bluuebunny/crossref_metadata_2025_split huggingface dataset:
A Method for Preparing Superparamagnetic Nanomaterial
Authors: Zhu Xiaobing , Zhang Yi , Ye Jian , Wang Lei 
Published: June 2023

Abstract
Substances with superparamagnetism, a special magnetic effect, are magnetized under external magnetic field. When the applied magnetic field disappears, superparamagnetic substances have almost zero magnetization intensity, with quite small coercivity. The performance of magnetic powder or magnetic suspension used in magnetic particle detection greatly affects detection sensitivity. This paper studies a new method for preparing nano-superparamagnetic non-destructive testing materials by combing membrane technology and chemical co-precipitation method. Magnetic nano-ferroferric oxide particles were prepared by preparing membrane reactor based on chemical co-precipitation method to find the optimal synthesis conditions for nano-ferroferric oxide particles. Polymer nano-magnetic materials with good dispersibility, superparamagnetism, high dispersibility, uniform particle size distribution were obtained, which can well detect cracks, especially small cracks. It is a good magnetic nondestructive testing material.
A Learning Sentiment Database for Machine Learning
Authors: Zhang Jing , Hu Siquan , Shi Zhiguo , Han Shumin 
Published: June 2023

Abstract
Learners’ affective states play a crucial role in learning evaluation, and the external expressions that can directly reflect affect are facial expressions. However, the sample size of the database for the learning process of learners is limited, and most of the existing expression databases are the expressions of ordinary people, which is difficult to support an in-depth study of the emotional states of learners in learning scenarios. In order to better study the influence of learners’ emotion on the learning state, we built a learning expression database for machine learning, and at the same time labeled the data with expression-emotion state, and finally formed a database of 8,000 expression images containing 36 learners, which is important for studying learners’ emotion state under learning scenarios.
A tensile property measuring system for miniaturized samples from 300 K to 70 K based on pulse tube cryocooler
Authors: Qi H.Y. , Shen F.Z. , Zhang H.C. , Huang C.J. , Han Y.M. , Zhao Y.C. , Xin J.J. , Geng Z. , Wang W. , Li L.F. , Zhou Y. 
Published: June 2023

Abstract
With the rapid development and wide application of cryogenic, superconducting and space technologies in engineering fields, measurements of the mechanical properties especially the tensile properties of small-sized samples at cryogenic temperatures are more and more important. In this study, a tensile property measuring system for miniaturized samples was designed and built, where the samples can be measured from 300 K to 70 K with a resolution of 0.1 K. The cryogenic environment was provided by a pulse tube cryocooler. The force load applied to the sample was up to 10 N with a resolution of 0.001 N. The structure of the cryogenic system and sample holders were specially designed for miniaturized samples. A control and automatic data acquisition system was used to control and acquire data from all devices of the instrument. The simulations of the stretching part under load at cryogenic temperature were performed to ensure the measurement accuracy and reliability. To verify the performance and accuracy of the system, the tensile properties of two kinds of fine high-purity copper wires were measured at both 77 K and 300 K. The tensile measurement results were discussed and the measurement uncertainty of the system was analyzed. With different clamps more kinds of mechanical measurements of miniaturized samples can be carried out on this system.
Liquefaction Mitigation of Ramp On Kretek 2 Bridge
Authors: Galag C T S A , Faris F , Adi A D 
Published: June 2023

Abstract
The Kretek 2 Bridge was built over the Opak River where there is an active fault. According to bore log data and embankment site analysis, there is potential for liquefaction at a depth of 0 - 3 meters. Due to space limitations, ramp of bridge must be able to stand upright. An alternative treatment that can be implemented in this condition is to reinforce the embankment at the bridge ramp with the Mechanically Stabilized Earth Wall system. Analysis of liquefaction potential using the method of Idriss and Boulanger. Analysis of the application of the planned MSE wall was carried out based on the external, internal, and global stability in dynamic conditions in the subgrade after replacing the subgrade in the detected layer of liquefaction potential. The method for calculating the lateral pressure caused by an earthquake uses the pseudostatic method. The MSE wall with soil replacement meets the requirements for external, internal, and global stability under dynamic conditions to be an alternative solution to mitigate liquefaction potential and increase soil bearing capacity and limitation area problems. Reinforcement of friction tie using granular embankment gets good results in the calculation of safety factor breaking, pull out, overturning, and sliding.
Axial and lateral bearing capacity assessment of bored piles on medium-dense sand and liquefiable potential based on numerical simulation
Authors: Zakariya A , Rifa’i A , Ismanti S , Hidayat M. S. 
Published: June 2023

