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1.
Opt Express ; 30(4): 5879-5895, 2022 Feb 14.
Artigo em Inglês | MEDLINE | ID: mdl-35209541

RESUMO

Plasmonic sensing that enables the detection of minute events, when the incident light field interacts with the nanostructure interface, has been widely applied to optical and biological detection. Implementation of the controllable plasmonic double Fano resonances (DFRs) offers a flexible and efficient way for plasmonic sensing. However, plasmonic sensing and digital metasurface induced by tailorable plasmonic DFRs require further study. In this work, we numerically and theoretically investigate the near-infrared plasmonic DFRs for plasmonic sensing and digital metasurface in a hybrid metasurface with concentric ϕ-shaped-hole and circular-ring-aperture unit cells. We show that a plasmonic Fano resonance, resulting from the interaction between a narrow and a wide effective dipolar modes, can be realized in the ϕ-shaped hybrid metasurface. In particular, we demonstrate that the tailoring plasmonic DFRs with distinct mechanisms of actions can be accomplished in three different ϕ-shaped hybrid metasurfaces. Moreover, the resonance mode-broadening and mode-shifting plasmonic sensing can be fulfilled by modulating the polarization orientation and the related geometric parameters of the unit cells in the near-infrared waveband, respectively. In addition, the plasmonic switch with a high ON/OFF ratio can not only be achieved but also be exploited to establish a single-bit digital metasurface, even empower to implement two- and three-bit digital metasurface characterized by the plasmonic DFRs in the telecom L-band. Our results offer a new perspective toward realizing polarization-sensitive optical sensing, passive optical switches, and programmable metasurface devices, which also broaden the landscape of subwavelength nanostructures for biosensors and optical communications.

2.
Insect Mol Biol ; 31(2): 127-138, 2022 04.
Artigo em Inglês | MEDLINE | ID: mdl-34738680

RESUMO

Insects prevent uncontrolled penetration of water and xenobiotics by producing an impermeable cuticle. The major component of the cuticle is chitin that adopts a crystalline structure thereby contributing to cuticle stability. Our understanding of the contribution of chitin to the cuticle barrier function is limited. Here, we studied the role of the DOMON domain protein Knickkopf (LmKnk) that is involved in chitin organization and cuticle permeability in the migratory locust Locusta migratoria. We show that LmKnk localizes to the chitin layer in the newly produced cuticle. Injection of double-stranded RNA targeting LmKnk (dsLmKnk) in locust nymphs caused failure of moulting to the next stage. Histological experiments revealed that apolysis, i.e., the detachment of the old cuticle from the body surface, was normal; however, the newly synthesized cuticle was thinner than the cuticle of the control insects. Indeed, chitin content dropped after suppression of LmKnk expression. As seen by transmission electron microscopy, crystalline chitin organization was lost in dsLmKnk-treated insects. In addition, the structure of pore canals, which are lipid transporting routes in the cuticle, was abnormal. Consistently, their content was reduced and, probably by consequence, lipid deposition on the cuticle was decreased after injection of dsLmKnk. Suppression of LmKnk transcript levels rendered L. migratoria more susceptible to each of four selected insecticides including malathion, chlorpyrifos, carbaryl and deltamethrin. Overall, our data show that LmKnk is needed for correct chitin amounts and organization, and their changes ultimately affect cuticular permeability in L. migratoria.


Assuntos
Locusta migratoria , Animais , Quitina/metabolismo , Proteínas de Insetos/metabolismo , Lipídeos , Locusta migratoria/genética , Locusta migratoria/metabolismo , Muda/genética
3.
Anaesthesia ; 77(1): 46-53, 2022 01.
Artigo em Inglês | MEDLINE | ID: mdl-34182603

