bluuebunny/crossref_metadata_2025_split huggingface dataset:
Wear Analysis of a Low-Speed Diesel Engine Connecting Rod Based on Orthogonal Simulation Test
Authors: Helal Wasim M. K. , Zhang Wenping , Li Xiaobo , Wang Guixin , Su Yanpan 
Published: November 2021

Abstract
As con-rod is a critical component in an engine, its reliability overwhelmingly directly affects the performance of the whole diesel engine. The fretting wear of con-rod bushing mainly occurs on the contact surface with con-rod small end and con-rod small end cap. In the proposed study, the contact process of con-rod small end, con-rod small end cap and bushing under maximum combustion pressure condition was analyzed, and the distribution of contact pressure and friction stress was analyzed. Then the orthogonal simulation test was designed. According to the contact mechanics theory, the interference amount and friction coefficient of the contact surface were taken as the test factors, and the maximum contact pressure and friction stress under the maximum combustion pressure condition were taken as the objective functions. The influence of the test factors on the objective function was analyzed, and the most reasonable interference amount and friction coefficient were found, so as to slow down the fretting wear of the con-rod bushing.
A Comprehensive Study of Bluetooth Low Energy
Authors: Liu Chendong , Zhang Yilin , Zhou Huanyu 
Published: November 2021

Abstract
Bluetooth Low Energy (BLE) is an innovative technique that was firstly employed in Bluetooth 4.0 and is being applied in the Bluetooth 5.0 and 5.2 technologies. Bluetooth 5.0 and 5.2 technologies are now widely used in all kinds of electronic communication equipment (e.g., PCs, tablets, smartphones, wearable devices). BLE has the capacity to minimize the power consumption and equipment cost in the low-power devices, which becomes a competitive scheme among the huge number of standard wireless transmission techniques already existing in everyday life for a large number of applications. As one of the available solutions in wireless transmission, Bluetooth technology equipped with the BLE module is very suitable for developing internet of things (IoTs) technology, which is gaining more and more interest. This paper briefly introduces the modulation and encoding of the BLE standard in the physical layer (PHY). The applications of cyclic redundancy check (CRC) in BLE are then presented. Moreover, the main characteristics, including the maximum reachable range, transmission latency, and power consumption of BLE, are also introduced.
Development of fault diagnosis platform for liquid rocket engine based on experimental data
Authors: Chang Shoujin , He Yong , Hu Haitao , Chai Jiaxin , Hu Minghe , Zhang Chi 
Published: November 2021

Abstract
Aiming at the defects of difficult to establish fault diagnosis models caused by the small scale of liquid rocket engine test data, imbalanced categories and high fault coupling, the fault diagnosis platform with 10 fault diagnosis models are developed for fault diagnosis, covering K-nearest neighbor (KNN) model, optimized KNN model, logistic regression (LR) model, optimized LR model, support vector machine model, K-means model, decision tree model, neural network model, random forest model and light-GBM model. The prediction accuracies of these models are validated based on the experimental data. Among these models, the light-GBM model provide the best prediction accuracies, and 5 models have the prediction accuracy larger than 98%.
A Method for Calculating Dynamic Parameters of Intersatellite Link Signals
Authors: Yao Jiawen , Li Shan , Gu Xiaotong , Yin Yanhao , Chen Geng , Dai Xiaonan 
Published: November 2021

Abstract
Aiming at the complex dynamic changes of inter-satellite link signals, this paper proposes a low-complexity method to calculate dynamic parameters of inter-satellite link signals so as to simulate inter-satellite link signals with complex dynamic characteristics. Based on the precise ephemeris, the algorithm is used to calculate the transmission delay and Doppler frequency of the signals in an inertial frame of reference by using iteration and interpolation. The calculation result is compared with the result obtained by using the simulation software of the global navigation system. It is found that the error of the transmission delay is at the nanosecond level and the error of Doppler frequency is at the Hertzian level. Therefore, the dynamic signal simulation accuracy can meet the requirements of load testing and verification of inter-satellite links. The algorithm is simple to implement.
The Flotation Modification Test of Chrysocolla Research on RSM
Authors: Guo Rui , Liu Siwei , Liao Zhenhong , Liu Ren 
Published: November 2021

