bluuebunny/crossref_metadata_2025_split huggingface dataset:
Long-Term Planning for Open Pits for Mining Sulphide-Oxide Ores in Order to Achieve Maximum Profit
Authors: Kržanović Daniel , Conić Vesna , Stevanović Dejan , Kolonja Božo , Vaduvesković Jovan 
Published: January 2018

Abstract
Profitable exploitation of mineralised material from the earth’s crust is a complex and difficult task that depends on a comprehensive planning process. Answering the question of how to plan production depends on the geometry of the deposit, as well as the concentration, distribution, and type of minerals in it. The complex nature of mineral deposits largely determines the method of exploitation and profitability of mining operations. In addition to unit operating costs and metal prices, the optimal recovery of and achievement of maximum profit from deposits of sulphide-oxide ores also depend, to a significant extent, on the level of technological recovery achieved in the ore processing procedure. Therefore, in defining a long-term development strategy for open pits, special attention must be paid to the selection of an optimal procedure for ore processing in order to achieve the main objective: maximising the Net Present Value (NPV). The effect of using two different processes, flotation processing and hydrometallurgical methods (bioleaching acid leaching), on determining the ultimate pit is shown in the case of the Kraku Bugaresku-Cementacija sulphide-oxide ore deposit in eastern Serbia. Analysis shows that the application of hydrometallurgical methods of processing sulphide-oxide ore achieved an increase in NPV of 20.42%.
Characteristics of the Roof Behaviors and Mine Pressure Manifestations During the Mining of Steep Coal Seam
Authors: Hong-Sheng Tu , Shi-Hao Tu , Cun Zhang , Lei Zhang , Xiao-Gang Zhang 
Published: January 2018

Abstract
A steep seam similar simulation system was developed based on the geological conditions of a steep coal seam in the Xintie Coal Mine. Basing on similar simulation, together with theoretical analysis and field measurement, an in-depth study was conducted to characterize the fracture and stability of the roof of steep working face and calculate the width of the region backfilled with gangue in the goaf. The results showed that, as mining progressed, the immediate roof of the steep face fell upon the goaf and backfilled its lower part due to gravity. As a result, the roof in the lower part had higher stability than the roof in the upper part of the working face. The deformation and fracture of main roof mainly occurred in the upper part of the working face; the fractured main roof then formed a “voussoir beam” structure in the strata’s dip direction, which was subjected to the slip- and deformation-induced instability. The stability analysis indicated that, when the dip angle increased, the rock masses had greater capacity to withstand slip-induced instability but smaller capacity to withstand deformation-induced instability. Finally, the field measurement of the forces exerted on the hydraulic supports proved the characteristics of the roof’s behaviors during the mining of a steep seam.
Comparative Experiment Study on Nitrogen Injection and Free Desorption of Methane-Rich Bituminous Coal Under Triaxial Loading
Authors: Zhang Lei , Ye Zhiwei , Tang Jun , Hao Dingyi , Zhang Cun 
Published: January 2018

Abstract
As a kind of associated geological gas, coalbed methane (CBM) is mainly adsorbed in the coal seam. The coal-methane adsorption phenomenon can be described by Langmuir monolayer adsorptio n model, BET multilayer adsorption model and the Theory of Volume Filling of Micropore (TVFM), whereas the binary gas adsorption phenomenon can be described by the extended Langmuir Model. For the CBM in the low permeability coal seam, the amount of gas released by direct drainage is relatively limited, which cannot eliminate the gas explosion and outburst hazards. Gas injection is an effective method to promote methane drainage. In this paper, the free desorption and nitrogen injection displacement experiments are comparatively analyzed, which allows verifying the effectiveness of nitrogen injection’s enhancement to gas drainage. The experiment of injecting nitrogen gas into the coal body shows that the coal fracture can be maintained or expanded by the injected gas pressure so that more methane can be released. The nitrogen injection has a higher time efficiency than that of free desorption as well. The displacement ratio of N2/CH4 is in the range of 1-3. Both the injection pressure and confining pressure affect the displacement ratio. The analysis of the desorbed gas components shows that the relationship between the methane component and gas flooding time is an “inverted S” shape curve, and the appropriate time for the methane collection can be inferred by the time interval of the rapid decline of the curve.
Existence of a Positive Solution to a Nonlinear Scalar Field Equation with Zero Mass at Infinity
Authors: Clapp Mónica , Maia Liliane A. 
Published: January 2018