Abstract
Liquefaction on bridges can cause structural failure due to loss of soil strength. The Showa Bridge that collapsed in 1964 Niigata earthquake was caused by buckling in piles as the soil layer liquefied and friction losses. In addition, there was a case of Palu IV bridge collapse in Indonesia during the recent 2018 Palu earthquake, which indicated have been affected by earthquakes and liquefaction. This study examines the reliability of the bored pile foundation of the Kretek 2 Bridge in Bantul Regency, Yogyakarta Special Region Province, for axial and lateral bearing capacity. This research method uses the soil structure interaction and 3D numerical simulation by Midas Civil and Midas GTS NX pile modeling. The pile driving analysis and lateral static loading test were also conducted, which can be compared to MIDAS results. For the foundation modeling result, there is an increase in axial and moment forces but a decrease in shear forces during liquefaction. While the lateral displacement increases significantly in the liquefaction state, foundation performance is still stable. Therefore, the foundation of the kretek 2 bridge is sufficient to support axial and lateral load both in a static state and a liquefaction state.
The Effect of High Pore Water Pressure on Liquefaction Potential in Sidoarjo Mud Volcanoes (LUSI)
Authors: Wijanarko D , Adi A D , Rifa’i A 
Published: June 2023

Abstract
LUSI until now is still active and holds the potential for subsequent disasters due to the influence of high pore water pressure in the affected area. The presence of high pore water pressure will cause a decrease in effective stress and decrease in soil / rock strength. This type of subsequent disaster is closely related to the process of liquefaction which has the potential to occur with the addition of earthquake events. Analysis of liquefaction potential with empirical analysis on standard penetration test (SPT) based evaluation, with input of soil properties parameters, seismicity, and groundwater level parameters. The groundwater level parameter in the calculation will show a normal pore water pressure value in accordance with the depth of the water-saturated layer. Input of high pore water pressure parameters so far has not been done. CPT-u measurement data for pore pressure value input consists of 13 points of measurements was on the northern embankment, with the lowest level of stability. The input of these parameters will provide variations in the differences in the level of potential liquefaction in the study area. The result is changes occur in the decrease in the safety factor value ranging from 0.1-0.4 and the change in the liquefaction potential index (LPI) value from originally low to high, and originally high to very high. The anomaly input of pore pressure in CPT-u measurement results ranges from 40%-70% higher than normal pore pressure in the sand layer. Analysis of the potential for liquefaction in the study area showed that the results of the high-very high liquefaction potential in the northern and eastern research areas, and the low Liquefaction potential was in the southern and western areas.
The Potential of Bentonite and Chitosan Mixtures as Clay Liner Base Material
Authors: Hidayat T , Arifin Y F 
Published: June 2023

AbstractA polymer-enhanced bentonite-sand mixture has been widely used as a clay liner. This research focuses on the potential use of chitosan as a natural polymer mixed with bentonite as a clay liner base material. The bentonite used is a type of calcium bentonite, which is easily obtained in the market. Meanwhile, chitosan is produced from shrimp shell waste and is also easily available in the market. The process of mixing chitosan with a percentage of 2–6% of bentonite was carried out using a certain method, which is described in detail in the article. The materials’ physical, chemical, and engineering characteristics, such as Atterberg limits, permeability, and compressive strength, were examined after mixing. The results show that the mixing process was successful for the finding of minerals and functional groups based on the XRD and FTIR results. Promising results of the study include larger clusters, higher plasticity, decreased permeability, and higher compressive strengths of the mixtures after chitosan was added to bentonite.
Rainwater Harvesting Tank Sizing: A Case in Urban Catchments in Metro Cebu
Authors: Oraya A F A , Cuba G J G , Varquez L L M , Hermosa J C R 
Published: June 2023

Abstract
Rainwater is an abundant resource in the Philippines and when properly collected and managed, can help address flood problems. Rainwater harvesting has been practiced for years and has been viewed as one of the better options for flood mitigation in urban areas compared to other storm water management practices. It does not require large land area and cost per area is high in these locations. However, there is a challenge in selecting the suitable tank size. This paper investigates if the increase in stormwater runoff brought about by the changes in landuse in urbanized catchments can be represented by a single coefficient similar to what is being presented in the Philippine Green Building Code and in other local ordinances in the country. Simulations through HEC-HMS of three urban catchments in Metro Cebu showed that the increase in volume is highly varying such that the coefficient produced for each catchment was so distinct that no single average coefficient can be drawn. Thus, analysis should be catchment-based to determine the suitable tank size in rainwater harvesting systems as an option for flood mitigation.
Important Factors for Inclusive Pedestrian Ways Development in Pecinan Semarang City
Authors: Wungo G L , Mussadun Mussadun , Novianto A 
Published: June 2023

