Modeling Transport of Colloid-Bound Herbicides and Heavy Metals to Groundwater

Recent studies have suggested that contaminant transport to groundwater may be enhanced by association with colloidal particles. This study evaluated the role of water dispersible colloids with diverse mineralogical composition in co-transporting selected herbicides and heavy metals through intact soil columns. Colloid recovery in the eluents ranged from 45-90% for the herbicides and 10-60% for the heavy metals. The presence of colloids enhanced the transport of atrazine by 2-18%, and metolachlor by 8-30%. The corresponding increase for Cu and Zn was 2-150 and 5-30 times, respectively. For Pb, there was essentially no elution in the absence of colloids, suggesting nearly complete sorption by the column matrix and 8-3,000-fold increase in the presence of colloids. The extent of the colloid-induced transport was dependent on colloid, soil column, and contaminant properties. Colloid surface area and charge, pH, organic carbon, and soil macroporosity had a positive effect on co-transportability, while Fe and Al oxyhydroxides and kaolinite appeared to be inhibiting. Also inhibiting were \u3e 10 mg/L influent metal concentrations due to flocculation phenomena. In most cases, the increased transport of contaminants in the presence of colloids exceeded their sorption capacity, indicating the involvement of physical exclusion and binding mechanisms. This suggests that the colloids play a dual role as carriers and facilitators in the contaminant transport process

CODE-MIXING IN SPEAKING OF TENTH GRADE STUDENTS AT SMA N 1 METRO ACCADEMIC YEAR 2019/2020

Code-mixing is the use of two different languages in a sentence without changing the topic. The objectives of this research are to find out the types of code-mixing utilized in students speaking and to know the factors of code-mixing mostly occurred in students speaking. Due to covid-19, the researcher collects the data by using Triangulation: Participant Observation, In-depth Interview and Documentation through Zoom and WhatsApp Application. Analytical research is applied to analyze code-mixing in students speaking of tenth grade students at SMA N 1 Metro accademic year 2019/2020. The result shows that there are 23 out of 33 students use code-mixing in their speaking. It is found 45 code-mixing devided into three types including 21 Insertion which characterized by  inserting one or more Indonesian vocabularies into an English sentence, 19 Alternation which characterized by the existence of clause or sentence alternation between Indonesian and English, and 5 Congruent Lexicalization which characterized by the existence of dialect  from Indonesian inserted in students English Speaking. It is found that there are 4 factors of code-mixing namely interlocutor or the person whom they are talking to, culture or habit, confidence and lack of vocabulary

Reluctance of general practice staff to register patients without documentation: a qualitative study in North East London.

BACKGROUND: Lack of access to documentation is a key barrier to GP registration, despite NHS England guidance stating that documents are not required. Staff attitudes and practice regarding registration of those without documentation are under- researched. AIM: To understand the processes through which registration might be refused for those without documents, and the factors operating to influence this. DESIGN AND SETTING: Qualitative study conducted in general practice across three clinical commissioning groups in North East London. METHOD: In total, 33 participants (GP staff involved in registering new patients) were recruited through email invitation. Semi-structured interviews and focus groups were conducted. Data were analysed using Braun and Clarke's reflexive thematic analysis. Two social theories informed this analysis: Lipsky's street-level bureaucracy and Bourdieu's theory of practice. RESULTS: Despite good knowledge of guidance, most participants expressed reluctance to register those without documentation, often introducing additional hurdles or requirements in their everyday practice. Two explanatory themes were generated: that those without documents were perceived as burdensome, and/or that moral judgements were made about their deservedness to finite resources. Participants described a context of high workload and insufficient funding. Some felt that GP services should be restricted by immigration status, as is widespread in secondary care. CONCLUSION: Improving inclusive registration practice requires addressing staff concerns, supporting navigation of high workloads, tackling financial disincentives to registering transient groups, and challenging narratives that undocumented migrants represent a 'threat' to NHS resources. Furthermore, it is imperative to acknowledge and address upstream drivers, in this instance the Hostile Environment

