Study of local flow conditions over a hemispherically blunted 25 deg cone for a shallow re-entry trajectory

Local flow conditions over hemispherically blunted 25 deg cone for shallow reentry trajector

Studi Penentuan Panjang Dan Kedalaman Retak Sambungan Las Pada Konstruksi Kapal Menggunakan Pengujian Ultrasonik Dengan Variasi Frekuensi Dan Ukuran Kristal Dan Variasi Kondisi Permukaan Coating Dan Uncoating

Ketidaksempurnaan dalam pengelasan diikuti dengan pengoperasian sering kali menimbulkan retak serta cacat-cacat dalam pengelasan pada sambungan las pondasi mesin di kapal yang telah dicat, pengujian ultrasonik dilakukan untuk mendeteksi lokasi retak tersebut tanpa membuang cat yang terdapat dipermukaan konstruksi. Pada tugas akhir ini dilakukan penelitian pada sambungan tumpul las sebanyak lima buah specimen dengan ukuran 400x200x12 mm dan pada setiap spesimen diberikan beberapa variasi ketebalan cat yaitu 0 mikron, 60 mikron, 120 mikron, 250 mikron, dan 300 mikron dimana sebelum diberikan variasi ketebalan cat terlebih dahulu diberikan retak buatan pada setiap specimen di daerah toe sambungan las dengan ukuran panjang 20 mm, 30 mm, 50 mm, dan 70 mm, dengan kedalaman 2 mm, 4 mm, 6 mm dan 8 mm, pengujian ultrasonik dilakukan dengan memvariasikan ukuran transducer yaitu 8 x 9 mm (2MHz), 20 x 22 mm (2MHz), dan 8 x 9 mm (4MHz). Setelah itu dilakukan pemeriksaan dengan menggunakan metode ultrasonik untuk membandingkan retak aktual dengan retak hasil scanning untuk panjang dan kedalaman retak. Hasil penelitian memperlihatkan bahwa semakin besar variasi ketebalan cat yang diberikan pada spesimen uji maka efektivitas pembacaan ukuran retak dengan menggunakan metode ultrasonik test akan menurun. Frekuensi transducer yang lebih besar memiliki kemampuan yang lebih sensitif untuk mendeteksi retak dan ukuran kristal transducer yang lebih besarakan lebih sensitif untuk mendeteksi retak dikarenakan penyebaran berkas suara yang lebih konstan. Dari ketiga jenis transducer yang paling akurat adalah 8 x 9 mm (4MHz)

Cost of inpatient rehabilitation care in the Department of Veterans Affairs

Abstract—We investigated the determinants of inpatient rehabilitation costs in the Department of Veterans Affairs (VA) and examined the relationship between length of stay (LOS) and discharge costs using data from VA and community rehabilitation hospitals. We estimated regression models to identify patient characteristics associated with specialized inpatient rehabilitation costs. VA data included 3,535 patients discharged from 63 facilities in fiscal year 2001. We compared VA costs to community rehabilitation hospitals using a sample from the Uniform Data System for Medical Rehabilitation of 190,112 patients discharged in 1999 from 697 facilities. LOS was a strong predictor of cost for VA and non-VA hospitals. Functional status, measured by Functional Independence Measure (FIM) scores at admission, was statistically significant but added little explanatory value after controlling for LOS. Although FIM scores were associated with LOS, FIM scores accounted for little variance in cost after controlling for LOS. These results are most applicable to researchers conducting cost-effectiveness analyses.average costs, billing, charges, cost, health economics, micro-cost methods, reimbursement, rehabilitation, VA, veterans

Analisis Pengaruh Ketebalan Nonconductive Coating Terhadap Kemampuan Pendeteksian Panjang Dan KedalamanRetak PadaFilletJoint Bracket KapalAluminium Menggunakan Pengujian Ultrasonik

