bluuebunny/crossref_metadata_2025 huggingface dataset:
Combinatorial approach for screening and assessment of multiple therapeutic enzymes from marine isolatePseudomonas aeruginosaAR01
Authors: Jagadeesan Yogeswaran , Meenakshisundaram Shanmugapriya , Alagar Boopathy Lokha Ranjani , Mookandi Vijay Pradhap Singh , Balaiah Anandaraj
Published: May 2019

A simple and rapid screening of therapeutic enzymes from bacteria was conducted using functional- and sequence-based approach.
UPLC-MS-guided isolation of single ether linkage dimeric 2-(2-phenylethyl)chromones from Aquilaria sinensis
Authors: Kuang Tongdong , Chen Hui-Qin , Wang Hao , Kong Fan-Dong , Cai Cai-Hong , Dong Wen-Hua , Yuan Jing-Zhe , Mei Wen-Li , Dai Hao-Fu
Published: May 2019

Eleven novel uncommon single ether linkage dimeric 2-(2-phenylethyl)chromones (aquilasinenones A–K) were isolated by a UPLC-MS guided method from artificial hole-induced agarwood originating from Aquilaria sinensis.
Limpid hydrogels from β-turn motif-connected tandem repeats of Aβ16–22
Authors: Datta Debika , Kumar Vishnu , Kumar Sachin , Nagaraj Ramakrishnan , Chaudhary Nitin
Published: May 2019

Aβ16–22(Ac-KLVFFAE-am) is non-hydrogelating up to a concentration of 20 mM; two Aβ16–22repeats connectedviaturn-inducing motifs, however, form hydrogels.
Monodisperse micelles composed of poly(ethylene glycol) attached surfactants: platonic nature in a macromolecular aggregate
Authors: Lee Ji Ha , Matsumoto Hayata , Fujii Shota , Takahashi Rintaro , Sakurai Kazuo
Published: May 2019

Among the many studies on micelles, dating back more than 100 years, we first found a series of monodisperse micelles: spherical micelles made from calix[4]arene surfactants exhibited monodispersity in aggregation number (Nagg) with values of 4, 6, 8, 12, and 20.
Metallic cobalt nanoparticles embedded in sulfur and nitrogen co-doped rambutan-like nanocarbons for the oxygen reduction reaction under both acidic and alkaline conditions
Authors: Liu Jinyuan , Xu Li , Deng Yilin , Zhu Xingwang , Deng Jiujun , Lian Jiabiao , Wu Jingjie , Qian Junchao , Xu Hui , Yuan Shouqi , Li Huaming , Ajayan Pulickel M.
Published: May 2019

Designing the porosity of functionalized rambutan-like carbon based materials can shorten the diffusion paths of oxygen to facilitate the oxygen reduction reaction.
Stain-resistant, superomniphobic flexible optical plastics based on nano-enoki mushroom-like structures
Authors: Haghanifar Sajad , Tomasovic Luke M. , Galante Anthony J. , Pekker David , Leu Paul W.
Published: May 2019

In this paper, we demonstrate the stain-resistance and high pressure stability of superomniphobic flexible optical plastics.
Rapid synthesis of size-tunable transition metal carbide nanodots under ambient conditions
Authors: Wan Jun , Huang Liang , Wu Jiabin , Xiong Liukang , Gao Xiang , Hu Zhimi , Jin Hongrun , Zhang Guoqun , Zhou Jun
Published: May 2019

We develop a microwave combustion method for rapid (∼2 min) synthesis of size-tunable transition metal carbide nanodots under ambient conditions.
Fabrication of a highly tough, strong, and stiff carbon nanotube/epoxy conductive composite with an ultralow percolation threshold via self-assembly
Authors: Huang Jinrui , Li Nan , Xiao Laihui , Liu Haiqin , Wang Yigang , Chen Jie , Nie Xiaoan , Zhu Yutian
Published: May 2019

A highly tough, strong, and stiff CNT/epoxy conductive composite with an ultralow percolation threshold was fabricated by constructing cellular structures via self-assembly.
A two-photon fluorophore labeled multi-functional drug carrier for targeting cancer therapy, inflammation restraint and AIE active bioimaging
Authors: Hu Jun , Zhuang Weihua , Ma BoXuan , Su Xin , Yang Li , Li Gaocan , Wang Yunbing
Published: May 2019

Functional drug carriers with simultaneous effective delivery of therapeutic agents to target sites and great imaging ability have attracted great attention in nanomedicine research.
Dysprosium-activated scheelite-type oxides as thermosensitive phosphors
Authors: Perera S. Sameera , Rabuffetti Federico A.
Published: May 2019

A systematic investigation of the thermometric response of dysprosium-activated scheelite-type oxides demonstrates their potential as optical sensors for intermediate temperatures.
Metal halide perovskites for resistive switching memory devices and artificial synapses
Authors: Li Bixin , Hui Wei , Ran Xueqin , Xia Yingdong , Xia Fei , Chao Lingfeng , Chen Yonghua , Huang Wei
Published: May 2019

This article highlights recent developments of emerging metal halide perovskite based resistive switching memory devices and artificial synapses.
Discriminative feature based on FWMW for playback speech detection
Authors: Yang Jichen , Liu Leian , He Qianhua
Published: May 2019

