bluuebunny/crossref_metadata_2025 huggingface dataset:
Verstehen, was passiert: Erfolgreich verhandeln, auch wenn die Gegenseite irrational wird
Authors: Schlüchtermann Jörg
Published: September 2021

Normalerweise verlaufen Verhandlungen im Krankenhauseinkauf in konstruktiver Atmosphäre und mit rationalen Argumenten. Doch was, wenn die Gegenseite vielleicht auch noch völlig überraschend emotional, unfair und irrational wird? Dann sollte man vorbereitet sein! Dieser Beitrag zeigt Möglichkeiten auf, Irrationalitäten der Gegenseite zu erkennen, zu verstehen und die richtigen Gegenmaßnahmen zu ergreifen.
Serviceorientierung im Krankenhaus: Service is the new Quality
Authors: Kriegel Johannes
Published: September 2021

Serviceorientierung ist ein ganzheitlicher Ansatz für die kundenbezogene Ausrichtung von wettbewerbsgerichteten und wirtschaftlichen Dienstleistungen. Sie entwickelt sich auch im Gesundheits- und Krankenhauswesen zunehmend zum entscheidenden Werttreiber und Differenzierungsfaktor. Neben der Abstimmung auf den Endkonsumenten bzw. Patienten lassen sich auch Vorteile hinsichtlich der internen Kunden sowie der systemübergreifenden Stakeholder identifizieren und realisieren.
Verbesserung der Logistikeffizienz: Benchmark-Studie Krankenhauslogistik 2020
Authors: Otten Hubert , Bosseray Sebastian
Published: September 2021

Zum dritten Mal wurde im Institut für Health Care Management eine Benchmark-Studie Krankenhauslogistik durchgeführt. In diesem Kontext wurden jeweils Struktur- und Transportmassendaten erhoben und Kennzahlenwerte zu Produktivität, Servicequalität, Auftragsstabilität und Kosten berechnet. Ausgewählte Auszüge aus der Studie werden im folgenden Fachbeitrag vorgestellt.
Erfahrungsbericht: Arzneimittellogistik im Universitätsklinikum
Authors: Schulze Florian , Knoth Holger
Published: September 2021

Die Patientenversorgung sowie Forschung und Lehre im Universitätsklinikum Dresden werden maßgeblich durch die Klinikapotheke als zentrale Organisations- und Funktionseinheit unterstützt und mit den hierfür erforderlichen Arzneimitteln beliefert. Insbesondere in Zeiten der COVID-19-Pandemie kommt dabei der Liefersicherheit und Versorgungsqualität eine besondere Bedeutung zu.
Aktueller Stand und Auswirkungen: Das VerSanG ist tot, es lebe das VerSanG!
Authors: Ströhmann Martin
Published: September 2021

Zahlreiche Reformvorhaben zeigen, dass es einen politischen Willen zu mehr „Compliance“ in Deutschland gibt. Wie kann auf Basis des aktuellen Regierungsentwurfs ein Verbandssanktionengesetz 2.0 in der nächsten Legislaturperiode aussehen.
Kommunikation: Einkäufer-Lieferanten-Gespräche in Zeiten von Corona
Authors: Reeck Adrian
Published: September 2021

Mit Beginn der Pandemie veränderte sich für die Teilnehmer und Akteure im Gesundheitswesen innerhalb kürzester Zeit vieles grundlegend: noch nie da gewesener Mangel an bestimmten Produkten, weltweiter Kampf um die sehr begrenzten Ressourcen der persönlichen Schutzausrüstung (PSA), eine deutliche Zunahme von Konkurrenz im Beschaffungsprozess sowie eine Vielzahl bis dato unbekannter, dem Gesundheitsmarkt fremder Lieferanten.
Luftfilter im Gesundheitswesen: Die vier wichtigsten Kriterien für die Anschaffung
Authors: Thelen Achim
Published: September 2021

Dieser Artikel ist nur als PDF-Dokument verfügbar.
Scale-dependent Rayleigh–Taylor dynamics with variable acceleration in a finite-sized domain for three-dimensional flows
Authors: Hwang Hanul , Chan Wai Hong Ronald , Jain Suhas S. , Abarzhi Snezhana I.
Published: September 2021

Three-dimensional Rayleigh–Taylor instability (RTI) with the time-varying acceleration in a finite domain is investigated in a systematic framework. The acceleration magnitude follows a power law in time with an exponent greater than −2. Applying the group theory, the instabilities are demonstrated considering the irreducible representations for observable periodic structures with a square symmetry in the plane normal to the acceleration. We derive the dynamical system and illustrate the universal form of the solutions in the linear and nonlinear regimes. The scale-dependent dynamics are shown to be single scale and multiscale in the two regimes, respectively. For the nonlinear regime solutions, fundamental scales are derived bridging the solutions in the finite- and infinite-sized domains. Special solutions for bubbles and spikes are identified from a one-parameter family of solutions. The effect of domain confinement is that the velocity and curvature decreases and shear increases as the domain size is reduced. The theory provides predictions for the flow field and demonstrates the interfacial behavior of RTI. Our results are in good agreement with the prior studies and also provide new benchmarks for experiments and simulations.
Flow prediction using dynamic mode decomposition with time-delay embedding based on local measurement
Authors: Yuan Yuan , Zhou Kaiwen , Zhou Wenwu , Wen Xin , Liu Yingzheng
Published: September 2021

