bluuebunny/crossref_metadata_2025 huggingface dataset:
'I'm never going to change unless someone tells me I need to': fostering feedback dialogue between general practice supervisors and registrars
Authors: Denny Bianca , Brown James , Kirby Catherine , Garth Belinda , Chesters Janice , Nestel Debra
Published: August 2019

Feedback is often unidirectional and focused on learners receiving feedback. Learning relationships are viewed as influential to promoting feedback dialogue. The aim of this study was to explore factors that facilitate or impede feedback between general practice supervisors and registrars. An in-depth qualitative study was conducted. Data collection featured semistructured interviews with registrars (n = 9) and supervisors (n = 5). Interviews were audio recorded and analysed interpretatively. Feedback was affected by personal (i.e. resilience, humility), relational (i.e. strength of supervisory relationship, power differentials) and contextual (i.e. culture) factors. Registrars are not accustomed to providing feedback and supervisors do not typically request feedback. Past feedback experiences affect registrar engagement in feedback exchanges. A culture of feedback dialogue within training organisations and training practices is essential. Power imbalance needs to be addressed, particularly for feedback by registrars. Strategies to develop feedback skills and promote an open feedback culture are essential.
HumanGNPTABstuttering mutations engineered into mice cause vocalization deficits and astrocyte pathology in the corpus callosum
Authors: Han Tae-Un , Root Jessica , Reyes Laura D. , Huchinson Elizabeth B. , Hoffmann Johann du , Lee Wang-Sik , Barnes Terra D. , Drayna Dennis
Published: August 2019

Significance

Stuttering is a common neurodevelopmental disorder. However, the neurological causes of this disorder are poorly understood. The disorder is highly genetic, and recent discoveries have found several genes involved in this disorder, but how these lead to the unique clinical features of stuttering has been unknown. We have shown that mice carrying human stuttering mutations display vocalization deficits that recreate the salient features of human stuttering. In these mice, we have used several different complementary techniques to identify a specific deficit in astrocytes, a type of glial cell prominent in white matter tracts, particularly in the corpus callosum of these mice. These findings suggest astrocytes as a site of the neuropathology, leading to a deficit in interhemispheric connectivity in stuttering.
Akt phosphorylation of neuronal nitric oxide synthase regulates gastrointestinal motility in mouse ileum
Authors: Guerra Damian D. , Bok Rachael , Vyas Vibhuti , Orlicky David J. , Lorca Ramón A. , Hurt K. Joseph
Published: August 2019

Significance

Neuronal nitric oxide synthase (nNOS) is believed to be activated primarily by Ca2+/calmodulin. Activation of nNOS by phosphorylation similar to endothelial NOS has been suggested but is technically difficult to confirm in vivo. We developed a knock-in mouse with nNOS serine1412 mutated to alanine and show using mouse ileum that nNOS phosphoserine1412 regulates gastrointestinal smooth muscle relaxation and functional motility. nNOS is phosphorylated by the protein kinase Akt during submaximal neuronal depolarization to augment NO-cGMP signaling in a manner tuned toward resting intracellular Ca2+levels. Phosphorylation at nNOS serine1412 represents a previously unrecognized physiologic mechanism of nNOS regulation linking neuronal depolarization to gastrointestinal motility and clarifies characteristics of neuronal NO production.
Structural and functional analyses of photosystem II in the marine diatom
Phaeodactylum tricornutum
Authors: Levitan Orly , Chen Muyuan , Kuang Xuyuan , Cheong Kuan Yu , Jiang Jennifer , Banal Melissa , Nambiar Nikhita , Gorbunov Maxim Y. , Ludtke Steven J. , Falkowski Paul G. , Dai Wei
Published: August 2019

A descendant of the red algal lineage, diatoms are unicellular eukaryotic algae characterized by thylakoid membranes that lack the spatial differentiation of stroma and grana stacks found in green algae and higher plants. While the photophysiology of diatoms has been studied extensively, very little is known about the spatial organization of the multimeric photosynthetic protein complexes within their thylakoid membranes. Here, using cryo-electron tomography, proteomics, and biophysical analyses, we elucidate the macromolecular composition, architecture, and spatial distribution of photosystem II complexes in diatom thylakoid membranes. Structural analyses reveal 2 distinct photosystem II populations: loose clusters of complexes associated with antenna proteins and compact 2D crystalline arrays of dimeric cores. Biophysical measurements reveal only 1 photosystem II functional absorption cross section, suggesting that only the former population is photosynthetically active. The tomographic data indicate that the arrays of photosystem II cores are physically separated from those associated with antenna proteins. We hypothesize that the islands of photosystem cores are repair stations, where photodamaged proteins can be replaced. Our results strongly imply convergent evolution between the red and the green photosynthetic lineages toward spatial segregation of dynamic, functional microdomains of photosystem II supercomplexes.
Generalized size scaling of metabolic rates based on single-cell measurements with freshwater phytoplankton
Authors: Zaoli Silvia , Giometto Andrea , Marañón Emilio , Escrig Stéphane , Meibom Anders , Ahluwalia Arti , Stocker Roman , Maritan Amos , Rinaldo Andrea
Published: August 2019

