bluuebunny/crossref_metadata_2025 huggingface dataset:
On percolation and ‐hardness
Authors: Bennett Huck , Reichman Daniel , Shinkar Igor
Published: March 2018

The edge‐percolation and vertex‐percolation random graph models start with an arbitrary graph G, and randomly delete edges or vertices of G with some fixed probability. We study the computational complexity of problems whose inputs are obtained by applying percolation to worst‐case instances. Specifically, we show that a number of classical
‐hard problems on graphs remain essentially as hard on percolated instances as they are in the worst‐case (assuming ). We also prove hardness results for other
‐hard problems such as Constraint Satisfaction Problems and Subset‐Sum, with suitable definitions of random deletions. Along the way, we establish that for any given graph G the independence number and the chromatic number are robust to percolation in the following sense. Given a graph G, let be the graph obtained by randomly deleting edges of G with some probability . We show that if is small, then remains small with probability at least 0.99. Similarly, we show that if is large, then remains large with probability at least 0.99. We believe these results are of independent interest.
Property Investigations of Low‐Grade Vanadium‐Titanium Magnetite Pellets with Different MgO Contents
Authors: Gao Zixian , Cheng Gongjin , Xue Xiangxin , Yang He , Duan Peining
Published: March 2018

Properties of low‐grade vanadium‐titanium magnetite pellets (LGVTMP) with different MgO contents are investigated. Since MgO can ameliorate the properties of acid pellets, pure MgO reagent is added to LGVTMP as a MgO additive in this paper. The experimental results show that the compressive strength (CS) of different MgO‐bearing LGVTMP has a decreasing trend with the increase of MgO content, but all of the pellets are above 2000 N/pellet and meet the requirement of the blast furnace production when the roasting temperature is 1250 °C. And the mechanism of MgO on reduction swelling (RS) is different from hematite and magnetite. At 900 °C, the RS of LGVTMP mainly occurs in the reduction process of Fe2O3 → Fe3O4 → FeO and Fe2TiO5 → Fe2TiO4 under the atmosphere of 70% N2 and 30% CO. Moreover, reduction swelling index (RSI) of LGVTMP increases first and then decreases with the increase of MgO content, and 1.25% MgO pellets have worse RSI of 17.9%. In addition, adding MgO can improve the reducibility of LGVTMP due to the decrease of Fe2TiO5 content.
Adopted Individuals’ Views on the Utility and Value of Expanded Carrier Screening
Authors: Spencer Sara , Ewing Sarah , Calcagno Kathryn , O'Neill Suzanne
Published: March 2018

Adoptees may not have family medical history and ethnicity information. Carrier screening assesses reproductive risk. Expanded carrier screening (ECS) screens for many genetic conditions regardless of a patient's knowledge of family history and ethnicity. This study aimed to better understand the opinions and attitudes of adopted individuals on the use of ECS in determining a patient's reproductive genetic risks. Specifically, the study assessed how adopted individuals feel that results of ECS may be useful to them and whether adoptees feel that meeting with a genetics professional in the process of undergoing ECS would be useful. Adult adoptees (N = 124) were recruited online. Their opinions on ECS were explored. The majority reported they had never been offered carrier screening (92%). The majority of adoptees wanted ECS (76%). Neither the amount of contact with biological relatives nor having medical knowledge about biological relatives was significantly associated with adoptees’ desire to pursue ECS. There was a significant positive correlation between adoptees of higher education levels and the amount they would pay for ECS (p = 0.004). The majority of participants (95%) indicated a genetics professional would be helpful when undergoing ECS. The findings suggest this population may want ECS and support from genetics healthcare professionals. Advocacy for genetic counseling and testing for adoptees appears justifiable.
Adolescent psychopathology in times of change: Introduction to the special issue
Authors: Stattin Håkan , Seiffge‐Krenke Inge , Hendry Leo , Kloep Marion , Beyers Wim
Published: March 2018

The aim of this special issue is to understand better the many changes in adolescent psychopathology have taken place over the last decades. The factors associated with adjustment problems and psychopathology in adolescence today are not necessarily the same as the factors that predicted problems and psychopathology in the past. But the basic strategies for connecting negative experiences with adolescent psychopathology remain as important today as they were for understanding adolescent psychopathology decades ago. This is well exemplified in the studies included in this Special Issue. What all this studies have in common is that parenting and the family environment are assumed to play a key role in adolescents' adjustment and psychopathology. Finally, given that all papers in this special issue are based on conference presentations at the 15th Biennial Conference of the European Association for Research on Adolescence (EARA), some more information on that conference in included in this introduction.
An Online Cross-Sectional Comparison of Women With Symptoms of Persistent Genital Arousal, Painful Persistent Genital Arousal, and Chronic Vulvar Pain
Authors: Jackowich Robyn A. , Pink Leah , Gordon Allan , Poirier Évéline , Pukall Caroline F.
Published: March 2018

Background

Persistent genital arousal disorder (PGAD) is an understudied condition characterized by unwanted physiologic genital arousal in the absence of subjective sexual arousal. Markos and Dinsmore (Int J STD AIDS 2013;24:852–858) theorized that PGAD shares a number of similarities with vulvodynia (unexplained chronic vulvar pain [CVP]), including symptom characteristics and comorbidities.

