bluuebunny/crossref_metadata_2025 huggingface dataset:
Multi-channel wireless A/D acquisition system based on NRF24L01 and LABVIEW
Authors: Gong Yang , Zhang Pan
Published: March 2020

This paper presents a wireless A/D acquisition system based on NRF24L01 and LABVIEW, which can be used to collect A/D data in the harsh environment of industrial production, but the staff can not easily approach or can not persist in the field for a long time. The system mainly by the wireless transmission module NRF24L01 and A/D data acquisition module, which A/D conversion part of the chip using STM32C8T6 own ADC. The computer uses LABVIEW as the host computer for data display and processing. The wireless A/D acquisition system has stable operation, long transmission distance, accurate data transmission, no loss of data, and can be adapted to various industrial control and measurement situations through measurement in different harsh environments of the factory.
Application of communication systems via the ultraviolet channel in FANET networks
Authors: Vasilyev Gleb S. , Kuzichkin Oleg R. , Surzhik Dmitriy I. , Kharchuk vetlana M.
Published: March 2020

The possibility of providing communication in difficult conditions on the basis of Flying Ad Hoc Networks (FANET) requires the use of non-electronic means of communication. It is proposed to use optical communication in the UV-C range in the absence of line-of-sight between the nodes of the FANET network. The general scheme of the optical transmitter and receiver of UV-C range is considered and the review of the components required for its implementation, taking into account the application possibility in highly mobile small-sized UAVs, is carried out. As a result of the analysis of FANET networks with UV-C channel, physical and channel level parameters critical for network performance are revealed. Methods of adaptive change of these parameters in the practical implementation of the UV-C communication system in FANET networks are proposed.
The advancement of cluster based FPGA place & route technic
Authors: Zhou Zhimei , Wan Yong , Liu Yin , Guo Xiaoyan , Yin Qilin , Feng Chen
Published: March 2020

As one of the core components of electronic hardware systems, Field Programmable Logic Array (FPGA) device design technology continues to advance under the guidance of electronic information technology policies, and has made information technology applications. huge contribution. However, with the advancement of chip technology and the continuous upgrading of information technology, the functions that FPGAs need to perform are more and more complicated. How to efficiently perform layout design and make full use of chip resources has become an important technology to be solved and optimized in FPGA design. The FPGA itself is not limited to a specific function. It contains internal functions such as memory, protocol module, clock module, high-speed interface module and digital signal processing. It can be programmed through logic modules such as programmable logic unit modules and interconnects. Blank FPGA devices are designed to be high performance system applications with complex functions. The layout and routing technology based on cluster logic unit blocks can combine the above resources to give full play to its performance advantages, and its importance is self-evident. Based on the traditional FPGA implementation, this paper analyzes several advantages based on cluster logic block layout and routing technology, and generalizes the design method and flow based on cluster logic block layout and routing technology.
The evolutionary dynamics of group-level terrorist network
Authors: Li Zhanfeng , Li Bo , Sun Duoyong
Published: March 2020

In the age of globalization and information, terrorist groups cooperate and interact with each other frequently and have formed a complex and dynamic system. For the purpose to explore the evolutionary dynamics of transnational terrorism, the paper mapped location-based networks to model the terrorism system, followed with preference attachment model to discover laws that how terrorism developed. The work gave an outline about how terrorist groups evolved and explained how terrorism would develop and expand. The findings would supply significant suggestion to counterterrorism organizations.
Overview on MTD technology based on game theory
Authors: Sun Yan , Ji Weifeng , Weng Jiang , Zhao Beiying
Published: March 2020

Mobile target defense (MTD) is a research hotspot in the field of network security. The decision method of network defense based on game theory is an important technique to guide MTD to make the optimal defense behavior in different network environments (GT-MTD). A lot of related work has been put forward in this field. In this paper, we focus on the scope and field of GT-MTD, systematically introduce the application scenarios of MTD in combination with four different game theory models of classical games (static games, signal games), Markov games, differential games or evolutionary games, and put forward the future development direction. There are some new views and explanations on the research of GT-MTD.
Research on cloud manufacturing platform for small and medium-sized enterprises
Authors: Ke Shujie , Chen Shengkai , Liu Mengnan , Xu Cunzhi , Bai Jie , Fang Shuiliang
Published: March 2020

With the adjustment of China’s economic structure, it is essential for manufacturing enterprises, especially SMEs, to improve their core competitiveness. Based on the service mode of Cloud manufacturing, this paper designs and develops a cloud manufacturing platform for SMEs. Firstly, according to the characteristics of cloud manufacturing, the overall framework of the platform is determined, and the corresponding function tree is refined. Then, the key technologies are studied, including the modeling and standardization of manufacturing services, the matching of task, the execution, the online monitoring of service, and the evaluation of post-service. The functions of service access, service matching, outsourcing task management, remote monitoring, and evaluation of tasks are realized. Finally, the platform is applied in the mold manufacturing industry, and an example analysis is carried out to verify the effectiveness of the proposed platform.
Retracted article: Analysis of extreme programming
Authors: Feng Ya , Cui Dongliang , Li Hui , Zhao Ying , Liu Jia
Published: March 2020

