Using cotton and lithium ethoxide as raw materials, carboxymethyl cellulose lithium (CMC‐Li) is synthesized and obtained , and it is used as a water‐based binder in the negative electrode of lithium ...batteries. The synthesis method of a new type of CMC‐Li is mainly studied as a lithium battery negative material binder, and water is used as a dispersant to assemble a battery and the relevant electrochemical performance is tested. CMC‐Li as a lithium‐replenishing binder for lithium batteries has better electrochemical performance. It can reduce the internal resistance of the battery by about 10%, significantly improve the phenomenon of lithium precipitation, the redox peak is reduced by 50% to 0.20 V, and the impedance is also significantly improved, reducing by more than 50%. Under the same conditions, the cycle period can reach 2500 circles, the lifespan is increased by more than 20%, and the effect of lithium supplementation is obvious. It shows that CMC‐Li as a binder can greatly increase the content of lithium ions in the entire lithium battery, and improve the ion conductivity and ion conduction rate, which further verifies the advantages of lithium‐replenishing binders.
Using cotton cellulose polysaccharide as a raw material, a new method is used to synthesize a lithium carboxymethyl cellulose product. This material is used as a lithium‐replenishing binder product in the field of lithium batteries, which can significantly improve the cycle life of lithium batteries and allows lithium replenishment.
Mixed-dimensional perovskite (MDP) heterostructures are promising optoelectronic semiconductors. Yet, the current preparation methods involve complex experimental procedures and material ...compatibility constraints, limiting their widespread applications. Here, we present a one-step room temperature solution-based approach to synthesize a range of 1D C4N2H14PbBr4 and 3D APbBr3 (A = Cs+, MA+, FA+) self-assembled MDP heterostructures exhibiting high-efficiency white light-emitting properties. The ultra-broadband emission results from the synergy between the self-captured blue broadband emission from 1D perovskites and the green emission of 3D perovskites, covering the entire visible-light spectrum with a full width at half-maximum exceeding 170 nm and a remarkable photoluminescence quantum yield of 26%. This work establishes a novel prototype for the preparation of highly luminescent MDP heterostructures, offering insights for future research and industrialization in the realm of white light LEDs.
The topological skyrmions in ferrimagnet systems provide new opportunities to investigate the fundamental spin dynamics. Effective manipulation of ferrimagnet skyrmion motion is a vital task for ...future spintronics applications, motivating intense research on magnetization dynamics with voltage as driving sources. In this work, the skyrmion in ferrimagnets driven by voltage controlled magnetic anisotropy gradients, which tends to move toward the low anisotropy area and has a constant velocity, is investigated. Thiele's theory analysis is reported on the velocities of the skyrmion dependencies on the anisotropy gradient, the net angular momentum density, and the damping coefficient, which are confirmed nicely by the atomistic simulations. It is demonstrated that the velocity of the skyrmion reaches to a maximum value at a nonzero net angular momentum density δs different from the domain wall, and the Hall angle of ferrimagnet skyrmions can be controlled by δs. The results are useful for the understanding of ferrimagnet skyrmion dynamics and may open an alternative way for the design of ferrimagnet spintronic devices.
In ferrimagnets, the maximal velocity of skyrmions does not appear at angular momentum compensation temperature, which is different from the ferrimagnet domain wall. In addition, the skyrmion motion velocity and direction can be modulated by adjusting the net angular momentum density. The obtained results are useful for future experiment design and spintronic applications in ferrimagnets.
The susceptibility of composite materials to internal damage caused by low-velocity impact is well known and creates a major concern related to structural health monitoring. This research presents a ...near-field impact monitoring method based on the two-dimensional multiple signal classification method for the composite structure. Since elastic waves attenuate quickly in the complex aircraft composite structures and impacts may happen near the sensors, near-field impact monitoring method is important. However, most of the methods reported are based on the far-field assumption. When impacts occur not far enough from the sensors, this belongs to the near-field situation, where the elastic wave fronts are spherical and the direction estimation method with the plane wave hypothesis is no longer valid. Hence, this article focuses the research of a near-field multiple signal classification–based impact localization method. To verify the proposed method, two experiments are performed on composite structures. The localization results are in good agreement with the actual impact occurring positions in near-field area. Finally, the proposed method is applied to a real aircraft composite oil tank showing its successful performance on complex composite structure.
