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Larger-sized primary carbides lead to stress concentration during the application of H13 hot-work die steel, resulting in microcracks and fatigue failure. Rare earth was usually added to modify the carbides and inclusions. The existing literature is reviewed on the effect of rare earth on primary carbides in H13 steel. A comprehensive review on the effect of rare earth on the characteristics of primary carbides, i.e., number, size, morphology, and thermal stability in H13 steel, was done. The precipitation mechanism and nucleation of primary carbides with rare earth were summarized. The position and form of rare earth in steel and their effects on alloying elements segregation were reviewed. The addition techniques of rare earth in H13 steel were compared, and the prospects for other uncommon rare earth and emerging technology were present. Based on the current references, it can be known that adding rare earth facilitated refined and dispersed primary carbides. The size of primary carbides would be reduced, and their morphology would be improved because the rare earth inclusions formed in H13 steel can act as nucleation cores for γ-Fe or δ-Fe, refining the dendritic structure. Besides, the number of primary carbides at grain boundaries would be significantly reduced. However, rare earth had little impact on thermal stability. The nucleation of primary carbides tended to be inhibited due to the modification of inclusions by rare earth which were likely to be nucleation cores for primary carbides. Rare earth had been reported to affect the mechanism and process of primary carbide precipitation. Additionally, the addition of rare earth can inhibit the segregation of alloying elements and carbon diffusion by calculation. Thus, laboratory experiments and theoretical calculations need to be conducted to study the states and evolution of rare earth steels.

As a pivotal subject within the realm of agriculture, the transformation of agricultural enterprises has been progressively capturing extensive attention from scholars and decision-makers alike. In order to understand the research hotspots and trends in the field of agricultural enterprise transformation, a comprehensive analysis was conducted employing Citespace software, utilizing the Web of Science Core Collection as the primary data source. This multidimensional investigation encompassed diverse aspects such as publishing countries, research institutions, publishing journals, subject categories, most cited journals, most cited papers, keyword co-occurrence, keyword clustering, and keyword burst. The synthesis of these analyses yielded a comprehensive overview of research hotspots and developmental trends in the field of agricultural enterprise transformation and development. The findings indicate an ascending trend in the annual paper publications within the agricultural enterprise transformation and development field. The countries contributing most significantly to publications include the People’s Republic of China, the United States, Italy, Spain, and Australia. Notably, the journal “Sustainability” featured the highest publications. Keywords with substantial frequency of occurrence encompass “Innovation”, “Performance”, “Impact”, “Management” and “Sustainability”. The identified research hotspots could be synthesized into two main thematic categories: “Sustainable Development and Innovation” and “Agricultural Innovation Development and Policy”. Foreseeably, the forthcoming trajectory of research within agricultural enterprise transformation and development is likely to focus on sustainable development and innovation management of agricultural enterprises.

Human mobility prediction is important for many applications. However, training an accurate mobility prediction model requires a large scale of human trajectories, where privacy issues become an important problem. The rising federated learning provides us with a promising solution to this problem, which enables mobile devices to collaboratively learn a shared prediction model while keeping all the training data on the device, decoupling the ability to do machine learning from the need to store the data in the cloud. However, existing federated learning-based methods either do not provide privacy guarantees or have vulnerability in terms of privacy leakage. In this paper, we combine the techniques of data perturbation and model perturbation mechanisms and propose a privacy-preserving mobility prediction algorithm, where we add noise to the transmitted model and the raw data collaboratively to protect user privacy and keep the mobility prediction performance. Extensive experimental results show that our proposed method significantly outperforms the existing state-of-the-art mobility prediction method in terms of defensive performance against practical attacks while having comparable mobility prediction performance, demonstrating its effectiveness.

In this article, the multiple-path interference (MPI) and the phase standard deviation of extremely low frequency (ELF: below 30 Hz) waves propagation in an anisotropic Earth-ionosphere waveguide is investigated. The theoretical analysis of the phenomenon of MPI and the phase standard deviation for ELF wave propagation in an anisotropic Earth-ionosphere waveguide are first given. Calculations demonstrate that MPI becomes significantly apparent when the propagation distance exceeds one wavelength. Furthermore, the electric field amplitude calculated in the anisotropic case matches better with the measured data compared to the isotropic case. Due to the influence of the geomagnetic field, noticeable directional differences are observed in the distribution of phase standard deviation. It is also found that the locations of maximum phase standard deviations of the electric field amplitude coincide with the locations of minimum electric field amplitude. Additionally, there is a noticeable aggregation of the interference at certain heights and the intensity at nighttime is greater than that during the daytime.

