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"Zhang, S"
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Half a lifelong romance : a novel
\"Shanghai, 1930s. Shen Shijun, a young engineer, has fallen in love with his colleague, the beautiful Gu Manzhen. He is determined to resist his family's efforts to match him with his wealthy cousin so that he can marry the woman he truly loves. But dark circumstances--a lustful brother-in-law, a treacherous sister, a family secret--force the two young lovers apart. As Manzhen and Shijun go on their separate paths, they lose track of one another, and their lives become filled with feints and schemes, missed connections and tragic misunderstandings. At every turn, societal expectations seem to thwart their prospects for happiness. Still, Manzhen and Shijun dare to hold out hope--however slim--that they might one day meet again. A glamorous, wrenching tale set against the glittering backdrop of an extraordinary city, Half a Lifelong Romance is a beloved classic from one of the essential writers of twentieth-century China.\"-- Provided by publisher.
Book
A fast radio burst source at a complex magnetized site in a barred galaxy
Fast radio bursts (FRBs) are highly dispersed, millisecond-duration radio bursts
1
–
3
. Recent observations of a Galactic FRB
4
–
8
suggest that at least some FRBs originate from magnetars, but the origin of cosmological FRBs is still not settled. Here we report the detection of 1,863 bursts in 82 h over 54 days from the repeating source FRB 20201124A (ref.
9
). These observations show irregular short-time variation of the Faraday rotation measure (RM), which scrutinizes the density-weighted line-of-sight magnetic field strength, of individual bursts during the first 36 days, followed by a constant RM. We detected circular polarization in more than half of the burst sample, including one burst reaching a high fractional circular polarization of 75%. Oscillations in fractional linear and circular polarizations, as well as polarization angle as a function of wavelength, were detected. All of these features provide evidence for a complicated, dynamically evolving, magnetized immediate environment within about an astronomical unit (
au
; Earth–Sun distance) of the source. Our optical observations of its Milky-Way-sized, metal-rich host galaxy
10
–
12
show a barred spiral, with the FRB source residing in a low-stellar-density interarm region at an intermediate galactocentric distance. This environment is inconsistent with a young magnetar engine formed during an extreme explosion of a massive star that resulted in a long gamma-ray burst or superluminous supernova.
Analysis of a set of 1,863 bursts from the repeating source FRB 20201124A provides evidence of a complicated magnetized site within about an astronomical unit from the source in a barred galaxy.
Journal Article
HXMT identification of a non-thermal X-ray burst from SGR J1935+2154 and with FRB 200428
Fast radio bursts (FRBs) are short pulses observed in the radio band from cosmological distances
1
. One class of models invokes soft gamma-ray repeaters (SGRs), or magnetars, as the sources of FRBs
2
. Some radio pulses have been observed from some magnetars
3
, but no FRB-like events have been detected in association with any magnetar burst, including one giant flare
4
. Recently, a pair of FRB-like bursts (termed FRB 200428) separated by 29 milliseconds were detected from the general direction of the Galactic magnetar SGR J1935+2154 (refs.
5
,
6
). Here, we report the detection of a non-thermal X-ray burst in the 1–250 keV energy band with the Insight-HXMT satellite
7
, which we identify as having been emitted from SGR J1935+2154. The burst showed two hard peaks with a separation of 34 milliseconds, broadly consistent with that of the two bursts in FRB 200428. The delay time between the double radio peak and the X-ray peaks is about 8.62 s, fully consistent with the dispersion delay of FRB 200428. We thus identify the non-thermal X-ray burst to be associated with FRB 200428, whose high-energy counterpart is the two hard X-ray peaks. Our results suggest that the non-thermal X-ray burst and FRB 200428 share the same physical origin in an explosive event from SGR J1935+2154.
Insight-HXMT detected a double-peaked X-ray burst from Galactic magnetar SGR J1935+2154, consistent with two fast radio bursts (FRBs) observed from the same object within seconds. This coincidence suggests a common physical origin, and gives insight into the mechanism behind the origin of FRBs.
Journal Article
The Oxford companion to the economics of China
This work provides a wide range of perspectives on the past, present, and future of the Chinese economy. The topics covered include: the China model, future prospects for China; China and the global economy; trade and the Chinese economy; macro-economics and finance; urbanization; industry and markets; agriculture and rural development; land, infrastructure and environment; population and Labour; dimensions of well-being and inequality; health, education, and gender equity; regional divergence in China; and a brief look at a selection of China's provinces.