Abstract
This study is focused on the flotation of a cooper mineral.Chrysocolla is poor flotability, surface porous, high porosity, nonuniform property, so it has strong hydrophilic and difficult dissolution. XRD and SEM were used to detect the properties and surface morphology of chrysocolla. The paper make an experiment, it contain modified polymer adsorption - intermediate metal copper ion connection - collector adsorption testing program. The experiment can exchange mineral surface property which enhancing mineral flotation and hydrophobicity. With the conclusion, the results have a trend that increasing the agents can increase mineral recovery, then mineral recovery reach the stable trend. In the simulation of RSM, mineral recovery is based on 3 factors ammonium, xanthate and agent, those factors interact with each other, simulation find the main factor is agent. RSM response surface method has the function of optimizing test results, improving test efficiency, inputting test influence factors and results, and getting the best test factors and results through test simulation.
Density Functional Theory Study of Hydrogen Adsorption on Pt Pd/γ-Al2O3 Surface
Authors: Zhang Liang , Li Jia , Chen Yong , Zeng Cheng , Kang Wu , Yang Panxing , Xiong Ru , Liu Jinhong 
Published: November 2021

Abstract
At present passive hydrogen recombiners (PAR) are used to prevent hydrogen explosion. Hydrogen removal catalyst is the core component of PAR. The adsorption of hydrogen on the solid catalyst surface is the premise of catalytic hydrogen removal and is of great significance for deeper understanding of hydrogen removal mechanism. The adsorption behavior of H2-Pt Pd/γ-Al2O3 system has been studied by using density functional theory and periodic slab model. The results of different adsorption sites indicate the adsorption energy of top site is highest, which is -1.2584eV. Higher adsorption energy means stronger interaction between H2 and catalyst substrate, which elongates H-H bond and increases the negative charge on H2. With increasing doping content of Pd, the adsorption energy of substrate decreases gradually. The adsorption energy absolute value of Pt4/γ-Al2O3 is highest and its H-H bond is longest, arriving at 0.0967nm. After adsorbed on substrate, the energy gap of H2 decreases drastically with the lowest energy gap of H2-Pt4/γ-Al2O3 that is 0.5197eV, and the peaks of density of state pattern move to lower energy level. This is because that the d orbital of Pt/Pd atoms interacts with the τ* anti-bond orbital of H2 strongly, transferring electrons to the τ* anti-bond orbital of H2. Doping Pd increases the energy gap of molecule orbital.
Prediction Models of Droplet Characteristics Based on the Locally Convergent Configurations in PMMA Microchips
Authors: Liu Zhongxin , Wang Zhiliang , Wang Chao , Zhang Jinsong 
Published: November 2021

Abstract
This paper novel designed the local convergence configuration in the coaxial channels to study the two-phase flow (lubricating oil (continuous phase, flow rate Q
c)/deionized water (dispersed phase, flow rate Q
d)). Two geometric control variables, the relative position (x) and tapering characteristics (α), had the different effects on the droplet formation. The increase of relative position x caused the higher frequency and finer droplets, and the increase of convergence angle α, took the opposite effects. The results indicated that the equivalent dimensionless droplet length Ld/Wout
and the flow rate ratio Qd/Qc
had an exponential relationship of about 1/2. Similarly, it was found that the dispersed droplets generating frequency and the two-phase capillary number, CaTP
= uTPμc/σ, had an exponential relationship. The advantage of the convergent configurations in micro-channel was the size and efficiency of droplet generation was very favorable to be controlled by α and x.
Regional disparities and seasonal differences in climate risk to rice labour
Authors: Simpson Charles , Hosking J Scott , Mitchell Dann , Betts Richard A , Shuckburgh Emily 
Published: November 2021

Abstract
The 880 million agricultural workers of the world are especially vulnerable to increasing heat stress due to climate change, affecting the health of individuals and reducing labour productivity. In this study, we focus on rice harvests across Asia and estimate the future impact on labour productivity by considering changes in climate at the time of the annual harvest. During these specific times of the year, heat stress is often high compared to the rest of the year. Examining climate simulations of the Coupled Model Intercomparison Project 6 (CMIP6), we identified that labour productivity metrics for the rice harvest, based on local wet-bulb globe temperature, are strongly correlated with global mean near-surface air temperature in the long term (p ≪ 0.01, R
2 > 0.98 in all models). Limiting global warming to 1.5 °C rather than 2.0 °C prevents a clear reduction in labour capacity of 1% across all Asia and 2% across Southeast Asia, affecting the livelihoods of around 100 million people. Due to differences in mechanization between and within countries, we find that rice labour is especially vulnerable in Indonesia, the Philippines, Bangladesh, and the Indian states of West Bengal and Kerala. Our results highlight the regional disparities and importance in considering seasonal differences in the estimation of the effect of climate change on labour productivity and occupational heat-stress.
The association of SNP g.880A/G with body weight in F1 cross Dorper x Garut sheep
Authors: L Sari A P Z N , Athifa I R , Panjono  , Hidayat R , Noor Y G , Maharani D 
Published: November 2021