Aim

To compare medical histories, symptom characteristics, pain characteristics, and daily functioning among women with persistent genital pain (PGA) (n = 42), painful PGA (n = 37), and CVP (n = 42) symptoms.

Methods

An online cross-sectional survey was conducted from October 2015 through April 2016.

Outcomes

Self-report measures of symptoms, diagnosed medical conditions, pain characteristics (McGill Pain Questionnaire), catastrophizing (Pain Catastrophizing Scale), and daily functioning (Functional Status Questionnaire) were collected.

Results

All 3 groups reported similar medical diagnoses and high frequencies of other chronic pelvic pain conditions. Women in all 3 groups reported comparable ages at symptom onset and timing of symptom expression (ie, constant vs intermittent). Women in the 2 PGA groups reported significantly greater feelings of helplessness than women in the CVP group. Women in the painful PGA and CVP groups endorsed significantly more sensory terms to describe their symptoms compared with women in the PGA group, whereas women in the painful PGA group reported significantly more affective terms to describe their symptoms compared with women in the CVP group. Women in the 2 PGA groups reported that their symptoms interfered significantly with most areas of daily functioning.

Clinical Implications

Given the similarities between PGA and CVP symptoms, women with PGA may benefit from similar assessment, treatment, and research approaches.

Strengths and Limitations

Limitations of the present study include its sole use of self-report measures; the presence of PGA or CVP symptoms was not confirmed by clinical assessment. However, the anonymous design of the online survey could have resulted in a larger and more diverse sample.

Conclusion

The results of this study provide some initial support for the conceptualization of persistent genital arousal as a subtype of genital paresthesias/discomfort. These results also further highlight the negative impact that PGA symptoms have on many domains of daily living and the need for further research on this distressing condition.
Psychometric Properties of the Orgasm Rating Scale in Context of Sexual Relationship in a Spanish Sample
Authors: Arcos-Romero Ana Isabel , Moyano Nieves , Sierra Juan Carlos
Published: March 2018

Background

The Orgasm Rating Scale (ORS) is one of the few self-reported measures that evaluates the multidimensional subjective experience of orgasm.

Aim

The objective of this study was to examine the psychometric properties of the ORS in context of sex-with-partner in a Spanish sample.

Methods

We examined a sample of 842 adults from the general Spanish population (310 men, 532 women; mean age = 27.12 years, SD = 9.8). The sample was randomly divided into two, with a balanced proportion of men and women between each sub-sample. Sub-sample 1 consisted of 100 men and 200 women (33.3% and 66.6%) with a mean age of 27.77 years (SD = 10.05). Sub-sample 2 consisted of 210 men and 332 women (38.7% and 61.3%) with a mean age of 26.77 years (SD = 9.65). The ORS, together with the Sexual Opinion Survey-6 and the Massachusetts General Hospital-Sexual Functioning Questionnaire, was administered online. The survey included a consent form, in which confidentiality and anonymity were guaranteed.

Outcomes

Based on exploratory factor analysis, we obtained a reduced 25-item version of the ORS, distributed along 4 dimensions (affective, sensory, intimacy, and rewards).

Results

We performed both exploratory factor analysis and confirmatory factor analysis. The Spanish version of the ORS had adequate values of reliability that ranged from .78–.93. The 4 factors explained 59.78% of the variance. The factor structure was invariant across gender at a configural level. Scores from the ORS positively correlated with erotophilia and sexual satisfaction. The scale was useful to differentiate between individuals with orgasmic difficulties and individuals with no difficulties. We found that individuals with orgasmic difficulties showed a lower intensity in the affective, intimacy, and sensorial manifestations of orgasm.

Clinical Translation

This version of the ORS could provide an optimum measure for the clinical assessment to identify individuals with difficulties in their orgasmic capacity, thus, it could be used as screening device for orgasmic dysfunction.

Conclusions

The ORS is an appropriate measure for its use for both research and clinical purposes. As limitations, quota sampling implies that the extent to which the results can be generalized is modest. Measurement invariance did not reach the level of weak invariance, and it was not tested across sexual orientation because most individuals identified themselves as heterosexual. The ORS is a multidimensional measure of the subjective experience of orgasm which has adequate psychometric properties; it is a reliable and valid scale.
Correction: Author Correction: Attenuation of RNA polymerase II pausing mitigates BRCA1-associated R-loop accumulation and tumorigenesis
Authors: Zhang Xiaowen , Chiang Huai-Chin , Wang Yao , Zhang Chi , Smith Sabrina , Zhao Xiayan , Nair Sreejith J. , Michalek Joel , Jatoi Ismail , Lautner Meeghan , Oliver Boyce , Wang Howard , Petit Anna , Soler Teresa , Brunet Joan , Mateo Francesca , Angel Pujana Miguel , Poggi Elizabeth , Chaldekas Krysta , Isaacs Claudine , Peshkin Beth N. , Ochoa Oscar , Chedin Frederic , Theoharis Constantine , Sun Lu-Zhe , Curiel Tyler J. , Elledge Richard , Jin Victor X. , Hu Yanfen , Li Rong
Published: March 2018

