bluuebunny/crossref_metadata_2025 huggingface dataset:
The study of charge injection mechanism of C60/CuPc organic heterojunction connector layer
Authors: Lu Feiping , Wang Jinjiang , Deng Yanhong
Published: July 2020

The charge injection mechanism of a connector layer is one of the critical issues influencing the performance of tandem organic light-emitting diodes (OLEDs). In this paper, to explore the charge injection mechanism of an organic heterojunction connector (OHJC) layer, we studied the device current density (J) characteristics generated by the C60/CuPc OHJC layer under different applied voltages (V). By analyzing the log(J)–V1/2 and ln(J/E)–1/E2 characteristics of devices, we found that the charge injection mechanism of the C60/CuPc OHJC layer is in accordance with the Richardson–Schottky model. This study can be a theoretical basis to design high-efficiency OLEDs.
First-principles calculations of the electronic structure, chemical bonding, and thermodynamic properties of USiO4
Authors: Su Li , Wan Lei , Gao Tao , Ao Bingyun
Published: July 2020

The density functional theory (DFT) + U method is adopted to study the electronic structure, magnetism, chemical bonding, and thermodynamic properties of USiO4. A bandgap of 3.1 eV is obtained by analyzing the band diagram of USiO4. The calculated structural parameters are consistent with the recent experimental results. The charge density and charge density differences are studied in order to analyze the chemical bonds in USiO4. The results indicate that interactions within USiO4 are mostly ionic and exhibit weak covalent character. In addition, phonon behavior is studied in detail. We predict phonon frequencies and assign and analyze the Raman-active and infrared-active modes at the Γ point. Furthermore, thermodynamic properties such as the internal energy ΔE, Helmholtz free energy ΔF, constant-volume specific heat CV, and entropy S are investigated in the region between 0 K and 1000 K. The results are expected to provide useful information for subsequent experiments on USiO4.
Prescribers aware: a cross-sectional study from New Zealand emergency departments on the substances used in intentional self-poisoning and their sources
Authors: Kumpula Eeva-Katri , Lambie Bruce , Quigley Paul , Nada-Raja Shyamala , Norris Pauline
Published: July 2020

ABSTRACT INTRODUCTIONIntentional self-poisoning or self-harm through poisoning, is a common cause of presentations to emergency departments (EDs). National datasets do not allow identification of the substances most commonly used in hospital-treated intentional self-poisoning in New Zealand, nor do they capture sources of these substances. AIMTo investigate the specific substances used in intentional self-poisoning and the sources from which they are obtained. METHODSIn this cross-sectional study, information about the demographics and presentation particulars of intentional self-poisoning patients aged ≥16 years, presenting to three public EDs, as well as the substances they used in the self-poisoning event and the sources of these agents, were collected prospectively. RESULTSA total of 102 patients were recruited from the potentially eligible 1137 intentional self-poisoning patients presenting to the three EDs during the study period. Seventy per cent used their own prescription medications and 24% used medicines they purchased themselves. Paracetamol and ethanol were most commonly encountered substances. Patients presented a median of 1.9h after exposure (interquartile range 1.0–3.3h), 62% self-referred, 60% presented to the ED in the evening or at night and 66% were triaged into Australasian Triage Scale 3 (to be seen within 30min). Two-thirds were referred to emergency psychiatric services. DISCUSSIONCollecting specific substance information, such as from this study, can assist in planning specific activities to prevent intentional self-poisoning. As most people used their prescribed medicines, the findings can inform and assist doctors in their prescribing practices when they manage patients at risk of self-poisoning.
Calcium-triggered fusion of lipid membranes is enabled by amphiphilic nanoparticles
Authors: Tahir Mukarram A. , Guven Zekiye P. , Arriaga Laura R. , Tinao Berta , Yang Yu-Sang Sabrina , Bekdemir Ahmet , Martin Jacob T. , Bhanji Alisha N. , Irvine Darrell , Stellacci Francesco , Alexander-Katz Alfredo
Published: July 2020

Significance

Lipid membrane fusion is a critical component of biological transport, communication, and developmental processes. The fusion reaction is kinetically constrained since it contains multiple large energy barriers, so proteins and ions are used by natural systems to intervene and catalyze the reaction toward biologically relevant timescales. Here, we demonstrate how amphiphilic nanoparticles can prime lipid membranes for fusion so that complete fusion proceeds only upon exposure to an excess of calcium or other stimulus that would stress the outer leaflet. This is a major advance in the nascent field of controlled fusion and may unlock new avenues of research on how nanomaterials can be designed from first principles to perform targeted functional roles in biological systems.
Thermodynamic energetics underlying genomic instability and whole-genome doubling in cancer
Authors: Remacle Francoise , Graeber Thomas G. , Levine R. D.
Published: July 2020