Book
Tunable anomalous Hall conductivity through volume-wise magnetic competition in a topological kagome magnet
Magnetic topological phases of quantum matter are an emerging frontier in physics and material science. Along these lines, several kagome magnets have appeared as the most promising platforms. Here, we explore magnetic correlations in the kagome magnet Co
3
Sn
2
S
2
. Using muon spin-rotation, we present evidence for competing magnetic orders in the kagome lattice of this compound. Our results show that while the sample exhibits an out-of-plane ferromagnetic ground state, an in-plane antiferromagnetic state appears at temperatures above 90 K, eventually attaining a volume fraction of 80% around 170 K, before reaching a non-magnetic state. Strikingly, the reduction of the anomalous Hall conductivity (AHC) above 90 K linearly follows the disappearance of the volume fraction of the ferromagnetic state. We further show that the competition of these magnetic phases is tunable through applying either an external magnetic field or hydrostatic pressure. Our results taken together suggest the thermal and quantum tuning of Berry curvature induced AHC via external tuning of magnetic order.
The kagome magnet Co
3
Sn
2
S
2
has complex magnetic behaviour and a topological band structure that yields a large anomalous Hall effect. Guguchia et al. find phase separation between ferro- and anti-ferromagnetic orders and that the volume-wise competition controls the anomalous Hall conductivity
Journal Article
A view from the stars
A View from the Stars is a collection of short fiction and nonfiction pieces from Cixin Liu, the New York Times bestselling author of The Three-Body Problem. Included are essays and interviews that shed light on Liu's experiences as a reader, writer, and lover of science fiction throughout his life, as well as short fiction that gives glimpses into the evolution of his imaginative voice over the years\"--Back cover.
BOOK
Enhanced energy coupling for indirect-drive fast-ignition fusion targets
One of the most promising approaches to reach a high gain in inertial confinement fusion is the fast ignition scheme. In this scheme, a relativistic electron beam is generated; this passes through the imploded plasma and deposits parts of its energy in the core. However, the large angular spread of the relativistic electron beam and the poorly controlled compression of the target affect realization of the fast ignition technique. Here, we demonstrate that indirectly driven (that is, driven by X-rays generated inside a gold hohlraum) implosions with a ‘high-foot’ and a short-coast time of less than 200 ps allow us to tightly compress the shell. Furthermore, we show the ability to optimize the symmetry of the imploding shell by changing the hohlraum length, successfully tuning a suitable tube-shaped shell to compensate for the large angular spread of the relativistic electron beam and to enhance the electron-to-core coupling efficiency via resistive magnetic fields. Benefiting from those experimental techniques, a significant enhancement in neutron yield was achieved in our indirectly driven fast ignition experiments. These results pave the way towards high-coupling fast ignition experiments with indirectly driven targets similar to those at the National Ignition Facility.
Experiments realizing the indirect-drive fast ignition scheme for inertial confinement fusion are reported. Enabled by a tightly compressed target, an increase of neutron yield is observed.
Journal Article
تعرف إلى عادات الشعب الصيني
يبين هذا الكتاب الاختلافات الثقافية بين الصينيين والغربيين، لكنه يذكرنا أيضاً بوجود الكثير من أوجه الشبه. فنحن نملك جميعاً أحلاماً وطموحات ورغبات، ونحتاج جميعاً إلى أن نحظى بالحب والاحترام. ونريد جميعاً السلام والاستقرار، وكذلك حياة أفضل لأنفسنا ولعائلاتنا، كل شعار ألعاب بيجيغ الأولمبية لسنة 2008 هو عالم واحد، حلم واحد وهذا يشير إلى أن الأشخاص من ثقافات مختلفة يملكون العديد من الأهداف نفسها، وإنما يستخدمون طرقاً مختلفة لبلوغها.
Book
Confidence intervals for low dimensional parameters in high dimensional linear models
The purpose of this paper is to propose methodologies for statistical inference of low dimensional parameters with high dimensional data. We focus on constructing confidence intervals for individual coefficients and linear combinations of several of them in a linear regression model, although our ideas are applicable in a much broader context. The theoretical results that are presented provide sufficient conditions for the asymptotic normality of the proposed estimators along with a consistent estimator for their finite dimensional covariance matrices. These sufficient conditions allow the number of variables to exceed the sample size and the presence of many small non‐zero coefficients. Our methods and theory apply to interval estimation of a preconceived regression coefficient or contrast as well as simultaneous interval estimation of many regression coefficients. Moreover, the method proposed turns the regression data into an approximate Gaussian sequence of point estimators of individual regression coefficients, which can be used to select variables after proper thresholding. The simulation results that are presented demonstrate the accuracy of the coverage probability of the confidence intervals proposed as well as other desirable properties, strongly supporting the theoretical results.
Journal Article