We take a zero tolerance to any situation where fraudulent research is published in our journals. As a result, this article has been retracted by the Publisher because it is suspected to be a nonsensical publication computer-generated by the program SCIgen.
An efficient fuzzy optimization algorithm based on convolutional neural network
Authors: Wang Gaihua , Liu Wenzhou , Nie Mengqi , Li Tao
Published: March 2020

The paper proposes a method based on dense-sparse-dense optimization algorithm. It uses sparsity to tune network weights. By adding fuzzy membership, the optimization strategy can enhance the feature information with larger weights and weaken the feature information with less weight. Through accurate cutting of network weights, parameters in network are effectively reduced. The experimental results show that the performance of this method is better than the existing method.
DSSMFM: Combining user and item feature interactions for recommendation systems
Authors: Zeng Weishan
Published: March 2020

Effort has been done to optimize machine learning algorithms by applying relevant knowledges in data fields in recommendation systems. Ways are explored to discover the relationship of features independently, making the model more effective and robust. A new model, DSSMFM is proposed in this paper which combines user and item features interactions to improve the performance of recommendation systems. In this model, data are divided into user features and item features represented by one-hot vectors. The pre-training for the model is proceeded through FM, and implicit vectors are obtained for both user and item features. The implicit vectors are used as the input of DSSM, and the training of the DSSM part of the model will maximize the cosine distances of the user attributes vectors and the item attributes vectors. According to the experimental results on dataset of ICME 2019 Short Video Understanding and Recommendation Challenge, the model shows improvements on some results of the baselines.
Color image encryption via compressive sensing and chaotic systems
Authors: Zhu Kaige , Cheng Jinli
Published: March 2020

In this paper, we design a color image encryption algorithm based on chaotic system and block compressive sensing. Firstly, the sparse representation of the plain-image is obtained by an adaptive learning dictionary. Secondly, the key streams are produced from two excellent low-dimensional chaotic maps, where updating the initial values and parameters rely on the SHA-384 and the input image. Thirdly, three measurement matrices of R, G, B components are constructed from the chaotic sequences, respectively. Finally, a random rows and columns diffusion method is performed on the encrypted image. Experimental results and safety analysis prove that the proposed scheme has excellent performance.
Robot arm control method using forearm EMG signals
Authors: Chen Minjie , Liu Honghai
Published: March 2020

With the continuous improvement of control technology and the continuous improvement of people’s living standards, the needs of disabled people for high-quality prosthetics have become increasingly strong. A control method of robotic arm based on surface electromyography signal (sEMG) of forearm is proposed. Firstly, the 16-channel EMG data of the forearm is obtained via the multi-channel EMG acquisition instrument and the electrode cuff as input signals, the features are extracted, then the gestures are classified and identified by the support-vector machine (SVM) algorithm, and the signals are finally transmitted to the robotic arm, so that people can teleoperate the robotic arm via sEMG signals in real time. Reduce the number of channels to lower the cost while ensuring a high and usable recognition rate. Experiments were performed by collecting EMG signals from the forearm surface of eight healthy volunteers. The experimental results show that the system’s overall gesture recognition accuracy rate can reach up to 90%, and the system responds fast, laying a good foundation for manipulating artificial limbs in the future.
Research on thrust vector control of nonlinear solid rocket motor nozzle based on active disturbance rejection technology
Authors: Shi Chenhong , Yang Jinpeng , Xu Zhishu
Published: March 2020

In this paper, based on the auto disturbance rejection control technology, the electromechanical servo system is used as the control actuator, and the thrust vector control of the solid rocket motor nozzle with typical nonlinear friction characteristics is studied and analyzed. In this paper, the realization of the classical PID algorithm and the lack of dynamic performance are analyzed, and then the compensation algorithm based on the auto disturbance rejection control technology is added. The algorithm compensates for the phase lag of the system due to the nonlinear friction characteristics. As a result, the frequency characteristics of the system have been significantly improved.
Design of a new type of safety protection device for gas bottle cabinet
Authors: Guo Lianghui , Jia Wenting
Published: March 2020

Aiming at the problem of explosion caused by leakage of flammable and explosive gas cylinder, a new type of safety protection device for gas bottle cabinet is designed to solve this problem. The design of this new type of gas bottle cabinet safety protection device is to use GSM voice, short message control technology, sensor technology, wifi technology, plc control technology and so on, to monitor the gas in the gas bottle cabinet in real time. Once the gas in the cylinder leaks and the concentration of the leakage gas reaches the set alarm concentration, the alarm will occur, and the exhaust fan will start to discharge the leakage gas and send an alarm message to the pre-set mobile phone at the same time.
Feature selected cost-sensitive twin SVM for imbalanced data
Authors: Li Xiaopeng , Zhang Xianrong
Published: March 2020