Significance

Genomic instability is characteristic of the majority of cancers. It includes changes of copy numbers of genes and chromosomes during diverse cell processes, such as genome replication. Genomic instability is a strong biomarker of poor prognosis. An analysis of DNA copy numbers in human tumors across different cancers reveals an instability in an energetic sense: The free energy of the distribution of gene loci copy numbers in each tumor is found to be a monotonically increasing and universal function of the mean chromosome ploidy in that tumor. This relates the biological (genomic instability) with the physicochemical stability criterion. The analysis also shows that it is energetically more favorable for genome doubling to occur from a not-already-fragmented genome.
Crop rotation mitigates impacts of corn rootworm resistance to transgenic Bt corn
Authors: Carrière Yves , Brown Zachary , Aglasan Serkan , Dutilleul Pierre , Carroll Matthew , Head Graham , Tabashnik Bruce E. , Jørgensen Peter Søgaard , Carroll Scott P.
Published: July 2020

Significance

The western corn rootworm, a major insect pest in the Midwestern United States, has evolved resistance to genetically engineered corn that produces insecticidal proteins derived from the bacterium
Bacillus thuringiensis
(Bt). To evaluate tactics for reducing the damage caused by resistant rootworms, we analyzed field data for 2011 to 2016 from Illinois, Iowa, and Minnesota. The frequency of corn fields with severe rootworm damage was reduced by rotating corn with other crops and by not planting the same type of Bt corn year after year in the same field. These results support the EPA’s recommendations to decrease the negative impacts of rootworm resistance to Bt corn by rotating corn with other crops and diversifying the type of Bt corn planted.
Specific thylakoid protein phosphorylations are prerequisites for overwintering of Norway spruce (
Picea abies
) photosynthesis
Authors: Grebe Steffen , Trotta Andrea , Bajwa Azfar Ali , Mancini Ilaria , Bag Pushan , Jansson Stefan , Tikkanen Mikko , Aro Eva-Mari
Published: July 2020

Significance

During overwintering, evergreen conifers of boreal forests must cope with freezing temperatures and high light intensities that often occur simultaneously and expose the photosynthetic apparatus to oxidative damage. To mitigate damage, conifers have developed a specific photoprotection mechanism, called sustained nonphotochemical quenching (sustained NPQ). Here we provide evidence for involvement of unique posttranslational phosphorylations of thylakoid proteins in sustained NPQ of spruce. The triply phosphorylated LHCB1 isoform and phospho-PSBS protein appear as prerequisites for development of sustained NPQ that safely dissipate absorbed light energy as heat. While the induction of Lhcb1 triple phosphorylation requires only freezing temperatures, the triggering of sustained NPQ is additionally dependent on light-induced PSBS phosphorylation, likely in concert with limited photoinhibition of photosystem II.
Automated detection of archaeological mounds using machine-learning classification of multisensor and multitemporal satellite data
Authors: Orengo Hector A. , Conesa Francesc C. , Garcia-Molsosa Arnau , Lobo Agustín , Green Adam S. , Madella Marco , Petrie Cameron A.
Published: July 2020

Significance

This paper illustrates the potential of machine learning-based classification of multisensor, multitemporal satellite data for the remote detection and mapping of archaeological mounded settlements in arid environments. Our research integrates multitemporal synthetic-aperture radar and multispectral bands to produce a highly accurate probability field of mound signatures. The results largely expand the known concentration of Indus settlements in the Cholistan Desert in Pakistan (
ca
. 3300 to 1500 BC), with the detection of hundreds of new sites deeper in the desert than previously suspected including several large-sized (>30 ha) urban centers. These distribution patterns have major implications regarding the influence of climate change and desertification in the collapse of the largest of the Old-World Bronze Age civilizations.
Co-option of the lineage-specificLAVAretrotransposon in the gibbon genome
Authors: Okhovat Mariam , Nevonen Kimberly A. , Davis Brett A. , Michener Pryce , Ward Samantha , Milhaven Mark , Harshman Lana , Sohota Ajuni , Fernandes Jason D. , Salama Sofie R. , O’Neill Rachel J. , Ahituv Nadav , Veeramah Krishna R. , Carbone Lucia
Published: July 2020

Significance

Transposable elements (TEs) are genetic units that can selfishly propagate in a host genome. Despite often being considered “junk,” TEs can occasionally acquire useful functions such as regulating expression of nearby host genes. Here, we study gibbons, small apes whose genome contains a unique TE calledLAVA(LINE-AluSz-VNTR-AluLIKE). We present evidence indicating that several LAVA insertions function as gene regulatory elements in the gibbon genome. Two of these insertions were also favored/preserved by natural selection, further indicating their functional importance for gibbons. Both of these LAVA elements were found inside genes that facilitate correct repair of DNA breaks, suggesting that LAVA’s incorporation in these genes may have influenced the regulation of biological processes that are crucial for maintaining genome integrity.
Inefficient V(D)J recombination underlies monogenic T cell receptor β expression
Authors: Wu Glendon S. , Bassing Craig H.
Published: July 2020

