bluuebunny/crossref_metadata_2025 huggingface dataset:
Regularity results for a class of widely degenerate parabolic equations
Authors: Ambrosio Pasquale , Passarelli di Napoli Antonia
Published: August 2023

Motivated by applications to gas filtration problems, we
study the regularity of weak solutions to the strongly degenerate
parabolic PDE

u
t

-

div
⁡

(

(

|

D
⁢
u

|

-
ν

)

+

p
-
1

⁢

D
⁢
u

|

D
⁢
u

|

)

=
f

 

in 
⁢

Ω
T

=

Ω
×

(
0
,
T
)

,

u_{t}-\operatorname{div}\Bigl{(}(\lvert Du\rvert-\nu)_{+}^{p-1}\frac{Du}{%
\lvert Du\rvert}\Bigr{)}=f\quad\text{in }\Omega_{T}=\Omega\times(0,T),

where Ω is a bounded domain in

ℝ
n

{\mathbb{R}^{n}}

for

n
≥
2

{n\geq 2}

,

p
≥
2

{p\geq 2}

, ν is a positive constant and

(
⋅
)

+

{(\,\cdot\,)_{+}}

stands for the positive part. Assuming that the datum f belongs
to a suitable Lebesgue–Sobolev parabolic space, we establish the Sobolev
spatial regularity of a nonlinear function of the spatial gradient
of the weak solutions, which in turn implies the existence of the
weak time derivative

u
t

{u_{t}}

. The main novelty here is that the structure
function of the above equation satisfies standard growth and ellipticity
conditions only outside a ball with radius ν centered at the
origin. We would like to point out that the first result obtained
here can be considered, on the one hand, as the parabolic counterpart
of an elliptic result established in [L. Brasco, G. Carlier and F. Santambrogio,
Congested traffic dynamics, weak flows and very degenerate elliptic equations [corrected version of mr2584740],
J. Math. Pures Appl. (9) 93 2010, 6, 652–671], and on the other
hand as the extension to a strongly degenerate context of some known
results for less degenerate parabolic equations.
Molecular characterization of the new clinical entity associated with congenital adrenal hyperplasia: the CAH-X syndrome in the Spanish population
Authors: Figueras Laura Martínez , Pacheco Rafael Muñoz , González Dolores García , Domènech María Arriba , Zubicaray Begoña Ezquieta
Published: August 2023

Objectives

The chimeras causing the CAH-X syndrome (SCAH-X) result from recombination between CYP21A2-TNXB and their respective pseudogenes (CYP21A1P-TNXA). The clinical manifestations of this syndrome include congenital adrenal hyperplasia (CAH) and Ehlers–Danlos syndrome (EDS). Since SCAH-X has been recently described, the number of publications available is limited. The objective of this study was to set up a molecular approach and a screening algorithm for detecting CAH-X chimeras, determine their frequency and distribution in the Spanish population, and assess their clinical pattern of occurrence in a group of patients.

Methods

A total of 186 patients were eligible for CAH-X molecular genetic testing. Testing included MLPA, heterodimer detection by capillary gel electrophoresis, and sequencing of exons 40, 41, and 43 of TNXB. A review was performed of the medical history of 20 patients from three hospitals of reference and the signs and symptoms of EDS they exhibited.

Results

In total, 78 CAH patients were carriers of CAH-X chimeras (41.9 %). Forty-six patients were carriers of CH1 (24.7 %), 24 of CH2 (12.9 %), and 8 of CH3 (4.3 %), with a heterogeneous geographical distribution. Seven (35 %) of the 20 carriers of a CAH-X chimera who underwent clinical examination experienced clinical manifestations of EDS.

Conclusions

The impact of SCAH-X in the Spanish population was assessed by genetic testing. In the light of the clinical pattern of occurrence and significant prevalence of SCAH-X in the Spanish population, early diagnosis of this entity is essential for an appropriate follow-up of clinical manifestations.
On the largest prime factor of non-zero Fourier coefficients of Hecke eigenforms
Authors: Gun Sanoli , Naik Sunil L.
Published: August 2023

Let τ denote the Ramanujan tau function. One is interested
in possible prime values of τ function. Since τ
is multiplicative and

τ
⁢

(
n
)

{\tau(n)}

is odd if and only if n is an odd square, we only need to consider

τ
⁢

(

p

2
⁢
n

)

{\tau(p^{2n})}

for primes p and natural numbers

n
≥
1

{n\geq 1}

.
This is a rather delicate question. In this direction, we show that
for any

ϵ
>
0

{\epsilon>0}

and integer

n
≥
1

{n\geq 1}

, the largest prime factor of

τ
⁢

(

p

2
⁢
n

)

{\tau(p^{2n})}

, denoted by

P
⁢

(

τ
⁢

(

p

2
⁢
n

)

)

{P(\tau(p^{2n}))}

, satisfies

P
⁢

(

τ
⁢

(

p

2
⁢
n

)

)

>

(

log
⁡
p

)

1
8

⁢

(

log
⁡

log
⁡
p

)

3
8

-
ϵ

P(\tau(p^{2n}))>(\log p)^{\frac{1}{8}}(\log\log p)^{\frac{3}{8}-\epsilon}

for almost all primes p. This improves a recent
work of Bennett, Gherga, Patel and Siksek.
Our results are also valid for any non-CM
normalized Hecke eigenforms with integer Fourier coefficients.
Beurling densities of regular maximal orthogonal sets of self-similar spectral measure with consecutive digit sets
Authors: Wu Yu-Liang , Wu Zhi-Yi
Published: August 2023

Beurling density plays a key role in the study of frame-spectrality of normalized Lebesgue measure restricted to a set.
Accordingly, in this paper, the authors study the s-Beurling densities of regular maximal orthogonal sets of a class of self-similar spectral measures, where s is the Hausdorff dimension of its support and obtain their exact upper bound of the densities.
Korn’s inequality in anisotropic Sobolev spaces
Authors: Benavides Gonzalo A. , Domínguez-Rivera Sebastián A.
Published: August 2023