The mechanoluminescent (ML) stress sensing technology based on a unique mechano-to-photon conversion principle has exhibited great potentials in fields of flexible electronics, structural health diagnosis, biomechanical engineering, and self-powered displays. However, a big challenge for the ML sensing technology is that ML sensing materials with a typical inorganics@organics structure will be damaged when the applied mechanical load exceeds its strength limit, which thus reduces the reliability and durability of the sensing system. Herein, we propose a self-healing method to solve the failure of sensing materials by constructing a polyborosiloxane/ polydimethylsiloxane (PBS/PDMS) dual-network structure. The dynamic borate ester bonding in the PBS network provides self-healing capability, and the chemically crosslinked PDMS network enables the ML materials to maintain good elasticity and structural stability. The mechanical properties and ML properties of the dual-network material can be effectively restored even after fatal fracture, with a 75% recovery rate in tensile strength and nearly 100% recovery of mechano-to-photon conversion efficiency after 10 min at room temperature. The self-healing ML materials allow to greatly promote the applications of ML technologies for complex, high-strength and flexible stress sensing.

Understanding the interactive forces of inclusions on the surface of molten nickel-based superalloys and finding methods to disperse these inclusions help improve performance and service life. The aggregation behavior of aluminum oxide (Al2O3) and calcium aluminate inclusions with different sizes and spacings on the surface of molten nickel-based superalloys was observed in-situ using a high-temperature confocal laser scan microscope. The attractive force acted on Al2O3inclusions with radii of 3.5–6 μm was found ranging from 6.2 × 10–18to 3.6 × 10–15N, and that of CaO·2Al2O3(CA2) inclusions with radii of 3–5.5 μm ranging from 3.5 × 10–19to 8.3 × 10–15N. The capillary force acted on inclusions on the surface of nickel-based superalloy was calculated based on the Kralchevsky–Paunov model and investigated as a function of inclusion size, spacing, and composition. The calculated results were in the same trend as the experimental results. The capillary force acted on inclusions was also affected by their contact angle, the density, surface energy, and oxygen content of the molten alloy. It decreased with increasing alloy density and decreasing contact angle between inclusion with alloy. Thus, the attractive force acted on Al2O3inclusions was smaller on the surface of molten nickel-based superalloy than that of molten steel. Decreasing the oxygen content in the molten nickel-based alloy could increase its surface energy, and the attractive force acted on the inclusions would decrease. When the oxygen content in the molten nickel-based alloy decreased from 0.05 to 0.0001 wt.%, the capillary force acted on the Al2O3inclusions decreased from 1.7 × 10−18to 3.6 × 10−19N, reduced by 79% (1.4 × 10–18N).

The large primary carbides in H13 steel significantly affect its service life. In this study, pre-dispersion technology is used to disperse CeO2nanoparticles, which are then introduced into H13 steel. The effects of CeO2nanoparticles on the inclusions, primary carbides, microstructures, and properties of H13 steel are investigated. Ce-containing inclusions with size of 0.5–2 μm are generated and distributed uniformly in H13 steel owing to the reduction of CeO2by Al and C. Both the dendrite structure and primary carbides in H13 steel are refined by CeO2nanoparticles. The secondary dendrite arm spacing decreases from 13.51 ± 2.34 to 6.90 ± 1.23 μm. The size and number of primary carbides decrease from 1 to 5 to 1–3 μm, and from 1125 to 725/mm2, respectively. This is attributable to the disregistry of Ce-containing inclusions and primary carbides/austenite. The segregation of alloy elements in H13 steel is calculated using the Clyne–Kurz model. The properties of H13 steel are improved via the addition of CeO2; in particular, its tensile strength, total elongation rate, and hardness are 726.38 MPa, 23.43%, and 243.49, respectively, which corresponds to increases by approximately 5.58%, 8.27%, and 10.11%, respectively. The results can facilitate improvements to the performance of H13 steel and the development of rare earth steel.

In today’s information age, high performance nonvolatile memory devices have become extremely important. Despite their potential, existing devices suffer from limitations, such as low operation speed, low memory capacity, short retention time, and a complex preparation process. To overcome these limitations, advanced memory designs are required to improve speed, memory capacity, and retention time and reduce the number of preparation steps. Here, we present a nonvolatile floating-gate-like memory device based on a transistor that uses the polarization effect of ferroelectric material PZT (Pb[Zr0.2Ti0.8]O3) for regulating tunneling electrons for charging and discharging the MoS2channel layer. The transistor is defined as a polarized tunneling transistor (PTT) and does not require a tunnel layer or a floating-gate layer. The PTT demonstrates an ultrafast programming/erasing speed of 25/20 ns and a response time of 120/105 ns, which is comparable to the ultrafast flash memories based on van der Waals heterostructures. Additionally, the PTT has a high extinction ratio of 104, a long retention time of 10 years, and a simple fabrication process. Our research provides future guidelines for the development of the next generation of ultrafast nonvolatile memory devices.