In this paper, we propose a cost-sensitive twin SVM (cs-tsvm) and apply it to imbalanced data. A weight is added to each instance according to its cost of misclassification which is related to its position. In preprocessing part, features are selected by their difference of majority and minority classes. The feature is selected when its difference value is higher than average one. The experiment is conducted on UCI datasets and G-mean, AUC and accuracy are evaluation metrics. The experimental results show that Feature selection with CS-TWSVM is useful for datasets with high dimension.
A mode of training computer education talents based on the requirements of “both red and expert”--taking Sichuan agricultural university as an example
Authors: Mao Ping , Zhang Xi
Published: March 2020

“Both red and expert”, is comrade Xi Jinping’s expectation of contemporary youth and the fundamental pursuit of socialist education. In the practice of running a school, Sichuan Agricultural University always adheres to the principle of “both red and expert” and “comprehensive development”. To cope with the challenge of informationization to computer education talents, Sichuan Agricultural University has effectively explored a computer education talent training mode characterized by “excellent political quality, solid basic theory of specialty, strong practical ability”, which will be beneficial to the cultivation of the high-quality computer science talents in China of new period.
Einfluss oraler Kollagen-Peptide auf die Hautqualität am ganzen Körper
Authors: Streker M. , Thill M. S. , Kerscher M.
Published: March 2020

Die Hautalterung ist ein komplexer Prozess, der sowohl extrinsischen als auch intrinsischen Einflüssen unterliegt. Neben sichtbaren Zeichen wie Falten und einem Verlust an Elastizität spielen sich insbesondere in der Dermis molekulare Veränderungen ab. Ein wesentlicher Faktor ist die Minderung der Qualität und Quantität von kollagenen Fasern sowie weiteren extrazellulären Matrixbestandteilen. Bereits in früheren In-vivo-Human-Studien wurde eine Verbesserung der Hautqualität im Gesicht durch die orale Supplementierung mit Kollagenpeptiden nachgewiesen. Es konnte mittels objektiver, validierter dermatologischer Messmethoden bestätigt werden, dass die orale Aufnahme von speziellen Kollagen-Peptiden über einen längeren Zeitraum die Hautphysiologie (Lipidgehalt der Hautoberfläche, Stratum-corneum-Hydratation, Hautelastizität, Hautglätte und Hautdichte) positiv beeinflusst. In der vorliegenden 12-wöchigen Studie wurden die positiven Effekte eines Nutraceuticals mit bioaktiven Kollagen-Peptiden (ELASTEN®) auf die Hautqualität erstmals am gesamten Körper (Gesicht, Dekolleté, Arm und Oberschenkel) untersucht.
Von der Steintherapie zum Aneurysmacoiling
Authors: Enge Michael , Albarghouth Mohamad Hatem , Behrendt Wolf , Hamza Amir
Published: March 2020

Im Nachfolgenden wird der Fall einer 54-jährigen Patientin dargestellt, welche 3 Wochen nach perkutaner Nephrolithotomie persistierende Makrohämaturie mit Harnblasentamponadenbildung bot. Die Angiografie zeigte ein intrarenales Aneurysma, welches mittels Coiling ausgeschaltet werden konnte, was zum vollständigen Sistieren der Blutung führte.
Pulsatility Index Reflects Intracranial Pressure Better than Resistive Index in Patients with Clinical Features of Intracranial Hypertension
Authors: Kaloria Narender , Panda Nidhi Bidyut , Bhagat Hemant , Kaloria Neha , Soni Shiv Lal , Chauhan Rajeev , Chhabra Rajesh , Jangra Kiran
Published: March 2020

Background The intracranial pressure (ICP) is measured through various noninvasive methods to overcome complications of invasive ICP monitoring. In this study, transcranial Doppler was used to measure pulsatility index (PI) and resistive index (RI) that were correlated with opening intraventricular ICP. The opening intraventricular ICP was measured with the placement of intraventricular catheter in lateral ventricle without loss of cerebrospinal fluid.

Methods The prospective, observational study was conducted on 40 patients with clinical and radiological features of raised ICP who underwent either endoscopic third ventriculostomy or ventriculoperitoneal shunt surgery. The PI and RI were measured simultaneously with opening ICP measurements under general anesthesia. Both PI and RI were correlated with ICP by using Pearson correlation coefficient. The receiver operating characteristic (ROC) curve was used to get the optimal values of PI ad RI for corresponding ICP values.

Results The mean PI was 1.01 ± 0.41 and mean RI was 0.59 ± 0.32. The mean opening ICP value was 21.81 ± 8.68 mm Hg. The correlation between PI and RI with ICP was a statistically significant with correlation coefficient of 0.697 and 0.503, respectively. The ROC curve shown statistically significant association between PI and ICP from 15 to 40 mm Hg, whereas the association between RI and ICP was from 15 to 25 mm Hg, with various sensitivity and specificity.

