1,466 research outputs found
A population-based study on the immediate and prolonged effects of the 1999 Taiwan earthquake on mortality
No full textChamber Studies and Modeling of Secondary Organic Aerosol Formation
Get PDFSecondary organic aerosol (SOA), formed from atmospheric oxidation of gas-phase hydrocarbons, comprise a large fraction of ambient particulate matter. Significant uncertainties exist in identifying the sources and mechanisms responsible for SOA formation, making it difficult to understand its impact on global climate and local air quality. Laboratory chambers have been a valuable tool to study underlying chemical mechanisms of SOA formation and to quantify SOA formation from select hydrocarbons in a controlled environment. However, a good understanding of the chemical processes involved is required to be able to extrapolate data acquired from smog chamber studies. This thesis presents results from experimental investigation of SOA formation from atmospherically important compounds, and model simulations of kinetic mechanisms involved in SOA formation.
The distinguishing mechanism of SOA formation is the partitioning of semivolatile hydrocarbon oxidation products between the gas and aerosol phases. While SOA formation is typically described in terms of partitioning only, the rate of formation and ultimate yield of SOA can also depend on the kinetics of both gas- and aerosol-phase processes. Here a general equilibrium/kinetic model of SOA formation is presented to provide a framework for evaluating the extent to which the controlling mechanisms of SOA formation can be inferred from laboratory chamber data. Current atmospheric models systematically underpredict SOA formation, suggesting that in current models, 1) signicant SOA precursors could be missing and 2) SOA forming processes could be misrepresented. Aerosol formation from oxidation of 2-methyl-3-buten-2-ol (MBO) and polycyclic aromatic hydrocarbons (PAHs), two important classes of compounds previously assumed to be an insignicant SOA source, is studied. Upon photooxidation, MBO produces glyoxal (an important SOA intermediate), but the yields are too low to be atmospherically important. Photooxidation of napthalene and other 2-ring PAHs leads to substantial amounts of aerosol, and can account for a large fraction of SOA formed from oxidation of diesel exhaust and other primary emissions.
Isoprene is a signicant source of atmospheric organic aerosol; however, the oxidation pathways that lead to SOA have remained elusive. Under remote low-NOx conditions, epoxydiols are formed from gas-phase photooxidation of isoprene, and are found to undergo reactive uptake to lead to low-volatility compounds, such as C5-methyltetrols and organosulfates observed in ambient particulate matter. Under urban high-NOx conditions, methacrolein, an important C4 aldehyde formed from isoprene oxidation, is found to form SOA via reaction with NO2 to form peroxy methacryloyl nitrate, which subsequently forms low-volatility oligoester products. As a result of radical chemistry of aldehydes, SOA formation from isoprene depends critically on the NO2/NO ratio, and the implications on ambient aerosol formation are discussed.</p
IMPLEMENTASI LAYANAN INFORMASI KARIR UNTUK MEMBANTU KESIAPAN PESERTA DIDIK DALAM PEMILIHAN KARIR DI SMA YP UNILA BANDAR LAMPUNG
No full textABSTRAK
Peneliti memperoleh gambaran bahwa peserta didik Di SMA
YP UNILA Bandar Lampung masih ada beberapa siswa yang masih
bingung tentang sekolah lanjutan setelah dari SMA dan juga
menentukan arah hidupnya atas apakah ingin melanjutkan
pendidikan ke perguruan tinggi atau bekerja. Berdasarkan hal
tersebut penulis tertarik untuk djudul “Implementasi Layanan
Informasi Karir Untuk Membantu Kesiapan Peserta Didik Dalam
Pemilihan Karir di SMA YP UNILA Bandar Lampung”. Adapun
Tujuan dari penelitian ini pertama, untuk mengetahui dan
manganalisis bagaimana Implementasi layanan informasi karir untuk
membantu kesiapan peserta didik dalam pemilihan karir di SMA YP
UNILA Bandar Lampung. Kedua, Untuk mengetahui dan
manganalisis apa saja hambatan-hambatan yang ada dalam
implementasi layanan informasi karir untuk membantu kesiapan
peserta didik dalam pemilihan karir di SMA YP UNILA Bandar
Lampung. Ketiga, Untuk mengetahui dan manganalisis seperti apa
hasil daripada implememtasi layanan informasi karir untuk
membantu kesiapan peserta didik dalam pemilihan karir di SMA YP
UNILA Bandar Lampung.
Metode Penelitian adalah pendekatan kualitatif, penelitian ini
termasuk kedalam jenis penelitian lapangan (field research).