ABSTRACT The purpose of this paper is to present a Brownian motion simulation for the chloride diffusivity of concrete. According to stereological theory, the probability density function and cumulative distribution [...]

In this letter, a frequency- and polarization-reconfigurable bent monopole antenna using liquid metal is proposed. The proposed antenna is designed to operate at continuously tunable frequencies and switch between left-handed circular polarization (LHCP) and right-handed circular polarization (RHCP) states. The frequency reconfigurability is achieved by controlling the length of the liquid metal to change the electrical length of the antenna. The circularly polarization can be achieved by injecting from the inlet, and excited by orthogonal horizontal radiation as well as vertical radiation. 3 dB axial ratio bandwidth of 37.5%(3.12–4.63 GHz) in LHCP state and 48.8% (3.07–5.05 GHz) in RHCP state can be achieved. The whole antenna is characterized by continuous tunability, reconfigurable frequency and polarization, and wide tunable bandwidth. The measured results of constructed prototypes are in close agreement with the simulation results, and its feasibility is fully proved.

Thermal ablation is a main curative therapy for early-stage hepatocellular carcinoma (HCC). However, insufficient ablation has been shown to promote HCC progression. E3 ligases have been approved to play important roles in malignant tumors. Whether E3 ligases are involved in HCC progression caused by insufficient ablation remains unclear. Herein, using RNA-sequencing coupled with an in vitro loss-of-function screen, we found that the E3 ligase Neuronal Precursor cell-expressed Developmentally Downregulated 4 (Nedd4) was upregulated in HCC insufficient ablation tissues and promoted HCC cells migration. The upregulation of Nedd4 was induced by METTL14-mediated N6-methyladenosine modification after sublethal heat treatment. Knockdown of Nedd4 inhibited HCC metastasis and growth in vitro and in vivo. Mechanistically, Nedd4 enhanced TGF-β signal transduction mediated tumor progression by directly binding to TGF-β type I receptor (TGFBR1) and forming K27-linked ubiquitin at Lysine 391. Additionally, the adverse effect on HCC of sublethal heat treatment was mediated by Nedd4. Clinically, high Nedd4 expression was positively correlated with aggressive tumor phenotypes and poor prognosis in HCC patients. Patient-derived xenograft (PDX) model confirmed this conclusion. Collectively, this study demonstrated that Nedd4 induced by insufficient ablation plays a crucial role in promoting HCC progression and provides a novel therapeutic target for HCC.

Aluminum oxide inclusions in SWRS82B steel seriously affect the drawing performance of steel strands. The effects of different addition amounts of yttrium (within the range of 0%–0.026%) on the composition, morphology, size and spacing of aluminum oxide inclusions were studied by scanning electron microscopy and energy spectrum analysis. Based on classical thermodynamics and FactSage software, the predominance diagram of inclusions in Fe–O–S–Y system and the effect of the addition of rare earth yttrium on the stability of alumina inclusions were calculated. The results showed that molten steel was modified by adding the rare earth element yttrium. It can be inferred that the approximate route of target inclusion modification was: Al2O3→ Y2S3+ YAlO3+ Al2O3→ Y2S3+ YAlO3+ Y2O2S + YAlO3+ Al2O3→ Y2S3+ Y2O2S. The experimental samples with 0.026% added yttrium had the best inclusion characteristics, in which the inclusion surface density distribution was uniform, and the interfacial distance between inclusions was mainly in the range of 100–500 μm. After modification, the average inclusion size in molten steel was reduced by 6.9–8.6 μm. The mechanism of yttrium modification was discussed based on actual calculation results and experimental results.

ABSTRACTCircular RNAs (circRNAs) are involved in the development and progression of diabetic cardiomyopathy (DCM). However, the specific function and underlying mechanism of circ_0071269 in DCM remains unclear. In our study, mRNA and miRNA expression was detected by real-time quantitative PCR (qRT-PCR). RNase R and actinomycin D treatment were applied to test the characteristics of circ_0071269. Cell Counting Kit-8 (CCK-8) assay, lactate dehydrogenase (LDH) and enzyme-linked immunosorbent assay (ELISA) kits were performed to determine the cell viability, cell LDH content and interleukin (IL)-1β and IL-18 levels, respectively. Cell death rate was determined by Flow cytometry, and Western blotting was for the protein expression levels. In addition, luciferase reporter and RNA pull-down assays were performed to confirm the binding relationship between miR-145 and circ_0071269 or gasdermin A (GSDMA). Echocardiography, Hematoxylin and Eosin (HE) Staining, and Immunohistochemical (IHC) Staining were performed to evaluate myocardial damage in vivo. We found that circ_0071269 was significantly overexpressed in H9c2 cells upon treatment with high glucose. Knockdown of circ_0071269 promoted cell viability and inhibited the inflammatory response, cytotoxicity, and pyroptosis of H9c2 cells in vitro. Moreover, circ_0071269 sponges miR-145 to upregulate GSDMA. A miR-145 inhibitor antagonized the effects of circ_0071269 knockdown on the cellular functions of H9c2 cells, while the effects of miR-145 were abrogated by the overexpression of GSDMA. Meanwhile, knockdown of circ_0071269 attenuated cardiac dysfunction of DM mice. Hence, circ_0071269 may promote the development of DCM through the miR-145/GSDMA axis and thus provide a novel marker for the treatment of DCM.

