bluuebunny/crossref_metadata_2025_split huggingface dataset:
PEMANFAATAN KITOSAN DARI LIMBAH CANGKANG BEKICOT (Achatina fulica) SEBAGAI ADSORBEN LOGAM BERAT SENG (Zn)
Authors: Victor M. Stevano , Andhika Bayu , Syauqiah Isna 
Published: March 2021

Abstrak- Telah dilakukan pemanfaatan cangkang bekicot (Achatina fulica) sebagai adsorben logam berat seng (Zn). Penelitian ini bertujuan untuk mengetahui jumlah kitosan yang didapat dari cangkang bekicot, dan mengetahui kemampuan adsorben kitosan dalam uji adsorpsi yang menggunakan sampel air yang tercemar seng (Zn). Pembuatan kitosan dari cangkang bekicot dilakukan dengan dua tahap yaitu tahap pembuatan kitosan dengan variasi ukuran kitosan 250 micron dan 355 micron. Tahap pembuatan kitosan terdiri dari pembuatan serbuk cangkang bekicot, deproteinasi, demineralisasi, depigmentasi dan deasetilasi. Tahap ke dua yaitu uji penyerapan kitosan terhadap logam berat seng (Zn) dengan variasi jumlah massa kitosan yang digunakan yaitu: 1 gram, 3 gram, 6 gram dan 9 gram. Sampel tersebut diuji dengan menggunakan Atomic Absorption Spectrophotometric (AAS) untuk mengetahui konsentrasi logam berat seng (Zn) yang terkandung di dalamnya. Hasil penelitian menunjukan bahwa kitosan yang didapat dari cangkang bekicot untuk ukuran 250 micron yang sebesar 95,27%, dan untuk ukuran 355 micron yaitu sebesar 96,18%. Daya serap optimum kitosan didapat pada kitosan berukuran 250 micron dengan massa kitosan 9 gram. Kata kunci: Adsorbsi, mikron, cangkang bekicot dan logam berat seng (Zn) Abstract- The used of snail shell (Achatina fulica) as adsorbent of heavy metals zinc (Zn). This study aims to determine the amount of chitosan derived from snail shells, and knowing the ability of chitosan adsorbent in adsorption tests using water samples were contaminated zinc (Zn). Preparation of chitosan from the shells of snails be done in two phases: the manufacture of chitosan with chitosan size variation of 250 micron and 355 micron. Production stage consists of the manufacture of chitosan powder snail shells, deproteinization, demineralization, depigmentasi and deacetylation. The second phase of the test chitosan absorption of heavy metals zinc (Zn) with a variation of the mass amount of chitosan that is used as follows: 1 gram, 3 grams, 6 grams and 9 grams. The sample is tested by using Atomic Absorption Spectrophotometric (AAS) to determine the concentration of heavy metals zinc (Zn) contained in it. The result showed that chitosan is obtained from the snail shell to the size of 250 microns, which equal to 95.27%, and for the size of 355 microns that is equal to 96.18%. Optimum absorption of chitosan obtained at chitosan measure 250 microns with a mass of 9 grams of chitosan. Keywords: Adsorption, micron, snail shells and heavy metals zinc (Zn).
PENGARUH PENGGUNAAN NANAS DAN UMBI POHON GADUNG SEBAGAI KOAGULAN TERHADAP KUALITAS BAHAN OLAHAN KARET RAKYAT
Authors: Praharnata Praharnata , Sulistyo Joko , Wijayanti Hesti 
Published: March 2021