Korn’s inequality has been at the heart of much exciting research since its first appearance in the beginning of the 20th century. Many are the applications of this inequality to the analysis and construction of discretizations of a large variety of problems in continuum mechanics. In this paper, we prove that the classical Korn inequality holds true in anisotropic Sobolev spaces. We also prove that an extension of Korn’s inequality, involving non-linear continuous maps, is valid in such spaces. Finally, we point out that another classical inequality, namely Poincaré’s inequality, also holds in anisotropic Sobolev spaces.
Exploring English newspaper reading of Chinese college English majors in mobile-assisted language learning
Authors: Peng Weinan
Published: August 2023

With advances in mobile technology, mobile devices have been widely applied in language learning. English newspaper reading apps are emerging language learning tools for Chinese English majors. However, little has been published on reading in mobile-assisted language learning (MALL) environments. Studies of English newspaper reading are limited to the classroom environment. To explore English newspaper reading in MALL, this study analysed the features of English newspaper reading apps, usage patterns, and users’ language learning strategies by adopting both quantitative and qualitative methods. This research found that (1) apps incorporating multimedia technology mainly provide vocabulary instruction. Most English majors prefer English newspaper reading apps with explanations; (2) Learners tend to use WeChat as the main reading platform instead of utilising apps in combination; and (3) The most frequently used strategies by English majors are affective strategies, while the least frequently used strategies are social strategies, although most English newspaper reading apps support collaborative learning. The study is expected to inspire the design of English newspaper reading apps and the reform of the English newspaper reading course.
Inverse problem for Dirac operators with two constant delays
Authors: Vojvodić Biljana , Vladičić Vladimir , Djurić Nebojša
Published: August 2023

We study inverse spectral problems for Dirac-type functional-differential operators with two constant delays greater than two fifths the length of the interval, under Dirichlet boundary conditions. The inverse problem of recovering operators from four spectra has been studied. We consider cases when delays are greater or less than half the length of the interval. The main result of the paper refers to the proof that in both cases operators can be recovered uniquely from four spectra.
Toward a semiotic pyramid: language studies, AI, and knowledge exchange economy
Authors: Poschinger Felix , Coon Robert
Published: August 2023

This paper addresses the interrelation between AI and language studies in the (digital) humanities in the context of knowledge exchange economies. We propose a three-dimensional semiotic model (pyramid) that includes AI as an active agent in meaning-creation into the sign system of communication and test its validity on autocompletion and predictive texting. We, therefore, analyzed 360 million tweets on COVID-19 over a period of 2 years and focused on the time-dependent shift of language use in the positive and negative extremes correlating to significant external events. The data suggest that digital language use has significantly changed over the course of the pandemic. Feedback loops are created between AI, utterance, and external reality that fossilize preconceived notions into textual isoglosses by suggesting and completing text entries. We thus argue that AI subtly changes the perception of reality by influencing the choice of wording. To mitigate the impact of AI in meaning-creation, we highlight the structural precautions undertaken by providers; we argue, however, that the (digital) humanities may re-emphasize their intrinsic value within the economy of knowledge exchange according to the subject-specific insights they may provide for language use and AI.
Bulge test technique and digital image correlation for the determination of the biaxial behavior of polymeric films
Authors: Kharrat Fatma , Chaari Rania , Khlif Mohamed , Hilliou Loic , Covas José António , Haboussi Mohamed , Bradai Chedly
Published: August 2023

Materials can display multiple mechanical behaviors when they are biaxially stressed. In this research work, films obtained through the blowing process were investigated in order to compare the mechanical properties and behavior of the film under uniaxial and biaxial stress conditions. Bulge test coupled with a continuous full-field strain measurement was undertaken in order to characterize polymeric film in a biaxial stress state. As far as this study is concerned, a laboratory-made pneumatic bulge test machine was used for the determination of the biaxial behavior of a 50 μm thickness PLSF (modified PLA) film. 3D-digital image correlation (3D-DIC) technique was used in order to compute the strain field continuously during the test. Tensile test was equally performed on the film along its machine direction (MD) and transverse direction (TD). Strain field distribution in the film sample was analyzed and compared in both tests. The tensile test results displayed an isotropic behavior of the film in both directions. However, a difference in the strain at break was noticed because of the thickness instability along the TD. The comparison between uniaxial and biaxial properties resulted in almost the same properties with respect to the Young Modulus as well as the tensile strength.
Research progress on preparation, modification, and application of phenolic aerogel
Authors: Yuan Chengfan , Wang Degang , Zhang Yijun , Li Kai , Ding Jie
Published: August 2023

Phenolic aerogel is a type of nanoporous resin-based material with low density, high specific surface area, excellent thermal insulation performance, and a high carbon residue rate which has been widely used in the field of thermal protection. However, the development of phenolic aerogel is limited by the complex and expensive preparation technique, inadequate oxidation/ablation resistance, and excessive brittleness. As a result, academic research is constantly concentrated on low-cost preparation methods and efficient modification of phenolic aerogel. This review gives a description of the preparation technology, modification techniques, and application fields of phenolic aerogel and summarizes the limitations. Now, phenolic aerogel is not applied widely due to its complex and expensive preparation technique. Moreover, phenolic aerogel shows greater brittleness and insufficient mechanical property. The prospective future developments of the materials were prospected, and the phenolic aerogel with environmental protection, efficient thermal protection, and low cost will be the mainstream research direction.
Experimental Investigation to Analyze the Effect of Cementation on the Geomechanical Behavior of Steel Slag Mixtures
Authors: Mica Nelson Gomes , Rios Sara , Viana da Fonseca António , Fortunato Eduardo
Published: August 2023