The article presents brief profiles of six young people whose employment opportunities were impacted by the COVID-19 pandemic. It mentions the lack of employment prospects in countries including the Philippines, Brazil, and Ghana, the kinds of jobs that the young people are finding, and how they view their future.

Low-grade high-sulfur bauxite was pretreated via suspension roasting and muffle furnace roasting to remove sulfur and enhance digestion properties. The results show that sulfur can be efficiently removed, and the alumina digestion properties are significantly improved after suspension roasting. Under optimal conditions (t=70 min, T=280 °C, w(CaO)=8% and Nk=245 g/L), the digestion ratios are 94.45% and 92.08% for the suspension-roasted and muffle-roasted ore, respectively, and the apparent activation energies are 63.26 and 64.24 kJ/mol, respectively. Two crystal models were established by Materials Studio based on the XRD patterns. The DFT simulation shows that the existing Al—O bands after suspension roasting can improve alumina digestion. The (104) and (113) planes of Al2O3after suspension roasting are found to combine with NaOH more easily than those of Al2O3treated in a muffle furnace.

Heterostructures composed of superconductor and ferroelectrics (SC/FE) are very important for manipulating the superconducting property and applications. However, growth of high-quality superconducting iron chalcogenide films is challenging because of their volatility and FE substrate with rough surface and large lattice mismatch. Here, we report a two-step growth approach to get high-quality FeSe0.5Te0.5(FST) films on FE Pb(Mg1/3Nb2/3)0.7Ti0.3O3with large lattice mismatch, which show superconductivity at only around 10 nm. Through a systematic study of structural and electric transport properties of samples with different thicknesses, a mechanism to grow high-quality FST is discovered. Moreover, electric-field-induced remarkable change of Tc(superconducting transition temperature) is demonstrated in a 20 nm FST film. This work paves the way to grow high-quality films which contain volatile element and have large lattice mismatch with the substrate. It is also helpful for manipulating the superconducting property in SC/FE heterostructures.

Abstract:In recent years the terms "Chinese-language film" or "Sinophone" are often used to refer to a pan-Chinese cinematic culture to reconcile the differences and conflicts in the mainland, Hong Kong, Taiwan, and the Chinese diaspora. Unlike the other three areas that are easily recognized by geo-political borders, Chinese diasporic cinema is of a more conceptual and de-territorialized nature and has been inadequately examined. As early as the mid-1930s, Chinese filmmakers had formed a cross-border, Pacific Rim network for cinematic and cultural exchanges among Chinese diasporic communities. Focusing on Esther Eng 伍錦霞 (1914–1970), a San Francisco-born Chinese female director who produced Cantonese-language films in both the US and Hong Kong from the mid-1930s to the late 1940s, this article revisits a piece of forgotten history of Chinese diasporic cinema. It argues that through Chinese diasporic films, particularly during the height of World War II patriotism, filmmakers like Esther Eng expressed their cultural belonging and fueled cultural intimacy between members of the Chinese diaspora. By observing the flows of talents, ideas, and resources within China and beyond, this article delves into the essence of diasporic film as a "contact zone" for Chinese descendants in and out of the country.Résumé:Ces dernières années, les expressions « cinéma en langue chinoise » ou « Monde chinois » sont souvent utilisées pour désigner une culture cinématographique panchinoise visant à aplanir les différences et les conflits en Chine continentale, à Hong Kong, Taiwan, ainsi que dans la diaspora chinoise. Contrairement aux trois premières régions ci-dessus, facilement reconnues grâce à leurs frontières géopolitiques, le cinéma de la diaspora chinoise est plutôt de nature conceptuelle et déterritorialisée, et a donc fait l'objet de très peu d'études sur les plans théorique et historique. Dès le milieu des années 1930, les cinéastes chinois constituèrent un réseau transfrontalier de la ceinture du Pacifique destiné à promouvoir des échanges cinématographiques et culturels entre les communautés de la diaspora chinoise. Se concentrant sur Esther Eng (1914–1970), une cinéaste d'origine chinoise née à San Francisco qui a réalisé des films en cantonais à la fois aux États-Unis et à Hong Kong à partir du milieu des années 1930 jusqu'à la fin des années 40, le présent article se propose de réexaminer un aspect de l'histoire oubliée du cinéma de la diaspora chinoise. Notre travail soutient que, par l'entremise des films de la diaspora chinoise, en particulier des films produits à l'apogée du patriotisme de la Deuxième Guerre mondiale, des cinéastes tels qu'Esther Eng ont exprimé leur appartenance culturelle et alimenté une intimité culturelle entre les membres de la diaspora chinoise. En observant la circulation de talents, d'idées et de ressources en Chine et au-delà du pays, cet article étudie l'essence du cinéma diasporique en tant que « zone de contact » pour les descendants chinois aussi bien à l'intérieur qu'à l'extérieur du pays.