Significance

Empirical laws predicting metabolic rates of a species by its average body mass neglect intraspecies variability arising from the range of physiologically feasible rates and phenotypic heterogeneity. We describe an exploratory experimental test of a theory that explicitly accounts for such variations. We show, by single-cell joint measurements of mass and uptake rates, how marginal distributions of mass and rates collapse onto a common master distribution for species spanning 3 orders of magnitude in cell volume. These results demonstrate the potential of a generalized scaling theory that goes beyond population averages to incorporate within-species variation.
The catalytic core of DEMETER guides active DNA demethylation in
Arabidopsis
Authors: Zhang Changqing , Hung Yu-Hung , Rim Hyun Jung , Zhang Dapeng , Frost Jennifer M. , Shin Hosub , Jang Hosung , Liu Fang , Xiao Wenyan , Iyer Lakshminarayan M. , Aravind L. , Zhang Xiang-Qian , Fischer Robert L. , Huh Jin Hoe , Hsieh Tzung-Fu
Published: August 2019

The
Arabidopsis
DEMETER (DME) DNA glycosylase demethylates the maternal genome in the central cell prior to fertilization and is essential for seed viability. DME preferentially targets small transposons that flank coding genes, influencing their expression and initiating plant gene imprinting. DME also targets intergenic and heterochromatic regions, but how it is recruited to these differing chromatin landscapes is unknown. The C-terminal half of DME consists of 3 conserved regions required for catalysis in vitro. We show that this catalytic core guides active demethylation at endogenous targets, rescuing
dme
developmental and genomic hypermethylation phenotypes. However, without the N terminus, heterochromatin demethylation is significantly impeded, and abundant CG-methylated genic sequences are ectopically demethylated. Comparative analysis revealed that the conserved DME N-terminal domains are present only in flowering plants, whereas the domain architecture of DME-like proteins in nonvascular plants mainly resembles the catalytic core, suggesting that it might represent the ancestral form of the 5mC DNA glycosylase found in plant lineages. We propose a bipartite model for DME protein action and suggest that the DME N terminus was acquired late during land plant evolution to improve specificity and facilitate demethylation at heterochromatin targets.
Quantum Approach to Fast Protein-Folding Time*
Authors: Lu Li-Hua , Li You-Quan
Published: August 2019

In the traditional random-conformational-search model, various hypotheses with a series of meta-stable intermediate states were proposed to resolve the Levinthal paradox in protein-folding time. Here we introduce a quantum strategy to formulate protein folding as a quantum walk on a definite graph, which provides us a general framework without making hypotheses. Evaluating it by the mean of first passage time, we find that the folding time via our quantum approach is much shorter than the one obtained via classical random walks. This idea is expected to evoke more insights for future studies.
High-efficiency triple-resonant inelastic light scattering in planar optomagnonic cavities
Authors: Pantazopoulos Petros Andreas , Tsakmakidis Kosmas L , Almpanis Evangelos , Zouros Grigorios P , Stefanou Nikolaos
Published: August 2019

Optomagnonic cavities have recently been emerging as promising candidates for implementing coherent photon-magnon interactions, for applications in quantum memories and devices, and next generation quantum networks. A key challenge in the design of such cavities is the attainment of high magnon-mediated optical-to-optical conversion efficiencies, which could, e.g., be exploited for efficient optical interfacing of superconducting qubits, as well as the practicality of the final designs, which ideally should be planar and amenable to on-chip integration. Here, on the basis of a novel time-Floquet scattering-matrix approach, we report on the design and optimization of a planar, multilayer optomagnonic cavity, incorporating a cerium-substituted yttrium iron garnet thin film, magnetized in-plane, and operating in the triple-resonant inelastic light scattering regime. This architecture allows for magnon-mediated optical-to-optical conversion efficiencies of about 5% under realistic conditions, which is orders of magnitude higher than that attained in alternative optomagnonic designs. Our results suggest a viable way forward for realizing practical information inter-conversion, with high efficiencies, between microwaves, strongly coupled to magnons, and optical photons, as well as a platform for fundamental studies of classical and quantum dynamics in magnetic solids and for the implementation of futuristic quantum devices.
The evolution of cooperation in public good game with deposit*
Authors: Wang Xian-Jia , Chen Wen-Man
Published: August 2019

The emergence of cooperation still remains a fundamental conundrum in the social and behavior sciences. We introduce a new mechanism, deposit mechanism, into theoretical model to explore how this mechanism promotes cooperation in a well-mixed population. Firstly, we extend the common binary-strategy combination of cooperation and defection in public good game by adding a third strategy, namely, deposit cooperation. The players with deposit cooperation strategy pay a deposit in advance to obtain the benefits of public good at a lower contributions compared with the players with cooperation strategy, when the provision of public good is successful. Then, we explore the evolution of cooperation in the public good game with deposit by means of the replicator dynamics. Theoretical computations and stimulations show that the deposit mechanism can promote cooperation in a well-mixed population, and the numbers of equilibrium point are determined by variables of public good game. On the one hand, when the coexistence of cooperators and defectors is the stable equilibrium point in the evolutionary system, increasing the threshold of public good and adopting the weak altruism way for share benefits can enhance the level of cooperation in the population. On the other hand, if the coexistence of deposit cooperators and defectors is the stable equilibrium point, it is effective to promote the deposit cooperation by lowering the values of discount and deposit, and raising the threshold of public good.
On a biseparability criterion of bipartite qudit state
Authors: Benzimoun B , Daoud M
Published: August 2019

