bluuebunny/crossref_metadata_2025_split huggingface dataset:
Rebuilding Home Around Hardened Borders
Authors: Li Melody Yunzi 
Published: January 2021

Anti-Chinese sentiment and sinophobia have arisen as one of the current corona virus’s most serious side effects. These conditions have challenged the Chinese diasporic community’s sense of home. Far from mere diversion in a time of turmoil, Chinese literature has the power to disrupt state narratives and contest polarising claims from politicians. Online literature during the pandemic has not been limited to the Chinese diaspora, and its themes have not been limited to hate crimes. Online literature in the diaspora and in China debunks grand narratives set by the state, and provides a sense of nonphysical homecoming for them. Like these Chinese diasporic writers, we too can find our belonging with each other virtually.
UPAYA MEMBANGUN MINAT MEMBACA MELALUI PROGRAM BERAKSI (BERUGAK LITERASI) DI SMP ISLAM MUSTHOFA KAMAL
Authors: Albani Aldi 
Published: January 2021

Rendahnya minat baca masyarakat Indonesia tampaknya ditanggapi serius oleh pemerintah dengan mengadakan program Gerakan Literasi Nasional. Hal ini tampaknya dimulai dari lembaga pendidikan baik di tingkat dasar, menenengah dan tinggi. Masalah utama dalam meningkatakan minat baca peserta didik khususnya di sekolah tentu bervariasi, adakalanya keterbatasan buku bacaan, tidak ada prasarana yang menunjang kegiatan membaca atau bahkan tidak ada guru yang bisa diteladani dan dapat menginspirasi peserta didik dalam membaca. Berbagai masalah itu coba diselesaikan dengan gerakan literasi di sekolah-sekolah. Begitu juga yang telah kami upayakan di SMP Islam Musthofa Kamal dengan mengadakan program BERAKSI yang bertujuan untuk merangsang kemauan siswa untuk terbiasa membaca dengan menfasilitasi mereka dengan prasarana khusus untuk membaca di sekolah. Metode yang penelitain dalam kajian ini adalah kualitatif deskriptif yang menggambarkan apa adanya dari pelaksanakan sebuah program. Teknik pengumpulan data yang digunakan adalah observasi dan dokumentasi. Analisis dilakukan sejak awal pelaksanaan pengamatan dengan menggunakan teknik Miles and Huberman. Adapun langkah-langkah dalam mewujudkan program tersebut di antaranya; perencanaan, pelaksanaan, evaluasi dan monitoring serta tindak lanjut. Adapun kesimpulan hasil program BERAKSI di SMP Islam Musthofa Kamal antara lain: 1) kemauan peserta didik untuk membaca mulai tumbuh; 2) berugak literasi selalu ramai dikunjungi oleh peserta didik pada jam-jam istirahat; 3) guru dapat memanfaatkan berugak literasi sebagai outdoor class; 4) guru dan staf menyempatkan diri untuk ikut membaca karena melihat peserta didik mulai ramai membaca; 5) perasaan senang dan gembira terpancar dari raut wajah peserta didik yang tengah membaca sambil sekali waktu bercerita dan bercengkrama dengan temannya di berugak literasi. Program BERAKSI merupakan salah satu upaya yang cukup efektif untuk menumbuhkan minat baca peserta didik di lingkungan sekolah.
IMPLEMENTASI PRINSIP-PRINSIP MANAJEMEN PENDIDIKAN ISLAM DALAM HOMESCHOOLING DI TENGAH PANDEMI COVID-19
Authors: Ismiani Sri 
Published: January 2021