RESUMO

Whether high-flow vs. low-flow nasal oxygen reduces hypoxaemia for sedation during endoscopic retrograde cholangiopancreatography is currently unknown. In this multicentre trial, 132 patients ASA physical status 3 or higher, BMI > 30 kg.m-2 or with known or suspected obstructive sleep apnoea were randomly allocated to high-flow nasal oxygen up to 60 l.min-1 at 100% FI O2 or low-flow nasal oxygen at 4 l.min-1 . The low-flow nasal oxygen group also received oxygen at 4 l.min-1 through an oxygenating mouthguard, totalling 8 l.min-1 . Primary outcome was hypoxaemia, defined as Sp O2 < 90% regardless of duration. Hypoxaemia occurred in 7.7% (5/65) of patients with high-flow and 9.1% (6/66) with low-flow nasal oxygen (percentage point difference -1.4%, 95%CI -10.9 to 8.0; p = 0.77). Between the groups, there were no significant differences in frequency of hypoxaemic episodes; lowest Sp O2 ; peak transcutaneous carbon dioxide; hypercarbia (transcutaneous carbon dioxide > 2.66 kPa from baseline); requirement of chin lift/jaw thrust; nasopharyngeal airway insertion; bag-mask ventilation; or tracheal intubation. Following adjustment for duration of the procedure, the primary outcome remained non-significant. In high-risk patients undergoing endoscopic retrograde cholangiopancreatography, oxygen therapy with high-flow nasal oxygen did not reduce the rate of hypoxaemia, hypercarbia or the need for airway interventions, compared with combined oral and nasal low-flow oxygen.


Assuntos
Hipóxia/terapia , Oxigenoterapia/métodos , Administração Intranasal , Idoso , Idoso de 80 Anos ou mais , Anestesia Geral , Dióxido de Carbono/sangue , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Oxigênio/administração & dosagem , Oxigênio/sangue , Resultado do Tratamento
4.
Chaos ; 30(12): 123133, 2020 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-33380039

RESUMO

By developing quasi-discrete multiple-scale method combined with tight-binding approximation, a novel quadratic Riccati differential equation is first derived for the soliton dynamics of the condensed bosons trapped in the optical lattices. For a lack of exact solutions, the trial solutions of the Riccati equation have been analytically explored for the condensed bosons with various scattering length as. When the lattice depth is rather shallow, the results of sub-fundamental gap solitons are in qualitative agreement with the experimental observation. For the deeper lattice potentials, we predict that in the case of as>0, some novel intrinsically localized modes of symmetrical envelope, topological (kink) envelope, and anti-kink envelope solitons can be observed within the bandgap in the system, of which the amplitude increases with the increasing lattice spacing and (or) depth. In the case of as<0, the bandgap brings out intrinsically localized gray or black soliton. This well provides experimental protocols to realize transformation between the gray and black solitons by reducing light intensity of the laser beams forming optical lattice.

5.
Sci Adv ; 6(37)2020 09.
Artigo em Inglês | MEDLINE | ID: mdl-32917695

RESUMO

Embryonic diapause is a maternally controlled phenomenon. The molecule controlling the onset of the phenomenon is unknown. We demonstrated that overexpression of microRNA let-7a or incubation with let-7g-enriched extracellular vesicles from endometrial epithelial cells prolonged the in vitro survival of mouse blastocysts, which developed into live pups after having been transferred to foster mothers. Similar to in vivo dormant blastocysts, let-7-induced dormant blastocysts exhibited low level of proliferation, apoptosis, and nutrient metabolism. Let-7 suppressed c-myc/mTORC1 and mTORC2 signaling to induce embryonic diapause. It also inhibited ODC1 expression reducing biosynthesis of polyamines, which are known to reactivate dormant embryos. Furthermore, the overexpression of let-7 blocked trophoblast differentiation and implantation potential of human embryo surrogates, and prolonged survival of human blastocysts in vitro, supporting the idea that embryonic diapause was an evolutionary conserved phenomenon. In conclusion, let-7 is the main factor inducing embryonic diapause.


Assuntos
Diapausa , Vesículas Extracelulares , MicroRNAs , Animais , Blastocisto/fisiologia , Implantação do Embrião/genética , Desenvolvimento Embrionário/genética , Endométrio/metabolismo , Vesículas Extracelulares/metabolismo , Feminino , Camundongos , MicroRNAs/genética , MicroRNAs/metabolismo
6.
Phys Rev E ; 99(6-1): 062222, 2019 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-31330672

RESUMO

A distributed electrical transmission network with dispersive elements that consists of a large number of identical unit cells is considered. Using the reductive perturbation method in the semidiscrete limit, we show that the voltage for the network is described by a nonlinear Schrödinger (NLS) equation with an external linear potential. Using such a NLS equation, the propagation of the first- and second-order rogue waves in the system is predicted and analyzed quantitatively and qualitatively. The rogue waves are expected to propagate for the bandwidth frequencies where the network may exhibit modulational instability. The effects of relevant network parameters on the characteristics of the rogue wave parameters are investigated. We show how to manipulate the relevant network parameters as well as the propagating frequency either to amplify the propagation of the rogue waves through the network, or to prevent rogue waves from being amplified in the network under consideration.