In this paper, we propose a new approach to tackle the separability problem for bipartite qudit mixed-states. This is based on the Majorana representation which allows to represent a N-spinors (qudit) as a symmetric state of N spin-1/2. We also discuss how we can exploit such representation and the notion of the biseparability of multipartite qubit states in the sense to establish new criteria of the separability problem based on the PPT and concurrence.
Controlling Rydberg excitation process with shaped intense ultrashort laser pulses*
Authors: Zhao Xiao-Yun , Wang Chun-Cheng , Hu Shi-Lin , Li Wei-Dong , Chen Jing , Hao Xiao-Lei
Published: August 2019

We perform a theoretical investigation on the control over the atomic excitation of Rydberg states with shaped intense ultrashort laser pulses. By numerically solving the time-dependent Schrödinger equation (TDSE), we systematically study the dependence of the population of the Rydberg states on the π phase step position in the frequency spectra of the laser pulse for different intensities, central wavelengths and pulse durations. Our results show that the Rydberg excitation process can be effectively modulated using shaped intense laser pulses with the laser intensity as high as 1×1014 W/cm2. Our work also have benefit to the future investigation to find out the dominant mechanism behind the excitation of Rydberg states in strong laser fields.
Synthesis and surface plasmon resonance of Au–ZnO Janus nanostructures*
Authors: Zhou Jun , Zhang Jian-Shuo , Xian Guo-Yu , Qi Qi , Gu Shang-Zhi , Shen Cheng-Min , Cheng Zhao-Hua , He Sheng-Tai , Yang Hai-Tao
Published: August 2019

Metal–semiconductor Janus nanostructures with asymmetry and directionality have recently aroused significant interest, both in fundamental light–matter interactions mechanism and in technological applications. Here we report the synthesis of different Au–ZnO Janus nanostructures via a facile one-pot colloid method. The growth mechanism is revealed by a series of designed synthesis experiments. The light absorption properties are determined by both the decrease of dipole oscillations of the free electrons and the plasmon-induced hot-electron transfer. Moreover, the finite-difference time-domain (FDTD) simulation method is used to elucidate the electric field distributions of these Janus nanostructures.
Optical design of common-aperture multispectral and polarization optical imaging system with wide field of view*
Authors: Liu Xin , Chang Jun , Feng Shuai , Mu Yu , Wang Xia , Xu Zhao-Peng
Published: August 2019

Multispectral and polarization cameras that can simultaneously acquire the spatial, spectral, and polarization characteristics of an object have considerable potential applications in target detection, biomedical imaging, and remote sensing. In this work, we develop a common-aperture optical system that can capture multispectral and polarization information. An off-axis three-mirror optical system is mounted on the front end of the proposed system and used as a common-aperture telescope in the visible light (400 nm–750 nm) and long-wave infrared (LWIR,

8

μ
m
−
12

μ
m

) waveband. The system can maintain a wide field of view (4.5°) and it can demonstrate an enhanced identification ability. The off-axis three-mirror system gets rid of central obscuration while further yielding stable system resolution and energy. Light that has passed through the front-end common-aperture reflection system is divided into the visible light and LWIR waveband by a beamsplitter. The two wavebands then converge on two detectors through two groups of lenses. Our simulation results indicate that the proposed system can obtain clear images in each waveband to meet the diverse imaging requirements.
Zinc-oxide nanoparticle-based saturable absorber deposited by simple evaporation technique for Q-switched fiber laser*
Authors: Aloyah Syed Husin Syarifah , Diana Muhammad Farah , Azurahanim Che Abdullah Che , Huzaimah Ribut Siti , Zamani Zulkifli Mohd , Adzir Mahdi Mohd
Published: August 2019

A Q-switched erbium-doped fiber laser (EDFL) incorporating zinc-oxide (ZnO) nanoparticles-based saturable absorber (SA) is proposed and demonstrated. To form the SA, the ZnO nanoparticles, which are originally in the powder form, are first dissolved in ethanol and subsequently deposited onto the surface of fiber ferrule by using the adhesion effect with the evaporation technique. By integrating the ZnO nanoparticle-based SA into a laser cavity of an EDFL, a self-started and stable Q-switching is achieved at a low threshold power of 20.24 mW. As the pump power is increased, the pulse repetition rate is tunable from 10.34 kHz to 25.59 kHz while pulse duration decreases from

21.39

μ
s

to

3.65

μ
s

. Additionally, this Q-switched laser has a maximum energy per pulse of 19.34 nJ and an average output power of 0.46 mW. These results indicate the feasibility and functionality of the ZnO nanoparticles-based SA for Q-switched generation, which offers the flexibility and easy integration of the SA into a ring laser cavity.
Pulse generation of erbium-doped fiber laser based on liquid-exfoliated FePS3*
Authors: Yin Qing , Wang Jin , Shi Xin-Yao , Wang Tao , Yang Jie , Zhao Xin-Xin , Shen Zhen-Jiang , Wu Jian , Zhang Kai , Zhou Pu , Jiang Zong-Fu
Published: August 2019

As a preferable material in the field of photo-detection and catalysis, the characteristics of FePS3 in broad wavelength range have been proven by many experimental studies. However, FePS3 has not been used as a saturable absorber (SA) in fiber lasers yet. We propose and demonstrate the generation of a single wavelength and dual-wavelength based on an Er-doped fiber laser (EDFL) at