Penelitian ini menggunakan teknik pengumpulan data berupa
wawancara, observasi dan dokumentasi. Data primer sumber data
yang didapat melalui wawancara dengan guru bimbingan dan
konseling. Data sekunder didapat melalui media perantara yang
dapat berupa dokuementasi dari responden yaitu guru bimbingan dan
konseling di SMA YP UNILA Bandar Lampung. Penelitian ini
dilaksanakan mulai dari perencanaan yang berupa penyusunan RPL
(Rancangan Perencanaan Layanan). Kemudian dalam pelaksanaanya
pertama, kegiatan pendahuluan. Kedua, kegiatan inti dan ketiga,
kegitan penutup. Kemudian setelah selesai pelaksanaanya dilanjut
dengan tahap akhir yakni tahap evaluasi. Pada tahap evaluasi dalam
implementasi layanan informasi tentang karir untuk membantu
kesiapan peserta didik dalam pemilihan karir di SMA YP UNILA
Bandar Lampung dilakukan melalui dua tahap evaluasi yakni
evaluasi proses dan evaluasi hasil. Dimana Kedua jenis evaluasi ini
penting dalam memastikan efektivitas dan keberhasilan suatu
aktivitas atau proyek.
iv
Berdasarkan pada hasil penelitian yang dilakukan oleh peneliti
seputar Implementasi layanan informasi tentang karir untuk
membantu kesiapan peserta didik dalam pemilihan karir di SMA YP
UNILA Bandar Lampung tedapat hambatan dalam pelaksanaanya
berupa kurang akuratnya informasi yang didapat, kemudian
keberagaman karir dari tiapindividu peserta didik. Akan tetapi hasil
dari implementasi layanan informasi tentang karir untuk membantu
kesiapan peserta didik dalam pemilihan karir di SMA YP UNILA
Bandar Lampung yakni tentunya peserta didik dapat memperoleh
solusi dari layanan informasi karir terkait pemilihan karir mereka.
Kata Kunci : Implementasi, Layanan Informasi Karir, Peserta
Didik
v
ABSTRACT
The researcher obtained an illustration that there were still
some students at YP UNILA SMA Bandar Lampung who were still
confused about going to secondary school after high school and also
determining the direction of their life whether they wanted to
continue their education to college or work. Based on this, the
author is interested in the title "Implementation of Career
Information Services to Assist Students' Readiness in Career
Choices at SMA YP UNILA Bandar Lampung". The objectives of this
research are 1. To find out and analyze how career information
services are implemented to help students' readiness in choosing a
career at SMA YP UNILA Bandar Lampung. 2. To find out and
analyze what obstacles exist in implementing career information
services to help students' readiness in choosing a career at SMA YP
UNILA Bandar Lampung. 3. To find out and analyze the results of
implementing career information services to help students' readiness
in choosing a career at SMA YP UNILA Bandar Lampung.
The research method is a qualitative approach, this research
is included in the type of field research. This research uses data
collection techniques in the form of interviews, observation and
documentation. Primary data is a source of data obtained through
interviews with guidance and counseling teachers regarding the
Implementation of Career Information Services to Assist Students'
Readiness in Career Choices at YP UNILA SMA Bandar Lampung.
Secondary data sources are obtained through intermediary media
which can be in the form of documentation from respondents,
namely guidance and counseling teachers at SMA YP UNILA
Bandar Lampung. This research was carried out starting from
planning in the form of preparing an RPL (Service Planning Plan).
Then in the first implementation, preliminary activities. Second, core
activities and third, closing activities. Then after completion of the
implementation, it continues with the final stage, namely the
evaluation stage. At the evaluation stage, the implementation of
career information services to help students' readiness in choosing a
career at SMA YP UNILA Bandar Lampung was carried out through
two evaluation stages, namely process evaluation and results
evaluation. Where these two types of evaluation are important in
ensuring the effectiveness and success of an activity or project.
Based on the results of research conducted by researchers
regarding the implementation of information services about careers
vi
to help students' readiness in choosing a career at SMA YP UNILA
Bandar Lampung, there are obstacles in its implementation in the
form of less accurate information obtained, then the diversity of
careers for each individual student. However, the result of
implementing information services about careers to help students'
readiness in choosing a career at YP UNILA High School Bandar
Lampung is that of course students can get solutions from career
information services regarding their career choices.