The sustainable use of resources requires new strategies to transform industrial byproducts into raw materials for other applications. This approach, inspired by circular economy fundamentals, can be successfully applied in transportation infrastructures where a significant amount of natural raw materials is generally required. Slags from the steelmaking process in electric arc furnaces are generally of two types: oxidizing (black colored) and reducing (lighter colored). In Portugal, the oxidizing steel slag or electric arc furnace (EAF) with controlled production has been certified as “inert steel aggregate for construction,” having high strength and stiffness when compared to conventional natural aggregates. However, because of the lack of fines, EAF usually requires a milling process with increased costs and CO2 emissions. This work studies the mixture of the two types of slags, because the reducing slag (also called ladle slag) is a fine powder with cementing properties that can enhance the behavior of the mixture while avoiding the milling process. Toward the application in granular layers of transport infrastructures, the testing procedures to study the geotechnical behavior of this innovative stabilized mixture are discussed combining chemical, durability, environmental, and hydromechanical analysis. Seismic wave velocity measurements with ultrasonic transducers provide the elastic stiffness evolution with time derived from the cementation given by the ladle slag. Unconfined compression strength and permeability results were used to propose an index parameter to correlate the mixture dosage to the observed hydromechanical performance. Durability measurements with wetting and drying cycles, as well as swelling and leaching test results, are also presented.
Influence of Packing Density on Electrochemical Performance of Lignin
Authors: Velhal Mrudul , Mehta Siddhi , Arole Kailash , Liang Hong
Published: August 2023

Bio-based carbonaceous materials such as lignin are taking up increasingly important roles in energy storage. However, the wide spectrum of molecular identity and structure of lignin lead to inconsistent structure, properties, and performance because of its source, extraction, and pretreatment processes. In this research, we investigate the effects of packing density on the electrochemical performance for lignin. Samples were synthesized using lignin as the electroactive material. Four distinct types of lignin, i.e., alkali lignin microparticles (MP), alkali lignin nanoparticles (NP), dealkaline lignin MP, and dealkaline lignin NP, were used in this study. They were studied through varying the packing density and its subsequent effects on the electrochemical performance. The scanning electron microscopy and Fourier-transform infrared spectrometry analysis were conducted to obtain morphology and chemical compositions. Cyclic voltammetry and cyclic charge discharge tests were conducted to evaluate the polarization resistance. The optimal packing density was found to be in the range of 0.35–0.50 g cm−3 for all samples. In the optimal packing density range, dealkaline lignin NP displayed the highest electrochemical performance with a maximum specific capacitance of 1,159 mF g−1, an energy density of 19.097 Wh kg−1, and a power density of 11.05 kW kg−1. The optimization of packing density would enable further development of lignin-containing energy storage devices such as supercapacitors.
Cleavage of VAMP2/3 Affects Oligodendrocyte Lineage Development in the Developing Mouse Spinal Cord
Authors: Fekete Christopher D. , Horning Robert Z. , Doron Matan S. , Nishiyama Akiko
Published: August 2023

In the developing and adult CNS, new oligodendrocytes (OLs) are generated from a population of cells known as oligodendrocyte precursor cells (OPCs). As they begin to differentiate, OPCs undergo a series of highly regulated changes to morphology, gene expression, and membrane organization. This stage represents a critical bottleneck in oligodendrogliogenesis, and the regulatory program that guides it is still not fully understood. Here, we show thatin vivotoxin-mediated cleavage of the vesicle associated SNARE proteins VAMP2/3 in the OL lineage of both male and female mice impairs the ability of early OLs to mature into functional, myelinating OLs. In the developing mouse spinal cord, many VAMP2/3-cleaved OLs appeared to stall in the premyelinating, early OL stage, resulting in an overall loss of both myelin density and OL number. The Src kinase Fyn, a key regulator of oligodendrogliogenesis and myelination, is highly expressed among premyelinating OLs, but its expression decreases as OLs mature. We found that OLs with cleaved VAMP2/3 in the spinal cord white matter showed significantly higher expression of Fyn compared with neighboring control cells, potentially because of an extended premyelinating stage. Overall, our results show that functional VAMP2/3 in OL lineage cells is essential for proper myelin formation and plays a major role in controlling the maturation and terminal differentiation of premyelinating OLs.

SIGNIFICANCE STATEMENTThe production of mature oligodendrocytes (OLs) is essential for CNS myelination during development, myelin remodeling in adulthood, and remyelination following injury or in demyelinating disease. Before myelin sheath formation, newly formed OLs undergo a series of highly regulated changes during a stage of their development known as the premyelinating, or early OL stage. This stage acts as a critical checkpoint in OL development, and much is still unknown about the dynamic regulatory processes involved. In this study, we show that VAMP2/3, SNARE proteins involved in vesicular trafficking and secretion play an essential role in regulating premyelinating OL development and are required for healthy myelination in the developing mouse spinal cord.
Culture of vitrified bovine ovarian tissue on agarose gel inserts maintains follicle integrity
Authors: Alkali Isa Mohammed , Colombo Martina , Luciano Alberto Maria , Nizanski Wojciech , Ali Hassan Hiba , Dziegiel Piotr , Luvoni Gaia Cecilia
Published: August 2023

In brief

Ovarian tissue cryopreservation and culture provide an option for fertility preservation without tissue grafting, but need optimization. This study reveals that vitrified bovine ovarian tissue can be cultured on agarose gel and maintain follicle morphology, low activation, and low apoptosis.