A discriminative feature extraction method for playback speech detection is proposed, it relies on the finding that frame‐wise magnitude‐spectrum weight (FWMW) can enlarge the difference between genuine speech and playback speech. The proposed FWMW is obtained by supplying the sum of every frame magnitude spectrum frequency bin as the weight on the frame magnitude spectrum. Then, a new feature based on FWMW is proposed, namely constant‐Q weight segmentation coefficients (CQWSCs). The experimental result on ASVspoof 2017 version 2.0 evaluation set using CQWSC indicates that: (i) FWMW can make the proposed feature has more discriminative ability and the equal error rate can decline 15.53 and 19.18% under Gaussian mixture model and deep neural network, respectively, and (ii) CQWSC performs better than some commonly used features.
Self‐packaged grounded suspended coplanar waveguide structure
Authors: Xiao Jian‐Kang , Yang Li
Published: May 2019

In this Letter, a novel self‐packaged grounded suspended coplanar waveguide (GSCPW) structure is proposed by using the common multi‐layer PCB techniques, which eliminates the drawbacks of bulky circuit size, heavy weight and difficult to be integrated as that of the traditional suspended circuits with mechanical mounting. Both self‐packaging and end connection are used to reduce the wave leakage, and the multiple via holes are saved, which greatly reduce the simulation time and the fabrication complexity. The proposed GSCPW structure has been fabricated, and has been demonstrated by experimental results with a measured insertion loss of no more than 0.45 dB, and a measured return loss of better than 20 dB from dc to 4 GHz.
Power‐splitting relaying protocol for wireless energy harvesting and information processing in NOMA systems
Authors: Tran Huu Q. , Nguyen Tien‐Tung , Phan Ca V. , Vien Quoc‐Tuan
Published: May 2019

Non‐orthogonal multiple access (NOMA) along with cooperative communications have been recognised as promising candidates for the fifth generation (5G) wireless networks and have attracted many researchers. Every networked device however has its own limited power supply. To this extent, this study investigates a power‐splitting relaying (PSR) protocol for wireless energy harvesting (EH) and information processing in the NOMA systems to prolong the lifetime of the energy constrained relay nodes in wireless networks so as to avail the ambient radio‐frequency (RF) signal as well as to simultaneously harvest the energy and process the information. Decode‐and‐forward relaying is employed at the relay node where the energy from the received RF signal is harvested and exploited to forward the information to the destination. Specifically, the outage probability and ergodic rate of the PSR protocol are derived to realise the impacts of EH time, EH efficiency, power splitting ratio, source data rate, and the distance between nodes. It is shown that an outperformance in terms of the energy efficiency is achieved with an increased EH efficiency and the employment of the NOMA when compared to the conventional orthogonal multiple access.
Efficient decoding approach for NB‐LDPC codes with short blocklength
Authors: Yang Xiao , Jiang Ming , Li Zhengyi , Wang Chen , Zhao Chunming
Published: May 2019

In this study, the authors propose a parallel concatenated decoding (PCD) scheme for short non‐binary low‐density‐parity‐check (NB‐LDPC) codes. It consists of a reduced trellis extended min‐sum (R‐TEMS) algorithm which efficiently reduces the check node updating complexity over high‐order Galois fields and a low complexity ordered statistic decoding aided by partial cyclic redundancy check bits. The R‐TEMS algorithm has a negligible performance loss and noticeable reduction in decoding complexity with respect to the trellis‐based EMS (TEMS) algorithm. Besides, the PCD shows a close error‐correction performance when compared with other concatenated decoding schemes for NB‐LDPC codes. It achieves a coding gain about 0.5 dB with reasonable complexity contrasted with the Q‐ary sum–product algorithm for high‐rate short NB‐LDPC codes over GF(256).
Conditional dual‐connectivity decoupling design framework for OMA and NOMA heterogeneous networks and performance comparison
Authors: Jia Xiangdong , Xu Wenjuan , Fan Qiaoling , Yang Longxiang
Published: May 2019

In order to enhance simultaneously the association robustness of mobile users and spectrum efficiency (SE) of systems, by integrating the decoupled uplink (UL)/downlink (DL) association (DUDA) and cross‐tier dual connectivity (DC), the orthogonal multiple access (OMA)‐mode and non‐OMA (NOMA)‐mode design schemes are investigated over a three‐tier heterogeneous network (HetNet) accompanying with the proposition of a conditional association analysis method. The scheme exploits effectively the DC requirement of NOMA. Additionally, in the proposed conditional association design and analysis method, the decoupling UL association designs are conducted only under a given DL association condition. Owing to low complexity, this method shows that it is very easy to achieve the possible decoupling UL DC designs and the corresponding condition association probabilities. Then, the conditional coverage probabilities and SEs of the OMA‐mode and NOMA‐mode HetNets are derived by specially considering DUDA and coupled UL/DL association strategies. The proposed conditional design framework can be easily extended to multi‐tier HetNets and is helpful to select feasible DL candidate from all possible DL associations so that the resulting UL associations are optimal. Besides this, the cross‐tier DC design ensures the effective exploitation of the whole network resources because different tiers have different serving levels.
Joint relay‐and‐antenna selection for cooperative non‐orthogonal multiple access
Authors: Li Huifang , Li Jing , Lv Lu
Published: May 2019