Abstrak- Prakoagulasi lateks merupakan penggumpalan spontan lateks yang biasanya disebabkan oleh pengaruh asam, enzim dan bakteri. Bahan yang digunakan untuk mempercepat prakoagulasi sering dikenal sebagai koagulan. Beberapa penduduk di Kalimantan Selatan menggunakan beberapa koagulan alami yang tidak banyak dikenal seperti umbi akar pohon gadung dan tongkol nanas, sehingga dalam penelitian ini kami ingin mengkaji lebih dalam mengenai penggunaan koagulan alami ini, mengamati dan membandingkan kualitas karet yang dihasilkan. Percobaan dilakukan dengan melakukan pengamatan pada sampel lateks yang telah dicampurkan dengan koagulan yang telah divariasi, penelitian ini mencoba meniru cara pengolahan karet remah kering, sehigga sampel karet yang dibuat memiliki sifat teknis yang dapat diuji. Adapun uji yang dilakukan dalam penelitian ini antara lain; uji prakoagulasi dengan koagulan yang bervariasi, uji prakoagulasi dengan dosis koagulan yang divariasikan, uji prakoagulasi lateks dengan air sisa prakoagulasi awal dan uji sifat teknis karet. Dari hasil analisa sampel gadung diperoleh kadar nitrogen karet sebesar 0,22 %, Po 31, dan PRI 76, pada sampel nanas diperoleh kadar nitrogen sebesar 0,24%, Po 21,5 dan PRI 56. Kata kunci: Prakoagulasi, lateks, koagulan, enzim, bakteri Abstract- Latex precoagulation is a spontaneous clot of latex that is usually caused by the effects of acids, enzymes and bacteria. Materials used to make precoagulation faster known as a coagulant. Some people in South Kalimantan using some natural coagulant that is not widely known as a gadung tree root and pineapple cob, so in this study we wanted to examine more deeply about the use of this natural coagulant, observe and compare the quality of rubber produced. The experiments were performed by making observations on a sample of latex was mixed with a coagulant which has been varied, this study tried to imitate the dry crumb rubber processing, so the rubber samples that created has technical properties that can be tested. The tests performed in this study were precoagulation test with varying coagulant, precoagulation test with coagulant dose varied, latex precoagulation test with waste water of early precoagulation and test of the technical properties of the rubber. From the analysis of gadung sample obtained rubber nitrogen content of 0.22 %, Po 31, and the PRI 76, the pineapple samples obtained rubber nitrogen content of 0.24 %, 21.5 Po and the PRI 56. Keywords: Precoagulation, latex , coagulants , enzymes , bacteria
PENGARUH VARIASI KONSENTRASI ADSORBEN BIJI TREMBESI TERHADAP PENURUNAN KADAR LOGAM KROMIUM (Cr) TOTAL PADA LIMBAH INDUSTRI SASIRANGAN
Authors: Hayati Gusti Indah , Pertiwi Bunga , Ristianingsih Yuli 
Published: March 2021

