Preparation of Graphite Targets in the Gliwice Radiocarbon Laboratory for AMS 14C Dating

A line for preparation of graphite targets for accelerator mass spectrometry (AMS) radiocarbon dating has been built in the Gliwice 14C Laboratory. The AMS 14C measurements of our targets are performed in the Leibniz-Labor für Altersbestimmung, Kiel, Germany. The quality of our line has been tested in two series of AMS 14C measurements of background and Ox-II standard samples and by measurements of the amount of CO2 released during combustion of sample-free quartz tubes. Most background contamination in the first series was introduced during combustion, which has been greatly reduced by baking quartz tubes vacuum-sealed with CuO and Ag. The residual contamination (ca. 1.5 μg C) seems to come mostly from the quartz tubes themselves. At present, most of the contamination of the background is introduced during graphitization. The reproducibility of background preparations is satisfactory, especially for samples larger than 1.5 mg, when it is better than ± 0.09 pMC. Despite still significant contamination with low-14C carbon during the graphitization process (corresponding to 1.2 ± 0.2% of 14C-free carbon), the good reproducibility of the results allows us to use our line in routine 14C dating.

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U-Th vs. AMS 14C dating of shells from the Achenheim loess (Rhine Graben)

BSGF - Earth Sciences Bulletin ◽

10.2113/176.3.249 ◽

2005 ◽

Vol 176 (3) ◽

pp. 249-255 ◽

Cited By ~ 7

Author(s):

Christophe Innocent ◽

Christine Flehoc ◽

Francis Lemeille

Keyword(s):

14C Dating ◽

Average Value ◽

Rhine Graben ◽

Younger Age ◽

Isochron Diagram ◽

Dating Method ◽

Thorium 232 ◽

Ams 14C Dating ◽

Good Agreement

Abstract Shells extracted from loess deposits at Achenheim (Rhine Graben) have been investigated for AMS 14C and for U-Th dating by the isochron method on single shells. The two chronometers provide results that are not in agreement : the obtained 14C date is 38 ka B.P. In contrast, U-Th results provide much older ages. The 238U/232Th –230Th/232Th isochron diagram gives an age of 69 kyr, whereas a slightly younger age of 64 kyr is derived from the other, 234U/232Th – 230Th/232Th, diagram. 234U/238U ratios have not been found to vary from a shell to another : the average value is 1.199, slightly higher than radioactive equilibrium. For both isochrons, the Y-axis intercept is slightly negative, which indicates that there is no evidence for a significant detrital component. Thorium 232 that is present in the shells is probably incorporated in the material. The negative intercepts suggest that the two ages have been probably “aged” resulting from a slight mobilisation of uranium. By constraining the Y-axis intercepts at 0, ages that are in good agreement from one to another, can be calculated at 60.9 kyr and 60.4 kyr, respectively. In both cases, the statistical quality of the alignment is only slightly deteriorated. Since U-Th ages are in agreement with stratigraphic data, in contrast to the 14C date, one may believe that they date the end of early diagenesis, with uranium trapping. In contrast, the AMS 14C date is either thought to reflect analytical limitations of AMS 14C dating for such type of material, or to date a younger geologic event. In this latter case, a possible hypothesis is that this event has triggered the slight opening of the 238U – 234U system. In any case, this study demonstrates once again that surface formations often tell such complex stories that only one single dating method cannot usually be sufficient to describe precisely these histories. Instead, informations derived from different independent chronometers have to be compared.