Non‐orthogonal multiple access (NOMA) has been widely recognised as a promising technology due to its potential to achieve high spectral efficiency and massive connectivity. The authors study a multiple‐relay multiple‐input and multiple‐output cooperative NOMA system. In particular, a joint relay‐and‐antenna selection (JRAS) scheme with coordinated direct and relay transmission is proposed, which makes it possible to maximise the instantaneous rate of far user with high quality ofservice (QoS) priority while guaranteeing the requirement of near user with low QoS priority. Then, closed‐form expressions for outage probability are derived and asymptotic expressions for outage probability in the high signal‐to‐noise ratio regime are also obtained in order to provide further insights. Analysis results demonstrate that the proposed JRAS scheme significantly enhances the outage performance for cooperative NOMA, and simulation results are provided to verify the accuracy of theoretical analysis.
Resilient protection scheme preserving system integrity during stressed condition
Authors: Paladhi Subhadeep , Pradhan Ashok Kumar
Published: May 2019

During stressed system condition, power flow in transmission lines may substantiate and affect seen impedance of distance relay resulting in maloperation. Such a situation may initiate cascaded tripping leading to blackout. Proper coordinated blocking and tripping schemes of distance relays become essential to avoid such a relay malfunction and thus preserving system integrity. In this study, a resilient protection scheme is proposed employing adaptive zone‐1 setting, thereby preventing relay maloperation during stressed system condition. The scheme uses a prefault data of both end distance relays to accomplish the proposed adaptive relay setting for the purpose. The performance of the proposed scheme is tested on the IEEE 118 bus system using PSCAD/EMTDC simulation data and is found to be accurate.
Data‐driven wind speed forecasting using deep feature extraction and LSTM
Authors: Wu Yu‐Xi , Wu Qing‐Biao , Zhu Jia‐Qi
Published: May 2019

Wind speed forecasting is important for high‐efficiency utilisation of wind energy and management of grid‐connected power systems. Due to the noise, instability and irregularity of atmosphere system, the current models based on raw historical data have encountered many problems. In this study, a deep novel feature extraction approach is developed based on stacked denoising autoencoders and batch normalisation. Then the deep features extracted from raw historical data are fed to long short‐term memory (LSTM) neural networks for prediction. Meanwhile, density‐based spatial clustering of applications with noise is employed to process the numerical weather prediction data. By picking out the abnormal samples, the representative training samples are selected to improve the efficiency of the model. For illustration and verification purposes, the proposed model is used to predict the wind speed of Wind Atlas for South Africa (WASA). Empirical results show that deep feature extraction can improve the forecasting accuracy of LSTM 49% than feature selection, indicating that proper feature extraction is crucial to wind speed forecasting. And the proposed model outperforms other benchmark methods at least 17%. Hence, the proposed model is promising for wind speed forecasting.
Circuit topology for piezoelectric transducers in a piezoelectric energy harvester
Authors: Özdemir Ali Ekber
Published: May 2019

In order to maximise the power from a harvester including a great number of piezoelectric transducers (PZTs), the outputs of these transducers should be connected in a suitable way. Since each PZT can be thought of as a non‐ideal source, it is also clear that direct serial connection or parallel connection of these PZTs will not be a very good strategy. In this study, a new circuit topology is proposed for the electric connection between PZTs in a harvester including a great number of PZTs. This proposed circuit topology at the same time presents an efficient rectification and regulation strategy for each PZT used. The process of rectification takes place with minimum voltage loss due to the structure of the proposed circuit topology. In addition, the output of the proposed circuit topology can be used directly to charge an energy storage unit in addition to being connected to the input of any interface circuit. An experimental setup was designed to compare the performance of circuit topology proposed in this study in the form of connection used commonly in the literature. With this experimental setup used, various connection forms and the proposed circuit topology were compared under the same conditions.
Resilience‐directional robust power dispatching of microgrids under meteorological disasters
Authors: Qiu Haifeng , Gu Wei , Wu Zhi , Zhou Suyang , Pan Guangsheng , Yang Xiaomei , Yuan Xiaodong , Ding Xiaohua
Published: May 2019

This study proposes a novel resilience‐directional robust dispatch (RRD) model for an islanded AC/DC hybrid microgrid (HMG). The inherent uncertainties on the source–load power and the occurrence of meteorological disasters are considered in this model. When a meteorological disaster strikes, the wind turbine (WT), photovoltaic (PV), and bidirectional converter of the HMG should be offline to ensure the stability of the HMG and the safety of these sensitive units. When affected by such double uncertainties, the output constraints of the WT, PV and load are bilinear but are linearised via big‐M approach. The proposed RRD model manifests as a min–max–min tri‐layer problem with mixed‐integer recourse variables, which is difficult to solve directly. Therefore, a nested column‐and‐constraint generation algorithm is adopted to convert the tri‐layer problem to a two‐stage mixed‐integer linear programming (MILP) model. The MILP problem is addressed by the commercial solver, thereby obtaining the minimal operating cost and establishing robust scheduling plans with the worst disaster scenario. The effectiveness and rationality of the proposed RRD model and its solution methodology are verified in numerical tests.
Robust measurement validation for radar target tracking using prior information
Authors: Lee Gyuejeong , Kwon Jihoon , Kwak Nojun , Yang Eunjung
Published: May 2019

In this study, the authors propose a robust measurement validation algorithm for radar target tracking in a heavy‐clutter environment. This algorithm defines the prior information with the radar measurement information from the estimated target trajectory. An additional validation gate is set up within the conventional validation gate using the statistics of the prior information then only a part of the validation measurement is selected to update the target state. To verify the effectiveness of the proposed algorithm, the authors designed a simulation for target tracking. The simulation results show that the proposed algorithm has a lower root mean squared position error compared to conventional algorithms in a heavy‐clutter environment.
Energy‐efficient circle zones stable election protocol with helper nodes for heterogeneous WSNs
Authors: Mohamed Fathia A. , Hassan Emad S. , Elsafrawey Amir S. , Dessouky Moawad I.
Published: May 2019