Konstruksi kapal yang telah beroperasi seringkali terjadi cacat pada daerah lasnya.Cacat yang timbul seperti retak,seringterjadi tanpa disadari padasambungan las yang telah dilapisi cat sebelumnya.Retak tersebut dapat diperiksa menggunakan metode Ultrasonic testing tanpa menghilangkan cat yang terdapat pada sambungan las. Penelitian ini bertujuan untuk menganalisis pengaruh ketebalan cat tersebut terhadap pendeteksian retak dengan metode Ultrasonic testing padafillet joint di braket kapal aluminium.Scanning dilakukan pada face C dari spesimen uji. Pada setiap spesimen diberikan beberapa variasi ketebalan nonconductive coating yaitu 100 mikron, 200 mikron, 250 mikron dan 300 mikron dimana sebelum diberikan variasi ketebalan coating, spesimen terlebih dahulu diberikan retak buatan pada daerah toe las dengan variasi ukuran panjang 70 mm, 30 mm, 20 mm, dan 10 mm, dengan kedalaman 2 mm, 4 mm, 6 mm, dan 8 mm. Setelah itu tiap spesimen dilakukan pemeriksaan dengan menggunakan metode Ultrasonic testing (UT). Hasil penelitian ini menunjukkan bahwa terdapat pengaruh ketebalan nonconductive coating terhadap pendeteksian panjang dan kedalaman retak, dimana kemampuan pembacaan UT terhadap panjang retak pada spesimen dengan ketebalan nonconductive coating 100 mikron rata-rata sebesar 95,814 %, 200 mikron sebesar 89,510 %, 250 mikron sebesar 87,140 % dan 300 mikron sebesar 85,629 % dari ukuran panjang retak sebenarnya. Sedangkan kemampuan pembacaan UT terhadap kedalaman retak pada spesimen dengan ketebalan nonconductive coating 100 mikron rata-rata sebesar 99,219 %, 200 mikron sebesar 98,167 %, 250 mikron sebesar 97,396 % dan 300 mikron sebesar 96,625 % dari ukuran kedalaman crack sebenarnya. Hal ini disebabkan adanya pelemahan gelombang ultrasonik (atenuasi) pada saat gelombang ultrasonik melewati batas permukaan antara nonconductive coating dengan pelat aluminium yang mempunyai impedansi akustik berbeda maka akan terjadi pemantulan dan pembiasan gelombang ultrasonik. Sebagian energi gelombang ultrasonik juga akan hilang saat gelombang melewati interfaces material

Analisis Faktor Determinan Penggunaan Sistem Informasi Sumber Daya Manusia Dan Implikasinya Terhadap Reformasi Birokrasi Pada Bpk RI

Sistem Informasi Manajemen Sumber Daya Manusia (SISDM) pada Badan Pemeriksa Keuangan BPK RI merupakan sistem administrasi kepegawaian yang juga mendukung proses bisnis BPK RI dalam pemeriksaan dan pengelolaan tanggung jawab keuangan negara yang telah digunakan sejak tahun 2006. Meskipun sifatnya wajib (mandatory), dalam implementasinya aplikasi SISDM belum sepenuhnya digunakan oleh pegawai dan masih ditemukan kendala bagi pegawai untuk mengakses sistem. Padahal melalui sistem tersebut diharapkan dapat tercipta kehandalan data untuk memperbaiki administrasi kepegawaian. Penelitian ini dilakukan untuk mengetahui faktor-faktor determinan yang mempengaruhi pegawai BPK RI dalam menggunakan teknologi perangkat lunak SISDM dan implikasinya terhadap reformasi birokrasi pada BPK RI.Model yang digunakan dalam penelitian ini adalah model evaluasi terintegrasi. Model ini mengintegrasikan tiga teori dari sistem informasi, yaitu model DeLone dan McLean, model UTAUT, dan HOT Fit. Menurut Model evaluasi terintegrasi, penerimaan teknologi memiliki tiga dimensi: karakteristik individu, karakteristik teknologi, dan karakteristik konteks organisasi. Metode yang akan digunakan dalam penelitian ini didasarkan pada studi kuantitatif dengan teknik pengolahan data menggunakan analisis faktor konfirmatori urutan kedua di PLS.ANALISIS FAKTOR DETERMINAN PENGGUNAAN SISTEM INFORMASI SUMBER DAYA MANUSIA DAN IMPLIKASINYA TERHADAP REFORMASI BIROKRASI PADA BPK R