We develop a method for the prediction of flow fields based on local particle image velocimetry (PIV) measurement. High spatial resolution can be achieved by focusing PIV on local flow regions; however, it is difficult for standard dynamic mode decomposition (DMD) to predict the temporally resolved flow field based on limited information in sub-domain. In this regard, the local flow field is embedded using time-delay to augment the spatial dynamics. As such, both high temporally and spatially resolved flow fields can be faithfully obtained from local PIV measurement using the DMD method. Using fabricated patterns, we demonstrate that DMD with time-delay embedding can faithfully predict dynamic patterns over a long time interval, whereas the standard DMD can only match the ground truth briefly following initiation. Using PIV measurement of a wake flow and a highly dynamic sweeping jet flow, the DMD with time-delay embedding can increase the temporal resolution up to 100 times with a prediction error rate of approximately 8%. Compared with wake flow, where unsteady flow patterns are relatively weak, a sweeping jet flow demonstrates that the prediction performance is improved even more significantly using time-delay embedding compared with standard DMD when the flow is highly dynamic. For sweeping jet flow, the prediction error rate can drop from 56% using standard DMD to 8.3% by embedding a time-delay smaller than five steps, for a small cost of calculation time. In addition, the DMD with time-delay embedding shows robustness to small noise. For data with high noise whose signal-to-noise ratio is 15, the method has an error rate of less than 5%.
Theoretical Determination of p
Authors: Rachuru Sanjeev , Vandanapu Jagannadham , Skelton Adam A.
Published: September 2021

pKas of P(1)-H deprotonation of all phosphole group compounds, phosphole (C4H4PH), 1,2 and 1,3-diphospholes (C3H3PPH), 1,2,3, and 1,2,4-triphospholes (C2H2P2PH), tetraphosphole (CHP3PH), and pentaphosphole (P4PH) are determined by DFT calculations. We have compared these to the pKas of the analogue azole group compounds and the factors that cause the differences of these values are discussed in terms of the stabilities of both the phosphole anions and azole anions.
Accelerated aging test of seed vigour for predicting field emergence of wet direct-seeded rice
Authors: Alahakoon A. A. C. B. , Abeysiriwardena D. S. de Z. , Damunupola J. W. , Hay F. R. , Gama-Arachchige N. S.
Published: September 2021

Seed vigour tests enable detection of seedlots with high field emergence and storability. Here, an accelerated aging (AA) protocol is proposed as a seed vigour test for predicting field emergence of wet direct-seeded rice (Oryza sativa) seeds. Seeds of 10 rice varieties, eight with intermediate bold grain type and two with short round grain type, harvested in 2017 were subjected to AA at temperatures of 40–45°C for periods of 24–120 h, or to standard seed germination at 25°C, followed by emergence testing in a rice field. AA treatments that were found to be appropriate to predict field emergence in 2017 were repeated with the same varieties harvested in 2018. Standard seed germination could not predict field emergence of tested rice varieties (r <0.2, α = 0.01). The appropriate AA treatment to predict field emergence was dependent on the grain type. AA treatment 43°C/72 h was found to be the best for predicting field emergence of wet direct-seeded rice of intermediate bold grain type (r >0.8, α = 0.01). Further studies are needed to find the best AA test for predicting field emergence of varieties of short round grain type.
: placing resistance to third-generation cephalosporins and fluoroquinolones in Australia and New Zealand into perspective
Authors: White Rhys T
Published: September 2021

At least 300 million urinary tract infections (UTIs) occur annually worldwide. Uropathogenic Escherichia coli (UPEC) are the leading cause of UTIs. The discovery of antibiotics has revolutionised modern medicine. Yet, overusing antibiotics has accelerated the emergence of antimicrobial resistance (AMR), with UPEC driving the dissemination of AMR globally. Resistance to broad-spectrum antibiotics like third-generation cephalosporins (3GCs) and fluoroquinolones threatens public health. Extended-spectrum β-lactamase (ESBL)-producing E. coli precipitate resistance, particularly when these antibiotics are used as empirical therapies against UPEC. In response, the Centers for Disease Control and Prevention in the United States have listed ESBL-producing Enterobacterales, such as E. coli as a severe threat. Additionally, the World Health Organization have classified 3GCs and fluoroquinolones as the highest priority (critically important antimicrobials), where these therapies are only recommended following susceptibility testing. The present report demonstrates the distributions of E. coli cases with resistance to 3GC and fluoroquinolones in Australia and New Zealand and contextualises trends with European reports. This investigation emphasises the value of epidemiology and the justification of evidence-based interventions using data as an essential resource for reducing resistance to our ‘first-line’ antibiotics.
Characterization of neutral particle fluxes from ICWC and ECWC plasmas in the TOMAS facility
Authors: Moon Sunwoo , Petersson Per , Brunsell Per , Rubel Marek , Goriaev Andrei , Ragona Riccardo , Möller Sören , Brezinsek Sebastijan , Nicolai Dirk , Linsmeier Christian , Kovtun Yurii , Wauters Tom
Published: September 2021