7.
Phys Rev Lett ; 122(22): 223202, 2019 Jun 07.
Artigo em Inglês | MEDLINE | ID: mdl-31283295

RESUMO

We investigate the photovoltaic effect of atomtronics induced by an artificial gauge field in four optical potentials. Under an effective magnetic flux, the atom occupation probability would be polarized in a double-dot system, which gives rise to an atomic current. The relation between the atomic current and magnetic flux behaves like the current-phase property in a Josephson junction. A neutral particle photovoltaic cell is well defined by the atomic opened system that has an effective voltage and two different poles corresponding to two internal states of atomtronics. The atom flow is controllable by tuning the direction of incident light and other parameters. The detection of the atomic current intensity is available through an optical emission spectrum in experiments.

8.
Anaesthesia ; 74(5): 585-593, 2019 May.
Artigo em Inglês | MEDLINE | ID: mdl-30740657

RESUMO

Regional anaesthesia is often helpful in improving respiratory function and analgesia following multiple rib fractures. The erector spinae plane block has become the technique of choice in our institution due to its relative simplicity and purported safety. The aim of this retrospective cohort study was to determine its effectiveness in improving respiratory and analgesic outcomes. We reviewed electronic medical records of patients with traumatic rib fractures admitted to a level-one trauma centre between January 2016 and July 2017, who also received erector spinae plane blocks. We analysed the following outcomes before and up to 72 h after erector spinae plane blockade: incentive spirometry volume; maximum numerical rating scale static pain scores; and 12-h opioid consumption. Pre- and post-block data were compared. We included 79 patients, 77% of whom received continuous erector spinae plane block for a mean (SD) of 3.7 (1.9) days. The majority (85%) had other associated injuries. Incentive spirometry volumes improved from 784 (694) to 1375 (667) ml (p < 0.01) during the first 24 h following erector spinae plane blockade. Pain scores were reduced from 7.7 (2.5) to 4.7 (3.2) in the first three hours (p < 0.01). Reductions in opioid consumption were observed but did not achieve statistical significance. These improvements were largely sustained for up to 72 h. Mean arterial blood pressure remained unchanged from baseline. In conclusion, erector spinae plane blocks were associated with improved inspiratory capacity and analgesic outcomes following rib fracture, without haemodynamic instability. We propose that it should be considered to be a viable alternative to other regional analgesic techniques when these are not feasible.


Assuntos
Inalação/efeitos dos fármacos , Bloqueio Nervoso/métodos , Dor/etiologia , Dor/prevenção & controle , Fraturas das Costelas/complicações , Idoso , Analgésicos Opioides/administração & dosagem , Anestésicos Locais/administração & dosagem , Anestésicos Locais/farmacologia , Pressão Sanguínea/efeitos dos fármacos , Esquema de Medicação , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Manejo da Dor/métodos , Medição da Dor/métodos , Músculos Paraespinais , Estudos Retrospectivos , Ropivacaina/administração & dosagem , Ropivacaina/farmacologia , Espirometria/métodos
9.
Insect Mol Biol ; 28(3): 301-312, 2019 06.
Artigo em Inglês | MEDLINE | ID: mdl-30471154

RESUMO

Cells produce an extracellular matrix (ECM) with a stereotypic organization that is important for tissue function. The insect cuticle is a layered ECM that mainly consists of the polysaccharide chitin and associated proteins adopting a quasi-crystalline structure. Our understanding of the molecular mechanisms deployed during construction of the highly ordered protein-chitin ECM so far is limited. In this study, we report on the role of the chitin deacetylase 1 (LmCDA1) in the organization of the protein-chitin ECM in the migratory locust Locusta migratoria, and LmCDA1 localizes predominantly to the apical tier of the protein-chitin ECM, but it is also found in lower regions. Reduction of LmCDA1 function correlates with lower amounts of chitin and impedes conversion of chitin to chitosan by deacetylation. Establishment of the quasi-crystalline architecture of the protein-chitin ECM is, however, independent of LmCDA1 activity, but it is dependent on another chitin deacetylase, LmCDA2, which has no detectable effects on chitin deacetylation and, as shown previously, no influence on chitin content. Our data reveal that LmCDA1 and LmCDA2 act in parallel and independently from each other in defining the dimensions of the cuticle. Both enzymes are non-uniformly distributed within the protein-chitin matrix, suggesting a site-autonomous function.