Abstract
Urban Planning is strongly related to public spaces. Open public spaces are an essential element in sustaining community activity spaces. Social, economic, and other activities regularly happen in this area. Pecinan (Chinatown) is one of the heritage areas in Semarang that still has high community activity. Narrow and crowded street in this area becomes one the issues for pedestrian. The unsafe feeling occurs when people cross the street. The store’s activity on the side of the street also creates a fuzzy condition for pedestrians. The study aims to the sustainability and inclusivity of pedestrian ways in Pecinan. Data Collection is done by observing the actual condition of 1380 samples in the field through interviews and questionnaires for the pedestrian. The method of this study uses quantitative methods and use behavioral mapping for the analysis methods. The result of the study shows that pedestrians tend to rank accessibility as the most important factor, followed by transit points, infrastructure, and parking areas. The result also shows that continuous arcade shade and vegetation coverage as other factors that affect pedestrian comfort in Southeast Asian Country climates condition. The result also reveals that an active frontage of a store creates a more lively atmosphere. The recommendation based on the study is to relocate the street vendors’ activity alongside the narrow road. The relocation also should still be near the area of the Pecinan.
Closed-loop sound source localization in neuromorphic systems
Authors: Schoepe Thorben , Gutierrez-Galan Daniel , Dominguez-Morales Juan P , Greatorex Hugh , Jimenez-Fernandez Angel , Linares-Barranco Alejandro , Chicca Elisabetta 
Published: June 2023

Abstract
Sound source localization (SSL) is used in various applications such as industrial noise-control, speech detection in mobile phones, speech enhancement in hearing aids and many more. Newest video conferencing setups use SSL. The position of a speaker is detected from the difference in the audio waves received by a microphone array. After detection the camera focuses onto the location of the speaker. The human brain is also able to detect the location of a speaker from auditory signals. It uses, among other cues, the difference in amplitude and arrival time of the sound wave at the two ears, called interaural level and time difference. However, the substrate and computational primitives of our brain are different from classical digital computing. Due to its low power consumption of around 20 W and its performance in real time the human brain has become a great source of inspiration for emerging technologies. One of these technologies is neuromorphic hardware which implements the fundamental principles of brain computing identified until today using complementary metal-oxide-semiconductor technologies and new devices. In this work we propose the first neuromorphic closed-loop robotic system that uses the interaural time difference for SSL in real time. Our system can successfully locate sound sources such as human speech. In a closed-loop experiment, the robotic platform turned immediately into the direction of the sound source with a turning velocity linearly proportional to the angle difference between sound source and binaural microphones. After this initial turn, the robotic platform remains at the direction of the sound source. Even though the system only uses very few resources of the available hardware, consumes around 1 W, and was only tuned by hand, meaning it does not contain any learning at all, it already reaches performances comparable to other neuromorphic approaches. The SSL system presented in this article brings us one step closer towards neuromorphic event-based systems for robotics and embodied computing.
Depression Symptoms and Physical Activity in Veterans With COPD: Insights From a Web-Based, Pedometer-Mediated Physical Activity Intervention
Authors: Bamonti Patricia M , Perndorfer Christine , Robinson Stephanie A , Mongiardo Maria A , Wan Emily S , Moy Marilyn L 
Published: June 2023

Abstract

Background
Depression is known to limit physical activity (PA) among individuals with chronic obstructive pulmonary disease (COPD). However, whether and how depression influences the effectiveness of PA interventions is unknown.

Purpose
The study examined the association between baseline depression symptoms and change in daily step count and whether group assignment to a web-based, pedometer-mediated PA intervention moderated the association between baseline depression symptoms and change in daily step count.

Methods
Secondary analysis included two cohorts of U.S. Veterans with COPD (n = 212; 97% male; mean age 69 ± 8 years) assessed at baseline and 3 months. Cohorts 1 and 2 were randomly assigned to the same PA intervention (n = 111) or a control group (n = 101). Multivariate regressions tested the main effects of baseline depression symptoms (BDI-II total and cognitive-affective and somatic subscales) on change in daily steps, as well as the interaction between baseline BDI-II and subscales and group assignment on change in daily steps.

Results
Greater BDI-II total score (B = −31.8, SE = 14.48, p = .030) and somatic subscale scores (B = −99.82, SE = 35.76, p = .006) were associated with less improvement in daily step count. There was a significant interaction between baseline cognitive-affective subscale and the intervention predicting change in daily step count (B = −88.56, SE = 42.31, p = .038). When cognitive-affective subscale scores were ≥1 SD above the mean, the intervention was no longer associated with an increase in daily step count (p = .585).