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Ensuring Basic Quality in Clinical Courses

International Journal of Clinical Legal Education ◽

10.19164/ijcle.v1i0.131 ◽

2014 ◽

Vol 1 ◽

pp. 47 ◽

Cited By ~ 1

Author(s):

Roy Stuckey

Keyword(s):

Course Design ◽

Clinical Course ◽

Educational Quality ◽

Catholic University ◽

Initial Effort ◽

Clinical Program ◽

Basic Quality ◽

To Come ◽

Better Than

This article describes some of the features of clinical course design that are essential for ensuring basic educational quality. It does not attempt to be thorough. A number of years ago, I served on a committee that began discussing whether it is possible to come up with “indicia of quality” that could be used to measure the quality of a clinical program or course. The question that framed the issue was “If someone wanted to determine whether one school’s professional skills program is likely to be better than another school’s program, what elements should be examined?” The committee not only guessed that it was possible to define those elements, we also believed that it could be accomplished without a great deal of trouble. Though I still think it is possible to define indicia of quality, we were wrong that it would be easy. Our initial effort foundered fairly quickly. From time to time others renewed the effort, only to abandon the project, with one exception. Sandy Ogilvy, a law professor at Catholic University School of Law in Washington, D.C., is making the most serious effort to date to describe “indicia of quality” for clinical programs.

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Successful AMS 14C Dating of Non-Hydraulic Lime Mortars from the Medieval Churches of the Åland Islands, Finland

Radiocarbon ◽

10.1017/s0033822200045124 ◽

2010 ◽

Vol 52 (1) ◽

pp. 171-204 ◽

Cited By ~ 57

Author(s):

Jan Heinemeier ◽

Åsa Ringbom ◽

Alf Lindroos ◽

Árný E Sveinbjörnsdóttir

Keyword(s):

Direct Contact ◽

Radiocarbon Dating ◽

14C Dating ◽

Hydraulic Lime ◽

Ams Radiocarbon Dating ◽

Lime Mortars ◽

Ams Dating ◽

Chemical Testing ◽

Shed Light ◽

Ams 14C Dating

Fifteen years of research on accelerator mass spectrometry (AMS) radiocarbon dating of non-hydraulic mortar has now led to the establishment of a chronology for the medieval stone churches of the Åland Islands (Finland), where no contemporary written records could shed light on the first building phases. In contrast to other material for dating, well-preserved mortar is abundantly available from every building stage.We have gathered experience from AMS dating of 150 Åland mortar samples. Approximately half of them have age control from dendrochronology or from 14C analysis of wooden fragments in direct contact with the mortar. Of the samples with age control, 95% of the results agree with the age of the wood. The age control from dendrochronology, petrologic microscopy, chemical testing of the mortars, and mathematical modeling of their behavior during dissolution in acid have helped us to define criteria of reliability to interpret the 14C results when mortar dating is the only possibility to constrain the buildings in time. With these criteria, 80% of all samples reached conclusive results, and we have thus far been able to establish the chronology of 12 out of the 14 churches and chapels, while 2 still require complementary analyses.

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The Strange Case of the Ankhpakhered Mummy: Results of AMS 14C Dating

Radiocarbon ◽

10.1017/s0033822200048335 ◽

2013 ◽

Vol 55 (3) ◽

pp. 1403-1408

Author(s):

G Quarta ◽

S Malgora ◽

M D'Elia ◽

V Gaballo ◽

E Braione ◽

...

Keyword(s):

Mass Spectrometry ◽

Fourier Transform ◽

Accelerator Mass Spectrometry ◽

Radiocarbon Dating ◽

14C Dating ◽

Egyptian Mummy ◽

Ams Radiocarbon Dating ◽

Ancient Egyptian ◽

The University ◽

Ams 14C Dating

The ancient Egyptian mummy discovered in the wooden coffin of Ankhpakhered, priest of the god Min, has been studied at CEDAD (Centre for Dating and Diagnostics) at the University of Salento, Italy. The CT scan, performed by the multidisciplinary team of the Mummy Project of Milan, highlighted unusual features of the mummy, suggesting a reuse of the sarcophagus. Furthermore, specimens were taken via endoscopy for accelerator mass spectrometry (AMS) radiocarbon dating and Fourier transform infrared (FTIR) analyses, which have been carried out at CEDAD.