Ovarian tissue preservation is hitherto a promising fertility insurance option for precious animals. Ovarian tissue vitrification and culture combined approach would eliminate the need of transplanting ovarian tissue to obtain mature oocytes. We aimed at optimizing vitrification and in vitro culture conditions for improved bovine ovarian tissue viability. Ovaries obtained from the slaughterhouse were punched into fragments and divided into three groups. Group 1 (fresh) was divided into two and immediately placed in two-culture systems (culture inserts and agarose inserts). Group 2 was vitrified, warmed, and placed in the two-culture systems, while group 3 was only equilibrated and then placed in the two-culture systems. All cultures were maintained for 6 days and spent media were collected on alternate days for cytokine (interleukin 1β and interleukin 6) evaluation. Fragments were fixed for morphology assessment and immunohistochemistry. Higher percentages (P < 0.05) of grade 1 (morphologically intact) follicles were observed in fragments on agarose compared to those on culture inserts on days 2 and 4 of the culture. Conversely, we found higher (P < 0.05) shifts of primordial follicles to transitional follicles in fragments on culture inserts vis-à-vis agarose inserts which was consistent with a higher proportion of Ki-67 and MCM-7 and activated caspase-3-positive follicles. In conclusion, in vitro culture of bovine ovarian tissue on agarose inserts maintained follicle morphology, low follicle activation, and low apoptosis compared to culture inserts.
7. századi temetkezések Békés vármegyéből – Adatok a Tiszántúl avar kori lószerszámos temetkezéseihez
Authors: Balogh Csilla , Gulyás András , Lőrinczy Gábor
Published: August 2023

Absztrakt

A dolgozat a Békésszentandrás-Benda-tanya és Szarvas-Kovács-halom lelőhelyről nyolc, a 7. század második és harmadik negyedéből származó temetkezés régészeti elemzését adja. A nyolc temetkezésből öt ún. lószerszámos temetkezés, vagyis a sírokba csak a lószerszám került elhelyezésre. Ezek nemcsak a Tiszántúlról eddig ismert lószerszámos temetkezések számát növelik, hanem új adatokat is szolgáltatnak e temetkezési szokás értékeléséhez.
POTENSI LESTARI IKAN LAYANG (Decapterus spp) YANG DIDARATKAN DI PEMANGKAT, KALIMANTAN BARAT
Authors: Setya Dona , Susiloningtyas Dewi , Nurulludin Nurulludin
Published: August 2023

Ikan layang merupakan jenis ikan yang paling banyak tertangkap di Laut Natuna Utara dan didaratkan di PPN Pemangkat. Perkembangan produksi ikan layang yang di daratkan di Pemangkat mengalami penurunan yang cukup signifikan pada tahun 2009 sampai tahun 2017 (Data Produksi PPN Pemangkat). Usaha penangkapan ikan layang di Laut Natuna Utara menunjukkan kearah over fishing dengan produksi semakin menurun tetapi upaya penangkapan meningkat. Tujuan penelitian ini untuk menyusun opsi  pengelolaan terbaik pada perikanan purse seine di Pemangkat dengan menggunakan  Model Fox pada Surplus produksi dan data 10 tahun dari PPN Pemangkat. Hasil perhitungan surplus produksi Model Fox menunjukkan besaran Maximum Suistainable Yield (MSY) pada Laut Natuna Utara yaitu 2.412.016 kg dengan jumlah tangkapan yang diperbolehkan sebesar 1.929.612 kg/tahun dan upaya optimumnya sebesar 18.170 upaya.Ukuran rata-rata mata jaring di PPN Pemangkat yaitu 1cm dan belum sesuai dengan peraturan yang ditetapkan. Pengawasan pemerintah terhadap penggunaan dimensi alat tangkap yang dilarang oleh PERMEN-KP No.18/ 2021 perlu terus ditingkatkan. Pengelolaan terbaik lainnya dengan pengaturan upaya penangkapan dan alat tangkap seperti tahun 2010 yaitu 32 kapal dengan trip 388 kali per tahun.
LAJU TANGKAP, KEPADATAN STOK DAN BEBERAPA ASPEK BIOLOGI UDANG JERBUNG (Penaeus merguiensis) DI PERAIRAN DOLAK, LAUT ARAFURA
Authors: Hargiyatno Ignatius Tri , Sumiono Bambang , Suharyanto Suharyanto
Published: August 2023

Udang jerbung (Penaeus merguiensis) merupakan salah satu komuditas ekspor dari Indonesia dan menjadi target penangkapan kapal pukat udang yang beroperasi di Laut Arafura. Penelitian ini bertujuan untuk menganalisa laju tangkap, kepadatan stok dan beberapa aspek biologi udang jerbung yang berada di Laut Arafura khususnya di perairan Dolak. Dari 229 kali towing jumlah hasil tangkapan udang jerbung adalah 6.705 kg. Rata-rata laju tangkap udang jerbung adalah 32,2 kg/haul atau 13,4 kg/jam. Dengan menggunakan metode luas sapuan trawl diduga kepadatan udang jerbung adalah 0,19 kg tiap km2. Panjang karapas dari 630 ekor udang jerbung berkisar antara 17-53 mm dengan nilai rata-rata 29,97 mm dan bobot rata-rata 26,13 kg. Hubungan bobot dan panjang karapas udang dapat dinyatakan dalam persamaan W = 0,006L2,448, r= 0,95 dengan nilai b = 2,448. Distribusi kelamin didominasi oleh udang betina dengan perbandingan antara jantan dan betina adalah 1,00:2,08. Lima puluh persen dari udang jerbung yang pertama kali tertangkap (Lc) berukuran 27,8 mm, sedangkan ukuran pertama kali matang gonad (Lm) adalah 38,7 mm. Hal ini mengidikasikan udang berukuran kecil mendominasi hasil tangkapan, dimana terbukti bahwa dari total 426 sampel udang betina 75,4 % dalam kondisi tidak matang gonad. Jika penangkapan terus berlanjut tanpa kontrol maka akan terjadi penurunan populasi sumberdaya udang, sehingga perlu pengelolaan yang berkelanjutan dengan menerapkan penutupan musim dan daerah pemijahan sumberdaya udang jerbung.Banana prawn (P. merguiensis) is one of the important Indonesian export commodities and the target of shirmp trawl catching in Arafura Seas. The objectives of this research were: 1). To analyze catch rate 2). estimate the stock density and3).  to study some biological aspect of Penaeus merguiensis in Arafura Seas. From a total of 229 trawl towing, amount of 6.705 kg of banana prawn was caught with an average of catch rate of 32,2 kg/houl or 13.43 kg / hr. By using swept area methods, the density of banana prawn was abouth 0.19 kg/km2. Average carapace length of 630 banana prawn tails was 29.97 mm and the average weight was 26,13 kg with a length range between 17 mm to 53 mm.. Size was first caught (Lc) on the size of 29.85 mm. Carapace length-weight relationship was  equation W = 0,006L2,448,r2 = 0,95 with b = 2,448. Distribution is dominated by female shrimp. Sex ratio between males and females is 1.0: 2.08. The size of 50% banana prawn at first caught (Lc) was 27,8 mm, while the siae of the first mature gonads (Lm) was 38,7 mm. It is indicating that the small prawn dominated the catch, which the proved also by out of total 426 samples of female prawn, 75,4% were having immature gonads. The resources will be decreased if the fishing activities continue without control, so required sustainable management by applying the close season and close area where prawn are spawning.
DINAMIKA POPULASI IKAN SWANGGI (Priacanthus tayenus) DI PERAIRAN TANGERANG – BANTEN
Authors: Prihatiningsih Prihatiningsih , Sadhotomo Bambang , Taufik Muhamad
Published: August 2023