Abstract
Single nucleotide polymorphism (SNP) in the MC4R gene has been known to be associated with feed intake and growth performance. Our objective was to analyze the association of SNP g.880A>G to birth weight (BW), weaning weight (WW), and 6-month body weight (MW) in F1 cross Dorper x Garut sheep. In forty-one F1 cross Dorper x Garut sheep with phenotypic records, genotyping based on SNP g.880A>G was achieved using the direct-sequencing process. As a result, the homozygous AA genotype was absent in the samples. The frequency of the G allele (90%) was higher than the A allele (10%), followed by GG (80%) and AG (20%) genotypes. The population did not deviate from Hardy Weinberg Equilibrium (p > 0.05) based on SNP g.880A>G. The SNP g.880A>G was significantly associated with MW but not significant in BW and WW. The GG genotype (32.33 ± 4.81 kg) was higher MW than the AG genotype (27.19 ± 1.86 kg). In conclusion, the findings suggested that SNP g.880A>G of the MC4R gene could be used as a potential selection tool for high MW in F1 cross Dorper x Garut sheep.
Performance of female Bali cattle in different management systems at Field Station of Sekolah Peternakan Rakyat (SL-SPR) Kuamang Abadi
Authors: Sari D A P , Muladno  , Said S , Nahrowi  , Priyanto R 
Published: November 2021

Abstract
This study aims to evaluate the performance of Bali cows in different management systems in the Field Station of Sekolah Peternakan Rakyat (SL-SPR) Kuamang Abadi. The linear body measurement and reproductive performances of one hundred twenty-six Bali cows owned by 64 farmers located in 4 villages in SL-SPR Kuamang Abadi were measured and recorded. Survey and observation were done from October to November 2020. Data were analyzed using statistical and descriptive methods. The parameters of linear body measurement included chest circle (CC), body length (BL), and body height (BH). The reproductive performance included age first calving (AFC), calving interval (CI), days open (DO), and service per conception (S/C). The result of linear body measurement showed that the largest CC was in a semi-intensive system at 158,03 cm; the largest BL and BH in the intensive system were 119,35 cm and 111,2 cm, respectively. The result of the reproductive performance showed that cattle in the semi-intensive systems had lower averages AFC, CI, DO, and S/C, i.e., 958,7 days, 375,1 days, 90,1 days, and 1,7, respectively. The results obtained can be used as the basis for improving maintenance management and the development of breeding Bali cattle in SL-SPR Kuamang Abadi.
The relationship between subclinical mastitis and reproductive performance of etawa crossbreed (PE) goat in Kokap, Kulonprogo, Yogyakarta
Authors: Nuraini D M , Andityas M , Artdita C A , Prihanani N I , Ridlo M R 
Published: November 2021

Abstract
Etawa crossbreed (PE) goat farm has been well developed in Kokap, Kulonprogo, and Yogyakarta. The important aspects that support it are doe’s health and reproductive performance. This study aimed to determine the relationship between subclinical mastitis incidence and reproductive performance of the does. This study used 84 does from four different farms, which tested using California Mastitis Test (CMT) to determine the mastitis status. The reproductive performance data gained through a questionnaire and the relation to the mastitis status was analyzed using Chi-square. The result showed that the prevalence of subclinical mastitis was 16.67 % (14 does). In the non-mastitis does, 75.71% had long calving interval (CI), 88.57% had long days open (DO), 44.29% had Litter size (LS) 1, and 12.86% had service per conception (S/C) more than 2. Meanwhile, in the mastitis group, the does with long CI was 71.43%, long DO was 85.71%, LS 1 was 28.57%, and S/C > 2 was 14.29%. The chi-square analyses showed no relationship between subclinical mastitis cases with long CI (X2=0.22), long DO (X2=0.09), LS 1 (X2=1.19), and high S/C (X2=0.02). It can be concluded that there was no relation of mastitis cases to reproductive performance of PE does in Kokap, Kuloprogo, and Yogyakarta.
Live weight performance of three different breed of indonesian local chickens in starter phase
Authors: Mustofa F , L Sari A P Z N , Agus A , Sasongko H , Suryanto E , Ulinuha Y , Widodo S , Putra A A K , Maharani D 
Published: November 2021

