bluuebunny/crossref_metadata_2025_split huggingface dataset:
A foot in the door: Field experiments on entrepreneurs' network activation strategies for investor referrals
Authors: Nai Jared , Lin Yimin , Kotha Reddi , Vissa Balagopal 
Published: September 2021

AbstractResearch summaryWe investigate entrepreneurial network activation—the processes by which entrepreneurs select specific contacts from their existing personal network and persuade the selected contacts to provide referrals to access targeted early‐stage investors (venture capitalists or angel‐investors). We differentiate between selection of entrepreneur‐centric contacts versus investor‐centric contacts. We also distinguish between persuasion tactics that induce contacts' cooperation through promises of reciprocity versus offers of monetary incentives. We conducted two field‐experiments in India and one in Singapore. Our primary field‐experiment involved 42 Singapore‐based entrepreneurs seeking referrals from 684 network contacts to reach a panel of four investors. Our evidence suggests that selecting investor‐centric contacts leads to greater referral success; in addition, persuasion by promising reciprocity also leads to greater referral success.Managerial summaryA vital first‐step for resource‐starved entrepreneurs seeking funding for their scalable business‐idea is to obtain referrals to early‐stage investors, because such investors pay more attention to referrals from trusted contacts. Using field‐experiments, we examine how entrepreneurs' choices in selecting network contacts and persuading them to provide referrals drive their access to investors. Results suggest that compared with the habitual pattern of requesting referrals from contacts proximate to themselves, entrepreneurs are about six times more likely to secure successful referrals when they select investor‐centric contacts for referral requests. Furthermore, actively persuading contacts by promising future reciprocity results in about three times higher likelihood of securing successful referrals. Our findings show how thoughtful activation of existing contacts can enable even modestly connected entrepreneurs to gain investor access.
In Situ Construction of Aramid Nanofiber Membrane on Li Anode as Artificial SEI Layer Achieving Ultra‐High Stability
Authors: Zheng Shuai , Zhang HaiYan , Fan JinChen , Xu QunJie , Min YuLin 
Published: September 2021

AbstractAchieving uniform Li deposition is vital for the construction of a safe but also efficient Li‐metal anode for Li‐metal batteries (LMBs). Herein, a facile coating strategy is used for forming an ultra‐thin aramid nanofiber (ANF) membrane, with a network structure, on a Li anode (ANF‐Li) as an artificial layer inhibiting Li dendrite's growth. The results show that under an ultra‐high current density of 50 mA cm−2, the ANF‐Li|ANF‐Li symmetric cells can be kept stably cycled for a period exceeding 300 h. The ANF‐Li|LiFePO4 full cells exhibit a high‐capacity retention of 80.1% after 1200 cycles at 1 C, showing a promising potential for LMBs application. Combined experimental results with theoretical calculations, the excellent performance of the ANF‐Li anode is explored. Lithiophilic polar functional groups (CO, NH) appear in the surface and structure of ANF membrane, which offer high‐concentration functional sites for the Li ions to realize an effective adhesion at the molecular level. This work also finds fiber‐shaped lithium deposition for the first time. Furthermore, the nanoscale porosity of the ANF membrane not only provides fast pathways and channels for the diffusion of the electrolyte and Li transportation, but also eliminates the “weak links” of micron‐scale Li dendrites penetrating the membrane.
Inorganic Hollow Nanocoils Fabricated by Controlled Interfacial Reaction and Their Electrocatalytic Properties
Authors: Moon Jun Hwan , Lee Moo Young , Park Bum Chul , Jeon Yoo Sang , Kim Seunghyun , Kim Taesoon , Ko Min Jun , Cho Kang Hee , Nam Ki Tae , Kim Young Keun 
Published: September 2021