1.5

μ
m

by using an innovative FePS3 saturable absorber for the first time. The result shows that a stable passively Q-switched pulse can be generated, which demonstrates that the new two-dimensional (2D) material FePS3 served as SA provides a valid method to realize passively Q-switched laser. In addition, we achieve the output of the dual-wavelength pulse by properly rotating the polarization controller. To the best of our knowledge, the dual-wavelength pulse EDFL could be applied in biomedicine, spectroscopy, and sensing research.
Multi-wavelength continuous-wave Nd:YVO4 self-Raman laser under in-band pumping*
Authors: Fan Li , Zhao Xiao-Dong , Zhang Yun-Chuan , Gu Xiao-Dong , Wan Hao-Peng , Fan Hui-Bo , Zhu Jun
Published: August 2019

Multi-wavelength continuous-wave self-Raman laser with an a-cut composite YVO4/Nd:YVO4/YVO4 crystal pumped by an 879-nm wavelength-locked laser diode is demonstrated for the first time. Multi-wavelength Raman lasers at 1168.4, 1176, 1178.7, and 1201.6 nm are achieved by the first Stokes shift of the multi-wavelength fundamental lasers at 1064, 1066.7, 1073.6, 1084, and 1085.6 nm with two Raman shifts of 890 and 816 cm−1. A maximum Raman output power of 2.56 W is achieved through the use of a 20-mm-long composite crystal, with a corresponding optical conversion efficiency of 9.8%. The polarization directions of different fundamental and Raman lasers are investigated and found to be orthogonal π and σ polarizations. These orthogonally polarized multi-wavelength lasers with small wavelength separation pave the way to the development of a potential laser source for application in spectral analysis, laser radar and THz generation.
Non-Stokes drag coefficient in single-particle electrophoresis: New insights on a classical problem
Authors: Liao Mai-Jia , Wei Ming-Tzo , Xu Shi-Xin , Daniel Ou-Yang H , Sheng Ping
Published: August 2019

We measured the intrinsic electrophoretic drag coefficient of a single charged particle by optically trapping the particle and applying an AC electric field, and found it to be markedly different from that of the Stokes drag. The drag coefficient, along with the measured electrical force, yield a mobility-zeta potential relation that agrees with the literature. By using the measured mobility as input, numerical calculations based on the Poisson–Nernst–Planck equations, coupled to the Navier–Stokes equation, reveal an intriguing microscopic electroosmotic flow near the particle surface, with a well-defined transition between an inner flow field and an outer flow field in the vicinity of electric double layer’s outer boundary. This distinctive interface delineates the surface that gives the correct drag coefficient and the effective electric charge. The consistency between experiments and theoretical predictions provides new insights into the classic electrophoresis problem, and can shed light on new applications of electrophoresis to investigate biological nanoparticles.
Novel transit-time oscillator (TTO) combining advantages of radial-line and axial TTO*
Authors: Xu Wei-Li , He Jun-Tao , Ling Jun-Pu , Song Li-Li , Deng Bing-Fang , Dai Ouzhixiong , Ge Xing-Jun
Published: August 2019

A novel transit-time oscillator (TTO) is proposed in this paper. An axial cathode which has been widely used in high power microwave (HPM) source and an extractor with radial feature are adopted. In this way, the inherent advantages of axial and radial TTO, both of which can be utilized as high-quality intense relativistic electron beam (IREB), can be generated and the power capacity is also increased. The working mode is π/2 mode of TM01 based on small-signal theory, and under the same energy storage, the maximum electric field in extractor decreases 16.3%. Besides, by utilizing the natural bending of the solenoid, this TTO saves over 60% of the length required by the uniform magnetic field, and consequently reduces the energy consumed by solenoid. The PIC simulation shows that by using 1.0-T decreasing magnetic field generated by the shorter solenoid, 3.37-GW microwave at 12.43 GHz is generated with 620-kV and 13.27-kA input, and the overall conversion efficiency is 41%.
Effects of surface charges on phonon properties and thermal conductivity in GaN nanofilms*
Authors: Yang Shu-Sen , Hou Yang , Zhu Lin-Li
Published: August 2019

Surface charges can modify the elastic modulus of nanostructure, leading to the change of the phonon and thermal properties in semiconductor nanostructure. In this work, the influence of surface charges on the phonon properties and phonon thermal conductivity of GaN nanofilm are quantitatively investigated. In the framework of continuum mechanics, the modified elastic modulus can be derived for the nanofilm with surface charges. The elastic model is presented to analyze the phonon properties such as the phonon dispersion relation, phonon group velocity, density of states of phonons in nanofilm with the surface charges. The phonon thermal conductivity of nanofilm can be obtained by considering surface charges. The simulation results demonstrate that surface charges can significantly change the phonon properties and thermal conductivity in a GaN nanofilm. Positive surface charges reduce the phonon energy and phonon group velocity but increase the density of states of phonons. The surface charges can change the size and temperature dependence of phonon thermal conductivity of GaN nanofilm. Based on these theoretical results, one can adjust the phonon properties and temperature/size dependent thermal conductivity in GaN nanofilm by changing the surface charges.
Measurement scheme to detect α relaxation time of glass-forming liquid*
Authors: Zhao Xing-Yu , Wang Li-Na , Yin Hong-Mei , Zhou Heng-Wei , Huang Yi-Neng
Published: August 2019