The design of an energy‐efficient routing protocol is crucial for extending the life‐time of limited energy‐constrained wireless sensor networks (WSNs). To achieve this goal, the authors propose three proactive routing protocols; the first protocol is a circle zone stable election protocol (CZSEP). This protocol is a two‐level heterogeneous energy protocol with a circle zone located at the centre of the network field and used to deploy the normal nodes and with advanced nodes that are randomly distributed around the circle zone. The performance of the proposed CZSEP was compared to that of the conventional ZSEP considering the same total initial energy. To further improve the performance of CZSEP, they propose the second protocol named as, CZSEP with helper nodes (CZSEP‐HN) which is a three‐level heterogeneous energy protocol. In CZSEP‐HN, they add helper nodes in certain places in the network field to minimise the energy consumption in the considered network. Both CZSEP and CZSEP‐HN can overcome the problem of large transmission distance between normal nodes and the base station (BS) and between cluster‐heads and BS exists in conventional ZSEP. Finally, they propose the third protocol, which is a modified CZSEP‐HN (MCZSEP‐HN) to overcome the problem of energy consumption in CZSEP‐HN. MCZSEP‐HN is a four‐level heterogeneous energy protocol with two circle zones one for normal nodes and the other for intermediate nodes. The obtained results showed that the MCZSEP‐HN outperforms the other protocols in terms of life‐time, throughput, stability and instability period and can reduce the energy consumption in WSNs.
Distribution of red clump stars does not support the X-shaped Galactic bulge
Authors: López-Corredoira M. , Lee Y.-W. , Garzón F. , Lim D.
Published: May 2019

Context. Claims of an X-shaped Galactic bulge were based on the assumption of red clump stars as standard candles in some lines of sight crossing the off-plane bulge. However, some doubts have been cast on whether the two peaks in star counts along the line of sight really represent a double peak in the density distribution, or whether there is something wrong with the assumption of a unique constant absolute magnitude for all of these stars.

Aims. With the advent of Gaia-DR2 parallaxes in combination with near-infrared VISTA-VVV data, we are able to check which of the hypotheses is correct.

Methods. We calculated the median absolute magnitude MK corresponding to both peaks of putative red clumps in seven lines of sight with the lowest extinction in the interesting coordinates’ range.

Results. The difference between the absolute magnitude of the bright and the faint peak is ΔMK ≈ 0.4. The selected stars in both peaks cannot be represented by the same red clump giants with constant MK ≈ −1.6.

Conclusions. The hypothesis that the bulge contains an X-shape is based on the assumption that the faint and bright peaks of the density distribution towards the bulge are dominated by standard red clump stars. However, we show that both the faint and bright peaks cannot be dominated by standard red clump stars simultaneously.
Bewegung im Kindes- und Jugendalter – zwischen Effekten und Empfehlungen
Authors: Graf Christine , Ferrari Nina
Published: May 2019

Der Nutzen von körperlicher Aktivität bzw. einer Reduktion von vermeidbarer Sitzzeit ist im Kindes- und Jugendalter unbestritten. So ist insbesondere ab dem Grundschulalter belegt, dass ein aktiver Lebensstil mit einer Senkung kardiometabolischer Risikofaktoren, einer Verbesserung der muskuloskeletalen Gesundheit sowie einem Benefit für die kognitive und psychosoziale Entwicklung assoziiert ist. Generell gilt, je mehr Bewegung desto höher der gesundheitliche Nutzen. Ab dem Kindergartenalter sollten mindestens 180, ab Grundschulalter mindestens 90 min Bewegungszeit pro Tag erreicht werden. Vermeidbare Sitzzeiten, insbesondere die Nutzung von Bildschirmmedien, sollen dagegen auf ein Minimum reduziert werden. Allerdings zeigt sich weltweit, auch in Deutschland, ein zunehmender Rückgang der Bewegungszeit und eine Zunahme des Konsums audiovisueller Medien. Damit verbunden ist eine Verschlechterung der körperlichen Leistungsfähigkeit. Dies wiederum korreliert invers mit ausgewählten gesundheitlichen Parametern wie beispielsweise dem Body-Mass-Index (BMI), Blutdruck und/oder Lipiden. Bislang gibt es keinen Goldstandard wie dieser Negativspirale begegnet werden kann. Verhältnispräventive Ansätze gelten aktuell am erfolgversprechendsten, brauchen aber für eine konsequente Umsetzung den entsprechenden politischen Willen.
Elbow Dislocation with Ipsilateral Radial Shaft Fracture – A Case Report
Authors: Aita Marcio Aurelio , Oliveira Ricardo Kaempf de , Praetzel Rafael Pêgas , Towata Fernando , Delgado Pedro Jose , Marques Fabiano da Silva
Published: May 2019

Background Posterior dislocation of the elbow associated to a radial shaft fracture is a rare lesion, its treatment is difficult and complicated, and the indications, surgical options, and timing of surgery may vary. In the present case, we performed immediately after the trauma (urgent care) an open reduction internal fixation (ORIF) surgery of the radial fracture by means of a 3.5 mm locking plate, associated to closed elbow reduction and stabilization with dynamic bracing.