The assembly of T cell receptor (TCR) and immunoglobulin (Ig) genes by V(D)J recombination generates the antigen receptor (AgR) diversity that is vital for adaptive immunity. At most AgR loci, V(D)J recombination is regulated so that only one allele assembles a functional gene, ensuring that nearly every T and B cell expresses a single type, or specificity, of AgR. The genomic organizations of some AgR loci permit the assembly and expression of two distinct genes on each allele; however, this is prevented by undetermined mechanisms. We show that the poor qualities of recombination signal sequences (RSSs) flanking Vβ gene segments suppress the assembly and expression of two distinct TCRβ genes from a single allele. Our data demonstrate that an intrinsic genetic mechanism that stochastically limits Vβ recombination efficiency governs monogenic TCRβ expression, thereby restraining the expression of multiple AgRs on αβ T cells.
A sociophonetic investigation of Mexico City Spanish vowel reduction
Authors: Dabkowski Meghan Frances
Published: July 2020

This study is the first to use acoustic data to investigate linguistic and social factors conditioning phonetic vowel reduction in Mexico City Spanish. The acoustic analysis reveals that two complementary strategies are used for reduction: voice weakening and shortening. Voice weakening affects all vowels at relatively similar rates, and is favored by preceding voiceless consonants, following voiceless consonants, and following pauses, and is most frequent in post-tonic position. Shortening affects high vowels and /o/, and is favored by preceding and following voiceless consonants, and is most frequent in pre-tonic position and unstressed monosyllabic words. These results support an articulatory gestural overlap analysis, in which characteristics of articulatory timing and movement account for the variation.
Trajectories of change in Spanish and Portuguese in the Americas
Authors: Guy Gregory R.
Published: July 2020

This paper examines ways in which varieties of Spanish and Portuguese spoken in the Americas have diverged significantly from their peninsular sources, and from each other, in the half-millennium since colonization. Some of this divergence is a consequence of spontaneous innovations in the New World varieties (e.g., ‘zheismo’ and ‘sheismo’ in Platense Spanish; emergence of the new 1pl pronoun a gente in Brazilian Portuguese). Historically, a significant driver of change was language contact, with indigenous languages, and especially with African languages. A suite of linguistic characteristics shared by Caribbean Spanish and Brazilian Portuguese indicate that both varieties were affected by the irregular transmission of these languages to the African population transported to these locations in the time of slavery.
Clause typing and Quebec French -tu
Authors: Isac Daniela , Royer Justin
Published: July 2020

This paper focuses on the Quebec French particle -tu, which occurs in interrogatives, exclamatives and declaratives indicating surprise. We propose that -tu is the overt instantiation of a polarity (Pol) head that is neither negative nor positive and that -tu also carries an epistemic modality (Mod) feature that is keyed to an ignorant Speaker (S) and a knowledgeable Addressee (A).
The syntax of superlative phrases in Romance
Authors: Loccioni Nicoletta
Published: July 2020

In this paper, prenominal and postnominal superlatives in Romance are argued not to differ as a result of NP-movement (or lack thereof) to cross the adjective, but to result from two different derivations. In prenominal superlatives, the adjective is attracted to a high scope position in the DP-area of numerals where it can’t be bypassed by the NP. In postnominal superlatives, the superlative starts out as a predicate (a maximalizing relative clause over degrees) and it ends up postnominal (as any other relative clause in Romance).
The Symbolic Power of Place Names: The Case of the River Olše/Olza/Łolza in Northeastern Czechia
Authors: Mácha Přemysl
Published: July 2020

It is not uncommon for place names to become symbols of national identity. Once in that position, such names often play a significant symbolic role in national and local politics. It is less common, however, for actual place name usage to significantly contradict declared place name preferences such that for official purposes people prefer a name variant that they do not use themselves. This article describes an instance of just such cognitive dissonance in a trilingual region in the Czech-Polish borderlands. As will be shown, arguments over which variant to use in this region have been marked by ongoing debates about multilingualism in the linguistic landscape. The parallel usage of the names Olše/Olza/Łolza for the local river shows how important place names can be in articulating national belonging in spite of actual place name usage. The analysis is based on the results of a survey conducted on a large population sample. The questionnaire results are supplemented by interviews and secondary literature.
A centennial tribute to the Politzer Acoumeter
Authors: Young John Riddington , Mudry Albert
Published: July 2020

Objective

This year (2020) is the centenary of the death of the great otologist, Adam Politzer (1835–1920), the Founding Father of Otology. As a centennial tribute to him, the origin and development of his acoumeter is presented.

Method

historical study based exclusively on primary sources.

Results

Invented by Politzer in 1877, this small portable device to test auditory acuity was quickly accepted by colleagues and remained in popular use for more than 50 years. A detailed account of the Politzer Acoumeter is given together with a comparison with similar contemporary devices, which were also commercially available for clinical hearing testing.