Conclusion The opening intraventricular ICP correlated better with PI than RI in patients with features of raised ICP.
Intractable Hiccups due to Isolated Parainfectious Myelitis
Authors: Panda Samhita , Verma Diwakar
Published: March 2020

Demyelinating disorders of the central nervous system are diseases that affect the optic nerves, brain, and spinal cord, leading to visual loss, brainstem dysfunction, and locomotor dysfunction. Intractable vomiting is a rare phenomenon seen due to the involvement of the medulla oblongata in neuromyelitis optica, a rare autoimmune demyelinating disorder. We present our experience with a 33-year-old male who presented to our facility with complaints of intractable hiccups. After extensive evaluation, he was found to have parainfectious myelitis. His symptoms completely resolved following institution of appropriate therapy. Through this report, we hope to bring attention to an unusual cause of intractable hiccups that may often go undiagnosed in general practice.
Synthesis and characterization of CuS, CuS/graphene oxide nanocomposite for supercapacitor applications
Authors: Singhal Rahul , Thorne David , LeMaire Peter K. , Martinez Xavier , Zhao Chen , Gupta Ram K. , Uhl David , Scanley Ellen , Broadbridge Christine C. , Sharma Rakesh K.
Published: March 2020

Supercapacitors or electrochemical capacitors are receiving greater interest because of their high-power density, long life, and low maintenance. We have synthesized CuS nanoparticles and graphene oxide (CuS–GO) nanocomposites for supercapacitor applications because of their low cost and excellent electrochemical properties. The phase purity of each material was determined using powder XRD studies. The bandgap was determined by UV-visible spectrophotometric studies. Scanning electron microscope and transmission electron microscope images revealed the nano-scale morphology of the synthesized particles. All the electrochemical measurements were conducted in a standard three-electrode configuration, using a platinum wire as the counter electrode and Hg/HgO as the reference electrode. CuS and its composites with graphene oxide on nickel foam were used as working electrodes. All the electrochemical measurements were performed in 3M KOH solution. The CuS–GO nanocomposite electrode showed a specific capacitance of 250 F/g, 225 F/g, 182 F/g, 166 F/g, 161 F/g, and 158 F/g at a current density of 0.5 A/g, 1 A/g, 5 A/g, 10 A/g, 15 A/g, and 20 A/g, respectively. CuS–GO electrodes showed a specific capacitance retention of 70% after 5000 charge–discharge cycles at a current density of 5 A/g.
Dependence of discharge ignition on initial condition in atmospheric cascade glow discharges
Authors: Guo Ying , Shi Zhengming , Han Qianhan , Wu Chenyu , Zhang Jing , Shi Jianjun
Published: March 2020

A two-dimensional numerical fluid model was developed to study the effects of initial discharge conditions on the discharge dynamics and characteristics of atmospheric cascade glow discharge including dielectric barrier pulsed discharge and radio frequency (RF) discharge burst. In the dielectric barrier pulsed discharge, the second discharge in the pulse voltage falling phase develops faster than the first discharge in the pulse voltage rising phase, which is demonstrated by the spatiotemporal evolution of discharge and can be attributed to the initial discharge conditions in terms of electron and ion density and their spatial distribution. On the other hand, in the pulse modulated RF discharge coupled with pulsed discharge, the initial conditions of RF discharge can be influenced by the pulsed discharge. The ignition dynamics of RF discharge is compared with and without the pulsed discharge in terms of plasma densities and electric field to show the role of residual plasma species in the initial discharge conditions. It proposes that the discharge ignition both in the pulsed discharge and the RF discharge is dependent on the density and spatial profile of plasma species in the initial discharge conditions, which helps ignite and achieve stable operation of atmospheric glow discharge.
Antiferromagnetic and dielectric behavior in polycrystalline GdFe0.5Cr0.5O3 thin film
Authors: Shi Jianhang , Johnson Mark E. , Zhang Mingwan , Gao Pu-Xian , Jain Menka
Published: March 2020

Single phase materials with both spontaneous electric polarization and magnetization are rare, despite remarkable efforts in developing magnetoelectric multiferroics. In this work, a single-phase polycrystalline GdFe0.5Cr0.5O3 (GFCO) thin film was spin-coated onto a platinized silicon substrate. X-ray diffraction data suggest that the film exhibits an orthorhombic perovskite structure with a Pbnm space group. No other impurity phases were detected. Magnetization measurements reveal the Néel temperature of the GFCO film to be ∼220 K and illustrate a weak ferromagnetic component at 5 K, which could be due to spin canting. Frequency dependent ferroelectric–paraelectric transition was observed around 480 K, indicating the diffuse relaxor-like behavior. The electric field dependent polarization measurements show a lossy behavior below 200 K. The electric field dependent dielectric constant (tunability) measured at 1 MHz in a wide temperature range reveals that the tunability maximizes near the observed dielectric maxima, which further confirms the ferroelectric to paraelectric transition in the present film.
Experimental study on the influence of input solar flux, air flow rate, and absorber parameters on honeycomb ceramic air receiver performance
Authors: Li Qing , Zhang Qianjun
Published: March 2020