Dilema para pendidik dan peserta didik saat munculnya pandemi COVID-19, antara sekolah atau diliburkan sampai waktu yang tidak bisa ditentukan. Kementrian Pendidikan dan Kebudayaan menetapkan peraturan untuk melakukan proses belajar mengajar secara daring agar proses pembelajaran tetap berlangsung. Proses belajar secara daring tak selamanya bisa menjadi solusi terbaik di masa pandemi, karena banyak siswa yang memiliki keterbatasan jaringan internet untuk melakukan proses belajar. Homeschooling merupakan salah satu alternatif agar siswa tetap bisa belajar di tengah pandemi. Homeschooling tunggal merupakan salah satu pendidikan non formal yang dilaksanakan oleh orang tua dalam satu keluarga tanpa bergabung dengan lainnya dengan mendatangkan guru ke rumah disaat masa pandemi ini. Dalam keberlanjutan homeschooling dibutuhkan manajemen pendidika yang tepat agar proses pembelajaran berjalan dengan baik. Manajemen pendidikan merupakan implementasi prinsip-prinsip manajemen dalam ranah pendidikan. Artikel ini bertujuan untuk membahas implementasi prinsip-prinsip manajemen pendidikan islam dalam homeschooling di tengah pnsemi COVID-19.
ANALISIS PENGARUH PELAYANAN KELUHAN TERHADAP TINGKAT KEPUASAN SISWA PADA SMA 1 PRINGGABAYA LOTIM NTB.
Authors: Shanti Sri 
Published: January 2021

Kepuasan pelanggan (siswa) adalah fungsi dari perbedaan antara kinerja yang dirasakan dengan harapan pelanggan (siswa). Permasalahan yang diteliti dalam penelitian ini adalah bagaimana hubungan pengaruh variabel Bukti Langsung, Keandalan, Daya Tanggap, Empati dan jaminan secara simultan terhadap Tingkat Kepuasan Pelanggan dari variabel Pelayanan Keluhan mana yang berpengaruh dominan terhadap Tingkat Kepuasan Pelanggan.
Jenis penelitian yang digunakaan adalah eksplanatori yaitu menguji hipotesis bahwa terdapat hubungan dan pengaruh dari variabel Pelayanan Keluhan, yaitu: Bukti Langsung, Keandalan, Daya Tanggap, Empati dan Jaminan secara bersamaan terhadap Tingkat Kepuasan siswa dan terdapat salah satu variabel Pelayanan Keluhan yang berpengaruh dominan terhadap Tingkat Kepuasan siswa. Penelitian ini dilaksanakan pada SMA 1 Pringgabaya Lotim NTB dengan mengambil sampel sebanyak 128 orang dari populasi siswa yang melakukan keluhan selama tahun 2020.Teknik Pengumpulan sampel adalah Purposive Samplig.
Dalam analisis dan secara statasistik, digunakan metode analisis korelasi linier berganda dan koefisien regresi berganda pada tinkgat signifikasnsi 0,05 yang diolah komputer dengan menggunakan program SPSS versi 25. Dari hasil analisis dengan metode tersebut dapat dibuktikan bahwa variabel pelayanan keluahan pelanggan (siswa) yaitu: Bukti Langsung, Keandalan, Daya Tanggap, Empati dan Jaminan mempunyai hubungan dan pengaruh yang signifikan secara bersama-sama terhadap tingkat kepuasan pelanggan dengan korelasi berganda (R) sebesar 0,919 yang artinya tingkat keeratan hubungan yang sangat tinggi. Untuk menguji secara bersama-sama antara variabel-variabel bebas dan varibel terikat, diketahui bahwa variabel jaminan merupakan variabel yang paling dominan dengan tingkat t hitung 2,82.
Jaminan menjadi variabel bebas mempunyai pengaruh yang paling dominan terhadap tingkat kepuasan pelanggan, jaminan pelayanan yang terdiri dari: kepampuan, kepastian dan hasil penaganan keluhan memuaskan pelanggan (siswa) adalah tujuan utama dari penyampaian keluhan pelanggan (siswa). Setiap pelanggan (siswa) menyampaikan keluhan tentu ingin sekali keluhan dapat terselesaikan dengan cepat, akurat dan memuaskan. Jaminan dari suatu pelayanan mempunyai pengaruh terhadapa tingkat konsistensi kerja (performance) dari SMA 1 Pringgabaya Lotim NTB, terlebih lagi jaminan menujukkan kemampuan SMA 1 Pringgabaya Lotim NTB untuk dapat dipercaya pelanggan (siswa).
IMPLEMENTASI SISTEM PENJAMINAN MUTU INTERNAL DALAM MENINGKATKAN MUTU LAYANAN PENDIDIKAN
Authors: Sulastri Tien 
Published: January 2021