Nature Communications 8: Article number: 15908 (2017); Published 26 June 2017; Updated 30 March 2018 The original version of this Article omitted the following from the Acknowledgements: ‘The work was also supported by a grant to Y.H. from the Cancer Prevention Research Institute of Texas CPRIT RP170126.
Microfluidic 68Ga-labeling: a proof of principle study
Authors: Pfaff Sarah , Philippe Cecile , Pichler Verena , Hacker Marcus , Mitterhauser Markus , Wadsak Wolfgang
Published: March 2018

The 68Ga-labeling of three representative precursors (DOTA-NOC, NODAGA-RGD(yk) and PSMA-11) was performed applying a microfluidic continuous flow device.
Dynamic optimal power flow model incorporating interval uncertainty applied to distribution network
Authors: Chen Pengwei , Xiao Xiangning , Wang Xuhui
Published: March 2018

Dynamic optimal power flow (DOPF) in active distribution networks generally relies on a perfect forecasting of uncertainties such as intermittent distributed generations and time‐varying loads, which is generally difficult to achieve in practise. To make DOPF possess the ability to deal with uncertainties, especially for the satisfaction of operating constraints in an uncertain environment, an interval DOPF (I‐DOPF) model is derived in this study, by using affine arithmetic and interval Taylor expansion. To solve the I‐DOPF problem efficiently, the solving method based on successive linear approximation (SLA) and distributed optimisation strategy is further discussed. The proposed I‐DOPF model and its solving method are subsequently applied to a modified IEEE 33‐bus network and a real 113‐bus distribution network. The simulation results demonstrate that the I‐DOPF model has a good performance on boundary constraint satisfaction under uncertainties; the SLA‐based solving method can be well integrated with distributed optimisation to meet the practical requirements of data exchange in large‐scale active distribution networks.
Approach for GPS precise time transfer using an augmentation information and zero‐differenced PPP model
Authors: Tu Rui , Zhang Pengfei , Zhang Rui , Liu Jinhai , Lu Xiaochun
Published: March 2018

This study proposes an approach for global positioning system (GPS) precise time transfer using the augmentation information and zero‐differenced precise point positioning (PPP) models. The augmentation information can be real‐time generated by constraining the coordinates of the reference stations, it is the difference between the observed distance and the real distance from the satellite to the receiver after considering the modelling errors. As the augmentation information contains the ionosphere delay, troposphere delay, receiver clock, phase ambiguities, ephemeris residuals and the other un‐modelling errors, thus some common errors are eliminated and/or reduced after used the augmentation information, then the zero‐differenced PPP model can be used for data solution and precise time transfer service. Two pairs of datasets were used to validate the feasibility and effectiveness of the proposed approach. The results show that the accuracy and stability of time transfer are greatly improved by the new approach, especially for the zero baseline. Compared with the traditional PPP time transfer approach, which relies on the precise ephemeris, the new approach used the augmentation correction which contains the ephemeris residuals, thus it can be operated by both precise ephemeris and broadcast ephemeris, and is hence more effective for real‐time operation.
An investigation of spatial arrangement, form, and structural system of traditional houses in Pedawa indigenous village - Bali
Authors: Prajnawrdhi Tri Anggraini
Published: March 2018

The Balinese traditional architecture has become valuable inheritance from the ancestor which still exists and is preserved until now, it is a symbol of local culture and reflects its characteristics. However, overpopulation has become one of the major challenges for Bali to cope with, and the impact of this phenomena significantly transform the traditional houses both its use and its form. The uniqueness of the architecture of Pedawa village has not yet been investigated in previous research. This paper aims to explore the detail of spatial arrangement, form, and structural system of the traditional houses, and its conservational effort. The case study method is employed for this research. Both primary and secondary data from interview, site observation, and literature data are analysed with qualitative analysis. The results show that the locals make every effort to sustain their values. The unique spatial arrangement, form, and structural system of the houses are strongly influenced by local customs; lifestyles; beliefs, and the environment. Hence, challenges are due to lack of understanding about conservation by the locals of their values and lack of natural resources; lifestyles; beliefs sand the environment.
Dynamic Response of RC Cantilever Beam by Equivalent Single Degree of Freedom Method on Elastic Analysis – A Review on Transformation Factors and Dynamic Magnification Factors
Authors: Tudjono Sri , Kusumaningrum Patria
Published: March 2018

The response of multi-degree-of-freedom (MDOF) structure can be correlated to the response of an equivalent single-degree-of-freedom (SDOF) system, implying that the response is controlled by a single, unchanged mode shape. This equivalent SDOF method is eminent as an approximate method of dynamic analysis. In this study, equivalent SDOF method analysis is carried out on RC cantilever beam subjected to dynamic blast loading to review the transformation factors (TFs) provided by TM5-1300 code.
Modelling and analysis the effect of unbalanced moment directions on behaviour of edge column-slab connections
Authors: Sudarsana I Ketut , Wiryadi I Gede Gegiranang , Susila Gede Adi
Published: March 2018