Abstract
The production of local chickens in Indonesia is determined by the availability of high-quality local chicken stocks. However, information on local chicken performance is limited, therefore, this study aims to determine the live weight performance of three local Indonesian chicken namely Merawang, Murung Panggang, and KUB in the starter phase. The study was conducted at chicken farm located in Semanu Gunung Kidul, Yogyakarta. Meanwhile, the live weight data were collected at the starter phase (0, 2, and 4 weeks. The samples consisted of 196 Merawang, 157 Murung Panggang, and 416 KUB chickens reared in a battery cage in a closed house under similar conditions. Furthermore, the live weight performance data were analyzed using analysis of variance (ANOVA). As a result, the Merawang chicken had the highest live weight (P<0.05) at the day-old chick (DOC) age. At the same age, no significant difference was detected between the KUB and Murung Panggang chicken (P>0.05). However, the live weight of Murung Panggang was significantly higher at 2 and 4 weeks compared to others (P< 0.05). Therefore, it was concluded that there are variations in the live weight of the three local chickens during the starter phase.
The body weight performance of indigenous indonesian chickens in the grower phase
Authors: Mustofa F , L Sari A P Z N , Suryanto E , Maharani D , Agus A , Widodo S , Putra A A K , Sasongko H 
Published: November 2021

Abstract
Body weight is a critical parameter to monitor in chickens due to its correlation with better performance during the production phase. Hence, this study aimed to present an overview of the body weight performance of indigenous Indonesian chickens in the grower phase. The study was conducted in Gunung Kidul, Yogyakarta. Data of body weight performance data of 227 Merawang, 157 Murung Panggang, and 416 KUB chickens in the grower phase were collected. These weights were measured 4 times at 6, 8, 10, and 12 weeks while rearing the chickens in battery cages in a closed house under similar management. The result showed that the Murung Panggang chickens at each age had the highest body weight and uniformity value (P<0.05), followed by Merawang and KUB. The body growth curve of the Merawang, Murung Panggang, and KUB chickens at the 6th week showed similar weights, ranging between 400-600 g. However, at the 8th, 10th, and 12th weeks, the Merawang and Murung Panggang chickens had higher body weight performance. Therefore, this study suggested that Merawang and Murung Panggang chickens may have a greater potential to attain higher final body weights.
Allele and genotype variation of follicle stimulating hormone receptor gene of Indonesian Friesian Holstein in Boyolali District, Central Java
Authors: Pambuko G , Vanessa R , Purwadi  , Widyas N , Prastowo S 
Published: November 2021

Abstract
Follicle Stimulating Hormone Receptor (FSHR) is a gene that has function to regulate reproductive performance by controlling oogenesis in females and also spermatogenesis in male. Since dairy cattle operation lies on the reproductive trait efficiency, therefore it’s became a logical reason to use FSHR genes as part of selection criteria. This study aimed to determine allele and genotype variation of FSHR gene in local Indonesian Friesian Holstein (IFH) dairy cattle in Boyolali District, Central Java. In total 20 IFH cattle we sampled for DNA source. Allele and genotype variation was determined by Polymerase Chain Reaction-Restriction Fragment Length Polymorphism (PCR-RFLP) using AluI restriction enzyme. The methods started with DNA extraction, PCR, and DNA digestion, followed by allele and genotype frequencies calculation. Two alleles were observed in this study, C and G with respective frequencies 0.75 and 0.25. According to that, we found three genotype combinations that are CC, CG, and GG, the frequencies were 0.56, 0.38, and 0.06, respectively. To use that result as a part of selection criteria in dairy cattle, especially in females, further association study with reproductive trait needs to be done.
Grati-Ongole-crossbred cattle (POGASI Agrinak) development on farm kept in diverse agroecological zones
Authors: Hartati  , Antari R , Affandhy L , Anggraeny Y N , Widiyawati R , Krishna N H , Aryogi  , Pamungkas D , Effendhy J 
Published: November 2021