Ikan swanggi merupakan ikan ekonomis dan ekologis penting dan statusnya di perairan belum terevaluasi dengan baik. Penelitian ini bertujuan untuk mengetahui pertumbuhan, umur dan mortalitas ikan swanggi yang dapat memberikan kontribusi terhadap pengelolaan sumber daya ikan yang berkelanjutan dan lestari. Data frekuensi panjang dan berat ikan pada Januari – Desember 2012 diperoleh dari perairan Tangerang dan sekitarnya berasal dari hasil tangkapan jaring cantrang. Sebaran frekuensi panjang ikan dipisahkan kedalam sebaran normal menggunakan metode Bhattacharya. Hubungan panjang-berat ikan swanggi jenis jantan dan betina bersifat allometrik negatif dan memiliki faktor kondisi yang baik (k=1,26). Rata-rata ukuran pertama kali tertangkap ikan swanggi (Lc=20,84 cm) lebih besar dibandingkan dengan ukuran pertama kali matang gonad (Lm=16,03 cm). Ikan swanggi dapat tumbuh hingga mencapai panjang infinitive (L∞) = 32,34 cm dengan laju pertumbuhan (K) sebesar 0,91 tahun-1 dan nilai dugaan umur teoritis pada saat panjang ikan sama dengan nol (t0) adalah 0,14 tahun-1. Panjang maksimal ikan swanggi  diduga berumur 3,5 tahun dan rata-rata panjang ikan pertama kali matang gonad (Lm) diduga berumur 0,75 tahun. Mortalitas alami (M) ikan swanggi adalah 1,67, mortalitas karena penangkapan (F) 0,83, mortalitas total (Z) 2,50 dan tingkat eksploitasi (E) sebesar 0,33 yang berarti pemanfaatannya masih dapat ditingkatkan sekitar 34% dari keadaan saat ini. The purple spotted bigeye an economically and ecologically important fish and status  in the waters have not been evaluated well. This research was aimed to understand the growth, age and mortality of the purple spotted bigeye. It was hoped that the results of this research can be contributed in sustainable fisheries management. The  length frequency data and weight of fish in January - December 2012 was obtained from Tangerang and surrounding waters derived from trawl’s catch,. The size distribution of the fish was divided into normal distribution by using Battacharya Method. Length weight relationship of the male and female fish were negative allometric and has a good condition factor (K=1,26). The average length at first capture of the purple spotted bigeye (Lc = 20,84) was higher than the average length at first maturity (Lm=16,03). The purple spotted bigeye can grow into infinitive length of (L∞) = 32,34 cm with growth rate (K) of 0,91 year-1 and (t0) value of 0,14 year-1. The maximum length of the fish was predicted reach at age of 3,5 years with the average length of first maturity predicted reach at age 0,75 years. Natural mortality value (M) of the purple spotted bigeye was 1,67; fishing mortality (F) value was 0,83; total mortality value (Z) was 2,5 and exploitation rate (E) was at 0,33 which mean utilization can be improved about 34% from the current state.
Trabajo en casa y plan de emergencias
Authors: Gómez Romero Sandra Isabel , Uribe Montaña Sandra Liliana , Vergel Vila Laura Constanza , Guarín Arciniegas Ingrid Yazmin
Published: August 2023

Teniendo en cuenta la modalidad de “trabajo en casa” que trajo consigo la pandemia ocasionada por el COVID-19 la Universidad Militar Nueva Granada por medio del Programa de Administración de Riesgos, Seguridad y Salud en el Trabajo realizó un proyecto de investigación titulado “Condiciones ergonómicas y de seguridad en los trabajadores remotos (trabajo en casa) tras la pandemia de COVID-19”, en el que se buscaba identificar los factores de riesgo presentes en los entornos laborales de las personas, calificar los riesgos y generar estrategias de intervención que buscarán su control; es así como surge la idea de gestionar el factor de riesgo de seguridad ligado al plan de emergencias correspondiente a la casa del trabajador o de su entorno, en caso de que viviera en edificio o en conjuntos residenciales. De esta forma, fortalecer las estrategias no solo de salud laboral, sino también de prevención de desastres, buscando un perfeccionamiento en las estrategias, evitando un impacto negativo para la salud, para la seguridad y para el medio ambiente de cada persona.
Conociendo la importancia de generar lugares de trabajo sanos y seguros para los trabajadores y dando cumplimiento a la normatividad legal vigente en materia de Seguridad y Salud en el Trabajo se plantea la necesidad de inspeccionar y verificar los lugares de trabajo en los que se estuvieron desarrollando las labores durante el tiempo de pandemia y aún más en la actualidad en la que dicha modalidad de trabajo tomó fuerza y se quedó en nuestro país mediante la Ley 2088 de 2021 y el Decreto 649 de 2022 o migró a otras modalidades como el Teletrabajo, reglamentada por la Ley 1221 de 2008 y el Decreto 884 de 2012.
La discapacidad: De reto a oportunidad en la prevención de riesgos laborales
Authors: Moldes Diz Yolanda
Published: August 2023