Honeycomb ceramic absorbers are considered to be one of the most practical options for the air receiver of a solar central receiver plant. To explore the influence of the average input solar heat flux, air flow rate, and absorber geometric parameters on the honeycomb ceramic air receiver performance, six samples were tested under different conditions and the outlet air temperature, thermal efficiency, and anti-interference characteristics of the receivers were determined. The investigation showed that as the input solar flux or air flow rate increased, the change in the outlet air temperature and thermal efficiency had opposite trends. The sample with the shortest length, thinnest wall, and highest porosity had the best performance. Among the three absorber geometry parameters, the porosity was the dominant factor affecting the receiver outlet temperature and thermal efficiency.
Improved gyrator–capacitor model considering eddy current and excess losses based on loss separation method
Authors: Zhang Huiying , Tian Mingxing , Li Hongchen , Dong Liwei , Sun Lijun
Published: March 2020

The traditional equivalent circuit model based on the reluctance–resistance analogy method is used to model electromagnetic equipment in power systems. However, this model has unreasonable analogy, incomplete magnetic circuit information, and is difficulty to expand. This study proposes an improved gyrator–capacitor (G–C) model and its parameter extraction method for the modeling of electromagnetic devices in power systems. An improved G–C model considering eddy current and excess losses is proposed on the basis of the loss separation method and by utilizing the physical concept of resistance. On the basis of the proposed model, simple calculation methods of the instantaneous loss power and density of the core are presented. A parameter extraction method considering the fitting effect of the entire hysteresis loop and special points is proposed in accordance with the idea of curve fitting. The proposed model and its parameter extraction method are verified by comparing the calculated results with the measured results.
Discovering a rotational barrier within a charge-transfer state of a photoexcited chromophore in solution
Authors: Krueger Taylor D. , Boulanger Sean A. , Zhu Liangdong , Tang Longteng , Fang Chong
Published: March 2020

Methylation occurs in a myriad of systems with protective and regulatory functions. 8-methoxypyrene-1,3,6-trisulfonate (MPTS), a methoxy derivative of a photoacid, serves as a model system to study effects of methylation on the excited state potential energy landscape. A suite of spectroscopic techniques including transient absorption, wavelength-tunable femtosecond stimulated Raman spectroscopy (FSRS), and fluorescence quantum yield measurements via steady-state electronic spectroscopy reveal the energy dissipation pathways of MPTS following photoexcitation. Various solvents enable a systematic characterization of the H-bonding interaction, viscosity, and dynamic solvation that influence the ensuing relaxation pathways. The formation of a charge-transfer state out of the Franck–Condon region occurs on the femtosecond-to-picosecond solvation timescale before encountering a rotational barrier. The rotational relaxation correlates with the H-bond donating strength of solvent, while the rotational time constant lengthens as solvent viscosity increases. Time-resolved excited-state FSRS, aided by quantum calculations, provides crucial structural dynamics knowledge and reveals the sulfonate groups playing a dominant role during solvation. Several prominent vibrational motions of the pyrene ring backbone help maneuver the population toward the more fluorescent state. These ultrafast correlated electronic and nuclear motions ultimately govern the fate of the photoexcited chromophore in solution. Overall, MPTS in water displays the highest probability to fluoresce, while the aprotic and more viscous dimethyl sulfoxide enhances the nonradiative pathways. These mechanistic insights may apply robustly to other photoexcited chromophores that do not undergo excited-state proton transfer or remain trapped in a broad electronic state and also provide design principles to control molecular optical responses with site-specific atomic substitution.
Dynamic mode decomposition of rotorcraft blade tip vortex in hovering state
Authors: Kong Wenjie , Du Hai , Zhang Qinlin , Li Qixuan , Lv Xinyue , Zhou Lianbin , Zhang Weiguo
Published: March 2020

The flow field structure of a rotorcraft is complex; specifically, the rotor tip vortex structure has a great influence on the rotor performance. Therefore, in this paper, the evolution characteristics of rotor tip vortices and the dynamic mode decomposition (DMD) of rotor tip vortices in a rotor hovering state are studied. Through a time-resolved particle image velocimetry experiment, a comparative study of the blade tip vortex flow field at a fixed rotation speed (1500 rpm) and a collective pitch of 6° and 9° was performed. The method of DMD is used for the reduced-order analysis of the vorticity field of the blade tip vortex in the hovering state. By this method, these important vortex structures are extracted and discussed; meanwhile, the future flow field is also reconstructed. The results of flow visualization indicate that the trajectory of the blade tip vortex is moving down the axis, while moving toward the hub in the radial direction in the hovering state. The results of DMD analysis show that during the evolution of the blade tip vortex, different modes have different contributions to the rotor as a whole. In addition, the larger the collective pitch, the larger the modal coefficient amplitude and the slower the stabilization speed.
An Ru-Substituted Tris(ethynyl)methyl Cation: Synthesis, Properties, and Structure of [{Cp(dppe)Ru(C≡C)}3C]PF6·C6H6
Authors: Bruce Michael I. , Burgun Alexandre , Nicholson Brian K. , Zaitseva Natasha N.
Published: March 2020