Conclusion

There is no doubt that the Politzer Acoumeter had given the electrical audiometer a good run. For more than half a century, it had been widely used and had proved to be a very useful test of hearing.
Identification of patterns of tumour change measured on CBCT images in NSCLC patients during radiotherapy
Authors: Amugongo Lameck Mbangula , Osorio Eliana Vasquez , Green Andrew , Cobben David , van Herk Marcel , McWilliam Alan
Published: July 2020

In this study, we propose a novel approach to investigate changes in the visible tumour and surrounding tissues with the aim of identifying patterns of tumour change during radiotherapy (RT) without segmentation on the follow-up images. On-treatment cone-beam computed tomography (CBCT) images of 240 non-small cell lung cancer (NSCLC) patients who received 55 Gy of RT were included. CBCTs were automatically aligned onto planning computed tomography (planning CT) scan using a two-step rigid registration process. To explore density changes across the lung-tumour boundary, eight shells confined to the shape of the gross tumour volume (GTV) were created. The shells extended 6 mm inside and outside of the GTV border, and each shell is 1.5 mm thick. After applying intensity correction on CBCTs, the mean intensity was extracted from each shell across all CBCTs. Thereafter, linear fits were created, indicating density change over time in each shell during treatment. The slopes of all eight shells were clustered to explore patterns in the slopes that show how tumours change. Seven clusters were obtained, 97% of the patients were clustered into three groups. After visual inspection, we found that these clusters represented patients with little or no density change, progression and regression. For the three groups, the survival curves were not significantly different between the groups, p-value = 0.51. However, the results show that definite patterns of tumour change exist, suggesting that it may be possible to identify patterns of tumour changes from on-treatment CBCT images.
Precise real-time hysteretic force tracking of magnetorheological damper
Authors: Bai Xian-Xu ‘Frank’ , Li Cheng-Xi
Published: July 2020

Precise and real-time nonlinear hysteresis model of magnetorheological (MR) dampers is the premise to efficient control of MR semi-active systems. The influence of hysteresis models of MR damper on the control performance of the systems, employing a quarter-car MR semi-active suspension as an example, is studied thoroughly in this paper. Specifically, the hysteretic mechanical behavior of MR damper is precisely described, and the real-time feedforward control force tracking of MR damper is conducted, based on the resistor-capacitor (RC) operator-based hysteresis model. In addition, the dynamic model of a quarter-car MR semi-active suspension system is established, and a linear quadratic regulator controller and a Skyhook controller are correspondingly designed. The experimental tests, comparison, and analysis of MR damper utilizing the RC operator-based hysteresis model and the Bingham hysteresis model are carried out with the self-developed prototype of the quarter-car suspension system.
Preliminarily study of Saturn’s upper atmosphere density by observing Cassini plunging via China’s deep space station
Authors: Chen Lue , Ping Jin-Song , Liu Xiang , Wang Na , Cao Jian-Feng , Chen Guang-Ming , Wang Ming-Yuan , Li Wen-Xiao , Zhang Jian-Hui , Chen Yong-Qiang , Yue Shi-Lei , Han Song-Tao , Sun Jing
Published: July 2020

When the Cassini spacecraft finally plunged into the Saturnian atmosphere on 2017 September 15, China’s deep space telescope pointed to Saturn to observe Cassini and study the Saturnian upper neutral atmosphere. In this first Chinese Saturnian radio science experiment, X band Doppler velocity radio science data between the deep space telescope and the Cassini spacecraft were obtained. After removing Saturnian and solar gravity effects, Earth rotation effect, the remaining Saturnian atmosphere drag information was retrieved in the Cassini final plunge progress. Saturn’s upper neutral atmosphere mass density profile is approximately estimated based on atmosphere mass density derived principally by real orbit measurement data. Saturn’s upper neutral atmospheremass density from76 000 km to 1400 km is estimated fromthe orbit measurement data, the mass density results are about from 1.4 × 10−15 kg cm−3 to 2.5 × 10−14 kg cm−3.
Can active late-type stars contribute to the Galactic lithium abundance?
Authors: E. Kelly Darnell , Christian Damian J. , Mathioudakis Mihalis , Jevremović Darko
Published: July 2020

Lithium abundances in our Galaxy and especially 6Li abundances provide important constraints on our understanding of Big Bang Nucleosynthesis (BBNS), stellar evolution and the creation of light elements by cosmic rays in the ISM. 6Li has been detected in energetic solar events, one chromospherically active binary and several dwarf halo stars. Continuing our work on active late-type stars with high lithium abundances, we expand our study to consider if the flare origin of lithium created by spallation can contribute significantly to the Galactic abundance of lithium. We previously derived

6

Li

7

Li

=
0.030
±
0.010

for active K dwarf GJ 117 using VLT UVES observations. We find

6

Li

7

Li

ratios of 0.02 and 0.10 for two other stars in our sample, GJ 182 and EUVE J1145–55.3A, respectively. Considering that these later type, active stars have significant flare rates and stellar winds, we have estimated the contribution of these stars to the Galactic lithium abundance. Given that K and M stars comprise over 84% of our Galaxy and that many of these can have significant stellar winds, we conclude that spallation in stellar flares can contribute 1% and up to 5% of the Galactic lithium abundance.
New CCD photometric investigation of high amplitude δ Scuti star V2455 Cyg
Authors: Ostadnezhad Setareh , Forozani Ghasem , Ghanaatian Mohammad
Published: July 2020