As a central hub in cognitive and emotional brain circuits, the striatum is considered likely to be integrally involved in the psychopathology of bipolar disorder (BD). However, it remains unclear how alterations in striatal function contribute to distinct symptomatology of BD during different mood states.

Background Chemotherapy is the standard treatment for non-small cell lung cancer (NSCLC). However, chemoresistance frequently occurs, making the treatment of NSCLC more difficult.Method We combined clinical and experimental studies to establish the role of microRNA (miR)-34c in NSCLC metastasis and chemoresistance.Results MiR-34c expression was significantly decreased in patients with NSCLC who showed a poor chemoresponse and metastasis. Overexpression of miR-34c sensitized NSCLC cells to paclitaxel and cisplatin both in vitroand in vivo. Furthermore, we found that NOTCH1 was target of miR-34c in NSCLC cells and played a key role in the effects of miR-34c on NSCLC.Conclusion NSCLC metastasis and chemoresistance are suppressed though the miR-34c/NOTCH1 axis. MiR-34c has important implications in the development of therapeutic strategies for metastasis and chemoresistance in NSCLC.

Supplemental Digital Content is available in the text.

Electrochemical impedance spectroscopy (EIS) is a technology of nondestructive electrochemical testing. In this paper, EIS is applied to study the corrosion processes of Al-Mg coatings. In the initial 24 h of immersion in 3.5% NaCl solution, passive films of Al-Mg coatings dissolve quickly. As time passed, corrosion products increase on surface gradually, which can inhibit corrosion. After 480h of immersion, corrosion products fully cover on Al-Mg coatings’ surface. The EIS of different corrosion processes are fitted by three equivalent circuits corresponding to the three corrosion processes. In the test of open circuit potentials (OCP), OCP is instable in the initial 24 h of immersion. As immersion time goes by, OCP tends to stabilization at about -0.90 V. Measurements of scanning electron microscope (SEM) confirm the conclusions of electrochemical measurements.

Cyanate ester (CE) resin was modified in a multi-component way using the technology of conjugated tri-component interpenetrating polymer networks (CTC-IPN). Experimental results showed that the three components in the modified composite existed undependably and they interweaved irregularly in the structure of IPN to form a unique supermolecule structure. The analysis by differential scanning calorimetry (DSC) indicated that the Tgof the modified CE was increased by 22°C, compared with the Tgprior to modification. When the amount of an initiator was 0.3% or 0.4% and concurrently the ratio of PST/PMMA/CE was 15/15/85, the flexural strength and the impact strength reached the maximum values. Compared with those of pure CE, the flexural strength was increased by 22.65% and the impact strength by 94.99%, respectively.

An efficient triflic anhydride promoted phosphorylation of ketone was disclosed, and vinylphosphorus compounds were prepared under solvent- and metal-free conditions. Both aryl and alkyl ketones could perform smoothly to give vinyl phosphonates in high to excellent yields. In addition, the reaction was easy to carry out and easy to scale up. Mechanistic studies suggested that this transformation might involve nucleophilic vinylic substitution or a nucleophilic addition–elimination mechanism.

Within the framework of QCD sum rules, we use the least-squares fitting method to investigate the first radial excitations of the nucleon and light mesons such as ρ, K*, π, and φ. The extracted masses of these radial excitations are consistent with the experimental data. In particular, we find that the decay constant of π(1300), which is the first radial excitation of n, is tiny and is strongly suppressed as a consequence of chiral symmetry. [ABSTRACT FROM AUTHOR]

Steel 30CrMnSiNi2A slices were irradiated by a continuous wave fiber laser beam with the intensity of 14.5W/cm2. Alloy samples with various temperature processes were obtained by changing the laser irradiation time, irradiation times and atmosphere environment. X-ray diffraction, scanning electron microscope, energy dispersive spectrometer and nanoindentation system were employed to characterize their microstructure morphology and mechanical properties. Three layers were observed in the samples fracture, namely oxide film, hard brittle layer and alloy substrate. The hard brittle layer had a higher hardness and a lower toughness compared with the base metal. Referring to the temperature history, we deemed that the surface oxidation and the solid phase transformation were the main factors which changed laser coupling efficiency. The results also illuminated the correlation between the microstructure morphology and the response to laser irradiation of the samples.