Ruthenium(II) complexes, Ru(bpy)
2LX
2 (L
=
L1(5,5′-dibromo-2,2′-bipyridine),
L2(5-bromo-5′-carbazolyl-2,2′-bipyridine),
L3(5,5′-dicarbazolyl-2,2′-bipyridine); X
=
Cl
−, PF
6
−), were synthesized ...based on 2,2′-bipyridine and its derivatives. The complexes with carbazole moieties show better photoluminescence and electrochemiluminescence properties than that without carbazole. And, the complexes with PF
6 anions exhibit higher electroluminescence in Ru(bpy)
2L
2+/tri-
n-propylamine (TPrA) acetonitrile solution than that with Cl
− based on the same ligands.
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► Carbazole moiety enhances the photoluminescence intensity. ► Carbazole moiety increases the electrochemiluminescence property. ► Complexes with PF
6 anions exhibit better electroluminescence than that with Cl
−.
Six complexes (
1–
6) with the type of Ru(bpy)
2LX
2 (
1–
3: L
=
L1–
L3, X
=
Cl
−;
4–
6: L
=
L1–
L3, X
=
PF
6
−) were synthesized based on 2,2′-bipyridine and three 2,2′-bipyridine derivatives
L1,
L2 and
L3 (
L1
=
5,5′-dibromo-2,2′-bipyridine,
L2
=
5-bromo-5′-carbazolyl-2,2′-bipyridine,
L3
=
5,5′-dicarbazolyl-2,2′-bipyridine). The complexes
1–
6 were characterized by
1H NMR, MS(ESI) and IR spectra, along with the X-ray crystal structure analysis for
1,
5 and
6. Their photophysical properties and electrochemiluminescence (ECL) properties were investigated in detail. In the UV–Vis absorption spectra, all complexes
1–
6 show strong intraligand (π
→
π
∗) transitions and metal-ligand charge transfer (MLCT, dπ (Ru)
→
π
∗) bands. Upon the excitation wavelengths at ∼508
nm, all complexes
1–
6 exhibit typical MLCT emission of ruthenium(II) polypyridyl complexes. The introduction of carbazole moieties improves the MLCT absorption and emission intensity. The ruthenium(II) complexes
1–
6 exhibit good electrochemiluminescence (ECL) properties in Ru(bpy)
2L
2+/tri-
n-propylamine (TPrA) acetonitrile solution and the complexes with PF
6
− showed higher ECL emission intensity than that of the complexes with Cl
− based on the same ligands.
China has just started the study of undersea feature naming, compared to the USA, Russia, Germany and Japan, as rules of undersea feature naming and building of techniques and methods have not been ...systemized. Proposing names for the newly-discovered undersea features and participating in setting standardization of undersea feature names will help to enhance China's international status and influence, and also show China's international obligation and state strength.
Selective catalytic reduction of NOx by ammonia (NH3‐SCR) was affected by HCl, which was widely present in industrial flue gas. In this study, the SCR performances over MOx‐WO3/TiO2 (MW/Ti, M=Mn, Ce ...and V) catalysts after HCl treatment were investigated. It was found that HCl poisoning showed inhibition and promotion in NOx conversion over MnW/Ti and CeW/Ti catalysts, respectively. While the SCR activity over VW/Ti catalyst was hardly affected by HCl. Over MnW/Ti catalyst, the rupture of the Mn−O bond by the strong Mn−Cl binding induced the formation of amorphous MnCl2 species. This Cl‐containing species with Mn in a low oxidation state exhibited poorer redox ability and NO activation, resulting in a decrease in low‐temperature SCR activity. However, instead of directly affecting the CeOx and VOx sites, gaseous HCl reacted with NH3 to form NH4Cl species on the surface of CeW/Ti and VW/Ti catalysts. As a result, the SCR activity of VW/Ti catalyst was scarcely influenced by HCl, taking the unchanged redox ability and NH3 adsorption. With a further accumulation of NH4Cl on CeW/Ti catalyst, the NOx conversion at low temperature was evidently enhanced due to the promotion in NO‐to‐NO2 conversion (Fast‐SCR).