AbstractThe fabrication of 3D hollow nanostructures not only allows the tactical provision of specific physicochemical properties but also broadens the application scope of such materials in various fields. The synthesis of 3D hollow nanocoils (HNCs), however, is limited by the lack of an appropriate template or synthesis method, thereby restricting the wide‐scale application of HNCs. Herein, a strategy for preparing HNCs by harnessing a single sacrificial template to modulate the interfacial reaction at a solid–liquid interface that allows the shape‐regulated transition is studied. Furthermore, the triggering of the Kirkendall effect in 3D HNCs is demonstrated. Depending on the final state of the transition metal ions reduced during the electrochemical preparation of HNCs, the surface states of the binding anions and the composition of the HNCs can be tuned. In a single‐component CrPO4 HNC with a clean surface, the Kirkendall effect of the coil shape is analyzed at various points throughout the reaction. The rough‐surface multicomponent MnOxP0.21 HNCs are complexed with ligand‐modified BF4‐Mn3O4 nanoparticles. The fabricated nanocomposite exhibits an overpotential decrease of 25 mV at neutral pH compared to pure BF4‐Mn3O4 nanoparticles because of the increased active surface area.
Ion‐Inserted Metal–Organic Frameworks Accelerate the Mass Transfer Kinetics in Lithium–Sulfur Batteries
Authors: Zhou Mingjie , Li Yaoyao , Lei Tianyu , Chen Wei , Rao Gaofeng , Xue Lanxin , Hu Anjun , Fan Yuxin , Huang Jianwen , Hu Yin , Wang Xianfu , Xiong Jie 
Published: September 2021

AbstractLithium–sulfur battery promises great potential to promote the reform of energy storage field. Modified functional interlayer on separator has been recognized as efficient method to promote battery performances, mainly focusing on the entrapment and catalytic effect toward lithium polysulfide, while the mass transfer property across the interlayers has not been carefully considered. Herein, a dense layer composed of ion‐inserted metal–organic frameworks is used to facilitate mass transfer across the layer and ensure high polysulfides entrapment efficiency. In situ Raman study reveals that the dense functional layer blocks the transfer of Li ions, while the ion‐inserted layer can accelerate the ion‐transfer kinetics and avoid the ion depletion caused polarization. As a result, a specific capacity of 742 mAh g−1 is obtained at 2 C, with the decay rate of 0.089% per cycle at 1 C over 600 cycles, demonstrating great potential for the application in advanced Li–S batteries.
Strategies to improve electrochemical performances of pristine metal‐organic frameworks‐based electrodes for lithium/sodium‐ion batteries
Authors: Liu Zhoujia , Zheng Fenfen , Xiong Weiwei , Li Xiaogang , Yuan Aihua , Pang Huan 
Published: September 2021

AbstractMetal‐organic frameworks (MOFs) have attracted considerable attention as promising next‐generation active electrode materials for lithium‐ion batteries (LIBs) or sodium‐ion batteries (SIBs) because of ultrahigh specific surface area, uniformly distributed pores, and tunable structure. However, there are some disadvantages inevitably far from meeting commercial requirements, such as low conductivity, inconvenient electron transmission, and unsatisfactory circulation stability. In this review, a comprehensive summary of MOFs‐based electrode materials is presented and discussed. First, the general Li+/Na+ storage mechanism in MOFs‐based electrode materials, including conversion‐ and insertion‐type reactions, are summarized with details of active inorganic/organic ligands. Second, MOFs as anode materials for LIBs/SIBs are emphasized and improved on the electrochemical performances. Furthermore, very few research literature on MOFs‐based cathode materials is also discussed. Finally, opinions and prospects on the current challenge of MOFs‐based electrode materials are provided for future research directions.
Structural and Biochemical Characterization of a Polysaccharide Isolated From Vaccinium uliginosum L
Authors: Li Xingguo , Wang Xiaotian , Guo Xue , Li Dalong , Huo Junwei , Yu Zeyuan 
Published: September 2021

AbstractA novel polysaccharide (VUP‐1) from Vaccinium uliginosum L. fruits is isolated using polyamide resin and Sephadex G‐100 column chromatography. VUP‐1 is a heteropolysaccharide, which is composed of mannose, galacturonic acid, galactose, glucose, and arabinose at a molar ratio of 1.00:3.35:7.99:8.38:11.89 with a molecular weight of 4.98 × 104 kDa. The glycosyl linkages of (1→5)‐α‐L‐Arabinose, (1→4)‐β‐D‐Galactose, (1→6)‐α‐D‐Galactose, (1→6)‐α‐D‐Glucose, and (1→4)‐β‐D‐Mannose are confirmed by nuclear magnetic resonance. Based on scanning electron microscopy and Congo red assays, VUP‐1 shows flake‐like structures, but no triple helix structure. VUP‐1 presents high antioxidant activities (DPPH•, OH•, and reducing power) and moderate α‐amylase inhibitory activity. Scavenging rate of VUP‐1 on DPPH• and OH• are 93.86 ± 0.59% and 48.58 ± 0.64%, respectively. Reducing power of VUP‐1 reached 1.14 ± 0.05. Inhibition rate of α‐amylase is 37.23 ± 0.45% when VUP‐1 concentration is 4.0 mg mL‒1. In addition, VUP‐1 shows obvious inhibitory activities on the formation of dicarbonyl compounds (42.10±0.61%) and improved glycation end products (45.93±1.27%) compared to that of Amadori products (29.91±0.78%). This study concludes that polysaccharides from Vaccinium uliginosum L. have potential to be used as oral hypoglycemic agents.
The Copper Chemical Garden as a Low Cost and Efficient Material for Breaking Down Air Pollution by Gaseous Ammonia
Authors: Castellini Elena , Bernini Fabrizio , Sebastianelli Lorenzo , Bighi Beatrice , Ignacio Sainz‐Díaz Claro , Mucci Adele , Malferrari Daniele , Ranieri Antonio , Gorni Giulio , Marini Carlo , Franca Brigatti Maria , Borsari Marco 
Published: September 2021