New V-band CCD observations of variable star V2455 Cyg were performed during two nights in September 2017. According to all times of maximum light and new maxima, the O − C curve was analyzed. The period changes of V2455 Cyg were investigated and the rate of increasing period was obtained to be (1/P) dP/dt = 1.99 × 10−7 yr−1. Frequency analysis indicated that V2455 Cyg pulsates with the radial p mode and the fundamental frequency is 10.61574 d−1. Physical parameters of V2455 Cyg at mean temperature were determined (e.g., R = 2.52 R
⊙ and M = 1.92 M
⊙). The position of this star in the H-R diagram confirms that V2455 Cyg is a high amplitude δ Scuti star.
Local galaxies with compact cores as the possible descendants of massive compact quiescent galaxies at high redshift
Authors: Gao Ying , Fan Lu-Lu
Published: July 2020

In order to test a possible evolutionary scenario of high-z compact quiescent galaxies (cQGs) that they can survive as local compact cores embedded in local massive galaxies with different morphology classes, we explore the star formation histories of local compact cores according to their spectral analysis. We build a sample of 182 massive galaxies with compact cores (M
*, core > 1010.6
M
⊙) at 0.02 ≤ z ≤ 0.06 from SDSS DR7 spectroscopic catalogue. The STARLIGHT package is used to analyze the median stacked spectra and derive the stellar ages and metallicities. Our main results show that local compact cores have the average age of about 12.1 ± 0.6 Gyr, indicating their early formation at z > 3, which is consistent with the formation redshifts of cQGs at 1 < z < 3. Together with previous studies, our result that local compact cores have similar formation redshifts as those of high-z cQGs, supports that local massive galaxies with compact cores are possible descendants of cQGs. Morphological study of local galaxies with compact cores suggests that there would be multiple possible evolutionary paths for high-z cQGs: most of them (> 80%) will evolve into local massive early-type galaxies according to dry minor merger, while some of them (∼ 15%) will build substantial stellar/gas discs according to the late-time gas accretion and sustaining star formation, and finally grow up into spiral galaxies.
Analysis of the X-ray emission from OB stars III: low-resolution spectra of OB stars
Authors: Ryspaeva Elizaveta , Kholtygin Alexander
Published: July 2020

This paper is the third in our series of papers devoted to the investigation of X-ray emission from OB stars. In our two previous papers, we study the high-resolutionX-ray spectra of 32 O stars and 25 B stars to investigate the correlations between the properties of X-ray emission and stellar parameters.We checked if the X-ray hardness and post-shock plasma temperature grow with increasing stellar magnetic field, mass loss rate and terminal wind velocity. Our previous analysis of high-resolution spectra showed that the correlations are weak or even absent. In the present paper, we analyzed low-resolution X-ray spectra, using model-independent X-ray hardness values for checking the above mentioned dependencies. We establish that X-ray luminosities L
X weakly depend on the stellar magnetic field. At the same time, L
X ∝ Ṁ
0.5 and

L
X

∝

E

kin

0.5

, where ṁ is the mass loss rate and E
kin is the kinetic energy of the wind. The X-ray luminosities decrease with growing magnetic confinement parameter η. We also argue that there is an additional (probably non-thermal) component contributed to the stellar X-ray emission.
Alternative kind of hydrogen atoms as a possible explanation for the latest puzzling observation of the 21 cm radio line from the early Universe
Authors: Oks Eugene
Published: July 2020

There is a puzzling astrophysical result concerning the latest observation of the absorption profile of the redshifted radio line 21 cm from the early Universe (as described in Bowman et al.). The amplitude of the profile was more than a factor of two greater than the largest predictions. This could mean that the primordial hydrogen gas was much cooler than expected. Some explanations in the literature suggested a possible cooling of baryons either by unspecified dark matter particles or by some exotic dark matter particles with a charge a million times smaller than the electron charge. Other explanations required an additional radio background. In the present paper, we entertain a possible different explanation for the above puzzling observational result: the explanation is based on the alternative kind of hydrogen atoms (AKHA), whose existence was previously demonstrated theoretically, as well as by the analysis of atomic experiments. Namely, the AKHA are expected to decouple from the cosmic microwave background (CMB) much earlier (in the course of the Universe expansion) than usual hydrogen atoms, so that the AKHA temperature is significantly lower than that of usual hydrogen atoms. This seems to lower the excitation (spin) temperature of the hyperfine doublet (responsible for the 21 cm line) sufficiently enough for explaining the above puzzling observational result. This possible explanation appears to be more specific and natural than the previous possible explanations. Further observational studies of the redshifted 21 cm radio line from the early Universe could help to verify which explanation is the most relevant.
Evaluation of National Community Empowerment Program Implementation in Rumbia Village, Boalemo Regency
Authors: Naway Forry A. , Elyanda Saliko Deyvi
Published: July 2020