Penelitian ini dilatar belakangi dengan adanya mutu pendidikan yang rendah di berbagai pendidikan, sehingga perlu diadakan Sistem Penjaminan Mutu Internal Mutu Layanan Pendidikan dapat meningkat. Tujuan penelitian ini untuk mengetahui standar, pemetaan mutu, peencanaan, pelaksanaan, evaluasi, strategi faktor penghambat dan pendukung penjaminan mutu di SD Darul Hikam 2 dan SDN 200 Lewipanjang Kota Bandung.Penelitian ini menggunakan pendekatan kualitatif dengan metode deskriptif.Teknik pengumpulan data mengunakan observasi peran serta, wawancara mendalam, dan dokumentasi. Data dianalisis melalui reduksi data, penyajian data, penarikan kesimpulan, dan uji keabsahan datanya dengan triangulasi. Hasil temuan penelitian ini bahwa kedua sekolah ini secara keseluruhan sudah mengimplementasikan sistem penjaminan mutu internal dalam meningkatkan mutu layanan pendidikan di sekolahnya masing-masih dengan hasil baik karena paling rendah berada pada rentang 5,06 dan itu artinya termasuk kategori menuju SNP 3 dengan perolehan bintang 3.
PENGARUH MANAJEMEN PEMBIAYAAN PENDIDIKAN DAN FASILITAS PEMBELAJARAN TERHADAP MUTU SEKOLAH
Authors: Ida Nurlaya Lilis 
Published: January 2021

Mutu sekolah berkaitan langsung dengan bagaimana kualitas pendidikan pada sebuah satuan pendidikan. Dalam pencapaian mutu sekolah yang baik perlu diperhatikan mutu guru, mutu siswa, kultur dan disiplin sekolah, serta fasilitas dan pembiayaan pendidikan. Penelitian ini memfokuskan pada kajian bagaimana pengaruh manajemen pembiayaan pendidikan dan fasilitas pembelajaran terhadap mutu sekolah. Tujuannya untuk mengetahui gambaran dan menganalisis pengaruh manajemen pembiayaan pendidikan dan fasilitas pembelajaran terhadap mutu sekolah. Penelitian ini menggunakan metode deskriptif dengan pendekatan kuantitatif. Pengambilan sampel terhadap 10 kepala sekolah SMK Swasta se-KORWIL III Kabuaten Bandung. Teknik analisis menggunakan analisis deskriptif dan analisis inferensial. Hasil penelitian ini menunjukan bahwa pengaruh manajemen pembiayaan pendidikan dan fasilitas pembelajaran terhadap mutu sekolah secara bersama-sama memberikan pengaruh yang kuat dan signifikan. sebesar 38.5%, artinya manajemen pembiayaan pendidikan dan fasilitas pembelajaran berhubungan secara simultan dan signifikan dengan mutu sekolah. Sedangkan sisanya sebesar 61.5% ditentukan oleh faktor-faktor lainnya yang tidak dijelaskan dalam penelitian ini.
General Practice Registrars’ Management of and Specialist Referral Patterns for Atopic Dermatitis
Authors: Willems Anneliese , Tapley Amanda , Fielding Alison , Tng Vivian , Holliday Elizabeth , Van Driel Mieke , Ball Jean , Davey Andrew , FitzGerald Kristen , Spike Neil A. , Magin Parker J. 
Published: January 2021

Background: Atopic dermatitis (AD) is a common presentation in the general practice (GP) setting. Implementation of appropriate referral pathways is instrumental for best patient care and is an essential skill for Australian GP registrars.
Objectives: We aimed to explore the prevalence and associations of GP registrar referrals to specialists for AD management.
Methods: A cross-sectional analysis utilizing data from the Registrar Clinical Encounters in Training (ReCEnT) project, an ongoing cohort study that documents in-consultation clinical and educational experience of Australian GP registrars. Registrar, patient, and consultation factors associated with referrals for AD were established using logistic regression.
Results: A A total of 3,285 (0.55%) of 595,412 diagnoses managed were AD, of which 222 (6.8%) resulted in referral. Of these referrals, 70% were to dermatologists, 17% to allergists/immunologists, and 10% to pediatricians. Associations of referral included registrar female gender, patient age, longer consultation duration; an established (rather than new) AD diagnosis; supervisor advice being sought; and learning goals being generated.
Conclusions: Both registrar and patient factors influence AD referral patterns. Registrars referred established rather than newly diagnosed AD, suggesting a level of comfort in initial management. Referral was associated with longer consultations, seeking supervisor advice, and generation of learning goals—suggesting these are more complex presentations and, possibly, registrar learning opportunities. A significant proportion of referrals were to non-dermatologist specialists. The implication of this for optimal patient care is a subject for further study.
Alternative‐Ultrathin Assembling of Exfoliated Manganese Dioxide and Nitrogen‐Doped Carbon Layers for High‐Mass‐Loading Supercapacitors with Outstanding Capacitance and Impressive Rate Capability
Authors: Jeong Jae‐Min , Park Seung Hwa , Park Hong Jun , Jin Se Bin , Son Seon Gyu , Moon Jong‐Min , Suh Hoyoung , Choi Bong Gill 
Published: January 2021