Influence of Poisoning Effects on Catalytic Reduction of NOx by NH3: HCl respectively exhibited promotion and suppression effects on the SCR activities of MnW/Ti and CeW/Ti, but had no impact on VW/Ti. For MnW/Ti−P, the inhibition of NO adsorption and activation decreased the SCR activity. Meanwhile, the promotion in “fast‐SCR” process successfully enhanced the SCR performance of CeW/Ti−P. However stable physicochemical properties maintained the NOx conversion of VW/Ti−P.
Gastric cancer (GC) remains a serious threat to human health with a high cancer-related death rate and unsatisfactory treatment effects after curative resection, especially with advanced GC. Thus, ...exploration of the molecular mechanism of cisplatin (CDDP) resistance in GC is crucial. circCCDC66 (hsa_circ_0001313) expression was detected by quantitative reverse-transcription PCR in GC cell lines and tissues. The characteristics of circCCDC66 in CDDP resistance in GC were evaluated in vivo and vitro. We performed luciferin reporter assays, biotin-coupled RNA pull-downs and fluorescence in situ hybridization (FISH) to assess the relationship of miR-618 to circCCDC66. Function was determined by cytotoxicity assay, western immunoblotting and TUNEL. CircCCDC66 was overexpressed in CDDP-resistant cells and tissues. The circCCDC66 expression was significantly associated with malignancy and was an independent risk factor for disease-free survival (DFS) in GC patients treated by CDDP based chemotherapy. Data from in vitro and vivo experiments demonstrated that circCCDC66 inhibited apoptosis by targeting miR-618 and release of B-cell lymphoma-2 (BCL2). CircCCDC66 is an essential regulator in the development of CDDP resistance and may serve as a promising therapeutic target for GC patients. Otherwise, our study adds more evidence of circRNA functioning as a sequestering agent for miRNA.
•We found circCCDC66 that was overexpressed in CDDP-resistant cells and tissues.•Ectopic circCCDC66 expression is associated with the aggressive characteristics and poor prognosis in GC patients treated by CDDP therapy.•The AUC of ROC was 81.5%, indicating that circCCDC66 may be a valid marker for predicting CDDP resistance in GC patients.•CircCCDC66 induced cisplatin resistance by targeting miR-618/BLC2 axis in vitro and vivo.
In this paper, a series of generalized structures based on coplanar stripline (CPS) has been intensively discussed. Featuring their intrinsic common-mode (CM) suppression, these proposed CPS-based ...arrangements could be intuitively designed solely upon the differential-mode (DM) equivalent circuit models as attributed to the inherently balanced transmission-line (TL) topologies. Consequently, a total of four kinds of advanced CPS-based configurations, including series-stub structure, shunt-stub structure, microstrip-to-CPS transition, and stepped-impedance multimode resonators (MMRs) have been thoroughly studied by virtue of the operating mechanism and synthesis design method.
A two-channel beamforming ultra-wideband (UWB) impulse transceiver chip, which includes a beam steering TX controlled by a fractional delay locked loop and an adaptive RX that can self-tune the ...beamforming to the direction of incident pulses, is presented. The dual-channel timed array transmitter can generate UWB pulses in two separate transmitter paths with tunable path delay difference of 0~250 ps to achieve beam-steering capability. Each beamforming receiver channel has a measured continuous time delay between 0~250 ps. The proposed beamformer could provide maximum scan angle of up to ±60° for two antennas with about 8-cm spacing. Fabricated in 0.18-μm CMOS, the TX can beam steer across the full spatial range with resolution of 4°, and the RX can continuously scan the full range with resolution of 3°. The transmitter consumes 37 mA at 10 Mbps and receiver consumes 84 mA under 1.8-V power supply.
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