AbstractChemical garden (CG) from copper(II) sulfate, nitrate and chloride (CG CuSO4, CG Cu(NO3)2, CG CuCl2) were grown, and characterized from the structural and compositional point of view by using scanning electron microscopy, X‐ray powder diffraction, elemental analysis, thermogravimetric analysis coupled with mass spectrometry, and DR (diffuse reflectance) UV‐Vis‐NIR spectroscopy. The main crystalline phases, controlled by the anion of the starting salt, were brochantite and kobyashevite for CG CuSO4, gerhardtite, rouaite and anthonyite for CG Cu(NO3)2, and atacamite for CG CuCl2. The materials were then exposed to ammonia vapors to test the effectiveness of their entrapping property. All materials proved to be very efficient and rapid in the uptake of ammonia, which invariably results in the formation of a Cu(II)/NH3 complex. However, after a few tens of minutes, CG Cu(NO3)2 and CG CuCl2 release water and get wet, thereby resulting unsuitable for applications. Only CG CuSO4 remains dry for at least 25 hours. This makes it a valid candidate for building devices for trapping ammonia, and possibly other gases capable of interacting with Cu(II). The entrapment of ammonia by this material was also characterized by 1H and 29Si MAS‐NMR XAS spectroscopies.
Vascular characteristics and expression of hypoxia genes in Tibetan pigs’ hearts
Authors: Yang Yanan , Gao Caixia , Yang Tianliang , Sha Yuzhu , Cai Yuan , Wang Xinrong , Yang Qiaoli , Liu Chengze , Wang Biao , Zhao Shengguo 
Published: September 2021

AbstractBackgroundTibetan pigs have exhibited unique characteristics from low‐altitudes pigs and adapted well to the Qinghai‐Tibet Plateau.ObjectivesThe current study was undertaken to investigate the hypoxic adaptation of heart in Tibetan pigs.MethodsThe hearts of Tibetan pigs and Landrace pigs raised at high or low altitudes were compared using 3D casting technology, scanning electron microscopy and real‐time quantitative PCR (qRT‐PCR).ResultsWe found that the ratio of the major axis to the minor axis and the density of the heart were significantly higher in Tibetan pigs than in Landrace pigs (p < 0.05). Tibetan pigs had larger diameters and higher densities of arterioles than Landrace pigs (p < 0.05), and these features have a similar variation with the expression of vascular endothelial growth factor (VEGF). The cardiac expression levels of hypoxia‐inducible factor‐1α (HIF‐1α) and endothelial nitric oxide synthase (eNOS) were significantly higher in pigs reared at high altitudes than in those reared at low altitudes (p < 0.05). In contrast, Egl nine homolog 1 (EGLN1) had the opposite trend with respect to HIF‐1α and eNOS and was related to red blood cell (RBC) counts. Notably, the expressions of erythropoietin (EPO) and endothelial PAS domain‐containing protein 1 (EPAS1) were significantly higher in Landrace pigs kept at high altitudes than in the others (p < 0.05) and were associated with haemoglobin.ConclusionsThese findings show that the regulation of the heart function of Tibetan pigs in a hypoxic environment is manifested at various levels to ensure the circulation of blood under extreme environmental conditions.
Thermal effects and initial stress on magneto‐thermo‐viscoelastic medium with two temperature under five theories
Authors: Alharbi Amnah M. , Atef Haitham M. , Othman Mohamed I. A. 
Published: September 2021