En la actualidad se estima que solo en la Unión Europea hay más de 100 millones de personas que tienen algún tipo de discapacidad. Sin embargo, 3 de cada 4 personas con discapacidad en España no tienen empleo y en la mayoría de los casos es debido a entre otros factores a no disponer de un sistema de gestión de la prevención de riesgos laborales inclusivo. Entre las claves de la gestión inclusiva se encuentra: la adaptación de puestos de trabajo, la creación de una cultura organizacional inclusiva, entre otras. Un claro ejemplo de empresa inclusiva es la Organización Nacional de Ciegos Españoles (ONCE) dónde todos los trabajadores son iguales y dispone de un sistema de gestión certificado con la norma ISO 45001:2018.
Identificación de factores psicosociales en empresas del sector salud
Authors: González Gil Edgar Javier , Osorio Ordoñez Cristian Camilo , Rodríguez Leidy Yohana , Cano Acevedo Jessica , Rodríguez Martha Liliana
Published: August 2023

Las consecuencias de los factores de riesgo psicosociales en el personal del sector salud inciden de manera directa en su productividad, bienestar personal y en los entornos vitales donde se desenvuelve. Es así, como se convierten en uno de los riesgos más predominantes en este sector y otros con los que tenga relación. Esta investigación busca evidenciar las características en este aspecto en el sector salud mediante los análisis comparativos de 8 Instituciones Prestadoras de Salud (IPS) a nivel nacional donde se realizaron evaluaciones de factores de riesgo psicosocial con la herramienta denominada Batería para la Evaluación de Factores de Riesgo Psicosocial durante los años 2020 a 2021.
Se busca también observar si preexisten discrepancias esenciales en los resultados con lo descrito en la literatura de referencia mínima obligatoria como lo son los protocolos para intervención de factores de riesgo psicosocial promulgado por el Ministerio de Trabajo de Colombia (2015) y determinados como tal en la Resolución 2764 de 2022. Los riesgos psicosociales encontrados corresponden a: Características de la vivienda (86 %) y Situación económica del grupo familiar y de su entorno (71 %); Demandas emocionales (71 %); Desplazamiento vivienda-trabajo-vivienda        (71 %); Claridad del rol (64 %); Demandas ambientales de esfuerzo físico (64 %); capacitación (64 %); Características del liderazgo (57 %); Participación y manejo del cambio (57 %); Retroalimentación del desempeño (50 %); Relación con los colaboradores (50 %); Oportunidad para el uso y estilo de habilidades y conocimientos (50 %); Influencia del trabajo sobre el entorno extralaboral (50 %).
Exposición a radiaciones ionizantes en el personal de la salud, efectos y normatividad en Colombia
Authors: Cañón Benavides Lady Katherine
Published: August 2023

El personal de la salud durante su ejercicio laboral se encuentra expuesto constantemente a radiaciones ionizantes, en especial los colaboradores que se desempeñan en el área de radiología e imágenes diagnósticas, haciéndolos más propensos a sufrir efectos nocivos a corto y largo plazo, por ello se pueden presentar patologías graves que son totalmente prevenibles, se presenta un artículo de revisión para explicar teóricamente la definición de la radiación, efectos, medidas de control, normatividad en Colombia y en general los aspectos más relevantes.
HYPER-DIFFERENTIAL SENSITIVITY ANALYSIS FOR NONLINEAR BAYESIAN INVERSE PROBLEMS
Authors: Sunseri Isaac , Alexanderian Alen , Hart Joseph , Waanders Bart van Bloemen
Published: August 2023

We consider hyper-differential sensitivity analysis (HDSA) of nonlinear Bayesian inverse problems governed by partial
differential equations (PDEs) with infinite-dimensional parameters. In previous works, HDSA has been used to assess
the sensitivity of the solution of deterministic inverse problems to additional model uncertainties and also different types of measurement data. In the present work, we extend HDSA to the class of Bayesian inverse problems governed by PDEs. The focus is on assessing the sensitivity of certain key quantities derived from the posterior distribution. Specifically, we focus on analyzing the sensitivity of the MAP point and the Bayes risk and make full use of the information embedded in the Bayesian inverse problem. After establishing our mathematical framework for HDSA of Bayesian inverse problems, we present a detailed computational approach for computing the proposed HDSA indices. We examine the effectiveness of the proposed approach on an inverse problem governed by a PDE modeling heat conduction.
Biobased latex adhesives from isobornyl methacrylate and plant-oil-based acrylic monomers
Authors: Domnich Bohdan , Shevhcuk Oleg , Kirianchuk Vasylyna , Voronov Andriy
Published: August 2023

A range of cross-linkable latex copolymers with biobased content of up to 90% was synthesized from isobornyl methacrylate combined with acrylic monomers based on high-oleic soybean oil (HO-SBM) or camelina oil (CMM) through miniemulsion polymerization. By varying the HO-SBM and CMM macromolecular fractions, the cross-linking density of the resulting materials can be altered due to differences in the fatty acid profiles of the plant-oil-based monomers. The glass transition temperature of the synthesized copolymers correlates very well with the calculated Flory–Fox values. A higher cross-linking density of the biobased copolymer films leads to a notable growth in the modulus of the materials, while the elongation at break decreases due to more restricted macromolecular mobility. Remarkably, the copolymer with the highest unsaturation degree in the investigated range (based on CMM) shows an increase in both the modulus and elongation at break, due perhaps to extended entanglements of fatty-acid-based side chains. The adhesion performance of the cross-linked biobased copolymers was evaluated by performing shear and peel strength measurements on steel and polypropylene. Based on the obtained results, the unsaturation degree of CMM and HO-SBM (determined by plant oil composition) can be applied as a criterion for adjusting adhesion by choosing plant-oil-based monomers (or their mixtures) with different unsaturation degrees to achieve properties and performance required for specific applications.
Potential for construction statutory adjudication in Pakistan: taking lessons from the UK
Authors: Qadir Nouman , Brooks Tara , Quigg Edward
Published: August 2023