AbstractManganese dioxide (MnO2) materials have received much attention as promising pseudocapacitive materials owing to their high theoretical capacitance and natural abundance. Unfortunately, the charge storage performance of MnO2 is usually limited to commercially available mass loading electrodes because of the significantly lower electron and ion migration kinetics in thick electrodes. Here, an alternatively assembled 2D layered material consisting of exfoliated MnO2 nanosheets and nitrogen‐doped carbon layers for ultrahigh‐mass‐loading supercapacitors without sacrificing energy storage performance is reported. Layered birnessite‐type MnO2 is efficiently exfoliated and intercalated by a carbon precursor of dopamine using a fluid dynamic‐induced process, resulting in MnO2/nitrogen‐doped carbon (MnO2/C) materials after self‐polymerization and carbonization. The alternatively stacked and interlayer‐expanded structure of MnO2/C enables fast and efficient electron and ion transfer in a thick electrode. The resulting MnO2/C electrode shows outstanding electrochemical performance at an ultrahigh mass loading of 19.7 mg cm−2, high gravimetric and areal capacitances of 480.3 F g−1 and 9.4 F cm−2 at 0.5 mA cm−2, and rapid charge/discharge capability of 70% capacitance retention at 40 mA cm−2. Furthermore, asymmetric supercapacitor based on high‐mass‐loading MnO2/C can deliver an extremely high energy of 64.2 Wh kg−1 at a power density of 18.8 W kg−1 in an aqueous electrolyte.
Terahertz Spin‐to‐Charge Conversion by Interfacial Skew Scattering in Metallic Bilayers
Authors: Gueckstock Oliver , Nádvorník Lukáš , Gradhand Martin , Seifert Tom Sebastian , Bierhance Genaro , Rouzegar Reza , Wolf Martin , Vafaee Mehran , Cramer Joel , Syskaki Maria Andromachi , Woltersdorf Georg , Mertig Ingrid , Jakob Gerhard , Kläui Mathias , Kampfrath Tobias 
Published: January 2021

AbstractThe efficient conversion of spin to charge transport and vice versa is of major relevance for the detection and generation of spin currents in spin‐based electronics. Interfaces of heterostructures are known to have a marked impact on this process. Here, terahertz (THz) emission spectroscopy is used to study ultrafast spin‐to‐charge‐current conversion (S2C) in about 50 prototypical F|N bilayers consisting of a ferromagnetic layer F (e.g., Ni81Fe19, Co, or Fe) and a nonmagnetic layer N with strong (Pt) or weak (Cu and Al) spin‐orbit coupling. Varying the structure of the F/N interface leads to a drastic change in the amplitude and even inversion of the polarity of the THz charge current. Remarkably, when N is a material with small spin Hall angle, a dominant interface contribution to the ultrafast charge current is found. Its magnitude amounts to as much as about 20% of that found in the F|Pt reference sample. Symmetry arguments and first‐principles calculations strongly suggest that the interfacial S2C arises from skew scattering of spin‐polarized electrons at interface imperfections. The results highlight the potential of skew scattering for interfacial S2C and propose a promising route to enhanced S2C by tailored interfaces at all frequencies from DC to terahertz.
A Flexible Electromagnetic Interference Shielding Fabric Prepared by Construction of PANI/MXene Conductive Network via Layer‐by‐Layer Assembly
Authors: Yin Guang , Wang Yu , Wang Wei , Qu Zhongji , Yu Dan 
Published: January 2021