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AMS 14C Dating of Materials Recovered from the Tunnel under the Temple of the Feathered Serpent in Teotihuacan, Mexico

Radiocarbon ◽

10.1017/rdc.2016.77 ◽

2016 ◽

Vol 59 (2) ◽

pp. 545-557 ◽

Cited By ~ 1

Author(s):

S Gómez-Chávez ◽

C Solís ◽

J Gazzola ◽

E R Chávez-Lomelí ◽

M A Mondragón ◽

...

Keyword(s):

14C Dating ◽

Ams Radiocarbon Dating ◽

Archaeological Data ◽

First Results ◽

Ceramic Typology ◽

Work Done ◽

The Temple ◽

Teotihuacan Mexico ◽

Ams 14C Dating ◽

Made In

AbstractIn 2003, flooding occurred in the Ciudadela (Citadel) of Teotihuacan and saltpeter began to damage the Temple of the Feathered Serpent. Work done to solve this problem led to one of the most important archaeological discoveries made in this site in recent years: an intact tunnel sealed for more than a thousand years. The project created to study the tunnel was named Tlalocan or Path to the Underworld. More than 60,000 objects have been recovered after years of exploration and removing huge amounts of soil and stones. This paper presents the first results of accelerator mass spectrometry (AMS) radiocarbon dating performed on some of those materials recovered from the tunnel. With these findings, in combination with the archaeological data, based on stratigraphy and ceramic typology, a chronology of several events is proposed concerning the construction phases and ceremonial use, as well as partial and definitive closures of the tunnel. Every closure was accompanied by a deliberate and structured deposition of offerings and ritual refuse along the tunnel. The range of ages that covers the Bayesian calibration of samples collected along the tunnel is around 115 yr, from AD 125 to 240. Material collected at the surface of the chamber located at the end of the tunnel and under the pyramid gave ages in the interval between AD 400 and 534. All samples analyzed fall within the interval of time that covers the period of occupation of Teotihuacan.

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AMS 14C Dating of Romanesque Rotunda and Stone Buildings of a Medieval Monastery in Łekno, Poland

Radiocarbon ◽

10.1017/s0033822200055867 ◽

2009 ◽

Vol 51 (2) ◽

pp. 471-480 ◽

Cited By ~ 7

Author(s):

Andrzej M Wyrwa ◽

Tomasz Goslar ◽

Justyna Czernik

Keyword(s):

Radiocarbon Dating ◽

Firing Process ◽

Historical Sources ◽

14C Dating ◽

Central Poland ◽

Phases Of Development ◽

The Church ◽

Archaeological Excavations ◽

Ams 14C Dating ◽

Better Than

Archaeological excavations performed for many years in Łekno, central Poland, have exposed relicts of wooden fortified settlements, and in its enclosure also basements of stone buildings, consisting of Romanesque rotunda and a Cistercian monastery, including an oratory, church, and abbot's house. Earlier archaeological, structural, and stratigraphical studies have shown that these buildings were constructed in a sequence and represented several phases of development.In this paper, we present results of radiocarbon dating of stone buildings of the rotunda and the monastery. For 14C dating, we used tiny pieces of charcoal retrieved from calcareous and gypsum mortar binding stone elements from the buildings. These pieces were incorporated in mortar during the firing process, where the fuel used for firing was wood. Most of the obtained 14C dates formed clear groups, confirming that individual buildings were constructed in separate periods. Calibrated 14C dates of these phases agree well with the constraints provided by historical sources, and enable us to set their ages with accuracy better than previously available. In particular, we have learned that the oldest rotunda was built at the boundary of the 10/11th centuries, and the church and the abbot's house, before AD 1250. However, some samples gave much too old 14C ages, clearly reflecting the use of old wood for firing. These problems were revealed only for samples from the rotunda and for the gypsum stone ornamental details.