Electron- (ECWC) and ion- (ICWC) cyclotron wall conditioning are essential means for controlled fusion to modify the surface state of plasma-facing components in order to reduce impurity generation and fuel accumulation in the wall. Development of ECWC and ICWC requires characterization of neutral particle fluxes generated in discharges, because neutrals enhance the homogeneity of the conditioning, which may contribute to remote or shadowed areas, especially in the presence of a permanent magnetic field (e.g. W7-X, ITER). A time-of-flight neutral particle analyzer (ToF-NPA) with 4.07 m flight distance is employed to measure time- and energy-resolved low energetic (<1 keV) neutral particle distributions. The ToF-NPA setup tested at the EXTRAP T2R reversed field pinch was installed at the TOMAS toroidal plasma facility to determine low energy neutral particle fluxes while investigating the impact of the gas pressure in the instrument and compatibility with low count rates during EC- and ICWC discharges. TOMAS has a major radius of 0.78 m and provides various plasma operation conditions: toroidal magnetic field up to 0.12 T, EC frequency 2.45 GHz with the power of 0.6–6 kW, IC frequency of 10–50 MHz with the power of up to 6 kW. Early results on the characterization of three phases (EC only, EC + IC, and IC only) of hydrogen discharges demonstrate: (i) the low energy (10–725 eV) neutrals distribution has been determined by the NPA system, (ii) the mixed EC + IC phase produces the highest population of neutral particles, while the EC only provides one order of magnitude lower rate, (iii) the neutrals produced in IC only have higher average energy (28 eV) than EC only (7 eV) and EC + IC (16 eV).
Observation of photon recoil effects in single-beam absorption spectroscopy with an ultracold strontium gas
Authors: Hu Fachao , Tan Canzhu , Jiang Yuhai , Weidemüller Matthias , Zhu Bing
Published: September 2021

We report on observing photon recoil effects in the absorption of a single monochromatic light at 689 nm through an ultracold 88Sr gas, where the recoil frequency is comparable to natural linewidth of the narrow-line transition 5s2 1S0–5s5p 3P1 in strontium. In the regime of high-saturation, the absorption profile becomes asymmetric due to the photon-recoil shift, which is of the same order as the natural linewidth. The lineshape is described by an extension of the optical Bloch equations including the momentum transfers to atoms during emission and absorption of photons. Our work reveals the photon recoil effects in a simplest single-beam absorption setting, which is of significant relevance to other applications such as saturation spectroscopy, Ramsey interferometry, and absorption imaging.
Enhanced thermoelectric performance of PEDOT: PSS films via ionic liquid post-treatment
Authors: Yang Jiaji , Li Xuejing , Jia Yanhua , Zhang Jiang , Jiang Qinglin
Published: September 2021

Thermoelectric (TE) energy harvesting can effectively convert waste heat into electricity, which is a crucial technology to solve energy concerns. As a promising candidate for energy conversion, poly(3,4-ethylenedioxythiophene): poly (styrene sulfonate) (PEDOT:PSS) has gained significant attention owing to its easy doping, high transparency, and solution processability. However, the TE performance of PEDOT:PSS still needs to be further enhanced. Herein, different approaches have been applied for tuning the TE properties: (i) direct dipping PEDOT:PSS thin films in ionic liquid; (ii) post-treatment of the films with concentrated sulfuric acid (H2SO4), and then dipping in ionic liquid. Besides, the same bis(trifluoromethanesulfonyl)amide (TFSI) anion and different cation salts, including 1-ethyl-3-methylimidazolium (EMIM+) and lithium (Li+), are selected to study the influence of varying cation types on the TE properties of PEDOT:PSS. The Seebeck coefficient and electrical conductivity of the PEDOT:PSS film treated with H2SO4EMIM:TFSI increase simultaneously, and the resulting maximum power factor is 46.7 μW⋅m−1⋅K–2, which may be attributed to the ionic liquid facilitating the rearrangement of the molecular chain of PEDOT. The work provides a reference for the development of organic films with high TE properties.
Brightening single-photon emitters by combining an ultrathin metallic antenna and a silicon quasi-BIC antenna
Authors: Jia Shangtong , Li Zhi , Chen Jianjun
Published: September 2021

Bright single-photon emitters (SPEs) are fundamental components in many quantum applications. However, it is difficult to simultaneously get large Purcell enhancements and quantum yields in metallic nanostructures because of the huge losses in the metallic nanostructures. Herein, we propose to combine an ultrathin metallic bowtie antenna with a silicon antenna above a metallic substrate to simultaneously get large Purcell enhancements, quantum yields, and collection efficiencies. As a result, the brightness of SPEs in the hybrid nanostructure is greatly increased. Due to the deep subwavelength field confinement (mode size < 10 nm) of surface plasmons in the ultrathin metallic film (thickness < 4 nm), the Purcell enhancement of the metallic bowtie antenna improves by more than 25 times when the metal thickness decreases from 20 nm to 2 nm. In the hybrid nanostructures by combining an ultrathin metallic bowtie antenna with a silicon antenna, the Purcell enhancement (Fp≈2.6 × 106) in the hybrid nanostructures is 63 times greater than those (≤ 4.1 × 104) in the previous metallic and hybrid nanostructures. Because of the reduced ratio of electromagnetic fields in the ultrathin metallic bowtie antenna when the high-index silicon antenna is under the quasi-BIC state, a high quantum yield (QY ≈ 0.70) is obtained. Moreover, the good radiation directivity of the quasi-BIC (bound state in the continuum) mode of the silicon antenna and the reflection of the metallic substrate result in a high collection efficiency (CE ≈ 0.71). Consequently, the overall enhancement factor of brightness of a SPE in the hybrid nanostructure is EF*≈ Fp × QY × CE ≈ 1.3 × 106, which is 5.6 × 102times greater than those (EF*≤ 2.2 × 103) in the previous metallic and hybrid nanostructures.
Synthesis of two-dimensional/one-dimensional heterostructures with tunable width
Authors: Wang Di , Zhang Zucheng , Li Bo , Duan Xidong
Published: September 2021

