Archives, Room Use Only - QC665.P7715 1909

Archives, Room Use Only - TK151.B43 1901

Archives, Room Use Only - QC670.C43 1855

Archives, Room Use Only - TK5261.S34 1882

Archives, Room Use Only - TK5275.S39 1874

The Inorganic Crystal Structure Database (ICSD) is the world's largest database of fully evaluated and published crystal structure data, mostly obtained from experimental results. However, the purely experimental approach is no longer the only route to discover new compounds and structures. In the past few decades, numerous computational methods for simulating and predicting structures of inorganic solids have emerged, creating large numbers of theoretical crystal data. In order to take account of these new developments the scope of the ICSD was extended in 2017 to include theoretical structures which are published in peer-reviewed journals. Each theoretical structure has been carefully evaluated, and the resulting CIF has been extended and standardized. Furthermore, a first classification of theoretical data in the ICSD is presented, including additional categories used for comparison of experimental and theoretical information.

How did the universe begin? And what came before the Big Bang? Cosmologists have asked these questions ever since discovering that our universe is expanding. […]

The post Theorists Propose a New Method to Probe the Beginning of the Universe appeared first on Smithsonian Insider.

Seven corrections are made and several supplementary equations are added to the article by Yoshimura [Acta Cryst. (2015), A71, 368–381].

The discovery of starch granules in the calculus on Neandertal teeth provides direct evidence that they made sophisticated, thoughtful food choices and ate more nutrient-rich plants, for example date palms, legumes and grains such as barley.

The post Starch grains found on Neandertal teeth debunks theory that dietary deficiencies caused their extinction appeared first on Smithsonian Insider.

A Landau theory for the wurtzite-based heterovalent ternary semiconductor ZnSnN2 is developed and a first-order reconstructive phase transition is proposed as the cause of observed crystal structure disorder. The model infers that the phase transition is paraelectric to antiferroelectric.

'Game theory' is a mathematical framework that aims to predict the performance of individuals or groups by considering the interaction between them. New research has applied game theory to three different cases of biodiversity conservation to predict conflict and offer broad suggestions for overcoming disagreements.

Do you believe that "everything happens for a reason"? You might be making this error, too.

A new, highly speculative conjecture about the extinction of ancient humans is sure to raise critics' brows.

New film, based on the best-selling book by Dan Brown, warns of humanity's demise from unchecked population growth.

'Golden Boy' star Theo James hates waste.

Sabrina Gonzalez Pasterski, who built and flew her own plane at 14, just earned a Ph.D. from Harvard and she's proof of the growing power of the STEM push.

Theodore Wirth Park in Minnesota goes beyond the usual amenities with a 15-acre garden and bird sanctuary, mountain biking trails and even a snow-tubing trail w

You won’t find a home where the buffalo roam across this section of the Great Plains, but you will find 126 campsites at Theodore Roosevelt National Park. You

"Deeds of Satan the Devil that Oppose God Must Disappear from the Earth"

Incheon Metropolitan City and Incheon Technopark (Incheon TP) held the "MUST GO IN KOREA Beauty 365" event at the Bio Industry Center on the 1st floor of Michuhol Tower, Songdo International City.

Dr. Malinin has been endorsed by Marquis Who's Who as a leader in the fields of orthopedics and surgery

Mr. McCutcheon celebrates more than 20 years of professional excellence

Provide full support such as operation, personnel salary, material purchase, traffic accident, accounting and education for bus company work

Elite Spine Houston's head Chiropractor Dr. Billy Cheong DC has been awarded "Houston's Top Doctor of 2019" making it his second time receiving this award. Dr. Cheong is the only Chiropractor included in the list this year.

SAVVI Financial LLC co-founder, Dr. Dimitris Bertsimas, is awarded the INFORMS President's Award and the Prestigious John von Neumann Theory Prize.

Mr. Stockmon thrives as a school resource officer with the North Haven Police Department

H.H. Dorje Chang Buddha III was Compelled and Could Not Decline

Former L'Oreal Executive and Product Innovation Guru, Sam Cheow, will lead the 2019 Global Cannabinoids Product Development Team as they release a wide array of innovative new products for the Hemp CBD skin care, hair, and cosmetic industry

Theodora Uniken Venema Offers the American Dream to All

Unite & Rise celebrates the 100th anniversary of the 19th Amendment

Adam Waytz and Malia Mason, authors of the HBR article "Your Brain at Work."