AbstractThe contribution of this study is to research how the initial stress and the application of a magnetic field affects the two‐dimensional complication of a general, two temperature, and thermally activated viscoelastic material in five theories. In the physical domain, normal mode analysis is employed to obtain the analytical expressions for the physical quantities. A numerical pathway is chosen to calculate the analytical expressions and their explanation is done using various graphical methods. The results predicted by different theories (L‐S, G‐L, G‐N II, and DPL) are also examined in both the scenarios, that is, existence and non‐existence of a magnetic field, viscosity, initial stress, and two temperatures.
Elastic buckling and free vibration of nonlocal strain gradient Euler‐Bernoulli beams using Laplace transform
Authors: Bian Pei‐Liang , Qing Hai 
Published: September 2021

AbstractPrevious studies have shown that Lim's nonlocal strain gradient differential model would lead to some inconsistencies for the static bending of Bernoulli‐Euler and Timoshenko beams, though it is widely applied to address both softening and toughening size‐effect. In this work, nonlocal strain gradient integral model is applied to study the elastic buckling and free vibration of Bernoulli‐Euler beam under different boundary conditions. The differential governing equation and corresponding boundary conditions are derived via the Hamilton's principle, and the relation between strain and nonlocal stress is expressed in integral form. The Laplace transform technique is applied to solve the integro‐differential equations directly, and the explicit expression for bending deflections and moments is obtained with six unknown constants. The nonlinear characteristic equations to determine the characteristic buckling load and vibration frequency are derived explicitly in consideration of corresponding boundary conditions. The buckling load and vibration frequency from present model are validated against to the existed results in literature. Consistent softening and toughening responses respect to length‐scale parameters can be obtained for both elastic buckling and free vibration.
Conclusion
Authors: Rey Emmanuel , Laprise Martine , Lufkin Sophie 
Published: September 2021

AbstractThe inventory of urban brownfields in post-industrial European metropolitan areas and the study of regeneration projects highlight the absolute necessity of these resources for the sustainability transitions of urban territories and the undeniable complexity of this type of process. Given the complexity of the variables involved, there is no simple and unambiguous recipe to make urban territories evolve towards more sustainability. In a synthetic way, we recall how this book examines the strategies and methods of regenerating urban brownfields through the lens of sustainability at the neighbourhood scale. Then, we question how the urban brownfield phenomenon will evolve in the decades to come. Finally, we argue that it is through inter-disciplinarity of approaches that neighbourhoods in transition can contribute, on their scale, to the mutation and adaptability of urban territories.
Sustainability Issues at the Neighbourhood Scale
Authors: Rey Emmanuel , Laprise Martine , Lufkin Sophie 
Published: September 2021

AbstractWe previously identified that urban brownfield regeneration projects are relevant strategies to limit urban sprawl while revitalizing portions of cities, namely mixed-use neighbourhoods. Moreover, these neighbourhoods in transition are opportunities to foster the implementation of sustainability objectives within European metropolitan areas. This chapter explore this subject by deepening the sustainability issues at the neighbourhood scale. To provide the basis for discussion, we first attempt to frame the urban sustainability concept and to explain how the neighbourhood scale is a means of action for cities. Then, we analyse the different sustainability issues according to a wide variety of parameters that must especially be taken into account during sustainable neighbourhood projects, and more precisely urban brownfield regeneration projects. These parameters cover the four pillars of sustainability—the environment, society, economy, and governance—and the polycentric reorganization of European metropolitan areas.
Key Steps of a Regeneration Process
Authors: Rey Emmanuel , Laprise Martine , Lufkin Sophie 
Published: September 2021

AbstractBecause of their inherent complexity, urban brownfield regeneration projects are long-term operations. The study of the evolution from urban brownfield site to a new—and ideally sustainable—neighbourhood through a regeneration process has led to the identification of five key steps: Backgrounds, Initiators, Guidelines, Legal Basis, and Realization. This chapter highlights the specific issues encountered during these different steps. Thus, our early reflections on the future of an urban brownfield at the regional and metropolitan levels concern the Background and Initiator steps. The formulation of a coherent project to overcome negative perception and foster a shared vision relates to the Guidelines steps. The transition from the urban to the architectural project is dealt with during the Legal Basis and Realization steps. Finally, issues concerning the multiple forms of participatory processes and the evaluation of sustainability objectives must be taken into consideration throughout the regeneration process. These reflections provide a foundation for developing a series of measures and more concrete lines of action.
Specific Skills and Adapted Support
Authors: Rey Emmanuel , Laprise Martine , Lufkin Sophie 
Published: September 2021