Two-dimensional/one-dimensional (2D/1D) heterostructures as a new type of heterostructure have been studied for their unusual properties and promising applications in electronic and optoelectronic devices. However, the studies of 2D/1D heterostructures are mainly focused on vertical heterostructures, such as MoS2 nanosheet-carbon nanotubes. The research on lateral 2D/1D heterostructures with a tunable width of 1D material is still scarce. In this study, bidirectional flow chemical vapor deposition (CVD) was used to accurately control the width of the WS2/WSe2 (WS2/MoS2) heterostructures by controlling reacting time. WSe2 and MoS2 with different widths were epitaxially grown at the edge of WS2, respectively. Optical microscope, atomic force microscope (AFM), and scanning electron microscope (SEM) images show the morphology and width of the heterostructures. These results show that the width of the heterostructures can be as low as 10 nm by using this method. The interface of the heterostructure is clear and smooth, which is suitable for application. This report offers a new method for the growth of 1D nanowires, and lays the foundation for the future study of the physical and chemical properties of 2D/1D lateral heterostructures.
A MXene-functionalized paper-based electrochemical immunosensor for label-free detection of cardiac troponin I
Authors: Wang Li , Han Yufeng , Wang Hongchen , Han Yaojie , Liu Jinhua , Lu Gang , Yu Haidong
Published: September 2021

Convenient, rapid, and accurate detection of cardiac troponin I (cTnI) is crucial in early diagnosis of acute myocardial infarction (AMI). A paper-based electrochemical immunosensor is a promising choice in this field, because of the flexibility, porosity, and cost-efficacy of the paper. However, paper is poor in electronic conductivity and surface functionality. Herein, we report a paper-based electrochemical immunosensor for the label-free detection of cTnI with the working electrode modified by MXene (Ti3C2) nanosheets. In order to immobilize the bio-receptor (anti-cTnI) on the MXene-modified working electrode, the MXene nanosheets were functionalized by aminosilane, and the functionalized MXene was immobilized onto the surface of the working electrode through Nafion. The large surface area of the MXene nanosheets facilitates the immobilization of antibodies, and the excellent conductivity facilitates the electron transfer between the electrochemical species and the underlying electrode surface. As a result, the paper-based immunosensor could detect cTnI within a wide range of 5–100 ng/mL with a detection limit of 0.58 ng/mL. The immunosensor also shows outstanding selectivity and good repeatability. Our MXene-modified paper-based electrochemical immunosensor enables fast and sensitive detection of cTnI, which may be used in real-time and cost-efficient monitoring of AMI diseases in clinics.
Research on Porosity and Performance of Self-compacting Backfill Materials
Authors: Jian Zhao , Mingzhe Zhao , Lei Tang , Penghui Chen , Peiwei Gao
Published: September 2021

This paper researched and developed a new type of self-compacting backfill material behind the wall of underground pipelines, and compared and analyzed the relationship between the water-binder ratio, porosity and compressive strength of the two backfill materials. The average pore size of the foam backfill material increases with the water-binder ratio. While increasing, the porosity tends to decrease with the increase of water-binder ratio, and the compressive strength first increases and then decreases with the increase of water-binder ratio; self-compacting backfill material has excellent properties such as self-compacting, light weight and anti-vibration. It is a new type of building materials which can meet the requirements of fluidity and strength for backfilling after penetrating the yellow pipe wall.
Key technology of overlapping tunnel construction with earth pressure balance shield method in rheological strata
Authors: Yu Qingru , Zhai Shihong , Liu Wen , Liu Tianrui , Song Hu
Published: September 2021

Based on the existing bridge structure of Foshan Metro Line 2, this paper summarizes the engineering geological conditions of the overlapping tunnels, uses three-dimensional finite element analysis, establishes an engineering geological model, and analyzes the parameters of the upper tunnel in the disturbed surrounding rock, shield attitude control and its influence on the tunnels already built on the lower floors. Finally, the monitoring and control results during the construction of the shield tunneling of the overlapping tunnels are analyzed to verify that the construction of the overlapping tunnels in the rheological strata has a greater impact on the ground settlement of about 20m, and the soft foundation reinforcement of the lower tunnels in advance can make the soil settlement greatly reduced, and the stress concentration area is reduced. After the double-tube jet-grouting piles are reinforced, the shield tunneling of the upper overlap tunnel has little effect on the existing tunnel below, and the reinforcement effect is better, which can make the construction go successfully. The analysis results of this paper can provide decision support for the construction of overlapping tunnels in rheological strata.
Experimental research on combustion and explosion characteristics of medium density fiberboard on building
Authors: Wu Jiameng , Zhu Shunbing , Pang Zizheng , Duan Yi
Published: September 2021