AbstractThe electromagnetic interference (EMI) shielding textiles accomplishing high‐level EMI protective performance and wear comfort has been designed and developed. 1D polyaniline nanowires and 2D transition metal carbide/carbonitride nanosheets are loaded on the carbon fiber fabric via a layer‐by‐layer (L‐b‐L) assembly approach to fabricate a functional layer and followed with a polydimethylsiloxane (PDMS) coating. The resultant fabric exhibits a high electrical conductivity of ≈325 S m−1 and the EMI shielding effectiveness ≈35.3 dB with only 0.376 mm thickness. Benefiting from the hydrophobic effect of thin PDMS film, a satisfactory self‐cleaning performance with a large contact angle of 135.2° is achieved. Furthermore, favorable flexibility, air permeability (346 mm s−1), and thermal management further broaden the field of practical application. This work can provide a new solution for next‐generation EMI shielding materials in view of the comprehensive performance.
Synthesis of Fluorescent 4‐Azapyrenes by Palladium(II)‐Catalyzed Dual C−H Bond Activation and Annulation
Authors: Hsiao Huan‐Chang , Annamalai Pratheepkumar , Jayakumar Jayachandran , Sun Shang‐You , Chuang Shih‐Ching 
Published: January 2021

AbstractUnique dual‐emissive and deep‐blue/green fluorescent multi‐substituted 4‐azapyrenes with bathochromic shift emission, quantum yields up to 0.60 and long excited‐state lifetime were synthesized successfully by annulative π‐extension reactions. This synthesis constitutes a palladium‐catalyzed dehydrogenative annulation of N‐acyl‐2‐aminobiaryls with in situ 1,3‐diynes as a key step, giving substituted phenanthrenes via a rollover C−H bond activation, followed by Bischler‐Napieralski cyclization. Further π‐extension by superacid‐mediated cyclization produced a blue fluorescent naphtho 4‐azapyrene.magnified image
Correlation between Symmetry and Phase Transition Temperature of VO2 Films Deposited on Al2O3 Substrates with Various Orientations
Authors: Choi Yesul , Lee Dooyong , Song Sehwan , Kim Jiwoong , Ju Tae‐Seong , Kim Hyegyeong , Kim Jayeong , Yoon Seokhyun , Kim Yunseok , Phan Thang Bach , Bae Jong‐Seong , Park Sungkyun 
Published: January 2021

AbstractThe structural aspects of the insulator–metal transition (IMT) characteristics of VO2 are sensitive to the octahedral symmetry variation of VO6. By varying substrate orientation (c‐, a‐, and m‐plane Al2O3), the correlation between IMT temperature and local symmetry is investigated. For a VO2 film deposited on m‐plane Al2O3, which has high symmetry due to fewer domain boundaries induced by m‐plane Al2O3, the IMT temperature is low (326.47 K). In contrast, for a film deposited on c‐plane Al2O3 (having lower symmetry), the IMT temperature is the highest (336.74 K) among the films used in this work. Furthermore, temperature‐dependent Raman spectra reveals that the structural phase transition temperature decreases in the order of the VO2 film deposited on c‐, a‐, and m‐plane Al2O3, suggesting that the symmetrical structure reduces the activation energy for IMT by decreasing thermodynamic energy. These results demonstrate that structural symmetry plays a crucial role in lowering the transition temperature.
Effects of Size Reduction on the Electrical Transport Properties of 3D Bi Nanowire Networks
Authors: Wagner Michael Florian Peter , Paulus Anna Sarina , Brötz Joachim , Sigle Wilfried , Trautmann Christina , Voss Kay‐Obbe , Völklein Friedemann , Toimil‐Molares Maria Eugenia 
Published: January 2021

Abstract3D nanowire networks are fascinating systems for future microelectronic devices. They can be handled like macroscopic objects, while exhibiting properties of nanoscale materials. Here, the fabrication of free‐standing 3D bismuth nanowire networks with well‐controlled and systematically adjusted wire diameter and interconnectivity is presented. The samples are fabricated by pulse electroplating of bismuth into the pores of ion track‐etched membranes using an aqueous electrolyte. By optimizing the growth parameters, homogeneously grown, mechanically self‐supporting and free‐standing networks without a supporting matrix are achieved. Cross‐plane Seebeck coefficient and electrical resistance values are investigated as a function of nanowire diameter and temperature. The unique characteristics of these highly interconnected and mechanically self‐supported Bi 3D nanowire networks offer exciting perspectives for their implementation in, e.g., infrared detection based on thermoelectric effects, sensing, and THz applications.
Achieving High Thermoelectric Performance and Metallic Transport in Solvent‐Sheared PEDOT:PSS
Authors: Hinckley Allison C. , Andrews Sean C. , Dunham Marc T. , Sood Aditya , Barako Michael T. , Schneider Sebastian , Toney Michael F. , Goodson Kenneth E. , Bao Zhenan 
Published: January 2021