Assuntos
Amidoidrolases/genética , Quitina/metabolismo , Proteínas de Insetos/genética , Locusta migratoria/genética , Acetilação , Amidoidrolases/química , Amidoidrolases/metabolismo , Sequência de Aminoácidos , Exoesqueleto/metabolismo , Animais , Proteínas de Insetos/química , Proteínas de Insetos/metabolismo , Locusta migratoria/crescimento & desenvolvimento , Locusta migratoria/metabolismo , Ninfa/crescimento & desenvolvimento , Ninfa/metabolismo , Filogenia , Alinhamento de Sequência
10.
Phys Rev E ; 98(1-1): 012204, 2018 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-30110784

RESUMO

In this paper, we consider a Gross-Pitaevskii (GP) equation with a time-dependent nonlinearity and a spatiotemporal complex linear term which describes the dynamics of matter-wave solitons in Bose-Einstein condensates (BECs) with time-dependent interatomic interactions in a parabolic potential in the presence of feeding or loss of atoms. We establish the integrability conditions under which analytical solutions describing the modulational instability and the propagation of both bright and dark solitary waves on a continuous wave background are obtained. The obtained integrability conditions also appear as the conditions under which the solitary waves of the BECs can be managed by controlling the functional gain or loss parameter. For specific BECs, the dynamics of bright and dark solitons are investigated analytically through the found exact solutions of the GP equation. Our results show that under the integrability conditions, the gain or loss parameter of the GP equation can be used to manage the motion of both bright and dark solitons. We show that for BECs with loss (gain) of atoms, the bright and dark solitons during their propagation have a compression (broadening) in their width. Furthermore, under a safe range of parameters and under the integrability conditions, it is possible to squeeze a bright soliton of BECs with loss of atoms into the assumed peak matter density, which can provide an experimental tool for investigating the range of validity of the 1D GP equation. Our results also reveal that under the conditions of the solitary wave management, neither the injection or the ejection of atoms from the condensate affects the soliton peak during its propagation.

11.
Phys Rev E ; 97(5-1): 052205, 2018 May.
Artigo em Inglês | MEDLINE | ID: mdl-29906882

RESUMO

A modified lossless nonlinear Noguchi transmission network with second-neighbor interactions is considered. In the semidiscrete limit, we apply the reductive perturbation method and show that the dynamics of modulated waves propagating through the network are governed by an NLS equation with linear external potential. Classes of exact solitonic solutions of this network equation are derived, proving possible transmission of both bright and dark solitonlike pulses through the network. The effects of both the coupling second-neighbor parameter L_{3} and the strength λ of the linear potential on the dynamics of modulated waves through the network are investigated. One of the main results of our work is that with the introduction of the second neighbors in the network, two solitary signals, either two bright solitary signals or one bright and one dark solitary signal, may simultaneously propagate at the same frequency through the network.

12.
Sci Rep ; 8(1): 7884, 2018 May 15.
Artigo em Inglês | MEDLINE | ID: mdl-29760519

RESUMO

A correction to this article has been published and is linked from the HTML and PDF versions of this paper. The error has not been fixed in the paper.

13.
Sci Rep ; 8(1): 3049, 2018 02 14.
Artigo em Inglês | MEDLINE | ID: mdl-29445201

RESUMO

Understanding the nature of the magnetic-field-induced precipitation behaviors represents a major step forward towards unravelling the real nature of interesting phenomena in Fe-based alloys and especially towards solving the key materials problem for the development of fusion energy. Experimental results indicate that the applied high magnetic field effectively promotes the precipitation of M23C6 carbides. We build an integrated method, which breaks through the limitations of zero temperature and zero external field, to concentrate on the dependence of the stability induced by the magnetic effect, excluding the thermal effect. We investigate the intimate relationship between the external field and the origins of various magnetics structural characteristics, which are derived from the interactions among the various Wyckoff sites of iron atoms, antiparallel spin of chromium and Fe-C bond distances. The high-magnetic-field-induced exchange coupling increases with the strength of the external field, which then causes an increase in the parallel magnetic moment. The stability of the alloy carbide M23C6 is more dependent on external field effects than thermal effects, whereas that of M2C, M3C and M7C3 is mainly determined by thermal effects.