Abstract
We establish the existence of a positive solution to the problem

-

Δ
⁢
u

+

V
⁢

(
x
)

⁢
u

=

f
⁢

(
u
)

,

u
∈

D

1
,
2

⁢

(

ℝ
N

)

,

-\Delta u+V(x)u=f(u),\quad u\in D^{1,2}(\mathbb{R}^{N}),

for

N
≥
3

{N\geq 3}

, when the nonlinearity f is subcritical at infinity and supercritical near the origin, and the potential V vanishes at infinity. Our result includes situations in which the problem does not have a ground state. Then, under a suitable decay assumption on the potential, we show that the problem has a positive bound state.
Multi-Objective Optimization of Acoustical Properties of PU-Bamboo-Chips Foam Composites
Authors: Jiang Yang , Chen Shuming , Wang Dengfeng , Chen Jing 
Published: January 2018

Abstract
In this study, an effective optimization approach was proposed to improve acoustical behaviors of PU foams. The important parameters of PU foams: content of water, silicone oil and catalyst A1 were chosen and their effects on sound absorption coefficient and transmission loss of PU foams were studied by using Taguchi methods. In addition, bamboo chips were incorporated into PU foams as fillers to improve the acoustical properties of PU foams. Four controlled factors: the content of water, silicone oil, catalyst A1 and bamboo chips with three levels for each factor were chosen and Taguchi method based on orthogonal array L9(34) was employed to conduct the experiments. Based on the results of Taguchi’s orthogonal array L9(34), signal-to noise (S/N) analysis was used and developed to determine an optimal formulation of PU-bamboo-chips foam composites.
Spectral Properties of Circular Piezoelectric Unimorphs
Authors: Pustka Martin , Půst Ladislav 
Published: January 2018

Abstract
The piezoelectric unimorphs are essential resonant components of many oscillating systems including electroacoustic devices. The unimorph spectral properties are namely dependent on geometric dimensions, applied materials and mounting. Preliminary dimensioning and optimization of unimorph shape are usually carried out prior to comprehensive design work mostly based on finite element method. Simple analytical model is a suitable tool for initial design phase. This paper presents a derivation of calculation model describing natural vibrations of a circular unimorph with the piezoelectric layer diameter smaller than the elastic layer diameter. The system of equations with closed-form solution is instrumental to calculation of resonant frequencies and mode shapes for unimorphs with clamped, simply supported and free circumference. The theoretical results are compared with vibration velocity measurement of clamped unimorph sample in a wide frequency range. Analytical model derived in this paper is used to assess the effect of the thickness tolerance on unimorph resonant frequencies.
Determination of Regional Presence of Male Body Types as a Prerequisite for Improving Garment Manufacture
Authors: Doležal Ksenija , Hrženjak Renata , Ujević Darko 
Published: January 2018

Abstract
Garment manufacture and garment fit to physique is a never-ending research subject. The human body is subject to changes that are reflected in its shape and body measurements, and appear in all periods of life. Monitoring the changes and gaining insight into the actual amounts of physical dimensions of an individual population unfold numerous opportunities to affect clothing design and manufacturing. In accordance with the issues mentioned above, a research was carried out to determine male body types of the Croatian male population. Male body types for a specific clothing size determine waist and hip girth, which completes the information on main body measurement amounts. Furthermore, the types of bodies are prescribed by the European Standard 14302-3 and, accordingly, in the observed sample, the presence of a particular type is determined with respect to regional affiliation and age. This study was conducted on a sample of 4090 test subjects divided into five regions, ages 20 to 85 years, divided into seven age groups. By statistical analysis of the results, that is, by the methods of descriptive statistics, the values of physical dimensions necessary for this research were determined.
Effects of Processing Parameters on the Mechanical Properties of Aramid Air Textured Yarns for Protective Clothing
Authors: Kim Hyun Ah , Kim Seung Jin 
Published: January 2018