Multiwavelength observation from radio through very-high-energy Gamma-ray of OJ 287 during the 12-year cycle flare in 2007

We performed simultaneous multiwavelength observations of OJ 287 with the Nobeyama Millimeter Array for radio, the KANATA telescope and the KVA telescope for optical, the Suzaku satellite for X-ray and the MAGIC telescope for very high energy (VHE) gamma-ray in 2007. The observations were conducted for a quiescent state in April and in a flaring state in November-December. We clearly observed increase of fluxes from radio to X-ray bands during the flaring state while MAGIC could not detect significant VHE gamma-ray emission from the source. We could derive an upper limit (95% confidence level) of 1.7% of the Crab Nebula flux above 150 GeV from about 41.2 hours of the MAGIC observation. A simple SSC model suggests that the observed flaring activity could be caused by evolutions in the distribution of the electron population rather than changes of the magnetic field strength or Doppler beaming factor in the jet.Comment: Contribution to the 31st ICRC, Lodz, Poland, July 200

Analisis Mutu, Produktivitas, Keberlanjutan Dan Arahan Pengembangan USAhatani Tembakau Di Kabupaten Temanggung, Jawa Tengah

Analysis of quality, productivity and sustainability anddevelopment direction of tobacco farming in TemanggungDistrict, Central JavaTemanggung tobacco is an important commodity for cigaretteindustry, farmers' income and product domestic regional brutto (PDRB)of Temanggung District. Tobacco stimulates economy activities, so that itcan grow other bussiness activities, such as transportation, agroproductand employment availability. Uncontrolled cultivation intensity andmarket structure monopsonistic resulted in weak bargaining position offarmer in marketing tobacco. Tobacco is a fancy product, it means that itsmarketing and transaction are very determined by quality. Theseconditions affected the sustainability of tobacco farm. This research wascarried out from January 2004 to March 2005 in the center of Temanggungtobacco production, which varies in terms of elevation, slope aspect andtopography. Temanggung tobacco varies in terms of quality andproductivity. Elevation and slope aspect were the primary factorsinfluencing tobacco productivity and quality. The quality of tobaccoplanted at farmer location at the elevation more than 1.000 m above sealevel (asl) with slope facing east, was significantly better than the qualityof tobacco planted at the elevation less than 1.000 m asl with slope facingnorth-east and north. The tobacco productivity planted on the slope facingeast differed significantly with the tobacco productivity planted on north-east and north slope facing. The slope did not significantly influencetobacco quality and productivity. Sustainability index of tobacco farmbelongs to enough category (IKb = 55.53 at scale of sustainability 0 –100)

Low density molecular gas in the galaxy

The distributions and physical conditions in molecular gas in the interstellar medium have been investigated in both the Galaxy and towards external galaxies. For example, Galactic plane surveys in the CO J =1-0 line with the Columbia 1.2-m telescope and with the Five College Radio Astronomy Observatory (FCRAO) 14-m telescopes have been able to trace spiral arms more clearly than HI surveys have been able to reveal, and indicate that most of molecular mass is contained in Giant Molecular Clouds (GMCs). Extensive maps of the whole Milky Way showed two prominent features, the 4-kpc molecular ring and the Galactic center. The physical conditions in the Galaxy have been studied by comparing the intensity of CO J =1-0 line with those of other lines, e.g., 13CO J =1-0, higher J transitions of CO, and dense gas tracers such as HCO+, CS, and HCN. Previous studies were however strongly biased towards regions where CO emission was known to be intense. The radial distribution of molecular hydrogen shows that most of the H2 gas which is indirectly traced by observations of its associated CO emission, originates from the inner Galaxy (Dame 1993). Extending outwards from a galacto-centric distance of ~7 kpc, the H2 mass surface density decreases dramatically, and HI dominates over H2 in the outer Galaxy. What are physical conditions of molecular gas where the CO emission is relatively weak, and can we really trace all of the molecular gas through obervations of CO? These kinds of problems have not been solved yet, but are addressed in our study