Abstrak- Proses pembuatan kain sasirangan menghasilkan limbah cair yang berasal dari proses pewarnaan dan pencelupan kain. Salah satu polutan yang terkandung pada limbah cair industri sasirangan adalah logam Cr. Reduksi logam Cr total limbah cair industri sasirangan dilakukan dengan proses adsorpsi menggunakan adsorben dari biji Trembesi. Tujuan penelitian ini untuk mengetahui pengaruh konsentrasi adsorben 1, 2, 3 dan 4% w/v terhadap proses reduksi logam Cr total industri sasirangan. Variasi konsentrasi adsorben yang digunakan sebesar 1 g/100 mL, 2 g/100 mL, 3 g/100 mL dan 4 g/100 mL limbah sasirangan dengan pengadukan selama 30 menit pada 100 rpm suhu 55oC dengan ukuran adsorben 250 mikron. Proses pirolisis berlangsung selama 5 jam dengan suhu operasi 450oC. Adsorben diaktifkan menggunakan HCl 0,1 N yang berlangsung selama 24 jam. Analisa yang dilakukan yaitu ICP (Inductively Coupled Plasma) untuk mengetahui kadar logam yang masih tersisa didalam limbah setelah dilakukannya proses adsorpsi. Semakin banyak jumlah adsorben yang ditambahkan maka penurunan konsentrasi logam Cr dalam air limbah semakin besar. Hasil penelitian diperoleh penurunan konsentrasi logam Cr maksimum sebesar 82,65%. Konsentrasi logam Cr mula-mula pada limbah cair kain sasirangan sebesar 2 ppm dan penurunan konsentrasi logam Cr maksimum pada penambahan adsorben 2 g sebesar 0,347 ppm. Kata kunci: biji Trembesi, logam Cr, pirolisis. Abstract- The production process of sasirangan fabric produced liquid waste from dyeing and coloring process. One of the pollutant that contained in liquid waste was chrom metal. Reduction of Cr metal from sasirangan industrial liquid waste used tamarind (trembesi) seeds as the adsorbent. The purpose of this research was to know the effect of adsorbent concentration 1; 2; 3 and 4 % w/v to reduction of Cr metal in sasirangan industry. Variation of adsorbent concentration that used 1 g/100 ml, 2 g/100 ml, 3 g/100 ml and 4 g/100 ml Sasirangan liquid waste by stirring for 30 minutes in 100 rpm at 55oC and the size of adsorbent was 250 micron. The pyrolisis process had setting at 450oC temperatures for 5 hours operation. Adsorbent was activated by HCl 0.1N for 24 hours. Chrom metal residu which contained in sasirangan waste was analyzed using ICP (inductively coupled plasma). This analysis aims to determine residual chrom metal concentration in sasirangan industries after adsorption process. The greater adsorbent was added at adsorption process, the less residual chrom metal concentration which contained in sasirngan waste. The results of this research showed that adsorbent can decrease Cr metal up to 80.65%. The initial concentration of Cr metal in sasirangan waste was 2 ppm and the decreasing of Cr metal maximum remaining was 0.347 ppm at 2 g adsorbent.Keywords: Tamarind seeds, Cr metal, pyrolisis.
PENGARUH METODE AKTIVASI PADA KEMAMPUAN KAOLIN SEBAGAI ADSORBEN BESI (Fe) AIR SUMUR GARUDA
Authors: Wulan Sari Tirta Indah , Muhsin Muhsin , Wijayanti Hesti 
Published: March 2021

Abstrak- Kaolin adalah mineral yang terdapat pada batuan sedimen dikenal dengan nama batu lempung. Kaolin banyak diaplikasikan di industri seperti kertas, keramik, karet, plastik, cat, fibergelas, dan kosmetik. Penelitian ini bertujuan untuk mengetahui pengaruh metode aktivasi terhadap kemampuan kaolin sebagai adsorben. Penelitian dilakukan dengan cara pengaktivasian kaolin secara fisika, kimia, dan kimia-fisika. Aktivasi fisika dilakukan dengan pemanasan kaolin pada suhu 700oC di dalam furnace selama 30 menit dan untuk aktivasi kimia dilakukan penambahan HCl 0,25 M pada kaolin disertai pengadukan dengan kecepatan 200 rpm selama 60 menit sedangkan untuk aktivasi kimia-fisika dilakukan penambahan HCl 0,25 M pada kaolin kemudian dilanjutkan pemanasan di dalam furnace pada suhu 700oC. Pengaktivasian kaolin ini untuk menghasilkan adsorben yang mampu menyerap ion besi (Fe) secara optimum. Dari penelitian ini, aktivasi yang optimum diperoleh untuk kaolin dalam mengadsorpsi Fe adalah aktivasi kimia. Adsorben kaolin yang teraktivasi kimia mempunyai daya adsorpsi yang besar terhadap ion Fe yaitu menghasilkan penurunan kandungan ion besi (Fe) menjadi sebesar 0,04 mg/L. Kata kunci: Aktivasi, hydrous alumunium silicate, adsorben, besi Abstract- Kaolin is a mineral found in sedimentary rocks known as clay stone. Kaolin widely applied in industries such as paper, ceramics, rubber, plastics, paint, glassfiber, and cosmetics. This study aimed to determine the effect on the ability of kaolin activation methods as adsorbent. The study was conducted by activation of kaolin in physics, chemistry, and chemistry-physics. Physical activation was done by heating kaolin at 700 ° C in a furnace for 30 minutes and for the chemical activation, the addition of 0.25 M HCl in kaolin with stirring speed of 200 rpm for 60 minutes, while the chemical-physical activation, the addition of 0.25 M HCl to the kaolin and continued warming in furnace at 700 ° C. The kaolin activation was to produce an adsorbent that is able to absorb iron (Fe) optimally. From this study, the optimum activation obtained for kaolin in adsorbing Fe is the chemical activation. Chemical activated kaolin adsorbent having a large adsorption capacity of the ion Fe which resulted in decreased content of iron (Fe) to 0.04 mg / L. Keywords : Activation, hydrous alumunium silicate, adsorbent, iron
Environmental factors and psychomotor development in children up to the age of 3
Authors: Owsianowska Joanna , Wawrzynów Marta , Wieder-Huszla Sylwia , Zabielska Paulina , Kotwas Artur , Jurczak Anna , Karakiewicz Beata 
Published: March 2021

