[en] Highlights: • A novel symmetrical interdigital-loaded microstrip structure is presents. • A six-pole L-band HTS filter with four states has similar in-band responses. • The coupling coefficients between resonators keep unchanged during tuning. • The low loss HTS filter can be tuned from 1.382 GHz to 1.193 GHz. - Abstract: This paper presents a new symmetrical interdigital-loaded microstrip structure. The symmetrical structure can be applied to design a filter that can work at different frequencies. The filter has similar in-band response at each working frequency with low insertion loss. Based on the proposed structures, a low-loss six-pole high temperature superconducting (HTS) filter with four different working states is designed and fabricated. The center frequency of the filter can be tuned discretely from 1.382 GHz to 1.193 GHz. All four states have similar in-band characters, whereas the insertion losses are less than 0.3 dB. The measured results are consistent with the simulations.

[en] Highlights: •We design and fabricate an HTS band-pass filter with a very wide stopband. •The filter is designed using a method of staggered resonant modes. •A new topology of resonator suitable for this method is proposed. •The stopband is up to 26f₀ with rejection better than 60 dB. -- Abstract: This letter presents a novel high-temperature superconducting (HTS) band-pass filter with a very wide stopband using the method of staggered resonant modes, that is, dissimilar resonators with the same fundamental frequency but different harmonic frequencies. A new type of resonator that is suitable for this method is proposed. The design rules and design process of this method are analyzed in detail. A six-pole HTS band-pass filter centered at 500 MHz with a 2 MHz bandwidth is successfully designed and fabricated. Measured out-of-band rejection is better than 60 dB and can reach up to 13 GHz, which is about 26 times the fundamental frequency

[en] Highlights: • Channel filters are realized by suppressing nonadjacent couplings. • The T-type diplexer is proposed to reach a high isolation between channels. • The diplexer is optimized to avoid the influence of the metal box resonance. • The fabricated X-band diplexer has 70 dB isolation and 0.4 dB insertion loss. - Abstract: This paper presents a high performance X-band diplexer with a 65 MHz bandwidth operating at central frequencies of 9.90 and 10.02 GHz. Outstanding six-pole channel filters with a high out-of-band rejection are realized by utilizing a double-folded resonator and suppressing nonadjacent couplings on the basis of coupling analysis to improve the filtering performance of the diplexer. Two types of diplexers are compared in terms of isolation and packaging box's influence. The T-type topology is better than Y-type, and its isolation exceeds 70 dB. Moreover, the return loss and insertion loss is better than 13 dB and 0.4 dB respectively. The measurements agree well with the simulations, demonstrating that a high performance X-band diplexer with a compact size can be realized by HTS film apart from waveguide structure.

[en] Organic heterojunction thin-film transistors are fabricated based on copper phthalocyanine (CuPc) and hexadecafluorophtholocyaninatocopper (F₁₆CuPc) as double active layers, which exhibit typical ambipolar conduction. Several substrate temperatures are utilized to tune film morphology, which results in a remarkable change on the electric characteristics of organic transistors. The highest balanced mobility value of 2.91 x 10^-2 cm²/V s for hole and 1.04 x 10^-2 cm²/V s for electron are obtained by depositing F₁₆CuPc at 150 ^oC and CuPc at 200 ^oC, respectively, which are comparable to those conventional single-layer devices. This result demonstrates that the growth conditions of organic heterojunctions play a crucial role in ambipolar devices.

[en] Highlights: • We proposed a modified sliced line resonator with high power handling capability. • The peak current densities of all sliced lines in the resonator are almost equal. • A 10 W HTS filter was designed and fabricated. • The power handling capacity increases 76% compared with the sliced line resonator. - Abstract: In this article, a modified sliced-line resonator for high temperature superconducting (HTS) filters with high power handling capability is proposed. The resonator consists of 18 equal length lines in parallel with 3 unequal length lines on both outsides. The maximum current density of this kind of resonator is investigated and compared with the conventional microstrip line resonator and the sliced-line resonator. The simulations show that the resonator enables an increase of 76% power handling capability compared with the sliced-line resonator. A four-pole HTS filter with a centre frequency of 3.65 GHz and a bandwidth of 0.7% was designed and fabricated based on the proposed resonator. The measurements of the filter show a power handling capability more than 10 W