14.
Anaesth Intensive Care ; 46(1): 51-57, 2018 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-29361256

RESUMO

The 'torsadogenic' property of a drug is linked to its ability to increase the transmural dispersion of repolarisation, represented by the interval between the peak of, and the end of, the T-wave (Tp-e interval) in an electrocardiogram. Reports have consistently shown that sevoflurane does not increase the Tp-e interval. Type 2 diabetes is a risk factor for increased QTc (rate-corrected QT interval), QTcd (rate-corrected QTc dispersion: difference between the maximum and the minimum QTc interval), and Tp-e, as well as the rate-corrected Tp-e (Tp-e/QTc ratio). The study aimed to ascertain whether sevoflurane increased the Tp-e interval and Tp-e/QTc ratio in patients with diabetes, thereby increasing their risk of torsades. We enrolled 35 female patients; 17 with type 2 diabetes and 18 controls undergoing non-laparoscopic surgery under sevoflurane anaesthesia. The Tp-e interval, Tp-e/QTc ratio, QTc and QTcd were recorded after intubation, 5, 10, 30 and 60 minutes into the anaesthetic, and were compared between the groups. No significant increase in the Tp-e interval or Tp-e/QTc was observed between or within the groups (a 13 ms increase was considered significant). In the control group, the QTc was significantly increased from baseline immediately after intubation (449 versus 414 ms, P <0.001); at 5 minutes (434 versus 414 ms, P=0.01); at 10 minutes (444 versus 414 ms, P=0.002); at 30 minutes (439 versus 414 ms, P=0.001) and at 60 minutes (442 versus 414 ms; P <0.001) (a 20 ms increase was considered significant). No significant increase in QTc was observed in the diabetic group. There were no between or within group differences observed for QTcd. Our findings suggest that sevoflurane does not have a significant predictable pro-arrhythmic effect in type 2 diabetic patients in the absence of other factors affecting ventricular repolarisation.


Assuntos
Anestésicos Inalatórios/farmacologia , Arritmias Cardíacas/induzido quimicamente , Diabetes Mellitus Tipo 2/complicações , Eletrocardiografia/efeitos dos fármacos , Frequência Cardíaca/efeitos dos fármacos , Éteres Metílicos/farmacologia , Feminino , Humanos , Pessoa de Meia-Idade , Estudos Prospectivos , Sevoflurano
15.
Clin Radiol ; 73(3): 231-236, 2018 03.
Artigo em Inglês | MEDLINE | ID: mdl-29167015

RESUMO

AIM: To quantitatively assess fat infiltration in the sacroiliac joints (SIJs) of patients with ankylosing spondylitis (AS) by measuring the fat/water signal ratios of periarticular bone marrow with iterative decomposition of water and fat with echo asymmetry and least square estimation (IDEAL). MATERIALS AND METHODS: Routine SIJ magnetic resonance imaging (MRI) and IDEAL were performed on 40 patients with AS and 30 healthy subjects. The fat infiltration regions (FIRs) and normal-appearing regions (NARs) of patients were measured based on the fat/water signal intensity on IDEAL. RESULTS: AS patients had higher fat/water signal ratios on FIRs and NARs (65.4-85.4%, p<0.05, and 44.1-70.7%, p<0.05, respectively) compared to healthy controls (38.3-43.3%). After treatment, the fat/water signal ratios of FIRs and NARs decreased (42.1-53.7% and 41.5-50.3%, respectively), but they remained higher than in the healthy controls (p<0.05). The fat infiltration was detected more effectively with a fat fraction map of the IDEAL sequence (95%) than other sequences, including the T1-weighted sequence (65%), and the fat/water signal ratios of the sacrum and ilium between the left and right sides of SIJs were approximately the same. CONCLUSION: The findings of this study suggest that IDEAL may be useful as a quantitative and objective method for evaluating the fat infiltration in the periarticular bone marrow of SIJs with AS; additionally, the sensitivity of IDEAL is better than that of routine sequences in detecting micro-fat infiltration of SIJs, and IDEAL can be used to quantitatively measure the adipose content and monitor patient follow-up after AS treatment.