Clayton Christensen, professor at Harvard Business School, builds upon the theory of disruptive innovation for which he is well-known. He speaks about his new book examining how successful companies know how to grow.

Safi Bahcall, a former biotech CEO, began his career as a theoretical physicist before joining the business world. He compares the moment that innovative companies become complacent ones to a glass of water freezing, becoming ice. The elements are the same, but the structure of the company has changed. Bahcall offers ways for growing companies to avoid these inevitable forces and continue to innovate. He's the author of the book "Loonshots: How to Nurture the Crazy Ideas That Win Wars, Cure Diseases, and Transform Industries" and the HBR article “The Innovation Equation."

The Department of Justice announced today that it is requiring United Technologies Corporation (UTC) and Raytheon Company (Raytheon) to divest Raytheon’s military airborne radios business and UTC’s military global positioning systems (“GPS”) and large space-based optical systems businesses in order to proceed with their proposed merger.  Without these divestitures, the merger would eliminate competition between two of the primary suppliers of military airborne radios and military GPS systems to the Department of Defense (DoD), and enable the merged firm to lessen competition for multiple components used in reconnaissance satellites sold to DoD and the wider U.S. intelligence community.  

On Saturday, March 28, 2009, Grand Canyon National Park will host Archeology Day in honor of "Arizona Archaeology and Heritage Awareness Month".  https://www.nps.gov/grca/learn/news/2009-03-17_arch_day.htm

On Saturday, March 27, 2010, Grand Canyon National Park will host Archeology Day in honor of "Arizona Archaeology and Heritage Awareness Month." https://www.nps.gov/grca/learn/news/2010-03-02_arch_day.htm

On Saturday, March 19, 2011, Grand Canyon National Park will host Archeology Day in honor of “Arizona Archaeology and Heritage Awareness Month.” https://www.nps.gov/grca/learn/news/2011-02-28_arch_day.htm

On Saturday, March 24, 2012, Grand Canyon National Park will host its 5th annual Archeology Day in honor of Arizona Archaeology and Heritage Awareness Month. https://www.nps.gov/grca/learn/news/2012-02-24_arch-day.htm

On June 23rd, 2013, Grand Canyon National Park will host “President Theodore Roosevelt Salutes the National Park Service.” This special program is a living history portrayal of the 26th President of the United States as performed by Joe Wiegand at 8:30pm, Sunday, June 23rd, 2013 at McKee Amphitheater located on the South Rim behind Park Headquarters near Parking Lot A. https://www.nps.gov/grca/learn/news/grand-canyon-national-park-presents-living-history-performance-of-president-theodore-roosevelt.htm

The importance to society of environmental services, provided by forest ecosystems, has significantly increased during the last few decades. A growing global concern with the deterioration of forests, beginning perhaps most noticeably in the 1980s, has led to an increasing public awareness of the environmental, cultural, economic, and social values that forests provide. Around the world, ideas of sustainable, close-to-nature, and multi-functional forestry have progressively replaced the older perception of forests as only a source for timber. The international impetus to protect and sustainably manage forests has come from global initiatives at management, conservation, and sustainable development related to all types of forests and forestry. A few of the more notable initiatives include: the 1992 Earth Summit in Rio de Janeiro, Brazil (United Nations Conference on Environment and Development, UNCED); regional follow-ups to the Earth Summit such as the Montreal Process and Helsinki Accords; the forest elements of the Convention on Biological Diversity (CBD); and the Framework Convention on Climate Change (FCCC).

But some experts say author Shinichi Mochizuki failed to fix a fatal flaw in the solution of a major arithmetic problem

-- Read more on ScientificAmerican.com

Perron-Frobenius theorem and linear algebra have many virtues to extol

-- Read more on ScientificAmerican.com

We prove a Marstrand type slicing theorem for the subsets of the integer square lattice. This problem is the dual of the corresponding projection theorem, which was considered by Glasscock, and Lima and Moreira, with the mass and counting dimensions applied to subsets of $mathbb{Z}^{d}$. In this paper, more generally we deal with a subset of the plane that is $1$ separated, and the result for subsets of the integer lattice follow as a special case. We show that the natural slicing question in this setting is true with the mass dimension.