Memory, learning and language in autism spectrum disorder

Background and aims: The ‘dual-systems’ model of language acquisition has been used by Ullman and colleagues to explain patterns of strength and weakness in the language of higher-functioning people with autism spectrum disorder (ASD). Specifically, intact declarative/explicit learning is argued to compensate for a deficit in non-declarative/implicit procedural learning, constituting an example of the so-called ‘see-saw’ effect. Ullman and Pullman (2015) extended their argument concerning a see-saw effect on language in ASD to cover other perceived anomalies of behaviour, including impaired acquisition of social skills. The aim of this paper is to present a critique of Ullman and colleagues’ claims, and to propose an alternative model of links between memory systems and language in ASD. Main contribution: We argue that a 4-systems model of learning, in which intact semantic and procedural memory are used to compensate for weaknesses in episodic memory and perceptual learning, can better explain patterns of language ability across the autistic spectrum. We also argue that attempts to generalise the ‘impaired implicit learning/spared declarative learning’ theory to other behaviours in ASD are unsustainable. Conclusions: Clinically significant language impairments in ASD are under-researched, despite their impact on everyday functioning and quality of life. The relative paucity of research findings in this area lays it open to speculative interpretation which may be misleading. Implications: More research is need into links between memory/learning systems and language impairments across the spectrum. Improved understanding should inform therapeutic intervention, and contribute to investigation of the causes of language impairment in ASD with potential implications for prevention

Case Control Study on Dialysis Arthropathy: The Influence of Two Different Dialysis Membranes: Data from the EDTA Registry

In a retrospective case control study the prevalence of signs and symptoms of dialysis osteoarthropathy was analysed. Cases and controls had received over 9 years of maintenance haemodialysis uninterrupted by peritoneal dialysis or transplantation. The cases comprised 55 patients treated predominantly with polyacrylonitrile (AN69) dialysers. They were compared to a matched group dialysed exclusively with cellulosic membranes. Over 60% of all patients, cases and controls, showed one or more signs of disabling osteoarthropathy, with joint pains occurring more frequently in the older age groups. Twenty-seven of the 55 cases who had received less than 2 years of cellulosic membrane dialysis followed by 7-12 years of AN69 dialysis tended to have a lower prevalence of joint pains, carpal-tunnel syndrome and bone cysts. However, no statistically significant differences were obtained compared to the matched control group dialysed exclusively on cellulosic membranes (mostly cuprophane). The remaining 28 cases, who had been treated for more than 2 years with cellulosic membranes preceding the longer treatment period with polyacrylonitrile dialysers, showed a prevalence similar to that of their cellulosic controls. This study thus shows little, if any, influence of the two types of membranes on the prevalence of signs and symptoms of β2-microglobulin amyloidosi

Factors influencing anaemia in dialysis patients. A special survey by the EDTA-ERA Registry

The European Dialysis and Transplantation Association—European Renal Association (EDTA-ERA) Registry conducted a special study on anaemia in dialysis patients because it seemed important to elucidate the various factors that influence the degree of anaemia and the use of regular transfusions in dialysis patients before the introduction of recombinant human erythropoietin (rHuEpo) for larger groups of patients. In a 20% sample of all patients recorded to have been dialysed throughout 1987, statistically significant associations could be found by multifactorial analysis between haemoglobin (Hb) concentration and age, sex, primary renal disease, type of treatment, hours of dialysis per week, and number of years on renal replacement therapy. The type of dialyser membrane did not seem to play a role (although there was weak evidence of an effect of the dialyser). Mean Hb concentration for dialysis patients differed between countries as did the transfusion policy. In view of the high costs of the rHuEpo treatment and potential side-effects, factors such as method of dialysis and hours of haemodialysis per week should be taken into consideration in the treatment of anaemia in dialysis patient

Interesting magnetic properties of Fe1−x_{1-x}Cox_xSi alloys

Solid solution between nonmagnetic narrow gap semiconductor FeSi and diamagnetic semi-metal CoSi gives rise to interesting metallic alloys with long-range helical magnetic ordering, for a wide range of intermediate concentration. We report various interesting magnetic properties of these alloys, including low temperature re-entrant spin-glass like behaviour and a novel inverted magnetic hysteresis loop. Role of Dzyaloshinski-Moriya interaction in the magnetic response of these non-centrosymmetric alloys is discussed.Comment: 11 pages and 3 figure