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Kepuasan Masyarakat Terhadap Pelayanan Kelurahan Setelah Pemekaran Di Tangerang Selatan

Liquidity ◽

10.32546/lq.v2i2.117 ◽

2018 ◽

Vol 2 (2) ◽

pp. 151-159

Author(s):

Pitri Yandri

Keyword(s):

Public Perception ◽

Service Personnel ◽

Urban Services ◽

Hospitality Workers ◽

Care Workers ◽

Before And After ◽

Cartesian Diagram ◽

Better Than

The purpose of this study is (1) to analyze public perception on urban services before and after the expansion of the region, (2) analyze the level of people's satisfaction with urban services, and (3) analyze the determinants of the variables that determine what level of people's satisfaction urban services. This study concluded that first, after the expansion, the quality of urban services in South Tangerang City is better than before. Secondly, however, public satisfaction with the services only reached 48.53% (poor scale). Third, by using a Cartesian Diagram, the second priority that must be addressed are: (1) clarity of service personnel, (2) the discipline of service personnel, (3) responsibility for care workers; (4) the speed of service, (5) the ability of officers services, (6) obtain justice services, and (7) the courtesy and hospitality workers.

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Implementasi Voip Server Berbasis IPV6 Dengan Raspberry PI

Manutech : Jurnal Teknologi Manufaktur ◽

10.33504/manutech.v9i01.32 ◽

2019 ◽

Vol 9 (01) ◽

pp. 47-54

Author(s):

Rabbai San Arif ◽

Yuli Fitrisia ◽

Agus Urip Ari Wibowo

Keyword(s):

Internet Protocol ◽

Wireless Transmission ◽

Raspberry Pi ◽

Test Results ◽

Average Delay ◽

Ipv6 Network ◽

Ip Network ◽

Selection Of ◽

Better Than

Voice over Internet Protocol (VoIP) is a telecommunications technology that is able to pass the communication service in Internet Protocol networks so as to allow communicating between users in an IP network. However VoIP technology still has weakness in the Quality of Service (QoS). VOPI weaknesses is affected by the selection of the physical servers used. In this research, VoIP is configured on Linux operating system with Asterisk as VoIP application server and integrated on a Raspberry Pi by using wired and wireless network as the transmission medium. Because of depletion of IPv4 capacity that can be used on the network, it needs to be applied to VoIP system using the IPv6 network protocol with supports devices. The test results by using a wired transmission medium that has obtained are the average delay is 117.851 ms, jitter is 5.796 ms, packet loss is 0.38%, throughput is 962.861 kbps, 8.33% of CPU usage and 59.33% of memory usage. The analysis shows that the wired transmission media is better than the wireless transmission media and wireless-wired.

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Motilitas dan Vabilitas Spermatozoa Ayam Kampung pada Suhu 5°C Menggunakan Pengencer dan Lama Simpan yang Berbeda

Jurnal Ilmu dan Teknologi Peternakan Tropis ◽

10.33772/jitro.v5i3.7242 ◽

2018 ◽

Vol 5 (2) ◽

pp. 102

Author(s):

Enike Dwi Kusumawati ◽

Selvinus Lawu Woli ◽

Aju Tjatur Nugroho Krisnaningsih ◽

Waluyo Edi Susanto ◽

Syam Rahadi

Keyword(s):

