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Alkyl polyglycoside: a green and efficient surfactant for enhancing heavy oil recovery at high-temperature and high-salinity condition

Alkyl polyglycoside (APG) is a green surfactant with excellent interfacial activity, emulsified ability, foaming performance and wettability, which has great potential in enhancing heavy oil recovery at high-temperature and high-salinity condition. In this paper, surface tension, interfacial tension, emulsifying ability, emulsion stability and emulsified oil droplet size were...

SU(3) analysis of weak decays of doubly-heavy tetraquarks \({b\bar{c}}{q\bar{q}}\)

We study the weak decays of exotic tetraquark states \({b\bar{c}}{q\bar{q}}\) with two heavy quarks. Under the SU(3) symmetry for light quarks, these tetraquarks can be classified into an octet plus a singlet: \(3\bigotimes \bar{3}=1\bigoplus 8\). We will concentrate on the octet tetraquarks with \(J^{P}=0^{+}\), and study their weak decays, both semileptonic and nonleptonic...

Production of \(Z_c(3900\) ) and \(Z_c(4020)\) in \(B_c\) decay

In the present work, we propose to search the charmonium-like states \(Z_c(3900\)) and \(Z_c(4020)\) in the \(B_c\) decay. In an effective Lagrangian approach, the branching ratios of \(B_c^+ \rightarrow Z_c(3900)^+ \pi ^0\) and \(B_c^+\rightarrow Z_c (4020)^+ \pi ^0\) are estimated to be of order of \(10^{-4}\) and \(10^{-7}\), respectively. The large production rate of \(Z_c...

On a nonstationary nonlinear coupled system

In this paper, a strongly nonlinear coupled elliptic-parabolic system modelling a class of engineering problems with heat effect is studied. Existence of a weak solution is first established by Schauder fixed point theorem, where the coupled functions σ(s), k(s) are assumed to be bounded. The uniqueness of the solution is obtained by applying Meyers' theorem and assuming that σ(s...

The decays of \(\bar{B}^0\) , \(\bar{B}^0_s\) and \(B^-\) into \(\eta _c\) plus a scalar or vector meson

We investigate the decays of \(\bar{B}^0_s\), \(\bar{B}^0\) and \(B^-\) into \(\eta _c\) plus a scalar or vector meson in a theoretical framework by taking into account the dominant process for the weak decay of \(\bar{B}\) meson into \(\eta _c\) and a \(q\bar{q}\) pair. After hadronization of this \(q\bar{q}\) component into pairs of pseudoscalar mesons we obtain certain weights...

Searching for a charged Higgs boson with both H±W∓Z and H±tb couplings at the LHC

Abstract In certain new physics scenarios, a singly charged Higgs boson can couple to both fermions and W±Z at tree level. We develop new strategies beyond current experimental searches using pp → jjH±, H± → tb at the Large Hadron Collider (LHC). With the effective H±W∓Z and H±tb couplings we perform a model-independent analysis at the collision energy \( \sqrt{s}=13 \) TeV with...

Nonlinear ergodic theorems for asymptotically almost nonexpansive curves in a Hilbert space

supported by Korea Research Foundation Grant (KRF-99-041-D00025). Gang Li: Department of Mathematics, Yangzhou University, Yangzhou 225002, China E-mail address: Jong Kyu Kim: Department of Mathematics

Remote sensing classification method of vegetation dynamics based on time series Landsat image: a case of opencast mining area in China

Time series remote sensing image is an important resource for dynamic monitoring of resources and environment, and its abundant time spectrum information can be used to characterize the dynamic change of vegetation coverage. This paper proposes a comprehensive clustering and pixel classification method for extracting the vegetation dynamics based on time series Landsat normalized...