A measurement scheme for detecting the α relaxation time (τ) of glass-forming liquid is proposed, which is based on the measured ionic conductivity of the liquid doped with probing ions by low- and middle-frequency dielectric spectroscopy and according to the Nernst–Einstein, Stokes–Einstein, and Maxwell equations. The obtained τ values of glycerol and propylene carbonate by the scheme are consistent with those obtained by traditional dielectric spectroscopy, which confirms its reliability and accuracy. Moreover, the τ of 1,2-propanediol in a larger temperature range is compared with existing data.
Energy band alignment at Cu2O/ZnO heterojunctions characterized by in situ x-ray photoelectron spectroscopy*
Authors: Zhao Yan , Yin Hong-Bu , Fu Ya-Jun , Wang Xue-Min , Wu Wei-Dong
Published: August 2019

With the increasing interest in Cu2O-based devices for photovoltaic applications, the energy band alignment at the Cu2O/ZnO heterojunction has received more and more attention. In this work, a high-quality Cu2O/ZnO heterojunction is fabricated on a c-Al2O3 substrate by laser-molecular beam epitaxy, and the energy band alignment is determined by x-ray photoelectron spectroscopy. The valence band of ZnO is found to be 1.97 eV below that of Cu2O. A type-II band alignment exists at the Cu2O/ZnO heterojunction with a resulting conduction band offset of 0.77 eV, which is especially favorable for enhancing the efficiency of Cu2O/ZnO solar cells.
Thermal stability, crystallization, and magnetic properties of FeNiBCuNb alloys*
Authors: Chen Zhe , Zhu Qian-Ke , Zhang Shu-Ling , Zhang Ke-Wei , Jiang Yong
Published: August 2019

Amorphous (Fe40Ni40B19Cu1)100−x
Nb
x
(x = 1, 3, 5, 7) ribbons are prepared by using the melt-spinning method. We find that the glass forming ability (GFA) of the as-melt spun ribbons is significantly improved by adding Nb element. In addition, the thermal stability evaluated in steps of

Δ
T
=

T

x
2

−

T

x
1

effectively increases from 16 K to 75 K with Nb content increasing. The as-melt spun (Fe40Ni40B19Cu1)97Nb3 ribbon exhibits a lowest coercivity of 2 A/m and relatively large saturation magnetization of

103.7

A
·

m

2

/

kg

and thus it can be further treated by being annealed at 809 K. The crystallization behavior is confirmed to be determined by two individual crystallization processes corresponding to the precipitation of (Fe,Ni)23B6 phase and γ-(Fe,Ni) phase. With increasing annealing time, the single (Fe,Ni)23B6 phase can be transformed into a mixture of (Fe,Ni)23B6 and γ-(Fe,Ni) phase, and the grain size of γ-(Fe, Ni) phase increases from 5 nm to 80 nm while the grain size of (Fe,Ni)23B6 remains almost unchanged. Finally, we find that the grain growth in each of (Fe,Ni)23B6 and γ-(Fe, Ni) deteriorates the overall magnetic properties.
Spectral properties of Pr:CNGG crystals grown by micro-pulling-down method*
Authors: Xue Yan-Yan , Li Na , Hu Dong-Hua , Song Qing-Song , Xu Xiao-Dong , Wang Dong-Hai , Wang Qing-Guo , Li Dong-Zhen , Wang Zhan-Shan , Xu Jun
Published: August 2019

Pr3+-doped calcium niobium gallium garnet (Pr:CNGG) single crystals with different Pr3+concentrations are successfully grown by the micro-pulling-down (μ-PD) method. The crystal structure, room-temperature absorption spectra, and fluorescence spectra of Pr:CNGG crystals are measured and discussed. The fluorescence results indicate their large dependence on the doping concentration. The fluorescence lifetime of the

D

2

1

energy level is also determined. The results indicate that Pr:CNGG crystal could be a potential solid-state laser gain medium.
Thin-film growth behavior of non-planar vanadium oxide phthalocyanine*
Authors: Liu Tian-Jiao , Xia Hua-Yan , Liu Biao , S Jones Tim , Fang Mei , Yang Jun-Liang
Published: August 2019

The thin film properties of organic semiconductors are very important to the device performance. Herein, non-planar vanadyl phthalocyanine (VOPc) thin films grown on rigid substrates of indium tin oxide, silicon dioxide, and flexible substrate of kapton by organic molecular beam deposition under vacuum conditions are systematically studied via atomic force microscopy and x-ray diffraction. The results clearly reveal that the morphology and grain size are strongly dependent on the substrate temperature during the process of film deposition. Meanwhile, the VOPc films with the structure of phase I or phase II can be modulated via in situ annealing and post-annealing temperature. Furthermore, the crystalline structure and molecular orientation of vapor-deposited VOPc can be controlled using molecular template layer 3, 4, 9, 10-perylene-tetracarboxylic dianhydride (PTCDA), the VOPc film of which exhibits the phase I structure. The deep understanding of growth mechanism of non-planar VOPc film provides valuable information for controlling structure-property relationship and accelerates the application in electronic and optoelectronic devices.
Structural response of aluminum core–shell particles in detonation environment*
Authors: Jiao Qing-Jie , Wang Qiu-Shi , Nie Jian-Xin , Pei Hong-Bo
Published: August 2019