[en] Highlights: • The higher-order level spacing distributions along the MBL transition are fitted to the short-range plasma model (SRPM). • The SRPM reproduces the level statistics with high accuracy for the whole ergodic phase. • The effective model for the MBL transition point is verified to be SRPM with only nearest neighboring interactions. We study the level spacing distributions across the many-body localization (MBL) transition in random spin systems, and compare them to the short-range plasma model (SRPM) with interaction range k and inverse temperature β. It is found the level statistics within the ergodic phase fits well into SRPM, with the interaction range k decreases as randomness strength grows. Particularly, SRPM with only nearest level interactions ($k=1$) fits well with the physical data at the ergodic-MBL transition point identified by the inter-sample randomness, suggesting the former is the effective critical model with $\beta =1(2)$ for time-reversal invariant (broken) systems.

[en] A suspended-thin-sample (STS) approach for signal selection and contrast separation is developed in scanning electron microscopes with commonly used primary beam energies and traditional detectors. Topography contrast, electron channeling contrast and composition contrast are separated and largely enhanced from suspended thin samples of several hundred nanometers in thickness, which is less than the escape depth of backscattered electrons. This imaging technique enables to detect relatively pure secondary electron and elastic backscattered electron singles, whereas suppress multiple inelastic scattering effects. The provided contrast features are different from those of bulk samples, which are largely mixed with inelastic scattering effects. The STS imaging concept and method could be expected to have more applications in distinguishing materials of nanostructures, multilayers, compounds and composites, as well as in SEM-based electron backscatter diffraction, cathodoluminesence, and x-ray microanalysis. - Highlights: ●We developed a suspended-thin-sample (STS) method for contrast separation in the SEM. ●The STS method greatly enhances electron channeling contrast and composition contrast. ●Contrast separating was achieved by commonly utilized beam energies and detectors. ●The STS method provides higher resolution and much lower image noise

[en] Herein, a novel electrochemiluminescence resonance energy transfer (ECL-RET) biosensor using graphene quantum dots (GQDs) as donor and graphene oxide (GO) as acceptor for monitoring the activity of protein kinase was presented for the first time. Anti-phosphoserine antibody conjugated graphene oxide (Ab-GO) nonocomposite could be captured onto the phosphorylated peptide/GQDs modified electrode surface through antibody–antigen interaction in the presence of casein kinase II (CK2) and adenosine 5′-triphosphate (ATP), resulting in ECL from the GQDs quenching by closely contacting GO. This ECL quenching degree was positively correlated with CK2 activity. Therefore, on the basis of ECL-RET between GQDs and GO, the activity of protein kinase can be detected sensitively. This biosensor can also be used for quantitative analysis CK2 activity in serum samples and qualitative screening kinase inhibition, indicating the potential application of the developed method in biochemical fundamental research and clinical diagnosis. - Highlights: • We reported a novel ECL-RET biosensor for sensitive analysis of casein kinase II activity. • The successful ECL-RET between GQDs and GO could be established. • GQDs was employed for casein kinase II activity monitoring and inhibition assay. • Highly sensitive detection of CK2 activity and inhibition was achieved.

[en] Often, one achieves the dynamic balancing condition by resorting to counter-devices approach, however, by doing this, one adds extra weight and therefore the inertia are increased inside the whole system, which is not cost-effective when the system is sent into space and later used in space. In this study, it is suggested one is able to achieve the reactionless condition through combining the self-balanced system. For example, the dynamic balancing condition can be realized via the reconfiguration concept. Extra counter-mass is not employed but through reconfiguring the whole structure, in this way, the system will not get to be heavy and therefore, reduce the energy costs and make the system more applicable and flexible for space applications. Based on this concept, first and foremost, one needs to balance a single component through the reconfiguration approach (i.e. decomposition process) and after that integrate the above balanced components to build the entire system (i.e. integration process). Finally, with the mechanical reconfiguration, the control laws governing the operation of the mechanism also need to be changed, so as to make whole systems more flexible when they are used in space. (paper)

[en] Hawking radiation is usually studied in standard coordinates. In this paper, we calculate the Hawking temperature of a Schwarzschild black hole in harmonic coordinates, as well as that of a Reissner–Nordström black hole. The action of a scalar field near the event horizon can be formulated exactly without omitting some high-order terms. We show dimensional reduction for Hawking temperature is also valid for harmonic coordinates, and verify further that the results are independent on concrete coordinates. With the help of Lorentz transformation, our work might also serve as a basis to investigate the thermal radiation from a moving black hole. (paper)