The purpose of this research is to discover the mechanism, success, and sustainability of PNPM Mandiri implementation in Rumbia Village, Botumoito Subdistrict, Boalemo Regency. The qualitative descriptive method was used in this research that the data were collected from observation, questionnaire, and documentation. The results reveal that: 1) the mechanism of PNPM Mandiri implementation achieves percentage of 71.64% in a means that the mechanism has been done as the procedure; however, there is a lack of person in charge of the program and the facilitator that is unavailable all the time to follow up people’s complaint. 2) the success of PNPM Mandiri implementation reaches 72.07% which means that this program is unsuccessfully implemented towards society’s welfare although local government serves the poor people through this program. 3) the sustainability of PNPM Mandiri implementation arrives 74,11% which indicates that the implementation of this program has been right on target to accelerate poverty reduction. Nevertheless, it is only applied to farming and micro business as the program benefit recipients. People’s role main doer of the policy is very crucial in supporting and guaranteeing the success and the sustainability of this program policy and implementation.
The Potential of Gorontalo Province as Global Geopark
Authors: Andri Kurniawan Idham , Sugawara Hisanari , Sakakibara Masayuki , Arifin Indriati Yayu , Suly Eraku Sunarty
Published: July 2020

The extraordinary of geodiversity together with the ecological resources and profound cultural heritages provide a valuable basic of geotourism and geopark development. The purpose of this paper is to show the possibilities of geological interpretation, geotourism, and cultural heritages in the area of Gorontalo province that would become valuable basic to promote geopark. The collected data was carried out by field observation and literature review. The results of this study indicate that the Gorontalo has the potential of geopark and would serve as tourist destination in Sulawesi by applying the concept of Geotourism which accentuate natural side, by optimizing the management of destination attractions, facilities and services, and accessibilities.
Maintenance Building Strategies in a private University in Jakarta
Authors: Triwijayanty F , Sakti W I
Published: July 2020

After the construction of the building has been completed, and the operation of the building begins, a building management and maintenance is needed so that the building is maintained and can still be used properly. Therefore a management body is needed to treat and build the building properly. Management of maintenance and maintenance of office buildings and personal safety of everyone in the building, and account for the age of the building’s plans. In this study, it was proven that things were agreed on the satisfaction of building users with the quality of care carried out by building managers with the questionnaire survey method, then performed an examination of the achievements of the things that were most significant, so that building user satisfaction and strategy would be obtained. building maintenance. Related to matters relating to building user satisfaction are divided into several categories that include, reliability, tangible, assurance, responsiveness, empathy, maintenance activities, and management activity. This research was conducted by converting directly to the field, interviewing, and distributing questionnaires given to building users who use the building in their daily lives. The analysis process carried out in this study is a mixed method (qualitative and quantitative) to be able to provide an accurate and systematic description of a situation and the relationships that are carried out between countries discussed. From all the collected questionnaires analyzed using the method of relative importance index (RII) through the validity and reliability test the questionnaire was analyzed with the help of statistic program (computer) to determine the level of validity variables. All data obtained from observations, interviews, and questionnaires will be used to look for service quality factors in building maintenance. The results of this study indicate the fact of the 5 highest factors in the quality of building maintenance. Of the five factors, the aspect of empathy is the highest aspect in the quality of care of this building. While aspects of maintenance activities and tangible are aspects that least meet the expectations of building users..
Utilization of roof garden installation to reduce rainwater runoff in urban residential
Authors: Lestari Endah , Sofyan Muhammad , Pamuji Buddy
Published: July 2020

The role of natural resources is very important in fulfilling human life dan must be managed in non-destructive ways. The discoveries of technology utilized, and managed natural resources is very important and more beneficial in the future. The water resources are one of natural resources can be managed. The rainwater runoff caused a significant problem for many cities due to lack of catchment area. Roof garden becoming potential solutions in controlling the volume of rainwater runoff. Several studies, rooftop garden have not been fully implemented in developing countries due to high construction and long-term maintenance costs. The roof shape can affect to the construction and installation of a roof garden. The research is a roof garden type that can be adapted to the most used roof on the area. The method is to design, build and install the roof garden on sloping shape roofs type. By watering the roof garden, we get the result of minimum runoff according to soil condition. The water maximum infiltrated to soil and the percentage of runoff that occurs is 22% from total water. The conclusion of this research is the roof garden influences the surface runoff; this cause positive impact on reducing rainwater runoff.
Study Of Factors Affecting Productivity Of Pouring Concrete Using Portable Concrete Pump In Construction Project X
Authors: Sutandi Arianti , Wednesday Grand
Published: July 2020

Portable concrete pump is a tool used to pump concrete towards casting locations especially when the locations could not be reach by truck mixers. By using portable concrete pumps, concreting process can be finished quicker. This study begin with elaborating information about factors affecting the concreting process such as equipment and machinery for pumping, standard procedures for placing concrete and other requirements. The relation between productivity of portable concrete pumps and horizontal range, as well as the height of the casting location, is derived from project observation and data collection. Further calculation and analysis shows the regression equation for portable concrete pump productivity is obtained as Y = 1.0546 – 0.00351 X1–0.00181X2 with X1 is floor height and X2 is horizontal range. The difference in productivity during productive time and total time that is affected by delays is 0, 044 m3/min or the effect of delay time to concreting productivity is 8.7% compare to productive time.
Risk Analysis of Toll Road Construction Project By Using Soft System Methodology (ssm) A Case Study Of Sumatera Trans Toll Road Section 1 (Terbanggi Besar – Menggala)
Authors: Enriko Tosulpa M. , Najid
Published: July 2020