Natural aluminum particles have the core–shell structure. The structure response refers to the mechanical behavior of the aluminum particle structure caused by external influences. The dynamic behavior of the structural response of aluminum core–shell particles before combustion is of great importance for the aluminum powder burning mechanism and its applications. In this paper, an aluminum particle combustion experiment in a detonation environment is conducted and analyzed; the breakage factors of aluminum particles shell in detonation environment are analyzed. The experiment results show that the aluminum particle burns in a gaseous state and condenses into a sub-micron particle cluster. The calculation and simulation demonstrate that the rupture of aluminum particle shell in the detonation environment is mainly caused by the impact of the detonation wave. The detonation wave impacts the aluminum particles, resulting in shell cracking, and due to the shrinkage-expansion of the aluminum core and stripping of the detonation product, the cracked shell is fractured and peeled with the aluminum reacting with the detonation product.
Negative gate bias stress effects on conduction and low frequency noise characteristics in p-type poly-Si thin-film transistors*
Authors: Han Chao-Yang , Liu Yuan , Liu Yu-Rong , Chen Ya-Yi , Wang Li , Chen Rong-Sheng
Published: August 2019

The instability of p-channel low-temperature polycrystalline silicon thin film transistors (poly-Si TFTs) is investigated under negative gate bias stress (NBS) in this work. Firstly, a series of negative bias stress experiments is performed, the significant degradation behaviors in current–voltage characteristics are observed. As the stress voltage decreases from −25 V to −37 V, the threshold voltage and the sub-threshold swing each show a continuous shift, which is induced by gate oxide trapped charges or interface state. Furthermore, low frequency noise (LFN) values in poly-Si TFTs are measured before and after negative bias stress. The flat-band voltage spectral density is extracted, and the trap concentration located near the Si/SiO2 interface is also calculated. Finally, the degradation mechanism is discussed based on the current–voltage and LFN results in poly-Si TFTs under NBS, finding out that Si–OH bonds may be broken and form Si* and negative charge OH− under negative bias stress, which is demonstrated by the proposed negative charge generation model.
Exploring alkylthiol additives in PBDB-T:ITIC blended active layers for solar cell applications*
Authors: Li Xiang , He Zhiqun , Sun Mengjie , Zhang Huimin , Guo Zebang , Xu Yajun , Li Han , Liang Chunjun , Jing Xiping
Published: August 2019

Bulk heterojunction, non-fullerene PBDB-T:ITIC blend polymer solar cells have been fabricated. The active layers consisting of PBDB-T as a donor and ITIC as an acceptor are optimized using a series of alkylthiol additives (1,3-propanedithiol, 1,4-butanedithiol, and 1,8-octanedithiol). It is found that the donor and acceptor are phase separated with different crystalline domains. The additives effectively re-organize the morphology and extend the molecule ordering in lamellar structure with increased correlation length in ITIC domain, benefiting the generation and dissociation of exciton and reducing charge recombination. A substantial improvement in power conversion efficiency of the devices from 8.13% to 9.44% is observed. This study shows that the application of alkylthiol additives is a simple and effective approach to improve the device performance in solar cells based on polymer/non-fullerene blend system.
Optimal estimation of the amplitude of signal with known frequency in the presence of thermal noise*
Authors: Luo Jie , Ke Jun , Liu Yi-Chuan , Zhang Xiang-Li , Yin Wei-Ming , Shao Cheng-Gang
Published: August 2019

In the torsion pendulum experiments, the thermal noise sets the most fundamental limit to the accurate estimation of the amplitude of the signal with known frequency. The variance of the conventional method can meet the limit only when the measurement time is much longer than the relaxation time of the pendulum. By using the maximum likelihood estimation and the equation-of-motion filter operator, we propose an optimal (minimum variance, unbiased) amplitude estimation method without limitation of the measurement time, where thermal fluctuation is the leading noise. While processing the experimental data tests of the Newtonian gravitational inverse square law, the variance of our method has been improved than before and the measurement time of determining the amplitude with this method has been reduced about half than before for the same uncertainty. These results are significant for the torsion experiment when the measurement time is limited.
Hyperuniformity and static structure factor of amorphous silicon in the infinite-wavelength limit
Authors: Dahal Devilal , Atta-Fynn Raymond , Elliott S. R. , Biswas Parthapratim
Published: August 2019

The static structure factor of amorphous silicon (a-Si) models, containing 400,000 atoms with a density of 2.25 g⋅cm−3, has been studied by generating atomistic models using classical molecular-dynamics simulations. The behavior of the structure factor, S(Q), in the limit Q → 0, is examined to determine the degree of hyperuniformity in a-Si and is compared with the results with those from earlier simulations and small-angle X-ray scattering experiments. The study suggests that the computed value of the relative variance of the number of atoms at large distances, and hence S(Q → 0), lies in the range from 0.00736 to 0.00758, which is very close to the experimental value of 0.0076 ± 0.0005, obtained from an extrapolation of transmission X-ray scattering data in the small-angle region. The non-zero value of the structure factor S(0) in a-Si can be attributed to density fluctuations on a very large length scale, which is a characteristic property of the structural and topological ordering of silicon atoms in the amorphous state.
Domain walls in strontium titanate
Authors: Stephen Hellberg C.
Published: August 2019

Density functional theory calculations of twin-domain walls in strontium titanate are presented. The two possible domain walls are characterized. The domain wall type is set by the relative phase of the octahedral rotations in the body-centered-tetragonal SrTiO3on either side of the domain wall. The width of the domain walls is estimated to be approximately 3 nm.
Quantum Search on Networks
Authors: Boettcher Stefan
Published: August 2019