Case Report A 26-year-old woman was seen in our service with a traumatic deformity of her right, dominant forearm and elbow after a fall from a balance board and presented with a radial shaft fracture and posterior elbow dislocation. The palmar approach was used and the shaft fracture was fixated. During the radial fracture reduction maneuver, the dislocation of the elbow was spontaneously reduced. At 1 year postoperatively, the patient showed good wrist, forearm, and elbow range of motion (ROM). Disabilities of the arm, shoulder and hand (DASH) score of 5, visual analogue scale (VAS) of 0, and grip strength of 92%, as compared with the nonaffected side.

Clinical Relevance Nowadays, case reports of concomitant, ipsilateral multiple injuries that uncommonly occur together in a single traumatic episode are very rare. The awareness of this association for early recognition is of paramount significance for ideal clinical results.
Triggers for cooperative behavior in the thermodynamic limit: A case study in Public goods game
Authors: Benjamin Colin , Sarkar Shubhayan
Published: May 2019

In this work, we aim to answer the question: what triggers cooperative behavior in the thermodynamic limit by taking recourse to the Public goods game. Using the idea of mapping the 1D Ising model Hamiltonian with nearest neighbor coupling to payoffs in game theory, we calculate the Magnetization of the game in the thermodynamic limit. We see a phase transition in the thermodynamic limit of the two player Public goods game. We observe that punishment acts as an external field for the two player Public goods game triggering cooperation or provide strategy, while cost can be a trigger for suppressing cooperation or free riding. Finally, reward also acts as a trigger for providing, while the role of inverse temperature (fluctuations in choices) is to introduce randomness in strategic choices.
Enhanced n-type β-Ga2O3 (2¯01) gate stack performance using Al2O3/SiO2 bi-layer dielectric
Authors: Biswas Dipankar , Joishi Chandan , Biswas Jayeeta , Thakar Kartikey , Rajan Siddharth , Lodha Saurabh
Published: May 2019

High performance gate stacks are critically needed for the development of β-Ga2O3 power transistors. Significant improvement in the performance of β-Ga2O3 gate stacks is demonstrated in this work by using SiO2 as an interlayer dielectric between Al2O3 and β-Ga2O3. The presence of SiO2 results in an 800× reduction in gate leakage current along with a 1.7× increase in the electric breakdown field. Additionally, the capacitance-voltage characteristics show an increase in flat band voltage (from 0.74 V to 3.25 V) that can enable normally off power transistors. The lowest interface trap density (Dit) of 5.1 × 1010 cm−2 eV−1 for the SiO2/β-Ga2O3 interface has been demonstrated through the use of a piranha clean before SiO2 deposition on β-Ga2O3 for the first time. Reduction (8×) in Dit, hysteresis (from 0.17 V to 0.05 V), and border trap density indicate substantial improvement in the quality of the β-Ga2O3/gate dielectric interface for the Al2O3/SiO2 bilayer stack as compared to only Al2O3.
Correlating the lattice parameter and Curie temperature of γ-Ni in Fe-Ni-base alloys
Authors: Anand K. S. , Goswami D. , Jana P. P. , Das J.
Published: May 2019

We report a correlation between the Curie temperature (TC) and lattice parameter (a) of γ-Ni phase in Fe-Ni-base alloys. The Bethe-Slater curve represents the dependence of exchange integral (J) on the ratio of the interatomic spacing (D) to the diameter of 3d orbital (d) of an element. According to the mean field model, the exchange integral J is directly proportional to the TC. A large number of Fe-Ni base alloys were surveyed to establish a mathematical relationship between TC and D/d, as well as to predict the TC of FCC γ-Ni phase by estimating its lattice parameter.
Diversity and relationships of Ampedini Gistel, 1848 (Coleoptera : Elateridae) in Switzerland and Europe
Authors: Vuataz Laurent , Sanchez Andreas , Wyler Sofia , Blanc Mickaël , Chittaro Yannick
Published: May 2019

The click-beetle family Elateridae is an abundant and ecologically important component of the saproxylic fauna, and many species are used as key indicators of old-growth forests, a rare and endangered habitat in Europe. Among Elateridae, the tribe Ampedini includes several species with unclear taxonomic status. Here we examined the species status and the relationships between 26 of the 29 Ampedini species recorded in Switzerland using both mitochondrial (CO1) and nuclear (ITS2) markers, and compared our results with the CO1 data publicly available for Europe. Our tree-based species-delimitation analysis was largely congruent with traditional, morphology-based species, with the ITS2 and the combined (CO1+ITS2) datasets corresponding more precisely to morphology than the CO1 dataset. As expected, species with unclear or debated taxonomic status generally corresponded to closely related DNA-based species pairs. Our results support the taxonomic status of some of these ambiguous species, while others require further investigations, including a more exhaustive sampling and new morphological examinations. The Ampedini species tree provided here, which is the first attempt of a DNA-based Ampedini phylogeny, did not support the genera Brachygonus and Ampedus as monophyletic, but further investigations are necessary to confirm this result.
Rediscovered or reconsidered: the presumed extinct ferns and lycophytes of tropical Queensland, Australia
Authors: Field Ashley Raymond , Renner Matt A. M.
Published: May 2019