Nonlinear ergodic theorems for asymptotically almost nonexpansive curves in a Hilbert space

supported by Korea Research Foundation Grant (KRF-99-041-D00025). Gang Li: Department of Mathematics, Yangzhou University, Yangzhou 225002, China E-mail address: Jong Kyu Kim: Department of Mathematics

Impaired function of tendon-derived stem cells in experimental diabetes mellitus rat tendons: implications for cellular mechanism of diabetic tendon disorder

BackgroundPatients with diabetes mellitus (DM) often suffered with many musculoskeletal disorders, such as tendon rupture and tendinopathy. However, the understanding of the pathogenesis of these alternations is limited. This study was designed to investigate the role of tendon-derived stem cells (TDSCs) in histopathological alterations of DM tendons.MethodsForty-two SD rats were...

Involvement of tumor necrosis factor alpha in steroid-associated osteonecrosis of the femoral head: friend or foe?

BackgroundThe etiology and pathology osteonecrosis of the femoral head (ONFH) are not completely clarified. As a cytokine participating in systemic inflammation, tumor necrosis factor alpha (TNFα) has been shown to be involved in the pathogenesis of ONFH. However, the role of TNFα in ONFH is not clearly clarified. In the present study, we investigated the effects of TNFα on...

Natural Dissociation Ratio of Carboxyl Group Controlled Highly Dispersed Silver Nanoparticles on PSA Microspheres and Their Catalytic Performance

The highly dispersed silver nanoparticle-loaded poly(styrene-co-acrylic acid) nanocomposites (nAg@PSA) were prepared and characterized by transmission electron microscopy and thermogravimetry. The amount and distribution of colloidal silver per particle were related to the dissociation ratio of carboxyl groups in the PSA sphere. The amount of carboxyl groups was evaluated by a...

Repair of osteonecrosis of the femoral head

Osteonecrosis of the femoral head PBS Phosphate-buffered saline RH Relative humidity SEM Scanning electron microscope The authors Ping Wang, Gang Li and Wen Qin contributed equally to the manuscript

Advances in Processing, Mining, and Learning Complex Data: From Foundations to Real-World Applications

manuscripts submitted to this special issue collection and their many insightful comments and suggestions. Jia Wu Shirui Pan Chuan Zhou Gang Li Wu He Chengqi Zhang References M. Shi, J. Liu, D. Zhou, and

Advances in Processing, Mining, and Learning Complex Data: From Foundations to Real-World Applications

manuscripts submitted to this special issue collection and their many insightful comments and suggestions. Jia Wu Shirui Pan Chuan Zhou Gang Li Wu He Chengqi Zhang References M. Shi, J. Liu, D. Zhou, and

Experimental Investigation on Cooling/Heating Characteristics of Ultra-Thin Micro Heat Pipe for Electric Vehicle Battery Thermal Management

, China, in 1998. Her research interests include lightweight and crashworthiness design of car body structure, simula? tion and theory of occupant?s thermal comfort. Yi-Gang Li, born in 1989, is currently

Seed-Mediated Synthesis of Tunable-Aspect-Ratio Gold Nanorods for Near-Infrared Photoacoustic Imaging

Tunable-aspect ratio gold nanorods have been synthesized by a modified seed-mediated synthesis method. Ascorbic acid was employed as a shape controller to induce anisotropic growth, which made the aspect ratio of the synthesized gold nanorods range from 8.5 to 15.6. These nanorods possess tunable longitudinal surface plasmon resonance absorption band, covering a broad near...

A novel magnet-actuated droplet manipulation platform using a floating ferrofluid film

In this paper, we propose a novel but versatile magnet-actuated platform for droplet manipulation, which uses a ferrofluid film floating on a liquid surface as magnetic actuator. In contrast to the traditional magnetic droplet manipulation, this platform can handle droplets without magnetically functionalizing them. Due to the immiscibility of the oil-based ferrofluid and water...

Weight underestimation for adults in Beijing and its association with chronic disease awareness and weight management

Obesity is known to be a risk factor to a variety of chronic diseases. Weight misperception has an impact on weight-loss attitude and behavior. We aimed to investigate factors associated with weight underestimation, and to assess the effect of hypertension, diabetes and dyslipidemia awareness on weight underestimation and weight management for overweight and obese adults. Data...