This research investigates the effect of unbalanced moment directions on the behaviour of edge column slab connections using a finite element analysis. The analyses were done on subassembly edge column slab connections that were designed according to Indonesian Concrete Standard (SNI 2847:2013). Three unbalanced moment directions were considered namely perpendicular, parallel and inclined 45° to the slab free edge. The concrete damage plasticity (CDP) and truss elements in Abaqus were utilized to model and analyse the behaviour of concrete and reinforcement bars, respectively. The modelling techniques were first validated using an experimental result available in the literature. There are five parameters in the CDP model need to be validated to get convergent results with the experimental data. Using the CDP validated parameters, then seven specimen models were analysed under combined shear force and an unbalanced moment in three directions. The ratio of M/V was kept constant of 0.3. The results show that the punching failure capacity of connections having an unbalanced moment inclined 45° is smaller than that of an unbalanced moment perpendicular to the slab free edge, but higher than that of an unbalanced moment parallel to the slab free edge. The patterns of concrete strain are consistent with the moment directions. All tension rebars passing through column sections yield at the connection failures.
Development of seismic risk microzonation map for Semarang due to Semarang fault earthquake scenarios with maximum magnitude 6.9 Mw
Authors: Partono Windu , Irsyam Masyhur , Retno Wardani Sri Prabandiyani
Published: March 2018

Research on seismic microzonation of Semarang is still ongoing. The first seismic microzonation research for this area was performed on 2015. Seismic microzonation map was developed by implementing deterministic 1-D site response analysis at 190 boring locations. Lasem fault was considered to be the main earthquake source which taken into account for seismic microzonation research of Semarang. The second research for developing seismic microzonation map was performed on 2016. Following the research conducted by Team for Updating Seismic Hazard Maps of Indonesia 2016, Rawapening Fault, Ungaran Fault, Weleri Fault, Demak Fault and Semarang Fault are five new shallow crustal fault earthquake sources identified in this research. This paper presents the development of seismic risk microzonation map caused by Semarang fault earthquake scenarios with maximum 6.9 Mw. Deterministic 1-D site response analysis was performed at 288 boring locations for developing seismic risk microzonation map. This research was performed by implementing response spectral matching and site propagation analysis. Due to inadequate data caused by Semarang fault earthquake, response spectral matching was implemented in this research to obtain modified acceleration time histories. All acceleration time histories were developed from five different earthquakes with magnitude 6.05 – 6.9 Mw and maximum epicentre distance 15 Km.
Right Turn Coeficient Evaluation Analysis on Intersection capasity formula at Indonesia Highway Capasity Manual 1997 Using Vehicle Tracking Simulation
Authors: Kami Hari Basuki , Djoko Purwanto
Published: March 2018

The aims of this study are to evaluate the the right-turn coefficients at intersection capasity formula by Indonesia Highway Capacity Manual (MKJI 1997). Therefore, it is necessary for analysis that examines right-turn coefficient values in intersection capacity function. The simulation with many various geometric intersections defined by many scenarios using vehicle tracking application program, which increase the space maneuver vehicle at the intersection includes: 1) widen approach lane; 2) add a right-turn lane; and 3) backward median in each approach. Intersection performance Analysis will produce degree of saturation that is affected by right-turn coefficient according to the simulated vehicle maneuver using new formula. The study can be concluded that the intersection changes the right-turn factor adjustment which was originally set with the value based on linear function being a log function. According to the new function, Prt Less 2,5% right turn vehicle make significant decrease of intersection capacity, that why, it makes many conflict based on opposite traffic from other approach. In the other side, if Prt more then 2,5%, it makes increase intersection capacity because intersection space used to right turn vehicles.
Developing a Prototype of Early Warning System of Delay Risks for Public Projects (EWaSDRiP)
Authors: Utomo Dwi Hatmoko Jati , Priyono Hery , Agung Wibowo Mochamad , Radian Khasani Riqi
Published: March 2018

Delays may occur during pre-construction or construction phases, or both. The aim of this research is to develop a prototype of an early warning system of delay risks for public projects in pre-construction phase (EWaSDRiP). These delays are attributed to owner, consultant, project characteristics, and external factors. Data was collected through literature review, observations on project reports, interview, and questionnaire surveys with 30 respondents from government client teams, contractors and consultants. The respondents were asked to validate the indicators, and estimate their weight and the degree of accuracy. A 1 to 10 Likert scale reflecting worst to excellent is used to score the state of each of the delay indicators within three zones, i.e. red (scale 1-3), yellow (4-6), green (7-10). The delays in red zone indicates that they pose dangerous threats to the project and must be monitored closely, delays within yellow zone indicate moderate threats to the project, while delays in green zone means that they are unlikely to delay the project. EWaSDRiP gives a visual indication of which zone most delays are distributed. This prototype is potentially beneficial for the owner or government client team to prepare strategic actions for the relevant pre-construction delays accordingly.
Behavior of Geopolymer Concrete Confined by Circular Hoops
Authors: Muslikh  , Anggraini N. K. , Hardjito D. , Antonius
Published: March 2018