AbstractPolymer‐based materials hold great potential for use in thermoelectric applications but are limited by their poor electrical properties. Through a combination of solution‐shearing deposition and directionally applied solvent treatments, poly(3,4‐ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) thin films with metallic‐like conductivities can be obtained with high power factors in excess of 800 µW m−1 K−2. X‐ray scattering and absorption data indicate that structural alignment of PEDOT chains and larger‐sized domains are responsible for the enhanced electrical conductivity. It is expected that further enhancements to the power factor can be obtained through device geometry and postdeposition solvent shearing optimization.
Die nächste Generation synthetischer Muschelkleberpolymere durch muschelinspirierte Polymerisation
Authors: Krüger Jana M. , Börner Hans G. 
Published: January 2021

AbstractDie muschelinspirierte Polymerisation (MIPoly) stellt, inspiriert durch die Bildung von Cysteinyldopa als biogene Verknüpfungseinheit, eine Möglichkeit dar, um synthetisch adhäsive Polymere herzustellen. Hierbei wird die große Familie der chemisch vielfältigen Bisphenolmonomere eingesetzt, die durch 2‐Iodoxybenzoesäure zu Dichinonen aktiviert werden kann. Diese Dichinone reagieren in Michael‐artigen Polyadditionen mit Dithiolen, wobei Polymere mit adhäsiven Thiol‐Catechol‐Verknüpfungen (thiol–catechol connectivities, TCC) gebildet werden. Eine Reihe verschiedener TCC‐Polymere zeigte adhäsive Eigenschaften auf Aluminium und Polypropylen, wobei diese auf dem anspruchsvollen Polypropylen konkurrenzfähige Haftfestigkeiten zu handelsüblichen Epoxidharzen aufwiesen. Die MIPoly verspricht eine einfache Skalierbarkeit und hohe Modularität, wodurch maßgeschneiderte Klebstoffe hergestellt werden könnten. Dies wurde anhand einer kleinen Stoffbibliothek nachgewiesen, aus der ein Kandidat bereits eine Unterwasserklebung von Aluminium erlaubte.
On‐Surface Synthesis of Nitrogen‐Doped Kagome Graphene
Authors: Pawlak Rémy , Liu Xunshan , Ninova Silviya , D'Astolfo Philipp , Drechsel Carl , Liu Jung‐Ching , Häner Robert , Decurtins Silvio , Aschauer Ulrich , Liu Shi‐Xia , Meyer Ernst 
Published: January 2021

AbstractNitrogen‐doped Kagome graphene (N‐KG) has been theoretically predicted as a candidate for the emergence of a topological band gap as well as unconventional superconductivity. However, its physical realization still remains very elusive. Here, we report on a substrate‐assisted reaction on Ag(111) for the synthesis of two‐dimensional graphene sheets possessing a long‐range honeycomb Kagome lattice. Low‐temperature scanning tunneling microscopy (STM) and atomic force microscopy (AFM) with a CO‐terminated tip supported by density functional theory (DFT) are employed to scrutinize the structural and electronic properties of the N‐KG down to the atomic scale. We demonstrate its semiconducting character due to the nitrogen doping as well as the emergence of Kagome flat bands near the Fermi level which would open new routes towards the design of graphene‐based topological materials.
Asymmetric Hydroacylation Involving Alkene Isomerization for the Construction of C3‐Chirogenic Center
Authors: Liu Chong , Yuan Jing , Zhang Zhenfeng , Gridnev Ilya D. , Zhang Wanbin 
Published: January 2021

AbstractA new transformation pattern for enantioselective intramolecular hydroacylation has been developed involving an alkene isomerization strategy. Proceeding through a five‐membered rhodacycle intermediate, 3‐enals were converted to C3‐ or C3,C5‐chirogenic cyclopentanones with satisfactory yields, diastereoselectivities, and enantioselectivities. A catalytic cycle has been theoretically calculated and the origin of the stereoselection is rationally explained.