Abstract

Introduction
Chemical compounds and other pollutants found in the environment have a well-documented, adverse effect on the life and health of individuals. Those who are most vulnerable to toxic effects include prospective parents, pregnant women, foetuses, and young children. In Poland, both the prevention and early detection of developmental abnormalities is insufficient. The objective of the study was to analyse how the pre- and postnatal development of a child is affected by toxicants the mother has been exposed to.

Materials and methods
The study was conducted in the form of a diagnostic survey. The degree of toxic exposure was assessed based on Wawrzynów’s questionnaire, the Mothers’ Toxic Exposure Assessment Questionnaire’ (Kwestionariusz Oceny Narażenia Matek Dzieci na Toksyny – KONT-15). The evaluation of child development was based on the following psychometric tools: the Munich Functional Developmental Diagnostics (MFDD), the Speech (MM-speech) and Reflex (MM-reflexes) Development Questionnaire, IRMIK (Inwentarz Rozwoju Mowy i Komunikacji) – the Polish adaptation of the MacArthur-Bates Communication Development Inventories (CDI), and the Child Development (RD-18) questionnaire, also designed by Wawrzynów.

Results
The study included 102 mothers of children up to 3 years of age. Most of the surveyed mothers indicated large urban agglomerations with more than 100,000 inhabitants as their current place of residence. The study demonstrated that a substantial majority of the mothers had come into contact with toxicants. A statistically significant relationship was demonstrated between developmental delays in children and high exposure to toxins in mothers. There was no statistically significant relationship between maternal exposure to toxins and delays in the development of speech and reflexes.

Conclusions
Environmental pollutants found primarily in air, food, medication, and everyday items, exert a negative influence on childhood development. A high maternal exposure to toxins contributes to developmental delays in speech and reflexes in children. Delays in speech and communication development were observed more frequently in children who were older. Developmental delays in children were more common among younger children.
Enhanced Recovery of Nanoconfined Oil in Tight Rocks Using Lean Gas (C2H6 and CO2) Injection
Authors: Baek Seunghwan , Akkutlu I. Yucel 
Published: March 2021

SummaryOrganic matters in source rocks store oil in significantly larger volume than that based on its pore volume (PV) due to so-called nanoconfinement effects. With pressure depletion and production, however, oil recovery is characteristically low because of the low compressibility of the fluid and amplified interaction with pore surface in the nanoporous material. For the additional recovery, CO2 injection has been widely adopted in shale gas and tight oil recovery over the last decades. But its supply and corrosion are often pointed out as drawbacks. In this study, we propose ethane injection as an alternative enhanced oil recovery (EOR) strategy for more productive oil production from tight unconventional reservoirs. Monte Carlo (MC) molecular simulation is used to reconstruct molecular configuration in pores under reservoir conditions. Further, molecular dynamics (MD) simulation provides the basis for understanding the recovery mechanism of in-situ fluids. These enable us to estimate thermodynamic recovery and the free energy associated with dissolution of injected gas. Primary oil recovery is typically below 15%, indicating that pressure depletion and fluid expansion are no longer effective recovery mechanisms. Ethane injection shows 5 to 20% higher recovery enhancement than CO2 injection. The superior performance is more pronounced, especially in nanopores, because oil in the smaller pores is richer in heavy components compared to the bulk fluids, and ethane molecules are more effective in displacing the heavy hydrocarbons. Analysis of the dissolution free energy confirms that introducing ethane into reservoirs is more favored and requires less energy for the enhanced recovery.
Association Between Body Composition and Pulmonary Function Tests Among Health Care Workers in Iran
Authors: Pouragha Hamidreza , Kazemi Hosein , Pouryaghoub Gholamreza , Mehrdad Ramin 
Published: March 2021