This paper discusses the behavior of geopolymer concrete subjected to passive confinement under compression loads. The confinement is induced by the use of lateral hoops, assembled from un-deformed reinforcing bars. To compare the effect of confinement, identical specimens were produced using conventional concrete with the similar concrete compressive strength. The cylinder specimens were 100 mm in diameter and 200 mm in height, and the hoops were placed on the outer most fibers of the cylinders, perpendicular to the line of loading, with no concrete cover. The parameters analyzed in this study were the steel bar to concrete volumetric ratio, the hoop spacings and the steel yield stresses. The experimental results show that unconfined geopolymer concrete were very brittle compared to the unconfined Portland cement concrete. The strength enhancement (K value) of the confined geopolymer concrete was higher than K value of Portland cement concrete. Confined geopolymer concrete also has better deformability compared to the confined Portland cement concrete. The average confinement effectiveness of geopolymer concrete also has a higher value than that commonly used in the Indonesian Concrete Standard (SNI), that is 4.1. The results were further assessed to the most recent experimental test results conducted in this area.
Critical Success Factors in Developing Collaborative Design-Build Project Team to Improve Project Performance
Authors: Nursin Afrizal , Latief Yusuf , Ibrahim
Published: March 2018

To complete a construction project, it takes the cooperation and collaboration of stakeholder involved in construction projects to obtain optimum project performance. Problems that frequently occur in construction projects is the lack of cooperation, lack of trust, ineffective communication, lack of visualization of the planned buildings and different relationships between stakeholders that project performance is not optimal. To overcome these problems need to develop a model of collaboration between stakeholders in a construction project. The purpose of this research is to identify the critical success factors of the collaboration of design and build construction project team so that can understand the influence of collaboration model to collaboration performance with the geographic, professional, stakeholder, and ethnic cultural boundary spanners in design and build construction project in Indonesia. This research uses factor analysis and variable relation with Structural Equation Modeling (SEM) method. The results found that geographical and ethical boundaries are influencing collaborative performance significantly.
Predicting Lead (Pb) Contaminant Migration through Landfill Liner
Authors: Purwono  , Arief Budihardjo Mochamad
Published: March 2018

Temanggung Landfill is equipped with a liner system that consists of gravel, geotextile, geomembrane, and compacted clay. However, there is still potential for contaminant mobilization through liners to the surrounding environment, especially the soil beneath the landfill. The purpose of this research is to simulate the movement of lead (Pb) in landfill, vertically at every depth. Contaminant migration from landfill across time can be predicted using POLLUTEv7 software, a one-dimensional model that can describe contaminant mobilization affected by dispersion, advection, diffusion, and retardation phenomena. Over a period of 15 years simulated by the model, the concentration of Pb increased continuously. The initial concentration of Pb above the liner was 0.56 mg/l. This level dropped to 0.35 mg/l after passing the liner in the first year, then increased to 0.4106 mg/l in the second year, and kept increasing up to 0.5071 mg/l in the 15th year.
Palaeoecological analysis of Sentolo Formation based on foraminifera fossil assemblage from stratigraphic cross-sectional measurements in Pengasih, Kulon Progo, Yogyakarta
Authors: Kurniasih Anis , Idham Fauzan Muhammad , Winarno Tri , Setyawan Reddy
Published: March 2018

Sentolo formation that is included in the Kulon Progo stratigraphic series has a wide distribution. Although there have been a number of studies on it, more detailed research is needed, as there are still many unexplored outcrop locations. Moreover, there are still a lot of questions about the stratigraphic relationship between Sentolo Formation and Oligocene-Miocene volcanic series of Kulon Progo. Based on this background, this study is focused on the existence of foraminifera fossil in Sentolo Formation as an indicator of palaeoecological conditions at the time Sentolo Formation was deposited. This research is very important to get a detail understanding about the indicators that are influential at the time of deposition process of Sentolo Formation in research area. Based on palaeoecological analysis, the palaeoecology at the time Sentolo Formation deposited was normal marine continental slope waters. Meanwhile, the community structure of foraminifera indicates a stable water conditions in a marine environment that was not disrupted by volcanism, so it becomes a good factor for the growth of foraminifera. Whereas the presence of volcaniclastic material mixed with carbonate which is occurred in the lower part of Sentolo Formation were interpreted as reworked of older volcanic rock.
Analysis of Landslide Disaster Impact Identification Using Unmanned Aerial Vehicle (UAV) and Geographic Information System (GIS) (Case Study: Ngesrep Sub District, Semarang City)
Authors: Prasetyo Yudo , Bashit Nurhadi , Azeriansyah Reyhan
Published: March 2018

Landslide is a natural disaster that commonly happens in Indonesia, especially in Region of Semarang that geologically has hilly topography. In Semarang city, there are 22 Sub Districts classified as landslide potential areas, which one of them is Sub District Ngesrep, based on to BPBD Semarang. The disaster of landslides can cause human injuries and loss in infrastructure, life, and assets. Disaster management requires identifying for the impact of landslide disaster at a location. One of the methods to identifying the impact of landslide disaster uses UAV technology. UAV technology can be used to collect, map, extract information of landslide and build Digital Model in surface or elevation based on overlapping imageries. Elevation data from UAV are combined with data of rainfall, land cover and geological which will produce the map of the potential landslide disaster. The map of the potential landslide disaster is combined with the result of land cover digitation to determine the impact of landslide disaster.
The Spatial Analysis to Choose a Location to be Designated as a Landfill Site
Authors: Zaim Zaflis , Asteriani Febby
Published: March 2018