Abstract
This study examined the mechanical properties of a para-aramid filament according to the processing conditions of air-jet textured yarns (ATY). The specimens were prepared by changing the yarn speed, over feed ratio, air pressure, and heater temperature, which are important processing factors in the ATY process. The basic physical properties of the ATY, such as denier, tenacity, breaking strain, and initial modulus, were measured and their thermal shrinkage, such as dry and wet shrinkage, were measured to determine the thermal stability of the aramid ATY. In addition, the instability of para-aramid ATY were measured and assessed with the loop formation of ATY, according to the ATY process parameters. An examination of the effects of process parameters on the physical properties of aramid ATY revealed the core overfeed and air pressure to be the main factors. A high core overfeed and air pressure make the aramid ATY crimpy in the yarn core and entangle the fluffy loops on the yarn surface, resulting in an increase in the yarn linear density and breaking strain as well as a decrease in the tenacity and initial modulus. In contrast, these yarn physical properties were unaffected by the yarn speed, heater temperature, and wetting treatment. In addition, the dry and wet thermal shrinkage were unaffected by the process parameters of ATY. On the other hand, the instability decreased with increasing core overfeed and heater temperature and increased with increasing air pressure. These results showed that a high core overfeed makes the aramid ATY crimpy with an entangled yarn structure, and high air pressure helps provide small loops on the yarn surface. Finally, a high heater temperature makes the crimpy ATY structure more stable due to the strong heat set, which results in low instability.
Dissecting the act of god: an exploration of the effect of religiosity on economic activity
Authors: Carpantier Jean-Francois , Litina Anastasia 
Published: January 2018

Abstract
This research explores whether religiosity has a persistent effect on economic outcomes. We follow a three-step analysis. First, we use a sample of migrants in the United States to establish that religiosity in the country of origin has a lasting effect on the religiosity of migrants. Second, by exploiting variation in the inherited component of religiosity of migrants and controlling only for a baseline set of controls, we uncover a causal link between several aspects of religiosity and income level. The empirical findings of the second step suggest that i) church attendance has a positive impact on income; and ii) stronger faith is associated with a higher income. Finally, we augment the set of controls included in the measure of inherited religiosity in order to capture the effects of social capital, education, and of traits conducive to income growth. When controlling for social capital, the effect of religious attendance on economic outcomes vanishes, and when controlling for the presence of traits conducive to growth, the effect of intensity of faith vanishes as well. We therefore conclude that when properly accounting for unobservables, religiosity does not affect per capita income.
Phylogenetic survey and antimicrobial activity of cultivable fungi associated with five scleractinian coral species in the South China Sea
Authors: Xu Wei , Guo Shuangshuang , Gong Linfeng , Alias Siti Aisyah , Pang Ka-Lai , Luo Zhu-Hua 
Published: January 2018

Abstract
Relative to that of sponges, the diversity of fungi associated with corals, and their ecological roles, remain largely unknown. In this study, we surveyed culturable diversity and screened antimicrobial activity of spent culture liquid of fungi associated with five scleractinian corals collected in the South China Sea. In total, 123 fungal isolates were obtained, which were identified to 31 taxa in 23 genera from two phyla (Ascomycota and Basidiomycota) by comparing their ITS rDNA sequences with the reference sequences in GenBank. Specifically, eight genera of the Ascomycota (Periconia, Arthrinium, Engyodontium, Lasiodiplodia, Hortaea, Devriesia, Cyphellophora and Cadophora) and six genera of the Basidiomycota (Rhodosporidium, Panus, Trametes, Schizophyllum, Trichosporon and Cystobasidium) are new records for corals. The fungal communities in the five scleractinian coral species, together with those from previous studies, indicate that a high level of fungal diversity is associated with scleractinian corals. The antimicrobial activities of spent culture liquid of 31 selected fungal species were tested against five marine pathogenic bacteria. This study contributes to our knowledge of scleractinian coral-associated fungi and their potential as sources of pharmaceutical drug leads for pathogenic bacteria.
Auxin-like compounds act as protectors against UV-B irradiation in garden pea plants
Authors: Sergiev Iskren , Todorova Dessislava , Shopova Elena , Katerova Zornitsa , Jankauskienė Jurga , Jurkonienė Sigita 
Published: January 2018