Assuntos
Tecido Adiposo/patologia , Aumento da Imagem/métodos , Imageamento por Ressonância Magnética/métodos , Articulação Sacroilíaca/diagnóstico por imagem , Espondilite Anquilosante/diagnóstico por imagem , Adolescente , Adulto , Biomarcadores/sangue , Estudos de Casos e Controles , Feminino , Humanos , Análise dos Mínimos Quadrados , Masculino , Pessoa de Meia-Idade , Articulação Sacroilíaca/patologia , Espondilite Anquilosante/patologia
16.
Zhonghua Yi Xue Za Zhi ; 97(45): 3558-3561, 2017 Dec 05.
Artigo em Chinês | MEDLINE | ID: mdl-29275595

RESUMO

Objective: To explore the clinical efficacy of rivaroxaban in the prevention and treatment of postoperative deep vein thrombosis (DVT) for severe traumatic brain injury (sTBI). Methods: Patients with sTBI who met the inclusion criteria were enrolled in this study, including 119 males (75.8%) and 38 females (24.2%), aged (38.75 ± 11.98) years old. DVT was prevented and treated according to the DVT screening and anticoagulation regimen. Intermittent venous compression was used on all of the patients to prevent DVT, and D-dimer dynamic monitoring and regular ultrasound were performed to screen for DVT. For patients with stable intracranial hemorrhage, rivaroxaban was used when the D-dimer was declining continuously and high risks exist at the same time, or the DVT was diagnosed. Drug withdrawal was performed according to the regimen. The clinical information, D-dimer dynamic changes, rivaroxaban application, DVT, and bleeding complications were analyzed retrospectively. Results: None of the patients with continuously declining D-dimer was diagnosed with DVT according to the ultrasound examination. Of the 45 patients without progressively declining D-dimer, 43 cases were diagnosed with DVT. Rivaroxaban was used in 47 cases (29.9%) to prevent DVT and 43 cases (27.4%) to treat DVT, and the medication time was (16.3±6.5) and (49.3 ± 9.9) days, respectively. None was diagnosed with DVT after prophylactic administration, and 1 case relapsed after therapeutic administration. During the 6-months follow-up after injury, hematuria occurred in 3 cases, tracheotomy errhysis in 1 case and hemorrhoids bleeding in 1 case. Symptomatic pulmonary embolism, intracranial hemorrhage and fatal bleeding did not occur in any of the cases. Conclusions: The application of rivaroxaban is safe and effective in preventing and treating the postoperative DVT.


Assuntos
Lesões Encefálicas Traumáticas , Inibidores do Fator Xa/uso terapêutico , Complicações Pós-Operatórias/tratamento farmacológico , Rivaroxabana/uso terapêutico , Trombose Venosa/tratamento farmacológico , Adulto , Anticoagulantes , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Complicações Pós-Operatórias/prevenção & controle , Embolia Pulmonar , Resultado do Tratamento , Trombose Venosa/prevenção & controle
17.
Phys Rev E ; 96(2-1): 022221, 2017 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-28950556

RESUMO

A lossless nonlinear LC transmission network is considered. With the use of the reductive perturbation method in the semidiscrete limit, we show that the dynamics of matter-wave solitons in the network can be modeled by a one-dimensional Gross-Pitaevskii (GP) equation with a time-dependent linear potential in the presence of a chemical potential. An explicit expression for the growth rate of a purely growing modulational instability (MI) is presented and analyzed. We find that the potential parameter of the GP equation of the system does not affect the different regions of the MI. Neglecting the chemical potential in the GP equation, we derive exact analytical solutions which describe the propagation of both bright and dark solitary waves on continuous-wave (cw) backgrounds. Using the found exact analytical solutions of the GP equation, we investigate numerically the transmission of both bright and dark solitary voltage signals in the network. Our numerical studies show that the amplitude of a bright solitary voltage signal and the depth of a dark solitary voltage signal as well as their width, their motion, and their behavior depend on (i) the propagation frequencies, (ii) the potential parameter, and (iii) the amplitude of the cw background. The GP equation derived in this paper with a time-dependent linear potential opens up different ideas that may be of considerable theoretical interest for the management of matter-wave solitons in nonlinear LC transmission networks.