In recent years, the amount of medium density fiberboard(MFD) used in the construction industry is huge. The dust produced in the production has a great risk of dust combustion and explosion in different thermal runaway environment. Therefore, this paper takes the MDF dust as the research object to explore its combustion and explosion characteristics. The minimum ignition temperature of dust layer and 20L explosion vessel were used to study the changes of minimum ignition temperature(MIT) and combustion morphology of dust layer with different particle sizes of wood powder, and the influence of different influencing factors on the maximum explosion pressure was analyzed. The results show that with the decrease of particle size, the MIT decreases from 350°Cto 260°C, the maximum heating rate increases, the carbonization phenomenon becomes more obvious, and the maximum explosion pressure increases gradually; Under 200 mesh dust, with the increase of mass concentration and ignition delay, the maximum explosion pressure first increases and then decreases, and 50 g/m3 and 60 ms are the best mass concentration and ignition delay.
Study on fault sealing mechanism based on rock physics simulation experiment
Authors: Qu Lisha , Liu Jiageng , Zhou Guangqing , Wang Jiandong , Li Jing , Wang Chongzhi , Zhu Rui
Published: September 2021

At present, the development of fault oil and gas reservoirs has become an important way for to increase oil and gas productivity in China. However, due to the complex internal stress state of rock faults, the phenomenon of oil and gas escape is prone to occur during the mining process, so it is of great significance to study the sealing mechanism of the rock fault. For this reason, based on the theory of fault sealing, rock physical simulation experiments of fault sealing were carried out, and the mechanism of fault sealing and its main controlling factors were deeply studied. The results show that the rock fault dip and the argillaceous content of the fault filling are the main controlling factors for fault sealing; The essence of fault lateral sealing and vertical sealing is the sealing of the displacement pressure difference; As the dip angle of the fault increases, the lateral sealing of the fault becomes better, while the vertical sealing becomes worse; with the increase of the argillaceous content of the fault filling, the lateral and vertical sealability of the fault becomes better.
Versatile hydrogel based on polyvinyl alcohol/chitosan/regenerated silk fibroin
Authors: Sun Qinyue , Fu Jizhu , Zhang Heng , Yang Huihui , Wang Yumin , Xiong Yi , Zeng Wei , Wang Faniu , Xu Chao
Published: September 2021

Versatile sensors have broad application prospects in human motion detection, health monitoring, wearable electronic devices and flexible electronic skin and other emerging fields. In this work, the enhanced hydrogel was prepared by freezing and thawing process with calcium ion crosslinking. This composite material shows excellent flexibility and elasticity, and after being cut in half, it can automatically heal well in a short time without external force. It shows great potential in flexible and wearable devices.
Experimental research on dilatancy characteristics of coarse-grained soils by triaxial compression test
Authors: Du Jun , Qiu Zhi-gang
Published: September 2021

Dilatancy is a basic behavior of soils which is closely related to strength and deformation behaviors of soils and makes soils significantly different from normal elastic materials. A large-scale triaxial compression testing machine was used to study the dilatancy characteristics of coarse-grained soils of earth rock dam. The results show that the confining pressure has a significant effect on the dilatancy of coarse-grained soils, the soil first shrinks and then expands under low confining pressure, and the soil mainly produces shear shrinkage deformation under high confining pressure. When the soil changes from shear shrinkage to dilatancy, the strain ratio of soil changes abruptly. Rowe dilatancy model can reflect the dilatancy deformation characteristics of coarse-grained soils. The parameter Kf
of the model tends to be constant with the increase of axial strain, and the parameter Kf
of coarse-grained soils is smaller when the confining pressure is larger.
Construction of Fe(OH)3-ZnO/NF nanotube arrays with enhanced performance for water splitting
Authors: Fu Yueyue , Pan Jiaqi , Xiao Guangsheng , Li Chaorong
Published: September 2021

Well-aligned hierarchical hollow nanoarrays containing ZnO core and Fe(OH)3 nanotube shell have been synthesized via simple one-step hydrothermal method and etching at room temperature. The obtained catalyst has a high specific surface area, a large number of catalytic active sites and good chemical stability. The resulting Fe(OH)3-ZnO/NF nanotubes exhibits promising behavior in alkaline solution. When the current density is 10 mA cm-2, the HER and OER overpotentials (η10) of Fe(OH)3-ZnO/NF are 190 and 388 mV, respectively.
Butane Tetracarboxylic Acid as Green Modifier for Tuned Hydrophilicity of Surface Modified Cellulose
Authors: Yu Shuxian , Wei Jie , Shuai Jia , Lyu Shaoyi , Pan Chen , Shao Ziqiang
Published: September 2021

This study proposes one straightforward way for butane tetracarboxylic acid modification of cellulose nanofibrils (CNF). Esterified cellulose nanofibrils (ECNF) were characterized using Fourier Transform Infrared Spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM). The reaction mechanism between tetracarboxylic acid modification and CNF was discussed. The resultant ECNF exhibited improved hydrophobicity in water compared with pure CNF. These results confirmed how esterified (ECNF) biobased nanoparticles with tuned hydrophilicity, obtained by treatment with a low cost, sustainable and easily soluble cross-linker, have the potential for widespread applicability in the field polymeric based nanocomposites having different polarity.
Effect of particle size on electrochemical performance of lithium iron phosphate materials
Authors: He Rui , Wei Aijia , Bai Xue , Zhang Lihui , Li Xiaohui , Liu Zhenfa
Published: September 2021