Abstract
The Indonesian Beef Cattle Research Station (BCRS) has undertaken conservation and improvement of Grati-Ongole crossbred cattle (POGASI Agrinak) by distributing selected cattle into some provinces in Indonesia. This study aimed to evaluate the productive performance of the calves born in different agroecological zones. Sixty-seven male and female POGASI Agrinak were distributed in Indonesia including in upland (e.g., in 50 Kota, Payakumbuh, one bull, and nine cows and Pule, Trenggalek, one bull, and eight cows) and in low land (e.g., in Jember, one bull and six cows, Indramayu, one bull and six cows, Situbondo, 25 bulls and Tanahlaut, South Kalimantan, ten bulls). The cattle were kept under diverse environmental and management systems. The natural mating system was applied in communal pens using selected bulls. The parameters observed were the number of calves and the birth weight. It resulted in 168 calves born in the upland and five calves born in low land. While the birth weight of calves born in lowland and upland was 25.8 + 1.6 kg and 25.2 + 2.4 kg respectively. Meanwhile, the birth weight of calves in BCRS was 25.3 + 25 kg. To conclude, the birth weight both in BCRS and in those sites’ ex-situ was comparable.
Superovulatory responses using pregnant mare serum gonadotropin hormone in Murrah buffalo cows
Authors: Praharani L , Sianturi R S G , Kusumaningrum D A , Asmarasari S A 
Published: November 2021

Abstract
Superovulation plays an important role in embryo transfer program. A preliminary study carried out in the Research Institute for Animal Production evaluated superovulatory responses in Murrah buffalo cows using pregnant mare serum gonadotropin (PMSG) hormone. The three buffalo cows were estrus synchronized using 5 ml prostaglandin (PGF) twice, with an interval of 11 days. PMSG was injected intra-muscularly 3000 IU on day-10 after estrus. Prostaglandins were administered 48 hours after PMSG injection. Fixed-Time artificial insemination (FTAI) was carried out at 72 hours after the last PGF treatment. Administration of hCG 2 ml/head was given at the time of FTAI. A non-surgery flushing was performed on day 6 after FTAI. Parameters observed using ultrasonography (USG) were diameter of follicle (DFL), total follicle (TFL), and number embryos (NE). Data were analyzed descriptively. The mean of DFL before PMSG treatment was 8.2 mm and after PMSG treatment was 12.5 mm. The mean of TFL before PMSG treatment was 7.7 and after PMSG treatment was 16.1. The NE obtained was one degenerative embryo. Superovulation using PMSG increased TCL and DFL. It can be concluded that the Murrah buffalo cows superovulated by PMSG showed a good response but no transferable embryo was found.
Recombinant expression protein of Type 4 Fimbrial gene (ptfA) of Pasteurella multocida
Authors: Yanthi N D , Herlina N , Agung P P , Dewi K S 
Published: November 2021

Abstract
The Fimbrial type 4 gene is one of the virulence factor genes associated with bacterial adhesion and colonization factors in Pasteurella multocida. The activity of this gene has a surface covering effect on the host it is ridden on. So that the cell surface in the host is difficult to function. Pasteurella multocida is a microorganism that attacks the upper respiratory tract, especially in buffalo and cattle, causing infection. The aim of this activity was to analyzed the expression and characterization recombinant ptfA for control and elimination of Pasteurella multocida. Gene transformation was carried out using E coli. The induction of gene expression was carried out with IPTG concentrations ranging from 0.1, 0.25, 0.5, 0.75, and 1 mM and incubated at room temperature. The identification analysis was carried out using SDS PAGE showing the 15 KDa gene bands. The 15 kDa recombinant ptfA gene showed the highest expression at a concentration of 0.5 mM of isopropyl thiogalactopyranoside (IPTG).
Comparative study of semen quality traits between Etawah grade and Senduro bucks
Authors: Isnaini N , Hakim A A , Amertaningtyas D , Sulistyo H E , Irsyammawati A , Andri F 
Published: November 2021

AbstractThis study compared the semen quality traits between Etawah grade (EGB) and Senduro bucks (SB) raised in Singosari National Artificial Insemination Center, Indonesia. A total of 96 ejaculated semen were collected from three EGB and three SB with an average age of three years. The ejaculates were evaluated for semen volume (SV), spermatozoa concentration (SC), total spermatozoa (TS), spermatozoa motility (SM), post-thawing spermatozoa motility (PTSM), the recovery rate of spermatozoa motility (RRSM), and frozen semen production (FSP). Data of SV, SM, PTSM, and RRSM were compared using the Mann-Whitney U test. While the data of SC, TS, and FSP were analyzed using an independent t-test. The results showed that SV, SM, PTSM, and RRSM were not significantly differed (P>0.05) between breeds. Whereas, SC, TS, and FSP of EGB were significantly higher (P<0.05) than SB. Therefore, it can be concluded that Etawah grade bucks can produce higher total spermatozoa and as a result higher frozen semen production for artificial insemination as compared to Senduro bucks.