Estimation of water content is the foundation of natural gas processing and designing, and a formula calculation method provides a solution simple and easy to be programmed by computers. In this regard, several main formula calculation methods of water content in sweet natural gas were reviewed and evaluated individually. There are formulas fitted with nomographic data (e.g. Sloan formula, Ning Yingnan formula, Khaled formula and Bahadori formula), empirical formulas fitted with experimental data (e.g. Zhu Lin formula, Behr formula and Kazim formula) and formulas generated based on water-hydrocarbon phases equilibrium (e.g. Saturated Vapor Pressure Model, Modified Ideal Model, Simplified Thermodynamic Model and Bukacek formula). The comparison of calculated and experimental values of each above formula calculation method indicates that, the Khaled formula provided the minimum average absolute deviation (AAD) – 2.524 0%, while the Behr method achieved the maximum AAD – 19.255%. After the analysis of the AAD results calculated by the methods at different temperature ranges, the Zhu Lin formula is recommended for −50 to −40 °C, the Sloan formula for −40 to 0 °C, the Simplified Thermodynamic Model for 0 to 37.78 °C, the Khaled formula for 37.78 to 171.11 °C, and the Bukacek formula for 171.11 to 237.78 °C.

Motivated by the large cross section of the e+e- → ηJ/ψ process measured by the BESIII and Belle Collaborations recently, we evaluate this process at O(α4s) accuracy in the framework of nonrelativistic QCD. We find that the cross section at the center-of-mass energy √s = 4.009 GeV is 34.6 pb, which is consistent with the BESIII data. The comparison with the Belle data in the region from 4.0 to 5.3 GeV is also presented. Concerning the η and η' mixing and the potential gluonium component of η', we also estimate the rate of the e+e- → ηJ/ψ process, which can be checked within the updated Belle data. [ABSTRACT FROM AUTHOR]

On the foundation of researching adhesion mechanism of superalloy honing stone, theoretical analysis and mathematical modeling of parameters were made that affecting the wear particle adhesion rate of superalloy honing stone, then inspect and verify the relation between the adhesion rate and processing parameters through the experiment. Draw the conclusion that when the honing pressure increases or the speed of work piece decreases, the adhesion rate αa will increase.

Objectives To detect vascular endothelial growth factor (VEGF)-C mRNA expression in surgically resected tissues of ‘pathologic N0’ (pN0) cervical cancer; to investigate the relevance of VEGF-C mRNA expression to clinicopathological factors, lymph node recurrence and prognosis in early stage cervical cancer.Methods Patients with pN0 cervical cancer who successfully underwent radical hysterectomy with bilateral adnexectomy and bilateral pelvic lymphadenectomy were enrolled sequentially into this retrospective study. Reverse transcriptase–polymerase chain reaction (RT–PCR) was performed to detect VEGF-C mRNA.Results Seventy-eight patients entered the study. VEGF-C mRNA was detected in 35 (44.87%) patients and was significantly correlated with tumour differentiation. VEGF-C mRNA expression was significantly associated with lymph node recurrence and poor overall survival 5 years after surgery. Multivariate analysis confirmed that VEGF-C mRNA expression was an independent predictor for lymph node recurrence and unfavourable overall survival.Conclusions These findings indicate that detection of VEGF-C mRNA has clinical potential as a predictor for identifying patients with pN0 cervical cancer at high risk of lymph node recurrence and poor prognosis.

Supported liquid membrane is established by using 2-Ethylhexylphosphoric acid mono-2-ethylhexyl ester as carrier, kerosene as membrane solvent and Polyvinylidene fluoride membrane as matrix. This article analyzes the effects of Cu (II) concentration, migration time, carrier concentration and feed solution pH for the rate of migration by means of monofactor experiments to obtain the optimum experimental conditions. The results indicate that the migration rate of Cu (II) with the optimical conditions as following: Cu (II) concentration at 4×10-4mol/L, migration time at 120min, carrier concentration at 7% and feed solution pH at 5.0, attains to 83.5%, which is the optimum value of Cu (II) migration.

