular Gears
Authors: Zhao Huacheng , Liu Zheng
Published: May 2023

In order to obtain a better driving mechanism of the differential pump, a high-performance differential velocity vane pump was presented. The pump was driven by the novel eccentric non-circular gears. The working principle and structure of the differential pump were studied. The transmission mechanism of the high-order multisegment deformed eccentric non-circular gears were established, then the transmission characteristics were discussed. Finally an example was given. The example showed that the high-order multisegment deformed, eccentric non-circular gears could meet the large displacement requirements of the differential velocity vane pump.
Study on energy-saving quantitative evaluation of hydraulic excavator
Authors: Li Bei , Chen Yanhui , Zang Xiaohui , Jiang Heng , Chen Lichuang , Wei Junmao , Huang Zhengwei
Published: May 2023

The energy-saving of hydraulic excavators is evaluated by two significant indicators: operating efficiency (digging weight per unit time) and fuel consumption (volume of fuel consumed per unit time). These two indicators are only the final test results and cannot quantitatively evaluate the whole operation process of the excavator. In this paper, a complete set of experimental protocols is designed to quantify the energy-saving of the excavator by collecting its attitude data, fuel consumption data, and digging weight data in real-time. By restoring the excavator’s three-dimensional posture through the multi-body dynamics model, the posture corresponding to the energy efficiency of the excavator can be grasped very intuitively, which provides a research direction for optimizing the energy efficiency of the excavator.
In-service detection of high-temperature pressure pipeline welds based on DR technology
Authors: Chen Le
Published: May 2023

High-temperature pressure pipeline is an important medium conveying equipment in industrial production. Due to its high temperature and high-pressure characteristics, it is very important to implement effective in-service detection. This paper focuses on the successful application of X-ray digital imaging detection (DR) technology in the process of leak detection and disposal of petrochemical pipeline flange welds and analyzes the advantages of DR technology for in-service detection of the high-temperature pressure pipeline. Finally, the shortcomings of the current application and further research directions are put forward.
Study on the Stability of a Repair Process for Carbon Fiber Laminates
Authors: Tian Jianfeng , Lu Guofu , Zhang Jinkui , Zhang Yinghong
Published: May 2023

Carbon fiber-reinforced resin matrix composites are often used in the surface structure of helicopters. In the process of flight, the structure often suffers from different degrees of damage due to the influence of the harsh environment. To explore the superiority of the repair method and obtain a good repair process, the intact and damaged carbon fiber composite laminates were prepared in this paper. The damaged specimens were repaired by single-sided double-layer patch bonding. The allowable value of tensile strength of carbon fiber laminates was tested, and the mechanical properties of carbon fiber composite laminates after repair were studied. Combined with the failure mode of the specimen after failure, the results show that the mechanical properties of the repaired specimen can be restored to about 81.9 % of the non-destructive specimen. The single-sided double-layer patch can effectively improve the mechanical properties of the middle loading area. The repair process has high reliability and good stability, which provides a new method for the repair of the composite laminate structure.