The veracity of records of the 11 presumed Extinct or missing ferns and lycophytes from the Wet Tropics Bioregion of northern Queensland is investigated by examination of original materials and by intensive field searches of their recording sites. Two of the species, namely Hymenophyllum whitei and Oreogrammitis leonardii, were rediscovered. One of the species, Lastreopsis dissecta, is taxonomically problematic. Another taxon, Lindsaea pulchella var. blanda, is excluded as an erroneous record. The remaining seven species, namely Didymoglossum exiguum, Haplopteris dareicarpa, Huperzia serrata, Hymenophyllum lobbii, Lemmaphyllum accedens, Pseudodiphasium volubile and Tmesipteris lanceolata, all having been recorded by Karel Domin, appear to be questionable records and their presence in Australia requires ongoing consideration unless they are relocated or can be otherwise excluded.
A neural network protocol for electronic excitations of
N
-methylacetamide
Authors: Ye Sheng , Hu Wei , Li Xin , Zhang Jinxiao , Zhong Kai , Zhang Guozhen , Luo Yi , Mukamel Shaul , Jiang Jun
Published: May 2019

Significance

UV absorption spectroscopy is an effective technique for characterizing protein structure. However its theoretical interpretation requires expensive first-principles simulations. We employ a neural network strategy to predict UV electronic spectra of peptide bonds. The protocol establishes structure–property relations and predicts ground-state dipole moments, as well as transition dipole moments. We establish machine learning as a useful spectroscopy simulation tool.
Segregation through the multiscalar lens
Authors: Olteanu Madalina , Randon-Furling Julien , Clark William A. V.
Published: May 2019

Significance

We develop a method of measuring segregation which captures the multidimensional nature of mixing in metropolitan areas. The use of trajectory convergence analysis provides a flexible way for capturing change across all scales from small spatial units and how the rate of convergence to the citywide average modifies over space. Thus, the method provides an analysis of how far, in spatial terms, any individual or neighborhood is from the citywide multigroup distribution. We use this method to investigate ethnic mixing in the Southern California metropolitan region. The results illustrate excellent visual measures of the patterns of mixing across urban space, and the graphical trajectories reveal the spatial speed at which the process of convergence takes place.
Health and safety considerations.
Authors: Widodo P. , Nur F. , Nafisah E. , Forster B. P. , Hasibuan H. A.
Published: May 2019

Bunch and oil analysis involves activities in the field and the laboratory. All field and laboratory operations should adhere to standard health and safety protocols. These may vary according to local requirements and standards. Some equipment will also come with instructions on proper use, which may involve training, including health and safety issues. Failure to abide by these can result in accidents and personal injury (serious and minor); neglect of health and safety issues may also incur penalties such as fines or cessation of field and laboratory activities. Guidelines in health and safety issues relating to bunch sampling in oil palm are given below.
Oil analysis.
Authors: Widodo P. , Nur F. , Nafisah E. , Forster B. P. , Hasibuan H. A.
Published: May 2019

Oil analysis of the mesocarp is determined by extracting the oil from dried mesocarp samples. Before the extraction step is conducted, the wet (fresh) mesocarp sample needs to be dried. Conventional drying of wet mesocarp is done in an oven. Oil is removed by refluxing with n-hexane in a soxhlet apparatus. Once oil extraction is completed, oil yield can be calculated by the difference of mesocarp weight before and after extraction. Oil analysis will obtain the percentage of dry mesocarp to fruit (DM/F); dry mesocarp to wet mesocarp (DM/WM); percentage of oil in dry mesocarp (O/DM); percentage of oil in wet mesocarp (O/WM); and percentage of mesocarp oil in the bunch (O/B).
Lets go surfing now, everybody's learning how; attentional strategies on expert and novice surfing performance under both practice and competition conditions
Authors: Lawrence Gavin P. , Virian Jana , Oliver Samuel J. , Gottwald Victoria M.
Published: May 2019

Research suggests an external focus of attention (EFOA) promotes effective performance and learning compared to an internal focus of attention (IFOA), with explanations proposed by the constrained action hypothesis (CAH) and OPTIMAL theory of motor learning. Specifically, it is proposed that adopting an EFOA prevents the constraining of normally automatic control processes and subsequent performance decrements (typically observed when individuals adopt an IFOA) by simultaneously reducing self‐focus strategies and enhancing goal‐action coupling. The present study attempted to fill this research lacuna by examining the CAH and OPTIMAL theory in a complex, ecologically valid, motor task under both low and high‐pressured conditions. In two separate experiments, novice (n = 23) and advanced (n = 21) surfers completed a surfing task in an artificial Wavegarden under either EFOA or IFOA instructions. Experimental phases included a pre‐test, acquisition and competition transfer. Results revealed that advanced and novice surfing performance benefited from adopting an EFOA in both normal and competitive situations. These findings are discussed in terms of the theoretical implications for the CAH and OPTIMAL theory, in addition to the anxiety literature. Reference to applied implications when instructing and performing within ecologically valid surfing settings are also presented.
Final report of CCQM-K153 Measurement of Specific Adsorption A [mol/kg] of N2 and Kr on nonporous SiO2 at LN temperature (to enable a traceable determination of the Specific Surface Area (BET) following ISO 9277)
Authors: Sobina Egor , Zimathies, Annett , Prinz Carsten , Emmerling Franziska , Kurokawa Akira , Mizuno Kohei , Sadak Ali Enis , Karakus Erman , Wang Hai , Unger Wolfgang
Published: May 2019

CCQM key comparison K-153 Measurement of Specific Adsorption A [mol/kg] of N2 and Kr on nonporous SiO2 at LN temperature (to enable a traceable determination of the Specific Surface Area (BET) following ISO 9277) has been performed by the Surface Analysis Working Group (SAWG) of the Consultative Committee for Amount of Substance (CCQM). The objective of this key comparison is to compare the equivalency of the National Metrology Institutes (NMIs) and Designated Institutes (DIs) for the measurement of specific adsorption, BET specific surface area) of nonporous substances (sorbents, ceramics, catalytic agents, etc) used in advanced technology.