LiFePO4 material has many virtues, such as rich raw materials, low price, excellent high temperature cycling performance and safety property. Lithium ion battery with LiFePO4 as positive electrode active material is the most promising. However, compared with other positive electrode active materials, LiFePO4 material has the inherent disadvantage of poor electrical conductivity, it greatly limits its dynamic characteristics at low temperature. In this paper, the effect of particle size of LiFePO4/C material on the low temperature performance prepared via solid-state method is systematically investigated. The structure and morphology of the samples were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). The electrochemical properties of cathode materials were studied by Land 2001.
Determination of Cr(VI) precipitation in small faucet samples by spectrophotometry and evaluation of the uncertainty
Authors: Liping Guo
Published: September 2021

A spectrophotometric method for the determination of Cr(VI) precipitation in small volume faucet samples which were less than 50 mL was established. The method was verified by precision and standard addition recovery, and the uncertainty of the measurement results was evaluated. After analysis, the precipitation of Cr(VI) in the extracting solution of the faucet samples was measured as (50.7±1.7) μg/L, (k=2, P=95%). Small volume detection method which just needs 5 mL samples solution had the advantages of small sample consumption, simple and quick operation, and can meet the requirements of the product, especially the faucet samples with small internal volume.
One-dimensional dynamic model of cold-formed channel beam with deformed cross-section
Authors: Ai Wenxu , Zhang Lei , Zheng Zijun , Liang Shilei
Published: September 2021

In this paper, a one - dimensional high order model based on a set of basic deformation modes of cross section is proposed to analyse one-dimensional dynamic model of cold-formed channel beam Considering the Deformable Cross-section. The model considers the displacement field through the linearly superimposing of 36 basis deformation modes, which stem from the discretization of the cross-section into 9 points and 8 segments. The corresponding deformation function is approximated with Hermite Interpolation. The governing equation is deduced from the principle of Hamilton, then use quadratic Lagrange interpolation for finite element realization. Numerical examples have also been presented and the comparison with ANSYS shell model showed its accuracy, efficiency, and applicability in reproducing three-dimensional behaviors of cold-formed channel beam.
Study on the bottom resistance during sinking stage of super-sized caisson foundation
Authors: Xuechao Dong , Tiechui Yang , Kongjian Shen , Mingwei Guo
Published: September 2021

Open caisson foundation sinks by overcoming the buoyancy and soil resistance by means of its own gravity and sinking auxiliary measures. Bottom resistance is a dominant variable in the sinking stage of super-sized caisson foundation. The magnitude of bottom resistance is of great importance to the safe sinking of the caisson foundation. Based on the super-sized caisson foundation of the main tower of a long-span bridge, a method is proposed for calculating the bottom resistance on the basis of the field monitoring data of earth pressure on the food blade, the bottom resistance of different zones within the bottom of the caisson foundation is calculated by the proposed method, and the distribution characteristics and variation of the bottom resistance are analyzed. The calculating results of the engineering practice show that in the process of soil sampling from the internal area to the external area within the bottom, the bottom resistance of inner bulkhead and inner partition walls decreases, while the bottom resistance of outer bulkhead and outer partition walls increases. The distribution characteristics and variation of the bottom resistance can actually reflect the global mechanical behavior of caisson foundation, which helps guide the safe sinking of the caisson.
Analysis of Coupled Vibration and Swing Characteristics of Bridge Crane
Authors: Liu Zhongye , Liu Chuntong , He Zhenxin , Gan Yuanying , Li Bojian
Published: September 2021

The vibration of the crane bridge structure and the swing of the load will cause fatigue damage to the bridge structure and affect the precise positioning of the load. The moving mass constituted by the load, the crane trolley and the flexible main girder is passed through the multi-body rigid-flexible coupling dynamics system of the bridge, and the virtual prototype of the physical model is established. The influence of the swing Angle of the load on the vibration of the main girder, the influence of the running speed of the crane trolley on the vibration of the main girder and the vertical displacement of the running trolley is simulated and analyzed. The simulation results show that the running speed of the crane car affects the vibration frequency of the bridge structure, and has little effect on the vertical displacement of the crane car. The load swing affects the vibration amplitude of the bridge structure and the vertical displacement of the crane trolley. The vibration of the main beam structure has little effect on load swing.
Design of a Flextensional Transducer with Adjustable Prestress
Authors: Fang Houlin , Liu Yang , Zhao Tianqing , Liu Yunzhe , Li Kaikai , Sun Deyu , Zhang Dezhi
Published: September 2021

Prestress has a great bearing on the performance of flextensional transducer. In order to enhance the adjustability of prestress, a design method for the flextensional transducer with adjustable prestress was proposed in this study. Through the conversion design of rotational and rectilinear motions of the transition block, the clamping length of major axis of class IV flextensional transducer shell was changed, enabling the adjustment of prestress. Next, the related experiment was further carried out. The results show that the return displacement of adjustable transition block is slightly greater than the travel displacement, and both displacements show high overlap ratios in the two tests. Because of the prestress adjustment, the frequency response of flextensional transducer is reduced to some extent, within one frequency band (40-63 Hz), but its sound pressure level (SPL) substantially increases nearby the resonant frequency (about 75 Hz).
Research on hull pressure distribution of amphibious landing on water based on RANS method
Authors: Hu Qi , Wu Bin , Wang Ming-Zhen , Huang Miao , Jiao Jun
Published: September 2021