Pekanbaru city has a landfill site (TPA). The local government estimated that it could only accommodate disposal for the next 2 years and a half. The aims of this research are: to identify a location suitable to be designated as a landfill site and considering to the land use change. The methods it employed were the overlay technique in Geographic Information System and Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) as non-spatial analysis. Research findings found 4 feasible locations using GIS, i.e: Palas Sub-district and Rumbai Bukit Sub-district in Rumbai; Tebing Okura Sub-district in Rumbai Pesisir; Sail Sub-district in Tenayan Raya; and Labuh Baru Sub-district in Payung Sekaki District. From the TOPSIS, a number of locations with a specific rank were found such as: Rumbai, Rumbai Pesisir, Tenayan Raya & Tampan District. This research have one recommendation namely that Rumbai is the most suitable district to be designated as a landfill site.
Development of two components acceleration time histories for Semarang, Indonesia, due to Semarang fault earthquake scenarios using 30 meters soil deposit model
Authors: Partono Windu
Published: March 2018

Development of surface acceleration time histories is important for dynamic analysis of structure design and evaluation. Acceleration time histories usually developed from seismograph records due to specific earthquake event. Following the research conducted by Team for Revision of Seismic Hazard Maps of Indonesia 2010 and 2016, Lasem fault and Semarang fault are two closest and dangerous shallow crustal fault earthquake sources which must be taken into account for seismic mitigation of Semarang. This paper presents the development two components surface acceleration time histories for Semarang caused by Semarang fault earthquake scenarios, with magnitude from 6 Mw to 7 Mw and maximum epicentre distance 15 Km. This research was performed by conducting deterministic hazard analysis, response spectral matching and site response analysis to obtain a pair of modified acceleration time histories. Site response analysis was performed by conducting 30 meters soil deposit model by taking the assumption that the position of bedrock elevation is 30 meters below the surface layer. Modified acceleration time histories were developed from a pair time histories (North-South/NS and East-West/EW direction) collected from worldwide historical earthquakes. Modified time histories were developed due to limited time histories data caused by Semarang fault earthquake source.
E-Translator Kawi to Bahasa
Authors: Sudana Oka , Putra Darma , Sudarma M. , Hartati Rukmi S. , Pradnya Prastika Ryan , Wirdiani Ayu
Published: March 2018

Kawi Language is a kind of language which has developed in Java during the Hindu-Buddhist era in the ancient Indonesian archipelago. As the time passed, Kawi began to come to extinction. To overcome this, preservation of Kawi language can be done by enhancing the understanding of culture through the use of technology. Technology that can be used for cultural preservation is one of NLP based applications such as Kawi Language to Bahasa Translator Application which is developed in this research. The translator application is an application that translates from one language to another. The result of translation of the translator application is a language that is easy to understand by the people or commonly used language. This translator application is developed to processes Kawi Language text into bahasa based on search method which each word inserted. The stemming method used is Bobby Nazief & Mima Adriani Algorithm using Kawi Language rule. The translated Kawi Language text can be a word, sentence or paragraph with the result of the Text in Bahasa as well as words, sentences or paragraphs.
Fatigue Testing and Evaluation of Fatigue Strength under Multiaxial Stress State; Why do we need fatigue testing?
Authors: Itoh Takamoto , Ogawa Fumio , Morishita Takahiro
Published: March 2018

Types of multiaxial fatigue tests and their experimental results are presented in this paper. There are typical three types in multiaxial fatigue tests: the combining push-pull and reversed torsion loading test using hollow cylinder specimen, the biaxial tension-compression test using cruciform specimen and the inner pressure applied the push-pull loading test using the hollow cylinder specimen. In the combining a push-pull loading and a reversed torsion loading test, failure life under non-proportional loading in which principal directions of stress and strain were changed in a cycle was shortened compared to proportional loading in which those are fixed. Fatigue lives were well-correlated using a non-proportional strain range considering the effect of strain path and material dependence. In the biaxial tension-compression test, the failure life decreased with increase of the principal strain ratio. In the inner pressure applied the push-pull loading test, cyclic deformation behaviour due to complex loading paths of multiaxial fatigue tests with the inner pressure associated with push-pull and rev. torsion acted to reduce the failure lives. Experimental investigation of multiaxial failure life and elucidation of their governing mechanism is essential and it can broaden the applicability of structural components.
Rear Wheel Drive Recumbent Bicycle for Urban Transportation in a Tropical Emerging Country
Authors: Suhardi Bambang , Priadythama Ilham , Laksono Pringgo Widyo
Published: March 2018