AbstractAlthough urban brownfields hold significant inherent potential, especially in limiting urban sprawl, a large number of sites are still awaiting a regeneration project. Moreover, many of these projects only partially or superficially address sustainability principles. Hence, concrete courses of action are required to support the evolution of current practices towards increased sustainability. These courses of action, which rely on specific skills and adapted supports, require a complementary approach. In other words, strategies should be conducted consistently at the territorial, metropolitan, and project levels. In this regard, the present chapter provides a series of courses of action to be implemented at these levels. Our aim here is to foster the sustainable transition of metropolitan areas, and more precisely brownfield sites, into lively neighbourhoods.
Two-loop mass anomalous dimension in reduced quantum electrodynamics and application to dynamical fermion mass generation
Authors: Metayer S. , Teber S. 
Published: September 2021

Abstract
We consider reduced quantum electrodynamics ($$ {\mathrm{RQED}}_{d_{\gamma },{d}_e} $$

RQED

d
γ

,

d
e

) a model describing fermions in a de-dimensional space-time and interacting via the exchange of massless bosons in dγ-dimensions (de ≤ dγ). We compute the two-loop mass anomalous dimension, γm, in general $$ {\mathrm{RQED}}_{4,{d}_e} $$

RQED

4
,

d
e

with applications to RQED4,3 and QED4. We then proceed on studying dynamical (parity-even) fermion mass generation in $$ {\mathrm{RQED}}_{4,{d}_e} $$

RQED

4
,

d
e

by constructing a fully gauge-invariant gap equation for $$ {\mathrm{RQED}}_{4,{d}_e} $$

RQED

4
,

d
e

with γm as the only input. This equation allows for a straightforward analytic computation of the gauge-invariant critical coupling constant, αc, which is such that a dynamical mass is generated for αr> αc, where αr is the renormalized coupling constant, as well as the gauge-invariant critical number of fermion flavours, Nc, which is such that αc → ∞ and a dynamical mass is generated for N < Nc. For RQED4,3, our results are in perfect agreement with the more elaborate analysis based on the resolution of truncated Schwinger-Dyson equations at two-loop order. In the case of QED4, our analytical results (that use state of the art five-loop expression for γm) are in good quantitative agreement with those obtained from numerical approaches.
Flavoured axions in the tail of Bq → μ+μ− and B → γ* form factors
Authors: Albrecht Johannes , Stamou Emmanuel , Ziegler Robert , Zwicky Roman 
Published: September 2021

Abstract
We discuss how LHC di-muon data collected to study Bq → μμ can be used to constrain light particles with flavour-violating couplings to b-quarks. Focussing on the case of a flavoured QCD axion, a, we compute the decay rates for Bq → μμa and the SM background process Bq → μμγ near the kinematic endpoint. These rates depend on non-perturbative Bq → γ(*) form factors with on- or off-shell photons. The off-shell form factors — relevant for generic searches for beyond-the-SM particles — are discussed in full generality and computed with QCD sum rules for the first time. This includes an extension to the low-lying resonance region using a multiple subtracted dispersion relation. With these results, we analyse available LHCb data to obtain the sensitivity on Bq → μμa at present and future runs. We find that the full LHCb dataset alone will allow to probe axion-coupling scales of the order of 106 GeV for both b → d and b → s transitions. As a spin-off application of the off-shell form factors we further analyse the case of light, Beyond the Standard Model, vectors.
A semi-analytic method to compute Feynman integrals applied to four-loop corrections to the $$ \overline{\mathrm{MS}} $$-pole quark mass relation
Authors: Fael Matteo , Lange Fabian , Schönwald Kay , Steinhauser Matthias 
Published: September 2021

Abstract
We describe a method to numerically compute multi-loop integrals, depending on one dimensionless parameter x and the dimension d, in the whole kinematic range of x. The method is based on differential equations, which, however, do not require any special form, and series expansions around singular and regular points. This method provides results well suited for fast numerical evaluation and sufficiently precise for phenomenological applications. We apply the approach to four-loop on-shell integrals and compute the coefficient function of eight colour structures in the relation between the mass of a heavy quark defined in the $$ \overline{\mathrm{MS}} $$

MS
¯

and the on-shell scheme allowing for a second non-zero quark mass. We also obtain analytic results for these eight coefficient functions in terms of harmonic polylogarithms and iterated integrals. This allows for a validation of the numerical accuracy.