Toll Constructing a toll road project always deals with various technical and non-technical problems. Those problems are considered as the risk of construction projects. These risks will definitely affect the project function and result in losses both in terms of cost, quality, and time, which determine the success of a project. Therefore, the purpose of this research was to identify and to analyze the risks using qualitative-quantitative research with the Soft System Methodology (SSM) on Sumatra Trans Toll Road Project Section I in Bakauheni - Kalianda (Sta. 00 + 400 - Sta. 20 + 000). Collecting data, this research used purpose sampling techniques from six respondents. In addition, data analysis methods used in this study are Probability Risk Test, Consequences Risk Test, and Soft System Methodology (SSM).
Analysis of the Potential of Crust Formation and Corrosiveness in the Way Rilau PDAM Lampung Distribution Network Using the Langelier Saturation Index Method
Authors: Anwar  , Sembiring Alexander , Purna Irawan Agustinus
Published: July 2020

Crust formation is a complex problem and always occurs in piping systems, both in oil piping systems, industry, and water distribution. When the crust is formed on the pipe, it will cause the pipe diameter to shrink and inhibit the flow of fluid in the pipe system. If the pipe has a problem, its temperature and pressure will be higher, increasing the possibility of the pipe to break and get damaged. This study aims to determine the formation of PDAM water pipe scale in Bandar Lampung with the Langelier Saturation Index Method. Based on the LSI calculation results, a value of -0.9 is obtained. This indicates that the corrosion rate is high, but there is no visible potential for scale formation. Formation of corrosion in the pipe can cause the pipe wall to thin out thereby increasing the potential for pipe leakage. Due to this, the checking of the pipes is necessary. Potential leakage of pipes will disrupt the distribution system and reduce service levels of PDAM Bandar Lampung City. Increasing the value of LSI in water can increase the pH of each water source. Increasing the pH will cause an increase in the value of LSI so that it is in neutral conditions and the level of corrosivity decreases. In addition, the flow velocity of water needs to be maintained with a minimum speed of 0.3 m/s to prevent the formation of scale on the pipes.
Image clustering using genetic algorithm with tournament selection and uniform crossover
Authors: Valerian Gevin , Sutrisno Tri , Erny Herwindiati Dyah
Published: July 2020

This study aims to test genetic algorithm with tournament selection and uniform crossover for clustering complicated images. Genetic algorithm can be used for searching the optimum centroid for clustering images. Images that used in this study is beach images, city images, traditional market images, and garden images. Based on the research result genetic algorithm with tournament selection and uniform crossover can be used for clustering images but there is some outlier in formed cluster. Based on trial the best parameters for image clustering with genetic algorithm with tournament selection and uniform crossover is population=200, iteration=200, and number of cluster=2. Fitness value on genetic algorithm is increase when population and iteration value are higher. The result of this study can be used as a reference in the development of images clustering.
Project Manager Classification for Design and Build Construction of State Buildings
Authors: Kusumawati Jujuk , Mochtar Krishna , Najid
Published: July 2020

This study aims to obtain an appropriate classification of Project Manager (PM) experts for the Construction Design and Build of State Buildings. Where the criteria are taken from the tender for the Construction Design and Build project of the State Building using multi-criteria analysis, by conducting an expert interview, namely to the Construction Management Consultant and Committing Officer (PPK). Based on research using indicators of education, experience, certification, behavior and culture. the results obtained are appropriate Project Manager qualification criteria for the Design and Construction of State Buildings.
Identification of Design And Build Risks in School Building Construction Projects in Central Jakarta
Authors: Suharyanto Andreas , Simanjuntak Manlian Ronald A.
Published: July 2020

The increase in school building construction projects using design and build methods is the background of this research. Construction projects with design and build also have the same risks as school building construction projects with other methods. This research has the formulation of the problem in the form of how the character of school building construction projects in Central Jakarta and what are the risks of design and build in school building construction projects in Central Jakarta. The risks obtained are used as data to make improvements or prevention in the implementation of construction activities. Based on the results of the study there are 23 risk variables which are divided into 2 risk factors, namely planning factors and construction factors. The results of this study can be used as a reference in risk mitigation planning.
Flexible Pavement Mechanistic Response to the 2017 Indonesian Road Pavement Manual with Cement-Treated Base (CTB)
Authors: Noor Tajudin Anissa , Grady Akira Winarko Clement
Published: July 2020

The empirical method, a method developed from experiments or experience, has historically been the usual planning method used in Indonesia for designing flexible pavement thickness. The newest pavement design manual in Indonesia, Bina Marga 04/SE/Db/2017 has introduced the mechanistic method, based on pavement responses such as strain, deflection, and stress. Research was conducted to evaluate the design chart in the manual with KENPAVE program assistance in order to know the mechanistic response for the cement-treated base (CTB) foundation. The loadings for 100%, 150%, and 200% are used to know pavement response to loading variations. Vertical and horizontal strain were reviewed as mechanistic responses. Vertical strain was used to analyse rutting, and horizontal strain was used to analyse fatigue. The research shows that as the California Bearing Ratio (CBR) value increases, the smaller the vertical strain value becomes. However, this was not the case with horizontal strain where the CBR value did not seem to influence the horizontal strain value. The added loading will increase pressure on the pavement so that compressive and tensile strains on the pavement will be higher.
Passenger satisfaction assessment on the flight performance of Balikpapan-Yogyakarta route flights (Case study: Sultan Aji Muhammad Sulaiman Sepinggan International Airport, Balikpapan)
Authors: Yanti  , Enriko T. M. , Baidowi  , Pius  , Suryo Putranto Leksmono
Published: July 2020