Background:
Why is bodyweight not a predictor of lung function, while height, sex,
race, and age are predictors of lung capacity and function? In this study, we want to investigate the
association between body composition and pulmonary function. And, as much as possible, answer
the question of why bodyweight is not predictive of lung function.

Methods:
This cross-sectional study was performed among 2967 employees of Tehran University
of Medical Sciences (TUMS) who participated in the TUMS Employees Cohort (TEC) study. The
body composition of the participants was measured using the Bioelectrical Impedance Analysis (BIA)
method. Anthropometric variables were also measured as a confounder. The pulmonary function
of participants was assessed by a forced spirometry test.

Results:
The correlation of BIA values including fat-free mass and total body water with a pulmonary
function such as FEV1, FVC, and FEF25-75is higher than most anthropometric values such as
weight, wrist circumference, and the waist to hip ratio. Also, in regression analysis, age and sex
had an association with pulmonary function, but the weight did not show a significant relationship.
On the other hand, fat-free mass and visceral fat were significantly associated with pulmonary function.
One is direct and the other is inverse.

Conclusion:
We observed a negative association between visceral fat and pulmonary function tests
and a direct association between Fat-free mass pulmonary function tests (FEV1 and FVC) adjusted
for age, sex, and anthropometric indices.
Influences on the Uptake of Health and Well-being Apps and Curated App Portals: Think-Aloud and Interview Study
Authors: Szinay Dorothy , Perski Olga , Jones Andy , Chadborn Tim , Brown Jamie , Naughton Felix 
Published: March 2021

Background
Health and well-being smartphone apps can provide a cost-effective solution to addressing unhealthy behaviors. The selection of these apps tends to occur in commercial app stores, where thousands of health apps are available. Their uptake is often influenced by popularity indicators. However, these indicators are not necessarily associated with app effectiveness or evidence-based content. Alternative routes to app selection are increasingly available, such as via curated app portals, but little is known about people’s experiences of them.

Objective
The aim of this study is to explore how people select health apps on the internet and their views on curated app portals.

Methods
A total of 18 UK-based adults were recruited through social media and asked during an in-person meeting to verbalize their thoughts while searching for a health or well-being app on the internet on a platform of their choice. The search was then repeated on 2 curated health app portals: the National Health Service Apps Library and the Public Health England One You App portal. This was followed by semistructured interviews. Data were analyzed using framework analysis, informed by the Capability, Opportunity, Motivation-Behavior model and the Theoretical Domains Framework.

Results
Searching for health and well-being apps on the internet was described as a minefield. App uptake appeared to be influenced by participants’ capabilities such as app literacy skills and health and app awareness, and opportunities including the availability of apps, app esthetics, the price of an app, and social influences. Motivation factors that seemed to affect the uptake were perceived competence, time efficiency, perceived utility and accuracy of an app, transparency about data protection, commitment and social identity, and a wide range of emotions. Social influences and the perceived utility of an app were highlighted as particularly important. Participants were not previously aware of curated portals but found the concept appealing. Curated health app portals appeared to engender trust and alleviate data protection concerns. Although apps listed on these were perceived as more trustworthy, their presentation was considered disappointing. This disappointment seemed to stem from the functionality of the portals, lack of user guidance, and lack of tailored content to an individual’s needs.