We find a lower bound on the computational complexity of Grover’s quantum search algorithms in low-dimensional networks using the renormalization group (RG). It highlights the competition between Grover’s abstract algorithm, i.e., a rotation in Hilbert space, and quantum transport in an actual geometry. It can be characterized in terms of the quantum walk dimension

d
w
Q

and the spatial (fractal) dimension df
or, alternatively, the spectral dimension of the network, ds
, even when translational invariance is broken.
On selected issues of Boolean function application in symmetric key cryptography against side channel attacks
Authors: Seman Kamaruzzaman , Roslan Muhammad Fahim , Ab Halim Azni Haslizan , Syam Mohd Sayuti M Nor Azizi
Published: August 2019

Boolean function plays a prominent role in building strong cryptography algorithm especially in symmetric block cipher. However, there may be some issues and conflicting criteria which prevent such a Boolean function to resist the algorithm to all known attacks. Within this work, the nonlinearity and correlation immunity issues of Boolean function is discussed followed by complementary counter measure against side channel attack especially differential power attack (DPA)
Naive Bayes classifier for infant weight prediction of hypertension mother
Authors: Desiani Anita , Primartha Rifkie , Arhami Muhammad , Orsalan Osvari
Published: August 2019

Classification is one method of data analysis in data mining that is used to form a model in order to describe the appropriate data class or model that predicts data trends. The Usage of classification has been applied in various areas, including in health areas. One of the classification methods used is Naive Bayes. This study aims to predict the weight of infants in maternal hypertensive and nonhypertensive conditions with Naive Bayes method. Data were taken as many as 219 data from pregnant women based on the medical record in Obstetrics and Gynecology of Muhammadiyah Palembang Hospital from January 1017 until September 2017. Data is divided into two groups, 188 for training data and 31 data for testing data. The performance data analysis was using WEKA and the results showed that the Naive Bayes’s accuracy is 80.372%. the accuracy score means Naive Bayes works well to predict the weight of infants in maternal hypertensive and nonhypertensive mothers. The result is expected to be a reference for others research by comparing it with other classification methods and incorporating other factors in pregnancy and multiple births or other factors.
Joint life insurance based on Gompertz assumptions and interest rate affected by the excange rate
Authors: Zayanti Des Alwine , Kresnawati Endang Sri , Megah Mulya
Published: August 2019

This paper discussed about Calculation of joint life insurance premiums based on Gompertz mortality assumptions that affect the probability of joint insurance participants. One important variable in calculating premiums and reserves is interest rates. The foreign exchange rate is the price of a currency if exchanged with another countrys currency. Depreciation in the foreign exchange rate causes fluctuations in interest rates which ultimately affect the calculation of premiums for joint life insurance. Based on the calculation results, the greater the depreciation value, the greater the interest rate. This will increase risk for insurance companies. Calculation of insurance premiums that are affected by dollar fluctuations, is expected to be able to obtain calculations that are in accordance with the world economic trends.
A non-proportional hazards model with time-dependent variables for under-five mortality in Indonesia
Authors: Faruk Alfensi , Syahputra Erlan , Cahyono Endro Setyo , Aisyah Sari Mutiara
Published: August 2019

Cox proportional hazards (PH) is known as the most popular model for the analysis of multivariate survival data. The main assumption of the model is that the hazard ratio among any two individuals in the population is constant over time. The violation of this assumption, however, may cause serious issues such as overestimation or underestimation of hazard risks and reducing the power of related statistical tests. The main objective of this research, therefore, is to extend the Cox PH model by adding time-dependent variables into the model to cope with the presence of non-PH. The proposed model, moreover, is applied to under-five mortality data based on Indonesian Demographic and Health Survey (IDHS) 2012. The results showed that the Akaike’s Information Criterion (AIC) and Bayesian Information Criterion (BIC) values of the extended Cox model with time-dependent variables are much lower than the Cox PH model. This means that the extended Cox model can increase significantly the goodness-of-fit of the Cox PH model to under-five mortality data in Indonesia.
Pattern recognation for study period of student in Mathematics Department with C4.5 algorithm data mining technique at the Faculty of Mathematics and Natural Science Universitas Sriwijaya
Authors: Yahdin Sugandi , Desiani Anita , Amran Ali , Rodiah Desty , Solehan
Published: August 2019

The study period pattern of student can facilitate the stakeholders to improve education services in their institutions. This study investigated the study period pattern of the graduated students from January 2014 until February 2018 with the C4.5 algorithm. The obtained data from three academic years 2011, 20112, and 2013 is 140 students with 18 frequently repeated subjects. The total attributes that used in the study are 19 attributes. These attributes contain 18 frequently repeated subject and one attribute for the label is from the study period of a student (punctual or not punctual). This study used the method of K-fold cross-validation with K = 10 and the percentage split with the percentage is 66% to measure the performance of the algorithm C4.5. The results of both methods showed that the subjects that affect sequentially in the study period of the student are a complex function, numerical methods, introduction to computer science, computer programs and basic physics. The accuracy of the results obtained from both the training process K-fold cross-validation amounted to 84.29% and 72.92% for percentage split. It shows that algorithm C4.5 is quite well in predicting the pattern of the study period of a student majoring in mathematics, Department of Universitas Sriwijaya.
Limiting Distribution of the Bootstrap Parameter Estimator of a Second Order Autoregressive Model
Authors: Suprihatin Bambang , Cahyono Endro Setyo , Faruk Alfensi
Published: August 2019