Data Analysis ◽

Storage Temperature ◽

Coconut Water ◽

Laboratory Research ◽

Ringer Lactate ◽

Randomized Design ◽

Native Chicken ◽

Lactate Solution ◽

Better Than

ABSTRAKPenelitian ini dilakukan untuk mengetahui motilitas dan viabilitas spermatozoa ayam kampung pada suhu 5oC menggunakan pengencer dan lama simpan yang berbeda. Metode yang digunakan dalam penelitian ini adalah penelitian laboratorium menggunakan Rancangan Acak Lengkap (RAL) Faktorial dengan pengencer ringer lactat solution, air kelapa dan tanpa pengencer serta lama simpan 0, 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, masing-masing diulang 10 kali. Variabel yang diamati yaitu motilitas dan viabilitas spermatozoa. Analisa data yang digunakan adalah analisis varian. Hasil analisis data menunjukkan bahwa motilitas dan viabilitas spermatozoa menggunakan pengencer ringer lactat solution lebih tinggi (P<0,01) serta dapat bertahan sampai lama simpan 24 jam dibandingkan air kelapa dan tanpa pengencer. Adapun nilai motilitas ringer lactat solution, air kelapa dan tanpa pengencer pada lama simpan 24 jam masing-masing sebesar 43,5±17,17%; 8±4,83%; 6,5±2,4%, sedangkan nilai viabilitasnya sebesar 83,2±7,25%; 64,6±3,20%; dan 63,1±2,33%. Kesimpulan dari hasil penelitian ini adalah ringer lactat solution lebih baik dibandingkan air kelapa dan tanpa pengencer dalam mempertahankan kualitas semen ayam kampung pada suhu simpan 5oC sampai lama simpan 24 jam.Kata Kunci : air kelapa, ayam kampung, motilitas, spermatozoa, viabilitas ABSTRACTThis study was conducted to determine the motility and viability of spermatozoa of Native chickens at 5oC using different diluents and time storage. The method used in this study was laboratory research using Factorial Completely Randomized Design with ringer lactate solution, coconut water and without diluent at 0, 3, 6, 9, 12, 15, 18, 21, 24, 27, 30 hours of time storage each repeated 10 times. The variables observed were motility and viability of sperm. Data analysis used is variance analysis. The results of data analysis showed that the motility and viability of spermatozoa using ringer lactate solution diluents was higher (P <0.05) than coconut water and without diluents. The motility values of ringer lactat solution, coconut water and without diluents were 43,5±17,17%; 8±4,83%; 6,5±2,4% respectively, while the viability values were 83,2±7,25%; 64,6±3,20% and 63,1±2,33%. The conclusion of this study is that ringer lactat solution is better than coconut water an without diluents in maintaining the quality of Native chicken semen at a storage temperature of 5oC until 24 hours.Keywords: coconut water, motility, native chicken, sperm, viability

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PERBANDINGAN KUALITAS PELAYANAN ANTARA PERPUSTAKAAN PROVINSI KEPRI DENGAN KOTA TANJUNG PINANG

Jurnal Benefita ◽

10.22216/jbe.v2i3.2318 ◽

2017 ◽

Vol 2 (3) ◽

pp. 288

Author(s):

Dimas Satriadi

Keyword(s):

Service Quality ◽

Public Service ◽

Quantitative Methods ◽

Quality Service ◽

Data Collecting ◽

Service Institution ◽

Better Than

The quality of public service is an important and it must have bye the each public service institution. Includes the library as a public service institution giving service for the all visitors. This research aims to know the comparisation of Kepri Province Libraries quality service and Tanjungpinang City Libraries quality service. The method used in this research is quantitative methods with questionnaire to 40 responden as samples. This questionnaire as an data collecting instruments. These results indicate the quality of two libraries is good. But, if they compared the service quality of Province Kepri Libraries is better than Tanjungpinang City Libraries. This look from average scored results is 152,61 points for Kepri Province Libraries, and 150,66 points for Tanjungpinang City Libraries, in the good categoriesKualitas pelayanan publik merupakan hal yang penting dan harus dimiliki oleh masing-masing lembaga pelayanan publik. Termasuk perpustakaan sebagai lembaga pelayanan publik yang memberikan pelayanan kepada semua pengunjung. Penelitian ini bertujuan untuk mengetahui perbandingan kualitas layanan Perpustakaan Provinsi Kepri dan kualitas pelayanan Perpustakaan Kota Tanjungpinang. Metode yang digunakan dalam penelitian ini adalah metode kuantitatif dengan 40 responden sebagai sampel. Kuesioner ini sebagai alat pengumpul data. Hasil penelitian ini menunjukkan kualitas kedua perpustakaan suda bagus. Tapi jika dibandingkan kualitas pelayanan Perpustakaan Provinsi Kepri lebih baik dari pada Perpustakaan Kota Tanjungpinang. Hasil dari hasil rata-rata ini adalah 152,61 poin untuk Perpustakaan Kepri Province, dan 150,66 poin untuk Perpustakaan Kota Tanjungpinang, dalam kategori baik.

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