Conclusions
The uptake of health and well-being apps appears to be primarily affected by social influences and the perceived utility of an app. App uptake via curated health app portals perceived as credible may mitigate concerns related to data protection and accuracy, but their implementation must better meet user needs and expectations.
Gobernanza territorial en las protecciones institucionales alimentarias. Aproximaciones desde las DO del café en México
Authors: Martínez Salvador Laura Elena , De Jesús Contreras Daniel 
Published: March 2021

Objetivo: analizar, a partir de una serie de elementos de la gobernanza territorial, los procesos de gestión y aprovechamiento de las denominaciones de origen (DO) Café Chiapas y Café Veracruz, con el fin de identificar el potencial de estas figuras de protección en el desarrollo territorial. Diseño metodológico: para el análisis de los elementos de la gobernanza territorial en las denominaciones de origen conformadas alrededor de bienes alimentarios, se realizó un estudio de caso múltiple, de tipo cualitativo, enfocado en comprender los mecanismos de gobernanza territorial y se complementó con un análisis sistemático de información secundaria.Resultados: las DO de café, en ambos casos, muestran un nivel de institucionalización consolidado, y constituyen estrategias de revalorización de bienes alimentarios con anclaje territorial, con incidencia normativa, cuya institucionalización implica una serie de procesos de gobernanza territorial y articulación de stakeholders.Limitaciones de la investigación: el estudio de caso, pese a que se enfoca en las dos principales entidades productoras de café, no permite realizar generalizaciones sobre un fenómeno social por lo que, una ventana de oportunidad para entender más profundamente este tema se obtendría incluyendo las demás do alimentarias en México.Hallazgos: la instauración de las do es tan solo un primer paso hacia el reconocimiento del valor cultural de los alimentos y el aprovechamiento de los recursos para el desarrollo territorial.
Relasi FPI dengan Dayah dalam Penegakan Syari’at Islam di Aceh
Authors: Pasha Karim Zahlul 
Published: March 2021

This article attempts to answer why FPI's relationship with Dayah in Aceh is so close. This condition is seen in contrast to several other areas in Indonesia that are seen to experience frequent collisions. This article shows that the relations between FPI and Dayah groups in Aceh occurred for several reasons: first, the FPI organization in Aceh was led by Dayah people and used the Dayah santri network as a mass base. When FPI entered Aceh, the idea was rejected by some senior Acehnese scholars. After FPI succeeded in approaching young people from the Dayah circles, such as Muslem Attahiry, FPI's progress was seen to be very strong and succeeded in establishing its influence in some Dayah. Second, FPI in Aceh has the right space on the issue they are raising, namely Islamic Syari'at. Politicians who need an image of taking sides with shari'ah need to use FPI, either directly or indirectly. Third, the character of Acehnese people who are fanatical and like religious symbols so they don't care less about FPI's background. The people of Aceh will accept it as long as they (FPI) wrap their actions and agendas with narratives and religious symbols.
Abstrak
Artikel ini berusaha menjawab pertanyaan tentang mengapa hubungan FPI dengan Dayah di Aceh sangat dekat. Kondisi ini terlihat kontras dengan beberapa daerah lain di Indonesia yang terlihat sering mengalami benturan. Artikel ini menunjukkan bahwa relasi FPI dengan kalangan Dayah di Aceh terjadi karena beberapa sebab: pertama, organisasi FPI di Aceh dipimpin oleh orang Dayah dan menggunakan jaringan santri Dayah sebagai basis massa. Awal FPI masuk ke Aceh, idenya sempat ditolak oleh sejumlah ulama senior Aceh. Setelah FPI berhasil mendekati orang-orang muda dari kalangan Dayah, seperti Muslem Attahiry, kiprah FPI terlihat amat kuat dan berhasil menancapkan pengaruhnya di sejumlah Dayah. Kedua, FPI di Aceh memiliki ruang yang tepat pada isu yang mereka angkat, yaitu syari’at Islam. Politisi yang perlu citra keberpihakan pada syari’at perlu menggunakan FPI, baik secara langsung atau tidak langsung. Ketiga, karakter masyarakat Aceh yang fanatik dan menyukai simbol-simbol keagamaan sehingga kurang peduli dengan latar belakang FPI. Masyarkat Aceh akan menerima sejauh mereka (FPI) membungkus aksi dan agenda mereka dengan narasi-narasi dan simbol-simbol agama.