This study examines the UK’s statutory adjudication process to identify the possible benefits of the introduction of a similar system in Pakistan with the assumption of having the full support of all three wings of the Pakistani government for the resulting legislative reforms. The study of potential hurdles in detail is outside the scope of this study. A literature review, summarised within the paper, was undertaken to identify factors contributing to conflicts in Pakistan’s construction sector and the reasons behind the inefficiency of the present dispute resolution methods. Data were collected using nine semi-structured interviews of industry professionals from (both) Pakistan and the UK. Each interview was analysed through cognitive mapping and central and domain analysis using the Banxia Decision Explorer software. Later, a questionnaire asked professionals working with contractors/subcontractors in Pakistan regarding the potential success of the introduction of statutory adjudication in Pakistan. The preamble of the questionnaire defined the basics of statutory adjudication for the participants. The 70 valid responses received were then analysed using the Statistical Package for Social Sciences software. This research showed that payment issues are the biggest source of disputes in Pakistan’s construction sector. The financially weaker party is often subjugated to be deprived of its rights, mostly due to the absence of an accessible justice system. The introduction of statutory adjudication could be beneficial for Pakistan’s construction sector, as it will provide an accessible, cost-efficient and swift method of dispute resolution.
A new type of bridge structure reinforcement effect evaluation algorithm based on time series
Authors: Yin Zhiwei
Published: August 2023

A supplement method based on reusing the original bridge structure is suggested to expedite construction and reduce costs. Furthermore, theoretical analysis of the single pile bearing capacity is conducted, primarily involving the calculation of the bridge pile foundation settlement, horizontal resistance and axial bearing capacity. At the same time, considering that the time series data generated in the actual process often have characteristics of imbalance between classes, a cost-sensitive hybrid network model is also constructed. Its significance is the analysis of bridge reinforcement performance data. The experimental results show that compared with the cross-entropy loss function, the introduction of a cost-sensitive loss function can significantly improve the monitoring accuracy of abnormal data sets. The ACC– score, G-means and F-measures are higher than those of the specific cross-entropy loss function. The permissible bearing capacity of muddy clay determined using a network model complies with engineering standards in the evaluation of bridge reinforcement performance. As a result, the reliability of this form of reinforcement is improved.
Análisis bibliométrico de la producción científica sobre cooperativas agropecuarias en países hispanoparlantes
Authors: Camacho-Bercherlt Mirna , Rojas-Herrera Juan José , Santillán-Fernández Alberto
Published: August 2023

Las cooperativas agropecuarias son empresas sociales dedicadas a la producción, trasformación y comercialización de productos agrícolas, pecuarios y forestales. Su modelo empresarial-asociativo es poco conocido debido, entre otras causas, a su escasa difusión en medios impresos de carácter científico. Por tal razón, el objetivo del artículo consistió en analizar la evolución espacio-temporal de la producción científica sobre cooperativas agropecuarias en países hispanoparlantes, mediante un análisis bibliométrico que permitiera identificar los principales países, temas y alcance de las publicaciones. Se recopilaron 164 artículos científicos publicados entre 2001 y 2021, en los que la evolución espacio-temporal de la investigación mostró un crecimiento lineal (R2=0.47, P<0.001), concentrándose en Cuba y España, países en los que se ubican las tres revistas con mayor número de artículos publicados y de mayor impacto, medido por el número de citas bibliográficas. Tales revistas son: CIRIEC-España. Revista de economía pública, social y cooperativa; COODES. Cooperativismo y Desarrollo y REVESCO. Revista de Estudios Cooperativos. Los temas de mayor relevancia fueron: organización, cooperación y legislación. No obstante, existe poca vinculación entre la red de autores, lo que responde al hecho de que el estudio de las cooperativas agropecuarias representa un tema de investigación emergente, con amplitud y profundidad aún limitadas.
Mini Trampolin Antrenmanlarının Maksimum Oksijen Tüketim Kapasitesine Etkisinin İncelenmesi
Authors: KİRİŞCİ İlker , SERİN YAMAN Sevinç , KUMAK Aliasker
Published: August 2023

Çalışmanın amacı, mini trampolin antrenmanlarının maksimum oksijen tüketim kapasitesine etkisini araştırmaktır. İstanbul Gelişim Üniversitesi Beden Eğitimi ve Spor Yüksekokulu’ndaki mini trampolin antrenmanı yapan 18-24 yaş arası 12 erkek öğrenci (22±1,27 yaş, 68,85±8,24 kg, 174±6,07 cm) çalışmaya katılmaya gönüllü olmuştur. Katılımcıların boy ve kilo ölçümleri yapılıp, maksimum oksijen tüketim kapasitesi ölçümünün (30-15IFT) ardından 6 haftalık mini trampolin antrenmanı uygulamalarına başlanmıştır. Ölçümler, test ve antrenman uygulamaları ön test ve son test şeklinde tekrarlanarak veriler kaydedilmiştir. Normalliğin belirlenmesinde çarpıklık ve basıklık katsayıları dikkate alınmış ve verilerin (±,1,5 aralığında) normal dağıldığı görülmüştür. Analizlerde p
Yöneticiliği Tercih Eden Beden Eğitimi Öğretmenlerinin Yöneticiliği Tercih Etme Sebeplerinin İncelenmesi
Authors: ERDOĞAN Barbaros Serdar , BUYRUKOĞLU Erhan , BAYINDIR Melek
Published: August 2023