AbstractPretreatment with the original auxin physiological analogues 1-[2-chloroethoxycarbonylmethyl]-4-naphthalenesulfonic acid calcium salt (TA-12) and 1-[2-dimethylaminoethoxicarbonylmethyl]naphthalene chlormethylate (TA-14) and subsequent UV-B irradiation (180 min at λmax 312 nm for 6.6 kJ·m−2) of pea plants (Pisum sativum L.) was investigated to assess if foliar application of these compounds has ability to attenuate the negative effects caused by UV-B stress. UV-B treatment increased malondialdehyde (MDA) and proline levels as well as superoxide dismutase, catalase and guaiacol peroxidase activities, but decreased hydrogen peroxide, low-molecular thiols, total phenolics and total soluble protein contents. The pre-treatment with TA compounds decreased the oxidative stress provoked by UV-B radiation detected by lower level of MDA, increased the content of thiols and UV-absorbing compounds and had favourable effect on H2O2 content and enzymatic activities. Exogenous application of auxin-like compounds on pea plantlets successfully counteracted UV-B induced oxidative stress via activation of ROS detoxifying enzymes and non-enzymatic antioxidants.
Notes on the enigmatic Thesium linophyllon and report on Thesium ramosum in Lithuania
Authors: Gudžinskas Zigmantas , Žalneravičius Egidijus 
Published: January 2018

AbstractTwo species of the genus Thesium (T. ebracteatum and T. linophyllon) are constantly recognized as members of the flora of Lithuania. However, the study on plants currently occurring in Lithuania and usually identified as T. linophyllon revealed that in fact they belong to T. ramosum. The analysis of all available data on the occurrence of T. linophyllon in Lithuania indicated that this species has never been recorded. The report on the occurrence of T. linophyllon, published at the end of the 18th century, was based on misidentified T. ebracteatum. Thus, T. linophyllon should be excluded from the list of vascular plants of Lithuania. Occurrence of T. ramosum was reported for the first time in the country. Currently, one population of this species with two subpopulations are known in the environs of Varnikai village (Trakai distr., Trakai Historical National Park). Morphological description of T. ramosum and diagnostic features of this species were provided. The structure and habitat conditions of two subpopulations were investigated in 2017. The present population of this species was revealed to consist of 52 individuals. Occurrence of young individuals in one subpopulation indicates generative reproduction of T. ramosum. Negative relationship between the number of T. ramosum individuals and the coverage of Poaceae species, and positive relationship between the coverage of Fabaceae species were revealed. Localities of T. ramosum in Lithuania are far from the area of its native distribution, and this species is ascribed to the group of established alien species. Further spread and invasion of the species is not expected.
Morphological and genetic characterization of vine grape cultivars of Herzegovina
Authors: Knezović Zrinka , Mandić Ana , Perić Nikica , Beljo Jure , Mihaljević Maja Žulj 
Published: January 2018

AbstractIn Herzegovina, different genotypes of grapevine are called the same, and the origin of these cultivars is mainly unexplored. Two groups of autochthonous cultivars are grown. The first group consists of more widespread Žilavka and Blatina, and accompanying Bena, Krkošija, Dobrogostina and Trnjak, and the second one of less common cultivars that should be preserved from extinction. Considering the small number of studies on the comparison of different methods used for analyses of similarities and relatedness of grapevine germplasm, it was interesting to assess the use of morphological characterization with molecular markers in identification of cultivars in Herzegovina. The results indicate that a similarity coefficient had a broad value range for both methods. Both methods successfully in different ways differentiated all analysed varieties, and for complete and comprehensive identification of grapevine varieties should be use.
Gabber’s presentation lemma for finite fields
Authors: Hogadi Amit , Kulkarni Girish 
Published: January 2018

Abstract
We give a proof of Gabber’s presentation lemma for finite fields. We first prove this lemma in the special case of open subsets of the affine plane using ideas from Poonen’s proof of Bertini’s theorem over finite fields. We then reduce the case of general smooth varieties to this special case.
Selected Constituent Yield Variation in the Smoke of Commercial Cigarette Brands on the Japanese Market
Authors: Hyodo Takatsugu 
Published: January 2018