We reinvestigate the possibility of X(3872) as a D¯D* molecule with JPC = 1++ within the framework of both the one-pion-exchange model and the one-boson-exchange model. After careful treatment of the S-D wave mixing, the mass difference between the neutral and charged D¯(D*) mesons and the coupling of the D¯D* pair to D*¯D*, a loosely bound molecular state X(3872) emerges quite naturally with large isospin violation in its flavor wave function. For example, the isovector component is 26.24% if the binding energy is 0.30 MeV, where the isospin breaking effect is amplified by the tiny binding energy. After taking into account the phase space difference and assuming the 3π and 2π come from a virtual omega and rho meson respectively, we obtain the ratio of these two hidden-charm decay modes: B(X(3872) → π+ π- π0J/ѱ)/B(X(3872) → π+ π- J/ѱ = 0.42 for the binding energy being 0.3 MeV, which is consistent with the experimental value. [ABSTRACT FROM AUTHOR]

We have calculated the scattering lengths between the pseudoscalar meson and charmed triplet, sextet, and excited sextet baryon to the third order with the heavy baryon chiral perturbation theory. The chiral expansion of some pion and eta channels converges well. [ABSTRACT FROM AUTHOR]

We investigate the possible molecules composed oftwo heavy flavor baryons such as "AQBQ" (Q = b,c) within the one-pion-exchange model (OPE). Our results indicate that the long-range 7r exchange force is strong enough to form molecules such as [&Sgr;QΞ1Q]I=1/2S=1(Q = b, c), [&Sgr;Q&Lgr;Q]I=1S=1 (Q = b, c), [&Sgr;Ξ1b]I=3/2S=1, and [ΞbΞIb]I=0S=1 where the S-D mixing plays an important role. In contrast, the &pgr; exchange does not form the spin-singlet AQBQ bound states. If we consider the heavier scalar and vector meson exchanges as well as the pion exchange, some loosely bound spin-singlet S-wave states appear while results of the spin-triplet AQBQ system do not change significantly, which implies the pion exchange plays an dominant role in forming the spin-triplet molecules. Moreover, we perform an extensive coupled channel analysis of the &Lgr;Q&Lgr;Q system within the OPE and one-boson-exchange framework and find that there exist loosely bound states of &lgr;Q&Lgr;Q (Q = b, c) with quantum numbers I(JP) = 0(0+), 0(0+), and 0(1-). The binding solutions of &Lgr;Q&Lgr;Q system mainly come from the coupled-channel effect in the flavor space. Besides the OPE force, the medium- and short-range attractive force also plays a significant role in the formation of the loosely bound &Lgr;c&Lgr;c. and &lgr;b&Lgr;b states. Once produced, they will be very stable because such a system decays via weak interaction with a very long lifetime around 10-13-10-12 s. [ABSTRACT FROM AUTHOR]

To remedy polluted soil, EDTA is choosen when seeing metal Pb (Ⅱ) as target pollutant. There has been a focus on discussion about the infuencs of liquid-solid ratio, EDTA concentration and extraction time on Pb (Ⅱ) extraction rate. And attention is being paid to study the effect of Na2S concentration and pH on Pb (Ⅱ) removal rate with Na2S as EDTA regeneration medium. The results obtained demonstrate that when the liquid-solid ratio is 10, EDTA concentration is 0.5 mol/L, extraction time is 24 h, extraction efficiency can reach 66.67 %. When the concentration of Na2S is 0.5 mol/L, pH is 10, the 96.67 % Pb (Ⅱ) removal rate can be achieved.

Existing models appropriate for design applications tend to overestimate the measured effective stiffness and are unacceptably inaccurate, because they generally neglect the influence of anchorage slip on the effective stiffness of the column. A three-component model that explicitly accounts for deformations due to flexure, anchorage-slip, and shear is shown to provide a more accurate estimate of the measured effective stiffness for the database columns. This model is simplified by neglecting small terms and approximating the results of moment-curvature analysis to obtain an accurate and rational effective stiffness model appropriate for design applications. Comparison the measured effective stiffness of reinforced concrete columns from the PEER Structural Performance Database with stiffness calculated following the FEMA 356. The FEMA 356 procedure substantially overestimates the stiffness of columns with low axial loads, in which there can be significant bar slip in the beam-column joints or footings. This model provides practical recommendations for improving estimates of effective stiffness.

Heat transfer coefficient is one of the most important boundary conditions for quenching process simulation. It depends on many factors, such as material, size, surface conditions of a part, and so on. It is, therefore, difficult to evaluate the heat transfer coefficient accurately. T In the environment for large modules P20 and the actual heat transfer conditions, the off-line air-cooling heat transfer coefficient of C are simulated by using empirical equations.

To establish complete stress-strain curve equations for confined concrete in cross-shaped columns, we designed 7 test specimens corresponding to the usable eigenvalue range of stirrup of the cross-shaped columns. We obtained the test results of the reinforced concrete cross-shaped columns through axial compression test, got the system parameters of a stress-strain model through statistical analysis of the test data, and then established stress-strain curves for confined concrete in the cross-shaped columns. This model reflects the variation rule of the stress-strain curve of confined concrete in cross-shaped columns. Compared with the stress-strain model for confined concrete in square columns, the confined concrete in cross-shaped columns has smaller peak stress, larger peak strain, and relatively steeper descending part of curve. The research results provide theorotical basis for nonlinear analysis of cross-shaped columns.