Bicycle for urban transportation in emerging countries still relies on “upright” bicycle which is unchanged since the 20th century. In a tropical emerging country such as Indonesia, a bicycle must be ergonomically designed because it may be used in a long run. On the other hand, bicycle rider may face various traffic conditions. Additionally, weather makes trip become heavy and takes a lot of energy. This research aims to develop and test a new bicycle concept for an urban transportation in the tropical emerging country. A multi-criteria decision method was used to select a right bicycle concept. Then the concept was detailed into a bicycle design. We used biomechanics model and simulated finite element method to verify its frame strength. After the design verified, we built a full bicycle prototype and compare it with a commercially available urban bicycle with equal specifications. The comparison tests include physiological tests and a subjective test for several terrain and traffic conditions. The new concept is an ergonomic bicycle based on rear wheel drive recumbent bike. Based on the overall test result, it can be concluded that the new bicycle concept is promising and still appropriate for the next development.
Structural analysis for in-service gas pipeline lowering using numerical method
Authors: Safarudin Mochamad , Setiawan Joga Dharma
Published: March 2018

Construction of new highways, buildings, airport runways and other facilities is often planned at locations where aboveground pipelines are present. Relocating such lines can be extremely expensive in terms of shutdown time and new pipeline materials. Lowering this existing pipeline can have big cost benefits. The line can be lowered while remaining in service with no lost production and the cost of such lowering an existing pipeline section is relatively cheap. In this paper, the calculation method with both analytically and numerically are discussed and explained in a 28 in pipeline lowering process while keep the pipeline is safe and still in-service.
Machine health prognosis based on multiregime condition monitoring signals
Authors: Widodo Achmad , Prahasto Toni , Satrijo Djoeli , Setiyana Budi , Sugiyanto  , Haryanto Ismoyo , Djoko Susilo Didik
Published: March 2018

This paper presents a proposal for machine health prognosis based on multi regime condition monitoring (CM) signals. The basis idea is performing deeply analysis of CM signals that possibly includes steady state signals – that is normal condition, and developing transient signal that represents some faults exist in the machine. Trigonometric features is extracted from such signals and some energy vectors was used to calculate the health index of machine. Prognosis is then performed on the machine which has the lowest health index, that means the worst condition of the machine. RUL prediction is addressed to estimate the remaining life of the machine up to breakdown. The proposed method gives relatively promising results of RUL prediction that possibility give some times for maintenance actions before catastrophic failure occurs.
Measurement of injury rate on fish skin and performance comparison based on L*A*B* and HSV color spaces
Authors: Tran Minh Thien , Rantung Jotje , Nguyen Trong Hai , Kim Hak Kyeong , Kim Sang Bong
Published: March 2018

This paper analyses and compares the performance of L*A*B* and HSV color spaces and applies them to calculate the injury rate on fish. To do these issues, the following steps are done. An original image is transformed into L*A*B and HSV color spaces. A channel “a” is separated from L*A*B* color space. In channel a, a formula to adjust “channel a value” is proposed to realize the shapes of injury on fish clearly and a new channel a is obtained by adjusting the channel a. The new channel “a” is converted into injury binary image by manual threshold. Otsu’s method is applied converted the original channel a image of fish shape into binary image. Finally, by calculating the number of pixels of areas of shape and total injury of fish, the injury rate is calculated. The steps of image processing of HSV color space is similar to L*A*B* color space. The proposed process are tested on fish.
Optimization of Ridge Waveguide Structure for Temperature Sensor Application Using Finite Difference Method
Authors: Yulianti Ian , D. P Ngurah Made , Lestiyanti Yuni , Kurdi Ojo
Published: March 2018

This work presents optimization of the dimension of ridge waveguide structure to be used as temperature sensor. The objective of the work is to obtain an optimum dimension of ridge waveguide so that it provides high sensitivity to temperature. Ridge waveguide structure was chosen since it has strong light confinement and low bending loss. The optimization was done by simulating the temperature distribution and electric field distribution inside the waveguide using Finite Difference Method (FDM). The simulations were done for various waveguide width and waveguide thickness. The results showed that as the width increased, the sensitivity decreased. The optimum ranges of waveguide dimensions are between 10μm to 20μm and 15μm to 25μm for width and thickness, respectively.
Characterization chip formation of commercial steel materials at low speed cylindrical grinding processes
Authors: Isti Nugroho Wahyu , Nugroho Sri , Rusnaldy
Published: March 2018

Cylindrical grinding is the process of metal removal using multiple cutting point. The objective of the study is to investigate the chip characteristics (shape and width) and surface roughness materials. The materials are AISI 1020, AISI 1045, AISI 1090, AISI D2, and AISI 4340 with a grinding wheels WA46K8V. The research is using cylindrical grinding processes at low-speed workpiece 100 rpm, depth of cut 0.5 mm, in dry condition. Result of research is comparing characteristic chip with variable feet rate 120 mm/min, 420 mm/min, 1300 mm/min. The result is to show the increasing feedrate lead, the growth of chip width and high surface roughness value. On materials AISI 1020, AISI 1045, AISI 1090, and AISI 4340 show that chips width is related to hardness value.
The Performance of Pump as Turbine with Machined Impellers
Authors: Zariatin D.L , Kumbarasari Shanti , Rahmalina Dwi
Published: March 2018