Keyword : Implementation, Career Information Services, Student
Yeast Particle Encapsulation of Scaffolded Terpene Compounds for Controlled Terpene Release
Get PDFTerpenes are naturally occurring compounds produced by plants that are of great commercial interest in the food, agricultural, cosmetic, and pharmaceutical industries due to their broad spectra of antibacterial, antifungal, anthelmintic, membrane permeation enhancement, and antioxidant biological activities. Applications of terpenes are often limited by their volatility and the need for surfactants or alcohols to produce stable, soluble (non-precipitated) products. Yeast particles (YPs) are hollow, porous microspheres that have been used for the encapsulation of terpenes (YP terpenes) by passive diffusion of terpenes through the porous YP cell walls. We here report the development of a second generation YP encapsulated terpene technology that incorporates the stimuli-responsive control of terpene release using biodegradable pro-terpene compounds (YP pro-terpenes). YP terpenes and YP pro-terpenes were both produced, in which high levels of carvacrol, eugenol, thymol and geraniol were encapsulated. The YP pro-terpenes show higher encapsulation stability than YP terpenes due to pro-terpenes being non-volatile solids at room temperature and stable in suspensions at neutral pH. YP pro-terpenes and YP terpenes were evaluated for biological activity in antibacterial, antifungal and anthelmintic assays. The YP pro-terpenes retained the full biological activity of the parent terpene compound
ELECTRONIC TRANSITIONS OF YTTRIUM MONOPHOSPHIDE
Get PDFElectronic transition spectrum of the yttrium monophosphide (YP) molecule in the visible region between 715 nm and 880 nm has been recorded using laser ablation/reaction free-jet expansion and laser induced fluorescence spectroscopy. The YP molecule was produced by reacting laser - ablated yttrium atoms with PH seeded in argon. Thirteen vibrational bands were analyzed and five electronic transition systems have identified, namely the [12.2] = 3 - X transition, [13.3] = 3 - X transition, [13.4] = 3 - X transition, [13.5] = 3 - X transition, and [13.4] = 2 - X transition. Least squares fits of the measured rotational lines yielded molecular constants for the ground and excited states. The ground state symmetry and the bond length r of the YP molecule have been determined to be a X state and 2.4413 respectively in this work. A molecular orbital energy level diagram has been used to help the assignment of the observed electronic states. This work represents the first experimental investigation of the spectrum of the YP molecule.Made available in DSpace on 2016-01-05T20:04:33Z (GMT). No. of bitstreams: 3
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Previous issue date: 2
A note on Condorcet consistency and the median voter
Get PDFWe discuss to which extent the median voter theorem extends to the domain of single-peaked preferences on median spaces. After observing that on this domain a Condorcet winner need not exist, we show that if a Condorcet winner does exist, then it coincides with the median alternative ('the median voter'). Based on this result, we propose two non-cooperative games that implement the unique strategy-proof social choice rule on this domain. --
居港權引發的憲法爭論
No full text通過對香港居民在內地所生子女的居港權訴訟的分析，本書探討香港與中國內地關係的法律和憲法問題。該案件在香港法院的訴訟及全國人大常委會的隨後解釋在香港受到極大的關注，並引起了很大的爭論。香港法院與人大常委會解釋法律的不同方式正是香港憲制中的兩種不同法律制度衝突的生動寫照。
在本書中，香港知名的法律專家和律師對該案件有關問題進行分析討論，並對解決這些問題，特別是《基本法》的解釋問題，提出一個可行的方法。本書同時收錄公眾對該案的迴響及有關的法律文件，藉以為香港特區第一個重大的憲法危機提供一個歷史記錄
Meningite por Haemophilus Influenzae: aspectos selecionados.
Get PDFTrabalho de Conclusão de Curso - Universidade Federal de Santa Catarina, Centro de Ciências da Saúde, Departamento de Pediatria, Curso de Medicina, Florianópolis, 198
The dispersion characteristics of the waves propagating in a spinning single-walled carbon nanotube
No full textAs the nano-motor becomes a mechanical reality, its prototype can be envisaged as nano-sized rotating machinery at a situation, albeit for different purposes, like that in the first half of the 20th century during which rotor dynamics has contributed to boosting machine power capacity. Accordingly, we take the benefit of hindsight to develop a classical framework of vibration analysis. Essentially, the equations of motion are formulated to cope with both the special carbon-nanotube properties and the first author's previously developed spinning beam formalism, establishing a model satisfactorily verified by some available molecular dynamics (MD) data and classical spinning beam results extracted from the literature. The model is inexpensive based on continuum mechanics as an alternative to the less-flexible MD method for simulating wave motion of the spinning single-walled carbon nanotube, yielding several interesting phenomena, including the fall-off and splitting of the wave characteristic curves and the unexpected gyroscopic phase property. Potential applications are proposed
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