Aiming at the strength problem of amphibious landing on water, the pressure distribution of ship bottom is studied. RANS multi-phase flow method is used to solve the coupling problem of gas, liquid and solid in the process of amphibious landing on the water surface. Overlapping grid technology is used to simulate the landing under different initial horizontal velocity and vertical velocity. The influence of initial conditions on the motion response of amphibious is analyzed, and the variation law of pressure on each section of ship bottom with time is obtained, This paper analyzes the variation of pressure with time and position, and provides technical reference for the design and application of water loads in the development of amphibious.
Research on Optimal Design and Construction Technology of Prefabricated Load-bearing Pier Structure
Authors: Chen H. , Han S.Y. , Zhang P. H. , Kang D.Y.
Published: September 2021

The prefabricated pier structure has the advantages of low energy consumption, high mechanized level, which meets the green development trend of the construction industry, with broad application prospects. This paper analyzes the process and construction principle of the prefabricated pier structure and the pier and the top platform of the prefabricated bearing pier, which describes the principle of the prefabricated bearer structure, and the structural operation of the prefabricated bearer structure, and proposed a new type of prefabricated pier structure.
The Study on Selection of Evaluation Criterion for Slope Instability
Authors: Cheng Yongfeng , Kong Xiaoang , Zhao Binbin , Liu Yi , Yang Zhi
Published: September 2021

How to select an appropriate instability evaluation criterion is a key issue in the application of the finite element strength reduction method. Commonly used evaluation criteria for slope instability mainly include non-convergence criterion of finite element numerical calculation, displacement saltation criterion at characteristic point, and penetration criterion of plastic zone. The researches on these three types of instability criteria are still continuing, but there is no uniform conclusion yet. Based on the different characteristics of the three types of instability evaluation criteria, this paper compares and analyzes the evaluation results of three criteria on the slope stability by trial calculations, and then discusses the characteristics and effectiveness of three types of instability evaluation criteria. In actual numerical calculation, it is necessary to minimize the influence of human factors and comprehensively consider the three types of instability evaluation criteria to improve the consistency of the evaluation results. when the evaluation results are inconsistent, priority should be given to the feature point displacement saltation criterion at characteristic point or penetration criterion of plastic zone. In addition, a reasonable dilatancy angle is needed to accurately consider the influence of dilatancy on slope stability.
Very High Cycle Fatigue Properties of 2024 Aluminum Alloy Samples in Three Sizes
Authors: Wang Changkai , Chen Xuan , Cheng Li , Ding Junliang , Wang Bohan
Published: September 2021

An ultrasonic fatigue testing system was used to carry out very high cycle fatigue (VHCF) tests on 2024 aluminum alloy in three different sizes of specimens. The influence of specimen size and optimization on the experimental results was discussed and the VHCF properties of 2024 aluminum alloy were obtained at the same time. The results show that: The S-N curves of all specimens show a continuous decreasing tendency and the curve of the dog-bone-shaped specimen (the half-length of the testing volume L0 > 0) is lower than that of the hourglass-shaped specimen (L0 = 0) at low-cycle and high-cycle fatigue stages, which is opposite at the VHCF stage; The optimized specimen solves the problem of fracture position deviation and effectively improves the accuracy of experimental data; 2024 aluminum alloy will still fracture when the fatigue life exceed 107, and there exist no fatigue limit; All cracks initiate at surface and the fracture morphologies show characteristics of the crack initiation and propagation.
Compact biosensors based on thin film silicon nitride microring resonators
Authors: Hong Yixiao , Ge Hua , Hong Jianxun
Published: September 2021

We presented a silicon microring resonator based on thin film silicon nitride waveguide for biosensor applications. Design and fabrication were conducted. The device was fabricated on a silicon nitride wafer with 250 nm top film on 3 μm buried oxide by using electron-beam lithography and inductively coupled plasma etching. The radius of the microring is as smaller as 50 μm. The quality factor of the resonator is 8610. The spectra and resonance shift for bulk sensing were measured by flowing sodium chloride solutions with different concentrations on the surface of the sensor. The sensitivity and the LOD of the sensor are 384.58 nm/RIU and 4.68×10−4 RIU, respectively.
A Study on the Harmfulness of Tire Fragments Impact on Panel Structure Angle and Postures
Authors: Wu Xiaoyang , Chen Qing , Zhang Ke , Wang Peiyan , Yue Zhufeng
Published: September 2021

When a tire bursts, the flying fragments may break through the wing, damage the precision instruments inside it, and cause huge economic losses. In this paper, the impact of tire fragments on the fuselage structure is simulated, and the dynamic response of the structure under different postures of impacting different structures and fragments is analyzed. The damage caused by different impact modes is analyzed and compared, the harshest impact conditions are selected, and the corresponding improvement measures are given according to the impact results. It is found that the strain of the frame truss structure is the smallest when the fragments impacts on the front side, but it may lead to the fracture of the frame truss on the back side, resulting in secondary fragments splashing. When impacting in different postures, the edge impact is the most dangerous. Although it penetrates the skin, it is very close to the failure value.
Present status and development trend of Acoustic releaser
Authors: Jianqiang Song
Published: September 2021

Acoustics releaser plays an important role in the recovery of marine surveying system. This paper analyses and introduces present situation of the acoustics releaser in our country. Finally, main technology development direction and strategy of localization are put forward in the paper. The paper mainly includes research status quo outside and in China as well as key technical problems in design of underwater acoustic releasers.
The integral of complex variables on three defined contours
Authors: Li Hankun , Wang Weiyue , Zhang Yuhan
Published: September 2021