In this key comparison, a commercial nonporous silicon dioxide was supplied as a sample. Eight NMIs participated in this key comparison, but only five NMI's have reported in time. All participants used a gas adsorption method, here nitrogen and (or) krypton adsorption at 77.3 K, for analysis according to the international standards ISO 15901-2 and 9277.

In this key comparison, the degrees of equivalence uncertainties for specific adsorption nitrogen and krypton, BET specific surface area were established.

KEY WORDS FOR SEARCH

nonporous SiO2, Specific Adsorption of N2 and Kr, BET specific surface area

Main text

To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/.

The final report has been peer-reviewed and approved for publication by the CCQM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).
Contactless Microwave Detection of Shubnikov–De Haas Oscillations in Three-Dimensional Dirac Semimetal ZrTe5*
Authors: Wu Min , Zhang Hongwei , Zhu Xiangde , Lu Jianwei , Zheng Guolin , Gao Wenshuai , Han Yuyan , Zhou Jianhui , Ning Wei , Tian Mingliang
Published: May 2019

We report Shubnikov–de Haas (SdH) oscillations of a three-dimensional (3D) Dirac semimetal candidate of layered material ZrTe5 single crystals through contactless electron spin resonance (ESR) measurements with the magnetic field up to 1.4 T. The ESR signals manifest remarkably anisotropic characteristics with respect to the direction of the magnetic field, indicating an anisotropic Fermi surface in ZrTe5. Further experiments demonstrate that the ZrTe5 single crystals have the signature of massless Dirac fermions with nontrivial π Berry phase, key evidence for 3D Dirac/Weyl fermions. Moreover, the onset of quantum oscillation of our ZrTe5 crystals revealed by the ESR can be derived down to 0.2 T, much smaller than the onset of SdH oscillation determined by conventional magnetoresistance measurements. Therefore, ESR measurement is a powerful tool to study the topologically nontrivial electronic structure in Dirac/Weyl semimetals and other topological materials with low bulk carrier density.
Anisotropy Engineering Edge Magnetism in Zigzag Honeycomb Nanoribbons*
Authors: Li Baoyue , Cao Yifeng , Xu Lin , Yang Guang , Ma Zhi , Ye Miao , Ma Tianxing
Published: May 2019

It has been demonstrated that the zigzag honeycomb nanoribbons exhibit an intriguing edge magnetism. Here the effect of the anisotropy on the edge magnetism in zigzag honeycomb nanoribbons is investigated using two kinds of large-scale quantum Monte Carlo simulations. The anisotropy in zigzag honeycomb nanoribbons is characterized by the ratios of nearest-neighbor hopping integrals t1 in one direction and t2 in another direction. Considering the electron-electron correlation, it is shown that the edge ferromagnetism could be enhanced greatly as t2/|t1| increases from 1 to 3, which not only presents an avenue for the control of this magnetism but is also useful for exploring further novel magnetism in new nano-scale materials.
Magnetization Reversal in Magnetic Bilayer Systems*
Authors: Jin Li-Peng , Liu Yong-Jun
Published: May 2019

Magnetization reversal in magnetic soft/hard bilayer systems is studied analytically by means of a variational method for magnetic energies in a continuum model. The demagnetization curve is involved with nonlinear equations, and the solution is given implicitly in the form of Jacobi functions, which is valid for the total reversal process. Based on the non-trivial solutions, hysteresis loops, as well as the maximum energy product (BH)max versus thicknesses of soft/hard layers are obtained. With regard to (BH)max, improvement of the remanence competes with loss of coercive force. As a result, an optimum condition exists. For a given thickness of the hard layer, the optimum condition at which the largest (BH)max could be achieved is discussed, which is slightly different from previous works.
A high-performance 4 nV (√Hz)−1 analog front-end architecture for artefact suppression in local field potential recordings during deep brain stimulation
Authors: Petkos Konstantinos , Guiho Thomas , Degenaar Patrick , Jackson Andrew , Brown Peter , Denison Timothy , Drakakis Emmanuel M
Published: May 2019

Objective. Recording of local field potentials (LFPs) during deep brain stimulation (DBS) is necessary to investigate the instantaneous brain response to stimulation, minimize time delays for closed-loop neurostimulation and maximise the available neural data. To our knowledge, existing recording systems lack the ability to provide artefact-free high-frequency (>100 Hz) LFP recordings during DBS in real time primarily because of the contamination of the neural signals of interest by the stimulation artefacts. Approach. To solve this problem, we designed and developed a novel, low-noise and versatile analog front-end (AFE) that uses a high-order (8th) analog Chebyshev notch filter to suppress the artefacts originating from the stimulation frequency. After defining the system requirements for concurrent LFP recording and DBS artefact suppression, we assessed the performance of the realised AFE by conducting both in vitro and in vivo experiments using unipolar and bipolar DBS (monophasic pulses, amplitude ranging from 3 to 6 V peak-to-peak, frequency 140 Hz and pulse width 100 µs). A full performance comparison between the proposed AFE and an identical AFE, equipped with an 8th order analog Bessel notch filter, was also conducted. Main results. A high-performance, 4 nV (