Pump as turbine (PAT) is a type of micro hydro power plant, which uses a commercial pump as a turbine in order to generate electricity. Most of PAT facilities used centrifugal pump. The main component of the pump is impeller, which commonly produced by using casting process. However, this paper describes a manufacturing process to produce PAT impeller by using machining process. Four impellers were produced from two variations of materials (brass and AA-7075), each with 5 and 6 blades. The impellers were tested in a laboratory scale PAT power-plant facility, and the performance of each impeller was compared to its original impeller. The experiment results show that the impeller with 6 blades made of brass material improves 48.9% of power generated.
Path planning for automatic guided vehicle with multiple target points in dynamic environment
Authors: Kim Chang Kyu , Nguyen Huy Hung , Kim Dae Hwan , Kim Hak Kyeong , Kim Sang Bong
Published: March 2018

In path planning field, Automatic guided vehicle (AGV) has to move from an initial point towards a target point with capability to avoid obstacles. There are A*, D* and D* lite path planning algorithms in the path planning algorithm. This paper proposes a modified D* lite path planning algorithm using the most efficient D* lite among these algorithms. The modified D* lite path planning algorithm is to improve these D* lite path planning algorithm’s weaknesses such as traversing across obstacles sharp corners, or traversing between two obstacles. To do this task, the followings are done. First, a work space is divided into square cells. Second, cost of each edge connecting current node to neighbor nodes is calculated. Third, the shortest paths from the initial point to all multiple target points are computed and the shortest paths from any target point to remaining target points including the goal point are computed by using Hamilton path. Fourth, a cost-minimal path is re-calculated as soon as the laser sensor detects an obstacle and make an updated list of target points. Finally, the validity of the proposed modified D* lite path planning algorithm is verified through simulation and experimental results.
Modal Analysis of Replica Boss Hole During the Deburring Process in Aerospace Manufacturing Industry
Authors: Andriani Claudy , Caesarendra Wahyu , Tjahjowidodo Tegoeh , Wijaya Tomi , Pappachan Bobby K
Published: March 2018

The monitoring of surface finishing processes in aerospace manufacturing industry becomes one of key issues to maintain the overall quality of product or part. To date, the surface quality monitoring post machining processes such as deburring, use visual inspection, surface roughness test or laser gap gun. The whole manufacturing process then requires a considerable amount of time as the production line must be halted due to these measurements taking place. This study presents an online monitoring system to measure the chamfer quality of replica boss hole post-deburring process. Vibration signal was measured during the deburring process and the features that correlate to the deburring stages (passes) were extracted. This paper focuses on the validation of actual vibration signal with the modal analysis of work coupon (replica boss hole) to obtain the correlation between the vibration amplitude level on particular region and the mode shape of work coupon during the deburring process.
Investigation of Mechanical Properties of Al7Si/ SiC and Al7SiMg/SiC Composites Produced by Semi Solid Stir Casting Technique
Authors: Sulardjaka  , Nugroho Sri , Suyanto  , Fitriana Deni Fajar
Published: March 2018

Mechanical characteristic of silicon carbide particle reinforced aluminum matrix composites produced by semi solid stir casting technique was investigated. Al7Si and Al7SiMg were used as metal matrix. High purity silicon carbida with average particle size mesh 400 was used as reinforcement particle. Aluminum matrix composites with variation of SiC: 5 %, 7.5 % and 10 % wt were manufactured by the semi solid stir casting technique. Stiring process was performed by 45 ° degree carbide impeller at rotation of 600 rpm and temperature of 570 °C for 15 minutes. Characteritation of composites speciment were: microscopic examination, density, hardness, tensile and impact test. Hardness and density were tested randomly at top, midlle and bottom of composites product. Based on distribution of density, distribution of hardness and SEM photomicrograph, it can be concluded that semisolid stir casting produces the uniform distribution of particles in the matrix alloy. The results also indicate that introducing SiC reinforcement in aluminum matrix increases the hardness of Al7Si composite and Al7SiMg composite. Calculated porosities increases with increasing wt % of SiC reinforcements in composite. The addition of 1 % Mg also increases the hardness of composites, reduces porosities of composite and enhances the mechanical properties of composites.
Remaining Life Assessment of Superheater Tube in Boiler of Coal Fired Power Plant
Authors: Muhajir Habib , Dwi Haryadi Gunawan , Widodo Achmad
Published: March 2018

Risk Based Inspection (RBI) would be able to establish an effective structural integrity management program, which reduces plant downtime, industry and regulatory burdens, and continue to maintain plant safety. The object of this research is final superheater of boiler coal fired power plant. Both straight tube and elbow tube of final superheater is in a medium risk category. Elbow tube has higher risk ranking because of the higher corrosion rate due to fly ash corrosion. The remaining life of straight tube is about 26 years and elbow tube is only about 7 years using corrosion rate calculations. Base on risk ranking and remaining life assessment, inspection planning can be developed for the next 3 years and prioritize at an elbow tube of the final superheater section. It can be one of the considerations for the company to pending yearly inspection in order to improve cost efficiency and reduce downtime.