18.
Zhonghua Yi Xue Za Zhi ; 97(31): 2435-2438, 2017 Aug 15.
Artigo em Chinês | MEDLINE | ID: mdl-28835044

RESUMO

Objective: To explore the clinical efficacy of prevention strategy for acute intraoperative encephalocele of patients with severe traumatic brain injury (sTBI). Methods: A total of 173 patients with sTBI, who treated in Emergency Neurosurgery Department of Shandong University Qilu Hospital from January, 2011 to September, 2015 were collected and divided into research group and control group, according to their therapeutic strategy.The clinical data during hospitalization and prognosis 1 year after injury was analyzed retrospectively to clarify the effect of acute encephalocele prevention strategy. Results: There were no statistically significant differences in sex, age, preoperative Glasgow coma scale score and imaging type of lesion between patients from the two groups.The highest intraoperative intracranial pressure in the research group and control group were (35.71±4.13) mmHg and(34.85±3.81) mmHg, respectively.The acute encephalocele incidence of the research group (7 cases, 6.5%) was significantly lower than that of the control group (13 cases, 19.7%) (P<0.01). Subgroup analysis showed that the incidence of acute encephalocele in patients with only unilateral lesions was low (1.3%), while higher (19.4%) in patients with both unilateral lesions and other secondary lesions or diffuse brain swelling.The prognosis of the patients was evaluated by Glasgow Outcome Scale according to the follow-up 1 year after injury, and it was suggested that the percentage of patients with good outcome in the research group (62 cases, 57.9%) was remarkably higher than that in the control group (26 cases, 39.4%) (P=0.018). Conclusions: For sTBI patients with high risk of acute encephalocele, prevention strategy was found to be able to retard the progression of delayed hematoma and diffuse brain swelling, prevent the acute encephalocele during operation, and then significantly improve the prognosis.


Assuntos
Lesões Encefálicas Traumáticas , Encefalocele , Escala de Coma de Glasgow , Humanos , Estudos Retrospectivos , Resultado do Tratamento
19.
Phys Chem Chem Phys ; 19(12): 8161-8173, 2017 Mar 22.
Artigo em Inglês | MEDLINE | ID: mdl-28079215

RESUMO

A self-assembled MoS2/Mo-S-C multilayer film prepared by r.f. co-sputtering of MoS2 and graphite targets was tribotested in diverse sliding atmospheres, and the lubricant mechanism and its correlations to the selective releasing behavior of non-lubricant component were analyzed in detail. Based on the analysis of composition and structural transformation of transferred materials by Raman and HRTEM characterizations, selective releasing behavior according to the sliding atmospheres were found to be particularly apparent in vacuum and dry inert atmospheres. Under these conditions, a-C in graphitic form was selectively released outwards from the topmost surfaces of contacts, leaving MoS2 layers finely reordered in (002) orientation playing a lubricant role. Composition and structural transformation were observed not only on the topmost surface of wear track but also on the underlying layer at a thickness of tens of nanometers. Moreover, it was found that the selective releasing of a-C initiated from the center of contacts with higher pressure, and then developed toward the edges, resulting in a gradual change in the composition and microstructure of the transferred materials from the well-aligned MoS2 layers in the center to the graphitic a-C dominant composites at the edges. The short running-in periods and low-friction performance in all the tribotests suggested that the initial preference of MoS2-riched sublayers in (002) orientation may facilitate the formation of shearless tribofilms and therefore provide a feasible way of structural tailoring in the MoS2-based lubricant films for an improved triboactive response.

20.
Sci Rep ; 6: 37679, 2016 11 24.
Artigo em Inglês | MEDLINE | ID: mdl-27883037

RESUMO

We study the ground-state behavior of a Bose-Einstein Condensate (BEC) in a Raman-laser-assisted one-dimensional (1D) optical lattice potential forming a multilayer system. We find that, such system can be described by an effective model with spin-orbit coupling (SOC) of pseudospin (N-1)/2, where N is the number of layers. Due to the intricate interplay between atomic interactions, SOC and laser-assisted tunnelings, the ground-state phase diagrams generally consist of three phases-a stripe, a plane wave and a normal phase with zero-momentum, touching at a quantum tricritical point. More important, even though the single-particle states only minimize at zero-momentum for odd N, the many-body ground states may still develop finite momenta. The underlying mechanisms are elucidated. Our results provide an alternative way to realize an effective spin-orbit coupling of Bose gas with the Raman-laser-assisted optical lattice, and would also be beneficial to the studies on SOC effects in spinor Bose systems with large spin.

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