Utjecaj različitih površinski aktivnih tvari i njihovih koncentracija na kontrolirano oslobađanje kaptoprila iz polimernih matriksa

Various methods are available to formulate water soluble drugs into sustained release dosage forms by retarding the dissolution rate. One of the methods used to control drug release and thereby prolong therapeutic activity is to use hydrophilic and lipophilic polymers. In this study, the effects of various polymers such as hydroxypropyl methylcellulose (HPMC), ethylcellulose (EC) and sodium carboxymethylcellulose (CMC) and surfactants (sodium lauryl sulphate, cetyltrimethylammonium bromide and Arlacel 60) on the release rate of captopril were investigated. The results showed that an increase in the amount of HPMC K15M resulted in reduction of the release rate of captopril from these matrices. When HPMC was partly replaced by NaCMC (the ratio of HPMC/NaCMC was 5:1), the release rate of the drug significantly decreased. However, there was no significant difference in release rate of captopril from matrices produced with ratios of 5:1 and 2:1 of HPMC/NaCMC. The presence of lactose in matrices containing HPMC and NaCMC increased the release rate of captopril. It was interesting to note that although partial replacement of HPMC by EC reduced the release rate of the drug (ratio of HPMC/EC 2:1), the release rate was increased when the ratio of HPMC/EC was reduced to 1:1. The effects of various surfactants on the release rate of captopril from HPMC/EC 1:1 matrices were also investigated. The results showed that the surfactants did not significantly change the release rate of the drug. Release data were examined kinetically and the ideal kinetic models were estimated for the drug release. The kinetic analysis of drug release data from various formulations showed that incorporation of surfactants in HPMC/EC matrices did not produce a zero-order release pattern.Postoje različite metode formuliranja vodotopljivih lijekova u dozirane ljekovite oblike s polaganim oslobađanjem. Jedan od načina postizanja kontroliranog otpuštanja, a prema tome i produljenog učinka je upotreba hidrofilnih i lipofilnih polimera. U ovom radu proučavan je utjecaj različitih polimera poput hidroksipropil metilceluloze (HPMC), etilceluloze (EC) i natrijeve soli karboksimetilceluloze (NaCMC) i površinski aktivnih tvari (natrijevog lauril-sulfata, cetiltrimetilamonijevog bromida i Arlacela 60) na oslobađanje kaptoprila. Rezultati pokazuju da povećanje količine HPMC K15M ima za posljedicu smanjenje oslobađanja kaptoprila iz matriksa. Ako se HPMC djelomično zamijeni s NaCMC (omjer HPMC/NaCMC 5:1), oslobađanje ljekovite tvari značajno se smanjuje. Međutim, nema značajne razlike u oslobađanju kaptoprila iz matriksa s omjerom HPMC/NaCMC 5:1 i 2:1. Prisutnost laktoze u matriksu koji sadrži HPMC i NaCMC povećalo je oslobađanje kaptoprila. Iako djelomična zamjena HPMC s EC smanjuje oslobađanje ljekovite tvari (omjer HPMC/EC 2:1), oslobađanje se povećava uz omjer HPMC/EC 1:1. Nadalje, ispitivan je utjecaj površinski aktivnih tvari na oslobađanje kaptoprila iz matriksa u kojima je omjer HPMC/EC (1:1). Može se zaključiti da površinski aktivne tvari ne utječu značajno na oslobađanje ljekovite tvari. U sklopu istraživanja određen je i kinetički model oslobađanja kaptoprila. Analiza kinetičkih podataka ukazuje da dodatak površinski aktivnih tvari u HPMC/EC matrikse ne slijedi kinetiku nultog reda