Summary
This study focused on the variation in the yields of constituents in smoke from commercial cigarette brands available on the Japanese market. Nineteen commercial cigarette brands were sampled five times every two months from 2009 to 2010. The target constituents were benzo[a]-pyrene, 1,3-butadiene, benzene, formaldehyde, acetaldehyde, acrolein, N-nitrosonornicotine (NNN), 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK), carbon monoxide, “tar”, and nicotine. The results of this study showed that the coefficient of variation (CV) values varied greatly by brands, constituents, and smoking regimes. The yields of NNN and NNK in the smoke were strongly correlated to their yields in the tobacco filler blend for most brands. The yields of benzo[a]pyrene under the International Organization for Standardization (ISO) and the Health Canada Intense (HCI) smoking regimes and 1,3-butadiene under the HCI smoking regime were found to be influenced by the measurement. It was shown that factors for variation were highly varied among constituents. The grand mean of CV values for NNN and formaldehyde associated with cigarette manufacturing over ten months and measurement at the JT laboratory under the HCI smoking regimes were 17.1% and 6.6% respectively. The grand mean of CV values for NNN and formaldehyde associated with both cigarette manufacturing over ten months and measurement at different laboratories under the HCI smoking regimes were 23.7% and 22.9% respectively. This is due to the fact that formaldehyde showed the highest CV values for reproducibility among the constituents. Thus, in order to set realistic and robust confidence intervals, it is very important to take into account the variations associated with cigarette manufacturing and measurement within and between laboratories.
Hermite-Hadamard Type Inequalities with Applications
Authors: Khan M. Adil , Ali Tahir , Khan Tahir Ullah 
Published: January 2018

AbstractIn this article first, we give an integral identity and prove some Hermite-Hadamard type inequalities for the function f such that |f″|qis convex or concave for q ≥ 1. Second, by using these results, we present applications to f-divergence measures. At the end, we obtain some bounds for special means of real numbers and new error estimates for the trapezoidal formula.
Some New Fractional Fejér Type Inequalities for Convex Functions
Authors: Set Erhan , Mumcu İlker 
Published: January 2018

Abstract
In this paper, firstly, a new identity for conformable fractional integrals is established. Then by making use of the established identity, some new fractional Fejér type inequalities are established. The results presented here have some relationships with the results of Set et al. (2015), proved in [6].
Boundedness and compactness of Hardy-type integral operators on Lorentz-type spaces
Authors: Li Hongliang , Sun Qinxiu , Yu Xiao 
Published: January 2018

Abstract
Given measurable functions
ϕ, ψ on

ℝ
+

{\mathbb{R}^{+}}

and a kernel function

k
⁢

(
x
,
y
)

≥
0

{k(x,y)\geq 0}

satisfying the Oinarov condition,
we study the Hardy operator

K
⁢
f
⁢

(
x
)

=

ψ
⁢

(
x
)

⁢

∫
0
x

k
⁢

(
x
,
y
)

⁢
ϕ
⁢

(
y
)

⁢
f
⁢

(
y
)

⁢

𝑑
y

,

x
>
0

,

Kf(x)=\psi(x)\int_{0}^{x}k(x,y)\phi(y)f(y)\,dy,\quad x>0,

between Orlicz–Lorentz spaces

Λ
X
G

⁢

(
w
)

{\Lambda_{X}^{G}(w)}

,
where f is a measurable function on

ℝ
+

{\mathbb{R}^{+}}

.
We obtain sufficient conditions of boundedness of

K
:

Λ

u
0

G
0

⁢

(

w
0

)

→

Λ

u
1

G
1

⁢

(

w
1

)

{K:\Lambda_{u_{0}}^{G_{0}}(w_{0})\rightarrow\Lambda_{u_{1}}^{G_{1}}(w_{1})}

and

K
:

Λ

u
0

G
0

⁢

(

w
0

)

→

Λ

u
1

G
1

,
∞

⁢

(

w
1

)

{K:\Lambda_{u_{0}}^{G_{0}}(w_{0})\rightarrow\Lambda_{u_{1}}^{G_{1},\infty}(w_{%
1})}

. We also look into boundedness and
compactness of

K
:

Λ

u
0

p
0

⁢

(

w
0

)

→

Λ

u
1

p
1

,

q
1

⁢

(

w
1

)

{K:\Lambda_{u_{0}}^{p_{0}}(w_{0})\rightarrow\Lambda_{u_{1}}^{p_{1},q_{1}}(w_{1%
})}

between weighted Lorentz spaces. The
function spaces considered here are quasi-Banach spaces rather than
Banach spaces. Specializing the weights and the Orlicz functions, we
restore the existing results as well as we achieve new results in the new and old settings.