)−1 AFE that is capable of recording nV-scale signals was designed in accordance with the imposed specifications. Under both in vitro and in vivo experimental conditions, the proposed AFE provided real-time, low-noise and artefact-free LFP recordings (in the frequency range 0.5–250 Hz) during stimulation. Its sensing and stimulation artefact suppression capabilities outperformed the capabilities of the AFE equipped with the Bessel notch filter. Significance. The designed AFE can precisely record LFP signals, in and without the presence of either unipolar or bipolar DBS, which renders it as a functional and practical AFE architecture to be utilised in a wide range of applications and environments. This work paves the way for the development of externalized research tools for closed-loop neuromodulation that use low- and higher-frequency LFPs as control signals.
Numerical solutions to a class of scalar elliptic BVPs for anisotropic exponentially graded media
Authors: Azis M. I.
Published: May 2019

The Boundary Element Method (BEM) is used for obtaining solutions to another class of elliptic boundary value problems (BVPs) of anisotropic exponentially graded media. A technique of transforming the variable coefficient governing equation to a constant coefficient equation is utilized for deriving a boundary integral equation. Some particular problems are considered to illustrate the application of the BEM. The results show the convergence, consistency, and accuracy of the BEM solutions.
Application of tabu search method in solving a taxi-sharing problem
Authors: Hadiarti R N , Satria Y , Burhan H
Published: May 2019

Nowadays, a ride-sharing system is a trend among society for traveling. The ride-sharing system is a solution that can be developed to reduce the congestion because of the high amounts of the vehicle on the road. Taxi as an alternative transportation in an urban area can impose the ride-sharing system. Taxi-sharing aims to maximize the utilization of taxi capacity, thereby reduces the fare for passengers, increases the income for taxi operator, and reduces congestion, gas emission, as well as fuel consumption. In order to maximize the benefits of the taxi-sharing system usage, we need to optimize taxi routes and match requests that share taxi service. In this paper, we used a mixed integer programming problem as in Hosni et al (2014) to make a model of optimization of the taxi-sharing problem, then solved the problem by using a tabu search method. The experiments showed that the tabu search method could increase the income of taxi operator up to 10 - 14 %.
Application of parallel tabu search in solving Ride-sharing problem with HOV Lanes
Authors: Hanifa Y L , Satria Y , Burhan H
Published: May 2019

Ride-sharing can be defined as a system where travelers can share their vehicles and travel cost with others who have a similar destination and time schedule. Ride-sharing problem with High Occupancy Vehicle (HOV) Lanes is a problem of finding an optimal route to serve costumer demand where each demand and vehicle consists of origin and destination point, and some of the route are restricted-use freeways lanes reserved for vehicles with more than a predetermined number of occupants, which called HOV lanes. With the use of ride-sharing and HOV Lanes, it is expected to reduce the number of the vehicles thus will mitigate the congestion. The optimal solution is the one with minimum number of total distance, passenger’s ride time, and cost. This study discusses the application of insertion heuristic and parallel tabu search to optimize the use of Ride-sharing with HOV Lanes. Insertion heuristic is applied to obtain an initial solution and parallel tabu search algorithm is applied to improve the initial solution and obtain a better solution. For the case of eight vehicles and eight requests, from insertion heuristic we obtained an initial solution with an objective function value of 425 and with the used of parallel tabu search method we obtained a better solution with an objective function value of 420.
Effects of femoral head diameter on the predicted acetabular cup wear volume of CP-Ti and UHMWPE hip implants
Authors: Handoko  , Suyitno  , Dharmastiti Rini , Magetsari Rahadyan
Published: May 2019

Numerical investigation is a method capable to study the expensive and long-time duration wear problems in biotribology. The technique has been used to predict the wear of hip implants specially those made from metal on polymer biomaterials. This research studied the effect of commercially pure titanium (CP-Ti) femoral head diameter on the wear volume of ultra-high molecular weight polyethylene (UHMWPE) acetabular cup. Diameter variations are 22 mm, 28 mm and 32 mm. Hip implant models were created and the numerical approximations conducted with the finite element method. Wear calculations used a nonlinear load and contact area mathematical model. A Python script was developed to proceed the calculations. Accurate wear predictions can be obtained with the use of fine elements those maximum contact loads are closer to the physiological load. Verification with experimental data on the 32 mm femoral head model shows a good agreement with error rates below 1%.
Verified numerical computations for dense linear systems in supercomputing
Authors: Ozaki Katsuhisa
Published: May 2019

The numerical computations with guaranteed accuracy called verified numerical computations are studied, herein. We focus on an accurate numerical solution for dense linear systems of the form Ax = b and error bound of

‖

x
^

−
x

‖

∞

in supercomputing, where

x
^

is an approximate solution. First, we implemented accurate algorithms for a matrix-vector product for parallel and distributed computing, and then, applied them to iterative refinements. Next, we implemented verified numerical computations using the Parallel Basic Linear Algebra Subprograms (PBLAS) and the Scalable Linear Algebra Package library (ScaLAPACK). Numerical examples of the verified numerical computations for linear systems are presented using the Fujitsu FX100 supercomputer. They clearly illustrate the efficiency of the verified numerical computations.
Comparison of the Bayesian and Maximum Likelihood Estimation of Rayleigh Distribution for Right Censored Survival Data Type II
Authors: Rahajeng Ika D. P , Fithriani Ida , Nurrohmah Siti
Published: May 2019

In this paper, we used maximum likelihood and Bayes method to estimate parameter of Rayleigh distribution for right censored survival data type II to know the best method. The prior knowledge which used in Bayes method is Invers Gamma prior. Maximum likelihood and Bayes method under Square Error Loss Function will be compared. We compare these methods by Mean Squared Error (MSE) value using R program. After that, the result will be displayed in tables to facilitate the comparisons.