A wall of aerated concrete only can hardly meet the requirements for energy-saving architectural design. If both sides of the wall are provided with thermal insulation mortar to form a composite wall, the heat transfer performance of the wall will be significantly improved. In this Paper, we established an optimization model for the thermal economy of a thermal insulation composite wall according to heat transfer theory and in consideration of the depreciation and maintenance costs of the wall during use, and took the average heat transfer coefficient and index of thermal inertia of the wall as restricted conditions to calculate and analyze the economical thickness of the thermal insulation layer. We expect the optimization model be valuable reference in promoting the application of aerated concrete-based composite thermal insulation walls.

Mixed light aggregates can effectively reduce the coefficient of thermal conductivity of composite materials. Through orthogonal experiments of thermal insulation mortar containing mixed ceramic sand and vitrified micro bead aggregates, we analyzed the law of influence of relevant factors on the dry bulk density, coefficient of thermal conductivity and compressive strength of mortar containing mixed ceramic sand and vitrified micro bead aggregates and provided basic data for further improvement of such thermal insulation mortar so as to promote the development and application of high performance thermal insulation materials.

The particle swarm optimization was applied to the optimum design of the composite box structure.The total weight of the structure was taken as the objective function.A technique of applying PSO integrated with general finite element code was developed for the optimization.Optimization was also conducted using zero-order method included in ANSYS and a comparison was made between zero-order method and PSO.Results demonstrate that PSO can find the global optimal design with higher efficiency regardless of the initial designs.for zero-order method the optimum solution is worst than the result of the PSO optimum.

A theoretical model is developed to account for the effects of strain rate and temperature on the deformation behavior of ultrafine-grained fcc Cu. Three mechanisms, including dislocation slip, grain boundary diffusion, and grain boundary sliding are considered to contribute to the deformation response simultaneously. Numerical simulations show that the strain rate sensitivity increases with decreasing grain size and strain rate, and that the flow stress and tensile ductility increase with either increasing strain rate or decreasing deformation temperature.

Flavonoids belong to a group of plant natural products with variable phenolic structures and play important roles in protection against biotic and abiotic stress. Fenugreek (Trigonella foenumgraecum L.) seeds and stems contain flavonol glycosides and isoflavone derivatives. Up to now, the molecular features of fenugreek flavonoid biosynthesis have not been characterized. Here we present cloning of a cDNA encoding a chalcone isomerase (namely TFGCHI-1) from the leaves of T. foenum-graecum which convert chalcones to flavanones in vitro. Transformation of Arabidopsis loss-of-function tt5 (chi) mutant with a TFGCHI-1 cDNA complemented tt5 and produced higher levels of flavonol glycosides than wild-type Col-0. [ABSTRACT FROM AUTHOR]

800x600 Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman","serif";} To determine the optimal material mixing ratio of and process parameters for aerated concrete products, we adopted various combinations of material mixing ratio and process parameters to test aerated concrete according to the characteristics of local material and process equipment in this study, and obtained the strength and density of the aerated concrete. Using artificial neural network, we built a three-layer neural network model, which was trained based on the data of test samples to obtain a neural network based model system. Sample test showed that the predicted values of the model system fit the test values well; we utilized this system to analyze the material mixing ratio of and process parameters for aerated concrete products, and obtained their optimization results. The strength and density of the aerated concrete manufactured with the optimized parameters reached the desired targets. This method has some reference value for instructing the production of aerated concrete.

Double layer stirrup confined concrete columns use two layers of stirrup, inside and outside, to constrain the core concrete. In this paper, in order to analyze the effect of double layer stirrups on the axial compression characteristics of concrete square columns, to determine the strength and deformation characteristics of double layer stirrup confined concrete square columns, and to establish the bearing capacity calculation equation for double layer stirrup confined concrete square columns, we designed 16 specimens to conduct axial compression test, from which a series of test data were obtained for double layer stirrup confined concrete square columns. We built the bearing capacity calculation equation for double layer stirrup confined concrete components on the basis of analysis and study and compared the calculated values with the test ones, and these data fit well; therefore, the study can provide reference for design and application of double layer stirrup confined concrete square columns.

In order to determine the strength and deformation characteristics of confined concrete under axial compression of cruciform columns, the test results have been obtained for reinforced concrete cruciform columns through axial compression experiment in the study. After analysis and research, the stress-strain curves of confined concrete have been established, the relational expression between the relatively increased value of the peak strain value of confined concrete in cruciform columns and the stirrup characteristic value was proposed, the descending section of the stress-strain curves of confined concrete was studied, and the variation relationship between the strain ductility coefficient of the confined concrete and the stirrup characteristic value was established. The study results will be provided as reference for the structural design and deformation calculation of cruciform columns.