The dark blue complex [{Cp(dppe)Ru(C≡C)}3C]PF6 1 (Cp=cyclopentadienyl, dppe=1,2-bis(diphenylphosphino)ethane) was obtained in 46% yield by treatment of Ru(C≡CH)(dppe)Cp with CuCl/TMEDA (tetramethylethanediamine), followed by KOH and [NH4]PF6 in acetone; it was accompanied by known complexes {Cp(dppe)Ru}C≡CC≡C{Ru(dppe)Cp} 2 (22%) and yellow [1,3-{Cp(dppe)Ru}2C4H3]PF6 3 (2.6%). The structure of the cationic fragment of 1 in its benzene solvate consists of a central planar C attached to three C≡CRu(dppe)Cp fragments. The cation of 3 consists of a cyclobuten-1,3-diyl group bearing two Ru(dppe)Cp groups. The 13C NMR resonance of the central C in 1 is found at δ 66.11. The cyclic voltammogram of 1 contains three irreversible oxidation waves at +0.87, +0.79, and +0.25V, together with a reversible reduction wave at −1.38V (versus FeCp2/[FeCp2]+).
IL-21 is a broad negative regulator of IgE class switch recombination in mouse and human B cells
Authors: Yang Zhiyong , Wu Chung-An M. , Targ Sasha , Allen Christopher D.C.
Published: March 2020

IgE antibodies may elicit potent allergic reactions, and their production is tightly controlled. The tendency to generate IgE has been thought to reflect the balance between type 1 and type 2 cytokines, with the latter promoting IgE. Here, we reevaluated this paradigm by a direct cellular analysis, demonstrating that IgE production was not limited to type 2 immune responses yet was generally constrained in vivo. IL-21 was a critical negative regulator of IgE responses, whereas IFN-γ, IL-6, and IL-10 were dispensable. Follicular helper T cells were the primary source of IL-21 that inhibited IgE responses by directly engaging the IL-21 receptor on B cells and triggering STAT3-dependent signaling. We reconciled previous discordant results between mouse and human B cells and revealed that the inhibition of IgE class switch recombination by IL-21 was attenuated by CD40 signaling, whereas IgG1 class switch recombination was potentiated by IL-21 in the context of limited IL-4. These findings establish key features of the extrinsic regulation of IgE production by cytokines.
BMS current algebra in the context of the Newman–Penrose formalism
Authors: Barnich Glenn , Mao Pujian , Ruzziconi Romain
Published: March 2020

Starting from an action principle adapted to the Newman–Penrose formalism, we provide a self-contained derivation of BMS current algebra, which includes the generalization of the Bondi mass loss formula to all BMS generators. In the spirit of the Newman–Penrose approach, infinitesimal diffeomorphisms are expressed in terms of four scalars rather than a vector field. In this framework, the on-shell closed co-dimension two forms of the linearized theory associated with Killing vectors of the background are constructed from a standard algorithm. The explicit expression for the breaking that occurs when using residual gauge transformations instead of exact Killing vectors is worked out and related to the presymplectic flux.
Experience co-creation of city visitors from the perspective of technological engagement
Authors: Mohd N S , Ismail H N , Jaafar S M R S , Isa N
Published: March 2020

The population today have immersed in mobile technology as ICTs is seen as capable in supplementing human social and psychological experience. Similarly, city visitors often perceived mobile technology as an inevitable partner in facilitating space consumption of an unfamiliar environment. Especially in urban setting, great incursion of technology in mediating human-destination encounter had manipulated visitor’s cognitive conceptualisation process, and arguably critical for destination management and liveable city making. Due to high dependency on mobile assistance among current visitors market, cognitive stimulation from tech-human engagement was seen as influential force in psychologically motivating travel satisfaction and destination loyalty. Therefore, perspective on how visitor’s cognitive experience affected by mobile engagement is critical in understanding the continuum of technology-mediated experience. The study was executed at Kuala Lumpur City Centre and the population was confined to millennial generation due to visibility as current tourism market. On-going survey of 235 respondents was conducted on 56 identified main attractions within the city centre. Preliminary findings reveal respondents’ desire towards deviation of smartphone engagement from daily uses during travel, as well as significant of interactive and value instilling engagement to uplift experience. This paper concluded with indication of research limitations and possible future research in this area.
The study of connectivity at Jalan Slamet Riyadi, Surakarta using the space syntax analysis
Authors: Adi A F , Marlina A , Rahayu P
Published: March 2020

Jalan (street) Slamet Riyadi in Surakarta has a pedestrian lane called City Walk located at the centre point of the city. Having been a decade, this pedestrian lane, however, is rarely used. The lack of connectivity may become the reason why it is abandoned. Connectivity is one of the important aspects in sustainable development. This research aims to understand the connectivity at Jalan Slamet Riyadi using the Space Syntax as the analytical instrument. The research procedures employed were (1) creating axial maps by using the Open Street Map (OSM) as the data source, (2) arranging outputs with the field observation, and (3) interpreting the street connectivity using the space syntax analysis with Depthmapx program. The findings obtained from Depthmapx indicate that Jalan Slamet Riyadi has high connectivity and is tremendously integrated. These findings indicate there may be other elements, beside connectivity, able to make the city walk more utilized; and these elements are the availability of supporting facilities and the proximity of the housing area to the activity centre. In conclusion, the research findings can be furthermore included in the policymaking related to the Surakarta City future urban planning that aims to improve connectivity and to achieve sustainable city development.
The utilization of the railway side as children’s public space (the case study of Patukan Station, Gamping, Sleman, D.I Yogyakarta)
Authors: Suminar L
Published: March 2020