Sultan Aji Muhammad Sulaiman International Airport, Sepinggan, Balikpapan or abbreviated to SAMS is the largest airport in East Kalimantan Province. it is necessary to conduct a deeper study of the airline services performance on passenger satisfaction. From this study, it is expected that the service performance information will be obtained including ticket information, service officers in the check-in room, service officers in the waiting room, services on the aircraft and others to provide input in service improvement. The research reported in this paper is investigating passenger satisfaction on flight routes from Balikpapan to Yogyakarta. The study was conducted by observation, interview and questionnaire distribution. The research plan is carried out from the beginning of January 2020 to June 2020 starting from preparation, investigation of passenger satisfaction, data analysis to research results. Respondents targets include Lion Air passengers, Garuda Indonesia passengers, Batik Air passengers, Sriwijaya Air Passengers and Citilink passengers.
Analysis of value engineering application at the design stage of a deep excavation system
Authors: Benjamin  , Johan J
Published: July 2020

This paper introduces a method of value engineering analysis by calculating the value coefficient of the substructure work in an office building project. Value coefficient is obtained by dividing the performance coefficient with cost coefficient, whose result shows that the retaining wall system is the main object to be developed. The retaining wall system used in the initial design is soldier pile consisting of rows of 80 cm diameter bored pile with a one-meter center to center spacing, which in each gap between two adjacent bored piles, a 40 cm diameter bentonite pile was constructed. The construction cost of the substructure generated from the initial design is Rp. 35,554,793,500.00. After implementing VE analysis, the VE team chose spun piles with 60 cm diameter (without bentonite piles) with 70 cm center to center spacing as a substitute for the initial design. The assessment performed by the VE team about the performance of the alternative indicates that there is 20.6% increase of performance compared to initial design and cost savings of 17.75%, resulting in a value coefficient of 1.22, this result is 47% higher than the initial design has, which is 0.83.
Innovation of quality improvement to reduce weld defect through six sigma methods in the fabrication process of power plant component
Authors: Puspa Wirani Ayu , Santoso Saroso Dana , Hardi Purba Humiras
Published: July 2020

This study aims to improve the quality of boiler through six sigma methods. Quality of boiler in the thermal power plant should be maintained with a good performance in order to assure that power plant can operate normally. DMAIC principle, defining, measuring, analyzing, improving, and controlling processes is implemented in this research. The reseach finding that the average rejection rate that exceeds the target rejection rate are Radiography Test (RT) of welding tube- tube, header-header, and header-end caps. Porosity is a type of weld defect that often occurs, around 36%. Project team concluded three critical that influence the output variables the most. These four variables are welder skill, welding fluxes gas, and welding condition. By implemented improvement of six sigma methods, sigma value increased from 4.1 become 5.
Kinematics analyses for robot motion
Authors: Siregar Wandro , Siagian Parulian , Rong-Shine Lin , Napitupulu Richard AM. , Tampubolon Miduk , Simanjuntak Sutan LMH
Published: July 2020

This project is a part of the analysis which aims to find solutions to the kinematics problem that exists in the movement of the robot arm. In order to control the robot manipulator as desired, so it is important to consider kinematics models in the design of control algorithms. Which in this report presents a mathematical model and kinematics parameter for the robot kinematics. The solution of the forward kinematics based on the matrix transformation method are given and the results are obtained using Matlab software.
Lead-free solder SAC 305 Volume Reduction and Cold Slump after Stencil Printing Process
Authors: Rusdi M. S. , Abdullah M. Z. , Abdul Aziz M. S. , Abdullah M. K. , Ishak M.H.H , Rethinasamy P.
Published: July 2020

The present work studied on the volume reduction and cold slump effect for lead-free solder. The solder paste SAC305 type 3 was used to study the effect of waiting time on the solder volume and height at room temperature. DEK 265 was used for the printing purpose and KOH YOUNG Aspire 2 was fully utilized for the measurement of solder volume and solder height. The experiment was conducted for 120 minutes with 15 minutes gap between the measurements. Three types of components size (0603, SOT and Tantalum-D) was compared to see the effect on different components sizes. Solder paste volume and height shows a reduction from its initial values after 120 minutes for all three components size. For solder volume, biggest size component, Tantalum-D give lowest volume reduction at 3.55% compared to 0603 (3.68%) and SOT (3.76%). Meanwhile, solder height gives different results where Tantalum-D have the highest height reduction at 2.8% while SOT and 0603 have lower height reduction at 2.17% and 1.84% respectively.