In this paper we collect some open set-theoretic problems that appear in the large-scale topology (called also Asymptology). In particular we ask problems about critical cardinalities of some special (large, indiscrete, inseparated) coarse structures on $omega$, about the interplay between properties of a coarse space and its Higson corona, about some special ultrafilters ($T$-points and cellular $T$-points) related to finitary coarse structures on $omega$, about partitions of coarse spaces into thin pieces, and also about coarse groups having some extremal properties.

Connections between set theoretic Yang-Baxter and reflection equations and quantum integrable systems are investigated. We show that set theoretic $R$-matrices are expressed as twists of known solutions. We then focus on reflection and twisted algebras and we derive the associated defining algebra relations for $R$-matrices being Baxterized solutions of the $A$-type Hecke algebra ${cal H}_N(q=1)$. We show in the case of the reflection algebra that there exists a "boundary" finite sub-algebra for some special choice of "boundary" elements of the $B$-type Hecke algebra ${cal B}_N(q=1, Q)$. We also show the key proposition that the associated double row transfer matrix is essentially expressed in terms of the elements of the $B$-type Hecke algebra. This is one of the fundamental results of this investigation together with the proof of the duality between the boundary finite subalgebra and the $B$-type Hecke algebra. These are universal statements that largely generalize previous relevant findings, and also allow the investigation of the symmetries of the double row transfer matrix.

We examine Chern-Simons theory as a deformation of a 3-dimensional BF theory that is partially holomorphic and partially topological. In particular, we introduce a novel gauge that leads naturally to a one-loop exact quantization of this BF theory and Chern-Simons theory. This approach illuminates several important features of Chern-Simons theory, notably the bulk-boundary correspondence of Chern-Simons theory with chiral WZW theory. In addition to rigorously constructing the theory, we also explain how it applies to a large class of closely related 3-dimensional theories and some of the consequences for factorization algebras of observables.

This work has been motivated by recent papers that quantify the density of values of generic quadratic forms and other polynomials at integer points, in particular ones that use Rogers' second moment estimates. In this paper we establish such results in a very general framework. Namely, given any subhomogeneous function (a notion to be defined) $f: mathbb{R}^n o mathbb{R}$, we derive a necessary and sufficient condition on the approximating function $psi$ for guaranteeing that a generic element $fcirc g$ in the $G$-orbit of $f$ is $psi$-approximable; that is, $|fcirc g(mathbf{v})| le psi(|mathbf{v}|)$ for infinitely many $mathbf{v} in mathbb{Z}^n$. We also deduce a sufficient condition in the case of uniform approximation. Here, $G$ can be any closed subgroup of $operatorname{ASL}_n(mathbb{R})$ satisfying certain axioms that allow for the use of Rogers-type estimates.

Let $Gamma subset operatorname{PU}(1,n)$ be a lattice, and $S_Gamma$ the associated ball quotient. We prove that, if $S_Gamma$ contains infinitely many maximal totally geodesic subvarieties, then $Gamma$ is arithmetic. We also prove an Ax-Schanuel Conjecture for $S_Gamma$, similar to the one recently proven by Mok, Pila and Tsimerman. One of the main ingredients in the proofs is to realise $S_Gamma$ inside a period domain for polarised integral variations of Hodge structures and interpret totally geodesic subvarieties as unlikely intersections.

We construct a smooth moduli stack of tuples consisting of genus two nodal curves, line bundles, and twisted fields. It leads to a desingularization of the moduli of genus two stable maps to projective spaces. The construction of this new moduli is based on systematical application of the theory of stacks with twisted fields (STF), which has its prototype appeared in arXiv:1906.10527 and arXiv:1201.2427 and is fully developed in this article. The results of this article are the second step of a series of works toward the resolutions of the moduli of stable maps of higher genera.