This paper is the extension of our research about asymptotic distribution of the bootstrap parameter estimator for the AR(1) model. We investigate the asymptotic distribution of the bootstrap parameter estimator of a second order autoregressive AR(2) model by applying the delta method. The asymptotic distribution is the crucial property in inference of statistics. We conclude that the bootstrap parameter estimator of the AR(2) model asymptotically converges in distribution to the bivariate normal distribution.
Preparation and characterization of epoxy resin bonded magnet prepared by using jet milled NdFeB
Authors: Eka Sari Meiliyana , Ramlan  , Mulyadi
Published: August 2019

The preparation of bonded magnets is done by mixing the magnetic powder of NdFeB product jet mill with a non-magnetic binder (epoxy resin). Comparison of variation of NdFeB magnetic powder composition with a binder (%wt) 97:3, 95:5, 92:8 of total mass 5 grams. After mixing the powder, then compacted with a hydraulic press, using a 1.8 cm diameter mold with a force of 5 tons, with a compaction time of 5 minutes. The pellet samples were characterized by physical and magnetic properties. Characterization of physical properties includes measurement of density, mechanical properties and corrosion resistance. Characterization of magnetic properties includes measurements of magnetic field strength and magnetic properties characteristics. Measurement of magnetic field strength using Gaussmeter and measurement of characteristic magnetic properties using VSM (Vibrating Sample Magnetometer). The results showed that the optimum physical properties density is the sample with the addition of 3 %wt epoxy resin (density of 5.285 g/cm3) and optimum physical properties compressive strength is the sample with the addition of 8 %wt epoxy resin (compressive strength 10 kgF/cm2) and optimum physical resistance corrosion is the sample with the addition of 3 %wt epoxy resin (with mass change 5,48 gram with time immersion 504 hours). And for the optimum magnetic properties obtained in the test sample with the addition of an epoxy resin binder composition of 3 %wt (magnetic field strength 1029.02 Gauss, remanence 62.21 emu/gram, coercivity 9457 Oe and saturation 101 emu/gram).
Integration of Gas Sensors as an Exhaust Gas Monitoring Device from Green Roasting Process of Various Coffee Beans
Authors: Samsidar  , Sawitri K N , Purbakawaca R , Ridho M , Heriyanti  , Marlinda L , Sutrisno
Published: August 2019

The exhaust gas monitoring system in the coffee roasting process continues to be developed considering the need for more complex roasting coffee beans information. The integrated gas sensor is designed by utilizing a microcontroller controller to see the exhaust gas during the roasting process. The exhaust gas produced during the roasting process is monitored by integrating sensors device to measure exhaust gases (CO, CO2, NOx and SO2). Furthermore, measurements were made by monitoring exhaust gas during roasting of Arabica, Liberica and Robusta coffee beans from Jambi province. The results showed that the total CO concentration in Liberica coffee was 2,121 ppm, Robusta 1,930 ppm and Arabica 1,535 ppm while for CO2 was Liberica 21.3 ppm; Robusta is 22.2 ppm; Arabica is 22.4 ppm, and for NOx is Liberica 303 ppm; Robusta 304 ppm; Arabica is 287 ppm, and the SO2 content for all types of coffee is 0 ppm. The highest exhaust gas concentration occurs after roasting lasts > 20 minutes and at a temperature of 210 - 230°C. It concluded that the integrated gas sensor can be used for the measurement of exhaust gas in the process of coffee beans roasting with the results of measurement of CO exhaust concentration in Liberica coffee is higher than Robusta and Arabica coffee beans.
The effect of drying temperature on chemical composition of chitosan powder from fishbone waste to hydroponic Deep Water Culture (DWC) application
Authors: Ekawati Anita , Arsyad Fitri Suryani , Royani Idha
Published: August 2019

The purpose of this study is to increase the added value of fishery waste, especially cork fish bones that have not been optimally utilized. The benefits of chitosan powder from cork fish bones can be used as a nutrient solution containing calcium in the DWC hydroponic system. The results of this study of cork chitosan bone powder obtained 22.65% Calcium Levels, 2.33% Moisture Content, 0.69% Ash Levels, Protein Levels 92.61%, 140 µm Particle Size, and 93.72% white degrees with microscopic properties obtained density ρ = 0.1 Kg / m3, Porosity P = 61%, Strength of Pressure chitosan powder in water σ = 0.13 Pa, Tensile strength of plant roots σ = 100.63 N / m3 Plant strain of ε = 6.14, and Young’s Modulus E = 16.39 N / m3. The hydrolysis process is carried out to obtain purer calcium chitosan powder with finer size fish so that it is easily absorbed by hydroponic plants.
The effect of atrazine concentration on galvanic cell potential based on molecularly imprinted polymers (MIPS) and aluminium as contact electrode
Authors: Royani Idha , Assaidah  , Widayani  , Abdullah Mikrajuddin , Khairurrijal
Published: August 2019

Potentiometric sensors had been fabricated by employing the Atrazine MIPs as the working electrode; Aluminum (Al) as the electrode potential. A glass with diameter 3 mm and 6 mm as the vessels for chemical solution. The sensor target was a test solution of Atrazine with different concentration. The potential measured between the electrode contact and reference were increase by the rise of Atrazin concentration. The graph of potential cell versus logarithm of concentration revealed two slopes for Al contact. It implied that the potentiometric sensor was sensitive in the range of concentration 0.44-0.55 mM. Reevaluation of the sensor was conducted 3 months later by following the same procedure. Still, the graph showed a consistent curve that prove sensor stability.