Complex variables have aroused strong interest in the community of mathematics in the past few decades. Our aim is to obtain the integral results of a particular equation

f
(
Z
)
=

z
3

+
(
1
+
2

i
)
z

2

−
7
z
+
1
−
2
i

z
4

−
1

,

in three defined contours. To determine the value of integral, the information we need to find is the residue values ABCD on four specific points and find out what residue values each contour includes. After finding the residue values and analysing four contours, we should use Cauchy integral formula to find the integral value. Firstly, by using the partial fraction to separate the equation into four independent parts, we obtain four values on each of the four fractions are the value of integral. Thus we can find exactly the four residue values, which are -1 on (1,0), 3 on (0,i), -2 on (-1.0) and 1 on (-I,0) as shown in the following expression.

f(Z)=

z
3

+
(
1
+
2

i)z

2

−
7
z
+
1
−
2
i

z
4

−
1

=

−
1

Z
−
1

+

3

Z
−
i

+

−
2

Z
+
1

+

1

Z
+
i

,

and then we must analyse each contour and find out the residue values they include. By drawing a diagram of each of the three contours. We find that contour 1 contains A, contour 2 contains A and D, and contour 3 contains ABCD. The final step to obtaining the value of residue is to use Cauchy integral formula

∫

y

f
(
z
)
d
z

=
2
π
i

∑

k
=
1

n

Res

f
(
z
)

.

According to Cauchy integral formula, the value of integral of the equation on a specific contour is obtained by multiplying the sum of the residue values included in that contour by 2πi, the value of integral of the equation can be found as we now have all the necessary information. For the first contour

y
(
t
)
=
1
+

e

i
t

,

where

0
≤
t
≤
2
π
,

the value of integral is calculated by using 2πi multiply by -1. We can get the result -2πi. For the second contour

y
(
t
)
=

1
−
i

2

+

2

e

i
t

,

where

0
≤
t
≤
2
π
,

the value of integral is calculated by using 2πi multiply by the sum of -1 and 1. As we can see, the sum is 0. We can get the result 0. For the third contour

y
(
t
)
=
2

e

i
t

,

where

0
≤
t
≤
2
π
,

the value of integral is calculated by using 2πi multiply by the sum of -1,3, -2, and 1.

As we can see, the sum of these residue values 1. We can get the result 2πi. Hence all of the values of integral of the equation

f
(
z
)
=

z
3

+
(
1
+
2

i)z

2

−
7
z
+
1
−
2
i

z
4

−
1

,

is found.
Derivation and classical solutions for the Wave equation
Authors: Ji Chunyu , Li Kaiyang , Liu Qiyuan
Published: September 2021

The problem of string vibration prompted mathematicians to find a suitable equation to express this phenomenon, which led to the birth of the Fourier series and integrals. The physical law of string vibration can be expressed by wave equation and solved by Fourier series. The study on the wave equation is fraught with mathematical and physical controversy. D.Bernoulli based on results from physical experiments to make a bold conjecture that the shape of a vibrating string can be described as a combination of trigonmetric series, which was inspired and validated by work from Fourier on study on heat equation. This study reviews the wave equation using Fourier as a tool. This paper not only gives the derivation of the wave equation but also explores its solution and corresponding properties.
A note on the entire functions: theorems, properties and examples
Authors: Huo Xiaodan , Zhan Yufei
Published: September 2021

In this work, we summarized several fundamental theorems of the entire functions and explored how their zeros determine those functions. The background of this work is based on Elias M. Stein and Rami Shakarachi, and their lectures about functions that are holomorphic in the whole complex plane that once were taught at Princeton University. First, we introduced Jensen’s formula and gave detailed proof. This relates the values of a meromorphic function inside a disk with its boundary values on the circumference and with its zeros and poles. Next, we studied the proof of Weierstrass infinite products and the definition of canonical factors. Last, Hadamard’s factorization theorem and a few main lemmas were introduced. We showed the proof of the Hadamard factorization theorem and solved its several applications through using examples. Hadmard’s theory is well demonstrated in this article, and we showed the rigor and scientific validity of the theory through examples.
Mathematical Modeling of Traffic
Authors: Sun Jiayang
Published: September 2021

This mathematical exploration is around the topic of traffic. Traffic is a constant problem for many small and large cities with a significant population density and costs people efficiency. Traffic congestion adversely impacts metropolitan cities’ living standards, reflecting on travelers’ time cost, the number of resulting accidents, and trivially fuel consumption. Therefore good transportation is called for contributions everywhere today in the modern world. In this essay, mathematical theory is used to integrate the most influential cause - the culprit of traffic congestions.
Research on Regional Innovation Capability Based on Grey Relation Analysis
Authors: Wang Junchuan , Zou Du
Published: September 2021

Regional innovation ability evaluation is a powerful engine to promote high-quality economic development, and also an important part of the strategy ofstrengthening the province through innovation. In this paper, the regional innovation capacity evaluation index system is constructed from three dimensions of regional innovation input, regional innovation environment and regional innovation output. By using the grey correlation analysis method, the regional innovation capacity of 13 cities and states in Hubei Province in 2019 is evaluated and ranked. The results show that the regional innovation capacity of Hubei Province is roughly distributed in ladder shape. In this paper, 13 cities and prefectures in Hubei province are divided into three levels, and some suggestions are put forward to improve the overall ability of scientific and technological innovation and to balance the development of regional innovation in Hubei province.