Conclusions
Depression should be routinely assessed and targeted as part of PA promotion efforts.
Detection of brain somatic mutations in focal cortical dysplasia during epilepsy presurgical workup
Authors: Checri Rayann , Chipaux Mathilde , Ferrand-Sorbets Sarah , Raffo Emmanuel , Bulteau Christine , Rosenberg Sarah Dominique , Doladilhe Marion , Dorfmüller Georg , Adle-Biassette Homa , Baldassari Sara , Baulac Stéphanie 
Published: June 2023

Abstract
Brain-restricted somatic variants in genes of the mechanistic target of rapamycin signalling pathway cause focal epilepsies associated with focal cortical dysplasia type II. We hypothesized that somatic variants could be identified from trace tissue adherent to explanted stereoelectroencephalography electrodes used in the presurgical epilepsy workup to localize the epileptogenic zone.
We investigated three paediatric patients with drug-resistant focal epilepsy subjected to neurosurgery. In the resected brain tissue, we identified low-level mosaic somatic mutations in AKT3 and DEPDC5 genes. We collected stereoelectroencephalography depth electrodes in the context of a second presurgical evaluation and identified 4/33 mutation-positive electrodes that were either located in the epileptogenic zone or at the border of the dysplasia.
We provide the proof-of-concept that somatic mutations with low levels of mosaicism can be detected from individual stereoelectroencephalography electrodes and support a link between the mutation load and the epileptic activity. Our findings emphasize future opportunities for integrating genetic testing from stereoelectroencephalography electrodes into the presurgical evaluation of refractory epilepsy patients with focal cortical dysplasia type II to improve the patients’ diagnostic journey and guide towards precision medicine.
Default mode network functional connectivity strength in utero and the association with fetal subcortical development
Authors: Correa Susana , Nichols Emily S , Mueller Megan E , de Vrijer Barbra , Eagleson Roy , McKenzie Charles A , de Ribaupierre Sandrine , Duerden Emma G 
Published: June 2023

Abstract
The default mode network is essential for higher-order cognitive processes and is composed of an extensive network of functional and structural connections. Early in fetal life, the default mode network shows strong connectivity with other functional networks; however, the association with structural development is not well understood. In this study, resting-state functional magnetic resonance imaging and anatomical images were acquired in 30 pregnant women with singleton pregnancies. Participants completed 1 or 2 MR imaging sessions, on average 3 weeks apart (43 data sets), between 28- and 39-weeks postconceptional ages. Subcortical volumes were automatically segmented. Activation time courses from resting-state functional magnetic resonance imaging were extracted from the default mode network, medial temporal lobe network, and thalamocortical network. Generalized estimating equations were used to examine the association between functional connectivity strength between default mode network–medial temporal lobe, default mode network–thalamocortical network, and subcortical volumes, respectively. Increased functional connectivity strength in the default mode network–medial temporal lobe network was associated with smaller right hippocampal, left thalamic, and right caudate nucleus volumes, but larger volumes of the left caudate. Increased functional connectivity strength in the default mode network–thalamocortical network was associated with smaller left thalamic volumes. The strong associations seen among the default mode network functional connectivity networks and regionally specific subcortical volume development indicate the emergence of short-range connectivity in the third trimester.
Association of left ventricular strain–volume loop characteristics with adverse events in patients with heart failure with preserved ejection fraction
Authors: Kerstens Thijs P , Weerts Jerremy , van Dijk Arie P J , Weijers Gert , Knackstedt Christian , Eijsvogels Thijs M H , Oxborough David , van Empel Vanessa P M , Thijssen Dick H J 
Published: June 2023

Abstract

Aims
Patients with heart failure with preserved ejection fraction (HFpEF) are characterized by impaired diastolic function. Left ventricular (LV) strain–volume loops (SVL) represent the relation between strain and volume during the cardiac cycle and provide insight into systolic and diastolic function characteristics. In this study, we examined the association of SVL parameters and adverse events in HFpEF.

Methods and results
In 235 patients diagnosed with HFpEF, LV-SVL were constructed based on echocardiography images. The endpoint was a composite of all-cause mortality and Heart Failure (HF)-related hospitalization, which was extracted from electronic medical records. Cox-regression analysis was used to assess the association of SVL parameters and the composite endpoint, while adjusting for age, sex, and NYHA class. HFpEF patients (72.3% female) were 75.8 ± 6.9 years old, had a BMI of 29.9 ± 5.4 kg/m2, and a left ventricular ejection fraction of 60.3 ± 7.0%. Across 2.9 years (1.8–4.1) of follow-up, 73 Patients (31%) experienced an event. Early diastolic slope was significantly associated with adverse events [second quartile vs. first quartile: adjusted hazards ratio (HR) 0.42 (95%CI 0.20–0.88)] after adjusting for age, sex, and NYHA class. The association between LV peak strain and adverse events disappeared upon correction for potential confounders [adjusted HR 1.02 (95% CI 0.96–1.08)].

Conclusion
Early diastolic slope, representing the relationship between changes in LV volume and strain during early diastole, but not other SVL-parameters, was associated with adverse events in patients with HFpEF during 2.9 years of follow-up.