Araştırmamızda yöneticiliği tercih eden beden eğitimi öğretmenlerinin yöneticiliği tercih etme sebeplerinin incelenmesi amaçlanmıştır. Araştırma örneklemini Aydın genelinde 2022- 2023 eğitim öğretim yılında aktif olarak yönetici konumunda bulunan araştırmamıza gönüllü olarak katılan okul müdür ve müdür yardımcılarından oluşan toplam 182 beden eğitimi öğretmeni oluşturmaktadır. Araştırmamızda Köse (2008) in hazırlamış olduğu 30 madde 5 alt boyuttan (kendini gerçekleştirme ihtiyaçları, maddi ihtiyaçlar, sosyal ihtiyaçlar, saygı ihtiyaçları ve güvenlik ihtiyaçları) oluşan öğretmenlerin yöneticiliği tercihlerini belirlemeye yönelik ölçek kullanılmıştır. Araştırmamızda sonuç olarak; cinsiyet değişkeninde sosyal nedenler alt boyutunda istatiksel olarak anlamlı bir farklılık olduğu, eğitim değişkeninde saygı ihtiyaçları ve sosyal ihtiyaçlar alt boyutunda istatistiksel olarak anlamlı bir farklılık olduğu, beden eğitimi öğretmenlerinin sportif uzmanlık branşlarında alt boyutlarda istatistiksel olarak anlamlı bir farklılığın olmadığı, beden eğitimi öğretmenlerinin yönetici konumunda çalışmış oldukları okul türü değişkeninde istatistiksel olarak anlamlı bir farklılığın olmadığı, yöneticiliği tercih eden beden eğitimi öğretmenlerinin kıdem yıl değişkeninde ise sosyal ihtiyaçlar alt boyutunda istatistiksel olarak anlamlı bir farklılık olduğu görülmüştür.
Análisis de la inhibición de microorganismos proteolíticos en filetes de tilapia roja (Oreochromis spp) conservados con propóleo (Apis mellifera Linnaeus)
Authors: Intriago Mazamba Luis , Talledo Solórzano Viviana , Arteaga Solórzano Rudyard , Pazmiño Anderson , Cuenca Nevárez Gerardo
Published: August 2023

La industria alimentaria se centra en reemplazar los conservantes químicos con alternativas orgánicas para la conservación y seguridad de los alimentos. El presente estudio, busca analizar el uso de propóleo en la conservación de filetes de tilapia roja. Se aplicó propóleo en dos concentraciones (15% y 30%) y dos tiempos de impregnación (1,5 y 3 horas) a filetes de tilapia roja almacenados a 4-5°C durante 30 días. Se evaluaron varios parámetros, incluidos el pH, la capacidad de retención de agua (CRA) y la concentración básica de nitrógeno volátil (N-BVT), a intervalos de 10 días. Además, se realizó un análisis microbiológico de microorganismos mesófilos y E. coli presentes. A partir del día 20 se observaron diferencias significativas en el color del filete según las coordenadas cromáticas L*, a* y b*. El análisis sensorial mostró que las propiedades sensoriales se mantuvieron cuando los valores de aceptación fueron superiores a 6,5. El tratamiento más efectivo fue el propóleo en concentración del 15% con un tiempo de impregnación de 1,5 horas y conservado durante 20 días. Este enfoque mostró que el propóleo extiende efectivamente la vida útil de los filetes al prevenir el daño proteolítico. Además, inhibe la proliferación de microorganismos al mantener la carga de mesófilos y E. coli, así como los parámetros fisicoquímicos (pH, CRA y N-BVT) según la norma NTE-INEN 183-2013. En conclusión, el propóleo es un conservante orgánico prometedor para la industria alimentaria.
Análisis químico de aceites esenciales amazónicos de una comunidad Shuar ecuatoriana
Authors: Montalván Ruilova Mayra , Malagón Áviles Omar , Cumbicus Torres Nixon , Tinitana Imaicela Fani , Gilardoni Gianluca
Published: August 2023

La presente investigación se realizó con el propósito de determinar la composición química de los aceites esenciales de cuatro especies amazónicas del centro shuar Antuash en el cantón Morona, provincia de Morona Santiago; las cuales pertenecen a las principales familias aromáticas del Ecuador. Los aceites esenciales de Critoniopsis pycnantha (Benth.) H. Rob., Myrcia aliena McVaugh, Piper macrotrichum C. DC. y Siparuna schimpffii Diels, fueron obtenidos de las hojas secas mediante destilación analítica por arrastre de vapor, determinándose un rendimiento por peso con respecto a las hojas secas de 0,24%, 0,80%, 0,44% y 0,32%, respectivamente. Estos fueron analizados cualitativamente mediante cromatografía de gases acoplada a espectrometría de masas (GC-MS) y cuantitativamente mediante cromatografía de gases acoplada a detector de ionización de llama (GC-FID), con columna apolar DB-5ms. Se realizó la identificación de los compuestos en base a los espectros de masas y los índices de retención de Van Den Dool Kratz, y se cuantificó calculando los factores de respuesta relativos con base a las entalpías de combustión. Así se determinó riqueza en monoterpenos para el aceite de M. aliena y P. macrotrichum y riqueza en sesquiterpenos para el aceite de C. pycnantha y S. schimpffii. Los compuestos mayoritarios en el aceite esencial de C. pycnantha fueron g muuroleno, biciclogermacreno, (E)-cariofileno a-ylangeno y a-humuleno; para M. aliena a-pineno y b-pineno; para P. macrotrichum d-3-careno, eugenol y acetato de chavibetol; y, para S. schimpffii espatulenol, 2-undecanona, biciclogermacreno y (E)-Isocroweacina.