The existence of public space, as space for people to socialize and spend their leisure time, is an important thing to be paid attention to in urban planning. However, the lack of urban public space, especially for children, makes some places turned into public space illegally by the community. This study aims to explain the utilization of the railway side as children’s public space, as well as the impact caused.The location of the research is along the railway sideofPatukan Station. This research is using the qualitative method. The sampling technique used is an accidental sampling.The research was done through observation to see characteristics of the space, kinds of activities, the doers, also interview toward the visitors and merchants. The result of this study shows that the utilization of the railway side could attract the community to come regularly to do some activities. Meanwhile, there are some limitations to the railway side as an illegal children’s public space. The communities remain uncomfortable and realized that they need proper public space that is more organized and managed legally by the government or other competent sectors. They are expected to provide children public space which can be easily accessed by society.
Women in transition: Gendered hosts in Karimunjawa Island tourism, Indonesia
Authors: Indriansyah N R , Rossika A , Rahmat Y N
Published: March 2020

Karimunjawa Island is one of the many attractive tourist destinations in Indonesia. The central government has designated it as a National Strategic Tourism Area (KSPN), following the positive trend of tourist arrivals and the plan to integrate the area with other tourism destinations. Meanwhile, transformations are also happening in the local community, including changes in sources of livelihood. The most prevalent of this is the increase in women’s participation in the tourism industry, especially how they take on important jobs that lead to increased income at the household level. This study explores the relationship between tourism development and the increase in participation of women in the productive age, the variations amongst different villages on the same island, and the influential factors in this phenomenon. By using statistical data, a quantitative analysis was conducted to uncover the connection between differences in women’s productivity and improvements in village prosperity. The results were then further analyzed qualitatively to uncover the reasons behind the relationship. Interviews with relevant stakeholders unearthed information regarding the reasons for the changes and the underlying motivations that caused it. The study revealed that although the involvement of women in tourism may positively impact household prosperity, the issues of gender inequality in terms of tourism employment persists.
Disaster, gender, and space: Spatial vulnerability in post-disaster shelters
Authors: Aryanti T , Muhlis A
Published: March 2020

Many studies have shown that women and other marginalized groups are extra vulnerable during disasters and in the aftermath. These groups experience discrimination in access to resources and are more exposed to sexual harassment and violence. Accepting the premise that space shapes gender relations, this article examines how post-disaster space plays a part in the occurrence of gender-based violence. It discusses the literature on space and gender issues in the post-disaster phase, particularly the response phase and recovery phase. The study reviews literature broadly from 1990 to the present because of the limited literature on gender and space in a disaster context. This article argues that the disappearance of boundaries and the collapse of territoriality due to disaster contribute to the occurrence of gender-based violence and the construction of fear among marginalized groups. This article incorporates the concept of defensible space and gendered space to propose a gender-sensitive space in post-disaster shelters. It concludes that emergency and rehabilitation shelters mustconsider privacy and define the territory for each family. Furthermore, these sheltersshould allow for community surveillance to be arranged in order to enhance the sense of security for all community members.
Resilience and livelihoods: Bringing together two approaches to explain social capital in kampung kota communities
Authors: Istanabi T
Published: March 2020

Resilience integrates the relationship between mitigation, adaptation and innovation processes. Resilience is also closely related to the strength of social capital of a community. In Indonesia, strong social capital is found in a social community of kampung kota. Social capital is also related to the livelihoods theory approach. Livelihoods also view that a community has social capital that can overcome threats and pressures. So the two approaches have the same object of study, namely the ability of social capital to deal with threats and pressures. This study aims to find out how the concept of resilience and livelihoods can explaining social capital that is formed in kampung kota communities. This study uses a case-study methodology by conducting exploration using in-depth interviewing techniques from important various sources. Kampung Laweyan is a traditional batik village that has passed the ups and downs to be able to survive until now. Meanwhile, Kampung Sudiroprajan was a Chinatown village that had faced social conflict. Finally, this study found a close theory that could complement each other on how resilience and livelihoods could explain social capital in kampung kota. Resilience is a more effective approach to process while livelihood is a more focused approach to actors.
Elderly safety and accessibility as planning considerations for residential areas along the Alalak Riverbank, Banjarmasin
Authors: Hartono R , Indah M F
Published: March 2020

The community living along the Alalak riverbank in Banjarmasin is highly dependent on the river including transportation purposes, economic, social, and cultural support, and for daily needs. This underlines the importance of access to the river, which supported by wooden footbridges. Meanwhile, community members who depend on the river vary from children to the elderly whereas the elderly have different needs compared to other age groups. Several accidents with the elderly have been recorded in the last five years due to the poor accessibility to facilities. This study evaluated the cause of the poor accessibility to facilities for the elderly and the community planning process in the area. The planning process is discussed within the framework of community development and transformative planning theories. The study uses descriptive-qualitative methods. Five neighborhood groups or RukunTetangga (RT) have been chosen as samples using purposive sampling. This study demonstrated that there is no established planning process for the provision and constructionof access facilities. The poor accessibility to facilities iscausedby two factors, i.e., the lack of consideration for the needs of the elderly in the planning process, and poor maintenance.
A community-based approach to riverine management of the Kali Pepe in Surakarta
Authors: Handayani K N , Miladan N
Published: March 2020

Most urban villages in Surakarta are situated in the riverine area. These villages experience the effects of urbanization. One of the most significant negative effects of urbanization in the riverine area of Kali Pepe is the environmental degradation of its ecosystem. This problem raises many issues, physical as well as social and economic. Therefore, urban villages need high levels of community resilience, which refers to the capacity of a community to resist various risks through specific management and adoption of good practices. This study focuses on community initiatives. These initiatives symbolize the endeavor to perceive, interact, or even adapt to the river’s condition. In Surakarta, there are various community initiatives such as Forum Solo Hijau, Ngerekso Lapen, SIBAT (which refers to Community-Based Disaster Preparedness) at the neighborhood scale in the urban villages of Sewu and Sangkrah. This research aims to identify the communities’ initiatives in the riverine area of Kali Pepe, Surakarta and understand how the local communities interact with the river. This research used the field research approach for data collection comprising in-depth interviews with local leaders and community representatives. This research used a qualitative-typological approach by analyzing the (1) formation process, (2) the role of actors, and (3) the aims of each community’s endeavor. The findings of this research provide a new perspective for understanding how communities experience the rivers and provide a guideline on how community initiatives can contribute to the sustainability of the river.
Implementation of affordable housing programmes in Johor, Malaysia for sustainable housing
Authors: Masram H , Misnan S H , Yassin A M
Published: March 2020

Sustainability in housing includes the concept of housing affordability that revolves around the elements of sustainable housing affordability. Affordable housing provision could be discussed under the context of social equity where it demonstrates the ability of all segments of the population to have access to housing. Housing production in Malaysia is mostly dominated by private sector developers and is generally based on supply and demand in the open market. Government intervention in the form of policies and programmes that include affordable housing programmes were introduced to assist all segment of population to have access to housing. This study looks at the implementation of these programmes in the state of Johor, Malaysia. The objectives of this paper are to define housing sustainability through implementation of affordable housing programmes; to determine if these programmes comply with the concept of sustainable housing affordability. Finally, general issues on its implementation will be identified. Findings indicates that the concept of the housing programmes introduced fulfils the criteria for sustainable housing affordability, such as in terms of its price, quality of house, specifications, proximity to facilities and to work place. Some of the main issues identified on its implementation at state and local government can be summarised as the existence of separation of jurisdictions and authorities between the federal and state governments; conflicting requirement for policies between state and federal government and lack of specific Standard Operating Procedure (SOP), which contributes towards delays in the overall development process.
KORPRI housing development in Salatiga City: Backlog, problems and sustainability
Authors: Sunarti  , Yuliastuti N , Tyas W P , Sari D P P
Published: March 2020

Housing backlog is a difficult problem to deal with, especially for low income communities. A way to reduce home ownership backlog in Salatiga City is the development of housing for KORPRI members, but now the ownerships and functions have changed. Based on these problems, the purpose of this study is to examine the development of KORPRI housing in Salatiga City with its problems and sustainability. The analysis technique is descriptive quantitative using data collected by distributing questionnaires to 40 households randomly and field observations of houses, its facilities and infrastructure. The results showed that low-cost housing development programs for civil servants of KORPRI members in Salatiga City had changed ownership of 62.5% to other people who were not low-income people and did not help reduce the backlog. The mechanisms and initial commitments were violated a lot by civil servants, who were the buyers, leaving many problems. The sustainability of housing development for KOPRI members that used government-owned land assets is to reduce the occupancy backlog, not the ownership backlog, i.e. houses with usufructuary rights.
Territorial space: Structural changes in a religious tourism area (The case of Kampung Mahmud in Bandung,West Java, Indonesia)
Authors: Susanti I , Permana A Y , Pratiwi W D , Widiastuti I
Published: March 2020

At specific periods in time, settlements will experience changes (transformations) related to time and human activities. Such change is a process of adapting and responding to human needs for space. In Kampung Mahmud, religious tourism such as Muslim pilgrimage activities and Islamic events in the settlement causes changes in the space of settlements, especially in dwellings. This study aims to determine the territorial structural changes of settlement spaces when religious tourism activities in Kampung Mahmud take place. This research uses a mixed-method approach of quantitative and qualitative methods. The observed transformation is in the form of transient or temporal changes of space. The observed changes during religious tourism activities were territorial shifts from private areas to shared areas. A shift in territorial structure could be seen as an increase or decrease in structure. The study found three schemes of territorial structure changes in Kampung Mahmud; the settlement experienced an increased shift in territorial structure in both the outer and inner spaces of the settlements. The three schemes of the shifting territorial structures create a shared space.